Method for continuous sensor self-test
First Claim
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1. A method for determining a sensed parameter using a sensor, the sensor generating a signal, the sensor including complementary self-test stimulation inputs, the method comprising:
- a. stimulating the sensor using the complementary self-test stimulation inputs;
b. filtering the sensor signal;
c. determining the sensed parameter based on the filtered sensor signal;
d. comparing the sensor signal to an expected signal and generating a sensor self-test signal based at least in part on the comparison; and
e. periodically repeating steps a through d.
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Abstract
A method and device for self-test of a sensor. The method includes stimulating the sensor with signals that generate sensor outputs at a frequency that differs from the frequency of expected sensed parameter signals. The sensor output is filtered to remove the effects of the stimulation inputs, generating a sensed parameter signal. The unfiltered sensor output is compared to the expected output of the sensor with the stimulus input. A malfunctioning sensor may be detected by the comparison and appropriate action may then be taken.
36 Citations
13 Claims
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1. A method for determining a sensed parameter using a sensor, the sensor generating a signal, the sensor including complementary self-test stimulation inputs, the method comprising:
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a. stimulating the sensor using the complementary self-test stimulation inputs; b. filtering the sensor signal; c. determining the sensed parameter based on the filtered sensor signal; d. comparing the sensor signal to an expected signal and generating a sensor self-test signal based at least in part on the comparison; and e. periodically repeating steps a through d. - View Dependent Claims (2, 3, 4, 5)
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6. A sensor assembly for determining a sensed parameter while testing a sensor, the sensor assembly comprising:
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a. the sensor, the sensor including an output for generating an output signal, the sensor including complementary self-test stimulation inputs; b. a stimulator connected to the sensor for injecting a stimulation signal; c. a filter connected to the sensor output, such that the filter substantially removes the portion of the output signal due to the stimulation signal; and d. a comparator connected to the sensor output, the comparator generating a sensor self-test signal. - View Dependent Claims (7, 8, 9)
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10. A computer program product for use on a computer system for determining a sensed parameter value while performing sensor self-test, the system including a sensor, the sensor including complementary self-test stimulation inputs, the computer program product comprising a computer usable medium having computer readable program code thereon, the computer readable program code including program code for:
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a. stimulating the sensor using the complementary self-test stimulation inputs; b. filtering a sensor output signal; c. determining the sensed parameter value based on the filtered sensor signal; and d. comparing the sensor signal to an expected signal and generating a sensor self-test signal based at least in part on the comparison. - View Dependent Claims (11, 12, 13)
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Specification