Method and device for checking a sensor signal
AssigneeContinental Automotive GmbH
InventorsZheng-Yu Jiang, Matthias Kretschmann, Herbert Preis, Christoph Resch
Life of this patent
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Abstract
Depending on a sensor signal, a noise signal which suppresses a useful signal spectrum of the sensor signal is determined by filtering using a filter. A noise variable, which is a measure of a noise of the sensor signal, is determined depending on the noise signal. An error of the sensor signal is identified depending on the noise variable determined.
Claims19
A method of checking a sensor signal of a sensor, comprising the steps of:
- in dependence upon the sensor signal, determining a noise signal by means of filtering with a filter that suppresses a useful signal spectrum of the sensor signal,
- in dependence upon the noise signal, determining a noise quantity, which is a measure of a noise of the sensor signal, and
- detecting an error of the sensor signal in dependence upon the determined noise quantity,
- wherein the noise quantity is determined as a standard deviation of the noise signal, and
- wherein the standard deviation for an actual time step is determined recursively in dependence upon a first value, which was determined as the standard deviation for a preceding time step, and a second value, which represents the noise signal at the actual time step.
A device for checking a sensor signal of a sensor, which device is operable to
- determine a noise signal in dependence upon the sensor signal by means of filtering with a filter that suppresses a useful signal spectrum of the sensor signal,
- determine a noise quantity, which is a measure of a noise of the sensor signal, in dependence upon the noise signal, and
- detect an error of the sensor signal in dependence upon the determined noise quantity,
- wherein the noise quantity is determined as a standard deviation of the noise signal, and
- wherein the standard deviation for an actual time step is determined recursively in dependence upon a first value, which was determined as the standard deviation for a preceding time step, and a second value, which represents the noise signal at the actual time step.
A method of checking a sensor signal of a sensor, comprising the steps of:
- determining a noise signal based on the sensor signal by suppressing a useful signal spectrum of the sensor signal,
- determining a noise quantity based on the noise signal, which noise quantity is a measure of a noise of the sensor signal,
- wherein the noise quantity is determined as a standard deviation of the noise signal,
- wherein the standard deviation for an actual time step is determined recursively in dependence upon a first value, which was determined as the standard deviation for a preceding time step, and a second value, which represents the noise signal at the actual time step, and
- identifying a malfunction of the sensor based on the determined noise quantity.
A method of checking a sensor signal of a sensor, comprising the steps of:
- in dependence upon the sensor signal, determining a noise signal by means of filtering with a filter that suppresses a useful signal spectrum of the sensor signal,
- in dependence upon the noise signal, determining a noise quantity, which is a measure of a noise of the sensor signal, and
- detecting an error of the sensor signal in dependence upon the noise quantity,
- wherein upon detection of an error an error counter is incremented.
Dependencies are inferred from the claim text.