Engine control system

摘要

Methods and systems are provided for adjusting the operation of an electric coolant pump in a hybrid vehicle system. During vehicle compression braking conditions, a motor propels the vehicle while the engine spins un-fueled to absorb torque. During such conditions, the coolant pump is operated based on the absorbed torque to maintain an engine temperature within a threshold.

主权项

1. A method for operating a hybrid vehicle system, comprising:
during conditions when a hybrid vehicle is propelled by a motor and while an engine spins un-fueled, absorbing torque at the engine and not at a system battery to maintain vehicle speed at a desired speed while adjusting operation of an engine coolant pump based on the absorbed torque to control engine temperature, a state of charge of the battery being greater than an upper limit.