Fuel cell system
First Claim
1. A fuel cell system comprising:
- a fuel cell having output terminals;
a voltage converter that is connected to said output terminals of said fuel cell;
an electrical storage device that is connected in parallel to said fuel cell via said voltage converter and is capable of power charging and discharging;
a current detector that detects a current value of said fuel cell; and
a current offset correction value determination device that determines a current offset correction value for said current detector by setting an output terminal voltage of said fuel cell to an open circuit voltage via said voltage converter, whereinsaid fuel cell system is mounted in a moving object, said current offset correction value determination device determines said current offset correction value by setting the output terminal voltage of said fuel cell to the open circuit voltage during a period that the moving object does not require power generation by said fuel cell.
1 Assignment
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Accused Products
Abstract
The measurement precision of a current detector of the fuel cell in a fuel cell system is improved. Where the fuel cell system 20 has not started operation, the vehicle 10 is operating under regenerative operation, the fuel cell 21 is operating under intermittent operation, or operation of the fuel cell system 20 has ended, the output terminal voltage of the fuel cell 21 is set to the OCV value of 400V via the DC/DC converter 31. As a result, even where the status of the fuel cell 21 changes from operating to stopped, the value of the current flowing over the power supply lines 411 can be immediately and reliably set to 0 A. The control unit 60 then obtains the current value Ad from the fuel cell current sensor 413 (step S150), and determines the offset correction value Ac needed in order to cancel the drift amount (i.e., in order to perform zero-point correction).
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Citations
6 Claims
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1. A fuel cell system comprising:
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a fuel cell having output terminals; a voltage converter that is connected to said output terminals of said fuel cell; an electrical storage device that is connected in parallel to said fuel cell via said voltage converter and is capable of power charging and discharging; a current detector that detects a current value of said fuel cell; and a current offset correction value determination device that determines a current offset correction value for said current detector by setting an output terminal voltage of said fuel cell to an open circuit voltage via said voltage converter, wherein said fuel cell system is mounted in a moving object, said current offset correction value determination device determines said current offset correction value by setting the output terminal voltage of said fuel cell to the open circuit voltage during a period that the moving object does not require power generation by said fuel cell. - View Dependent Claims (2, 3, 4)
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5. A fuel cell system comprising:
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a fuel cell having output terminals; a current detector that detects a current value of said fuel cell; and a current offset correction value determination device that determines a current offset correction value for said current detector by setting an output terminal voltage of said fuel cell to an open circuit voltage, wherein said fuel cell system is mounted in a moving object, said current offset correction value determination device determines said current offset correction value by setting the output terminal voltage of said fuel cell to the open circuit voltage during a period that the moving object does not require power generation by said fuel cell.
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6. A method of determining a current offset correction value for a current detector in a fuel cell system including an electrical storage device that is connected in parallel to a fuel cell via a voltage converter, wherein the voltage converter is connected to output terminals of such fuel cell, the method comprising:
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setting an output terminal voltage of said fuel cell to an open circuit voltage via said voltage converter; and determining the current offset correction value for said current detector, wherein the fuel cell system is mounted in a moving object and the current offset correction value is determined by setting the output terminal voltage of said fuel cell to the open circuit voltage during a period that the moving object does not require power generation by said fuel cell.
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Specification