Patent ID: 8859158

Claim:
A method for controlling the operation of a fuel cell hybrid system, the method comprising: determining, by a controller, whether an idle stop condition has been satisfied during a normal operation mode of the fuel cell hybrid system; cutting off air supply to a fuel cell to stop the power generation of the fuel cell and reduce the voltage of the fuel cell, in response to the idle stop condition being satisfied; reducing the voltage of a bidirectional converter, connected in series to a battery between the battery and the fuel cell via a bus terminal, to control the output of the battery; controlling the output of the fuel cell, based on a first predetermined value and maintaining the first predetermined value; and charging, forcibly, the battery via the output current of the fuel cell generated by maintaining the reduced voltage of the bidirectional converter, wherein oxygen in a cathode is exhausted and the voltage of the fuel cell becomes lower than the voltage of the bidirectional converter, wherein in the normal operation mode of the fuel cell hybrid system, load-following operation control, in which the output of the fuel cell is controlled according to the load, is performed, and voltage upper limit control, in which a voltage control upper limit value of the bidirectional converter is determined and the voltage of the bidirectional converter controlled according to the load during operation is limited to the voltage control upper limit value of the bidirectional converter, is performed such that the use of a low output region of the fuel cell is limited by the voltage control upper limit value of the bidirectional converter.