# US 5,700,070 A · Vehicle brake control device

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- Number: US 5,700,070 A
- Document ID: US5700070A
- Status: Granted
- Kind: A
- Application number: 08/514,296
- Filed: 1995-08-11
- Granted: 1997-12-23
- Earliest claimed: 1994-08-16
- Assignees: Nisshinbo Industries, Inc.
- Inventors: Koji Sakai
- Web page: https://patentgrep.com/patent/US5700070A

## CPC

- B60T 8/4291: {having means to reduce or eliminate pedal kick-back}
- B60T 8/4872: {pump-back systems}
- B60T 8/5037: {closed systems}
- Y10S 303/90: ABS throttle control
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A vehicle brake control device is provided which effectively reduces the noise and pulsation, while securing a pressure boost during anti-skid control and traction control. The brake control device is comprised of a main brake line routed through the master cylinder 13, inlet valve 25, and the wheel cylinder 26, wherein an accumulator 24 to store the hydraulic pressure is installed in the brake line between the master cylinder 13 and wheel cylinder 26.

## Claims

### Claim 1

A vehicle brake control device used for anti-skid control or traction control, comprising:
a main brake line routed through a master cylinder;
an inlet valve; and
a wheel cylinder;
wherein an accumulator for storing hydraulic pressure is installed in the main brake line between the master cylinder and the wheel cylinder, said accumulator being of an extremely small capacity which varies the brake pressure of the wheel cylinder by at most a few atmospheres.

### Claim 2

A vehicle brake control device used for anti-skid control or traction control, comprising:
a main brake line routed through a master cylinder;
an inlet valve;
a wheel cylinder;
wherein a switching valve for switching between a non-constricted line and a constricted line, or a restrictor, is positioned in the main brake line between the master cylinder and the wheel cylinder; and
an accumulator for storing hydraulic pressure is installed between the inlet valve and the switching valve or restrictor.

### Claim 3 (depends on 2)

A vehicle brake control device as claimed in claim 2, wherein the accumulator is of an extremely small capacity which varies the brake pressure of the wheel cylinder by at most a few atmospheres.

### Claim 4

A vehicle brake control device used for anti-skid control or traction control, comprising:
a main brake line routed through a master cylinder;
an inlet valve;
a wheel cylinder; and
an accumulator means for adjusting a pressure boost arising from a pulsing action of the inlet valve to a prescribed value and for storing hydraulic pressure is installed in the main brake line between the master cylinder and the wheel cylinder, said accumulator means being of an extremely small capacity which varies the brake pressure of the wheel cylinder by at most a few atmospheres.

### Claim 5

A vehicle brake control device used for anti-skid control or traction control, comprising:
a main brake line routed through a master cylinder;
an inlet valve;
a wheel cylinder;
wherein a switching valve for switching between a non-constricted line and a constricted line, or a restrictor, is positioned in the main brake line between the master cylinder and the wheel cylinder; and
an accumulator means for adjusting a pressure boost arising from a pulsing action of the inlet valve to a prescribed value and for storing hydraulic pressure is installed between the inlet valve and the switching valve or restrictor.

### Claim 6 (depends on 5)

A vehicle brake control device as claimed in claim 5, wherein the accumulator means is of an extremely small capacity which varies the brake pressure of the wheel cylinder by at most a few atmospheres.

### Claim 7

A vehicle brake control system used for anti-skid control or traction control, in combination with a brake system, said brake system comprising:
a master cylinder,
a wheel cylinder,
a main brake line routed between said master cylinder and said wheel cylinder;
an inlet valve in said main brake line before said wheel cylinder,
an outlet valve,
a pump having a suction inlet connected to said outlet valve, and
a reflux line routed from the wheel cylinder through said outlet valve and said pump arranged in parallel with the inlet valve, an outlet of the pump being connected to a master cylinder side of the main brake line;
said control system comprising:
an accumulator for storing hydraulic pressure installed in the main brake line between the master cylinder and the wheel cylinder.

### Claim 8 (depends on 7)

A vehicle brake control system used for anti-skid control or traction control, in combination with a brake system as claimed in claim 7, said control system further comprising:
a switching valve for switching between a non-constricted line and a constricted line, or a restrictor, positioned in the main brake line between the master cylinder and the wheel cylinder;
wherein said accumulator is installed in the main brake line between the inlet valve and the switching valve or restrictor.

### Claim 9 (depends on 7, 8)

A vehicle brake control system as claimed in claim 7 or claim 8, wherein the accumulator is of an extremely small capacity which varies the brake pressure of the wheel cylinder by at most a few atmospheres.