Engine start detection in a hybrid electric vehicle
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-017/00
B60W-020/00
B60K-006/20
B60K-006/00
출원번호
UP-0810217
(2007-06-05)
등록번호
US-7617808
(2009-11-27)
발명자
/ 주소
Aswani, Deepak
Masterson, Brandon R.
Soliman, Ihab S.
Silveri, Andrew J.
대리인 / 주소
Kelley, David B.
인용정보
피인용 횟수 :
6인용 특허 :
12
초록▼
A method for detecting sustained combustion in the engine of a hybrid electric powertrain that includes a starter/generator driveably connected to the engine, a transmission for driving a load, and an input clutch for opening and closing a drive connection between the electric machine and the transm
A method for detecting sustained combustion in the engine of a hybrid electric powertrain that includes a starter/generator driveably connected to the engine, a transmission for driving a load, and an input clutch for opening and closing a drive connection between the electric machine and the transmission, includes the steps of using the starter/generator to produce torque and crank the engine, preparing the engine to produce combustion, producing torque capacity across the input clutch while slipping the clutch, and continuing use of the starter/generator until a sum of the crankshaft torque applied by the starter/generator and the crankshaft torque applied by the transmission is less than some torque threshold for a predetermined period length.
대표청구항▼
What is claimed is: 1. A method for detecting sustained combustion in the engine of a hybrid electric powertrain that includes an electric machine driveably connected to the engine, a transmission for driving a load, and an input clutch for opening and closing a drive connection between the electri
What is claimed is: 1. A method for detecting sustained combustion in the engine of a hybrid electric powertrain that includes an electric machine driveably connected to the engine, a transmission for driving a load, and an input clutch for opening and closing a drive connection between the electric machine and the transmission, the method comprising the steps of: (a) using the electric machine to crank the engine; (b) activating an engine operating parameter that will start the engine; (c) producing slip across the input clutch; (d) determining that a sum of torque applied to a crankshaft of the engine by the machine and torque applied to said crankshaft by the transmission is less than a reference torque magnitude; and (e) discontinuing use of the electric machine to crank the engine. 2. The method of claim 1, further comprising the step of allowing the input clutch to become fully engaged. 3. The method of claim 1, wherein step (a) further comprises the step of using the electric machine to crank the engine at a reference engine speed. 4. The method of claim 1, wherein step (b) further comprises the step of at least one of supplying fuel to the engine, supplying air to the engine; producing an ignition spark in a combustion chamber of the engine. 5. The method of claim 1, wherein step (d) further comprises the steps of: determining the crankshaft torque produced by the machine; determining the crankshaft torque applied by the transmission; and adding the crankshaft torque produced by the machine to the crankshaft torque applied by the transmission. 6. The method of claim 5, wherein the step of determining the magnitude of torque produced by the machine further comprises the steps of: determining a magnitude of electric power supplied to the electric machine; determining a magnitude of electric power loss by the electric machine; and using a difference between said supplied power and said lost power to determine the magnitude of torque produced by the machine. 7. The method of claim 5, wherein the step of determining the crankshaft torque applied by the transmission comprises the steps of: using at least one of slip across the clutch, temperature of the input clutch, pressure applied to friction surfaces of the clutch, effective radius of the mating friction surfaces of the clutch from an axis of rotation, coefficient of friction of the friction surfaces, and gain of the clutch. 8. The method of claim 1, wherein step (d) further comprises the steps of: determining the crankshaft torque applied by the machine; determining the crankshaft torque applied by the transmission; and adding the crankshaft torque applied by the machine to the crankshaft torque applied by the transmission; determining a magnitude of the reference torque; determining a length of a reference period; and determining a length of a period during which the said magnitude of torque is less than said reference torque. 9. A method for detecting sustained combustion in the engine of a hybrid electric powertrain that includes a starter/generator driveably connected to the engine, a transmission for driving a load, and an input clutch for opening and closing a drive connection between the electric machine and the transmission, the method comprising the steps of: (a) using the starter/generator to produce torque and crank the engine; (b) preparing the engine to produce combustion; (c) producing torque capacity across the input clutch while slipping the clutch; (d) continuing said use of the starter/generator until a sum of the crankshaft torque applied by the starter/generator and the crankshaft torque applied by the transmission is less than a reference torque for a predetermined period length. 10. The method of claim 9, further comprising the step of discontinuing use of the starter/generator to crank the engine. 11. The method of claim 9, further comprising the step of allowing the input clutch to become fully engaged. 12. The method of claim 9, wherein step (a) further comprises the step of using the starter/generator to crank the engine at a reference engine speed. 13. The method of claim 9, wherein step (b) further comprises the step of using at least one of supplying fuel to the engine, supplying air to the engine; producing an ignition spark in a combustion chamber of the engine. 14. The method of claim 1, wherein step (d) further comprises the steps of: determining a magnitude of crankshaft torque applied by the starter/generator; determining a magnitude of crankshaft torque applied by the transmission; and adding the crankshaft torque applied by the starter/generator to the crankshaft torque applied by the transmission. 15. The method of claim 14, wherein the step of determining the magnitude of torque produced by the starter/generator further comprises the steps of: determining a magnitude of electric power supplied to the starter/generator; determining a magnitude of electric power loss by the starter/generator; and using a difference between said supplied power and said lost power to determine the magnitude of torque produced by the starter/generator. 16. The method of claim 14, wherein the step of determining the crankshaft torque applied by the transmission comprises the steps of: using at least one of slip across the clutch, temperature of the input clutch, pressure applied to friction surfaces of the clutch, radius of the mating friction surfaces of the clutch from an axis of rotation, coefficient of friction of the friction surfaces, and gain of the clutch. 17. The method of claim 14, wherein step (d) further comprises the steps of: determining the crankshaft torque applied by the starter/generator; determining the crankshaft torque applied by the transmission; summing the crankshaft torque applied by the starter/generator and the crankshaft torque applied by the transmission determining a magnitude of the reference torque; determining a length of a reference period; and determining a length of a period during which the summed magnitude of torque is greater than the reference torque.
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이 특허에 인용된 특허 (12)
Kobayashi,Yasuhiko, Drive apparatus for hybrid vehicle and control method thereof.
Colvin,Dan; Ortmann,Walt; Kraska,Marvin; Bailey,Kathleen; Yamazaki,Mark; Masterson,Brandon, System and method for engine start detection for hybrid vehicles.
Kumar Ajith Kuttannair (Erie PA) Stitt Thomas Detlor (Erie PA), Using sensed stator terminal voltages for determining alternator rotor position for cranking an engine.
Johri, Rajit; Wang, Xiaoyong; Liang, Wei; Yamazaki, Mark Steven; Kuang, Ming Lang, Method for controlling an electric machine in a vehicle with an engine disconnect clutch.
Ortmann, Walter Joseph; Colvin, Daniel Scott; Masterson, Brandon R.; Baldwin, Reid Alan; Silveri, Andrew John; Connolly, Francis T.; Kraska, Marvin Paul, Vehicle and method for controlling engine start in a vehicle.
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