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Anti-lock braking systems (ABS) for road vehicles to avoid premature engagement of the anti-lock braking system

  • US 5,707,121 A
  • Filed: 11/24/1995
  • Issued: 01/13/1998
  • Est. Priority Date: 03/25/1994
  • Status: Expired due to Fees
First Claim
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1. An anti-skid braking system for multi-axled wheeled vehicles having fluid actuated brakes associated with the vehicle wheels, comprising speed sensors associated with the vehicle wheels a scanning control device responsive to speed signals from the speed sensors to actuate a pressure dump device to periodically release the fluid pressure applied to the brake of any wheel which is determined, by detection of a predetermined normal level of relative slip between that wheel and the road surface, to be about to lock, and to later re-apply the actuating pressure to that brake when the tendency of that wheel to lock has reduced, and control means which includes:

  • (a) means for detecting when an anti-skid operation is in progress and for providing an inhibiting signal when an anti-skid operation is in progress;

    (b) means which, in the absence of said inhibiting signal, adjusts the magnitude of said predetermined level of relative slip to which said control device responds such as to reduce a slip detection sensitivity to a low level below said normal level of relative slip, at the first detection of an impending skid condition;

    (c) storage means for storing a signal representative of a predetermined time needed by an axle of the vehicle to move rapidly through its available deflection;

    (d) means which maintain the slip detection sensitivity at the low level for a period corresponding to said predetermined time needed by the axle to move rapidly through its available deflection; and

    (e) means to then restore the slip detection sensitivity to the level corresponding to said normal level of relative slip.

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