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Anti-skid control system for a road surface having a split coefficient of friction

  • US 5,058,018 A
  • Filed: 03/26/1990
  • Issued: 10/15/1991
  • Est. Priority Date: 03/27/1989
  • Status: Expired due to Term
First Claim
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1. An anti-skid control system for controlling a braking force applied to road wheels of an automotive vehicle, comprising:

  • wheel brake cylinders operatively connected to right and left road wheels, respectively, of said vehicle for applying braking force thereto;

    a hydraulic pressure generator for supplying a hydraulic braking pressure to each of said wheel brake cylinders;

    actuating means disposed in each hydraulic circuit communicating said hydraulic pressure generator with each of said wheel brake cylinders for individually controlling said hydraulic braking pressure supplied to each of said wheel brake cylinders;

    wheel speed detecting means for detecting a rotational wheel speed of each of said road wheels and providing an output signal corresponding to said wheel speed; and

    braking force control means for controlling said actuating means in response to said output signal of said wheel speed detecting means, said braking force control means including first detecting means and second detecting means for detecting each braking condition of said road wheels respectively on the basis of said output signal of said wheel speed detecting means,first driving means for producing driving signals fed to said actuating means on the basis of an output signal fed from one of said first and second detecting means for detecting a braking condition of one of said road wheels having a tendency to be locked firstly, said first driving means including split determination means for determining if said vehicle is running on a split road surface having a different coefficient of friction where one of said road wheels is on a road surface of the higher coefficient of friction and the other of said road wheels is on a road surface of the lower coefficient of friction; and

    second driving means for receiving said driving signals from said first driving means and modifying the driving signal fed to one of said actuating means provided for one of said road wheels on said road surface of the higher coefficient of friction in response to a value representing a vehicle speed immediately after said split determination means determines that said vehicle is running on said split road surface.

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