Drift compensation for an impedimetric exhaust gas sensor by variable bias voltage
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Abstract
An exhaust gas sensor is proposed for detecting a gas component in the exhaust gas of an internal combustion engine, having a control and evaluation unit and a sensor unit with an electrode structure with a first terminal and a second terminal, and a method for operating an exhaust gas sensor to determine the concentration of a gas component in the exhaust gas of an internal combustion engine is also proposed. The control and evaluation unit applies a bias voltage to the first terminal and/or the second terminal of the electrode structure, it being possible for the level of the bias voltage to be set in dependence on a characteristic of the sensor and/or in dependence on a loading of the sensor. A bias voltage is applied to the first terminal and/or to the second terminal of the electrode structure, with the level of the bias voltage being set in dependence on a characteristic of the sensor and/or in dependence on a loading of the sensor.
23 Citations
35 Claims
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1-14. -14. (canceled)
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15. A gas sensor for detecting a gas component in the exhaust gas of an internal combustion engine, comprising:
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a control and evaluation unit, and a sensor unit with an electrode structure, a first terminal, and a second terminal, wherein an electrical measured value present between the first terminal and the second terminal of the electrode structure is adapted to be supplied to the control and evaluation unit to determine the concentration of the gas component, wherein the control and evaluation unit applies a bias voltage to at least one of the first terminal and the second terminal of the electrode structure, wherein the bias voltage has a level which is settable in dependence on at least one of a characteristic of the sensor and a loading of the sensor in such a way that sensor behavior with long-term stability is achieved over the operating time. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for operating an exhaust gas sensor to determine a concentration of a gas component in exhaust gas of an internal combustion engine, the exhaust gas sensor including a gas-sensitive sensor unit with an electrode structure with a first terminal and a second terminal, an electrical measured variable correlating with the concentration of the gas component being picked up between the first terminal and the second terminal of the electrode structure, comprising:
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applying a bias voltage to at least one of the first and second terminals of the electrode structure, setting a level of the bias voltage in dependence on at least one of a characteristic of the sensor and a loading of the sensor in such a way that sensor behavior with long-term sensor stability is achieved over an operating time. - View Dependent Claims (30, 31, 32, 33, 34, 35)
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Specification