BENDIX MC-12 MODULATOR CONTROLLER ASSY Guia de Resolução de Problemas descarregar pdf (Página 38)

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

ABS Components continued ...

• Dash-mounted tractor ABS Indicator Lamp

• Service brake relay valve

• Dash-mounted trailer ABS Indicator Lamp (used

on all towing vehicles manufactured after March

1, 2001)

• Optional blink code activation switch

• Optional ABS off-road switch. (Off-road feature

is not typically available on all models)

Some “Premium” Bendix ABS systems utilize

additional components, such as traction control valves,

a dash-mounted ATC status/indicator lamp, serial

communication to the engine control module, a stop

lamp switch input, and optional ATC off-road switch.

With advanced ABS, the roll stability and ESP features

require additional components including vehicle

sensors to detect vehicle motion (lateral and yaw-rate

sensors, and pressure sensors for load estimation)

and driver intention (by monitoring the turning of the

steering wheel).

All Bendix ECUs feature digital electronics with self

test and diagnostic circuitry that continuously monitors

operation of the entire antilock system including wiring

continuity. A history of all diagnostic trouble codes are

stored in the controller’s memory and are not cleared

by loss of power to the unit.

ECU controllers are typically available in frame-

mounted and cab-mounted models.

Bendix Adaptive Cruise & Braking (ACB) also

integrates some advanced ABS components to aid in

collision avoidance: see page 46 for more information.

Truck a nd Tractor ABS

Operation

As described in the introduction to this section, Bendix

ABS uses wheel speed sensors, modulator valves,

and an ECU. By monitoring individual wheel turning

motion during braking, the ECU is able to optimize

slip between the tire and the road surface by pumping

the brakes on individual wheels (or pairs of wheels),

independently.

Steer Axle Control

Although both wheels of the steer axle have their own

wheel speed sensor and pressure modulator valve,

the ECU blends the applied braking force between

the two steering axle brakes. A Bendix patented

brake application control, called Modiﬁ ed Individual

Regulation (MIR), has been designed to help reduce

steering wheel pull during an ABS event on road

surfaces with poor traction (or areas of poor traction,

e.g. asphalt road surfaces with patches of ice).

Vehicle Conﬁ gurations

Depending on the number of drive axles, various

numbers of sensors and modulators may be used for

an ABS system. For example, a 4 sensor/4 modulator

(4S/4M) system would typically be used for a single

drive axle vehicle. System conﬁ gurations are available

for 4S/4M, 6S/6M, and 6S/5M (with the additional

axle, a non-driven rear axle, having two sensors, but

Bendix

EC-30

™

ABS/ATC

Controller

Bendix

EC-60

™

ABS/ATC Controllers

(left: Frame mount, and right: Cab Mount.)

Advanced Bendix

ABS uses yaw and

steering wheel

sensors to monitor

the vehicle motion.

See pages 38 and

39.

Speed

Sensor

Mounting

Block

100 Tooth (typical)

Speed Sensor

Exciter Ring

(“tone” ring)

WS-24

™

Speed

Sensor (90 Deg.)

Hub

Assembly

S-Cam Brake

ABS Components Continued; Truck and Tractor ABS Operation

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 69 70

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