# US 6,295,499 B1 · Method of improving ABS control behavior

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- Number: US 6,295,499 B1
- Document ID: US6295499B1
- Status: Granted
- Kind: B1
- Application number: 09/230,136
- Filed: 2000-04-28
- Granted: 2001-09-25
- Earliest claimed: 1996-07-18
- Assignees: Continental Teves AG & Co. oHG
- Inventors: Ivica Batistic
- Web page: https://patentgrep.com/patent/US6295499B1

## CPC

- B60T 8/1755: Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve (road vehicle drive control systems for control of driving stability otherwise than by controlling a particular sub-unit B60W30/02)
- B60T 2201/16: Curve braking control, e.g. turn control within ABS control algorithm
- 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

To improve the steerability and driving stability in a curve, in an automotive vehicle furnished with an anti-lock control system, a special control mode is initiated upon identifying a cornering situation. In special circumstances, errors in identification may be unavoidable. To overcome the disadvantageous effects of such an identification in error, in the practice of the invention, re-acceleration (ai) of wheel (i) from which pressure is erroneously relieved is analyzed and brake pressure applied as long as an acceleration threshold value (alimit1,2) is exceeded.

## Claims

### Claim 1

A method of improving the control behavior of an anti-lock system of a four-wheel, two-axle vehicle, comprising the steps of:
measuring individual wheel speeds;
deriving a vehicle reference speed;
obtaining criteria for identifying a cornering situation and the direction of the curve from the rotating behavior of the vehicle wheels;
upon identifying a cornering situation, in lieu of a standard control mode, initiating a special control mode which already in a partial braking range causes a reduction of brake pressure on at least one wheel;
upon initiation of the special control mode, analyzing re-acceleration of the at least one wheel, to determine an “error in identification”; and
applying brake pressure to the at least one wheel as long as re-acceleration of the at least one wheel exceeds a predetermined threshold value.

### Claim 2 (depends on 1)

A method according to claim 1, wherein the period during which brake pressure is applied, is dimensioned in accordance with the formula
tDAi=k1*(a1−alimit1),
wherein i=1 . . . 4
with a threshold value alimit1 in the range of between 2 g and 5 g being selected for the re-acceleration ai.

### Claim 3 (depends on 1)

A method according to claim 1, wherein the brake pressure in the event of special control is applied by pulse-wise actuating and opening an electrically actuable inlet valve, and the duration of the brake pressure application in a first pressure build-up pulse is dimensioned in accordance with the formula
tDAi=k1*(ai−alimit1),
wherein i=1 . . . 4
with a first threshold value alimit1 in the range of between 2 g and 5 g being selected for the re-acceleration ai of the at least one wheel, and that a pressure build-up pulse following the first pressure build-up pulse triggered at a first re-acceleration above the first threshold value alimit1 is extended by an additional time span tDAi determined by a second threshold value alimit2, wherein
tDAi=k2*(ai−alimit2),
and
alimit2 is in the range between 1.5 g and 2.5 g.