Fca US LLC

Chrysler Group LLC

Xiaodong Liu

Dumitru Puiu

Zhenxing Fu

Laszlo Hideg

A start-up method for a hybrid powertrain in which hydraulic pressure is generated in a casual start-up by an electric oil pump motor where certain predetermined conditions are satisfied and the casual start-up is abandoned and hydraulic pressure is generated by an engine where the predetermined conditions are not satisfied. The casual start-up is also abandoned where a vehicle operator seeks propulsion shortly after start-up and before an oil pump is rotating within a predetermined threshold of an oil pump target RPM.

Start-up strategy for hybrid powertrain

A method for assisting a transmission oil pump in a hybrid electric powertrain to generate transmission oil pressure rapidly during vehicle start. An electric motor is initially utilized to provide momentary torque to rotate an oil pump and rapidly generate transmission oil pressure. After initial assistance is provided by the electric motor, an oil pump electric motor powers the oil pump and maintains oil pressure within the hybrid powertrain.

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Windsor, CA, United States of America

Xiaodong Liu