BENDIX SD-13-47671 Manuel D’Utilisation

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.