Patent ID: 9680405
Date: 2017-06-13
CPC Classifications: B60K,B60L,B60W,H02P,Y02T

Claim:
1. An onboard motor controller comprising: a motor drive circuit that includes a plurality of switching elements, and that supplies a drive current to an electric motor based on a command value; a power supply circuit that is connected to a high-voltage direct-current power source for driving the electric motor, and that supplies electricity to the motor drive circuit; and a control circuit that controls the motor drive circuit, wherein the control circuit has a plurality of control modes for controlling driving of the electric motor, and includes a collision detecting unit that detects a collision of a vehicle based on a signal from a sensor provided in the vehicle and a control mode switching unit that switches the control mode, and the control mode switching unit switches the control mode upon detection of the collision of the vehicle, wherein, when an overcurrent is detected through at least one of a detection of phase currents of the electric motor and a detection of a source current after the control mode is switched, the control circuit stops operations of the switching elements in the motor drive circuit, and then terminates connection between the high-voltage direct-current power source and the motor drive circuit to stop a supply of electricity by a power supply relay that establishes or terminates connection between the high-voltage direct-current power source and the motor drive circuit.