Emergency operation method of hybrid vehicle

摘要

An emergency operation method of a hybrid vehicle, which includes an engine, a first motor connected to the engine through an engine clutch and transmitting power to a vehicle wheel, and a second motor connected with the engine to directly transmit power, includes charging a DC-link terminal with a first counter electromotive force of the first motor and the second motor generated by driving energy of the vehicle or power from the engine when a main relay is off while the vehicle travels. A voltage of the DC-link terminal is controlled by using a second inverter which is connected between the DC-link terminal and the second motor in a driving state of the engine. Power is supplied by using the DC-link terminal, of which the voltage is controlled, for an emergency operation of the vehicle.

主权项

1. An emergency operation method of a hybrid vehicle which includes an engine, a first motor connected to the engine through an engine clutch and transmitting power to a wheel of the vehicle, and a second motor connected with the engine to directly transmit power, the method comprising steps of:
charging a direct current (DC)-link terminal with a first counter electromotive force of the first motor generated by driving energy of the vehicle transmitted from the wheel or a second counter electromotive force of the second motor generated by power of the engine when a main relay is off while the vehicle travels; controlling a voltage of the DC-link terminal by using a second inverter connected between the DC-link terminal and the second motor in a driving state of the engine; and supplying power by using the DC-link terminal, of which the voltage is controlled, for an emergency operation of the vehicle, wherein in the step of controlling the voltage of the DC-link terminal, a torque of the first motor is controlled so that an output of the first motor is equal to or smaller than a maximum output of the second motor.