ESP
®
is a registered trademark of Daimler and is used by Bendix Commercial Vehicle Systems LLC under license.
©2013 Bendix Commercial Vehicle Systems LLC, a member of the Knorr-Bremse Group. 2/13. All Rights Reserved.
Bulletin No: TCH-013-023 Effective Date: February 19, 2013 Cancels: N/A Page: 2 of 2
magnitude and the length of time of the intervention. A Level One intervention represents the lowest amount of
work, and a Level Five intervention the highest.
In other words, an event of a certain duration, with a given amount of brake force applied by the system, may be
classied at the same intervention level as an event consisting of a shorter duration with a larger applied brake
force, or an intervention with less applied brake force, but of longer duration.
Evaluating Stability Event Counters
While the counters indicate the amount of work performed by the system, many factors must be considered
when attempting to evaluate the data. These include:
• A vehicle with poorly adjusted brakes may display higher intervention levels than a vehicle with properly
adjusted brakes.
• Route, terrain, trafc and weather conditions may all affect the number of interventions logged.
• Mis-installed sensors, and/or incorrectly congured ECUs can cause higher counter values,
Attempts to use the raw data from stability event counters to evaluate situations, vehicles and drivers must be
approached with care. In all situations, the stability event counter should only be viewed as an indicator, and is
not, by itself, a vehicle or driver performance evaluation tool.
The Importance of Antilock Braking System (ABS) Maintenance
Optimal Bendix
®
Wingman
®
Advanced
™
system braking requires a properly maintained ABS system, without any active
ABS Diagnostic Trouble Codes (DTCs). Have active DTCs repaired by a qualied technician. Any ABS DTCs will cause
Wingman Advanced to deactivate.
CAUTION
Even with ESP-equipped vehicles, the driver remains responsible for ensuring vehicle stability during operation. The ESP
system can only function within the limits of physics. ESP functionality mitigates potential vehicle stability incidents, but
cannot prevent them in all cases. Other factors such as driving too fast for road, trafc or weather conditions, oversteering,
an excessively high vehicle Center of Gravity (CG), or poor road conditions can cause vehicle instability that is beyond
the capability of any stability system to mitigate. In addition, the effectiveness of ESP can be greatly reduced on vehicles
towing multiple trailer combinations. For more information, contact your local Bendix representative or the Bendix Technical
Assistance Team at 1-800-AIR-BRAKE (1-800-247-2725).
Reference: Bendix
®
EC-60
™
ABS/ATC/ESP Controllers (Advanced Models) — order SD-13-4869 (BW2429)
Bendix
®
ACom
®
Diagnostics PC software — order BW2329 (Free downloads available on www.bendix.com)
FIGURE 2 - 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 1 - 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.
