METHOD AND APPARATUS FOR CONTROLLING AN ELECTRIFIED POWERTRAIN SYSTEM OF A VEHICLE

摘要

A method for controlling a powertrain system includes deactivating a motor disconnect clutch during vehicle operation. Motor speed is decreased to a first inactive speed threshold and an inverter circuit is controlled to an inactive state while monitoring the motor speed. The inverter circuit is deactivated, and when the motor speed decreases to a second inactive speed threshold, the inverter circuit is pulse-activated to operate the electric machine to increase motor speed to the first inactive speed threshold, and then deactivated. The inverter circuit is activated to increase the motor speed to synchronize with speed of the driveline prior to activating the motor disconnect clutch.

主权项

1. A method for controlling a vehicle powertrain system including an electric machine mechanically rotatably couplable to a driveline via a motor disconnect clutch, the method comprising:
deactivating the motor disconnect clutch during vehicle operation; decreasing motor speed of the electric machine to a first inactive speed threshold; controlling an inverter circuit to an inactive state and monitoring the motor speed; deactivating the inverter circuit; monitoring the motor speed; pulse-activating the inverter circuit to operate the electric machine to increase the motor speed to the first inactive speed threshold when the motor speed has decreased to a second inactive speed threshold and then deactivating the inverter circuit; and activating the inverter circuit to increase the motor speed to synchronize with a speed of the driveline and then activating the motor disconnect clutch.