Wheel speed calculation method

Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Indication or control of braking – acceleration – or deceleration

Reexamination Certificate

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Details

C701S074000, C701S079000, C303S168000, C324S160000

Reexamination Certificate

active

07069133

ABSTRACT:
A wheel speed calculation method wherein, when both rising and falling edges occur, the wheel speed is calculated using both the edges, when either of the edges does not occur, the wheel speed is calculated using both the edges in such a manner that for the edge not occurring, the preceding calculation value or the calculation value provided by assuming that one occurred within the temporary time, whichever is the lower, is selected. Further, neither of the rising and falling edges occurs, the minimum value of the two calculation values provided by assuming that only one edge occurred within the temporary time and the calculation value provided by assuming that only one rising edge and only one falling edge occurred within the temporary time or the calculation value of the preceding wheel speed, whichever is the lower, is selected as the wheel speed.

REFERENCES:
patent: 4799178 (1989-01-01), Spadafora et al.
patent: 4832415 (1989-05-01), Shinomiya
patent: 4992730 (1991-02-01), Hagiya
patent: 5012417 (1991-04-01), Watanabe et al.
patent: 5621711 (1997-04-01), Sohmuta
patent: 6166534 (2000-12-01), Suzumura
patent: 0 403 055 (1990-12-01), None
patent: 2-44258 (1990-02-01), None
European Search Report dated May 4, 2004.

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