Method and system for determining and compensating for a faulty

Details Method and system for determining and compensating for a faulty Method and system for determining and compensating for a faulty

1995-02-03

1997-06-24

Park, Collin W.

Boots, shoes, and leggings

364424039, 364424045, 73510, 324161, G06F 1700

Patent

active

056422806

ABSTRACT:
Method and system are provided for "filtering out" a faulty wheel speed input signal in a vehicle control system, such as an ABS and/or TC system in order to ensure that the faulty wheel speed input signal does not contaminate or corrupt wheel speed information contained in the other wheel speed input signals. If such faulty wheel speed input signal indicates an abnormally high speed, it will increase the other wheel speed information if undetected. The wheel speed information is essential in detecting wheel instability or slip. It is important that wheel speed is not over-estimated since this may result in false slip detection and false ABS activation. Over-estimation of the vehicle speed would occur if the information from a spinning wheel is not properly filtered or compensated for. In one embodiment of the present invention, a bad sensor is detected by detecting and compensating for a single outlying ramp (outlier) of wheel speed. In a second embodiment of the present invention, an erratic sensor is detected and compensated for in the control system.

REFERENCES:
patent: 4720794 (1988-01-01), Skarvada
patent: 4811232 (1989-03-01), Hoashi et al.
patent: 5193886 (1993-03-01), Gloceri
patent: 5404304 (1995-04-01), Wise et al.
patent: 5406485 (1995-04-01), Wise et al.
patent: 5436836 (1995-07-01), Holtz et al.
patent: 5485379 (1996-01-01), Kremer

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