Method and system for selecting an engine operating point for a hybrid vehicle
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B60W-020/00
B60W-010/06
B60W-010/08
B60K-006/46
출원번호
US-0834650
(2015-08-25)
등록번호
US-9227628
(2016-01-05)
발명자
/ 주소
Liang, Wei
Yamazaki, Mark Steven
Wang, Xiaoyong
Johri, Rajit
McGee, Ryan Abraham
Kuang, Ming Lang
출원인 / 주소
Ford Global Technologies, LLC
대리인 / 주소
Kelley, David B.
인용정보
피인용 횟수 :
0인용 특허 :
5
초록▼
A vehicle includes a powertrain having an engine and an electric machine (M/G) connected by an upstream clutch, and a gearbox connected to the M/G by a torque converter. A controller is configured to, in response to a Park or Neutral gear selection and an electrical power request from the M/G, opera
A vehicle includes a powertrain having an engine and an electric machine (M/G) connected by an upstream clutch, and a gearbox connected to the M/G by a torque converter. A controller is configured to, in response to a Park or Neutral gear selection and an electrical power request from the M/G, operate the engine at an engine speed and an engine torque based on the request and M/G speed and torque for improved powertrain efficiency. A method is provided for controlling a vehicle. In response to a Park or Neutral gear selection and an electrical power request from the M/G, the engine is operated at an engine speed and an engine torque based on the request and M/G speed and torque for improved powertrain efficiency.
대표청구항▼
1. A method for controlling a vehicle having an engine selectively coupled to an electric machine by an upstream clutch with the electric machine selectively coupled to a step ratio transmission gearbox by a downstream clutch, comprising: in response to a park or neutral gear selection in the gearbo
1. A method for controlling a vehicle having an engine selectively coupled to an electric machine by an upstream clutch with the electric machine selectively coupled to a step ratio transmission gearbox by a downstream clutch, comprising: in response to a park or neutral gear selection in the gearbox and a request for an electrical power from the electric machine acting as a generator, operating the engine at an engine speed and an engine torque determined from a solution for an optimized powertrain efficiency that satisfies the request for electrical power from the electric machine and maximizes a combined efficiency of the engine and the electric machine. 2. The method of claim 1 wherein a first constraint to the solution is an electric machine speed being the engine speed; and wherein a second constraint to the solution is an electric machine output power generally equal to a mechanical power output of the electric machine minus electrical power losses in the electric machine; andwherein a third constraint to the solution is an engine efficiency including fuel consumption. 3. The method of claim 2 wherein the solution is bounded by a first threshold value limiting engine torque and a second threshold value limiting engine speed to limit noise and vibration produced by the engine. 4. The method of claim 1 wherein a constraint to the solution is an electric machine speed being the engine speed. 5. The method of claim 1 wherein a constraint to the solution is an electric machine output power being generally equal to a mechanical power output of the electric machine minus electrical power losses in the electric machine. 6. The method of claim 1 wherein a constraint to the solution is an engine efficiency including fuel consumption. 7. The method of claim 1 wherein, for the solution, at least one of the engine and the electric machine is operating away from an associated maximum efficient operating point. 8. The method of claim 1 wherein the solution, ωe*, is provided as candidates of pairs of (ωe, τe), where ωe is an engine speed, and τe is an engine torque. 9. The method of claim 8 wherein the solution, ωe*, is provided by: ωe*=argmaxωe(ηpwr)=argmaxωe(τgωg-Peloss(τg,ωg)τeωeηe(τe,ωe))where ηpwr is an overall system efficiency, ωg is an electric machine speed, and τg is an electric machine torque, Peloss is a loss map of the electric machine as a function of electric machine speed and electric machine torque, and ηe is an efficiency of the engine as a function of engine torque and engine speed. 10. The method of claim 9 wherein the solution is constrained by ωe=ωg, Pg=τgωg−Peloss(τg,ωg), and ηe(τe,ωe)=τeωeE·mfuel, where Pg is a power output of the electric machine, E is a heat value of a fuel, and {dot over (m)}fuel is a mass flow rate of fuel into the engine. 11. The method of claim 9 wherein the downstream clutch is a lockout clutch for a torque converter. 12. The method of claim 11 wherein Peloss is determined using: Pe=Pg+Peloss (τg,ωg)+Ptc(ωg), where Pe is a power output of the engine, Pg is a power output of the electric machine, and Ptc is power loss from the torque converter. 13. The method of claim 1 further comprising locking the upstream clutch while operating the engine at the engine speed and the engine torque determined from the solution for the optimized powertrain efficiency. 14. The method of claim 1 wherein the request for the electrical power from the electric machine acting as the generator is made in response to a state of charge of a traction battery being below a threshold value. 15. The method of claim 1 wherein the request for the electrical power from the electric machine acting as the generator is made in response to a vehicle power demand. 16. The method of claim 15 wherein the vehicle power demand is a request for electrical power from a vehicle system or component. 17. The method of claim 16 wherein the vehicle system is a heating, ventilation, and air conditioning (HVAC) system. 18. A method for controlling a vehicle having an electric machine (M/G) coupled to an engine by an upstream clutch and a step ratio transmission gearbox by a downstream clutch, comprising: in response to park or neutral gearbox selection and a request for power generation from the M/G, operating the engine at a speed and a torque determined from a solution that satisfies the request and maximizes a combined efficiency of the engine and the M/G.
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이 특허에 인용된 특허 (5)
Mitchell Herman Roosevelt, Auxiliary motor drive system.
Heap, Anthony H.; Hsieh, Tung-Ming, Method and apparatus to determine a preferred output torque for operating a hybrid transmission in a continuously variable mode.
Liang, Wei; Wang, Qing; Wang, Xiaoyong; Supina, Joseph Gerald; McGee, Ryan Abraham; Kuang, Ming Lang, Method for optimizing powertrain efficiency for a vehicle.
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