METHOD FOR CONTROLLING FUEL CELL SYSTEM
First Claim
1. A method for controlling a fuel cell system,the fuel cell system includinga fuel cell that includes a membrane electrode assembly in which a solid polymer electrolyte membrane is sandwiched between an anode electrode and a cathode electrode and that generates electric power by causing an electrochemical reaction between a fuel gas that is supplied through a fuel gas supply channel to the anode electrode and an oxidant gas that is supplied through an oxidant gas supply channel to the cathode electrode,an oxidant gas supply mechanism that includes a rotational driving unit and that supplies the oxidant gas to the oxidant gas supply channel as the rotational driving unit rotates,a humidifier that moistens the oxidant gas supplied from the oxidant gas supply mechanism,a bypass channel that branches off from the oxidant gas supply channel and that bypasses the humidifier,a bypass channel valve that is disposed in the bypass channel and that closes or opens the bypass channel, andan impedance measuring unit that measures an impedance of the fuel cell,the method comprising:
- operating the bypass channel valve by performing feedforward control so as to close the bypass channel to a predetermined opening degree when the impedance measured by the impedance measuring unit has reached a predetermined lower limit value, and operating the bypass channel valve by performing feedforward control so as to open the bypass channel to a predetermined opening degree when the impedance measured by the impedance measuring unit has reached a predetermined upper limit value, so that the impedance is between the lower limit value and the upper limit value.
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Accused Products
Abstract
A method for controlling a fuel cell system includes supplying an oxidant gas, via an oxidant gas supply channel, to a cathode electrode of a fuel cell. The oxidant gas is moistened to be supplied to the cathode electrode with a humidifier. An opening degree of a bypass channel valve is decreased via a feedforward control to a first opening degree when an impedance has reached a lower limit value. The opening degree of the bypass channel valve is increased via the feedforward control to a second opening degree when the impedance has reached an upper limit value. The first opening degree is smaller than the second opening degree.
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Citations
16 Claims
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1. A method for controlling a fuel cell system,
the fuel cell system including a fuel cell that includes a membrane electrode assembly in which a solid polymer electrolyte membrane is sandwiched between an anode electrode and a cathode electrode and that generates electric power by causing an electrochemical reaction between a fuel gas that is supplied through a fuel gas supply channel to the anode electrode and an oxidant gas that is supplied through an oxidant gas supply channel to the cathode electrode, an oxidant gas supply mechanism that includes a rotational driving unit and that supplies the oxidant gas to the oxidant gas supply channel as the rotational driving unit rotates, a humidifier that moistens the oxidant gas supplied from the oxidant gas supply mechanism, a bypass channel that branches off from the oxidant gas supply channel and that bypasses the humidifier, a bypass channel valve that is disposed in the bypass channel and that closes or opens the bypass channel, and an impedance measuring unit that measures an impedance of the fuel cell, the method comprising: operating the bypass channel valve by performing feedforward control so as to close the bypass channel to a predetermined opening degree when the impedance measured by the impedance measuring unit has reached a predetermined lower limit value, and operating the bypass channel valve by performing feedforward control so as to open the bypass channel to a predetermined opening degree when the impedance measured by the impedance measuring unit has reached a predetermined upper limit value, so that the impedance is between the lower limit value and the upper limit value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for controlling a fuel cell system, comprising:
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supplying an oxidant gas, via an oxidant gas supply channel, to a cathode electrode of a fuel cell that includes a membrane electrode assembly including a solid polymer electrolyte membrane which is sandwiched between an anode electrode and the cathode electrode; supplying a fuel gas to the anode electrode of the fuel cell to generate electric power via an electrochemical reaction between the fuel gas and the oxidant gas; moistening the oxidant gas to be supplied to the cathode electrode with a humidifier provided in the oxidant gas supply channel; measuring an impedance of the fuel cell; decreasing an opening degree of a bypass channel valve via a feedforward control to a first opening degree when the impedance has reached a lower limit value, the bypass channel valve being provided in a bypass channel that bypasses the humidifier; and increasing the opening degree of the bypass channel valve via the feedforward control to a second opening degree when the impedance has reached an upper limit value, the first opening degree being smaller than the second opening degree. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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Specification