Estimating road friction coefficient
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United States of America Patent
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-
Jun 23, 1992
Grant Date -
N/A
app pub date -
Feb 13, 1991
filing date -
Feb 16, 1990
priority date (Note) -
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status (Latency Note)
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Abstract
A road surface friction coefficient estimating method and apparatus in an anti-lock control device for preventing locking of vehicle wheels during braking. The road surface friction coefficient is estimated by comparing a deceleration of an estimated vehicle speed with a predetermined threshold value. The predetermined threshold value has different road surface friction coefficient values corresponding to different vehicle deceleration values. The braking hydraulic pressure is then repeatedly varied in accordance with signals indicative of the estimated road surface friction coefficient, signals indicative of the estimated vehicle speed, and one of the signals indicative of the slowest rear wheel speed and the front wheel speeds.
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