Automatic Pneumatic Braking

Only available on StudyMode
  • Topic: Anti-lock braking system, Electronic stability control, Vehicle braking technologies
  • Pages : 41 (9834 words )
  • Download(s) : 84
  • Published : February 21, 2013
Open Document
Text Preview
Anti-Lock Braking System (ABS) and Anti-Slip Regulation (ASR)

2nd Edition

This publication is not subject to an updating service. New versions can be found in INFORM under www.wabco-auto.com

© Copyright WABCO 2011

Vehicle Control Systems

We reserve the right to make changes Version 002/02.11 815 010 194 3

ABS Training

Table of contents

Anti-Lock Braking System (ABS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Anti-Slip Regulation (ASR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 RSC and ESC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Development . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Theoretical ABS basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Theoretical ASR basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Operation of the ABS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Operation of ASR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 ABS and ASR components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Structure of an EC Air Braking System with ABS / ASR fitted in the towing vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Structure of an air braking system with ABS E (with ESC/RSC) and ASR in the towing vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Structure of an EC Air Braking System with ABS fitted in the trailer / semitrailer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Electronic Control Unit (ECU) 446 003/004 ... 0 on the towing vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 VARIO-C Control Unit for Trailer ABS 446 105 ... 0 . . . . . . . . . . . . . 20 VARIO Compact ABS (VCS) for trailers . . . . . . . . . . . . . . . . . . . . . . 21 VARIO Compact ABS 2. Generation (VCS II) for trailers . . . . . . . . . 22 Rod sensor 441 032 ... 0 and pole wheel . . . . . . . . . . . . . . . . . . . . . 23 ABS Solenoid Valves 472 195 ... 0 . . . . . . . . . . . . . . . . . . . . . . . . . . 25 ABS solenoid relay valve 472 195 02 . 0 or 472 195 04 . 0 . . . . . . . 27 Additional components for ASR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Special functions of the ABS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Testing the Anti-Lock Braking System (ABS) . . . . . . . . . . . . . . . . . . . . . . . 32 Safety circuit, component fault detection and measures to be taken 32 The warning lamps (previously also called safety lamps) . . . . . . . . . 33 Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

2

2

Anti-Lock Braking System (ABS)
Anti-Lock Braking System (ABS)
Purpose

ABS Training

Anti-lock brake systems (ABS) - generally also referred to as anti-lock systems (ALS) - are designed to prevent the vehicle wheels from locking as a result of the service brake being applied with too much force, especially on slippery road surfaces. The idea is to maintain cornering forces on braked wheels to ensure that the vehicle or vehicle combination retains its driving stability and manoeuvrability as far as physically possible. The available power transmission or grip between tyres and carriageway should also be utilised as far as possible to minimise the braking distance and maximise vehicle deceleration.

Why ABS?

Although today commercial vehicle brakes are designed to a very high technical standard, braking on slippery roads often results in potentially dangerous situations. During full or even partial braking on a slippery road it may no longer be possible to fully transfer the braking force onto the...
tracking img