Apparatus and method for correcting offset of pressure sensor in fuel cell system
AssigneesHyundai Motor Company, Kia Corporation
InventorsSang Wook Han, Jae Won Jung
Life of this patent
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Abstract
Introduced are an apparatus for correcting an offset of a pressure sensor in a fuel cell system including a first pressure sensor and a second pressure sensor, which are installed between a rear end of a fuel supply valve of a hydrogen supply system and an anode inlet, and a method of correcting an offset using the same. The apparatus includes an offset corrector that calculates offsets between the sensors from a condition of same pressure of each of the sensors and corrects offsets with respect to the first pressure sensor and the second pressure sensor using the calculated offsets.
Claims16
A method of correcting an offset of a pressure sensor in a fuel cell system comprising a first pressure sensor and a second pressure sensor, which are installed between a rear end of a fuel supply valve of a hydrogen supply system and an anode inlet, the method comprising:
- determining whether pressure at a position of the first pressure sensor and pressure at a position of the second pressure sensor are equal to each other in a closed state of the fuel supply valve;
- when determined to be an equal pressure to each other, calculating a first offset from a difference between a detected pressure value of the first pressure sensor and a detected pressure value of the second pressure sensor;
- determining whether the pressure at the position of the second pressure sensor is equal to atmospheric pressure by opening a fuel exhaust valve;
- when determined that the pressure at the position of the second pressure sensor is equal to the atmospheric pressure, calculating a second offset from a difference between a detected pressure value of an atmospheric pressure sensor and a detected pressure value of the second pressure sensor in a state in which the fuel exhaust valve is closed;
- and correcting offsets of the first pressure sensor and the second pressure sensor using the first offset and the second offset wherein the first pressure sensor is a gauge pressure sensor, and the second pressure sensor is an absolute pressure sensor, and wherein the first pressure sensor is a nozzle pressure sensor located between the fuel supply valve and an ejector, and the second pressure sensor is an anode pressure sensor located between a rear end of the ejector and the anode inlet.
An apparatus for correcting an offset of a pressure sensor in a fuel cell system comprising a first pressure sensor and a second pressure sensor, which are installed between a rear end of a fuel supply valve of a hydrogen supply system and an anode inlet, the apparatus comprising an offset corrector for correcting an offset with respect to the first pressure sensor and an offset with respect to the second pressure sensor,
- wherein the offset corrector is configured to:
- when pressure at a position of the first pressure sensor and pressure at a position of the second pressure sensor are equal to each other in a closed state of the fuel supply valve, calculate a first offset from a difference between a detected pressure value of the first pressure sensor and a detected pressure value of the second pressure sensor,
- when the pressure at the position of the second pressure sensor is equal to atmospheric pressure by opening a fuel exhaust valve connected on an exhaust side, calculate a second offset from a difference between a detected pressure value of an atmospheric pressure sensor and a detected pressure value of the second pressure sensor in a state in which the fuel exhaust valve is closed, and
- correct offsets of the first pressure sensor and the second pressure sensor using the calculated first and second offsets,
- wherein the first pressure sensor is a gauge pressure sensor, and the second pressure sensor is an absolute pressure sensor, and
- wherein the first pressure sensor is a nozzle pressure sensor located between the fuel supply valve and an ejector, and the second pressure sensor is an anode pressure sensor located between a rear end of the ejector and the anode inlet.
Dependencies are inferred from the claim text.