Anti-skid device for vehicles

Claim 2

An anti-skid device for vehicles comprising a wheel speed voltage generator for generating a wheel speed voltage corresponding to the wheel speed, a reference wheel speed voltage generator for generating a reference wheel speed voltage when said wheel speed voltage reaches a predetermined deceleration, said reference wheel speed voltage decreasing at a rate corresponding to said predetermined deceleration with its initial value being a preset voltage lower than the voltage valve reached when said wheel speed voltage reaches said predetermined deceleration, a releasing signal generator for generating a braking force releasing signal when said reference wheel speed voltage is higher than said wheel speed voltage, a wheel speed detector for generating a signal upon detecting that the wheel speed is lower than a predetermined value, an AND circuit for generating a signal when both of said wheel speed detector and said releasing signal generator generate respective signals, means for changing the rate of decrease of said reference wheel speed voltage to a smaller value for a predetermined time after a signal is generated by said AND circuit, and means for reducing the braking force by the output signal from said releasing signal generator.

Claim 3

An anti-skid device for vehicles comprising a locking detector for detecting the performance of excessive braking on the wheels to produce a first releasing signal, a memory circuit for storing said first releasing signal for a predetermined time to produce an output signal during said predetermined time, a wheel speed detector for producing an output signal upon detecting that the wheel speed is below a predetermined speed, an AND circuit for producing an output signal when both of said wheel speed detector and said memory circuit produce respective output signals, a timer circuit for limiting the output signal from said AND circuit within a predetermined time to produce a second releasing signal for reducing the braking force, a circuit for causing said memory circuit to store said second releasing signal, and braking force modulator means for receiving said first and second releasing signals to reduce the braking force.

Claim 4

An anti-skid device for vehicles comprising a locking detector for detecting the performance of excessive braking on the wheels to produce a first releasing signal, a memory circuit for storing said first releasing signal for a predetermined time to produce an output signal during said predetermined time, a wheel speed detector for producing an output signal upon detecting that the wheel speed is below a predetermined speed, an AND circuit for producing an output signal when both of said wheel speed detector and said memory circuit produce respective output signals, a timer circuit for limiting the output signal from said AND circuit within a predetermined time to produce a second releasing signal for reducing the braking force, a circuit for causing said memory circuit to store said second releasing signal, and braking force modulator means for receiving said first and second releasing signals to reduce the braking force.

Claim 5

An anti-skid device for vehicles comprising a first braking force control unit provided for non-driven wheels, said first braking force control unit comprising a first locking detector for detecting the performance of excessive braking on said non-driven wheels to produce a first releasing signal for reducing the braking force, and first braking force modulator means for receiving said first releasing signal to reduce the braking force, and a second braking force control unit provided for driven wheels, said second braking force control unit comprising a second locking detector for detecting the performance of excessive braking on said driven wheels to produce a second releasing signal, a memory circuit for storing said second releasing signal for a predetermined time to produce an output signal during said predetermined time, a wheel speed detector for producing an output signal upon detecting that the wheel speed is below a predetermined speed, an AND circuit for producing an output signal when both of said wheel speed detector and said memory circuit produce respective output signals, a timer circuit for limiting the output signal from said AND circuit within a predetermined time to produce a third releasing signal for reducing the braking force, a circuit for causing said memory circuit to store said third releasing signal therein, and second braking force modulator means for receiving said second releasing signal and said third releasing signal to reduce the braking force.

Claim 6

An anti-skid device for vehicles comprising a first braking force control unit provided for non-driven wheels, said first braking force control unit comprising a first locking detector for detecting the performance of excessive braking on said non-driven wheels to produce a first releasing signal for reducing the braking force, and first braking force modulator means for receiving said first releasing signal to reduce the braking force, and a second braking force control unit provided for driven wheels, said second braking force control unit comprising a second locking detector for detecting the performance of excessive braking on said driven wheels to produce a second releasing signal, a memory circuit for storing said second releasing signal for a predetermined time to produce an output signal during said predetermined time, a wheel speed detector for producing an output signal upon detecting that the wheel speed is below a predetermined speed, an AND circuit for producing an output signal when both of said wheel speed detector and said memory circuit produce respective output signals, a timer circuit for limiting the output signal from said AND circuit within a predetermined time to produce a third releasing signal for reducing the braking force, a circuit for causing said memory circuit to store said third releasing signal therein, and second braking force modulator means for receiving said second releasing signal and said third releasing signal to reduce the braking force.

Claim 7

An anti-skid device for vehicles according to ClaIm 3, wherein each of said first locking detector and said second locking detector comprises a wheel speed voltage generator, a reference wheel speed voltage generator for generating a reference wheel speed voltage when the rate of decrease of said wheel speed voltage reaches a predetermined deceleration, said reference wheel speed voltage decreasing as a function of said predetermined deceleration with its initial value being a preset voltage lower than the voltage valve reached when said wheel speed voltage reaches said predetermined deceleration, and a signal generator for generating a first or a second releasing signal when said reference wheel speed voltage is higher than said wheel speed voltage.

Claim 8

An anti-skid device for vehicles comprising a first braking force control unit provided for non-driven wheels, said first braking force control unit comprising a first locking detector for detecting the performance of excessive braking on said non-driven wheels to produce a first releasing signal for reducing the braking force and first braking force modulator means for receiving said first releasing signal to reduce the braking force, and a second braking force control unit provided for driven wheels, said second braking force control unit comprising a second locking detector for detecting the performance of excessive braking on said driven wheels to produce a second releasing signal and second braking force modulator means for receiving said second releasing signal to reduce the braking force, each of said first and second locking detectors are composed of a wheel speed voltage generator for generating a wheel speed voltage corresponding to the wheel speed of a vehicles wheel, a reference wheel speed voltage generator for generating a reference wheel speed voltage when the rate of decrease of said wheel speed voltage reaches a predetermined deceleration, said reference wheel speed voltage decreasing as a function of said predetermined deceleration with its initial value being a preset voltage lower than the voltage value reached when said wheel speed voltage reaches said predetermined deceleration, and a signal generator for generating a first or a second releasing signal when said reference wheel speed voltage becomes higher than said wheel speed voltage, said second braking force control unit further comprising a wheel speed detector for producing a signal upon detecting that the wheel speed of a vehicle wheel is below a predetermined value, an AND circuit for producing a signal when both the signal from said wheel speed detector and said second release signal are produced, means for changing the rate of decrease of said reference wheel speed voltage in said second locking detector to a smaller value only for a predetermined time after the generation of the signal from said AND circuit and means for releasing the braking force via the output from said releasing signal generator.

Claim 9

An anti-skid device for vehicles comprising a first braking force control unit provided for non-driven wheels, said first braking force control unit comprising a first locking detector for detecting the performance of excessive braking on said non-driven wheels to produce a first releasing signal for reducing the braking force and first braking force modulator means for receiving said first releasing signal to reduce the braking force, and a second braking force control unit provided for driven wheels, said second braking force control unit comprising a second locking detector for detecting the performance of excessive braking on said driven wheels to produce a second releasing signal and second braking force modulator means for receiving said second releasing signal to reduce the braking force, each of said first and second locking detectors are composed of a wheel speed voltage generator for generating a wheel speed voltage corresponding to the wheel speed of a vehicles wheel, a reference wheel speed voltage generator for generating a reference wheel speed voltage when the rate of decrease of said wheel speed voltage reaches a predetermined deceleration, said reference wheel speed voltage decreasing as a function of said predetermined deceleration with its initial value being a preset voltage lower than the voltage value reached when said wheel speed voltage reaches said predetermined deceleration, and a signal generator for generating a first or a second releasing signal when said reference wheel speed voltage becomes higher than said wheel speed voltage, said second braking force control unit further comprising a wheel speed detector for producing a signal upon detecting that the wheel speed of a vehicle wheel is below a predetermined value, an AND circuit for producing a signal when both the signal from said wheel speed detector and said second release signal are produced, means for changing the rate of decrease of said reference wheel speed voltage in said second locking detector to a smaller value only for a predetermined time after the generation of the signal from said AND circuit and means for releasing the braking force via the output from said releasing signal generator.