Method for controlling fuel cell system

摘要

A method includes: determining whether or not an elapsed time since stopping of power generation of a fuel cell until an operation start instruction to start a fuel cell system is detected is shorter than a specified time, if the operation start instruction to start the fuel cell system is detected after the power generation of the fuel cell is stopped; setting, as a first amount, an amount of replacement of a fuel gas on an anode side, if it is determined that the elapsed time is shorter than the specified time; and setting, as a second amount, an amount of replacement of the fuel gas on the anode side, if it is determined that the elapsed time is longer than the specified time. The first amount is larger than the second amount.

主权项

1. A method for controlling a fuel cell system having a fuel cell to generate power according to an electrochemical reaction of an oxide gas supplied to a cathode side with a fuel gas supplied to an anode side, an oxide-gas supply apparatus to supply the oxide gas to the fuel cell, and a fuel-gas supply apparatus to supply the fuel gas to the fuel cell, the method comprising:
an in-stop-mode power generating process of, if an operation stop instruction to stop an operation of the fuel cell is detected, stopping supply of the fuel gas to the fuel cell from fuel-gas supply apparatus, supplying the oxide gas to the fuel cell from the oxide-gas supply apparatus, and stopping power generation of the fuel cell; determining whether or not an elapsed time since the stopping of the power generation of the fuel cell until an operation start instruction to start the fuel cell system is detected is shorter than a specified time, if the operation start instruction to start the fuel cell system is detected after the power generation of the fuel cell is stopped; setting, as a first amount, an amount of replacement of the fuel gas on the anode side at a time of starting the fuel cell system, if it is determined that the elapsed time is shorter than the specified time; and setting, as a second amount, an amount of replacement of the fuel gas on the anode side at the time of starting the fuel cell system, if it is determined that the elapsed time is longer than the specified time, the first amount being larger than the second amount; wherein the specified time is defined as a period of time from a point of time when operation of the fuel cell system is stopped after the in-stop-mode power generating process is executed to a point of time when hydrogen concentration drops down to a predetermined threshold concentration.