Anti-skid system for vehicles

Abstract

Abstract AN ANTI-SKID SYSTEM FOR VEHICLES IS DISCLOSED HAVING A NOVEL WHEEL LOCK DETECTING APPARATUS FOR SUPPLYING BRAKE RELEASE SIGNALS. THE EXEMPLARY SYSTEM INCLUDES AN ACTUAL WHEEL SPEED VOLTAGE GENERATOR FOR GENERATING AN ACTUAL WHEEL SPEED VOLTAGE CORRESPONDING TO AN ACTUAL WHEEL SPEED AS WELL AS A REFERENCE WHEEL SPEED VOLTAGE GENERATOR FOR GENERATING A REFERENCE WHEEL SPEED VOLTAGE CORRESPONDING TO A REFERENCE WHEEL SPEED. THE REFERENCE WHEEL SPEED VOLTAGE EXISTS ACROSS A CAPACITOR AND DECREASES WITH A FIRST DISCHARGING TIME CONSTANT VALUE CORRESPONDING TO A FIRST PRESET DECELERATION VALUE. THE REFERENCE VOLTAGE STARTS DISCHARGING FROM AN INITIAL VALUE WHICH IS LOWER THAN THE ACTUAL WHEEL SPEED VOLTAGE WHEN THE RATE OF REDUCTION OF ACTUAL WHEEL SPEED VOLTAGE REACHES A VALUE CORRESPONDING TO SAID FIRST PRESET DECELERATION VALUE. A DIFFERENTIAL AMPLIFIER IS INCLUDED FOR PRODUCING AN OUTPUT SIGNAL TO REDUCE BRAKING PRESSURE WHEN SAID REFERENCE WHEEL SPEED VOLTAGE BECOMES HIGHER THAN AN ACTUAL WHEEL SPEED VOLTAGE. THERE IS ALSO A DETECTOR FOR DETECTING A PREDETERMINED VARIATION IN THE ACTUAL WHEEL SPEED VOLTAGE DURING A TIME STARTING FROM THE TERMINATION OF THE OUTPUT SIGNAL FROM SAID DIFFERENTIAL AMPLIFIER OR, IN OTHER WORDS, AFTER THE BRAKE RELEASE SIGNAL TERMINATES. A TIME CONSTANT SETTING DEVICE IS PROVIDED FOR SWITCHING THE DISCHARGING TIME CONSTANT CORRESPONDING TO SAID FIRST PRESET DECELERATION VALUE TO A SECOND DISCHARGING TIME CONSTANT VALUE CORRESPONDING TO A SECOND PRESET DECELERATION VALUE, WHICH IS SMALLER THAN THE FIRST. THE SWITCHING BETWEEN FIRST AND SECOND DISCHARGE TIME CONSTANTS IS CONTROLLED BY AN OUTPUT SIGNAL OF SAID DETECTOR TO THEREBY CONTROL THE REFERENCE WHEEL SPEED VOLTAGE GENERATOR, WHEREBY THE WHEEL LOCK DETECTING APPARATUS ACCURATELY DETECTS ANY TENDENCY OF THE WHEELS TO LOCK AND PRODUCES A BRAKING PRESSURE REDUCING SIGNAL TO ACTUATE A BRAKING PRESSURE MODULATOR THEREBY REDUCING BRAKING PRESSURE.

Inventors

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

Bibliographic Details