CONFIDENTIAL

Bendix Commercial Vehicle Systems LLC

Elyria, OH 44036

PRODUCT SPECIFICATION - BW-283-PR

SPEC. BW-283-PR

73 SHEETS

SHEET NO. 9

2 General Product Description

2.1 Trailer Antilock Braking System (TABS)

The Bendix

TABS is an electronic system that prevents wheel lock-up during braking to

maintain optimal vehicle steer-ability and stability, as well as minimizing stopping

distance.

The TABS intervenes during braking whenever the available friction between the road

and the tire of a monitored wheel is less than the braking force applied to the wheel

causing the wheel to decelerate (impending wheel lock) quickly.

The system consists of the following components:

• Electronic Control Unit (ECU)

monitors the speed sensor signals and determines

when ABS intervention is required. It then actuates the appropriate pressure

modulator valves to optimize the brake pressure. The ECU continually monitors the

system to detect and warn the driver of any malfunctions. Diagnostic Troubleshooting

Codes (DTC) are stored in the ECU and can be recalled to diagnose a failure.

• Wheel Speed Sensors (WSS)

located at the wheels to sense the instantaneous

movement of individual wheels and to send an electrical signal directly proportional to

the rotational velocity of the sensed wheel to the electronic control unit.

• Modulator Relay Valves (MRV)

located near the brake chambers and are controlled

electrically by the ECU to decrease, hold or allow the full applied brake pressure into

the brake chamber to control the braking torque at the wheels.

• Trailer ABS Warning Lamp

is controlled by the ECU as required to indicate ABS

status. The trailer ABS warning lamp will illuminate when ignition power is applied to

the ECU, and extinguish after a lamp check is performed if there are no ABS faults

present.

2.2 ABS Control Modes

Several ABS control modes can be utilized for monitoring and controlling the individual

wheels of the trailer. The possible modes are:

• Axle Control:

TABS axle control will utilize a single ABS modulator-valve to control

wheels from both sides of a given axle or axles. In the case of an unbalanced

braking surface, axle control will control the high coefficient wheel just under the lock

limit. Temporary periods of wheel lock are permitted on the low coefficient wheel.

Axle control should not be used on fifth wheel dollies or steerable axles. When

braking on even surfaces, an axle-control system will perform similar to a side

control, two-modulator system. Axle control is available in 2S/1M, 2S/2M and 4S/2M

installations.

• Dolly-Axle Control (Select Low):

TABS dolly-axle control will utilize a single ABS

modulator-valve to control wheels from both sides of a given axle or axles. In the

case of an unbalanced braking surface, dolly-axle control will control the low

coefficient wheel just under the lock limit. Optimal vehicle stability is achieved by not

allowing the high coefficient wheel to sustain wheel lock. When braking on even

surfaces, a dolly axle control system will perform similar to side control or axle control

system. Dolly axle control is only available in 2S/1M installations.

DOCUMENTO CONTROLADO DE FORMATO ELECTRÓNICO: Antes de utilizarlo se requiere verificar el nivel de revision o la suficiencia.

CONTROLLED ELECTRONIC MEDIA DOCUMENT: Verification of revision level or adequacy is required prior to use.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 72 73

CONFIDENTIAL 1

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BENDIX A-18 TRAILER ABS Specifiche Pagina 9

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