Antiskid system

Claim 2

In a wheeled vehicle with front and rear wheels having a pressure operated brake system, said brake system comprising: a booster type brake unit; separate actuation means for each wheel of said vehicle, said actuation means being responsive to pressure from said booster type brake unit; sensor means for detecting the rotational velocity of at least one wheel of said wheeled vehicle and generating a sensor output signal for each detected wheel; control means for converting said sensor output signals into a control signal; modulation means interposed between said booster type brake unit and said separate actuation means, said modulation means being operated by said control signal to reduce brake pressure and prevent wheel skidding; proportioning means interposed between said modulation means and said separation actuation means for the rear wheels, said proportioning means automatically redistributing braking effort between the front and rear wheels as a function of load shift; and said modulation means having valve means to operate said modulation means in response to said control signal, said control signal operating said valve means to provide multiple build rates in said brake pressure.

Claim 3

The brake system of claim 1 wherein said control signal is a function of the front wheel turning at the slower velocity.

Claim 4

A braking system for a wheeled vehicle having antiskid control, said system comprising: a brake master cylinder for generating pressurized fluid in response to a brake application; actuating means for applying the brakes of said vehicle braking system in response to said pressurized fluid from said brake master cylinder; sensor means for detecting the rotational velocity of the wheels of said wheeled vehicle, said sensor means generating a signal proportional to said rotational velocity; control means for converting said proportional signal to control signals, said control signals being generated when there is an imminent skid condition; modulator means for removing operator control and varying said pressurized fluid received by said actuation means from said brake master cylinder in response to said control signals being received from said control means; valve means operatively connected to said modulator means wherein said control signals operate said valve means to give multiple pressure build and decay rates in said actuation means; and proportioning means interposed between said modulator means and said actuating means of certain wheels of said wheeled vehicle, said proportioning means automatically redistributing braking effort between said certain wheels and the rest of the wheels of Said wheeled vehicle as a function of load shift.

Claim 5

A braking system for a wheeled vehicle having antiskid control, said system comprising: a brake master cylinder for generating pressurized fluid in response to a brake application; actuating means for applying the brakes of said vehicle braking system in response to said pressurized fluid from said brake master cylinder; sensor means for detecting the rotational velocity of the wheels of said wheeled vehicle, said sensor means generating a signal proportional to said rotational velocity; control means for converting said proportional signal to control signals, said control signals being generated when there is an imminent skid condition; modulator means for removing operator control and varying said pressurized fluid received by said actuation means from said brake master cylinder in response to said control signals being received from said control means; valve means operatively connected to said modulator means wherein said control signals operate said valve means to give multiple pressure build and decay rates in said actuation means; and proportioning means interposed between said modulator means and said actuating means of certain wheels of said wheeled vehicle, said proportioning means automatically redistributing braking effort between said certain wheels and the rest of the wheels of Said wheeled vehicle as a function of load shift.

Claim 6

The braking system having antiskid control, as recited in claim 3, wherein said valve means comprises solenoid valves located at a fluid input and a fluid output of said modulator means, said control signals operating said solenoid valves to give said multiple pressure build and decay rates.

Claim 7

The braking system having antiskid control, as recited in claim 4, wherein said control signals are generated when predetermined rates of change of said rotational velocity have been detected by said control means, said control signals being repeated as long as said predetermined rates of change occur on subsequent cycles of the same brake application.