Abstract An antiskid device comprising a skid detector composed of a peripheral wheel deceleration detecting circuit and a peripheral wheel subdeceleration detecting circuit for differentiating the output signal from said peripheral wheel deceleration detecting circuit to detect a first derivative of the peripheral wheel deceleration (referred to as the subdeceleration hereunder) which can be regarded to be inversely proportional to the adhesion coefficient of the road surface, and a braking force controlling mechanism to control the braking force to be applied to the wheel, whereby said braking force controlling mechanism is actuated when the peripheral wheel deceleration from said peripheral deceleration detecting circuits exceeds a reference value corresponding to the adhesion coefficient of road, while said reference value is varied in inverse proportion to the output from said peripheral wheel subdeceleration detecting circuit to continuously vary the operation starting point of said braking force controlling mechanism in accordance with the adhesion coefficient of road such that said braking force controlling mechanism is operated to continuously produce the braking force well suited to the adhesion coefficients of roads ranging from a dry asphalt road surface and the like where the adhesion coefficient is large to a snowy frozen road surface and the like where the adhesion coefficient is small, thereby effecting the antiskidding operation safely and efficiently.
An antiskid device comprising: a skid detector comprising a peripheral wheel deceleration detecting circuit means for providing an output signal proportional to wheel deceleration and a peripheral wheel subdeceleration detecting circuit means for differentiating the output signal from said peripheral wheel deceleration detecting circuit means to thereby detect the peripheral wheel subdeceleration as an output therefrom, and a braking force controlling means for controlling the braking force applied to the wheel, wherein said braking force controlling means is actuated to controllably release the braking force applied to the wheel when the output from said peripheral wheel deceleration detecting circuit exceeds a reference value which is varied in inverse proportion to the output from said peripheral wheel subdeceleration detecting circuit means.
Claim 2
Dependent Claim
120 words
An antiskid device comprising: a skid detector comprising a peripheral wheel deceleration detecting circuit means for providing an output signal proportional to wheel deceleration and a peripheral wheel subdeceleration detecting circuit means for differentiating the output signal from said peripheral wheel deceleration detecting circuit means to thereby detect the peripheral wheel subdeceleration as an output therefrom, and a braking force controlling means for controlling the braking force applied to the wheel, wherein said braking force controlling means is actuated to controllably release the braking force applied to the wheel when the output from said peripheral wheel deceleration detecting circuit exceeds a reference value which is varied in inverse proportion to the output from said peripheral wheel subdeceleration detecting circuit means.
Claim 3
Dependent Claim
133 words
A skid detector for use in a vehicle antiskid device which device includes brake force control means, said skid detector comprising: a wheel deceleration detecting means for producing a deceleration signal corresponding to the first order time derivative of vehicle wheel speed, a wheel subdeceleration detecting means for producing a subdeceleration signal corresponding to the second order time derivative of vehicle wheel speed and hence approximately inversely proportional to the instantaneous coefficient of friction existing between a road surface and the vehicle wheels comparing means connected to both of said detecting means and adapted for connection to said brake force control means for automatically controlling a release of applied vehicle braking force when the magnitude of said deceleration signal exceeds a reference value that is varied in inverse proportion to said subdeceleration signal.
Claim 4
Dependent Claim
133 words
A skid detector for use in a vehicle antiskid device which device includes brake force control means, said skid detector comprising: a wheel deceleration detecting means for producing a deceleration signal corresponding to the first order time derivative of vehicle wheel speed, a wheel subdeceleration detecting means for producing a subdeceleration signal corresponding to the second order time derivative of vehicle wheel speed and hence approximately inversely proportional to the instantaneous coefficient of friction existing between a road surface and the vehicle wheels comparing means connected to both of said detecting means and adapted for connection to said brake force control means for automatically controlling a release of applied vehicle braking force when the magnitude of said deceleration signal exceeds a reference value that is varied in inverse proportion to said subdeceleration signal.
Claim 5
Dependent Claim
29 words
A skid detector as in claim 2 wherein said subdeceleration detecting means comprises a time differentiating circuit connected to differentiate said deceleration signal from said deceleration detecting circuit means.
Claim 6
Dependent Claim
15 words
A skid detector as in claim 3 wherein said comparing means comprises a differential amplifier.
Claim 7
Dependent Claim
30 words
A skid detector as in claim 3 wherein said comparing means includes an inverting amplifier means for inverting said subdeceleration signal prior to a reference input of said differential amplifier.
Claim 8
Dependent Claim
31 words
A skid detector as in claim 5 wherein said inverting amplifier means includes a voltage divider means for adjusting the input signal level to said reference input of said differential amplifier.