US 5,297,860 A · Brake control device

Abstract

A brake control device to be used for brake control and traction control of a motor vehicle includes a shuttle valve, a modulator, a traction control valve and a throttle valve. The shuttle valve selects a higher air pressure either from a brake valve, which operates when the brake is applied, or from a traction control valve, which opens during traction control to prevent wheel slippage. The shuttle valve allows the higher of the two air pressures to enter the modulator, which converts the entering air pressure to a brake hydraulic pressure to be supplied to the wheel cylinders of the motor vehicle. The throttle valve provided between the traction control valve and the shuttle valve decreases the air pressure from the traction control valve to be transmitted to the modulator when the traction control is activated. The throttle valve and the shuttle valve cooperate to increase the number of discharge air passages so that the brake control device has a greater discharge capacity when the brakes are released.

Claims11

Dependent claims

A brake control device for providing brake control and traction control for a motor vehicle having a plurality of wheel cylinders, comprising:

a modulator for supplying a braking pressure to at least one of said wheel cylinders;
a brake valve for supplying a first fluid pressure to said modulator for said brake control of said at least one of said wheel cylinders;
a traction control valve for supplying a second fluid pressure to said modulator for said traction control of said at least one of said wheel cylinders;
a valve unit provided between said modulator and said brake and traction control valves and having a shuttle valve and a throttle valve, wherein
said shuttle valve selects the higher one of said first fluid pressure or said second pressure and supplies said higher fluid pressure to said modulator;
and
said throttle valve decreases the fluid flow from said traction control valve to said modulator during traction control while increasing the fluid flow from said modulator to said traction control valve upon release of the brakes of the vehicle.

4 more elements

A brake control device, comprising:

a brake valve provided with a first air pressure for brake control of at least one wheel cylinder;
a modulator mounted between said brake valve and said wheel cylinder for converting said first air pressure to a brake hydraulic pressure to be supplied to said wheel cylinder;
a traction control valve provided with a second air pressure for traction control of said wheel cylinder;
a shuttle valve mounted between said brake valve and said modulator and in air pressure communication with said traction control valve for selectively supplying said modulator with a higher one of said first air pressure from said brake valve or said second air pressure from said traction control valve;
and
a throttle valve mounted between said traction control valve and said shuttle valve, said throttle valve having a throttle valve piston selectively positioned in a first position for reducing the rate of pressure buildup during traction control, or in a second position for increasing the rate of pressure reduction at the time of brake release, said throttle valve piston defining when said throttle valve piston is in said first position, an air pressure path which is relatively narrower than the air pressure path defined by said throttle valve piston when said throttle valve piston is in said second position.

3 more elements

Dependencies are inferred from the claim text.

Brake control device

Life of this patent

Brake control device

Life of this patent

Abstract

Claims11