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Vehicle antilock braking device

  • US 5,938,713 A
  • Filed: 03/17/1997
  • Issued: 08/17/1999
  • Est. Priority Date: 10/13/1988
  • Status: Expired due to Fees
First Claim
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1. A vehicle antilock braking device comprising brake control means adapted to detect a road surface friction coefficient and to cyclically increase pressure of brake fluid while said road surface friction coefficient increases in response to elevation of brake fluid pressure, either relieve or release the brake fluid pressure when the rate of increase of road surface friction coefficient has dropped below a preset value and increase the brake fluid pressure again when the road surface friction coefficient has declined below a preset value, the road surface coefficient being the relative value of road surface frictional forces to the vertical load acting on one of a tire and wheel of a vehicle, the brake control means comprising a road surface friction coefficient detector, the road surface friction coefficient detector comprising a road surface friction sensor mounted on the vehicle to sense road surface frictional forces acting on said tire or wheel and a vertical load sensor mounted to measure vertical load on said tire and wheel of said vehicle, each of the sensors being equipped with means for measuring one of strain of the tire and strain around the wheel of said vehicle, and means for calculating the road surface friction coefficient from signals output from said road surface friction sensor and said vertical load sensor.

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