Anti-skid device for automotive vehicles

Abstract

Abstract AN ANTI-SKID DEVICE FOR AN AUTOMOTIVE VEHICLE IS DISCLOSED COMPRISING A WHEEL SPEED VOLTAGE GENERATOR FOR GENERATING A WHEEL SPEED VOLTAGE CORRESPONDING TO A WHEEL SPEED, A REFERENCE WHEEL SPEED VOLTAGE GENERATOR WHICH GENERATES A REFERENCE WHEEL SPEED VOLTAGE CORRESPONDING TO A REFERENCE WHEEL SPEED WHICH, BEING INITIALLY LOWER THAN A WHEEL SPEED, IS REDUCED AT A FIRST SET DECELERATING RATE WITH THE DECREASE IN WHEEL SPEED AT THE TIME OF BRAKING. A DIFFERENTIAL AMPLIFIER WHICH GENERATES A SIGNAL TO REDUCE THE BRAKING PRESSURE WHEN SAID REFERENCE WHEEL SPEED VOLTAGE IS HIGHER THAN SAID WHEEL SPEED VOLTAGE, SAID WHEEL SPEED VOLTAGE GENERATOR, REFERENCE WHEEL SPEED VOLTAGE GENERATOR AND DIFFERENTIAL AMPLIFIER CONSTITUTING A LOCK DETECTOR MEANS. A PRESSURE DIFFERENCE DETECTOR IS PROVIDED FOR GENERATING A SIGNAL WHEN THE BRAKING PRESSURE OF A WHEEL CYLINDER IS EQUAL TO THAT OF A MASTER CYLINDER, WHILE A CONTROL MEANS SWITCHES SAID REFERENCE WHEEL SPEED VOLTAGE GENERATOR FROM A FIRST SET DECELERATING RATE TO A LOWER SECOND SET DECELERATING RATE WHEN SAID PRESSURE DIFFERENCE DETECTOR GENERATES A SIGNAL AFTER THE GENERATION OF A BRAKING-PRESSURE REDUCING SIGNAL BY SAID DIFFERENTIAL AMPLIFIER, AND A BRAKING PRESSURE MODULATOR MEANS REDUCES THE BRAKING PRESSURE ACCORDING TO A SIGNAL FROM SAID DIFFERENTIAL AMPLIFIER. THE MAXIMUM VALUE OF THE FRICTION COEFFICIENT BETWEEN THE WHEELS AND A ROAD SURFACE IS SOUGHT WHILE THE MAXIMUM TIRE TORQUE CORESPONDING TO SAID MAXIMUM FRICTION COEFFICIENT IS OBTAINED, TO CONTROL THE BRAKING PRESSURE EFFICIENTLY AND SAFELY ON A ROAD SURFACE WITH ANY FRICTION COEFFICIENT FROM A FROZED ROAD TO A CONCRETE-PAVED ROAD WITHOUT THE LOCKING OF WHEELS, IRRESPECTIVE OF THE MANNER IN WHICH A VEHICLE DRIVER APPLIED THE BRAKING FORCE TO THE WHEELS.

Inventors

• 👤 Hiroshi Arai
• 👤 Akira Nakamura
• 👤 Atutoshi Okamoto
• 👤 Shunji Okumura

Bibliographic Details