Abs, Traction Control System (Tcs) & Electronic Stability Control (Esc); Antilock Braking System (Abs); Traction Control System (Tcs); Electronic Stability Control (Option) - PREVOST H3-45 VIP Owner's Manual

and the engine brake will progressively engage up
to 100% if the selected cruise speed is exceeded
by approximately 2 km/h (1.25 mph). Manually
switching to engine brake LOW
using the steering wheel switches will deactivate
the cruise control.
CRUISE ENGINE
CONTROL BRAKE
& SPEED MODE
+
CRUISE
SPEED SET
+ 2 Km/h
FIGURE 2: ENGINE BRAKE FORCE APPLIED WITH
CRUISE CONTROL
NOTE
On vehicles equipped
transmission, if cruise control is enabled, the
current engine brake mode is saved in the
vehicle computer (MCM) memory and the engine
brake mode is set to Auto mode
cruise control is disabled, the engine brake mode
changes back to the mode saved in the MCM
memory.
ABS, TRACTION CONTROL SYSTEM
(TCS) & ELECTRONIC STABILITY
CONTROL (ESC)

ANTILOCK BRAKING SYSTEM (ABS)

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
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
or HIGH
ENGINE
BRAKE
FORCE
0%
UP TO
100%
N/A
N/A
with the Allison
. When the
and more generally
PA-1619 Owner's Manual H3-45 VIP
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, drive and tag axles constantly
measure wheel speed during braking. This
information is transmitted to a six- 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.

TRACTION CONTROL SYSTEM (TCS)

TCS controls
acceleration to improve traction.
The TCS system will intervene automatically
l
and apply braking pressure to a spinning
wheel transferring engine power to the other
drive wheel that have better traction. This
feature is active only at speeds below 25 mph
(40 km/h).
If all of the drive wheels begin to spin, the
l
TCS system will reduce engine throttle to
improve traction at all of the drive wheels.
If drive wheels begin to lose traction during
acceleration, TCS will engage automatically to
assist the driver in accelerating the vehicle. The
TCS icon in the DID will flash rapidly to let you
know whenever TCS is actively functioning.

ELECTRONIC STABILITY CONTROL (OPTION)

The Electronic Stability Control (ESC) is a feature
for ABS-equipped vehicles that reduces the risk of
rollovers and loss of control. The ESC system
features include the RSP Roll Stability Program
in
and Yaw Control.
Other Features 5-27
wheel spin during vehicle