Method for the on-board functional diagnosis of a soot sensor in a motor vehicle and/or for the detection of further constituents in the soot
First Claim
1. A method for at least one of on-vehicle functional diagnosis of a soot sensor and detecting further components in exhaust of an internal combustion engine, the soot sensor comprising:
- a substrate;
a heating element configured to heat the substrate of the soot sensor;
a temperature sensor configured to detect a temperature of the soot sensor;
a structure arranged on the substrate comprising measurement electrodes configured as a comb-type electrode structure; and
an evaluation circuit electrically coupled to the soot sensor, the method comprising;
measuring a temperature coefficient of the soot sensor; and
detecting, based on the temperature coefficient, at least one of;
a defectiveness of the soot sensor anda presence of further components in the exhaust.
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Accused Products
Abstract
A method for on-vehicle functional diagnosis of a soot sensor and/or for detecting further components in the soot in a motor vehicle having an internal combustion engine, the soot sensor connected electrically to an evaluation circuit. To specify a method for functional diagnosis of a soot sensor and/or for detecting further components in the soot, by which it is possible to detect a faulty soot sensor and/or further components in the soot in an economical manner, the evaluation circuit measures a temperature coefficient of the soot sensor and detects the faultiness of the soot sensor and/or the presence of further components in the soot from the temperature coefficient of the soot sensor.
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Citations
11 Claims
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1. A method for at least one of on-vehicle functional diagnosis of a soot sensor and detecting further components in exhaust of an internal combustion engine, the soot sensor comprising:
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a substrate; a heating element configured to heat the substrate of the soot sensor; a temperature sensor configured to detect a temperature of the soot sensor; a structure arranged on the substrate comprising measurement electrodes configured as a comb-type electrode structure; and an evaluation circuit electrically coupled to the soot sensor, the method comprising; measuring a temperature coefficient of the soot sensor; and detecting, based on the temperature coefficient, at least one of; a defectiveness of the soot sensor and a presence of further components in the exhaust. - View Dependent Claims (2, 3, 4)
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5. A soot sensor comprising:
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a heating element configured to heat a substrate of the soot sensor; a temperature sensor configured to detect a temperature of the soot sensor; a structure arranged on the substrate comprising measurement electrodes configured as a comb-type electrode structure; and an evaluation circuit electrically coupled to the soot sensor, the evaluation circuit configured to; measure a temperature coefficient of the soot sensor; and detect, based on the temperature coefficient, at least one of; a defectiveness of the soot sensor and a presence of further components in the exhaust.
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6. An evaluation circuit for on-vehicle functional diagnosis of a soot sensor permanently installed in a motor vehicle having an internal combustion engine, the evaluation circuit configured to at least one of functionally diagnose the soot sensor and detect further components in the soot, the soot sensor being electrically connected to the evaluation circuit, wherein the evaluation circuit is configured to:
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measure a temperature coefficient of the soot sensor and detect at least one of; a defectiveness of the soot sensor and further components in the soot from the temperature coefficient. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification