ELECTRO-HYDRAULIC BRAKING SYSTEM FOR FOUR WHEELER

Submitted by-Rishabh Jain (K11619)

B.Tech Mechanical6th Sem./ 3rd Yr

CONTENTINTRODUCTION

WORKING

FEATURES

ADVANTAGES

APPLICATIONS

INTRODUCTION

Electro-hydraulic brake systems are the combination of electronics and hydraulics to create a more versatile brake system. The electronics provide control flexibility, while the hydraulics supply the power.

1First, the driver’s input is normally interpreted by up to three different devices: a brake switch, a travel sensor, and a pressure sensor while an emulator provides the normal pedal “feel”

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To prevent unwanted brake applications, two of the three inputs must be detected to initiate base brake pressure.

The backup master cylinder is subsequently locked out of the main wheel circuit using isolation solenoid valves, so all wheel brake pressure must come from a high-pressure accumulator source.

This stored energy is created by pressurizing brake fluid from the reservoir with an electrohydraulic pump into a suitable pre-charged vessel. The accumulator pressure is regulated by a separate pressure sensor or other device.

The “by-wire” characteristics now come into play as the driver’s braking intent signals are sent to the ECU. Here an algorithm translates the dynamically changing voltage input signals into the corresponding solenoid valve driver output current waveforms.

As the apply and release valves open and close, a pressure sensor at each wheel continuously “closes the loop” by feeding back information to the ECU so the next series of current commands can be given to the solenoid valves to assure fast and accurate pressure response.

WORKING

FEATURESInterlocking shoes clearance balancing device and shoe auto-aligning device (patented technology), constantly equalize the clearance of brake shoes on both sides and no need to adjust, thus completely avoid one side of brake Lining sticking to brake disc.

Self-lubricating bearings are equipped at main hinge points, which bring high efficiency of transmission, long performance life and unnecessary to lubricate during the course of operation.

The closing time is short (only 0.25-0.4s).

Torque adjustable built-in springs with torque scale and anti-wear linings.

Brake linings are plug-in style, which are easy to replace. Brake linings of various materials such as power metallurgy and semimetals (non-asbestos), which are available for customers to choose. Equipped with new thrusters: Swift reaction and having long life-span.

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ADVANTAGES

Manual release levers.

Release limit switches, which can indicate signals such as whether brake is properly released or provide interlocking protection.

Lining wear limit switches can automatically indicate alarm signal or provide interlocking protection when wear of brake lining is reaching the limit.

APPLICATIONS

Electro-hydraulic disc brakes are used well for decelerating and stop/braking large-scale modern machines such as loading and unloading machinery, lifting and transporting machinery, metallurgy equipment and mining equipment.

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