Abstract A skid control device for vehicles, comprising a wheel velocity voltage generator adapted to generate a voltage corresponding to wheel velocity, a control circuit adapted to produce a braking pressure reducing signal by determining the occurrence of wheel lock from the wheel velocity voltage, an electromagnetic threeway change-over valve responsive to the braking pressure reducing signal to modulate the braking pressure, a braking pressure modulator which changes the braking pressure of the wheel cylinder by means of the operating signal from said change-over valve, a braking switch adapted to produce an electric signal in conformity with the effort applied to the brake pedal, and an AND circuit adapted to produce a skid control signal in accordance with the ''''and'''' of the signal derived from the controller and the signal derived from the braking switch, thus preventing the wheel from becoming locked during braking.
A vehicle speed control device wherein a reference wheel velocity is so set as to decrease at a predetermined rate and the wheel braking pressure is decreased when the instantaneous value of the actual wheel velocity in deceleration becomes lower than the instantaneous value of said reference wheel velocity decreasing at a predetermined rate thereby preventing wheel lock, the improvement comprising comparator means for comparing a signal corresponding to said actual wheel velocity with a signal corresponding to said instantaneous reference wheel velocity decreasing at a predetermined rate, said comparator means producing an output signal when the actual wheel velocity is lower than said instantaneous reference wheel velocity; a braking switch interlocked with the brake pedal for providing a signal only during braking; and an AND circuit having its inputs coupled to the output of said comparator means and to said braking switch, said AND circuit energizing the braking circuit to control skidding only when the brake is applied by depressing the brake pedal.
Claim 2
Dependent Claim
164 words
A vehicle speed control device wherein a reference wheel velocity is so set as to decrease at a predetermined rate and the wheel braking pressure is decreased when the instantaneous value of the actual wheel velocity in deceleration becomes lower than the instantaneous value of said reference wheel velocity decreasing at a predetermined rate thereby preventing wheel lock, the improvement comprising comparator means for comparing a signal corresponding to said actual wheel velocity with a signal corresponding to said instantaneous reference wheel velocity decreasing at a predetermined rate, said comparator means producing an output signal when the actual wheel velocity is lower than said instantaneous reference wheel velocity; a braking switch interlocked with the brake pedal for providing a signal only during braking; and an AND circuit having its inputs coupled to the output of said comparator means and to said braking switch, said AND circuit energizing the braking circuit to control skidding only when the brake is applied by depressing the brake pedal.
Claim 3
Dependent Claim
16 words
The skid control device defined by claim 1 wherein said comparator means comprises a differential amplifier.