Patent ID: 11909080
Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A fuel cell system comprising:
a fuel cell;
a gas supply unit configured to supply gas to the fuel cell;
an electric power storage device capable of storing at least electric power generated by the fuel cell;
a remaining capacity monitor configured to detect a remaining capacity in the electric power storage device; and
a control unit configured to execute a purging process for purging an inside of the fuel cell with the gas by driving the gas supply unit, and a charging process for charging the remaining capacity of the electric power storage device with the power generated by the fuel cell, wherein
upon input of a stop instruction of the fuel cell system, the control unit determines whether low temperature conditions are met, wherein the low temperature conditions include a temperature related to a state of the fuel cell being equal to or lower than a predetermined threshold value,
when the control unit determines that the low temperature conditions are met, the control unit executes the purging process so as to discharge more of moisture stored in the fuel cell to an outside of the fuel cell, as compared with when the control unit determines that the low temperature conditions are not met,
when the control unit determines that the low temperature conditions were met at a time of a previous stop of the fuel cell system, and the purging process was performed at the time of the previous stop of the fuel cell system, the control unit does not execute the purging process during a subsequent stopped period of the fuel cell system even when freezing conditions are established during the subsequent stopped period, and
the control unit executes the charging process with a target remaining capacity of the electric power storage device set to a smaller value, as compared with when the control unit determines that the low temperature conditions are not met.