• 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:
    A method of starting an internal combustion engine in a vehicle with a hybrid electric driveline having an internal combustion engine, a generator and a high voltage battery pack is provided. An input signal for starting the internal combustion engine is received. A load on an electric motor and generator is determined. The internal combustion engine receives torque transmitted from said electric motor and generator when the load on said electric motor and generator is lower than a predetermined load threshold. The internal combustion engine receives torque from an exogenous starting device when the load on said electric motor and generator is higher than the predetermined load threshold.
    公开号:SE1151065A1
    申请号:SE1151065
    申请日:2011-11-10
    公开日:2012-06-04
    发明作者:Jay E Bissontz
    申请人:Int Truck Intellectual Prop Co；
    IPC主号:
    专利说明:

    simply turn the crankshaft in the internal combustion engine. However, if a battery pack that supplies power to the electric motor and generator does not have sufficient charge, the internal combustion engine cannot be started. Another situation that can prevent the electric motor and generator from leaving torque to start the internal combustion engine is when the electric motor and generator supply the equipment mounted to the vehicle with continuous power. In such a situation, the electric motor and generator may not have sufficient torque to both deliver power to the equipment and start the internal combustion engine, thus the torque to the equipment would be reduced while the internal combustion engine is started. This can result in unacceptable performance, as the equipment may need to be turned off temporarily.
    Therefore, there is a need for a system that provides an alternative source of torque to start an internal combustion engine, and a method for determining when to use the alternative source of torque.
    SUMMARY OF THE INVENTION According to a process, there is provided a method of starting an internal combustion engine in a vehicle with a hybrid electric driveline having an internal combustion engine, a generator and a high voltage battery pack. An input signal for starting the internal combustion engine is received. A load on an electric motor and generator is determined. The internal combustion engine receives torque transmitted from said electric motor and generator when the load on said electric motor and generator is lower than a predetermined load threshold.
    The internal combustion engine receives torque from an exogenous starting device when the load on said electric motor and generator is higher than the predetermined load threshold.
    According to one embodiment, a hybrid electric driveline comprises an internal combustion engine, an electric motor and generator, an exogenous starting device and an electronic control system.
    Said electric motor and generator connect to the internal combustion engine both to receive torque from the internal combustion engine and to transmit torque to the internal combustion engine. The exogenous starter connects to the internal combustion engine. The electronic control system is in communication with the internal combustion engine, said electric motor and generator and the exogenous starting device. The electronic control system includes logic for initiating one of said electric motor and generator and the exogenous starting device for supplying torque to the internal combustion engine for starting the internal combustion engine.
    According to another embodiment, a physical computer program product comprises a computer usable medium having an executable computer readable program code contained therein. The executable computer readable program code implements a method for starting an internal combustion engine in a vehicle with a hybrid electric driveline having an internal combustion engine, a generator and a high voltage battery pack. The process receives an input signal for starting the internal combustion engine. A load on an electric motor and generator is determined. A charge condition for a high voltage battery pack is determined. The internal combustion engine receives torque from said electric motor and generator when the load on said electric motor and generator is lower than a predetermined load threshold and the charge state of the high voltage battery pack is higher than a predetermined charge level. The internal combustion engine receives torque from an exogenous starter when one of the loads on said electric motor and generator is higher than the predetermined load threshold and the charge state of the high voltage battery pack is lower than a predetermined charge level.
    BRIEF DESCRIPTION OF THE DRAWINGS IN FIGS. FIG. 1 is a schematic diagram showing a vehicle having a hybrid electric driveline.
    FIG. 2 is a flow chart showing a method of starting an internal combustion engine according to a process.
    FIG. 3 is a fate diagram showing a method of starting an internal combustion engine according to another process.
    FIG. 4 is a fate diagram showing a method of starting an internal combustion engine according to a further process.
    DETAILED DESCRIPTION OF THE INVENTION Referring now to the figures, and in particular to FIG. 1, where a schematic diagram of a vehicle having a hybrid electric driveline 10 is shown. The hybrid electric drive line 10 includes an internal combustion engine 12 and a hybrid electric system 14 coupled to the internal combustion engine 12. The hybrid electric system 14 may include an electric motor and generator adapted to act as a generator and generate electrical power when driven. of the internal combustion engine and is also capable of acting as an electric motor when it receives power from a high voltage battery pack 15. Said electric motor and generator are also adapted to function as a starting motor for leaving torque to start the internal combustion engine 12 during at least some of the times the internal combustion engine 12 is started. The term "running" as used herein refers to delivering torque to a crankshaft in the internal combustion engine to rotate the crankshaft while the internal combustion engine is started, i.e. before combustion of fuel inside the cylinders of the internal combustion engine leaves torque to rotate the crankshaft. A hybrid motor controller coupled to the hybrid electric system 14 to control the operation of the hybrid electric system 14 such as either a motor, a generator or a starter motor.
    The internal combustion engine 12 and the hybrid electric system 14 can both provide torque to a transmission 18. The transmission 18 includes a power take-off 20. The power take-off 20 enables body equipment 22 to obtain power from either the internal combustion engine 12 or the hybrid electric system 14. The power take-off 20 can supply power to hydraulic pumps, air compressors or the like to provide a power source for the body equipment 22. The body equipment 22 may include, but is not limited to, hydraulic motors, a passenger lift, a crane, a drill, a post hole digger and other devices. - ingar.
    During operation of the hybrid electric driveline 10, situations arise where the power to the transmission 18 is provided exclusively by the hybrid electric system 14 and a control system 24 which includes an electronic system controller (ESC) 26, a hybrid control module ("HC control" or "HCM") 28 and an electronic control module ("ECM") 30 determine that the internal combustion engine 12 needs to be started to deliver power to the hybrid electric driveline 10. For example. it may be determined that the torque requirements for the body equipment 22 exceed the torque delivered by the hybrid electrical system 14, or that the high voltage battery pack 15 has a state of charge which does not allow the hybrid electrical system 14 to continue to supply power to the body equipment 22. In such a situation the internal combustion engine 12 is started to provide torque to the body equipment one.
    To start the internal combustion engine 12, torque is applied to start the internal combustion engine 12 until the combustion of fuel inside the internal combustion engine 12 is initiated. As soon as the control system 24 determines that the internal combustion engine 12 needs to be started, the control system monitors a state of charge of the high voltage battery pack 15. The control system 24 determines whether the high voltage battery pack 15 contains a sufficient charge to use the hybrid electrical system as a torque starter. the internal combustion engine 12. The control system 24 also monitors the torque delivered by the hybrid electrical system 14 which is used to supply power to the power take-off 20 and the body equipment 22. The control system 24 determines whether the hybrid electric system 14 can generate sufficient torque to continue to supply power to power take-off 20 and start the internal combustion engine 12. If the control system 24 determines that the high voltage battery pack 15 has a charge higher than a predefined level, and that the hybrid electrical system 14 can generate sufficient torque to continue power to the power take-off 20 and start the internal combustion engine 12, the hybrid electric system 14 is used as a starter motor to provide torque to start and start the internal combustion engine 12.
    However, if the control system 24 either determines that the charge of the battery pack 15 is lower than the predefined level or determines that the hybrid electrical system 14 cannot generate enough torque to continue delivering power to the power take-off 20 and start the internal combustion engine, control system 24 activates an exogenous starter 32 , 34 to start the internal combustion engine 12. It is contemplated that only one exogenous starter is required, although FIG. 1 shows a first exogenous starter 32 which is an electric motor obtaining power from a battery separate from the high voltage battery pack 15, and a second exogenous starter 34 having an internal combustion engine. It is also thought that other types of exogenous starting devices can be used, such as hydraulic motors, devices that use compressed gas, devices that use heated gas, electric machines, turbines and the like. Although the control system 24 is designed to determine whether the hybrid electrical system 14 or one of the exogenous starting devices 32, 34 should be used to start the internal combustion engine 12, it is also contemplated that a vehicle driver may also decide to utilize the exogenous starting devices 32, 34. If, for example, the body equipment 22 is a passenger lift, the driver may feel more comfortable using the exogenous starting device 32, 34 to start the internal combustion engine 12 if the driver wants to ensure that the operation of the body equipment 22 continues as expected.
    Thus, during normal operation, the control system 24 utilizes the hybrid electric system 14 to provide torque to start the internal combustion engine 12 when the high voltage battery pack 15 has a charge higher than a predefined limit, and the hybrid electrical system 14 is capable of generating sufficient torque to both deliver power to the power take-off 20 and start the internal combustion engine 12. If either the charge level in the high voltage battery pack 15 is lower than the predefined limit or if the hybrid electrical system 14 is not capable of producing sufficient torque to both supply power to the power take-off 20 and start the internal combustion engine 12, however, one of the exogenous starting devices 32, 34 is used to provide torque to start the internal combustion engine 12.
    In addition, the control system 24 may utilize one of the exogenous starters 32, 34 if a fault is detected in the hybrid electrical system 14, thereby interrupting the operation of the hybrid electrical system 14 and the internal combustion engine 12 being used exclusively to supply power to the transmission 18 and power take-off 20.
    FIG. 2 is a flow chart showing a first method of determining whether to use the hybrid electric system 14 to start the internal combustion engine, or one of the exogenous starting devices 32, 34. A signal for requesting the starting of the internal combustion engine is generated at step 100. The signal 100 for requesting the start of the internal combustion engine may be generated by the control system 24 of the hybrid electric driveline 10 or may be provided by a driver or user of the hybrid electric driveline. A torque requirement from the hybrid electrical system is determined at step 102. The method determines if the torque requirement from the hybrid electrical system is lower than a predetermined limit value at step 104. The predetermined limit value may be a value selected based on a magnitude of the torque required to start the internal combustion engine, and provide a certain level of excess torque in addition to what the hybrid electric system 14 leaves to supply power to the transmission 18 and the power take-off 20, so that the hybrid electric system 14 will be able to start the internal combustion engine and supplying power to the transmission 18 and the power take-off 20. If the torque requirement from the hybrid electrical system is not lower than the predetermined limit value, step 106 activates an exogenous starting device to start the internal combustion engine. However, if the torque requirement from the hybrid electric system is lower than the predetermined limit value, the hybrid electric system is used to start the internal combustion engine, as shown in step 108.
    A circuit diagram of another method for determining whether the hybrid electrical system 14 should be used to start the internal combustion engine, or one of the exogenous starting devices 32, 34 is shown in FIG. A signal for the request to start the internal combustion engine is generated at step 200. A state of charge for the high voltage battery pack is determined at step 202. The procedure determines whether the state of charge of the high voltage battery pack is higher than a predetermined limit value at step 204. If the high voltage battery pack is not higher than the predetermined limit value, an exogenous starter is activated at step 206. If the charge state of the high voltage battery pack is higher than the predetermined limit value, the method determines a torque requirement from the hybrid electrical system at step 208. of torque from the hybrid electric system is lower than a predetermined limit value at step 210. If the torque requirement from the hybrid electric system is not lower than the predetermined limit value, step 212 activates an exogenous starting device to start the internal combustion engine. However, if the torque requirement from the hybrid electric system is lower than the predetermined limit value, the hybrid electric system is used to start the internal combustion engine, as shown in step 214.
    FIG. 4 shows a circuit diagram of a further method for determining whether the hybrid electric system 14 should be used to start the internal combustion engine, or one of the exogenous starting devices 32, 34. A signal for requesting the starting of the internal combustion engine is generated at step 300. A charge state for the high voltage battery packet is determined at step 302. The method determines if the charge state of the high voltage battery packet is higher than a predetermined limit value at step 304. If the charge state of the high voltage battery packet is not higher than the predetermined limit value, an exogenous preamble is activated in step run the internal combustion engine. If the charge state of the high voltage battery pack is higher than the predetermined limit value, the method determines a torque requirement from the hybrid electrical system at step 308. The method determines if the torque requirement from the hybrid electrical system is lower than a predetermined limit value at step 310. If the need for torque from the hybrid electric system is not lower than the predetermined limit value, step 312 activates an exogenous starting device to start the internal combustion engine. If the torque requirement from the hybrid electrical system is lower than the predetermined limit value, the method determines if a user-provided signal for activating an exogenous starter has been provided at step 314. If a signal given by a user for activating an exogenous starter device was sent, step 316 activates an exogenous starter device to start the internal combustion engine. However, if no signal given by a user to activate an exogenous starter was provided, the hybrid electric system is used to start the internal combustion engine, as shown in step 318.
    It should be understood that a control system can be implemented in hardware to execute the procedure. the control system can be implemented with any or a combination of the following techniques, each of which is well known in the art: a discrete logic circuit having logic gates for implementing logic functions on data signals, an application specific integrated circuit (ASIC) having suitable combinatorial logical gates, one or more programmable gate matrices (PGA), a field programmable gate matrix (FPGA), etc.
    When the control system is implemented in software, it should be noted that the control system can be stored on any computer readable medium for use by or in connection with any computer related system or procedure. In the context of this document, a computer readable medium may be any medium that can store, communicate, distribute or transport the program for the use of or in connection with the instruction execution system, machine or device. The computer readable medium may be, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor based system, machine, device or spreading medium. More specific examples (an incomplete list) of the computer readable medium would include the following: an electrical connection (electronic) having one or more wires, a portable computer disk (magnetic), a RAM (electronic), a ROM (electronic) , an erasable programmable ROM (EPROM, EEPROM or fl memory) (electronic), an optical fiber (optical), and a portable CD-ROM (optical). The control system may be the contents of any computer readable medium for use with or in connection with an instruction execution system, machine or device, such as a computer based system, processor containing system or other system which may retrieve the instructions from the instruction execution system, machine or device and execute the instructions.
    权利要求:
    Claims (20)
    [1]
    A method of starting an internal combustion engine in a vehicle having a hybrid electric driveline having an internal combustion engine, a generator and a high voltage battery pack, the method comprising the steps of: receiving an input signal for starting the internal combustion engine; determining a load on an electric motor and generator; transmitting torque to the internal combustion engine with torque from said electric motor and generator when the load on said electric motor and generator is lower than a predetermined load threshold; and transmitting torque to the internal combustion engine torque from an exogenous starter when the load on said electric motor and generator is higher than the predetermined load threshold.
    [2]
    The method of claim 1, further comprising the steps of: determining a state of charge for a high voltage battery pack; transmitting torque to the internal combustion engine torque from said electric motor and generator when the state of charge of the high voltage battery pack is higher than a predetermined charge level threshold; and transmitting torque to the internal combustion engine torque from the exogenous starter when the charge state of the high voltage battery pack is lower than the predetermined charge level threshold.
    [3]
    The method of claim 2, wherein the predetermined charge level threshold is based on a magnitude of the torque required to rotate a crankshaft in the internal combustion engine.
    [4]
    The method of claim 2, wherein the predetermined charge level threshold is based on a discharge rate of the high voltage battery pack from operation of body-mounted equipment obtaining power from the hybrid electric driveline.
    [5]
    The method of claim 2, further comprising the steps of: determining whether a signal for requesting an exogenous starter has been received; Transmitting torque to the internal combustion engine from said electric motor and generator when no signal for requesting an exogenous starting device has been received; and transmitting torque to the internal combustion engine from the exogenous starter when the exogenous starter request signal has been received.
    [6]
    The method of claim 1, further comprising the steps of: determining whether a signal for requesting an exogenous starter has been received; transmitting torque to the internal combustion engine from said electric motor and generator when no signal for requesting an exogenous starting device has been received; and transmitting torque to the internal combustion engine from the exogenous starter when the exogenous starter request signal has been received.
    [7]
    The method of claim 1, wherein the predetermined load threshold is based on a magnitude of the torque required to rotate a crankshaft in the internal combustion engine.
    [8]
    The method of claim 1, wherein the predetermined load threshold is based on the operation of body-mounted equipment obtaining power from the hybrid electric driveline.
    [9]
    A hybrid electric driveline comprising: an internal combustion engine; an electric motor and generator coupled to the internal combustion engine, said electric motor and generator being arranged to receive torque from the internal combustion engine and to transmit torque to the internal combustion engine; an exogenous starter device connected to the internal combustion engine; and an electronic control system in communication with the internal combustion engine, said electric motor and generator, and the exogenous starting device, the electronic control system including logic for initiating one of said electric motor and generator, and the exogenous starting device for transmitting torque to the internal combustion engine to start the internal combustion engine.
    [10]
    A hybrid electric driveline according to claim 9, wherein the exogenous starting device 10 comprises a second internal combustion engine.
    [11]
    A hybrid electric driveline according to claim 9, wherein the exogenous starting device comprises an electric motor.
    [12]
    A hybrid electric driveline according to claim 11, comprising a low voltage battery connected to the electric motor of the exogenous starting device.
    [13]
    A hybrid electric driveline according to claim 9, wherein the exogenous starting device comprises a hydraulic motor.
    [14]
    The hybrid electric driveline of claim 9, further comprising a second exogenous starter.
    [15]
    The hybrid electric driveline of claim 14, wherein the second exogenous starter comprises an electric motor and the exogenous starter comprises a second internal combustion engine.
    [16]
    A physical computer program product, comprising a computer usable medium having an executable computer readable program code included therein, the executable computer readable program code implementing a method of starting an internal combustion engine in a vehicle with a hybrid electric driveline having an internal combustion engine and a combustion engine. the method comprises the steps of: receiving an input signal for starting the internal combustion engine; determining a load on an electric motor and generator; determining a state of charge for a high voltage battery pack; providing torque to the internal combustion engine from said electric motor and generator when the load on said electric motor and generator is lower than a predetermined load threshold and the state of charge of the high voltage battery pack is higher than a predetermined charge level; and providing torque to the internal combustion engine with torque from an exogenous starter when one of the loads on said electric motor and generator is higher than the predetermined load threshold and the charge state of the high voltage battery pack is lower than a predetermined charge level.
    [17]
    The physical computer program product of claim 16, wherein the predetermined charge level is based on a magnitude of the torque required to rotate a crankshaft in the internal combustion engine.
    [18]
    The physical computer program product of claim 16, wherein the predetermined charge level threshold is based on a discharge rate of the high voltage battery pack from operation of body-mounted equipment obtaining power from the hybrid electric driveline.
    [19]
    The physical computer program product of claim 16, wherein the predetermined load threshold is based on a magnitude of the torque required to rotate a crankshaft in the internal combustion engine.
    [20]
    A physical computer program product according to claim 16, wherein the predetermined load threshold is based on operation of body-mounted equipment obtaining power from the hybrid electric driveline. 12
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    同族专利:
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    法律状态:
    2014-09-30| NAV| Patent application has lapsed|
    优先权:
    申请号 | 申请日 | 专利标题
    US12/960,025|US8219273B2|2010-12-03|2010-12-03|Engine starting control for hybrid electric powertrains|
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