Brake control system

Claim 2

Brake control system for a vehicle having plurality of wheels and an operator-controlled brake associated with each wheel comprising, means associated with one wheel for generating a first signal, the frequency of which is proportional to the angular velocity of said wheel, first and second means for independently averaging said first signal and generating second and third signals indicative, respectively, of said averages, said first means being effective to average said signal more rapidly than said second means whereby upon a decrease in the frequency of said first signal in excess of predetermined rate a difference between said second and third signals is created, and means responsive to said difference to reduce the braking effort at said one wheel when the brakes are applied.

Claim 3

Brake control system for a vehicle having a plurality of wheels and an operator-controlled airbrake adapted to be connected to a source of air under pressure, one brake being associated with each wheel comprising, an air-operated transducer associated with at least one wheel, said transducer being connected to said source of air under pressure and being effective to generate an air pulse signal, the frequency of which is proportional to the angular velocity of said wheel, first and second air containers to which said first signal is delivered, said containers being of different size and being effective to average said first signal at different rates and generating, respectively, second and third signals indicative of said averages whereby upon a decrease in the frequency of said first signal in excess of a predetermined rate a differential between said second and third signals is generated, and means responsive to said differential to reduce the braking effort at said one wheel during brake application.

Claim 4

Brake control system for a vehicle having a plurality of wheels and an operator-controlled airbrake adapted to be connected to a source of air under pressure, one brake being associated with each wheel comprising, an air-operated transducer associated with at least one wheel, said transducer being connected to said source of air under pressure and being effective to generate an air pulse signal, the frequency of which is proportional to the angular velocity of said wheel, first and second air containers to which said first signal is delivered, said containers being of different size and being effective to average said first signal at different rates and generating, respectively, second and third signals indicative of said averages whereby upon a decrease in the frequency of said first signal in excess of a predetermined rate a differential between said second and third signals is generated, and means responsive to said differential to reduce the braking effort at said one wheel during brake application.

Claim 5

The brake control system according to claim 2 wherein said last-mentioned means includes a Schmitt trigger to which said second and third signals are delivered.

Claim 6

Brake control system for a vehicle having a plurality of wheels and an operator-controlled airbrake adapted to be connected to a source of air under pressure, one brake being associated with each wheel, comprising, an air-operated transducer associated with at least one wheel, said transducer being connected to said source of air under pressure aNd being effective to generate an air pulse signal, the frequency of which is proportional to the angular velocity of said wheel, first and second air containers to which said first signal is delivered, said containers being of different size and being effective to average said first signal at different rates and generating, respectively, second and third signals indicative of said averages whereby upon a rapid decrease in the frequency of said first signal, the relatively repaid decrease in the pressure in said smaller container establishes a differential between said second and third signals, means responsive to said differential to generate a control signal effective to reduce the braking effort at said one wheel during brake application to thereby increase the frequency of said first signal, the resulting relatively rapid increase in the pressure in said smaller container eliminating said differential and terminating said control signal, and means effective upon termination of said control signal to increase the pressure in said larger container.

Claim 7

Brake control system for a vehicle having a plurality of wheels and an operator-controlled airbrake adapted to be connected to a source of air under pressure, one brake being associated with each wheel, comprising, an air-operated transducer associated with at least one wheel, said transducer being connected to said source of air under pressure aNd being effective to generate an air pulse signal, the frequency of which is proportional to the angular velocity of said wheel, first and second air containers to which said first signal is delivered, said containers being of different size and being effective to average said first signal at different rates and generating, respectively, second and third signals indicative of said averages whereby upon a rapid decrease in the frequency of said first signal, the relatively repaid decrease in the pressure in said smaller container establishes a differential between said second and third signals, means responsive to said differential to generate a control signal effective to reduce the braking effort at said one wheel during brake application to thereby increase the frequency of said first signal, the resulting relatively rapid increase in the pressure in said smaller container eliminating said differential and terminating said control signal, and means effective upon termination of said control signal to increase the pressure in said larger container.

Claim 8

A fluidics control system comprising first and second containers of different size, means for supplying a variable frequency air pulse signal to each container, the containers averaging said signals at different rates, a Schmitt trigger connected to compare the pressures in said containers and deliver an output signal whenever the pressure in said smaller container is less than the pressure in said larger container by a predetermined amount as a result of a rapid decrease in the frequency of said input signal, means responsive to said output signal to increase the frequency of said input signal to recharge the containers, the rate of recharge of said smaller container being more rapid than the rate of recharge of said larger container, said output signal being terminated when said smaller container is recharged to the level of said larger container, and means responsive to the termination of said output signal to augment the rate of recharge of said larger container.

Claim 9

A fluidics control system comprising first and second containers of different size, means for supplying a variable frequency air pulse signal to each container, the containers averaging said signals at different rates, a Schmitt trigger connected to compare the pressures in said containers and deliver an output signal whenever the pressure in said smaller container is less than the pressure in said larger container by a predetermined amount as a result of a rapid decrease in the frequency of said input signal, means responsive to said output signal to increase the frequency of said input signal to recharge the containers, the rate of recharge of said smaller container being more rapid than the rate of recharge of said larger container, said output signal being terminated when said smaller container is recharged to the level of said larger container, and means responsive to the termination of said output signal to augment the rate of recharge of said larger container.

Claim 10

A brake control system for a vehicle having a plurality of wheels and an operator-controlled brake associated with each wheel comprising, means associated with at least one wheel for generating a first frequency modulated fluid signal the instantaneous frequency of which is a function of the instantaneous angular velocity of said wheel, fluidic means responsive to a predetermined decrease in the frequency of said first fluid signal in excess of a predetermined norm to generate a control signal, and means responsive to said control signal to reduce the braking effort to said one wheel during brake application.

Claim 11

A brake control system for a vehicle having a plurality of wheels and an operator-controlled brake associated with each wheel comprising, means associated with at least one wheel for generating a first frequency modulated fluid signal the instantaneous frequency of which is a function of the instantaneous angular velocity of said wheel, fluidic means responsive to a predetermined decrease in the frequency of said first fluid signal in excess of a predetermined norm to generate a control signal, and means responsive to said control signal to reduce the braking effort to said one wheel during brake application.

Claim 12

A brake control system for a vehicle having a plurality of wheels and an operator-controlled brake associated with each wheel comprising, first fluidic means associated with one wheel and effective when said brakes are applied to generate a first frequency modulated fluidic control signal when the deceleration of said one wheel exceeds a predetermined amount, means responsive to said first fluidic control signal to reduce the braking effort at said one wheel, second fluidic means associated with another wheel and effective when said brakes are applied to generate a second fluidic control signal when the deceleration of said other wheel exceeds a predetermined amount, and means responsive to said second fluidic control signal to reduce the braking effort at said other wheel.

Claim 13

A brake control system for a vehicle having a plurality of wheels and an operator-controlled brake associated with each wheel comprising, first fluidic means associated with one wheel and effective when said brakes are applied to generate a first frequency modulated fluidic control signal when the deceleration of said one wheel exceeds a predetermined amount, means responsive to said first fluidic control signal to reduce the braking effort at said one wheel, second fluidic means associated with another wheel and effective when said brakes are applied to generate a second fluidic control signal when the deceleration of said other wheel exceeds a predetermined amount, and means responsive to said second fluidic control signal to reduce the braking effort at said other wheel.