Method and system for collecting regenerative braking energy...

Details Method and system for collecting regenerative braking energy... Method and system for collecting regenerative braking energy...

B - Operations, Transporting

60

L

B60L 7/10 (2006.01) B60T 1/10 (2006.01) B60K 6/04 (2006.01)

Patent

CA 2361899

This invention is a regenerative brake control method and system for a hybrid electric vehicle (HEV) with a disconnect clutch separating the engine from the motor. When the engine is disconnected from the HEV powertrain, more regenerative braking energy is possible because the negative powertrain torque of the engine's friction and pumping is eliminated. The control can determine when to disconnect and reconnect the engine to the powertrain using, for example, driver demand, vehicle speed, accelerator position, brake pedal position, engine state, motor state, and motor fault status. The control also minimizes powertrain disturbance to improve vehicle drivability by continuously adjusting the amount of regenerative braking to correspond to the changing torque of the engine on the powertrain during disconnect or reconnect.

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