Detection of stuck in range sensor and method

• Main Authors: Ochs David S, Welchko Brian A
• Format: Patent
• Language: English
• Published: 28.03.2017
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; PHYSICS; TARIFF METERING APPARATUS; TESTING

A method for detecting a sensor that is stuck in range includes computing a variation value for each of a first signal and a second signal generated by a respective first and second sensor, wherein the first and second signals are correlated signals. The variation value for each of the first and second signals is computed for the same diagnostic period, such that when one of the first and second sensors is generating a signal which is stuck in range during the diagnostic period, the signal stuck in range will be characterized by a variation value which is much less than the variation value of the correlated signal. The magnitude of difference between the variation values of the first and second signals can be compared to a predetermined fault threshold to diagnose a sensor stuck in range.