FUEL CELL SYSTEM AND OPERATION CONTROL METHOD OF THE SAME

摘要

The present invention provides a technique capable of satisfying both the restoration of an output voltage of a fuel cell and an improvement of electric power responsiveness in a fuel cell system in a situation in which its operation status is restored to a normal operation from an operation having low power generation efficiency.;A controller updates a lower limit voltage threshold in accordance with the restoration of an FC voltage until the operation status is restored to a normal operation from an operation having low power generation efficiency, such as an intermittent operation and a warmup operation (step S1). The controller increases an FC current in accordance with the updated lower limit voltage threshold (steps S2 and S3) to thereby satisfy both the requirements of the restoration of the output voltage of the fuel cell stack and the improvement of the electric power responsiveness.

主权项

1. A control method of a fuel cell system in a situation in which an operation status is restored to a normal operation from a low efficiency operation having lower power generation efficiency than that of the normal operation, the control method comprising
a first step of increasing an output current of a fuel cell to a preset allowable current when a measured voltage of the fuel cell exceeds a lower limit voltage of the fuel cell; and a second step of updating the lower limit voltage with the measured voltage after increasing the output current, wherein the first step and the second step are repeated until the measured voltage reaches a preset voltage limit.