Bendix Commercial Vehicle Systems TABS-6 ADVANCED SINGLE CHANNEL - Manual (Page 4)

4
4. BENDIX ® TRAILER ROLL STABILITY
PROGRAM (TRSP
®
) OPERATION
WARNING! During a Bendix ® TRSP ® system
intervention, the vehicle automatically decelerates.
The TABS‑6 Adv module can slow the vehicle with or
without the driver applying the brake pedal, and even
when the driver applies the throttle.
WARNING! Even with TRSP system‑equipped
vehicles, the driver remains responsible for ensuring
vehicle stability during operation. The TRSP system
only functions within the limits of physics. The system
can help mitigate potential vehicle stability incidents,
but cannot prevent them in all cases. Other factors —
such as driving too fast for the road, traffic or weather
conditions, over‑steering, an excessively high vehicle
Center of Gravity (CG), poor road conditions, or
insufficient vehicle maintenance — can cause vehicle
instability that is beyond the capability of any stability
system to mitigate.
WARNING! The TRSP system should only be used
on specific vehicle platforms that have been validated
and approved by BCVS engineering.
WARNING! The TRSP system is not approved for
use on combination vehicles (commonly referred to as
“doubles” or “triples”). The TABS‑6 Adv module shall
not be installed on towing trailers that can be used
for “double” or “triple” trailer applications (including
B‑trains).
WARNING! For vehicles installed with spring
suspension systems, care must be taken to prevent
damage to the load sensor when lifting the trailer. The
linkage rod must be disconnected from the sensor’s
rubber boot whenever the frame of the trailer is lifted,
dropping the axle(s). This includes situations where
a jack is used on the rear bumper or when a crane is
used to lift the trailer.
WARNING! Operating the vehicle with a damaged/
disconnected load sensor could lead to a serious
accident. The Bendix ® Advanced Trailer ABS used on
this vehicle uses sensors, including the load sensor,
to assist the Trailer Roll Stability function.
The TRSP system reduces the risk of roll‑overs during
driving by automatic application of the service brakes when
the system detects potential rollover conditions. This is
accomplished with monitoring sensors both at the trailer
wheel‑ends and within the Bendix ® TABS‑6 ™ Adv module.
The Bendix ® TRSP ® system reacts by applying the trailer
service brakes and slowing the vehicle combination.
The Bendix TRSP system uses the following sensors:
•
Lateral Acceleration: A lateral accelerometer is
located within the Bendix TABS‑6 Adv module. This
sensor detects the lateral motion (or “roll”) of the
vehicle as it moves. The TABS‑6 Adv module may
be mounted either in line with or at right angles to
the main trailer chassis to function correctly — See
Troubleshooting Section for full details of acceptable
installation locations. Note: Do not attempt to change
the location of the module without contacting Bendix
for engineering approval.
• Vehicle Speed: The TRSP system obtains information
about the vehicle speed and rate of acceleration from
the wheel speed sensors.
• Axle/Bogie Load: The trailer’s axle load information
is obtained either by the use of:
(a) An integrated pressure sensor port (P42) of the
TABS‑6 Adv module, where a direct reading of the
suspension air spring pressure is taken; or
(b) If configured for a mechanical spring deflection
sensor, a voltage reading that is proportional to the
spring deflection.
TRSP Intervention with Driver Actions
It is quite possible that the driver will also apply the brakes
before or during a TRSP intervention by the TABS‑6 Adv
module. In all cases, the Electronic Control Unit (ECU)
monitors the driver’s brake application and compares that
to the amount of braking the TRSP program has calculated
needs to be applied. The pressure delivered to the brakes
will always be the higher of the two values.