# US 5,702,164 A · Traction control through cross-axes oscillation control

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- Number: US 5,702,164 A
- Document ID: US5702164A
- Status: Granted
- Kind: A
- Application number: 08/610,199
- Filed: 1996-03-05
- Granted: 1997-12-30
- Earliest claimed: 1996-03-05
- Assignees: Ford Global Technologies, LLC
- Inventors: Minh N. Tran; Davorin D. Hrovat
- Web page: https://patentgrep.com/patent/US5702164A

## CPC

- B60T 8/175: Brake regulation specially adapted to prevent excessive wheel spin during vehicle acceleration, e.g. for traction control (safety devices for propulsion unit control responsive to, or preventing, skidding of wheels B60K28/16)
- 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

This invention uses cross-axis oscillation control of braking for traction control systems. Changing the amount of braking on each side of the vehicle reduces total wheel slip in a well-controlled, smooth and highly effective manner.

## Claims

### Claim 1

A traction control system for a vehicle having an engine, brakes and a powertrain, said system providing additional traction by providing control of the brakes by alternately braking the driving wheels a different amount in a manner so as to reduce the total amount of wheel slip, comprising the steps of:
determining if a first driving wheel is spinning;
increasing braking of said first driving wheel;
determining if a second driving wheel is spinning above a predetermined amount;
if yes, increasing braking of said second driving wheel for a predetermined pulse duration and completely reducing braking of said first driving wheel;
setting a predetermined second wheel slip trigger level;
setting a first flag if one wheel is spinning;
setting a second flag if the second wheel slip is above the trigger level;
determining if a slip error in the second wheel, expressed as a difference between the second wheel speed and a reference wheel speed, is decreasing below a predetermined level or if the predetermined pulse duration for increased braking of the second driving wheel has expired; and
resetting said first and second flags.