• 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:
    SUMMARY A method for detecting breakage of a belt (1) arranged in a motor vehicle to be driven by an internal combustion engine (2) and thereby itself drive at least one generator (3) and a cooling water pump (4), the vehicle having means ( 5) designed to determine the state of operation of the generator and transmit a signal in faultless operation of the generator, comprises the step of supplying a parameter to another signal during a period of time which is wholly or partly after the cessation of said means of transmitting said signal. component of the vehicle to the generator whose value depends on whether the belt is intact or interrupted so as to compare whether the belt can be present by comparing the development of the measured value of the parameter Over the said time period with a normal development of this value at full belt.
    公开号:SE1350808A1
    申请号:SE1350808
    申请日:2013-07-01
    公开日:2015-01-02
    发明作者:Holger Dreher；Gunnar Ledfelt；Dan Magnusson；Patrik Jansson
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    2 In the event of a belt breakage of a named motor vehicle, the coolant pump stops, which means that the engine does not cool down. It is then important that the engine stops as soon as possible so that it does not overheat and be damaged. For this reason, it is of utmost importance that belt breakage can be detected when the choice occurs.
    BACKGROUND ART US 2006/0054128 A1 describes a method of initially defined kind for detecting belt breakage, in which the function of the generator driven by the belt is monitored and it is assumed that belt breakage is present when the generator does not function properly. The conclusion drawn there as to the occurrence of belt breakage may in certain circumstances be incorrect.
    It is also possible that when the said means in the vehicle ceases to emit a signal indicating that the generator's function is faultless, light a warning light in the vehicle and introduce a strong torque limitation in the engine to reduce the risk of overheating it before the driver has the opportunity to switch off the engine. It is assumed that there is a belt break when the said signal is no longer sent out, and the vehicle is stopped as soon as possible and is considered to be in a state of emergency repair (VOR = Vehicle Off Road).
    The fact that the generator does not work flawlessly can, however, have other reasons than the occurrence of a belt break, so that these procedures for detecting a belt break can lead to unnecessary stopping of a vehicle. SUMMARY OF THE INVENTION The object of the present invention is to provide a method of initially defined kind, which is improved in at least some respect with respect to prior art such methods.
    This object is achieved according to the invention by providing such a method which has the features of appended claims 1.
    By in the case of non-faulting operation of the generator for a period of time which is wholly or partly after the time of cessation of transmission of said signal, a parameter of another component of the vehicle is fed to the generator whose value depends on whether said belt is whole or interrupted and If the development of the measured value of the parameter aver said time period with a normal development has this value at full belt, it can be reliably determined whether a belt break can really occur in the absence of said signal. Consequently, the follow-up effects of a belt break are examined, and if no such side effect occurs, it is determined that there is also no belt break. In such a case, it is determined that the reason why the generator does not work as it should must be different from the fact that there is a belt break.
    For example, there may have been some electrical fault in the generator, such as in its regulator or in a rectifier bridge, this may result in no or reduced charging of batteries connected to the generator, but in these cases it is excellent to drive the vehicle on only power from the batteries, perhaps for several hours.
    The method according to the invention can thus reduce inconvenient 4 stops of the vehicle by allowing minor travel of the vehicle for a certain period of time in the event of less acute generator problems. If the comparison shows that the development of the measured value over the time period deviates from the normal development, then it is determined that belt breakage may occur and the motor vehicle is handled as if this were the case, ie stop as soon as possible.
    "That said means ceases to transmit said signal" means that there is a continuous cessation of transmission of the signal, ie not that the signal for some reason accidentally falls away and reappears, but when performing steps b) -d) the signal must be permanent disappeared. "If and only if" means that if what follows on this does not apply then it is determined that there can be no belt breakage.
    According to an embodiment of the invention, said parameter is fed continuously during the operation of the motor vehicle and in step c) the measured value of the parameter is compared after the time of said cessation with the obtained value of the parameter at the time of said cessation. As a result, noticeable changes in the value of the parameter in connection with the generator switching to defective function can be detected and it can then be determined that there may be a belt break. If the said value does not change significantly, the occurrence of belt breakage can be ruled out and the motor vehicle can be driven further without an urgent need to stop.
    According to another embodiment of the invention, in step b) said parameter is fed at several times after said cessation and the measured values are compared with each other to determine the development thereof and compare this with said normal development. This embodiment is suitable in the event that a parameter is fed, which will necessarily be different in another way after a belt break than if the belt were intact.
    According to another embodiment of the invention, in step b) a parameter is fed to a bat in the vehicle, which said generator is arranged to charge, in step c) a further comparison of the measured values of said parameter is also performed with a typical development of these the value in the event of a break in said belt, and in step d) it is determined that an occurrence of a belt break can be excluded if the further comparison in step c) shows that the development of the measured value of the parameter over said time period deviates from a possible development of the value has the parameter in case of failure of the said belt. In this case, for example, the voltage of said batten during the said time period can be supplied. Namely, if the battery voltage exceeds a certain value during the entire mentioned time period, such as for example 27 V for several seconds, then the occurrence of belt breakage can be ruled out. According to another embodiment, the charging current from the generator to said batten can be fed during said time period, and in step d) it is determined that the occurrence of belt breakage can be eliminated if in step b) charging current can be fed during the entire said time period. If charging current occurs during the entire time period, belt breakage cannot occur, but delayed charging may be due to malfunctions of the generator's controller and / or that some component has a rectifier bridge connected to the generator.
    According to another embodiment of the invention, the process is carried out on a vehicle having an air conditioning system driven by a wheel driven by said belt to rotate, in step b) a parameter of a medium is fed depending on the operation of the air conditioning system during said time period, and in step d ) it is determined that a belt break exists if, and only if, the development of the measured medium parameter deviates from the said normal development thereof. The said parameter can be the temperature of air supplied by the system, but also, for example, the temperature, pressure or flow of a cold-carrying medium of the air-conditioning system. If it is determined that the air conditioning system is working as it should, then there can be no belt breakage and the vehicle can be quietly driven on for a while longer.
    According to another embodiment of the invention, the method is performed on a vehicle which has a float driven by said belt, in step b) a parameter is measured depending on the cooling flow of said belt, and in step d) it is determined that a belt break exists if, and only if, the development of the measured value of the flattening parameter deviates from the said normal development therefrom. In this case, the speed of the motor vehicle could also be taken into account in the event that a flat wheel of said flat is arranged so that it can also be driven by the speed wind of the vehicle.
    The invention also relates to a device for detecting failure of a belt according to the appended independent device patent claims. The function of such a device and the device according to the embodiment defined in the appended dependent claims appear from the description above of the embodiments of the method according to the invention.
    The invention also relates to a computer program having the features listed in claim 11, a computer program product having the features listed in claim 12, an electronic control unit having the features listed in claim 13 and a motor vehicle according to claims 14 and 15.
    Other advantageous features and advantages of the invention will become apparent from the following description.
    BRIEF DESCRIPTION OF THE DRAWINGS The following is an exemplary embodiment of the invention with reference to the accompanying drawings, in which: Fig. 1 is a simplified view of some components of a motor vehicle driven by a named belt illustrating a method according to an embodiment of the invention Fig. 2 is a view corresponding to Fig. 1 illustrating the process according to other embodiments of the invention, Fig. 3 is a Fig. 1 corresponding view illustrating the process according to still other embodiments of the invention, Fig. 4 is a river diagram showing a process according to a embodiment of the invention, and Fig. is a schematic diagram of an electronic control unit for implementing a method according to the invention. DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION Fig. 1 schematically shows a device for detecting breakage of a belt 1 arranged in a motor vehicle M to be driven by an internal combustion engine 2 and thereby to drive a generator 3 and a cooling water pump 4 for cooling. of the internal combustion engine. The device schematically indicates first means 5 designed to determine the state of operation of the generator and send out a signal of faultless operation of the generator. This signal is transmitted in such a fault-free function to a device 6. A fault-free function meant that the generator operates faultlessly when operating the internal combustion engine 2. Faults in the generator must not necessarily be marked on the vehicle's function, such as charging current supplied to batteries or current to other equipment in capacity utilization if such equipment is not high. The said error may be due to the belt 1 Ott off, so that a rotor has the generator not rotating, or that the generator's regulator is malfunctioning or some component has a rectifier bridge has the generator Ott probes. Any winding has the generator's stator can also have Ott probes. When any of this or other fault has the function of the generator occurs, said means 5 ceases to send said signal to the device 6.
    The device further comprises means 7 arranged for a period of time which is wholly or partly after the time of a cessation of said first means to transmit said signal continuously or intermittently feeding a parameter has another component has the vehicle to the generator, in the the case of the coolant pump 4, the value of this parameter being dependent on whether said belt is intact or interrupted. The device furthermore has other means 8 designed to compare the development of the measured value of said parameter over said time period with a normal development of this value at full belt.
    Said first 5 and second means 8 are designed to send information about the function of the generator and the result of said comparison further to the device 6, which is designed to determine that a belt break may exist if and only if said comparison shows that the development of the measured value over said time period deviates from the said normal development.
    When determining that a belt break may be present, this information is passed on to a display 9 which shows this to the driver, for example by lighting a red lamp. The device 6 can also be designed to send another signal to the display 9 to light another lamp, for example a yellow lamp, if the first means 5 has ceased to transmit its signal of faultless function of the generator, but the comparison is challenged by the second with let 8 shows that the function of the cooling water pump is as would be expected and it has thus been determined that there is no belt breakage.
    In the present case, said means 7 are designed to supply a parameter depending on the cooling flow of the cooling water pump, such as, for example, the temperature of the water therein. If the development of this temperature follows the normal development of this with a full belt, belt breakage can be ruled out. Should, however, the temperature deviate from this normal time period from this normal development by rising considerably, it can be determined that belt breakage exists. Thus, it is assumed that double errors do not occur, ie that it is not possible for the said body 7 to show an error at the same time as an error in the generator occurs. Of course, the function of the feeding means 7 and said second means 8 is automatically checked at appropriate intervals.
    Using Fig. 2, a variety of embodiments of a device according to the invention and methods according to the invention are illustrated. The components included in Fig. 1 are provided with the same male reference numerals as there are. Has shown a number of other components which can be driven by the belt 1 and whose function depends on whether said belt is whole or interrupted, so that a student of the development of a value of a parameter of these but a named time period can be used to determine if belt breakage may or may not be present.
    There are shown means 7 'arranged to feed a parameter of a medium depending on the operation of an air conditioning system driven by a wheel 10 driven by said belt 1 to rotate. Said other means determine that a belt break exists if, and only if, the development of the supplied medium parameter, such as the temperature of air supplied by the air conditioner, during said time period deviates from a normal development thereof.
    It is also shown that the device may comprise means 7 "designed to feed a parameter depending on the cooling flow supplied by a belt 11 driven by the belt. In this case the said other means determines that a belt break exists if, and only if, the development of the measured value of 11 Fig. 3 schematically illustrates a device according to a further embodiment of the invention, two embodiments of the method according to the invention being illustrated by this figure, showing a bat 12 in the vehicle, which the generator 3 is arranged to charge. The regulator and rectifier bridge of the generator are schematically indicated by a separate box 13. According to a method according to an embodiment of the invention, the voltage of the battery 12 is supplied via a supply means 14 during a named period of time. of this in the event of a break in the belt and the device 6 determines that a the occurrence of a belt break can be ruled out if this comparison shows that the development of the measured value of the battery voltage over the said time period deviates from a possible development of the battery voltage in the event of a break in the belt. If, for example, the normal charging voltage of the battery is 28.3 V and the battery "voltage exceeds 27 V for several seconds after cessation of the transmission of the signal of faultless generator function, then belt breakage can be ruled out.
    A method according to another embodiment of the invention relates to the stable supplying the charging current from the generator 3 to the battery 12 via a means 15. The charging current can be supplied during the entire said period of time, as it is determined that there is no belt breakage. The fact that the charging current is lower than normal may be due to the function of the generator's regulator and / or rectifier bridge being deficient.
    Fig. 4 shows a flow diagram illustrating a method according to an embodiment of the invention for detecting breakage of a belt arranged in a motor vehicle to be driven by an internal combustion engine and thereby itself to drive at least one generator and a cooling water pump. The process can be performed with a device of the type illustrated in Figs. 1-3. In a first step Si is asked if a signal of faultless generator function is emitted from said generator. If the answer to this question is no, continue with a step S2, through which a parameter of another component driven by the belt is fed for a period of time. Darpa jam-fors in step S3 the development of the measured values has the parameter with a normal development has these at full belt. Then, in step S4, the question of the measured development deviates from the normal development. If the answer to this question is no, it is determined in step S5 that there is no belt breakage, but if the answer to this question is yes, it is determined in step S6 that belt breakage may exist.
    Computer program code for implementing a method according to the invention is suitably included in a computer program which can be loaded into the internal memory of a computer, such as the internal memory of an electronic control unit of an internal combustion engine. Such a computer program is suitably provided via a computer program product comprising a data storage medium which can be read by an electronic control unit, which data storage medium has the computer program stored there. Said data storage medium is, for example, an optical data storage medium in the form of a CD-ROM, a DVD disc, etc., a magnetic data storage medium in the form of a hard disk, a floppy disk, a cassette tape, etc., or a flash memory or a ROM type. , PROM, EPROM or EEPROM.
    Fig. 5 very schematically illustrates an electronic control unit 16 comprising an execution means 17, as a central processing unit (CPU), for executing computer software. The execution means 17 communicates with a memory 18, for example of the RAM type, via a data bus 19. The control unit 16 also comprises data storage medium 20, for example in the form of a Flash memory or a memory of the type ROM, PROM, EPROM or EEPROM. The execution means 17 communicates with the data storage medium 20 via the data bus 19. A computer program comprising computer program code for implementing a method according to the invention, for example in accordance with the embodiment illustrated in Fig. 4, is stored on the data storage medium 20.
    The invention is of course not in any way limited to the embodiments described above, but a number of possibilities for modifications thereof should be obvious to a person skilled in the art without this being departing from the scope of the invention as defined in the appended claims.
    It is pointed out that in the motor vehicle there may be other components than those shown, which have a function which depends on whether said belt is whole or interrupted and whose function can be checked to determine whether belt breakage is present or not when said means indicates that the generator does not work properly. 14
    权利要求:
    Claims (1)
    [1]
    1. 313
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4263578A|1978-06-08|1981-04-21|Nissan Motor Company, Limited|Belt drive connection malfunction sensor|
    DE19701809C1|1997-01-21|1998-09-03|Bosch Gmbh Robert|Method of testing IC engine|
    FR2777960B1|1998-04-24|2000-06-23|Edouard Bozadjian|INFECTIBLE AND ROTATION CONTROLLED TRANSMISSION SYSTEM|
    BE1012574A6|1999-03-29|2000-12-05|Driessche Jean Vanden|Transmission system including a device for detecting the breakage of thetransmission belt, particularly the transmission belt between the crankshaftand the cam shaft of an engine|
    US6834228B2|2001-10-25|2004-12-21|The Gates Corporation|Belt drive system with automatic belt tension control|
    JP2003314415A|2002-04-23|2003-11-06|Honda Motor Co Ltd|Abnormality detection device for belt mechanism|
    US20060054128A1|2004-09-15|2006-03-16|Neil Allyn|Apparatus and method for detecting coolant belt slippage|DE102016210755A1|2016-06-16|2017-12-21|Contitech Antriebssysteme Gmbh|Method for monitoring a rotor blade adjustment|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1350808A|SE537274C2|2013-07-01|2013-07-01|Method and apparatus for detecting strap rupture on a strap arranged in a motor vehicle|SE1350808A| SE537274C2|2013-07-01|2013-07-01|Method and apparatus for detecting strap rupture on a strap arranged in a motor vehicle|
    DE102014009489.8A| DE102014009489A1|2013-07-01|2014-06-26|Method for detecting belt breakage|
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