Abstract: A fuel cell system includes: a fuel cell stack; an oxygen tank; an oxygen pipe connecting the fuel cell stack and the oxygen tank; an oxygen regulator disposed in the oxygen pipe and configured to regulate a flow rate of oxygen to be supplied from the oxygen tank to a cathode of the fuel cell stack; an oxygen stop valve disposed in the oxygen pipe; and a controller configured to execute, when activating or stopping the fuel cell stack: a first process of opening the oxygen stop valve and the oxygen regulator; a second process of closing the oxygen stop valve and the oxygen regulator when a cathode internal pressure reaches a predetermined first cathode pressure; and a third process of outputting a signal indicating occurrence of oxygen leakage when the cathode internal pressure after a predetermined period is lower than a predetermined second cathode pressure.

Abstract: A fuel cell system includes: a fuel cell stack; a fuel tank; a fuel pipe connecting the fuel cell stack and the fuel tank; a fuel regulator disposed in the fuel pipe and configured to regulate a flow rate of fuel gas to be supplied from the fuel tank to an anode; a fuel stop valve disposed in the fuel pipe; and a controller. The controller is configured to execute, when activating or stopping the fuel cell stack: a first process of opening the fuel stop valve and the fuel regulator; a second process of closing the fuel stop valve and the fuel regulator when an anode internal pressure reaches a predetermined first anode pressure; and a third process of outputting a signal indicating occurrence of fuel leakage when the anode internal pressure after a predetermined first period is lower than a predetermined second anode pressure.

Abstract: A fuel cell system includes: a fuel cell; a temperature acquisition unit that acquires a temperature at a specific position in a vehicle equipped with the fuel cell system; a purge unit that purges the fuel cell when an operation of the fuel cell is stopped; and a control unit that acquires the temperature at the specific position from the temperature acquisition unit at least once from when the fuel cell system is stopped until the fuel cell system is started again, and uses the temperature at the specific position to determine whether purging at a stop by the purge unit is necessary when the fuel cell system is stopped next.

Abstract: A fuel cell system includes a fuel cell, a hydrogen tank, a hydrogen supply passage connecting the hydrogen tank and the fuel cell, a cutoff valve configured to cut off circulation of hydrogen in the hydrogen supply passage, a detection unit configured to detect a start of filling of the hydrogen tank with hydrogen, and a purge controller configured to close the cutoff valve in a case where the fuel cell system is stopped and the detection unit detects the start of filling with hydrogen in a state in which purge processing of purging the in-cell hydrogen flow passage is to be executed, and to execute processing of purging the in-cell hydrogen flow passage by causing hydrogen remaining on a downstream side of the cutoff valve in a hydrogen flow in the hydrogen supply passage to flow in the in-cell hydrogen flow passage as the purge processing.

Abstract: A cooling water temperature of a fuel cell 10 is detected by a sensor 94d. Based on the outside air temperature, a first threshold temperature and a second threshold temperature lower than the first threshold temperature are calculated. When it is judged that the cooling water temperature is lower than the first threshold temperature and higher than the second threshold temperature, first warmup processing is performed. When it is judged that the cooling water temperature is lower than the second threshold temperature, second warmup processing with an amount of heat generation greater than the first warmup processing is performed.

Abstract: A fuel cell system includes: a fuel cell that is supplied with a reaction gas to generate electricity; a plurality of auxiliary components used for power generation of the fuel cell; and a control device that causes the fuel cell to generate electricity when a predetermined scavenging start condition is satisfied and controls the auxiliary components using electric power generated by the fuel cell to perform a scavenging process of removing water in a flow path of the reaction gas using the reaction gas, during a stop period in which electric power is not supplied to a load from the fuel cell system.

Abstract: A fuel cell system includes a fuel cell stack, a temperature measurement unit, and a controller. The controller is configured to, when the stack temperature is equal to or lower than a predetermined first threshold temperature at the time of startup of the fuel cell system, control a heat generation amount per unit time of the fuel cell stack to a set heat generation amount to perform a warming-up operation until the stack temperature increases to a target temperature, and when the stack temperature is equal to or higher than a predetermined second threshold temperature, execute at least one of setting the target temperature to be lower than the target temperature when the stack temperature is lower than the second threshold temperature and setting the set heat generation amount to be smaller than the set heat generation amount when the stack temperature is lower than the second threshold temperature.

Abstract: A fuel cell system includes a fuel cell a temperature acquisition unit that acquires a temperature of the fuel cell, a cell unit voltage sensor that detects a voltage of each of fuel cell units, and a controller that controls the fuel cell system. The controller restricts an output current of the fuel cell when the voltage of the individual fuel cell unit becomes equal to or lower than a predetermined value in a warm-up operation, execute the warm-up operation when the temperature of the fuel cell is equal to or lower than a predetermined temperature, after the fuel cell system receives a start-up request, and stop an operation of the fuel cell system when a stop condition including that the voltage of the fuel cell unit is continuously equal to or lower than a predetermined voltage value for a predetermined time is satisfied after start of the warm-up operation.

Abstract: A fuel cell system herein may include a battery configured to supply electric power to a fuel cell auxiliary device used for activating a fuel cell stack. When remaining electric energy in the battery is higher than an electric energy threshold upon activation of the fuel cell stack, a controller of the fuel cell system may start outputting current from the fuel cell stack after a fuel concentration in the fuel cell stack reaches a predetermined fuel concentration threshold, and when the remaining electric energy decreases below the electric energy threshold while the fuel concentration is being increased, the controller may start outputting current from the fuel cell stack regardless of the fuel concentration in the fuel cell stack. The current can be obtained from the fuel cell stack even when the remaining electric energy in the battery is low.

Abstract: A fuel cell system comprises: a gas-liquid separator separating exhaust gas of a fuel cell stack into a liquid component and a gas component and storing liquid water of the liquid component; a circulation pipe; a drain pipe discharging the liquid water; and a drain valve opening and closing the drain pipe. In an end scavenging process that is executed when operation of the fuel cell system is finished, the control unit opens the drain valve when a valve opening condition for the drain valve is satisfied. The valve opening condition is set such that an amount of the liquid water stored in the gas-liquid separator at the time the drain valve is opened in the end scavenging process is larger than an amount of the liquid water stored in the gas-liquid separator at the time the drain valve is opened during normal operation of the fuel cell system.

Abstract: Provided is a fuel cell system that can effectively suppress clogging of a pipe due to freezing of water in a fuel gas supply system thereof without the need for halting the operation of the fuel cells, and thus is highly reliable. When possible freezing of water is detected or presumed to be present downstream of an injector, the amount of a fuel gas to be supplied from a circulation pump that is disposed in a circulation channel is relatively increased compared to the amount of the fuel gas to be supplied from the injector.

Abstract: A fuel cell system includes: a fuel cell; a temperature acquisition unit that acquires a temperature at a specific position in a vehicle equipped with the fuel cell system; a purge unit that purges the fuel cell when an operation of the fuel cell is stopped; and a control unit that acquires the temperature at the specific position from the temperature acquisition unit at least once from when the fuel cell system is stopped until the fuel cell system is started again, and uses the temperature at the specific position to determine whether purging at a stop by the purge unit is necessary when the fuel cell system is stopped next.

Abstract: A fuel cell system includes: a fuel cell that is supplied with a reaction gas to generate electricity; a plurality of auxiliary components used for power generation of the fuel cell; and a control device that causes the fuel cell to generate electricity when a predetermined scavenging start condition is satisfied and controls the auxiliary components using electric power generated by the fuel cell to perform a scavenging process of removing water in a flow path of the reaction gas using the reaction gas, during a stop period in which electric power is not supplied to a load from the fuel cell system.

Abstract: A fuel cell system includes a fuel cell a temperature acquisition unit that acquires a temperature of the fuel cell, a cell unit voltage sensor that detects a voltage of each of fuel cell units, and a controller that controls the fuel cell system. The controller restricts an output current of the fuel cell when the voltage of the individual fuel cell unit becomes equal to or lower than a predetermined value in a warm-up operation, execute the warm-up operation when the temperature of the fuel cell is equal to or lower than a predetermined temperature, after the fuel cell system receives a start-up request, and stop an operation of the fuel cell system when a stop condition including that the voltage of the fuel cell unit is continuously equal to or lower than a predetermined voltage value for a predetermined time is satisfied after start of the warm-up operation.

Abstract: A fuel cell system includes a fuel cell stack, a temperature measurement unit, and a controller. The controller is configured to, when the stack temperature is equal to or lower than a predetermined first threshold temperature at the time of startup of the fuel cell system, control a heat generation amount per unit time of the fuel cell stack to a set heat generation amount to perform a warming-up operation until the stack temperature increases to a target temperature, and when the stack temperature is equal to or higher than a predetermined second threshold temperature, execute at least one of setting the target temperature to be lower than the target temperature when the stack temperature is lower than the second threshold temperature and setting the set heat generation amount to be smaller than the set heat generation amount when the stack temperature is lower than the second threshold temperature.

Abstract: A fuel cell system 1 is provided with a fuel cell 10 including a hydrogen passage 10h, a hydrogen supply path 31 connected to an inlet of a hydrogen passage, an injector 44 arranged in the hydrogen supply path, an anode off gas passage AP connected to an outlet of the hydrogen passage, and a drain control valve 46 provided in the anode off gas passage. Hydrogen replacement is performed in which the injector is opened so that a pressure inside the hydrogen passage becomes a required hydrogen pressure while the drain control valve is opened. The fuel cell system 1 is further provided with a pressure sensor 94a detecting the pressure inside the hydrogen passage. Hydrogen replacement is not performed when it is judged that the pressure inside the hydrogen passage is higher than the required hydrogen pressure.

Abstract: A fuel cell system herein may include a battery configured to supply electric power to a fuel cell auxiliary device used for activating a fuel cell stack. When remaining electric energy in the battery is higher than an electric energy threshold upon activation of the fuel cell stack, a controller of the fuel cell system may start outputting current from the fuel cell stack after a fuel concentration in the fuel cell stack reaches a predetermined fuel concentration threshold, and when the remaining electric energy decreases below the electric energy threshold while the fuel concentration is being increased, the controller may start outputting current from the fuel cell stack regardless of the fuel concentration in the fuel cell stack. The current can be obtained from the fuel cell stack even when the remaining electric energy in the battery is low.

Abstract: A cooling water temperature of a fuel cell 10 is detected by a sensor 94d. Based on the outside air temperature, a first threshold temperature and a second threshold temperature lower than the first threshold temperature are calculated. When it is judged that the cooling water temperature is lower than the first threshold temperature and higher than the second threshold temperature, first warmup processing is performed. When it is judged that the cooling water temperature is lower than the second threshold temperature, second warmup processing with an amount of heat generation greater than the first warmup processing is performed.

Abstract: A fuel cell system includes a fuel cell, a hydrogen tank, a hydrogen supply passage connecting the hydrogen tank and the fuel cell, a cutoff valve configured to cut off circulation of hydrogen in the hydrogen supply passage, a detection unit configured to detect a start of filling of the hydrogen tank with hydrogen, and a purge controller configured to close the cutoff valve in a case where the fuel cell system is stopped and the detection unit detects the start of filling with hydrogen in a state in which purge processing of purging the in-cell hydrogen flow passage is to be executed, and to execute processing of purging the in-cell hydrogen flow passage by causing hydrogen remaining on a downstream side of the cutoff valve in a hydrogen flow in the hydrogen supply passage to flow in the in-cell hydrogen flow passage as the purge processing.

Abstract: A fuel cell system comprises: a gas-liquid separator separating exhaust gas of a fuel cell stack into a liquid component and a gas component and storing liquid water of the liquid component; a circulation pipe; a drain pipe discharging the liquid water; and a drain valve opening and closing the drain pipe. In an end scavenging process that is executed when operation of the fuel cell system is finished, the control unit opens the drain valve when a valve opening condition for the drain valve is satisfied. The valve opening condition is set such that an amount of the liquid water stored in the gas-liquid separator at the time the drain valve is opened in the end scavenging process is larger than an amount of the liquid water stored in the gas-liquid separator at the time the drain valve is opened during normal operation of the fuel cell system.