Method and device for monitoring sensor functions
AssigneeRobert Bosch GmbH
InventorsFranz Eidler, Werner Zimmermann, Thomas Ruping
Life of this patent
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Abstract
A method and a device for monitoring the functions of a sensor, in particular of a sensor for detecting a measurable value in a motor vehicle. If specified operating states exist, a measurable value is detected and compared to a reference value. Faults are detected when a measured value, held by the sensor, deviates by more than a tolerance value from a reference value. A measured value which had been detected and stored at an earlier instant when a corresponding operating state existed is used as the reference value.
Claims10
A method for monitoring a sensor comprising the steps of:
- (a) detecting a measured value and storing the measured value as a reference value when one of a plurality of specified operating states exists at a first time;
- (b) detecting a measurable value when one of the plurality of specified operating states exists at a second time after the detecting and storing in step (a);
- (c) comparing the measurable value detected in step (b) with the reference value to determine a magnitude of a difference between the measurable value and the reference value;
- and
- (d) determining a fault when the magnitude of the difference determined in step (c) is greater than a tolerance value, wherein the one of the plurality of operating states includes when a control mechanism is positioned at an end limit stop of the control mechanism.
A device for monitoring at least one function of a sensor comprising:
- a) a reference value storage device for detecting and storing a measured value as a reference value when one of a plurality of specified operating states exists at a first time;
- b) a detector for detecting a measurable value when one of the plurality of specified operating states exists at a second time;
- c) a comparator, operatively coupled with the detector and with the reference value storage device, for comparing the measured value detected by the detector with the reference value;
- and
- d) a fault detector, operatively coupled with the comparator, for detecting a fault when the measurable value and the reference value differ by more than a tolerance value wherein the one of the plurality of specified operating states includes when a control mechanism is positioned at an end limit stop of the control mechanism.
Dependencies are inferred from the claim text.