Fault-tolerant control method and device of fuel battery vehicle

The invention provides a fault-tolerant control method and device of a fuel battery vehicle. The method comprises the steps of obtaining output voltage of a power battery, output voltage of a fuel battery and present current of the fuel battery; calculating target current of the fuel battery according to the output voltage of the power battery, the capacity of the power battery, default charge and discharge rate of the power battery, default slow-down operation power and the output voltage of the fuel battery; calculating the required regulating quantity of a DC/DC controller according to a deviation value between the target current and the present current of the fuel battery; and regulating the output current of the fuel battery to the target current according to the required regulating quantity of the DC/DC controller. By the fault-tolerant control method of the fuel battery vehicle provided by the invention, slow-down running or normal running of the vehicle can be ensured under the condition that an energy controller is broken down; and the safety problem caused by shutdown of the vehicle is solved.