Method of controlling a hybrid powertrain to ensure battery power and torque reserve for an engine start and hybrid powertrain with control system
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B60L-015/20
B60W-020/00
출원번호
US-0881271
(2010-09-14)
등록번호
US-8565949
(2013-10-22)
발명자
/ 주소
Christman, Anthony
Ye, Shaochun
Arnett, Michael
출원인 / 주소
GM Global Technology Operations LLC
대리인 / 주소
Quinn Law Group, PLLC
인용정보
피인용 횟수 :
2인용 특허 :
5
초록▼
A method includes determining an amount of power currently available from a battery for tractive torque as an amount of power stored in the battery less an amount of power required to power other vehicle components, and less an amount of power required to start the engine. An output torque limit whe
A method includes determining an amount of power currently available from a battery for tractive torque as an amount of power stored in the battery less an amount of power required to power other vehicle components, and less an amount of power required to start the engine. An output torque limit when torque is provided only by the motor and power required to provide the output torque limit are determined based on test data. A maximum output torque is calculated by multiplying the amount of power determined to be currently available for tractive torque by a ratio of the output torque limit to the amount of power required to provide the output torque limit. The current output torque may be reduced at a predetermined rate until within a predetermined range of the lesser of the maximum output torque and the output torque limit if an engine start is requested.
대표청구항▼
1. A method of controlling a powertrain on a vehicle, wherein the powertrain has an engine, a transmission with an output member, and a motor, comprising: determining an amount of power currently available from a battery for tractive torque; wherein the amount of power currently available from the b
1. A method of controlling a powertrain on a vehicle, wherein the powertrain has an engine, a transmission with an output member, and a motor, comprising: determining an amount of power currently available from a battery for tractive torque; wherein the amount of power currently available from the battery for tractive torque is an amount of power stored in the battery less an amount of power required to power at least some other electrically-powered vehicle components, and less an amount of power required to start the engine, the amount of power currently available from the battery for tractive torque thereby ensuring battery power reserve to start the engine;determining an output torque limit at the output member when torque is provided only by the motor, and an amount of power required to provide the output torque limit based on stored test data and current operating conditions;calculating a power-based maximum output torque that ensures a reserve of power required to start the engine by multiplying the amount of power determined to be currently available from the battery for tractive torque by a ratio of the output torque limit of the motor to the amount of power required to provide the output torque limit; andselecting the lesser of the power-based maximum output torque and the output torque limit as the maximum operating output torque of the powertrain to reduce torque sag when the engine is started. 2. The method of claim 1, further comprising: reducing the maximum operating output torque by the amount of torque required to start the engine if the motor both provides output torque and starts the engine. 3. The method of claim 1, further comprising: decreasing current output torque at a predetermined rate of change until the current output torque is within a predetermined range of the maximum operating output torque if an engine start is requested. 4. The method of claim 3, further comprising: monitoring a position of an accelerator input device; wherein the predetermined rate of change is a first rate of change if the monitored position varies less than a predetermined amount during a predetermined period of time, and is a second rate of change if the monitored position of the accelerator input device varies at least by the predetermined amount over the predetermined period of time. 5. The method of claim 3, wherein the powertrain further includes a generator operatively connected to the engine and to the motor to provide a series operating mode; and wherein the engine start is requested for one of a switch to an operating mode in which the engine provides output torque and a switch to a charge-sustaining mode in which the engine powers the generator to power the motor. 6. The method of claim 1, further comprising: storing the test data in a database that relates the output torque limit and the amount of power required to provide the output torque limit at various battery voltages and transmission output speeds. 7. The method of claim 1, further comprising: adjusting the maximum operating output torque based on motor temperature. 8. The method of claim 1, wherein the powertrain has at least one selectively engageable torque-transmitting mechanism engageable to at least partially establish an operating mode of the powertrain, and further comprising: comparing the maximum operating output torque to a predetermined maximum torque based on hardware limitations of the at least one selectively engageable torque-transmitting mechanism; andrevising the maximum operating output torque to equal the predetermined maximum torque based on hardware limitations if the predetermined maximum torque based on hardware limitations is less than the maximum operating output torque. 9. The method of claim 1, wherein either of the engine and the motor are controlled to provide active damping of the powertrain; and further comprising: reducing the maximum operating output torque by a predetermined amount that ensures adequate battery power reserve and motor torque to provide the active damping. 10. A method of controlling a hybrid powertrain having an engine, an electric motor, and a battery operatively connected to the motor to deliver electric power to the motor when the motor provides torque to an output member for propulsion in an electric-only operating mode, and wherein the battery provides electric power to the motor when the motor provides torque to start the engine, the method comprising: determining the amount of battery power required to start the engine based on stored test data relating peak power to start the engine at least to engine temperature;determining the amount of battery power required to power other electric vehicle components;determining an amount of power currently available from the battery for tractive torque; wherein the amount of power currently available from the battery for tractive torque is an amount of power stored in the battery less the determined amount of battery power required to power the other electric vehicle components, and less the determined amount of battery power required to start the engine;determining an output torque limit at the output member when torque is provided only by the motor and an amount of power required to provide the output torque limit based on stored test data and current operating conditions;calculating a power-based maximum output torque by multiplying the amount of power determined to be currently available for tractive torque by a ratio of the output torque limit of the motor to the amount of power required to provide the output torque limit;selecting the lesser of the power-based maximum output torque and the output torque limit as the maximum operating output torque of the powertrain;reducing the maximum operating output torque by the amount of torque required to start the engine if the motor both provides output torque and starts the engine; anddecreasing current output torque at a predetermined rate of change until the current output torque is within a predetermined range of the maximum operating output torque if an engine start is requested. 11. The method of claim 10, wherein the engine start is requested for one of a switch to an operating mode in which the engine provides output torque and a switch to a charge-sustaining mode in which the engine powers a generator that powers the motor. 12. The method of claim 10, further comprising: storing the test data in a database that relates the output torque limit and the amount of power required to provide the output torque limit at various battery voltages and transmission output speeds. 13. The method of claim 10, further comprising: adjusting the maximum operating output torque based on motor temperature. 14. The method of claim 10, wherein the powertrain has at least one selectively engageable torque-transmitting mechanism engageable to at least partially establish an operating mode of the powertrain, and further comprising: comparing the maximum operating output torque to a predetermined maximum torque based on hardware limitations of the at least one selectively engageable torque-transmitting mechanism; andrevising the maximum operating output torque to equal the predetermined maximum torque based on hardware limitations if the predetermined maximum torque based on hardware limitations is less than the maximum operating output torque. 15. The method of claim 10, wherein the engine and the motor are controlled to provide active damping of the powertrain; and further comprising: reducing the maximum operating output torque by a predetermined amount that ensures adequate battery reserve and motor torque to provide the active damping. 16. The method of claim 10, further comprising: monitoring a position of an accelerator input device; wherein the predetermined rate of change is a first rate of change if the monitored position varies less than a predetermined amount during a predetermined period of time, and is a second rate of change if the monitored position of the accelerator input device varies at least by the predetermined amount over the predetermined period of time. 17. A hybrid powertrain comprising: an engine;a transmission with an input member operatively connectable to the engine and with an output member;an electric motor operable to provide torque through the transmission to the output member for propulsion in an electric-only operating mode and operable to provide torque to start the engine;a generator operatively connectable to the input member to receive power from the engine and generate electrical power to power the motor in a series operating mode;a battery operatively connected to the motor to deliver electric power to the motor in the electric-only operating mode and when the motor provides torque to start the engine,a control system having a controller with a processor that executes an algorithm that determines a power-based maximum output torque that ensures adequate battery power reserve to start the engine;compares the power-based maximum output torque to a predetermined output torque limit; anddecreases torque at the output member at a controlled rate to achieve a torque within a predetermined range of the lesser of the power-based maximum output torque and the predetermined output torque limit prior to the motor starting the engine when an engine start is requested, thereby reducing torque sag at the output member. 18. The hybrid powertrain of claim 17, wherein the controller has a stored database of the power-based maximum output torque and the output torque limit as functions of battery voltage and motor speed determined from dynamometer testing of another motor substantially identical to the motor.
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이 특허에 인용된 특허 (5)
Wagner Thomas,DEX ; Ulm Michael,DEX ; Graf Friedrich,DEX, Controller for an automatic motor vehicle transmission.
Bucknor, Norman K.; Smith, Anthony L., Hybrid powertrain with torque-multiplying engine starting mechanism and method of controlling a hybrid powertrain.
Treharne, William David; Butcher, Jonathan Andrew; Crombez, Dale Scott; Gee, Thomas Scott, Regenerative braking control to mitigate powertrain oscillation.
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