• 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 The invention relates to a method for controlling a hybrid driveline (2) in a vehicle, comprising an internal combustion engine (3), an electric machine (4), and a gearbox (6) with an input shaft (10) and an output shaft (18), the internal combustion engine (3) and the electric machine (4) being connected to the input shaft (10). The method comprises the steps of controlling the gearbox (6) to a neutral layer, regulating the speed of the electric machine (4) to a predetermined speed, which corresponds to a milling speed for the input shaft (10) according to the next selected gear ratio, placed in a gear in the gearbox (6 ), regulate the electric machine (4), so that the electric machine (4) is accelerated or decelerated depending on a requested torque for the vehicle (1), detect when a control signal for the electric machine (4) corresponds to a predetermined signal value, and regulate the electric machine (4) to it begarda drive moment. The invention also relates to a hybrid line and a vehicle (1) as well as a computer program (P) and a computer program product.
    公开号:SE1351381A1
    申请号:SE1351381
    申请日:2013-11-21
    公开日:2015-05-22
    发明作者:Mattias Nilsson；Fredrik Sundén；Mats Liwell；Afram Kourie
    申请人:Scania Cv Ab；
    IPC主号:
    专利说明:

    Method for controlling a hybrid driveline, a hybrid driveline, and a vehicle.
    BACKGROUND OF THE INVENTION AND PRIOR ART The present invention relates to a method of steering a hybrid driveline in a vehicle according to the preamble of claim 1. The invention also relates to a hybrid driveline, according to the preamble of claim 6, which comprises means adapted to perform the control of the method. The invention also relates to a vehicle according to the preamble of claim 7, which comprises such a hybrid driveline.
    There is a danger that trucks are equipped with a transmission of both automatic and manual type. on this type of transmission, a shift is performed from a first gear to a second gear by shifting the gearbox from a torque state in the driveline to a torqueless state, then laying out the current gear, then synchronizing the input shaft speed and the side shaft speed to the speed corresponding to the second gear. Then the second gear is loaded, after which the gearbox is continued in a driveline torque condition requested by the driver.
    The vehicle can be driven by an internal combustion engine and an electric machine, which work together to deliver the desired effect and to, among other things, obtain a good fuel economy for the vehicle. The electric machine can act as an electric motor at acceleration and constant speed of the vehicle. When decelerating the vehicle, the electric machine can act as a generator and apply a braking torque to the vehicle's driveline.
    In the driveline, there is a gap between the components cooperating in the transmission, which gaps arise from, for example, gear play between gears in engagement. There is also a torsionally resilient effect on the rotatable axles present in the driveline. The play and the torsion-resilient effect become most palatable when the gearbox is continued in a driveline torque state Iran a torqueless state. In the event that the electric machine is greatly accelerated or decelerated after the second gear has been loaded, the said play and resilient axles will carry a pulse and shockwave in the hybrid driveline, which will be perceived as disturbing drivers and passengers in the vehicle. The pulse and shockwave can also cause a swing in the hybrid driveline due to the torsionally resilient effect of the axles. This swing will also be experienced as uncomfortable by the vehicle's driver and passengers.
    After the second gear has been engaged and torque is to be applied to the transmission, there is no guarantee that the internal combustion engine will be operated at the speed required to be able to engage and supply torque to the transmission. This takes time to control the internal combustion engine to the desired speed and torque.
    Document WO 2011141233, A1 discloses a vehicle which is fitted with a hybrid driveline which includes an internal combustion engine and an electric machine. When changing, the electrical machine's moment of inertia is used for synchronization. Thus, synchronization rings in the gearbox can be eliminated.
    SUMMARY OF THE INVENTION Despite known solutions, there is a need to further develop a hybrid driveline which provides good comfort in the vehicle during shifting, which has a short shifting time and which compensates for a poorly estimated contact point between coupling parts of the coupling device when connecting the internal combustion engine.
    The object of the present invention is thus to provide a hybrid driveline which provides good comfort in the vehicle when shifting.
    A further object of the invention is to provide a hybrid driveline which has a short switching time.
    Another object of the invention is to provide a hybrid driveline which compensates for an inadequately estimated contact point between coupling parts of the coupling device when coupling the internal combustion engine to the hybrid driveline.
    These objects are achieved by a method for controlling a hybrid driveline in a vehicle of the type mentioned in the introduction, which can be characterized by the features stated in claim 1. Such a hybrid driveline will provide good comfort when changing for drivers and passengers in the vehicle. By controlling the acceleration or deceleration of the electric machine and detecting a control signal when the electric machine reaches or exceeds a predetermined torque level, a pulse and shock wave in the hybrid driveline can be avoided, which means that the comfort in the vehicle slows.
    According to one embodiment, the acceleration and torque of the electric machine are regulated. This means that any play and torsional suspension effects in the driveline are taken care of and equalized, which means that a pulse and shockwave in the hybrid driveline are avoided, so that the comfort in the vehicle increases.
    According to another embodiment, the internal combustion engine is switched on when a predetermined torque of the electric machine has been reached, or when a maximum torque for the electric machine has been reached if the maximum torque for the electric machine is lower than the predetermined torque. Since the coupling device is switched off and the internal combustion engine is only switched on when the play and torsion spring wave in the driveline have been turned up, compensation is obtained for a deficiently estimated contact point between the coupling parts of the coupling device. This provides a robustness and smooth connection of the internal combustion engine.
    According to another embodiment, the internal combustion engine is disconnected from the input shaft by means of the coupling device before switching takes place. The hybrid driveline will then have a legal changeover time.
    The above objects are also achieved by a hybrid driveline of the initial name 25 da type, which may be characterized by the features mentioned in claim 6, and by a vehicle of the type mentioned in the introduction, which may be characterized by the features specified in claim 7.
    Further advantages of the invention will become apparent from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS In the following, as an example, preferred embodiments of the invention are described with reference to the accompanying drawings, in which: Fig. 1 shows in a side view a schematically shown vehicle with a driveline according to the present invention, Fig. 2 Fig. 3 shows in a side view a schematically shown driveline according to the present invention, Fig. 3 shows a diagram of speed and torque in the method for controlling the hybrid driveline according to the present invention, and Fig. 4 shows a flow chart Over the procedure for controlling the hybrid driveline according to the present invention .
    DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION Fig. 1 shows a schematic side view of a vehicle 1, which comprises a hybrid driveline 2 with an internal combustion engine 3 and an electric machine 4, which are connected to a gearbox 6. The gearbox of the vehicle 6 is further 8.
    Fig. 2 schematically shows a hybrid driveline 2, which comprises the internal combustion engine 3 and the electric machine 4, which are connected to an input shaft 10 of the gearbox 6. The internal combustion engine 3 can be connected to and disconnected from the input shaft 10 by means of a coupling device 12, which can be manual and / or automatically maneuverable. The gearbox 6 is preferably a combined manual and automatic split gear 6 of the split type and also comprises a main shaft 14, a side shaft 16 and an output shaft 18 on which one or more gears 20 are arranged. A retarder 22 is arranged between the main shaft 14 and the output shaft 18. The output shaft 18 is connected to an end shaft 24, which in turn is connected to the drive wheel 8 of the vehicle 1. An electronic control unit 26 is connected to the internal combustion engine 3, the coupling device 12, the electric machine 4 and the gearbox 6 by means of electrical conductors 28. signals through the electrical conductors 28, signals between the electronic control unit 26 and the internal combustion engine 3, the coupling device 12, the electric machine 4 and the gearbox 6 can be transmitted wirelessly. The electronic control unit 26 may comprise a memory M and a computer program P.
    It is also possible to connect a computer 30 to the control unit 26.
    Fig. 3 shows a diagram of speed and torque in the method for controlling the hybrid driveline 2 according to the present invention. The upper solid curve represents the electric machine's 4 speed Ne at a first gear. The dashed curve represents the 4 Ng of the electric machine at a second gear. Thus, the diagram in Fig. 3 represents an upshift. Fig. 3 also shows the torque Te of the electric machine 4 and the torque Tc of the internal combustion engine 3. At time t1, the vehicle 1 is driven by the electric machine 4 at the speed Ni and by the internal combustion engine 3 at the first gear. In order to carry out a shifting process from the first to the second gear, the internal combustion engine 3 is disconnected from the input shaft 10 of the gearbox 6 by means of the coupling device 12 at the time t2. Before that, between the times t1 and t2 the torque of the internal combustion engine 3 has been ramped down to zero, which occurs at t2, after which a torqueless state between the side shaft 16 and the main shaft 14 is created by means of the electric machine 4, which occurs at time t3. When a torqueless condition is created, the first gear is laid out at t3, so that the gearbox 6 assumes a neutral layer. Then a synchronization phase begins where the speed of the electric machine 4 between the times t3 and t4 is reduced towards N2. When the speed of the electric machine night speed N2, which occurs at time t4, the gear of the second gear on the main shaft will assume the same speed as the main shaft, warp the gear of the second gear connected to the main shaft. The loading of the second gear thus takes place at time t4.
    Laying out of the first gear, the synchronization and loading of the second gear takes place in the gearbox 6 and is controlled by the electronic control unit 26. A number of speed sensors and means for sensing torque (not shown) are arranged at the hybrid driveline 2 to provide speed information. and torque of the internal combustion engine 3, the coupling device 12, the electric machine 4 and the components rotated in the gearbox 6. 6 When the second gear is engaged, the electric machine 4 is connected to the drive wheel 8 of the vehicle 1 via the gearbox 6 and the final gear 24. In the gearbox 6 and the final gear 24 there is a gap between the components cooperating in the gearbox 6 and the final gear 24, for example gear play between gears 20 in engagement. There is also a torsionally resilient effect on the rotatable shafts present in the gearbox 6 and the final shaft 24 and on the shafts connecting the gearbox 6, the final shaft 24 and the drive wheels 8, as well as the gimbal and drive shafts. If the electric machine 4 is greatly accelerated after the second gear is engaged, the said play and resilient axles will carry a pulse and state carriage in the hybrid driveline 2, which will be experienced as staring for drivers and passengers in the vehicle 1. The pulse and shock carriage will also induce a oscillation in the hybrid driveline 2 due to the torsionally resilient effect of the axles. This swing will also be experienced as uncomfortable by the vehicle's 1 driver and passengers.
    By regulating the torque of the electric machine 4 with a control signal according to the method according to the invention, a limited torque is obtained, so that a pulse and shock wave in the hybrid driveline 2 is avoided, which means that the negative effects described above are eliminated. Thus, the electric machine 4 is accelerated by a limited torque by means of the control unit 26 after the second gear is engaged at t4. During a period of time between t4 and t5, the speed and torque of the electric machine 4 will drive without any significant torque being transmitted to the drive wheel 8 of the vehicle 1 due to play and torsion suspension in the driveline 2.
    The control signal that regulates the torque of the electric machine 4 can be described as: Te req = Je X thw + re - tie X the ± Offset [1] re req refers to the requested torque of the electric machine 4 corresponds to the moment of inertia has the electric machine 4. thw corresponds to acceleration has the vehicle's drive wheel 8 re corresponds to the torque from the electric machine 4. 7 doe corresponds to the acceleration of the electric machine 4.
    Offset corresponds to a predetermined value for the electric machine acceleration. The lower the offset value, the longer the time to take up the gap in the driveline.
    At t5, a state is reached when the play is taken up by the speed of the electric machine 4. Then the electric machine 4 decelerates, the part of the control signal representing -Je x (be) will give a positive addition to the control signal. When the control signal exceeds a certain predetermined value, which in Fig. 3 occurs at time t6, the play in the driveline is considered be eliminated.
    The greater the play and torsional suspension that occurs in the hybrid driveline 2, the longer the time period between t4 and t6. The time period between t4 and t6 is affected by the offset value, which can be determined or momentarily determined by means of a feedback function to the control unit 26. In the event that the offset value is predetermined, the predetermination is based on empirical value for the size of the play and torsion spring carriage to even out the play and the torsion suspension stroller.
    When the control signal to the electric machine 4 reaches a predetermined signal value, which corresponds to the predetermined torque for eliminated play in the driveline, the torque is increased to a desired torque which is preferably selected by a driver in the vehicle 1. Thus the vehicle 1 will be affected by a desired torque. In the event that the electric machine 4 reaches its limit in terms of speed and / or torque or when a certain calibrable torque level is switched on, the internal combustion engine 3 is connected to the input shaft 10 by activating and switching off the coupling device 12, which takes place at t7. Since the coupling device 12 is closed when the clearance and torsion spring sway in the driveline 2 have been twisted, a compensation is obtained for an inadequately estimated contact point between the coupling parts of the coupling device 12. This provides a robustness and smooth connection of the internal combustion engine 3. When the internal combustion engine 3 is switched on, the torque of the electric machine 4 can be controlled to a predetermined grinding moment based on a suitable operating strategy while a decreasing torque of the electric machine 4 can be compensated with the torque of the internal combustion engine 3. as the forerunner requests, which happens at t8. Fig. 3 represents an upshift from a first gear to a second gear. The invention is also applicable to a downshift from a second to a first gear.
    Fig. 4 shows a flow chart of the method for controlling the hybrid driveline 2 according to the present invention. The method comprises the following steps: directing the gearbox 6 to a neutral layer; adjusting the speed of the electric machine 4 to a predetermined speed corresponding to a milling speed of the input shaft 10 according to the next selected gear ratio; c) lagg in a gear in the gearbox 6; regulate the electric machine 4 so that the electric machine 4 is accelerated or decelerated depending on a requested driving torque for the vehicle 1; detecting when a control signal for the electric machine 4 corresponds to a predetermined signal value; and f) regulating the electric machine 4 to the required torque.
    The grinding speed has the input shaft 10 controlled by the selected gear in the gearbox 6 and can be calculated by the gear ratio between the input shaft 10 and the output shaft 18 of the selected gear. Thus, the speed of the input shaft 10 can be considered as a milling speed before the new gear is loaded.
    During step d) above, the electric machine 4 is accelerated or decelerated depending on whether the requested driving torque of the vehicle 1 is positive or negative, i.e. whether the requested driving torque of the vehicle has a positive or negative sign.
    In step d), the electrical machine 4 can, according to one embodiment, be regulated with a danger-determined torque limitation. During a period of time in step d) the electric machine 4 will accelerate or decelerate without any significant torque being transmitted to the drive wheel 8 of the vehicle 1 due to play and torsional suspension in the driveline 2. By regulating the electric motor with a predetermined torque limitation a pulse is avoided and shock wave in the driveline.
    By detecting in step e) when a control signal for the electric machine 4 corresponds to a predetermined signal value with respect to the torque of the electric machine 4, any play 9 and occurring torsional suspension in the driveline can be taken into account. When the control signal exceeds a certain predetermined value, play and torsional suspension in the driveline are considered to be eliminated, whereby a pulse and shock wave in the driveline are avoided.
    Before step a), according to an embodiment g) the internal combustion engine 3 can be disconnected from the input shaft 10 by means of a coupling device 12. The internal combustion engine 3 is then disconnected from the driveline.
    After step f) ken according to a method in step h) The internal combustion engine 3 is switched on and controlled to the required torque when the electric machine 4 has reached the requested driving torque, or when a maximum torque for the electric machine 4 has been reached if the maximum torque for the electric machine 4 is lower. the requested momentum.
    According to one embodiment, the hybrid driveline 2 is controlled by means of an electronic control unit 26.
    According to the invention, there is provided a computer program P, which may include routines for controlling the hybrid driveline 2 according to the present invention.
    The computer program P may include routines for controlling the gearbox 6 to a neutral layer.
    The computer program P may comprise routines for regulating the speed of the electric machine 4 to a predetermined speed, which corresponds to a template speed for the input shaft 10 according to the next selected gear ratio. The computer program P may include routines for loading a gear in the gearbox 6; The computer program P may comprise routines for regulating the electric machine 4, so that the electric machine 4 is accelerated or decelerated depending on a requested driving torque for the vehicle 1. The computer program P may include routines for detecting when a control signal for the electric machine 4 corresponds to a predetermined signal value. The computer program P may include routines for regulating the electric machine 4 to the required driving torque.
    The computer program P may include routines for regulating the electric machine 4 with a predetermined torque limitation. The computer program P may comprise routines for firstly disconnecting the internal combustion engine 3 from the input shaft 10 by means of a coupling device 12. The computer program P may comprise routines for engaging and controlling the internal combustion engine 3 to the required driving torque when the electric machine 4 has reached the required driving torque, or the maximum torque of the electric machine 4 is reached if the maximum torque for the electric machine 4 is lower than the required driving torque. The program P can be stored in an executable manner or in a compressed manner in a memory M and / or in a read / write memory R.
    The invention also relates to a computer program product comprising a program code stored on a medium, which can be read by a computer 30, to perform the above steps, when said program code is crossed on the control unit 26 or another computer 30 connected to the control unit 26.
    The stated components and features stated above can be combined within the scope of the invention between different specified embodiments. 11
    权利要求:
    Claims (9)
    [1]
    A method for controlling a hybrid driveline (2) in a vehicle (1), comprising - a combustion engine (3), - an electric machine (4), and - a gearbox (6) with an input shaft (10) and an output shaft (18), wherein the barrel-burning motor (3) and the electric machine (4) are connected to the input shaft (10), characterized in that the method comprises the following steps: a) controlling the gearbox (6) to a neutral layer; b) adjusting the speed of the electric machine (4) to a predetermined speed, which corresponds to a milling speed for the input shaft (10) according to the next selected gear ratio; c) lay in a gear in the gearbox (6); d) regulate the electric machine (4), so that the electric machine (4) is accelerated or decelerated depending on a requested driving torque for the vehicle (1); e) detecting when a control signal for the electric machine (4) corresponds to a predetermined signal value; and f) regulating the electric machine (4) to the required driving torque.
    [2]
    Method according to claim 1, characterized in that step d) comprises regulating the electric machine (4) with a predetermined torque limitation.
    [3]
    Method according to one of Claims 1 or 2, characterized in that step a): g) disconnects the internal combustion engine (3) from the input shaft (10) by means of a coupling device (12).
    [4]
    Method according to one of the preceding claims, characterized in that after step f): h) switching on and controlling the internal combustion engine (3) to the required torque when the electric machine (4) has reached the required driving torque, or when one for the electric machine (4) 30 ground torque is reached when the maximum torque for the electric machine (4) is lower than the required driving torque.
    [5]
    A method according to any one of the preceding claims, wherein the hybrid driveline (2) is controlled by means of an electronic control unit (26). 12
    [6]
    Hybrid driveline, characterized in that it comprises means adapted to perform the control of the method according to any one of claims 1-5.
    [7]
    Vehicle, characterized in that it comprises a hybrid driveline (2) according to claim 6.
    [8]
    Computer program (P) may control a hybrid driveline (2) wherein said computer program (P) comprises program code for causing an electronic control unit (26) or another computer (30) connected to the electronic control unit (26) to perform the steps according to any of claims 1-5.
    [9]
    A computer program product comprising a program code stored on a computer readable medium (30) for performing the method steps according to any one of claims 1 to 5, when said program code is crossed on an electronic control unit (26) or another computer (30) connected to the electronic control unit (26). 8 9 1r- .6! A Z ° 6! D 3/4 4t, t3t46 t2t347
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    法律状态:
    优先权:
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    SE1351381A|SE538355C2|2013-11-21|2013-11-21|Method of steering a hybrid drivetrain in a vehicle so that gaps are eliminated by an electric machine|SE1351381A| SE538355C2|2013-11-21|2013-11-21|Method of steering a hybrid drivetrain in a vehicle so that gaps are eliminated by an electric machine|
    EP14864309.1A| EP3071464B1|2013-11-21|2014-11-13|Method for controlling gear shifting in a hybrid driveline by use of an electric machine|
    PCT/SE2014/051349| WO2015076724A1|2013-11-21|2014-11-13|Method for fast change of gears in a vehicle comprising a hybrid driveline|
    PCT/SE2014/051348| WO2015076723A1|2013-11-21|2014-11-13|Method for controlling gear shifting in a hybrid driveline by use of an electric machine|
    KR1020167011791A| KR101776889B1|2013-11-21|2014-11-13|Method for fast change of gears in a vehicle comprising a hybrid driveline|
    EP14863135.1A| EP3071463B1|2013-11-21|2014-11-13|Method for fast change of gears in a vehicle comprising a hybrid driveline|
    US15/032,198| US10189478B2|2013-11-21|2014-11-13|Method for fast change of gears in a vehicle comprising a hybrid driveline|
    US15/032,206| US9963151B2|2013-11-21|2014-11-13|Method for controlling gear shifting in a hybrid driveline by use of an electric machine|
    KR1020167011934A| KR101776890B1|2013-11-21|2014-11-13|Method for controlling gear shifting in a hybrid driveline by use of an electric machine|
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