• 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 of starting a vehicle, said vehicle comprising an internal combustion engine for generating drive power for transmission to at least one drive wheel via a clutch and a gearbox, said drive force being selectively transmitted from said motor to said drive wheel by tapping said clutch, and wherein shifting by means of said gearbox is at least partially controlled by a control system arranged in said vehicle. Named control system performs the steps of, with said clutch engaged and at a request for starting with clutch clutch, activating the vehicle starter motor with engaged gear, and with the aid of said starter motor accelerating said engine to a first speed, said first speed being a speed at which said internal combustion engine starts. Fig. 2
    公开号:SE0950662A1
    申请号:SE0950662
    申请日:2009-09-14
    公开日:2011-03-15
    发明作者:Peter Juhlin-Dannfelt；Richard Bostroem；Peter Asplund；Johan Kingstedt
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    l0 l5 20 25 30 as far as possible, the vehicle on its own can go to a workshop or other suitable place even when a fault has occurred.
    Heavy vehicles can therefore often be put in a so-called "Limp Home" mode, which means that some functions can be switched off while the most important ones are retained at least in part so that the vehicle can be moved to a suitable place for its own machine, even at maximum vehicle speed. in such a "Limp Home" mode may be limited to a significantly lower speed than what the vehicle can normally be driven at. Although the Limp Home mode in many cases means that the vehicle can be moved safely to the desired location without salvage assistance, there are still situations where such movement is not possible. There is thus a need for improved opportunities to avoid e.g. salvage in certain situations.
    SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of steering a vehicle at the start of said vehicle which solves the above problems. This object is achieved with a method according to claim 1.
    The present invention relates to a method of starting a vehicle, said vehicle comprising an internal combustion engine for generating propulsion for transmission to at least one drive wheel via a clutch and a gearbox, said drive force being selectively transmitted from said engine to said drive wheel by closing of said clutch, and wherein shifting by means of said gearbox is at least partially controlled by a control system arranged in said vehicle. The method is characterized in that said control system, with said clutch 105 closed and at a request for starting with closed clutch, activates the starter motor of the vehicle with engaged gear, and by means of said starter motor accelerates said engine to a first speed, said first speed is a speed at which said internal combustion engine starts.
    By accelerating the engine to a speed at which the engine starts, the engine can thus be started even though the driveline is closed, e.g. due to an error preventing opening of said coupling. The speed at which the engine starts may depend on the load that the closed driveline exerts on the engine. However, diesel engines in particular have a high available torque even at low speeds, which is why the engine, even with the throttle closed, often starts even at a relatively low speed. Thus, the invention means that further travel with the vehicle can be made possible even though the coupling functions incorrectly.
    Furthermore, the vehicle can be started in a controlled manner without behaving in a surprising manner for the driver, since the driver actively demonstrates awareness of the vehicle's behavior with a closed driveline through said closed clutch start request.
    Additional features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments and the accompanying drawings.
    Brief Description of the Drawings Fig. 1 shows a driveline in a vehicle in which the present invention can be used to advantage. Fig. 2 shows an exemplary method according to the present invention.
    Detailed description of exemplary embodiments As mentioned above, it can be both time consuming and costly to salvage heavy vehicles, so it is often preferable that the vehicle can go to a workshop or other suitable place on its own, even when a serious fault has occurred.
    Heavy vehicles are often equipped with automatic gearboxes. However, these gearboxes usually do not consist of automatic gearboxes in the traditional sense, but of an automatically controlled shifting of "manual" gearboxes. This is partly due to the fact that manual gearboxes are significantly cheaper to manufacture, but also because these have a higher efficiency.
    Due to the fact that the gearbox is of the manual type, unlike conventional automatic gearboxes, a coupling is required in order to be able to load a gearbox when the vehicle is stationary without risking damage to the driveline.
    This coupling can be used in different ways for different types of drivelines. In one type, the clutch function can be controlled by the driver of the vehicle by using a clutch pedal, where the clutch is used when starting the vehicle from a standstill, but where all other shifting can be performed with closed clutch of the vehicle control system.
    In another type of driveline, still with gearboxes of the above type, a clutch is used which is completely controlled automatically by the vehicle's control system, whereby the driver only has access to the accelerator pedal and brake pedal. During a normal departure with a vehicle equipped with an automatically controlled clutch, the vehicle's control system will close the clutch, thus connecting the engine to the rest of the driveline when the driver presses the accelerator pedal.
    Regardless of whether the clutch is controlled manually or by the vehicle's control system, a working clutch is thus required in order for a customary start of the vehicle to be performed.
    An example of a situation that may arise where salvage needs are normally present is the case where the clutch itself, or a clutch controlling means such as a clutch actuator, malfunctions. The clutch is usually spring-loaded in such a way that in the case of a pressure-relieved clutch actuator / clutch pedal it is in the closed position, the motor thus being connected to the gearbox.
    If the vehicle's clutch cannot be opened, the vehicle cannot be started either. This is because heavy vehicles are arranged for safety reasons so that the starter motor cannot be activated without the driveline being broken, ie. the clutch must be open, or the neutral gear must be engaged.
    Otherwise, in the event that the clutch is closed and a gear is engaged at the same time as the starter motor is activated, the vehicle would uncontrollably jump forward with the risk of colliding with an object in front of the vehicle. If, on the other hand, the engine is started with the neutral gear engaged, or if the engine is already running with the neutral gear engaged, it is not possible to engage a gear with the clutch closed without the risk of seriously damaging the driveline.
    However, it is desirable that the vehicle, despite a malfunctioning clutch, should still be able to be started and driven, e.g. to a workshop, without the need for salvage assistance. The present invention solves this by means of a method as below, where a controlled start with engaged gear is possible.
    Fig. 1 shows an exemplary driveline in a vehicle 100 according to the first exemplary embodiment of the present invention. The vehicle 100 schematically shown in Fig. 1 comprises only one axle with drive wheels 113, 114, but the invention is also applicable to vehicles where more than one axle is provided with drive wheels.
    The driveline comprises an internal combustion engine 101, which is connected in a conventional manner to a gearbox 103 via a clutch 106.
    The vehicle further comprises drive shafts 104, 105, which are connected to the vehicle drive wheels 113, 114, and which are driven by a shaft 107 emanating from the gearbox 103 via a shaft gear 108, such as, for example, a conventional differential.
    The coupling 106 is of the lamella type, i.e. a friction element (lamella) 110 connected to the input shaft 109 of the gearbox selectively engages the engine flywheel 102 to transmit driving force from the internal combustion engine 101 to the drive wheels 113, 114 via the gearbox 103. The engagement of the clutch plate 110 with the output shaft 102 of the engine is controlled by a pressure plate 111. , which is displaceable laterally by means of e.g. a lever 112, the operation of which is controlled by a clutch actuator 115 or conventional clutch pedal (not shown). The action of the clutch actuator 115 on the lever 112 is in turn controlled by the control system of the vehicle. The present invention is applicable both to vehicles with manually controlled clutch and to vehicles with automatically controlled clutch, but is perhaps particularly advantageous when used in vehicles with an automatically controlled clutch. 10 15 20 25 30 Vehicle control systems in modern vehicles usually consist of a communication bus system consisting of one or more communication buses for interconnecting a number of electronic control units (ECUs), or controllers, and various components located on the vehicle. Such a control system can comprise a large number of control units, and the responsibility for a specific function can be divided into more than one control unit. For the sake of simplicity, Fig. 1 shows only such a control unit 116, which controls the clutch (clutch actuator 115). In fact, the control unit 116's control of the clutch actuator 115 is likely to e.g. depend on information such as received from the control unit responsible for the function of the gearbox 103, as well as from the control unit (s) controlling engine functions.
    The method according to the present invention can advantageously be implemented as a computer program comprising program code, which when said program code is executed in a control unit causes said control unit to perform the method according to the invention. The computer program may be stored in a computer readable medium, such as e.g. something from the group comprising: Read-Only Memory (ROM), Programmable ROM (PROM), Erasable PROM (EPROM), Flash Memory, Electrically EPROM (EEPROM) and Hard Disk Drive. shown in Fig. 2.
    The example method begins in a step 201, where it is determined if the coupling and / or the coupling actuator is malfunctioning, and in that case is closed. Normally the clutch (pressure plate 111) is spring-loaded in such a way that if the clutch actuator or clutch pedal does not work, the clutch will be closed without being able to be opened. If in step 201 the connection is found to malfunction and is in the closed position, the method proceeds to step 202, where the driver is alerted to the problem. This can e.g. performed by displaying a message on a display. Thus, the driver becomes directly aware of the error that has occurred, and can act accordingly.
    If the vehicle is still in motion, the driver can plan his journey to avoid unnecessary stops and, if possible, get to a suitable parking space such as a workshop.
    Therefore, if the vehicle is in motion when the malfunction is detected, the method proceeds to step 205, where the control system activates a control method for the gearbox according to which clutch-free shifting is performed. As mentioned above, this type of change is already common today, so the vehicle journey can continue in principle as usual.
    By activating clutch-free shifting, the vehicle can thus be driven in principle as normal as long as the vehicle does not need to be braked completely to a stop, or to a speed less than the speed obtained at idle speed with the lowest gear engaged (when activating clutch-free shifting it can also be It is advantageous to change the way in which the gearbox gears are normally used, for example, it can be ensured that downshifting to the absolute lowest gear really takes place when necessary to avoid as far as possible situations where opening of the clutch is required.) If, however, the vehicle is already still when the fault occurs, or if the driver is forced to stop the vehicle, step 206, e.g. due to a traffic light or other obstacle, the principle of the present invention is applied. If the vehicle is stationary upon detection of the above malfunction (or for some reason has been forced to stop), according to the present invention, the vehicle driver can actively select a limp home mode or "clutchless mode", step 204.
    The driver can activate said clutch-free mode by e.g. by means of a control signal to the control system that said switchless mode is to be activated. Activation of the said switch-free mode can also take place via e.g. a MMI (Man Machine Interface) interface such as e.g. a pressure-sensitive display.
    When a malfunction is detected as above, a safety catch is normally activated in the vehicle's control system, which ensures that the starter motor cannot be pulled around with the gear engaged in order to prevent an undesirable and unexpected vehicle movement for the vehicle driver. However, this safety interlock is overridden by the driver actively signaling activation of said clutch-free mode as above.
    The driver, or, preferably, the steering system, then places an appropriate gear in the gearbox before starting the engine, step 207. Preferably, the steering system is arranged so that it always, and regardless of the driver's choice, "forces" into a gear in the gearbox which does not causing serious damage to the driveline at a start with a closed driveline, and which also does not load the starter motor with more than it can accelerate the internal combustion engine to a speed at which the engine is able to start even though the driveline is closed, and thus the whole vehicle weight loads the starter motor. that the internal combustion engine actually also starts. In addition, since the vehicle should have as low a speed as possible after starting, this typically means the lowest gear. Thus, according to the present invention, the driver is required to actively override the latch that normally prevents activation of the starter motor at closed driveline. This means that the driver will be fully aware of the vehicle's behavior when starting the vehicle, so the driver will not try to start the vehicle at all if there are obstacles in its path. When the driver starts in clutchless mode, e.g. by driving a starter key or a starter button, the starter motor starts to pull around the internal combustion engine, which due to the closed driveline, results in the vehicle starting to move in the direction of travel. The starter motor then accelerates the internal combustion engine to a speed at which the internal combustion engine can start.
    Thus, when the internal combustion engine has started, the vehicle will have substantially reached the speed that the vehicle normally has at the selected gear at idle speed. The driver can then drive the vehicle in principle as usual, with the difference that the control system performs shifting as above without the use of the clutch, and thus move the vehicle to a suitable workshop or parking place for repair. If the driver is forced to brake the vehicle to a speed below the vehicle speed at idle speed at the lowest gear, neutral gear is engaged when the engine speed has decreased to idle speed at the lowest gear to avoid engine stop. When this has happened, the vehicle must be stopped and the above procedure repeated to enable continued travel without the risk of damage to the driveline. Preferably, the driver must repeat the activation of clutch-free mode each time starting from a standstill is performed. Furthermore, the vehicle's control system is preferably arranged so that when braking said vehicle in said clutch-free mode, it is shifted as far as necessary all the way down to the lowest gear in order to be able to drive the vehicle with the gear engaged for as long as possible, and thus also as far as possible, avoid shifting to neutral position, as well as associated start with closed clutch.
    According to the above, a solution is thus obtained where the driver actively states that starting with the gear engaged must be performed, and thus is aware of how the vehicle will behave once starting starts.
    According to an embodiment of the present invention, the risk of the vehicle exhibiting a behavior unexpected to the driver at start-up can be further reduced. In this exemplary embodiment, the driver activates, as before, a clutch-free mode.
    According to this embodiment, however, not only activation of clutch-free mode is sufficient for the engine to be started with a closed driveline, but for the starter motor to actually be activated by the steering system when the driver turns the key / presses the start button, the driver must actively demonstrate his awareness of vehicle behavior. start with closed driveline by actively signaling this to the control system during the time the starter motor is activated. This can e.g. is accomplished by operating an actuator from a first position to a second position, such as the driver pressing a button, pedal, lever or the like while using the ignition key / ignition key to activate the starter motor.
    The operating means is preferably arranged such that resilient means upon pressure relief return said operating means to said first position, whereby the starter motor is immediately stopped by the control system if the driver releases the button / pedal / lever.
    In the above example, start is performed with the lowest gear engaged.
    Starting can, however, be performed in any gear as long as this does not load the engine / starter motor more than it can be started.
    According to the above, however, it can be advantageous to start in as low a gear as possible as this results in as low a speed as possible after starting.
    The invention has so far been described for a situation where the coupling is completely closed at start-up. However, it is conceivable that the clutch, when the fault occurs, is not completely closed but still in such a position that driving force can be transmitted via the clutch. In general, as soon as the clutch plate contacts the flywheel, torque transmission can take place between the engine and the rest of the driveline. The more the clutch is then closed (the harder the clutch plate frictionally engages the flywheel), the more torque can be transmitted between the engine and the rest of the driveline. Exactly how much torque can be transmitted at each point depends on the characteristics of the clutch, which can vary from clutch to clutch.
    The present invention is also applicable in situations where the clutch for some reason is not completely closed, but where the clutch is sufficiently closed so that such a high driving force can be transmitted that the vehicle can be driven in a substantially normal manner with respect to driving power from engine to gearbox. , why these coupling positions are also included in the term "closed coupling" in the appended claims.
    权利要求:
    Claims (15)
    [1]
    A method of starting a vehicle, said vehicle comprising an internal combustion engine for generating propulsion for transmission to at least one drive wheel via a clutch and a gearbox, said propulsion being selectively transmitted from said engine to said drive wheel by closing said clutch, and wherein shifting by means of said gearbox is at least partially controlled by a steering system arranged in said vehicle, characterized in that said steering system, with said clutch closed and at a request for a start with closed clutch, performs the steps of: - activating the vehicle starter motor with engaged gear, and - by means of said starter motor accelerating said internal combustion engine to a first speed, said first speed constituting a speed at which said internal combustion engine starts with closed clutch.
    [2]
    The method of claim 1, wherein said step is performed when a fault prevents opening of said coupling.
    [3]
    A method according to claim 1 or 2, wherein said coupling consists of a coupling automatically controlled by said control system.
    [4]
    The method of any of claims 1-3, further comprising the step of determining whether a driver of the vehicle actively requests a closed clutch start, said control system activating said starter motor only as long as said closed clutch start request is activated.
    [5]
    A method according to any one of claims 1-4, wherein said request for a start with closed clutch is activated by actuating an actuator. 10 15 20 25 30 14
    [6]
    The method of claim 5, wherein said request for a closed clutch start is activated by operating an actuator from a first position to a second position.
    [7]
    The method of claim 6, further comprising the step of, if the vehicle ignition key / start button indicates that the engine is to be started, - activating said starter motor only as long as said actuator is set in said second position.
    [8]
    A method according to claim 6 or 7, wherein resilient means upon pressure relief return said operating means from said second position to said first position.
    [9]
    A method according to any one of the preceding claims, wherein said control system controls the loading of said gear.
    [10]
    A method according to any one of the preceding claims, further comprising the step of, after starting said vehicle, by means of said control system controlling up-and-down gearing with closed clutch.
    [11]
    A method according to any one of the preceding claims, further comprising the step of, when braking said vehicle, when necessary and by means of said control system, shifting down to the lowest gear in order to avoid loading in neutral position.
    [12]
    A computer program comprising program code, which when said program code is executed in a computer causes said computer to perform the method according to any one of claims 1-11. 10 15 20 15
    [13]
    A computer program product comprising a computer readable medium and a computer program according to claim 12, wherein said computer program is included in said computer readable medium.
    [14]
    A system for starting a vehicle, said vehicle comprising an internal combustion engine for generating propulsion for transmission to at least one drive wheel via a clutch and a gearbox, said propulsion being selectively transmitted from said engine to said drive wheel by closing said clutch, and wherein shifting by means of said gearbox is at least partially controlled by a steering system arranged in said vehicle, characterized in that said steering system, with said clutch closed and at a request for starting with closed clutch, is arranged to: - activate the vehicle's starter motor with engaged gear, and by means of said starter motor accelerating said engine to a first speed, said first speed constituting a speed at which said internal combustion engine starts with closed clutch.
    [15]
    Vehicle, characterized in that it comprises a system according to claim 14.
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE0950662A|SE534114C2|2009-09-14|2009-09-14|Method and system for starting a vehicle|SE0950662A| SE534114C2|2009-09-14|2009-09-14|Method and system for starting a vehicle|
    PCT/SE2010/050967| WO2011031225A1|2009-09-14|2010-09-13|Method and system for setting a vehicle in motion|
    EP10815708.2A| EP2478212B1|2009-09-14|2010-09-13|Method and system for setting a vehicle in motion|
    BR112012004227-0A| BR112012004227B1|2009-09-14|2010-09-13|method and system for putting a vehicle in motion, and, vehicle|
    RU2012114850/07A| RU2498104C1|2009-09-14|2010-09-13|Method and system for driving vehicle|
    CN201080040574.1A| CN102481934B|2009-09-14|2010-09-13|Method and system for setting a vehicle in motion|
    US13/395,487| US8655562B2|2009-09-14|2010-09-13|Method and system for setting a vehicle in motion|
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