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Anti-skid brake control system for automotive vehicle with feature of variable timing of derivation of wheel acceleration data

  • US 5,058,020 A
  • Filed: 03/28/1989
  • Issued: 10/15/1991
  • Est. Priority Date: 03/29/1988
  • Status: Expired due to Fees
First Claim
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1. An anti-skid brake control system for an automotive vehicle, comprising:

  • a braking circuit including a wheel cylinder for generating a braking force for declaring a vehicular wheel in response to a manual braking operation;

    a pressure control valve disposed within said braking circuit for controlling said braking force to be generated in said wheel cylinder depending upon the vehicular braking condition, said pressure control valve increasing said braking force in said wheel cylinder in a first mode and decreasing said braking force in said wheel cylinder in a second mode;

    a sensor means for monitoring rotation speed of said vehicular wheel to produce a wheel speed indicative signal;

    first means for deriving a wheel speed data on the basis of said wheel speed indicative signal;

    second means for periodically deriving a first wheel acceleration data having a first precision level and a first lag time based on said wheel speed data;

    third means for periodically deriving a second wheel acceleration data having a second precision level and a second lag time based on said wheel speed data, where said second precision level is lower than said first precision level and said second lag time is shorter than said first lag time; and

    fourth means responsive to said first wheel acceleration data indicative of wheel deceleration greater than a predetermined wheel deceleration threshold, for initiating skid control cycle in which operation mode of said pressure control valve is selectively controlled between said first mode and said second mode so as to maintain wheel slippage at a predetermined optimum value according to a predetermined schedule, said fourth means further detecting a peak value of said second wheel acceleration data and causing braking pressure to increase in said first mode in said pressure control valve.

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