Fuel cell system and vehicle equipped with the same
First Claim
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1. A fuel cell system comprising:
- a fuel cell having catalyst, for performing power generation by inducing reaction of oxygen or hydrogen at the catalyst;
a gas supply unit for supplying at least one of the oxygen and the hydrogen to the fuel cell;
an energy storage device in which an output voltage thereof changes depending on an amount of electric power stored in the energy storage device;
a voltage regulator provided in parallel to the fuel cell, and in series with the energy storage device for regulating an output voltage of the fuel cell;
a load driven by electric power outputted from the fuel cell; and
a means for detecting an electric power required by the load and controlling the fuel cell, the gas supply unit, and the voltage regulator to place the voltage regulator in a direct connection state and to regulate a concentration of the oxygen or the hydrogen supplied to the fuel cell in accordance with a target electric power for the power generation by the fuel cell determined based on the electric power required by the load when the output voltage of the energy storage device is outside a voltage range of the fuel cell where oxidation-reduction proceeds.
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Abstract
A fuel cell system and a fuel cell vehicle equipped with the fuel cell system are provided. In a case where the voltage of a battery is outside a voltage range of fuel cells where oxidation-reduction proceeds, an ECU controls a DC/DC converter to be placed in a direct connection state (Vbat≈Vfc), and controls a gas supply unit so as to regulate concentration of oxygen or hydrogen supplied to the fuel cells in accordance with a target power generation electric power determined based on electric power required by a load.
11 Citations
7 Claims
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1. A fuel cell system comprising:
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a fuel cell having catalyst, for performing power generation by inducing reaction of oxygen or hydrogen at the catalyst; a gas supply unit for supplying at least one of the oxygen and the hydrogen to the fuel cell; an energy storage device in which an output voltage thereof changes depending on an amount of electric power stored in the energy storage device; a voltage regulator provided in parallel to the fuel cell, and in series with the energy storage device for regulating an output voltage of the fuel cell; a load driven by electric power outputted from the fuel cell; and a means for detecting an electric power required by the load and controlling the fuel cell, the gas supply unit, and the voltage regulator to place the voltage regulator in a direct connection state and to regulate a concentration of the oxygen or the hydrogen supplied to the fuel cell in accordance with a target electric power for the power generation by the fuel cell determined based on the electric power required by the load when the output voltage of the energy storage device is outside a voltage range of the fuel cell where oxidation-reduction proceeds. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A fuel cell vehicle equipped with a fuel cell system, and including a motor driven by electric power outputted from a fuel cell, the fuel cell system comprising:
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the fuel cell having catalyst, for performing power generation by inducing reaction of oxygen or hydrogen at the catalyst; a gas supply unit for supplying at least one of the oxygen and the hydrogen to the fuel cell; an energy storage device in which an output voltage thereof changes depending on an amount of electric power stored in the energy storage device; a voltage regulator provided in parallel to the fuel cell, and in series with the energy storage device for regulating an output voltage of the fuel cell; and a means for detecting an electric power required by the load and controlling the fuel cell, the gas supply unit, and the voltage regulator to place the voltage regulator in a direct connection state and to regulate a concentration of the oxygen or the hydrogen supplied to the fuel cell in accordance with a target electric power for the power generation by the fuel cell determined based on the electric power required by the load when the output voltage of the energy storage device is outside a voltage range of the fuel cell where oxidation-reduction proceeds.
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Specification