• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a method (300) for determining at least one property of a synchronisation system in a transmission. The method comprises the step of providing (s310) a model, wherein the model can provide output data relating to said at least one property of the synchronisation system based on input data relating to at least two parameters of the transmission and/or a potential platform which comprises the transmission. The method (300) comprises determining (s320) data relating to at least two parameters of the transmission and/or the potential platform which comprises the transmission; and determining (s330) said at least one property of the synchronisation system in a transmission based on said model and based on said data relating to at least two parameters of the transmission and/or the potential platform which comprises the transmission. The present invention also relates to a system, a computer program, and a computer program product.
    公开号:SE1551090A1
    申请号:SE1551090
    申请日:2015-08-24
    公开日:2017-02-25
    发明作者:Häggström Daniel
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    1 Method and system for determining a property of a synchronisation system in a transmission TECHNICAL FIELD The present invention re|ates to a method and a system for determining at least one propertyof a synchronisation system in a transmission. The present invention also re|ates to a vehicle, acomputer program, and a computer program product. The present invention also re|ates to a method for providing a model.
    BACKGROUND ART Synchronisation systems are often an important part of a transmission, especially for a vehicletransmission. Synchronisation systems can be used to prevent parts of a transmission toengage unless their speed ratio is such that there is no risk of damaging the transmission. Thisis usually done by accelerating or braking a subsystem of a gearbox during gear change. Due totheir functioning, synchronisation systems can be exposed to a large amount of heat transfer.This can drastically increase the temperature of a synchronisation system or a part thereofduring a short time period. |fthe temperature of a synchronisation system or a part thereofgets too high the synchronisation system can be damaged. lt thus has to be assured to keepthe temperature of a synchronisation system or a part thereof below a certain threshold value.
    This is usually assured by determining a brake energy which has to be provided by thesynchronisation system during a brake procedure. The brake energy can then be divided by anarea ofthe synchronisation system, for example an active area which is used to provide theacceleration or braking effect. ln such a way the heat transfer to the synchronisation system or a part thereof can be determined.
    An alternative way of determining the heat transfer is to look at the power instead of the brake energy.
    SUMMARY OF THE INVENTION Although the above named methods somehow prevent synchronisation system from beingdamaged, synchronisation systems are still one of the components which sometimes have to be replaced. There is thus a need to increase the life time of synchronisation systems. lt has turned out that the above named methods comprise too much averaging whencalculating a heat transfer. ln one example, by averaging over the active area it might bemissed that there are hot spots which could have a higher temperature than the averagetemperature. Another averaging is time, where the transferred heat might not be transferredat an equal rate during the synchronising period. Even other effects might be averaged on,although they in practice might have peaks which could cause damages in the synchronisation system.
    A further drawback of the above named methods is that they not rely on history. When gearchanges are performed shortly after each other the temperature in the synchronisationsystem might not have decreased enough such that an acceptable average temperature isreached. A new round of heat transfer from a new gear shift shortly after a previous gear shiftmight then add up to a higher total temperature than expected, leading to potential damagesin the synchronisation system. Even the history during one cycle is not considered. As anexample, the above named methods take no regard to what has happened e.g. 10 milliseconds ago in the synchronisation period. lt is thus an object ofthe invention to provide an improved method, system, vehiclecomprising the system, computer program, and computer program product for determining at least one property of a synchronisation system in a transmission. lt is further an object of the invention to provide an alternative method, system, vehiclecomprising the system, computer program, and computer program product for determining at least one property of a synchronisation system in a transmission. lt is further an object of the invention to provide a method, a system, a computer program, avehicle comprising the system, and a computer program product for determining at least oneproperty of a synchronisation system in a transmission which alleviates the above named problems. 3Further objects and advantages of the invention might appear at other parts of the description as well as through exercising of the present invention.
    At least some of the objects are achieved by a method for determining at least one property ofa synchronisation system in a transmission. The method comprises the step of providing amodel, wherein the model can provide output data relating to said at least one property of thesynchronisation system based on input data relating to at least two parameters of thetransmission and/or a potential platform which comprises the transmission. The methodfurther comprises determining data relating to at least two parameters of the transmissionand/or the potential platform which comprises the transmission; and determining said at leastone property ofthe synchronisation system in a transmission based on said model and basedon said data relating to at least two parameters of the transmission and/or the potential platform which comprises the transmission.
    Such a method has the advantage that unjustified averaging can be avoided when determiningthe at least one property ofthe synchronisation system. This has the advantage that damagesofthe synchronisation system can be avoided or at least reduced. lt also has the advantagethat security margins can better be adapted to real conditions. Security margins can thus be lowered, which leads to both improved performance and/or the savings in materials. ln one example, the determined at least one property ofthe synchronisation system in thetransmission comprises a property that relates to a temperature or a temperature increase ofthe synchronisation system or a part thereof, or relates to a heat energy transferred to asynchronisation system or a part thereof. Hereby some of the most frequent causes fordamages of synchronisation systems can be monitored. When the temperature of parts of thesynchronisation system, for example, can be kept below a melting point of that material, damages due to melting can be avoided. ln one example, said model is a model of the synchronisation system or at least parts ofthe synchronisation system. ln one example, said data relating to at least two parameters ofthe transmission and/or apotential platform which comprises the transmission comprises at least two parameters out of a first set consisting of a speed of a main shaft and/or a layshaft, a gear ratio in the 4 transmission which should be reached with the help of the synchronisation system, a forceacting on the synchronisation system, preferably an axial force acting on the synchronisationsystem, an inertia relating to a cogwheel which is to be synchronised, an acceleration relatingto said potential platform, and a drag torque. Hereby the most important parameters causingtemperature changes and/or synchronisation time are considered. These parameters allow an especially good determination of the at least one property of the synchronisation system. ln one example, the determining of said at least one property of the synchronisation system isperformed substantially in real-time. ln one example, the method is started at or close to theinitiation of a gear change. ln one example, the method further comprises the step of decidingwhether a gear change should be prevented based on said determined at least one propertyofthe synchronisation system in a transmission. Any of these examples allow preventingpotentially damaging gear changes. This might reduce service costs and increase the lifetime of the constituent components.
    At least some of the objects are achieved by a method for providing a model, wherein themodel can provide output data relating to at least one property of a synchronisation system ina transmission based on input data relating to at least two parameters of the transmissionand/or a potential platform which comprises the transmission. The method comprises the stepof providing a calculation model, preferably based on the so-called finite element method. Themethod further comprises the step of performing a set of simulations on the calculationmodel, said set of simulations preferably comprising several different values for at least twoparameters out of said first set. The method further comprises creating an interpolationfunction for determining said at least one property ofthe synchronisation system in the transmission for basically any possible input data relating to said at least two parameters.
    This allows constructing a model which can predict a property of the synchronisation systembased on parameters of the transmission. The provided model can be installed in a controlunit for controlling a synchronisation system. Thus, such a model helps better predictingproperties ofthe synchronisation system, which can be used to have better knowledge ofthesynchronisation system, thus allowing for better methods for controlling the synchronisation system. 5 ln one example, the method further comprises the step of interpolating at least one propertyofthe synchronisation system based on measured data; and comparing the interpolated atleast one property ofthe synchronisation system based on measured data with theinterpolation function for determining said at least one property of the synchronisationsystem. This allows validating the model with real measurements, thus further improving the model.
    At least some of the objects are achieved by a system for determining at least one property ofa synchronisation system in a transmission. The system comprises means for providing amodel, wherein the model can provide output data relating to said at least one property of thesynchronisation system based on input data relating to at least two parameters of thetransmission and/or a potential platform which comprises the transmission. The systemfurther comprises means for determining data relating to at least two parameters of thetransmission and/or the potential platform which comprises the transmission. The systemfurther comprises means for determining said at least one property of the synchronisationsystem in a transmission based on said model and based on said data relating to at least twoparameters ofthe transmission and/or the potential platform which comprises the transmission. ln one embodiment, the determined at least one property ofthe synchronisation system inthe transmission comprises a property relating to a temperature or a temperature increase ofthe synchronisation system or a part thereof, or relating to a heat energy transferred to a synchronisation system or a part thereof. ln one embodiment, said model is a model of the synchronisation system or at least parts of the synchronisation system. ln one embodiment, said data relating to at least two parameters ofthe transmission and/or apotential platform which comprises the transmission comprises at least two parameters out ofa first set consisting of a speed of a main shaft and/or a layshaft, a gear ratio in thetransmission which should be reached with the help of the synchronisation system, a forceacting on the synchronisation system, preferably an axial force acting on the synchronisationsystem, an inertia relating to a cogwheel which is to be synchronised, an acceleration relating to said potential platform, and a drag torque. 6ln one embodiment, the means for determining said at least one property of thesynchronisation system is arranged to perform said determining of said at least one property ofthe synchronisation system substantially in real-time. ln one embodiment, the system is arranged to start the determination of said at least oneproperty ofthe synchronisation system in the transmission at or close to the start of a gear change. ln one embodiment, the system further comprises means for determining whether a gearchange should be prevented based on said determined at least one property of the synchronisation system in the transmission.
    At least some of the objects are achieved by a vehicle. The vehicle comprises a transmission.The vehicle is arranged to be provided with at least one property of a synchronisation systemin the transmission. Said at least one property of the synchronisation system in the transmission is determined by a system according to the invention.
    At least some of the objects are achieved by a computer program for determining at least oneproperty of a synchronisation system in a transmission. Said computer program comprisesprogram code for causing an electronic control unit or a computer connected to the electronic control unit to perform the steps according to a method of the invention.
    At least some of the objects are achieved by a computer program product containing aprogram code stored on a computer-readable medium for performing method steps accordingto any ofthe methods according to the invention, when said computer program is run on an electronic control unit or a computer connected to the electronic control unit.
    Further objects, advantages and novel features of the present invention will become apparentto one skilled in the art from the following details, and also by putting the invention intopractice. Whereas the invention is described below, it should be noted that it is not confinedto the specific details described. One skilled in the art having access to the teachings hereinwill recognise further applications, modifications and incorporations in other fields, which are within the scope ofthe invention.
    BRIEF DESCRIPTION OF THE DRAWINGS 7For a more detailed understanding ofthe present invention and its objects and advantages,reference is made to the following detailed description which should be read together withthe accompanying drawings. Same reference numbers refer to same components in the different figures. ln the following, Fig. 1 shows, in a schematic way, a vehicle according to one embodiment of the present invention; Fig. 2a shows, in a schematic way, a system according to one embodiment of the present invention;Fig. 2b shows an example of a synchronisation system; Fig. 3a shows, in a schematic way, a flow chart over an example of a method according to the present invention; Fig. 3b shows, in a schematic way, a more detailed flow chart over an example of a method according to the present invention; Fig. 3c shows, in a schematic way, a flow chart over a method according to the present invention; and Fig. 4 shows, in a schematic way, a device which can be used in connection with the present invention.
    DETAILED DESCRIPTION Fig. 1 shows a side view of a vehicle 100. ln the shown example, the vehicle comprises atractor unit 110 and a trailer unit 112. The vehicle 100 can be a heavy vehicle such as a truck.ln one example, no trailer unit is connected to the vehicle 100. The vehicle 100 comprises atransmission 210, se Fig. 2a. The transmission 210 can be arranged in the tractor unit 110. lnone example, the vehicle 100 comprises an internal combustion engine (not shown). The vehicle can further comprise a system 299, se Fig. 2a. ln one example, the vehicle 100 is a bus. The vehicle 100 can be any kind of vehicle comprising a transmission. Other examples of vehicles comprising transmissions are boats, passenger 8cars, construction vehicles, and locomotives. The present invention can also be used inconnection with any other platform than vehicles, as long as such a platform comprises a transmission.
    The innovative method and the innovative system according to one aspect of the inventionare also well suited to, for example, systems which comprise industrial engines and/or engine- powered industrial robots.
    The term ”link” refers herein to a communication link which may be a physical connectionsuch as an opto-electronic communication line, or a non-physical connection such as a wireless connection, e.g. a radio link or microwave link. ln Fig. 2, a system 299 is depicted. The system comprises a transmission 210. The transmission210 can be of any kind. ln one example, the transmission 210 is a manual transmission, MT. ln one example, the transmission 210 is a so-called automated manual transmission, AI/|T.
    The transmission is connected to a combustion engine 230. The combustion engine 230 is an internal combustion engine, e.g. a diesel engine, a gas engine, or a petrol-operated engine.
    The connection between the combustion engine 230 and the transmission 210 comprises afirst main shaft. .The first main shaft is an input shaft 251 of the transmission 210. lt should beunderstood that further components can be comprised in said connection between thecombustion engine 230 and the transmission 210. Examples of such further components are clutches or further shafts.
    The system 299 comprises a second main shaft. The second main shaft is an output shaft 252of the transmission. The system 299 further comprises means 240 for transferring rotationalmotion of the output shaft 252 into a motion of the vehicle 100. Said means 240 fortransferring rotational motion can comprise further shafts or axes, differential gears, further transmissions, wheels, propellers, or the like.
    The transmission 210 comprises a layshaft 253. Said layshaft 253 is connected to the inputshaft 251 (not shown). Said layshaft is connected to the output shaft 252. Said connectionbetween the layshaft 253 and the input and/or the output shaft 251, 252 comprisescogwheels. Said cogwheels comprise a pair of cogwheels, comprising a first cogwheel 270 and a second cogwheel 271. ln one example, the first cogwheel 270 is arranged at the layshaft 253. 9ln one example, the second cogwheel 271 is arranged at the input or the output shaft251, 252(not shown). The pair of cogwheels 270, 271 is arranged to provide a gear in the transmission.The gear has a specific gear ratio. lt should be understood that the transmission 210 cancomprise more cogwheels. ln the following, the principle of the present invention will only beexplained for one pair of cogwheels, representing one gear and one gear ratio. lt is, however,known that more cogwheels can be used to provide several gears, where said several gearscan have several gear ratios. The principle of the present invention can thus easily betransferred to several gears or gear pairs. lt should also be understood, that the first andsecond cogwheels 270, 271 do not necessarily need to mesh directly with each other. |nsteadone or several intermediate cogwheels could be arranged in between said first and said second cogwheel 270, 271. ln one example of the transmission 210, the layshaft 253 and the output shaft 252 are thesame element (not shown). The transmission 210 comprises a synchronisation system 220.The synchronisation system will be explained in more detail in relation to Fig. 2b. ln oneexample, the synchronisation system comprises a synchroniser. ln one example, thesynchronisation system comprises a braking unit. ln the following, the invention will bedescribed with relation to synchronisers. lt should, however, be understood that what isdescribed in the following equally well applies to a brake system in a synchronisation system.Such a brake system of a synchronisation system can comprise brakes. Said brakes can act onat least one shaft of the transmission, such as, for example, the layshaft 253. However, evenother shafts can be braked by the braking unit. A synchroniser is usually arranged to brake acogwheel relative to a shaft. A brake system is usually arranged to brake a shaft relative toground. The term ground relates in one example to a housing of the transmission and/or theengine. A braking unit can be arranged to brake several shafts. Said brake system cancomprise at least one multi-disc brake. What is described in the following regardingsynchroniser can thus equally well be applied to a multi-disc brake, or a part thereof, such as a brake disc.
    The synchroniser 220 comprises a shift sleeve 221, a driver 222, a wire spring 223, a latch cone224, an inner cone 225, and/or a coupling disc 226. The shown synchroniser 220 in Fig. 2b is asingle cone synchroniser. Although the following description will mainly focus on single cone synchronisers it should be understood, that the present invention works as well for other kinds of synchronisers, such as double cone synchronisers or triple cone synchronisers.Further, the synchroniser of Fig. 2b is only an example of a single cone synchroniser 220 forexplaining the principle of the invention. Many different variants of single cone synchronisersare known, and the invention can be used without restriction to the shown embodiment of a synchroniser in Fig. 2b.
    The system 299 further comprises an oil reservoir 290. Said oil reservoir 290 is arranged toprovide a storage space for oil which is used in the transmission 210. ln one example, said oil isused in the synchroniser 220. The oil reservoir 290 can be part of the transmission 210 or beplaced outside the transmission 210 (not shown). Said system 299 is arranged so that said oilis used for providing a cooling function and/or a friction minimising function for thesynchroniser 220. The system might thus be equipped with conduits (not shown) for transporting the oil between the oil reservoir 290 and the synchroniser 220 and back.
    The synchroniser 220 is arranged to synchronize the rotational speed of cogwheels and/orshafts during gear changes. The synchroniser 220 is arranged to block cogwheel engagementduring unsynchronised rotational speed of cogwheels and/or shafts. The synchroniser 220 is arranged to rotationally lock selected cogwheels to a shaft.
    As an example, when driving on a flat road, the speed of the output shaft of a transmissioncan be considered constant during a gear change. For a gear change, from e.g. gear 2 to 3 of amain gearbox in the transmission 210, without any splitter or range change present, therotational speed of the engine 230 is decreased. This means that there is a mismatch betweenthe rotational speed ofthe input shaft 251 and the output shaft 252. Therefore, the third gearsynchroniser has to change the rotational speed of the layshaft 253 and its meshing gears as well as the input shaft 251 to the transmission 210 and a possible clutch disc.
    As an example, the driver 222 is mounted on the input or the output shaft 251, 252. Thecoupling disc 226, or another coupling arrangement, is mounted on a cogwheel. The latchcone 224 has a friction lining on the inside. During synchronisation, this friction lining slidesagainst a mating surface on the inner cone 225. ln one example, the wire spring 223 has to becompressed to move past synchronisation position, which halts a manoeuvring to allow for anoil to be evacuated. This effect is called pre-synchronisation, and ensures that the latch cone 224 blocks cogwheel engagement during the start of a synchronisation process. 11The system 299 further comprises a pedal unit 280. Said pedal unit 280 is arranged to providesignals for controlling the speed of the engine 230. Said pedal unit 280 is arranged to providesignals for controlling a brake of the vehicle 100. Said pedal unit 280 is arranged to providesignals for controlling a clutch (not shown). Said pedal unit 280 comprises one or several pedals, such as two or three pedals.
    The system 299 further comprises an input unit 285. Said input unit 285 is arranged to receivecommands from a driver of a vehicle regarding gear changes. Said input unit 285 can comprisea gear lever. Said input unit 285 can comprise buttons or other input means for receiving commands regarding a gear change.
    Said system 299 comprises a first control unit 200. Said first control unit 200 is arranged tocontrol the transmission 210. Said first control unit 200 is arranged for communication withsaid transmission 210 via a link L210. Hereby said first control unit 200 is arranged to controlspecific components comprised in the transmission 210. ln one example said first control unit 200 is arranged to control the synchroniser 220.
    Said first control unit 200 can also be arranged to control further components of the vehicle, such as the engine 230.
    Said system 299 comprises first sensing means 261. Said first sensing means 261 are arrangedto determine a rotational speed of the input shaft 251. Said first sensing means 261 are arranged to communicate said determined rotational speed of the input shaft 251.
    Said first control unit 200 is arranged to control operation of said first sensing means 261. Saidfirst control unit 200 is arranged for communication with said first sensing means 261 via a linkL261. Said first control unit 200 is arranged to receive information from said first sensing means 261.
    Said system 299 comprises second sensing means 262. Said second sensing means 262 arearranged to determine a rotational speed of the output shaft 252. Said second sensing means 262 are arranged to communicate said determined rotational speed of the output shaft 252.
    Said first control unit 200 is arranged to control operation of said second sensing means 262.
    Said first control unit 200 is arranged for communication with said second sensing means 262 12via a link L262. Said first control unit 200 is arranged to receive information from said second sensing means 262.
    Said system 299 comprises third sensing means 263. Said third sensing means 263 arearranged to determine a rotationa| speed ofthe layshaft 253. Said third sensing means 263 are arranged to communicate said determined rotationa| speed of the layshaft 253.
    Said first control unit 200 is arranged to control operation of said third sensing means 263.Said first control unit 200 is arranged for communication with said third sensing means 263 viaa link L263. Said first control unit 200 is arranged to receive information from said third sensing means 263.
    Said system 299 comprises fourth sensing means 264. Said fourth sensing means 264 arearranged to determine information regarding the inertia of the first cogwheel 270. The terminertia can relate to the moment of inertia. ln one example, said fourth sensing means 264 arearranged to determine information regarding the angular velocity of the first cogwheel 270.Said fourth sensing means 264 are arranged to communicate said determined information regarding the inertia of the first cogwheel 270.
    Said first control unit 200 is arranged to control operation of said fourth sensing means 264.Said first control unit 200 is arranged for communication with said fourth sensing means 264via a link L264. Said first control unit 200 is arranged to receive information from said fourth sensing means 264.
    Said system 299 comprises fifth sensing means 265. Said fifth sensing means 265 are arrangedto determine information regarding the inertia of the second cogwheel 271. The term inertiacan relate to the moment of inertia. ln one example, said fifth sensing means 265 are arrangedto determine information regarding the angular velocity ofthe second cogwheel 271. Said fifthsensing means 265 are arranged to communicate said determined information regarding the inertia ofthe second cogwheel 271.
    Said first control unit 200 is arranged to control operation of said fifth sensing means 265. Saidfirst control unit 200 is arranged for communication with said fifth sensing means 265 via alink L265. Said first control unit 200 is arranged to receive information from said fifth sensing means 265. 13Said system 299 comprises sixth sensing means 266. Said sixth sensing means 266 arearranged to determine a force on the synchroniser 266. Said force can be an axial force on thesynchroniser 220. Said sixth sensing means 266 are arranged to communicate said force on the synchroniser 220.
    Said first control unit 200 is arranged to control operation of said sixth sensing means 266.Said first control unit 200 is arranged for communication with said sixth sensing means 266 viaa link L266. Said first control unit 200 is arranged to receive information from said sixth sensing means 266.
    Said system 299 comprises seventh sensing means 267. Said seventh sensing means 267 arearranged to determine an acceleration of the vehicle 100. ln one example, that is performedby determining an acceleration of one or several wheels of the vehicle 100. Said seventhsensing means 267 are arranged to communicate said determined acceleration of the vehicle 100.
    Said first control unit 200 is arranged to control operation of said seventh sensing means 267.Said first control unit 200 is arranged for communication with said seventh sensing means 267via a link L267. Said first control unit 200 is arranged to receive information from said seventh sensing means 267.
    Said system 299 comprises eighth sensing means 268. Said eighth sensing means 268 arearranged to determine at least one command given to the pedal unit 280. Said at least onecommand can relate to the fact whether one or several pedals of the pedal unit 280 aredepressed or not. Said at least one command can relate to the fact how much one or severalpedals of the pedal unit 280 are depressed. Said at least one command can relate to the facthow fast one or several pedals of the pedal unit 280 are depressed. Said eighth sensing means268 do not necessarily need to be arranged close to the pedal unit 280. Actions on the pedalunit 280, corresponding to a command given to the pedal unit 280, can be physicallytransmitted to other parts of the vehicle 100, for example via hydraulic pressure. lt is thuspossible to measure actions on the pedal unit 100 at other places than close to the pedal unit280. Said eighth sensing means 268 are arranged to communicate said determined at least one command given to the pedal unit 280. 14Said first control unit 200 is arranged to control operation of said eighth sensing means 268.Said first control unit 200 is arranged for communication with said eighth sensing means 268via a link L268. Said first control unit 200 is arranged to receive information from said eighth sensing means 268.
    Said system 299 comprises ninth sensing means 269. Said ninth sensing means 269 arearranged to determine at least one command given to the input unit 285. Said at least onecommand can relate to the fact whether a gear should be changed. Said at least one commandcan relate to the fact into which gear a gear change should be performed. Said ninth sensingmeans 269 are arranged to communicate said determined at least one command given to the input unit 285.
    Said first control unit 200 is arranged to control operation of said ninth sensing means 269.Said first control unit 200 is arranged for communication with said ninth sensing means 269via a link L269. Said first control unit 200 is arranged to receive information from said ninth sensing means 269.
    Said system 299 comprises tenth sensing means 260. Said tenth sensing means 260 arearranged to determine data relating to a drag torque of a part of the system 299. ln oneexample, said part is the synchroniser 220. Said data relating to the drag torque can be atemperature of the oil. ln one example, said tenth sensing means 260 are arranged at or closeto the oil reservoir 290 for determining a temperature of the oil. From the oil temperature it ispossible to derive information regarding the drag torque. The reason for that is that the dragtorque is basically linear to a viscosity of a given oil, at least in certain intervals. Said viscositycan be determined from the temperature of the oil. ln one example, said tenth sensing meansare arranged close to a pipe transporting oil between the oil reservoir 290 and thesynchroniser 220. ln one example said tenth sensing means 260 are placed at or close to thesynchroniser 220 for measuring the oil temperature at the synchroniser 220. lt is possible toderive the oil temperature in the synchroniser 220 based on the oil temperature in the oilreservoir 290. This can, for example, be done if properties such as amount of oil, flowingspeed of the oil between reservoir and synchroniser, or geometrical properties regarding oil reservoir 290, synchroniser 220, and/or pipes in between are known or measured. Said tenth sensing means 260 are arranged to communicate said determined data relating to the drag torque.
    Said first control unit 200 is arranged to control operation of said tenth sensing means 260.Said first control unit 200 is arranged for communication with said tenth sensing means 260via a link L260. Said first control unit 200 is arranged to receive information from said tenth sensing means 260.
    The aforementioned sensing means are examples of sensing means which can be used inconnection with the present invention. The system 200 can comprise further sensing meanswhich are not shown in Fig. 2a. Examples of such further sensing means are sensing means fordetermining a driving resistance, sensing means for determining a slope of a potential track onwhich the vehicle is driving, or the like. The first control unit 200 is then arranged to controloperation of said further sensing means. Said first control unit 200 is then arranged forcommunication with said further sensing means via a link. Said first control unit 200 is then arranged to receive information from said further sensing means.
    Said first control unit 200 can be arranged to provide a model, wherein the model providesoutput data relating to at least one property of the synchroniser 220 based on input datarelating to at least two parameters of the transmission 210 and/or a potential platform 100which comprises the transmission 210. The model can be a synchroniser model or a model ofparts of the synchroniser, such as any or several of the components 221-226. ln one example,the model is only about sections of parts of the synchroniser 220. As can be seen in Fig. 2b, thesynchroniser 220 can have some degree of symmetry or at least approximate symmetry inparts 221-226 of the synchroniser 220. lt might thus be enough to not model all of thesynchroniser and use symmetry considerations for achieving results regarding the wholesynchroniser, or at least for whole parts 221-226 of the synchroniser. I/|ore details of themodel will be described later on. Said at least one property of the synchroniser 220 can relateto a temperature of the synchroniser or a temperature increase of the synchroniser 220 or apart thereof 221-226. Said at least one property of the synchroniser can relate to a heat energy transferred to the synchroniser 220 or a part thereof 221-226. ln one example, said first control unit 200 provides said model in whole or in part via a look-up table. A relation between possible inputs and the corresponding outputs could thus have been 16pre-calculated and then stored in the first control unit 200. The first control unit 200 is thenarranged to use data which it has received from any of the sensing means 260-269 for lookingup output data of the model. The first control unit 200 can also be arranged to process datawhich it has received from any of the sensing means 260-269 before looking up output data ofthe model. ln one example, the first control unit 200 provides said model in whole or in partvia one or several mathematical functions. Said first control unit 200 is then arranged tocalculate an output of said one or several mathematical functions based on input data, such as those data received from any of the sensing means 260-269.
    Said first control unit 200 is thus arranged for determining at least one property of thesynchroniser 220 in the transmission 210 based on said model and based on data relating to atleast two parameters of the transmission 210 and/or the potential platform 100 which comprises the transmission 210. ln one example, the first control unit 200 is arranged to perform the determining of the atleast one property of the synchroniser substantially in real-time. Hereby, the termsubstantially real-time refers to the fact that the first control unit 200 performs thedetermining of the at least one property of the synchroniser faster than a time-period of said first control unit 200 for determining whether a gear change should be allowed or not. ln one example, the system 299 is arranged to start the determination of said at least oneproperty of the synchroniser 220 in the transmission 210 at or close to the start of a gearchange. ln one example, the first control unit 200 is arranged to determine said at least oneproperty when a gear change is indicated by said eight sensing means 268 and/or by said ninthsensing means 269. As an example, the wish of a driver to perform a gear change can bedetected via a pedal from said pedal unit 280 or via some command on said input unit 285.The term ”close to” relates to a pre-determined time period after the start of a gear change.This time period can for example be 0.1 seconds, 0.5 seconds, 1 second, 5 seconds, or 10 seconds.
    The first control unit 200 is arranged to allow or to not allow a gear change in the transmission210. For that, the first control unit 200 can be arranged for deciding whether a gear changeshould be prevented based on the determined at least one property of the synchroniser 220 in the transmission 210. 17The system 299 is arranged to store data, for example in the first control unit 200. Said storeddata can be data provided by the sensing means 260-269. Said stored data can be the inputdata of the model. Said stored data can be the output data of the model and/or thedetermined at least on property of the synchroniser 220. Thus, in one example, the system299 is arranged to store a synchronisation time and/or a temperature increase in the synchroniser 220.
    Said first control unit 200 is arranged to store pre-determined values. Examples of such pre-determined values are a vehicle mass, an inertia, such as a moment of inertia and/or a mass ofinertia of one or several cogwheels, such as the first and/or second cogwheel 270, 271, and/orthe gear ratio of one or several gears. Preferably, said stored pre-determined values are valueswhich are not expected to change significantly during the operation of a potential platformwhich comprises the transmission. Said stored pre-determined values can also be values,where a change of these values during the operation of a potential platform which comprisesthe transmission will not significantly contribute to a change in the output of the model. The stored pre-determined values can be used as input parameters to the model.
    A second control unit 205 is arranged for communication with the first control unit 200 via alink L205 and may be detachably connected to it. lt may be a control unit external to thevehicle 100. lt may be adapted to conducting the innovative method steps according to theinvention. The second control unit 205 may be arranged to perform the inventive methodsteps according to the invention. lt may be used to cross-load software to the first control unit200, particularly software for conducting the innovative method. lt may alternatively bearranged for communication with the first control unit 200 via an internal network on boardthe vehicle. lt may be adapted to performing substantially the same functions as the firstcontrol unit 200, such as determining at least one property of the synchroniser in thetransmission. The innovative method may be conducted by the first control unit 200 or the second control unit 205, or by both of them. ln the following, methods according to the present invention are described in relation to Fig. 3a-3c.
    Fig. 3a shows, in a schematic way, a flow chart over an example of a method 300 according to the present invention. The method 300 determines at least one property of a synchroniser in a 18transmission. The method 300 starts with step s301. The step s301 comprises providing amodel, wherein the model can provide output data relating to said at least one property of thesynchroniser based on input data relating to at least two parameters of the transmissionand/or a potential platform which comprises the transmission; determining data relating to atleast two parameters of the transmission and/or the potential platform which comprises thetransmission; and determining said at least one property of the synchroniser in a transmissionbased on said model and based on said data relating to at least two parameters of thetransmission and/or the potential platform which comprises the transmission. After step s301 the method ends.
    Fig. 3b shows, in a schematic way, a more detailed flow chart over an example of a method300 according to the present invention. The method is in one example started at or close tothe start of a gear change. There might thus be a step of detecting whether a gear changeshould be started which is performed before the method 300 starts. The method 300 starts with step s310. ln step s310 a model is provided. The provided model can provide output data relating to saidat least one property of the synchroniser based on input data relating to at least two parameters ofthe transmission and/or a potential platform which comprises the transmission.
    The model is a model of the synchroniser or at least parts of the synchroniser. As has beenexplained before, the model can also be about only sections of parts of the synchroniser. Themodel does thus not necessarily have to include the whole synchroniser of whole parts of the synchroniser.
    The determined at least one property of the synchroniser in the transmission comprises aproperty relating to a temperature or a temperature increase of the synchroniser or a partthereof, or relating to a heat energy transferred to a synchroniser or a part thereof. lt will beunderstood that a model relating to at least two parameters of the transmission can alsodetermine other properties relating of the synchroniser. As an example, the model couldprovide output data relating to at least one mechanical force on the synchroniser or partsthereof. ln one example, the model provides output data relating to a synchronisation time in the transmission. 19Said data relating to at least two parameters of the transmission are in one example chosenamong the speed of a main shaft and/or a layshaft, a gear ratio in the transmission whichshould be reached with the help of the synchroniser, a force acting on the synchroniser,preferably an axial force acting on the synchroniser, an inertia relating to a cogwheel which isto be synchronised, an acceleration relating to the potential platform, and/or a drag torque.Depending on the property of the synchroniser which should be determined, even otherparameters might be relevant. The above example can thus easily be extended with further parameters, especially if they contribute to the property of the synchroniser.
    The term ”providing” relates in one example to a method 400 for providing a model, whichwill be described in more detail later on. This is, however, not a prerequisite. The model canbe constructed in any other way as well. One example of another way is to base a model onpurely empirical data. ln one example, the term ”providing” thus just relates to the fact thatsuch a model has been constructed in any possible way. ln one example, the term ”providing”relates to giving access to such a model. The model can, for example, have been constructedbefore the synchroniser is used for the first time. lt is then stored in such a way that a computing unit has access to the model. An example is presented in relation to Fig. 4.After step s310 the method continues with step s320. ln step s320 data relating to at least two parameters of the transmission and/or the potentialplatform which comprises the transmission is determined. This determination is done with thehelp of sensing means. The determination can also be done in any other way, for exampleways including measuring and calculating. The at least two parameters do not have to bedetermined at the same time. Some of the at least two parameters could have beendetermined at an earlier stage. Thus, parts or all of step s320 are in one example performedbefore or during step s310. Some of the at least two parameters could have been determinedto be fixed during several runs of the method 300. Examples of such fixed parameters are avehicle mass, an inertia, such as a moment of inertia and/or a mass of inertia of one or severalcogwheels, and/or a gear ratio of one or several gears. Said fixed parameters can beparameters, where a change of these parameters will not significantly contribute to a changein the output ofthe model. Said fixed parameters can be parameters which are assumed to be constant during several runs of the method.
    After step s320 the method continues with step s330. ln step s330 said at least one property of the synchroniser in a transmission is determinedbased on said model and based on said data relating to at least two parameters of thetransmission and/or the potential platform which comprises the transmission. This is done byusing the data relating to at least two parameters of the transmission and/or the potentialplatform which comprises the transmission as input data to the model. ln one example, theinput data is then used to calculate said at least one property of the synchroniser with thehelp ofthe model. ln one example, the input data is used to look up said at least one propertyof the synchroniser. This is, for example, done ifthe model is provided in the form of a look-up table. After step s330 an optional step s340 is performed. ln the optional step s340 it is decided whether a gear change should be prevented based onsaid determined at least one property of the synchroniser in a transmission. ln one example,the decision is based on a temperature and/or a temperature increase of the synchroniserwhich is expected after the gear change. ln the step s340 it is thus in one example decided toprevent the gear change if the expected temperature and/or the expected temperatureincrease of the synchroniser after the gear change is above a pre-determined threshold. Thegear change is in one example prevented if the expected heat energy transferred to thesynchroniser is above a pre-determined threshold. ln one example, a prevented gear change isreplaced with a different gear change. This is, for example, done if it is considered that thedifferent gear change will not risk damaging the synchroniser. As an example, if it isdetermined that a shift from the second to the fourth gear might damage the synchroniser, ashift from the second to the third might not. |nstead of preventing the gear shift it might also be decided to prevent using the synchroniser for the gear shift.
    Said pre-determined threshold is chosen so as to avoid damaging of the synchroniser and/orthe transmission comprising the synchroniser. ln one example the threshold relates to an inner cone and/or a latch cone of the synchroniser.
    After the optional step s340 the method 300 ends. ln one example, the method is performedin such a way that the determining of said at least one property of the synchroniser isperformed substantially in real-time. The term ”real-time” does not necessarily imply that the determined at least one property of the synchroniser is the property of the current state of 21the synchroniser. ln one example, said at least one property which is determined substantiallyin real-time is a property which the synchroniser will possess after a pre-determined time period or after a certain action, such as a gear shift, is performed.The method 300 can be run repeatedly.
    Fig. 3c shows, in a schematic way, a flow chart over a method 400 according to the presentinvention. Said method 400 provides a model, wherein the model can provide output datarelating to at least one property of a synchroniser in a transmission based on input datarelating to at least two parameters of the transmission and/or a potential platform whichcomprises the transmission. ln one example, said method corresponds to step 310 of method300. ln another example, said method 400 is used independently of method 300. Said methodcan be provided partly or fully independently for different kinds of synchronisers, such as for single-cone, double-cone and triple-cone synchronisers.
    The method 400 starts with the step s410 of providing a calculation model, preferably basedon the so-called finite element method, FE-method. Said calculation model can be acalculation model of the synchroniser, or of parts of the synchroniser. Said calculation modelcan be a calculation model of sections of parts of the synchroniser. Said sections can bechosen so as to make use of symmetries in the synchroniser. The FE-model can be amultiphysics FE-model. The FE-model can have finer structures of the FE at areas of parts ofthe synchroniser which are expected to contact areas of other parts of the synchroniser. lnother words, surfaces which will contact each other during operation of the synchroniser andwhich thus will provide a synchronisation function can be modelled in more detail than other structures of the synchroniser. After step s410 a step s420 is performed. ln step s420 a set of simulations is performed on the calculation model. Said set of simulationspreferably comprise several different values for at least two parameters out of a speed of amain shaft and/or a layshaft, a gear ratio in the transmission which should be reached with thehelp of the synchroniser, a force acting on the synchroniser, preferably an axial force acting onthe synchroniser, an inertia relating to a cogwheel which is to be synchronised, an accelerationrelating to said potential platform, and a drag torque. Said set of simulations can also have aforce rate as a parameter. The term force rate relates to an increase ofthe force acting on the synchroniser over time. Said increase is preferably described linearly. Said increase of the 22force is done until a maximum value is reached. This is usually a good description of a pneumatic actuator which is used with the synchroniser 220.
    Preferably, said simulation comprises the relevant maximum and minimum values for saidparameters. For parameters with small and/or linear contribution to the property of the synchroniser it can be enough with one or two data points.
    Parameters with a large and non-linear contribution to the property of the synchroniser ingeneral need several data points. Examples of such parameters are the speed of a main shaft and/or a layshaft and a gear ratio. ln one example, the parameters have four data points for a speed of a main shaft and/or alayshaft, three data points for a force acting on the synchroniser, preferably an axial forceacting on the synchroniser, three data points for a force rate, three data points for an inertiarelating to a cogwheel which is to be synchronised, four plus four data points for a gear ratioin the transmission which should be reached with the help of the synchroniser, where four ofthe data points are for upshifting and four of the data points are for the downshifting, threedata points for an acceleration relating to said potential platform, and two data points for thedrag torque. ln total, this example gives 5184 data points. lt should, however, be noted that agood choice of data points might depend on the design of the transmission and/or thesynchroniser and thus might differ from one kind of synchroniser to another. Especially itmight be useful to run different simulations for single-cone, double-cone and triple-cone synchronisers. After step s420 a step s430 is performed. ln step s430 an interpolation function is created for determining said at least one property ofthe synchroniser in the transmission for basically any possible input data relating to said atleast two parameters. Preferably this is done so as to provide the property of the synchroniser for any combination of input parameters. After step s430 an optional step s440 is performed. ln the optional step s440 at least one property of the synchroniser is interpolated based onmeasured data. This is done via putting the synchroniser in a test arrangement and measuringreal data of the parameters which were used for running the simulation in step s420. The atleast one property of the synchroniser can be measured as well. The test arrangement is in one example the vehicle 100. The number and values of data points for the parameters does 23not have to coincide with the number and values of data points which were used in step s420.Not all parameters have necessarily to be measured. Values which are in one exampleassumed not to change during several runs of a method are a vehicle mass, an inertia, such asa moment of inertia and/or a mass of inertia of one or several cogwheels, and/or the gear ratio of one or several gears. After the optional step s440, an optional step s450 is performed. ln the optional step s450 the interpolated at least one property of the synchroniser based onmeasured data is compared with the interpolation function for determining said at least oneproperty of the synchroniser. lf the comparison shows that the two interpolations are inagreement with each other, the model is in one example assumed to be validated. lf thecomparison shows that the two interpolations are not in agreement with each other, any ofsteps s410, s420, and/or s430. ln one example, during the repetition more data points areused. ln one example, during the repetition further and/or different input parameters are used.
    Said at least one property of the synchroniser based on measured data in step s440 and/orstep s450 does not necessarily have to coincide with said at least one property which theoutput data of the provided model relates to. ln one example, the at least one property whichthe output data of the provided model relates to might comprise two properties, such as atemperature increase and a synchronisation time. The at least one property of thesynchroniser based on measured data in step s440 and/or step s450 does in one example onlyrelate to a measured synchronisation time. ln this example, the model is validated for thesynchronisation time and it is then assumed that the value for the temperature will be a correct value as long as the synchronisation time is validated.After the optional step s450 the method ends.
    A method which is provided according to method 400 is then stored in relation to a vehicle,for example in a first control unit of a vehicle. A method has not to be provided according tomethod 400 for every vehicle separately. lnstead, it might be enough to reuse the providedmethod for similar vehicles. Similar vehicles are in one example vehicles with the sametransmission. lt could be required that further properties of the vehicle are the same or do notdiffer more than a pre-determined threshold for the definition of a similar vehicle. Such further properties are the weight and/or combustion engine of the vehicle. 24 Figure 5 is a diagram of one version of a device 500. The control units 200 and 205 describedwith reference to Figure 2a may in one version comprise the device 500. The device 500comprises a non-volatile memory 520, a data processing unit 510 and a read/write memory550. The non-volatile memory 520 has a first memory element 530 in which a computerprogram, e.g. an operating system, is stored for contro|ing the function of the device 500. Thedevice 500 further comprises a bus controller, a serial communication port, I/O means, an A/Dconverter, a time and date input and transfer unit, an event counter and an interruptioncontroller (not depicted). The non-volatile memory 520 has also a second memory element 540.
    The computer program comprises routines for determining at least one property of a synchroniser in a transmission.
    The computer program P may comprise routines for providing a model, wherein the modelcan provide output data relating to said at least one property of the synchroniser based oninput data relating to at least two parameters of the transmission and/or a potential platform which comprises the transmission.
    The computer program P may comprise routines for determining data relating to at least twoparameters of the transmission and/or the potential platform which comprises thetransmission. This may at least partly be performed by means of said first control unit 200contro|ing operation of at least one of said first to tenth sensing means 260-269. Some of said at least two parameters may be stored in said non-volatile memory 520.
    The computer program P may comprise routines for determining said at least one property ofthe synchroniser in a transmission based on said model and based on said data relating to atleast two parameters of the transmission and/or the potential platform which comprises the transmission.
    The computer program P may comprise routines for deciding whether a gear change shouldbe prevented based on said determined at least one property of the synchroniser in a transmission.
    The program P may be stored in an executable form or in compressed form in a memory 560 and/or in a read/write memory 550.
    Where it is stated that the data processing unit 510 performs a certain function, it means thatit conducts a certain part of the program which is stored in the memory 560 or a certain part of the program which is stored in the read/write memory 550.
    The data processing device 510 can communicate with a data port 599 via a data bus 515. Thenon-volatile memory 520 is intended for communication with the data processing unit 510 viaa data bus 512. The separate memory 560 is intended to communicate with the dataprocessing unit via a data bus 511. The read/write memory 550 is arranged to communicatewith the data processing unit 510 via a data bus 514. The links L205, L210, and L260-L269, for example, may be connected to the data port 599 (see Figure 2a).
    When data are received on the data port 599, they can be stored temporarily in the secondmemory element 540. When input data received have been temporarily stored, the data processing unit 510 can be prepared to conduct code execution as described above.
    Parts of the methods herein described may be conducted by the device 500 by means of thedata processing unit 510 which runs the program stored in the memory 560 or the read/write memory 550. When the device 500 runs the program, methods herein described are executed.
    The foregoing description of the preferred embodiments of the present invention is providedfor i|ustrative and descriptive purposes. lt is not intended to be exhaustive, nor to limit theinvention to the variants described. Many modifications and variations will obviously suggestthemselves to one skilled in the art. The embodiments have been chosen and described inorder to best explain the principles of the invention and their practical applications andthereby make it possible for one skilled in the art to understand the invention for different embodiments and with the various modifications appropriate to the intended use.
    权利要求:
    Claims (8)
    [1] 1. A method (300) for determining at least one property of a synchronisation system ina transmission, the method comprising the steps: - providing (s310) a model, wherein the model can provide output data relatingto said at least one property of the synchronisation system based on input datarelating to at least two parameters of the transmission and/or a potentialplatform which comprises the transmission; - determining (s320) data relating to at least two parameters of the transmissionand/or the potential platform which comprises the transmission; and - determining (s330) said at least one property of the synchronisation system in atransmission based on said model and based on said data relating to at leasttwo parameters of the transmission and/or the potential platform whichcomprises the transmission.
    [2] 2. The method according to claim 1, wherein the determined at least one property ofthe synchronisation system in the transmission comprises a property relating to atemperature or a temperature increase of the synchronisation system or a partthereof, or relating to a heat energy transferred to a synchronisation system or apart thereof.
    [3] 3. The method according to any of the previous claims, wherein said data relating to atleast two parameters of the transmission and/or a potential platform whichcomprises the transmission comprises at least two parameters out of a first setconsisting of a speed of a main shaft and/or a layshaft, a gear ratio in thetransmission which should be reached with the help of the synchronisation system, aforce acting on the synchronisation system, preferably an axial force acting on the synchronisation system, an inertia relating to a cogwheel which is to besynchronised, an acceleration relating to said potential platform, and a drag torque.
    [4] 4. The method according to any ofthe previous claims, wherein the determining of saidat least one property of the synchronisation system is performed substantially in real-time. 27
    [5] 5. The method according to any of the previous claims, further comprising the step (s340) of deciding whether a gear change should be prevented based on said determined at least one property ofthe synchronisation system in a transmission.
    [6] 6. A method for providing a model, wherein the model can provide output data relating to at least one property of a synchronisation system in a transmission based on input data relating to at least two parameters of the transmission and/or a potential platform which comprises the transmission, the method comprising the steps of: providing (s410) a calculation model, preferably based on the so-called finiteelement method; performing (s420) a set of simulations on the calculation model, said set ofsimulations preferably comprising several different values for at least twoparameters out of said first set; creating (s430) an interpolation function for determining said at least oneproperty of the synchronisation system in the transmission for basically any possible input data relating to said at least two parameters.
    [7] 7. The method according to the previous claim, the method further comprising the steps of: interpolating (s440) at least one property of the synchronisation system basedon measured data; and comparing (s450) the interpolated at least one property of the synchronisationsystem based on measured data with the interpolation function for determining said at least one property of the synchronisation system.
    [8] 8. A system (299) for determining at least one property of a synchronisation system (220) in a transmission (210), the system (299) comprising: means (200, 205) for providing a model, wherein the model can provide outputdata relating to said at least one property of the synchronisation system (220)based on input data relating to at least two parameters of the transmission(210) and/or a potential platform (100) which comprises the transmission (210);means (260-269) for determining data relating to at least two parameters ofthe transmission (210) and/or the potential platform (100) which comprises the transmission (210); and 10. 11. 12. 13. 14. 28- means (200, 205) for determining said at least one property of thesynchronisation system (220) in a transmission (210) based on said model andbased on said data relating to at least two parameters of the transmission (210)and/or the potential platform (100) which comprises the transmission (210).The system according to claim 8, wherein the determined at least one property ofthe synchronisation system (220) in the transmission (210) comprises a propertyrelating to a temperature or a temperature increase of the synchronisation system(220) or a part thereof (221-226), or relating to a heat energy transferred to asynchronisation system (220) or a part thereof (221-226).The system according to any of claims 8-9, wherein said data relating to at least twoparameters of the transmission (210) and/or a potential platform (100) whichcomprises the transmission (210) comprises at least two parameters out of a first setconsisting of a speed of a main shaft (251, 252) and/or a layshaft (253), a gear ratioin the transmission (210) which should be reached with the help of thesynchronisation system (220), a force acting on the synchronisation system (220),preferably an axial force acting on the synchronisation system (220), an inertiarelating to a cogwheel (270, 271) which is to be synchronised, an accelerationrelating to said potential platform (100), and a drag torque.The system according to any of claims 8-10, wherein the means (200, 205) fordetermining of said at least one property of the synchronisation system is arrangedto perform said determining of said at least one property of the synchronisationsystem substantially in real-time.The system according to any of claims 8-11, further comprising means (200, 205) fordeciding whether a gear change should be prevented based on said determined atleast one property ofthe synchronisation system (220) in the transmission (210).A vehicle (100) comprising a transmission (210), wherein the vehicle is arranged tobe provided with at least one property of a synchroniser (220) in the transmission(210), wherein said at least one property of the synchronisation system (220) in thetransmission (210) is determined by a system (299) according to any of claims 10-16.A computer program (P) for determining at least one property of a synchronisationsystem (220) in a transmission (210), wherein said computer program (P) comprises program code for causing an electronic control unit (200, 500) or a computer (205; 15. 29500) connected to the electronic control unit (200; 500) to perform the stepsaccording to any of the claims 1-5.A computer program product containing a program code stored on a computer-readable medium for performing method steps according to any of claims 1-5, whensaid computer program is run on an electronic control unit (200; 500) or a computer (205; 500) connected to the electronic control unit (200; 500).
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    同族专利:
    公开号 | 公开日
    SE540607C2|2018-10-02|
    DE102016010065A1|2017-03-02|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1551090A|SE540607C2|2015-08-24|2015-08-24|Method and system for determining a property of a synchronizer in a transmission|SE1551090A| SE540607C2|2015-08-24|2015-08-24|Method and system for determining a property of a synchronizer in a transmission|
    DE102016010065.6A| DE102016010065A1|2015-08-24|2016-08-19|Method and system for determining a property of a synchronization system in a transmission|
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