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US 12,012,881 B2Granted
Determining a sensor error of a sensor in an exhaust gas system of a motor vehicle
AssigneeBayerische Motoren Werke Aktiengesellschaft
InventorsMarius Becker, Daniel Brueckner, Klemens Schuerholz
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Abstract
A method determines a sensor error of a sensor in an exhaust gas system of a motor vehicle. One step of the method involves determining at least one actual sensor signal of the sensor. Another step of the method involves determining at least one target sensor signal of the sensor by means of a model. A further step of the method involves determining the sensor error of the sensor according to a deviation between the actual sensor signal of the sensor and the target sensor signal of the sensor.
Claims8
A method for identifying a sensor fault of a sensor for an exhaust-gas system of a motor vehicle, the method comprising the steps of:
- determining at least one actual sensor signal of the sensor;
- determining at least one setpoint sensor signal of the sensor by way of at least one fault model;
- and
- identifying the sensor fault of the sensor in a manner dependent on a deviation between the actual sensor signal of the sensor and the setpoint sensor signal of the sensor, wherein the at least one fault model comprises at least one of the following fault models:
- (i) time delay of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a rich mixture to a lean mixture, and no time delay of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a lean mixture to a rich mixture,
- (ii) time delay of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a lean mixture to a rich mixture, and no time delay of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a rich mixture to a lean mixture,
- (iii) low-pass filtering of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a rich mixture to a lean mixture, and no low-pass filtering of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a lean mixture to a rich mixture,
- (iv) low-pass filtering of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a lean mixture to a rich mixture, and no low-pass filtering of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a rich mixture to a lean mixture,
- (v) time delay of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a lean mixture to a rich mixture, and time delay of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a rich mixture to a lean mixture, or
- (vi) low-pass filtering of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a lean mixture to a rich mixture, and low-pass filtering of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a rich mixture to a lean mixture.
7 more elements
A device for identifying a sensor fault of a sensor in an exhaust-gas system of a motor vehicle, comprising:
- a processor and associated memory configured to:
- receive at least one actual sensor signal of the sensor,
- determine at least one setpoint sensor signal of the sensor by way of at least one fault model, and
- identify the sensor fault of the sensor in a manner dependent on a deviation between the actual sensor signal of the sensor and the setpoint sensor signal of the sensor, wherein the at least one fault model comprises at least one of the following fault models:
- (i) time delay of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a rich mixture to a lean mixture, and no time delay of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a lean mixture to a rich mixture,
- (ii) time delay of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a lean mixture to a rich mixture, and no time delay of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a rich mixture to a lean mixture,
- (iii) low-pass filtering of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a rich mixture to a lean mixture, and no low-pass filtering of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a lean mixture to a rich mixture,
- (iv) low-pass filtering of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a lean mixture to a rich mixture, and no low-pass filtering of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a rich mixture to a lean mixture,
- (v) time delay of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a lean mixture to a rich mixture, and time delay of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a rich mixture to a lean mixture, or
- (vi) low-pass filtering of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a lean mixture to a rich mixture, and low-pass filtering of the actual sensor signal relative to the setpoint sensor signal in the event of a change of the combustion air ratio from a rich mixture to a lean mixture.
7 more elements
Dependencies are inferred from the claim text.