Method and Apparatus for Diagnosing Electrochemical Sensor
First Claim
1. A method for diagnosing an electrochemical sensor comprising a solid or liquid electrolyte between a sensing electrode with which a gas to be detected makes contact and an opposite electrode, wherein the concentration of the gas to be detected is detected on the basis of a current flowing between the sensing electrode and the opposite electrode, or a voltage corresponding to the current, the method comprising the step of:
- diagnosing whether or not the electrochemical sensor is in an error state on the basis of a resistance of the electrolyte.
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Abstract
A method and apparatus for diagnosing an electrochemical sensor that detects the concentration of a gas are operative for diagnosing whether or not the sensor is in an error state due to a rise in a resistance in the electrolyte of the sensor. Such detection is made on the basis of a current flowing between a sensing electrode and an opposite electrode or a voltage corresponding to the current. A method for diagnosing an electrochemical sensor having a solid or liquid electrolyte between a sensing electrode and an opposite electrode detects the concentration of the gas to be detected on the basis of a current flowing between the sensing electrode and the opposite electrode, or a voltage corresponding to the current. Whether or not the electrochemical sensor is in an error state is diagnosed on the basis of a resistance of the electrolyte between the two electrodes of the electrolyte.
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Citations
12 Claims
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1. A method for diagnosing an electrochemical sensor comprising a solid or liquid electrolyte between a sensing electrode with which a gas to be detected makes contact and an opposite electrode, wherein the concentration of the gas to be detected is detected on the basis of a current flowing between the sensing electrode and the opposite electrode, or a voltage corresponding to the current, the method comprising the step of:
diagnosing whether or not the electrochemical sensor is in an error state on the basis of a resistance of the electrolyte. - View Dependent Claims (2, 3, 4, 5, 6, 11, 12)
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7. An apparatus for diagnosing an electrochemical sensor comprising a solid or liquid electrolyte between a sensing electrode with which a gas to be detected makes contact and an opposite electrode, wherein the concentration of the gas to be detected is detected on the basis of a current flowing between the sensing electrode and the opposite electrode, or a voltage corresponding to the current, the apparatus comprising:
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detecting means for detecting a resistance of the electrolyte; and diagnosing means for diagnosing whether or not the electrochemical sensor is in an error state on the basis of the resistance of the electrolyte detected by the detecting means. - View Dependent Claims (8, 9, 10)
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Specification