Lear Corporation
METHOD AND SYSTEM FOR NOTIFICATION OF AN ACTIVE SHORT CIRCUIT CONDITION IN AN ELECTRIC MOTOR OF A HYBRID ELECTRIC VEHICLE

Abstract:

A system for active short circuit notification in an electric motor of a hybrid electric vehicle including a traction battery, an internal combustion engine in mechanical communication with the motor, and a propulsion system driven by the motor or engine. The system includes an inverter and inverter controller to generate signals to operate inverter switches to produce AC for the motor or DC for battery charging. In response to motor speed exceeding a threshold, the inverter controller is configured to generate signals to operate the switches to produce an active short circuit in the motor to prevent battery overcharging. In response to an active short circuit, the inverter controller is configured to transmit a notification signal to a vehicle controller configured to generate an engine stop control signal operative to stop the engine to reduce current circulation between the inverter and motor caused by the active short circuit.