Abstract: A fuel gas supply apparatus of a fuel cell system includes a pressure reducing valve, an interruption valve, and an injector in a hydrogen supply channel. A controller of the fuel cell system includes a drive cycle setting unit for setting the drive cycle of the injector based on a load of the fuel cell stack, and a water state determination unit for determining whether or not quantity of water content in the fuel cell is excessive by determining whether or not the quantity of water content is a predetermined quantity or more.

Abstract: A fuel cell system that can supply fuel gas appropriately is provided. The fuel cell system includes an injector 23A and an injector 23B which inject fuel gas, and an ECU 50. The ECU 50 adjusts the flow rate of the fuel gas that is injected from the injector 23A by adjusting the valve opening time period and the valve closing time period of the injector 23A, which are repeated alternately, and make at least a part of the valve opening time period of the injector 23B overlap with the valve closing time period of the injector 23A when opening the valve of the injector 23B.

Abstract: Provided is a fuel cell system capable of achieving both of improving purge efficiency and preventing deterioration of the fuel cell, and a control method of the fuel cell system. The fuel cell system includes a circulation rate adjusting unit that adjusts a circulation rate of a circulation gas, a first startup purge unit that performs the first startup purge by opening a purge valve in a state where the circulation rate of the circulation gas is increased to be a mixing promotion rate capable of promoting mixing of the fuel gas with the circulation gas at system startup of the fuel cell system, and a second startup purge unit that performs the second startup purge by opening the purge valve in a state where the gas circulation rate is reduced to be less than the mixing promotion rate after the first startup purge.

Abstract: Provided is a fuel-cell system having a control device which controls driving of a first fuel supply device and a second fuel supply device. The control device includes, a driving-interval setting unit which sets first driving intervals for the first fuel supply device and second driving intervals for the second fuel supply device, a first fuel-supply-device control unit which sets valve-open durations of the first fuel supply device according to the first driving intervals, and a second fuel-supply-device control unit which sets valve-open durations of the second fuel supply device according to the second driving intervals. The driving-interval setting unit sets the second driving intervals to be shorter than the first driving intervals.

Abstract: A method of starting operation of a fuel cell stack includes the steps of performing gas replacement by supplying a fuel gas to a fuel gas flow field from a downstream side of the fuel gas flow field through a fuel gas discharge passage, and supplying an oxygen-containing gas to an oxygen-containing gas flow field from an upstream side of the oxygen-containing gas flow field through an oxygen-containing gas supply passage. After the step of performing gas replacement, normal power generation is carried out by supplying the fuel gas to the fuel gas flow field from an upstream side of the fuel gas flow field through a fuel gas supply passage, and supplying the oxygen-containing gas to the oxygen-containing gas flow field from the upstream side of the oxygen-containing gas flow field through the oxygen-containing gas supply passage.

Abstract: Provided is a fuel cell system capable of achieving both of improving purge efficiency and preventing deterioration of the fuel cell, and a control method of the fuel cell system. The fuel cell system includes a circulation rate adjusting unit that adjusts a circulation rate of a circulation gas, a first startup purge unit that performs the first startup purge by opening a purge valve in a state where the circulation rate of the circulation gas is increased to be a mixing promotion rate capable of promoting mixing of the fuel gas with the circulation gas at system startup of the fuel cell system, and a second startup purge unit that performs the second startup purge by opening the purge valve in a state where the gas circulation rate is reduced to be less than the mixing promotion rate after the first startup purge.

Abstract: Provided is a fuel-cell system having a control device which controls driving of a first fuel supply device and a second fuel supply device. The control device includes, a driving-interval setting unit which sets first driving intervals for the first fuel supply device and second driving intervals for the second fuel supply device, a first fuel-supply-device control unit which sets valve-open durations of the first fuel supply device according to the first driving intervals, and a second fuel-supply-device control unit which sets valve-open durations of the second fuel supply device according to the second driving intervals. The driving-interval setting unit sets the second driving intervals to be shorter than the first driving intervals.

Abstract: A fuel cell system that can supply fuel gas appropriately is provided. The fuel cell system includes an injector 23A and an injector 23B which inject fuel gas, and an ECU 50. The ECU 50 adjusts the flow rate of the fuel gas that is injected from the injector 23A by adjusting the valve opening time period and the valve closing time period of the injector 23A, which are repeated alternately, and make at least a part of the valve opening time period of the injector 23B overlap with the valve closing time period of the injector 23A when opening the valve of the injector 23B.

Abstract: A fuel gas supply apparatus of a fuel cell system includes a pressure reducing valve, an interruption valve, and an injector in a hydrogen supply channel. A controller of the fuel cell system includes a drive cycle setting unit for setting the drive cycle of the injector based on a load of the fuel cell stack, and a water state determination unit for determining whether or not quantity of water content in the fuel cell is excessive by determining whether or not the quantity of water content is a predetermined quantity or more.

Abstract: A fuel cell stack is provided with a pair of refrigerant inlet ports and a pair of refrigerant outlet ports. The refrigerant inlet ports are disposed in the vicinity of an oxidant gas inlet port and a fuel gas inlet port in a manner such that one of the refrigerant inlet ports is disposed on the side of the oxidant gas inlet port and the other refrigerant inlet port is disposed on the side of the fuel gas inlet port. The refrigerant outlet ports are disposed in the vicinity of an oxidant gas outlet port and a fuel gas outlet port in a manner such that one of the refrigerant outlet ports is disposed on the side of the oxidant gas outlet port and the other refrigerant outlet port is disposed on the side of the fuel gas outlet port.

Abstract: A method of starting operation of a fuel cell stack includes the steps of performing gas replacement by supplying a fuel gas to a fuel gas flow field from a downstream side of the fuel gas flow field through a fuel gas discharge passage, and supplying an oxygen-containing gas to an oxygen-containing gas flow field from an upstream side of the oxygen-containing gas flow field through an oxygen-containing gas supply passage. After the step of performing gas replacement, normal power generation is carried out by supplying the fuel gas to the fuel gas flow field from an upstream side of the fuel gas flow field through a fuel gas supply passage, and supplying the oxygen-containing gas to the oxygen-containing gas flow field from the upstream side of the oxygen-containing gas flow field through the oxygen-containing gas supply passage.