PREVOST X3-45 2011 Operator'S Manual Download

Page: 115 / 214

Other

Features

109

To switch to the engine brake Auto mode
when the engine brake is already engaged in
Low

or High

braking power, simply press

the Engine Brake OFF switch located on the
steering wheel.

ANTILOCK BRAKING SYSTEM

(ABS)

– [AUTOMATIC TRACTION CONTROL
(ATC) – ELECTRONIC STABILITY
PROGRAM (ESP) (OPTIONAL)]

The purpose of the Antilock Braking System
(ABS) is to maintain vehicle stability and control
during braking and to minimize the stopping
distance in any road condition.

On slippery roads and more generally in
emergency situations, over-braking frequently
induces wheel locking. Wheel locking greatly
increases breaking distance on any road
surface. Locked wheels also impede directional
control and cause severe tire abrasion. An
antilock braking system provides maximum
braking performance while maintaining
adequate control on slippery roads.
The basis of ABS is constant monitoring of
wheel parameters during braking. Sensors on
each wheel of the front and drive axles
constantly measure wheel speed during braking.
This information is transmitted to a four-channel
electronic processor which senses when any
wheel is about to lock. Modulating valves
quickly adjust brake pressure (up to 5 times
every second) to prevent wheel lock. Each
wheel is therefore controlled according to the
available grip.
In this way, the vehicle is brought to a stop in the
shortest possible time while remaining stable
and under the driver's control.

WARNING

Vehicles following ABS-equipped vehicles
may not be able to brake as fast on slippery
roads.

In addition to the ABS function, advanced
models of Bendix controllers may be installed
(Optional) to provide an

Automatic Traction

Control (ATC)

feature and also provide ABS-

based stability features referred to as

ESP



Electronic Stability Program

. 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 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.

WARNING

In the case where a vehicle equipped with the
ESP system pulls a trailer, the latter must be
equipped with ABS.

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.

DRIVER CONTROLLED
DIFFERENTIAL LOCK (DCDL)

By actuating the electric switch, the driver can
lock or unlock differential action.

The purpose of the DCDL is to provide
maximum vehicle traction and control on
unfavorable road or highway surfaces. When the
DCDL is actuated, a clutch collar completely
locks the differential case, gearing, and axle
shafts together. This feature maximizes traction
to both wheels. The lock position will also
protect against spinout damage to the
differential. The DCDL should not be actuated
when favorable road conditions exist.

OPERATION TIPS

1. The DCDL can be locked or unlocked if the

vehicle is standing still or moving at a
constant low speed when the wheels are not
spinning, slipping, or losing traction.

2. When the DCDL is locked, operate the

vehicle at low speeds. DCDL will not engage