Wheel speed and acceleration detection immune to disturbance

Details Wheel speed and acceleration detection immune to disturbance Wheel speed and acceleration detection immune to disturbance

1984-07-20

1987-06-02

Chin, Gary

Boots, shoes, and leggings

364566, 364575, 364426, 324161, 324166, G01P 1100, G01P 1500

Patent

active

046708529

ABSTRACT:
A pulse signal is generated by a wheel speed sensor with a frequency proportional to the speed of rotation of a vehicle wheel, the pulse signal comprising a plurality of frames each having a series of a predetermined number of pulses which are tended to be affected by noise and pulse mutilation. Pulses in each frame are counted and from the count is derived an instantaneous wheel speed value. The difference between the successively derived instantaneous speed values is taken and compared with a predetermined threshold. A first or a second indication is given in response to the difference being lower or higher than the threshold, respectively. If the first indication is given, output signals representing the average wheel speed and average wheel acceleration of the wheel are derived from the instantaneous speed values of successive frames. If the second indication is given, the instantaneous speed value of the previous frame is used instead of the instantaneous value of the subsequent frame which is disturbed by noise or pulse mutilation to derive the output signals.

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patent: 4497026 (1985-01-01), Braschel et al.
patent: 4506216 (1985-03-01), Fukamachi et al.
patent: 4517647 (1985-05-01), Harada et al.

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