Browse Prior Art Database

POOR MAN'S ANTI-SKID SYSTEM

IP.com Disclosure Number: IPCOM000006156D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2001-Dec-10
Document File: 2 page(s) / 76K

Publishing Venue

Motorola

Related People

A. F. Petrie: AUTHOR

Abstract

This concept prevents an automobile engine from driving the wheels during braking and causing longer braking distance and uneven braking which can lead to skids, especially during slippery conditions. It completely prevents the problem caused by the driver who steps on the brake and accelerator at the same time.

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MOlOROLA INC. Technical Developments Volume 12 April 1991

POOR MAN'S ANTI-SKID SYSTEM

by A. F, Petrie

  This concept prevents an automobile engine from driving the wheels during braking and causing longer braking distance and uneven braking which can lead to skids, especially during slippery conditions. It completely prevents the problem caused by the driver who steps on the brake and accelerator at the same time.

  Disconnecting the engine during braking also permits more uniform braking action between the driven and non-driven wheels.

  In the past, this kind of operation was difficult to achieve. With the advent of electronically controlled transmissions, it is now possible to perform any action desired. We simply have to detect brake actuation (actuation of the brake light switch or pressure switch), and then decide if the engine is causing a problem with braking to determine if we should disconnect it.

  We would not want to disconnect the engine if we are on a long down hill and the engine were helping with braking. On the other hand, if we were trying to stop on ice while the engine was driving one set of wheels, we would certainly want to disconnect it.

The simple solution is to disconnect the engine only if it is trying to drive the wheels while we are

applying the brake. If we check the slip (difference between input and output speed) on the torque converter, we can easily determine if the engine is driving the wheels or if the wheels are driving the engine...