Bendix Commercial Vehicle Systems EC-60 ESP CONTROLLERS ADV - Manual (Page 12)

12
Optional ATC Mud/Snow (Off-Road) Mode
In some road conditions, the vehicle operator may desire
additional drive wheel slip when ATC is active. The
Advanced Bendix EC-60 controller has an optional control
mode to permit this desired performance.
The vehicle operator can activate the Mud/Snow function
with a switch on the dash panel. Alternately, a J1939
message may be used to place the vehicle in this mode.
The ATC/ESP Indicator Lamp will flash steadily at a rate
of once every 2.5 seconds to confirm that the ATC mud/
snow mode is engaged.
To exit the ATC Mud/Snow mode, depress and release the
ATC Mud/Snow switch.
Drag Torque Control Functional Overview
Advanced Bendix ® EC-60 ™ controllers have a feature
referred to as drag torque control which reduces wheel slip
on a driven axle due to driveline inertia. This condition is
addressed by increasing the engine torque to overcome
the inertia.
Drag torque control increases vehicle stability on low-
traction road surfaces during down-shifting or retarder
braking.
FIGURE 12 - YAW COnTROL ExAMPLE
A Real World Example Of How Yaw Control
Operates:
Excessive speed exceeds the threshold, creating a
situation where a vehicle is likely to spin and jackknife.
The Bendix ® Yaw Control system reduces engine throttle
and selectively applies brakes to reduce the tendency
to jackknife.
FIGURE 11 - RSP ExAMPLE
A Real World Example
Of How The RSP
System Operates:
Excessive speed for road
conditions creates forces
that exceed the threshold
at which a vehicle is likely
to rollover on a higher-
friction surface.
The system automatically reduces
engine torque and applies the
service brakes (based on the
projected rollover risk) to reduce
the vehicle speed, thereby
reducing the tendency to roll over.
ADVANCED ABS WITH STABILITY
CONTROL
Overview
ESP stability system reduces the risk of rollovers,
jackknifing and other loss-of-control events. ESP features
include Roll Stability Program (RSP) and Yaw Control.
During operation, the ECU of the Bendix Advanced ABS
system constantly compares performance models to the
vehicle’s actual movement, using the wheel speed sensors
of the ABS system, as well as lateral, yaw, and steering
angle sensors. If the vehicle shows a tendency to leave
an appropriate travel path, or if critical threshold values are
approached, the system will intervene to assist the driver.