BENDIX BW2262 Uživatelský manuál stáhnout pdf (Strana 6)

Independent Regulation

The most obvious control concept is independent wheel

control. In this case a single sensor controls a valve that

operates the brakes at one wheel site. Individual control

makes the best trade off between stability and stopping

distance. However, these systems have greater complexity

and higher cost with potentially lower reliability than less

complex systems. In many cases it is necessary to control

a single valve with inputs from two sensors.

Select Low

Select low systems monitor several wheels and controls

them with a single valve. Control is based on the wheel

that is at the lowest speed. Select low systems are very

stable but sacrifice stopping distance on split coefficient

surfaces. Modified select low systems incorporate a delay

before releasing to reduce the bias slightly away from the

low speed wheel.

Select High

Select high systems also monitor several wheels and control

them with a single valve. Control is based on the wheel

which is at the highest speed. Modified select high systems

activate a release before the low speed wheel becomes

severely locked. Select high systems generally have good

stopping distances at the expense of stability. These

systems may also have an increased risk of tire flat spotting.

Select Smart

Select Smart systems operate as select low systems when

there is little difference in traction between wheel control

sites. They operate as select high systems when there is a

significant difference in traction between sites. These

systems offer many of the advantages of individual control

systems while using a simpler design and fewer

components.

Bendix

A-18

™

Trailer ABS Control Strategy

Select Smart is used for the most common applications.

Select low is used on the standard system 4S/2M Axle

Control configuration and is available as an option on the

basic system.

TRAILER ABS CONFIGURATIONS

Application Recommendations

Refer to the chart on page 8 to determine a recommended

ABS installation for your application.

Basic System (2S/1M)

The basic system includes two speed sensors and one

modulator valve for direct control of one axle and indirect

control of an additional axle. Other features of the basic

system include one ECU connector and a single-pin

diagnostic lead.

Standard System (2S/1M, 2S/2M and 4S/2M)

Bendix’s standard systems offer either two or four speed

sensors and up to two modulator valves. Standard systems

can directly control one or two axles and allow full

diagnostics via J1587. The standard system may be

configured in one of four ways to function as follows:

• 2S/1M—This configuration uses two sensors and one

modulator valve to directly control one axle and indirectly

control an additional axle.

• 2S/2M—This configuration uses two speed sensors and

two modulator valves for direct control of one axle and

indirect control of up to three additional axles.

• 4S/2M—This configuration uses four speed sensors

and two modulator valves for direct control of two axles

and indirect control of up to two additional axles.

• 4S/2M Axle Control—Special configuration for full

trailers and widely spaced axles. This configuration

uses the select low strategy.

Sensor Placement

When more than one wheel is controlled by a single valve,

sensors should be mounted at the axle which tends to lock

first. For spring suspensions this is usually the forward

axle. For air suspensions this is usually the rear most axle.

Lift Axles

• Gen-4

™

ABS: Sensor inputs “C” and “D” of the control

unit may be used for lift axle wheel speed sensing.

• Gen-5

™

ABS: Direct lift axle control is not available. Use

indirect control.

Reading Configuration Codes

On Basic systems, the jumper method must be used to

access the configuration. On Standard systems, access

to configuration information can be achieved by any of the

three methods:

• ServiceRanger diagnostic software on a PC

• Hand-held tester

• Jumper method.

For more information on accessing configuration codes,

refer to Accessing Codes on page 30.

1 2 3 4 5 6 7 8 9 10 11 ... 39 40

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