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Brake control device in an antilock brake system

  • US 5,150,298 A
  • Filed: 05/10/1991
  • Issued: 09/22/1992
  • Est. Priority Date: 03/13/1989
  • Status: Expired due to Term
First Claim
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1. A brake control device for use in an antilock brake system for automatically adjusting a valve responsive to an indication of brake locking to reduce a fluid pressure in a brake cylinder to stop brake locking, said brake control device comprising:

  • means for outputting a pressure reduction signal K, in accordance with wheel deceleration;

    pressure detecting means for providing an indication of a current brake cylinder fluid pressure;

    means for outputting a compensation value α

    in accordance with vehicle deceleration, said vehicle deceleration being proportional to said fluid pressure;

    means for calculating a solenoid opening coefficient J in accordance with said compensation value α and

    said pressure reduction signal K; and

    means for determining a duty ratio in accordance with said solenoid opening coefficient J, said duty ratio being a time signal indicative of predetermined time periods during which said valve is to be opened and closed to adjust the brake cylinder fluid pressure, the time period during which said valve is opened being larger when said detected current brake cylinder fluid pressure is decreasing, thereby maintaining said predetermined amount of pressure reduction.

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