APPARATUS FOR AND METHOD OF CONTROLLING BRAKES
First Claim
1. An apparatus for controlling brakes, comprising:
- a master cylinder;
a wheel-brake cylinder;
a brake booster configured to actuate the master cylinder for a pressure increase of brake fluid in the master cylinder;
a first brake circuit configured to supply brake fluid, which is pressure-increased by the brake booster, to the wheel-brake cylinder;
a first control valve disposed in the first brake circuit for establishing and blocking fluid communication between the master cylinder and the wheel-brake cylinder;
a fluid-pressure source provided for a pressure increase of brake fluid, separately from the brake booster;
a second brake circuit arranged in parallel with the first brake circuit and configured to supply brake fluid, which is pressure-increased by the fluid-pressure source, to the wheel-brake cylinder;
a second control valve disposed in the second brake circuit for establishing and blocking fluid communication between the fluid-pressure source and the wheel-brake cylinder; and
a control unit provided to control operations of the first control valve, the second control valve, and the fluid-pressure source, said control unit configured to selectively control the first control valve and the second control valve when building up wheel-cylinder pressure in the wheel-brake cylinder, and further configured to build up the wheel-cylinder pressure by operating the fluid-pressure source when at least the second control valve is controlled to a valve-open position.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus for controlling brakes, includes a first brake circuit for supplying brake fluid, pressure-increased by a booster, to a wheel-brake cylinder, a first control valve disposed in the first brake circuit for establishing and blocking fluid communication between a master cylinder and the wheel-brake cylinder, a second brake circuit arranged in parallel with the first brake circuit for supplying brake fluid, pressure-increased by a fluid-pressure source, to the wheel-brake cylinder, and a second control valve disposed in the second brake circuit for establishing and blocking fluid communication between the fluid-pressure source and the wheel-brake cylinder. Also provided is a control unit, which is configured to selectively control the first and second control valves when building-up wheel-cylinder pressure, and further configured to build-up the wheel-cylinder pressure by operating the fluid-pressure source when at least the second control valve is controlled to a valve-open position.
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Citations
24 Claims
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1. An apparatus for controlling brakes, comprising:
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a master cylinder; a wheel-brake cylinder; a brake booster configured to actuate the master cylinder for a pressure increase of brake fluid in the master cylinder; a first brake circuit configured to supply brake fluid, which is pressure-increased by the brake booster, to the wheel-brake cylinder; a first control valve disposed in the first brake circuit for establishing and blocking fluid communication between the master cylinder and the wheel-brake cylinder; a fluid-pressure source provided for a pressure increase of brake fluid, separately from the brake booster; a second brake circuit arranged in parallel with the first brake circuit and configured to supply brake fluid, which is pressure-increased by the fluid-pressure source, to the wheel-brake cylinder; a second control valve disposed in the second brake circuit for establishing and blocking fluid communication between the fluid-pressure source and the wheel-brake cylinder; and a control unit provided to control operations of the first control valve, the second control valve, and the fluid-pressure source, said control unit configured to selectively control the first control valve and the second control valve when building up wheel-cylinder pressure in the wheel-brake cylinder, and further configured to build up the wheel-cylinder pressure by operating the fluid-pressure source when at least the second control valve is controlled to a valve-open position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 18, 19, 20, 21)
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15. An apparatus for controlling brakes, comprising:
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a master cylinder; a wheel-brake cylinder; a brake booster configured to actuate the master cylinder for a pressure increase of brake fluid in the master cylinder; a first brake circuit configured to supply brake fluid, which is pressure-increased by the brake booster, to the wheel-brake cylinder; a fluid-pressure source provided for a pressure increase of brake fluid, separately from the brake booster; a second brake circuit arranged in parallel with the first brake circuit and configured to supply brake fluid, which is pressure-increased by the fluid-pressure source, to the wheel-brake cylinder; a manipulated variable detector configured to detect a manipulated variable of the brake pedal; and a control unit configured to select either one of a pressure buildup achieved by the first brake circuit and a pressure buildup achieved by the second brake circuit, wherein, during the pressure buildup achieved by the second brake circuit, the control unit executes brake-by-wire control that automatically pressurizes brake fluid in the wheel-brake cylinder responsively to the detected manipulated variable. - View Dependent Claims (16, 17)
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22. A method of controlling brakes, using a brake control system having a master cylinder, a wheel-brake cylinder, a brake booster configured to actuate the master cylinder for a pressure increase of brake fluid in the master cylinder, a first brake circuit configured to supply brake fluid, which is pressure-increased by the brake booster, to the wheel-brake cylinder, a fluid-pressure source provided for a pressure increase of brake fluid, separately from the brake booster, and a second brake circuit arranged in parallel with the first brake circuit and configured to supply brake fluid, which is pressure-increased by the fluid-pressure source, to the wheel-brake cylinder, comprising:
controlling, responsively to a manipulated variable of a brake pedal, switching among a pressure buildup achieved by only the first brake circuit, a pressure buildup achieved by only the second brake circuit, and a pressure buildup achieved by both the first brake circuit and the second brake circuit. - View Dependent Claims (23, 24)
Specification