Error analysis in a sensor
AssigneeVolkswagen Aktiengesellschaft
InventorsMathias Hauptvogel, Tom Padeken
Life of this patent
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Abstract
A method for analyzing a sensor with respect to unstable errors, wherein a gradient signal is generated based on a sensor signal. Based on the gradient signal, an evaluation unit is used to assign a slope category to a first slope of the sensor signal and a second slope of the sensor signal, the second slope following the first slope. The evaluation unit ascertains a class of error based on the slope categories assigned to the first slope and the second slope.
Claims27
A method for sensor error analysis for unstable errors, wherein a sensor outputs an analog sensor signal as a function of a measured variable, the method comprising:
- generating a gradient signal as a function of the sensor signal;
- assigning, by an evaluation unit, a flank category of a plurality of specified flank categories to a first flank of the sensor signal based on the gradient signal;
- assigning, by the evaluation unit, a flank category of the plurality of flank categories to a second flank of the sensor signal based on the gradient signal, wherein the second flank follows the first flank;
- and
- determining, by the evaluation unit, an error class as a function of the flank category assigned to the first flank and the flank category assigned to the second flank,
- wherein:
- the first flank is assigned to a first flank category of the plurality of flank categories only in response to the gradient signal exceeding a positive first gradient limiting value during the first flank;
- and
- the second flank is assigned to the first flank category only in response to the gradient signal exceeding the first gradient limiting value during the second flank.
A diagnostic device for sensor error analysis with respect to unstable errors, wherein the sensor outputs an analog sensor signal as a function of a measured variable, wherein the diagnostic device comprising:
- a differentiator configured to generate a gradient signal as a function of the sensor signal;
- and
- an evaluation unit configured to:
- assign a flank category of a plurality of specified flank categories to a first flank of the sensor signal based on the gradient signal;
- assign a flank category of the plurality of flank categories to a second flank, following the first flank, of the sensor signal based on the gradient signal;
- and
- determine an error class as a function of the flank category assigned to the first flank and the flank category assigned to the second flank, wherein:
- the first flank is assigned to a first flank category of the plurality of flank categories only in response to the gradient signal exceeding a positive first gradient limiting value during the first flank;
- and
- the second flank is assigned to the first flank category only in response to the gradient signal exceeding the first gradient limiting value during the second flank.
Dependencies are inferred from the claim text.