초록 ▼

Road surface frictional force is sensed by measuring the strain of a tire or the strain in the vicinity of a wheel of a vehicle, and the sensing of the road surface frictional force is part of an antilock braking system in which, cyclically, brake fluid pressure is increased when the road surface fr

Road surface frictional force is sensed by measuring the strain of a tire or the strain in the vicinity of a wheel of a vehicle, and the sensing of the road surface frictional force is part of an antilock braking system in which, cyclically, brake fluid pressure is increased when the road surface frictional force increases in response to increase of the brake fluid pressure and decreased when the road surface frictional force decreases despite increase of the brake fluid pressure and brake fluid pressure is increased again when the road surface frictional force decreases in response to decreasing of the brake fluid pressure. Alternatively, road surface friction coefficient is detected by sensing the strain of a tire or the strain in the vicinity of a wheel thereby to produce signals indicative of road surface frictional force and vertical load and from the signals calculating the road surface friction coefficient, and the detecting of the road surface friction coefficient is part of an antilock braking system in which, cyclically, brake fluid pressure is increased when the road surface friction coefficient increases in response to increases of the brake fluid pressure, the brake fluid pressure is decreased when rate of increase of the road surface friction coefficient has dropped below a preset value, thereby to decrease the road surface friction coefficient, and the brake fluid pressure is increased again when the road surface friction coefficient has decreased to below a preset value.

대표청구항 ▼

[ What is claimed is:] [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 pressur

[ What is claimed is:] [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.