PREVOST LE MIRAGE XLII BUS SHELLS Maintenance Manual Download

Page: 388 / 1260

Section 12: BRAKE AND AIR SYSTEM

PA1564

30. AUTOMATIC TRACTION CONTROL (ATC)
– ELECTRONIC STABILITY PROGRAM (ESP)

In addition to the ABS function, advanced
models of Bendix EC-60 controllers provide an

Automatic Traction Control (ATC)

feature.

Bendix ATC can improve vehicle traction during
acceleration, and lateral stability while
accelerating through curves. ATC utilizes

Engine Torque Limiting (ETL)

where the ECU

communicates with the engine’s controller
and/or

Differential Braking (DB)

where

individual wheel brake applications are used to
improve vehicle traction.

The EC-60 advanced model controller also
provide ABS-based stability features referred to
as

ESP

Electronic Stability Program

The Bendix ESP system is an ABS-based
stability system that enhances vehicle stability
by both reducing engine throttle and by applying
vehicle braking based on actual vehicle
dynamics. Accordingly, the ESP system is
available only on specific approved vehicle
platforms after vehicle application and
development efforts and validation testing. Only
certain limited variations of an approved vehicle
platform are permitted without further validation
of the ESP system application.

ESP stability system consists of Yaw Control
(YC) and Roll Stability Program (RSP) features.

CAUTION

Even with ESP-equipped vehicles, the driver
remains responsible for ensuring vehicle
stability during operation.

30.1 COMPONENTS

30.1.1 The EC-60

controller’s ABS function

utilizes the following components:

•

Six (6) Bendix

WS-24

wheel speed

sensors. Each sensor is installed with a
Bendix Sensor Clamping Sleeve;

•

Five (5) Bendix

Pressure Modulator

Valves (M-32QR

);

•

Dash-mounted vehicle ABS Indicator

Lamp;

•

Service brake relay valve;

•

Dash-mounted trailer ABS Indicator Lamp.

30.1.2 The EC-60

controller’s ATC function

utilizes the following components:

•

Drive axle traction control valve;

•

Dash-mounted ATC status/indicator lamp;

•

J1939 serial communication to engine

control module.

30.1.3 The EC-60

controller’s ESP/RSP

function utilizes the following components:

•

Front Axle Traction Control Valve integral

to the service brake relay valve;

•

Dash-mounted ESP status/indicator lamp

(also serves as the ATC status/indicator
lamp;

•

Bendix

SAS-60

Steering Angle Sensor

(mounted to the steering column);

•

Bendix YAS-60TM Yaw Rate/Lateral

Acceleration Sensor (mounted to a cross
member forward of the drive axle);

•

Brake Demand Sensors (installed in the

primary and secondary delivery circuits);

•

Load Sensor (installed in the suspension

air spring;

•

An additional Modulator Valve (Bendix

M-32QR

Pressure Modulator Valve) that

controls pressure apply to the trailer
brakes during system intervention.

30.1.4 Bendix

M-32QR

Pressure Modulator

Valves (PMV)

This Bendix

M-32QR

Pressure Modulator

Valves (PMV) is operated by the EC-60

controller to modify driver applied air pressure to
the service brakes during ABS, ATC, RSP or YC
activation. The PMV is an electro pneumatic
control valve and is the last valve that air passes
through on its way to the brake chamber. The
modulator hold and release solenoids are
activated to “modulate” or “control” the brake
pressure during an antilock braking event. The
hold solenoid is normally open and the release
solenoid is normally closed, such that the PMV
nominally allows air to flow through. This design
allows for air delivery to brake chambers in the
event of electrical trouble.

PREVOST LE MIRAGE XLII BUS SHELLS, Maintenance Manual

Search results

Summary of Contents for LE MIRAGE XLII BUS SHELLS

Reviews:

Related manuals for LE MIRAGE XLII BUS SHELLS

Brands by name

Popular brands