# US 9,751,509 B2 · Vehicle brake control device

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- Number: US 9,751,509 B2
- Document ID: US9751509B2
- Status: Granted
- Kind: B2
- Application number: 14/654,732
- Filed: 2013-12-25
- Published: 2016-07-07
- Granted: 2017-09-05
- Earliest claimed: 2012-12-25
- Assignees: Advics Co., Ltd.
- Applicants: Advics Co., Ltd.
- Inventors: Masato Terasaka; Shinji Tsukamoto
- Web page: https://patentgrep.com/patent/US9751509B2

## CPC

- B60T 8/1764: Regulation during travel on surface with different coefficients of friction, e.g. between left and right sides, mu-split {or between front and rear}
- B60T 8/17551: {determining control parameters related to vehicle stability used in the regulation, e.g. by calculations involving measured or detected parameters}
- 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

## Abstract

A vehicle brake control device performs select-low anti-lock brake control. In the select-low anti-lock brake control, in a decrease period, in which braking force on a first wheel that is one of left and right wheels that has a lower wheel speed is decreased, braking force on a second wheel that is one of the left and right wheels that has a higher wheel speed is also decreased. In an increase period, in which the braking force on the first wheel is increased, the braking force on the second wheel is also increased. The vehicle brake control device is configured such that, when performing the anti-lock brake control, the vehicle brake device sets the braking force on the second wheel to be greater when the tendency for instability in the vehicle behavior is small than when such tendency is large.

## Claims

### Claim 1

A vehicle brake control device that performs select-low anti-lock brake control, in which
in a decrease period, in which braking force on a first wheel that is one of right and left wheels that has a lower wheel speed is decreased, braking force on a second wheel that is one of the right and left wheels that has a higher wheel speed is also decreased, and
in an increase period, in which the braking force on the first wheel increased, the braking force on the second wheel is also increased
wherein the vehicle brake control device is configured such that, when performing the anti-lock brake control, the vehicle brake control device sets the braking force on the second wheel to be greater when a tendency for instability in the behavior of the vehicle is small than when such tendency is large.

### Claim 2 (depends on 1)

The vehicle brake control device according to claim 1, wherein a decrease amount of the braking force on the second wheel in the decrease period is set to be smaller when the tendency for instability in the vehicle behavior is small than when such tendency is large.

### Claim 3 (depends on 2)

The vehicle brake control device according to claim 2, wherein
the decrease amount of the braking force on the second wheel in the decrease period is set by multiplying a preset basic decrease amount by a decrease correction coefficient, and
the decrease correction coefficient is set to be smaller when the tendency for instability in the vehicle behavior is small than when such tendency is large.

### Claim 4 (depends on 1)

The vehicle brake control device according to claim 1, wherein an increase amount of the braking force on the second wheel in the increase period is set to be greater when the tendency for instability in the vehicle behavior is small than when such tendency is large.

### Claim 5 (depends on 4)

The vehicle brake control device according to claim 4, wherein
the increase amount of the braking force on the second wheel in the increase period is set by multiplying a preset basic increase amount by an increase correction coefficient, and
the increase correction coefficient is set to be greater when a tendency for instability in the vehicle behavior is small than when the tendency for instability in the vehicle behavior is large.

### Claim 6 (depends on 1)

The vehicle brake control device according to claim 1, wherein the tendency for instability in the vehicle behavior is determined such that the smaller a difference between a target yaw rate, which is set according to a condition of vehicle operation, and a yaw rate of the vehicle, the smaller the tendency for instability in the vehicle behavior becomes.