BENDIX MC-30 TRAILER ABS CONTROLLER Technické informace stáhnout pdf (Strana 8)

4. In response to a serial communications request from

a diagnostic tool.

5. During brake torque limiting to avoid overheating of the

brakes.

6. When certain diagnostic trouble code conditions are

detected.

Engine Torque Limiting (ETL) with Smart ATC

™

Traction Control

The EC-60

™

controller uses Engine Torque Limiting to

control drive axle wheel slip. This is communicated to the

engine control module (using J1939), and is available at

all vehicle speeds.

Bendix

Smart ATC

™

Traction Control

The EC-60

™

controller has an additional feature known as

Smart ATC

™

traction control. Smart ATC

™

traction control

monitors the accelerator pedal position (using J1939) to

help provide optimum traction and vehicle stability. By

knowing the driver’s intention and adapting the target

slip of the drive wheels to the driving situation, the Smart

ATC

™

traction control allows higher wheel slip when the

accelerator pedal is applied above a preset level.

The target wheel slip is decreased when driving through a

curve for improved stability.

Disabling ATC Engine Control and Smart ATC

™

Traction

Control

ATC Engine Control and Smart ATC

™

traction control will

be disabled under the following conditions:

1. In response to a serial communications request from

an off-board tool.

2. At power-up until the ECU detects a service brake

application.

3. If the ECU receives a J1939 message indicating that

the vehicle is parked.

4. If the dynamometer test mode is active. This may be

accomplished via an off-board tool or the diagnostic

blink code switch.

5. When certain diagnostic trouble code conditions are

detected.

Optional ATC Off-Road Mode

In some road conditions, the vehicle operator may desire

additional drive wheel slip when ATC is active. The

Premium EC-60

™

controller has an optional control mode

to permit this desired performance.

The vehicle operator can activate the off-road function with

a switch on the dash panel. Alternately, a J1939 message

may be used to place the vehicle in this mode. The ATC

Indicator Lamp will ﬂ ash continually to conﬁ rm that the

off-road ATC function is engaged.

To exit the ATC off-road mode, depress and release the

ATC off-road switch.

Drag Torque Control Functional Overview

Premium EC-60

™

controllers have a feature referred to as

drag torque control which reduces wheel slip on a driven

axle due to driveline inertia. This condition is addressed by

increasing the engine torque to overcome the inertia.

Drag torque control increases vehicle stability on low-

traction road surfaces during down-shifting or retarder

braking.

Dynamometer Test Mode

WARNING: ATC must be disabled prior to conducting any

dynamometer testing. When the Dynamometer Test Mode

is enabled, ATC brake control and engine control along

with drag torque control are turned off. This test mode

is used to avoid torque reduction or torque increase and

brake control activation when the vehicle is operated on a

dynamometer for testing purpose.

The Dynamometer Test Mode may be activated by pressing

and releasing the diagnostic blink code switch ﬁ ve times or

by using a hand-held or PC-based diagnostic tool.

The Dynamometer Test Mode will remain active even if

power to the ECU is removed and re-applied. Press and

release the blink code switch three times, or use a hand-

held or PC-based diagnostic tool to exit the test mode.

Automatic Tire Size Calibration

The ECU requires a precise rolling circumference ratio

between steer axle and drive axle tires in order for ABS

and ATC to perform in an optimal manner. For this reason,

a learning process continuously takes place in which the

precise ratio is calculated. This calculated value is stored

in the ECU memory provided the following conditions are

met:

1. Rolling-circumference ratio is within the permissible

range.

2. Vehicle speed is greater than approximately 12 MPH.

3. No acceleration or deceleration is taking place.

4. There are no active speed sensor diagnostic trouble

codes.

The ECU is provided with a ratio value of 1.00 as a default

setting. If the automatic tire size alignment calculates a

different value, this is used to overwrite the original ﬁ gure

in the memory. This process adapts the ABS and ATC

function to the vehicle.

Acceptable Tire Sizes

The speed calculation for an exciter ring with 100 teeth is

based on a default tire size of 510 revolutions per mile.

This ﬁ gure is based on the actual rolling circumference of

the tires, which varies with tire size, tire wear, tire pressure,

vehicle loading, etc.

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