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Anti-skid control apparatus for a vehicle braking system

  • US 4,872,729 A
  • Filed: 09/17/1987
  • Issued: 10/10/1989
  • Est. Priority Date: 09/19/1986
  • Status: Expired due to Fees
First Claim
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1. In an anti-skid control apparatus for a vehicle braking system including:

  • (A) a pair of front wheels, and a pair of rear wheels in which wheel cylinders are diagonally connected in conduits;

    (B) a first fluid pressure control valve device for controlling the brake fluid pressure of the wheel cylinder of one of said front wheels, arranged between a first fluid pressure generating chamber of a tandem master cylinder and said wheel cylinder of the one front wheel;

    (C) a second fluid pressure control valve device for controlling the brake fluid pressure of the wheel cylinder of another of said front wheels, arranged between a second fluid pressure generating chamber of said tandem master cylinder and said wheel cylinder of the other front wheel;

    (D) a control unit for judging the said conditions of said front and rear wheels and for generating control signals for controling said first and second fluid pressure control valve devices; and

    (E) a valve apparatus for generating a fluid pressure in accordance with the lower of the brake fluid pressures of said front wheels controlled with said first and second fluid pressure control valve devices, being arranged between said wheel cylinders of the front wheels and thoe of the rear wheels;

    the improvements in which, when a brake-relieving output signal for decreasing the brake fluid pressure is obtained from only one of said rear wheels, it is neglected, and when the brake-relieving output signals are obtained from both of said rear wheels, the brake-relieving output signal of the one of said rear wheels which is obtained later than that of the other is logically combined with the brake-relieving output signal of the one of said front wheels running on the same side as said one of the rear wheels, to form a brake-relieving control signal for controlling said first or second fluid pressure control valve device connected to the wheel cylinder of said one front wheel, and a brake-increasing control signal for increasing the brake fluid pressure by said first or second fluid pressure control valve device after said brake-relieving control signal disappears, is formed on the basis of the brake-increasing output signal of the one of said one front and rear wheels on said same side which has a stronger locking tendency than the other.

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