BENDIX MC-12 MODULATOR CONTROLLER ASSY Guia de Resolução de Problemas descarregar pdf (Página 40)

More info: visit www.bendix.com 1-800-AIR-BRAKE (1-800-247-2725)

For color schematics of tractors and trucks see the fold-out cover of this handbook.

Advanced ABS

Yaw S tability

Yaw stability counteracts the tendency of a vehicle to

spin about its vertical axis. During operation, if the

friction at the tires is not sufﬁ cient to oppose lateral

(side) forces, one or more of the tires can slide, causing

the truck/tractor to spin. These are referred to as

under-steer or over-steer situations. Generally, shorter

wheelbase vehicles (tractors, for instance) have less

yaw stability, while longer wheelbase vehicles (straight

trucks) have greater natural yaw stability. Factors that

inﬂ uence yaw stability are: wheelbase, suspension,

steering geometry, weight distribution front to rear,

and vehicle tracking.

Stability Systems

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.

Advanced ABS

The ESP

Stability System

The ESP

functionality of the Bendix Advanced ABS

system responds to a wide range of low- to high-

friction surface scenarios including rollover, jackknife

and loss of control. It is the recommended system for

all power vehicles and especially critical for tractors

pulling trailers. In the case of vehicle slide (over-steer

or under-steer situations), the system will remove the

throttle and then brake one or more of the “four corners

of vehicle” (in addition to potentially braking the trailer),

thus applying a counter-force to better align the vehicle

with an appropriate path of travel. For example, in an

over-steer situation, the system applies the “outside”

front brake; while in an under-steer situation, the

“inside” rear brake is applied.

In the case of a potential roll event, the system will

remove the throttle and quickly apply the brakes to

slow the vehicle combination below the threshold.

Driving Scenario:

Driving speed exceeds the

threshold, and the resulting

lateral force causes the vehicle

to slide or jackknife on lower-

friction surfaces.

Action by Bendix Stability

Solutions:

System applies the appropriate

brakes to reduce speed and

properly align the vehicle, thereby

reducing the tendency to slide or

jackknife.

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