Method of wheel speed sensor rationalization with a longitudinal accelerometer
AssigneeFca US LLC
InventorsScott E Henson, Stephanie R Beck, Roger C Sager, Anthony N Gorney, Mohammed N Akhtar
Life of this patent
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Abstract
A method of rationalizing operation of a vehicle wheel speed sensor is provided. The method includes the steps of receiving an output signal from a longitudinal accelerometer, receiving an output signal from a wheel speed sensor, determining whether an acceleration event exists based on the output signal from the longitudinal accelerometer, evaluating the wheel speed sensor output signal during the acceleration event, and determining whether the wheel speed sensor signal exceeds a set threshold value during the acceleration event.
Claims18
A method of rationalizing a vehicle wheel speed sensor, the method comprising the steps of:
- receiving an output signal from a longitudinal accelerometer;
- receiving an output signal from a wheel speed sensor;
- determining whether an acceleration event exists based on the output signal from the longitudinal accelerometer, wherein an acceleration event exists when the output signal from the longitudinal accelerometer meets or exceeds one or more acceleration thresholds;
- evaluating the wheel speed sensor output signal during the acceleration event;
- determining whether the wheel speed sensor output signal exceeds a set threshold value during the acceleration event;
- and
- sending an indication of an error detectable in a vehicle including the wheel speed sensor when the wheel speed sensor output signal does not exceed the set threshold value.
A vehicle system, comprising:
- a longitudinal accelerometer adapted to sense an acceleration of a vehicle and to provide an output signal indicative of the magnitude of vehicle acceleration;
- a wheel speed sensor adapted to sense a wheel speed and to provide an output signal indicative of the magnitude of wheel speed;
- and
- a controller communicatively coupled with the longitudinal accelerometer and the wheel speed sensor and adapted to:
- receive an output signal from the longitudinal accelerometer;
- receive an output signal from the wheel speed sensor;
- determine whether an acceleration event exists that meets two acceleration thresholds based on the output signal from the longitudinal accelerometer;
- evaluate the wheel speed sensor output signal during the acceleration event;
- determine whether the wheel speed sensor signal is a non-zero value during the acceleration event;
- and
- sending an indication of an error detectable in a vehicle including the wheel speed sensor when the wheel speed sensor signal is not a non-zero value during the acceleration event.
Dependencies are inferred from the claim text.