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Anti-skid brake control system for automotive vehicle with a feature variable wheel slippage threshold variable depending upon vehicular lateral force

  • US 4,758,053 A
  • Filed: 04/09/1986
  • Issued: 07/19/1988
  • Est. Priority Date: 04/09/1985
  • Status: Expired due to Term
First Claim
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1. An anti-skid brake control system for an automotive vehicle comprising:

  • a hydraulic brake circuit for building up braking fluid pressure according to manual braking operation and distributing fluid pressure to at least one wheel cylinder;

    a pressure control valve unit disposed within said hydraulic brake circuit for varying valve positions between a first position in which fluid pressure in the wheel cylinder is increased according to the increase in said braking pressure built up in said hydraulic brake circuit, and a second position in which said fluid pressure in said wheel cylinder is decreased;

    a first sensor for producing a wheel speed indicative signal representative of a rotation speed of a vehicular wheel;

    a second sensor for producing a lateral force indicative signal representative of a lateral force applied to a vehicle body;

    a controller receiving said wheel speed indicative signal for deriving a control signal for operating said pressure control valve unit between said first and second positions, said controller deriving a wheel slippage based on said wheel speed and comparing derived wheel slippage with a given reference value so as to operate said pressure valve to said second position when the derived wheel slippage is greater than said given reference value, said controller being further operable for deriving said given reference value on the basis of the magnitude of the lateral force exerted on the vehicle body for adjusting said given reference value depending upon the lateral force magnitude, said controller comparing said lateral force indicative signal value with a given threshold representative of a lateral force criterion and responsive to said lateral force indicative signal having a value greater than said given threshold for decreasing said given reference value.

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