Control system

Claim 2

In an antilocking control system for vehicle brakes of the type having a brake pressure source, a wheel and associated braking member, and pressure control means for controlling the brake pressure applied to said braking member, the improvement comprising, in combination: sensor means for actuating said pressure control means in accord with changes in rotational speed of the wheel, said sensor means including a plurality of switches responsive to different states of change in rotational speed of the wheel; a pair of conductors connected to said switches; and a control circuit connected to said conductors and responsive to different signals to actuate said pressure control means correspondingly, said control circuit including a discriminator circuit having a plurality of switch elements responsive to said different signals; said switches being connected in parallel and including impedance means in series with individual switches to produce said different signals.

Claim 3

In the system as defined in claim 1 wherein said switch elements comprise switching amplifiers having different switching thresholds corresponding to said different signals.

Claim 4

In the system as defined in claim 2 wherein said switching amplifiers are transistors.

Claim 5

In the system as defined in claim 3 wherein at least some of said transistors have zener diodes at their inputs, said zener diodes having different zener voltages.

Claim 6

In the system according to claim 1 wherein one of said switch elements of said discriminator circuit constitutes a diode and another of said switch elements is a transistor having its output connected to said diode.

Claim 7

In an antilocking control system for vehicle brakes of the type having a brake pressure source, a wheel and associated braking member, a normally open inlet valve connecting the braking member to said brake pressure source, pressure reducing means for selectively reducing the brake pressure at said braking member, and a sensor for detecting changes in rotational speed of the wheel, the improvement comprising, in combination; a control circuit for actuating said inlet valve and said pressure reducing means, said control circuit including a first switching means for closing said inlet valve in response to a first threshold of wheel deceleration, a second switching means responsive to a second threshold of wheel deceleration, a third switching means responsive to wheel acceleration, and a bistable device controlling said pressure reducing means, said bistable device having said second and third switching means as inputs thereto; said sensor having first, second and third switches for respectively actuating said first, second and third switching means, said switches being connected in parallel; a pair of conductors connecting said switches to said control circuit; and resistor means in series with individual ones of said switches, said resistor means having different values for each switch.

Claim 8

In an antilocking control system for vehicle brakes of the type having a brake pressure source, a wheel and associated braking member, a normally open inlet valve connecting the braking member to said brake pressure source, pressure reducing means for selectively reducing the brake pressure at said braking member, and a sensor for detecting changes in rotational speed of the wheel, the improvement comprising, in combination; a control circuit for actuating said inlet valve and said pressure reducing means, said control circuit including a first switching means for closing said inlet valve in response to a first threshold of wheel deceleration, a second switching means responsive to a second threshold of wheel deceleration, a third switching means responsive to wheel acceleration, and a bistable device controlling said pressure reducing means, said bistable device having said second and third switching means as inputs thereto; said sensor having first, second and third switches for respectively actuating said first, second and third switching means, said switches being connected in parallel; a pair of conductors connecting said switches to said control circuit; and resistor means in series with individual ones of said switches, said resistor means having different values for each switch.

Claim 9

In the system as defined in claim 6 wherein said switching means are transistors actuated between conductive and nonconductive states.

Claim 10

In the system as defined in claim 6 wherein said first switch actuates said first switching means, said second switch actuates said first and second switching means, and said third switch actuates said first, second and third switching means.

Claim 11

In the system as defined in claim 8 wherein said first and second switching means are transistors, said third switching means comprising a diode connected between the input to said bistable device and said third switch.

Claim 12

In an antilocking control system for vehicle brakes of the type having a brake pressure source, a wheel and associated braking member, and pressure control means for controlling the brake pressure applied to said braking member, the improvement comprising, in combination: sensor means for actuating said pressure control means in accord with changes in the rotational speed of the wheel, said sensor means including a plurality of switches responsive to diFferent states of change in rotational speed of the wheel; a pair of conductors connected to said switches; and a control circuit connected to said conductors and responsive to different signals to actuate said pressure control means correspondingly, said control circuit including a power stage for said pressure control means and a flip-flop for actuating said power stage and having a single input connected thereto; said switches being connected in parallel and including impedance means in series with individual switches to produce said different signals.

Claim 13

In an antilocking control system for vehicle brakes of the type having a brake pressure source, a wheel and associated braking member, and pressure control means for controlling the brake pressure applied to said braking member, the improvement comprising, in combination: sensor means for actuating said pressure control means in accord with changes in the rotational speed of the wheel, said sensor means including a plurality of switches responsive to diFferent states of change in rotational speed of the wheel; a pair of conductors connected to said switches; and a control circuit connected to said conductors and responsive to different signals to actuate said pressure control means correspondingly, said control circuit including a power stage for said pressure control means and a flip-flop for actuating said power stage and having a single input connected thereto; said switches being connected in parallel and including impedance means in series with individual switches to produce said different signals.