Abstract: A fuel cell system includes a control unit that detects an abnormality of a flow dividing valve provided in a bypass channel for an oxidation gas by using a detected opening degree detected by a valve opening degree detection sensor that detects the opening degree of the flow dividing valve. When the detected abnormality is an opening abnormality that is failure to open and the flow dividing valve can close, the control unit sends a closing command for making the opening degree smaller than a current opening degree to a valve driving motor. Either when the detected abnormality is a closing abnormality that is failure to close and the flow dividing valve can open or when the detected abnormality is an opening-closing abnormality that is failure both to close and to open, the control unit sends a maintaining command for maintaining the opening degree to the valve driving motor.

Abstract: A fuel cell system includes: a fuel cell; a first valve device provided at an oxidation gas supply channel; a second valve device provided at an oxidation off-gas discharge channel; a third valve device provided at a bypass channel; an abnormality detection unit configured to detect an abnormality; and a control unit. The control unit causes the fuel cell to initiate fail-safe power generation if (i) a different abnormality from a valve opening abnormality is detected in the first valve device, (ii) the different abnormality is detected in the second valve device, or (iii) any abnormality is detected in the third valve device. During the fail-safe power generation, if any abnormality is additionally detected in any valve device different from the valve device in which an abnormality is already detected, the control unit stops power generation by the fuel cell.

Abstract: A control device of a fuel cell system does not execute feedback control of an air valve in a case where a first condition in which a valve opening degree command value calculated by the control device is less than a command value threshold and a second condition in which a valve opening degree measurement value measured by an air valve opening degree sensor is less than a measurement value threshold are satisfied, and executes the feedback control of the air valve in a case where the first condition or the second condition is not satisfied.

Abstract: A fuel cell system includes: a fuel cell; a first valve device provided at an oxidation gas supply channel; a second valve device provided at an oxidation off-gas discharge channel; a third valve device provided at a bypass channel; an abnormality detection unit configured to detect an abnormality; and a control unit. The control unit causes the fuel cell to initiate fail-safe power generation if (i) a different abnormality from a valve opening abnormality is detected in the first valve device, (ii) the different abnormality is detected in the second valve device, or (iii) any abnormality is detected in the third valve device. During the fail-safe power generation, if any abnormality is additionally detected in any valve device different from the valve device in which an abnormality is already detected, the control unit stops power generation by the fuel cell.

Abstract: A fuel cell system includes a control unit that detects an abnormality of a flow dividing valve provided in a bypass channel for an oxidation gas by using a detected opening degree detected by a valve opening degree detection sensor that detects the opening degree of the flow dividing valve. When the detected abnormality is an opening abnormality that is failure to open and the flow dividing valve can close, the control unit sends a closing command for making the opening degree smaller than a current opening degree to a valve driving motor. Either when the detected abnormality is a closing abnormality that is failure to close and the flow dividing valve can open or when the detected abnormality is an opening-closing abnormality that is failure both to close and to open, the control unit sends a maintaining command for maintaining the opening degree to the valve driving motor.

Abstract: A control device of a fuel cell system does not execute feedback control of an air valve in a case where a first condition in which a valve opening degree command value calculated by the control device is less than a command value threshold and a second condition in which a valve opening degree measurement value measured by an air valve opening degree sensor is less than a measurement value threshold are satisfied, and executes the feedback control of the air valve in a case where the first condition or the second condition is not satisfied.