Power supply system and control method of the same
First Claim
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1. A control method of a power supply system in which a fuel cell and a battery are connected in parallel by a power supply wiring, comprising the steps of:
- activating the fuel cell, which has stopped generating electric power, in response to a request to apply a load which is larger than zero to the fuel cell;
obtaining a load requirement that indicates electric power that is required by the power supply system;
measuring a time which has elapsed since the fuel cell was activated;
obtaining information regarding an amount of fuel actually supplied to the fuel cell;
comparing the elapsed time with a predetermined reference time;
setting a target electric power which needs to be output from the fuel cell based on the obtained load requirement without considering the obtained information regarding the amount of the fuel actually supplied to the fuel cell when it is determined that the elapsed time is equal to or shorter than the reference time; and
setting the target electric power which needs to be output from the fuel cell in accordance with the obtained information regarding the amount of the fuel actually supplied to the fuel cell when it is determined that the elapsed time exceeds the reference time.
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Abstract
A power supply unit operation is switched depending on a load requirement. Namely, when the load requirement is smaller than a predetermined value, operation of a fuel cell system is stopped and electric power is obtained from a secondary battery during an intermittent operation mode. Alternatively, when the load requirement is equal to or larger than the predetermined value, the electric power is obtained from a fuel cell during a steady operation mode.
15 Citations
8 Claims
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1. A control method of a power supply system in which a fuel cell and a battery are connected in parallel by a power supply wiring, comprising the steps of:
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activating the fuel cell, which has stopped generating electric power, in response to a request to apply a load which is larger than zero to the fuel cell; obtaining a load requirement that indicates electric power that is required by the power supply system; measuring a time which has elapsed since the fuel cell was activated; obtaining information regarding an amount of fuel actually supplied to the fuel cell; comparing the elapsed time with a predetermined reference time; setting a target electric power which needs to be output from the fuel cell based on the obtained load requirement without considering the obtained information regarding the amount of the fuel actually supplied to the fuel cell when it is determined that the elapsed time is equal to or shorter than the reference time; and setting the target electric power which needs to be output from the fuel cell in accordance with the obtained information regarding the amount of the fuel actually supplied to the fuel cell when it is determined that the elapsed time exceeds the reference time. - View Dependent Claims (2)
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3. A power supply system, comprising:
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a fuel cell; a battery which is connected to the fuel cell in parallel by power supply wiring; a load requirement obtaining portion which obtains a load requirement that indicates electric power required of the power supply system; an elapsed time measuring portion which measures time that has elapsed since the fuel cell was activated, prior to the fuel cell having been activated, the fuel cell being in a state in which the fuel cell has stopped generating electric power, the fuel cell having been activated in response to a request to apply a load which is larger than zero to the fuel cell; a supplied fuel amount detecting portion which detects an amount of fuel that is supplied to the fuel cell; a target power setting portion which sets a target electric power that needs to be output from the fuel cell; and a control portion which controls the fuel cell such that the fuel cell outputs the target electric power that is set by the target power setting portion, wherein the target power setting portion sets (i) the target electric power based on the obtained load requirement without considering the detected amount of the fuel that is supplied to the fuel cell when the elapsed time which is measured by the elapsed time measuring portion is equal to or shorter than a predetermined reference time, and (ii) sets the target electric power based on the detected amount of the fuel that is supplied to the fuel cell when the elapsed time which is measured by the elapsed time measuring portion exceeds the predetermined reference time. - View Dependent Claims (4, 5, 6, 7, 8)
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Specification