Vehicle brake control device

Patent metadata

Field	Value
Publication number	US-9517759-B2
Application number	US-201214438417-A
Country	US
Kind code	B2
Filing date	Oct 30, 2012
Priority date	Oct 30, 2012
Publication date	Dec 13, 2016
Grant date	Dec 13, 2016

Abstract

A brake control device includes a front-wheel left-right communication passage that allows communication between wheel cylinders for a front-left wheel and a front-right wheel via a front-wheel communication on-off valve, and a rear-wheel left-right communication passage that allows communication between wheel cylinders for a rear-left wheel and a rear-right wheel via a rear-wheel communication on-off valve. The brake control device executes a hydraulic control by keeping the front-wheel communication on-off valve and the rear-wheel communication on-off valve opened. The front-wheel communication on-off valve is a normally closed type, and the rear-wheel communication on-off valve is a normally opened type.

First claim

The invention claimed is:

1. A vehicle brake control device including:
wheel cylinders, each of which is provided to each of front-left, front-right, rear-left, and rear-right wheels for receiving a hydraulic pressure of operating fluid to apply braking force to the wheels;
a power hydraulic pressure generating device that generates a hydraulic pressure even if a brake operation is not performed;
individual linear control valve devices, each of which is provided to an individual passage of operating fluid leading into each of the wheel cylinders from the power hydraulic pressure generating device for independently adjusting a hydraulic pressure of each of the wheel cylinders;
a master cylinder that generates a first pedal effort hydraulic pressure and a second pedal effort hydraulic pressure by using a pedal effort caused by a driver's depressing operation on a brake pedal;
a master hydraulic path including a first pedal effort hydraulic pressure path that supplies the first pedal effort hydraulic pressure to the wheel cylinder for either one of the front-left and front-right wheels, and a second pedal effort hydraulic pressure path that supplies the second pedal effort hydraulic pressure to the wheel cylinder for the other front wheel;
a master cut valve device that includes a first on-off valve opening and closing the first pedal effort hydraulic path, and a second on-off valve opening and closing the second pedal effort hydraulic path, the first on-off valve and the second on-off valve being a normally opened valve that keeps opened upon non-energization and is closed by energization; and
a hydraulic control unit that controls energization of the individual linear control valve devices to control the hydraulic pressure of each of the wheel cylinders with the first on-off valve and the second on-off valve of the master cut valve device closed,
the brake control device comprising:
a front-wheel left-right communication passage that allows communication between the individual passage, which is located between the wheel cylinder for the front-left wheel and the individual linear control valve device, and the individual passage, which is located between the wheel cylinder for the front-right wheel and the individual linear control valve device, via a front-wheel communication on-off valve;
a rear-wheel left-right communication passage that allows communication between the individual passage, which is located between the wheel cylinder for the rear-left wheel and the individual linear control valve device, and the individual passage, which is located between the wheel cylinder for the rear-right wheel and the individual linear control valve device, via a rear-wheel communication on-off valve; and
a communication control unit that allows the front-wheel communication on-off valve and the rear-wheel communication on-off valve to be opened during a hydraulic control by the hydraulic control unit, wherein
the front-wheel communication on-off valve is a normally closed valve that keeps closed upon non-energization and is opened due to energization, and the rear-wheel communication on-off valve is a normally opened valve that keeps opened upon non-energization and is closed due to energization.

2. A vehicle brake control device according to claim 1 , further comprising:
a front-rear communication passage that allows communication between the individual passage, which is located between the wheel cylinder of either one of the front-left and front-right wheels and the individual linear control valve device, and the individual passage, which is located between the wheel cylinder of either one of the rear-left and rear-right wheels and the individual linear control valve device, via a front-rear communication on-off valve, wherein
the front-rear communication on-off valve is a normally closed valve that keeps closed upon non-energization and is opened due to energization, and
the communication control unit opens the front-wheel communication on-off valve, the rear-wheel communication on-off valve, and the front-rear communication on-off valve during the hydraulic control by the hydraulic control unit.

3. A vehicle brake control device according to claim 1 , wherein
the hydraulic control unit deactivates some of the individual linear control valve devices, and activates the remaining individual linear control valve devices during the normal brake control, upon controlling the hydraulic pressure of each wheel cylinder.

4. A vehicle brake control device according to claim 2 , wherein
the hydraulic control unit deactivates some of the individual linear control valve devices, and activates the remaining individual linear control valve devices during the normal brake control, upon controlling the hydraulic pressure of each wheel cylinder.

Assignees

• Miyazaki Tetsuya
• Nimura Kazunori
• Toyota Motor Co Ltd

Inventors

• Miyazaki Tetsuya
• Nimura Kazunori

Classifications

• B60T13/142

  Systems with master cylinder · CPC title

• B60T13/147

  In combination with distributor valve · CPC title

• B60T8/348

  4 Channel systems (B60T8/345 takes precedence) · CPC title

• B60T13/662

  characterised by specified functions of the control system components · CPC title

• B60T8/367

  Seat valves, e.g. poppet valves · CPC title