Method and device for adapting signals of an oxygen sensor in the air supply channel of an internal combustion engine
First Claim
1. A method for evaluating signals of an oxygen sensor, the method comprising:
- obtaining sensor signals from the oxygen sensor in an air supply channel of an internal combustion engine, the air supply channel being connected to an exhaust gas channel of the internal combustion engine, via an exhaust gas recirculation which has at least one exhaust gas recirculation valve, the oxygen sensor being situated in the air supply channel downstream from the exhaust gas recirculation initiation;
correcting the sensor signals as a function of at least one characteristics variable, which describes the dependence of the sensor signals on at least one of (i) one of an oxygen concentration and a variable correlated with the oxygen concentration, and (ii) at least one additional physical variable;
at at least one operating point of the internal combustion engine, in response to a closed exhaust gas recirculation valve, outputting signals of the oxygen sensor, and recording and storing the signals and additional operating point parameters; and
deriving an adaptation of the characteristics variables of the oxygen sensor, based on the assumption that the gas composition corresponds to that of pure air.
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Abstract
A method/device for evaluating oxygen sensor signals of an air supply channel connected to an exhaust gas channel of the internal combustion engine, via an exhaust gas recirculation having at least one exhaust gas recirculation valve; the oxygen sensor being downstream from the exhaust gas recirculation initiation; the sensor signal(s) being corrected as a function of at least one characteristics variable describing the dependence of the sensor signal on the oxygen concentration or a correlated variable, and/or additional physical variables. At at least one engine operating point(s), in response to a closed exhaust gas recirculation valve, output oxygen sensor signals and additional operating point parameters are recorded/stored; and an adaptation of the characteristic variables is derived assuming that the gas composition corresponds to pure air. Also, a characteristics curve adjustment and a compensation of pressure temperature dependencies may be performed to improve the accuracy of the oxygen sensor signals.
19 Citations
13 Claims
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1. A method for evaluating signals of an oxygen sensor, the method comprising:
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obtaining sensor signals from the oxygen sensor in an air supply channel of an internal combustion engine, the air supply channel being connected to an exhaust gas channel of the internal combustion engine, via an exhaust gas recirculation which has at least one exhaust gas recirculation valve, the oxygen sensor being situated in the air supply channel downstream from the exhaust gas recirculation initiation; correcting the sensor signals as a function of at least one characteristics variable, which describes the dependence of the sensor signals on at least one of (i) one of an oxygen concentration and a variable correlated with the oxygen concentration, and (ii) at least one additional physical variable; at at least one operating point of the internal combustion engine, in response to a closed exhaust gas recirculation valve, outputting signals of the oxygen sensor, and recording and storing the signals and additional operating point parameters; and deriving an adaptation of the characteristics variables of the oxygen sensor, based on the assumption that the gas composition corresponds to that of pure air. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device for evaluating signals of an oxygen sensor, comprising:
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an engine control unit having a storage arrangement for storing output signals from the oxygen sensor and operating point parameters and having a processor arrangement for determining and applying correction quantities for at least one characteristics variable of the oxygen sensor, wherein the oxygen sensor is in an air supply channel of an internal combustion engine, the air supply channel being connected to an exhaust gas channel of the internal combustion engine, via an exhaust gas recirculation which has at least one exhaust gas recirculation valve, the oxygen sensor being situated in the air supply channel downstream from the exhaust gas recirculation initiation; wherein the processor arrangement is adapted to correct the sensor signals as a function of the at least one characteristics variable, which describes the dependence of the sensor signals on at least one of (i) one of an oxygen concentration and a variable correlated with the oxygen concentration, and (ii) at least one additional physical variable, wherein at at least one operating point of the internal combustion engine, in response to a closed exhaust gas recirculation valve, signals of the oxygen sensor are output and the signals and additional operating point parameters are recorded and stored by the engine control unit, and wherein the processor arrangement derives an adaptation of the characteristics variables of the oxygen sensor, based on the assumption that the gas composition corresponds to that of pure air. - View Dependent Claims (13)
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Specification