BENDIX MC-12 MODULATOR CONTROLLER ASSY Informations techniques télécharger pdf (Page 8)

WARNING: The ABS off-road mode should not be

used on normal, paved road surfaces because vehicle

stability and steerability may be reduced. The ABS

Indicator Lamp will ﬂash slowly to indicate to the driver

that the ABS off-road mode is engaged.

CAUTION: When ABS off-road mode is engaged,

stability functions are disabled at speeds below

approximately 25 mph. The ATC/ESP dash lamp will

illuminate to indicate to the driver that the stability

system is disabled.

The vehicle manufacturer should provide the optional ABS

off-road function only for vehicles that operate on unpaved

surfaces or that are used in off-road applications, and is

responsible for insuring that vehicles equipped with the ABS

off-road function meet all FMVSS-121 requirements and

have adequate operator indicators and instructions.

The vehicle operator activates the off-road function with a

switch on the dash panel. A ﬂashing ABS Indicator Lamp

indicates to the driver that the ABS off-road function is

engaged. To exit the ABS off-road mode, depress and

release the switch. A new ignition cycle will also cause the

ECU to exit the ABS off-road mode.

All-Wheel Drive (AWD) Vehicles

AWD vehicles with an engaged interaxle differential (steer

axle to rear axle)/AWD transfer case may have negative

effects on ABS performance. Optimum ABS performance

is achieved when the lockable differentials are disengaged,

allowing individual wheel control.

Advanced EC-60

™

controllers can be programmed

speciﬁcally for this conﬁguration to control the differential

lock/unlock solenoid in the AWD transfer case. When

programmed to do so, the ECU will disengage the locked

interaxle/AWD transfer case during an ABS event and

reengage it once the ABS event has ended.

ATC OPERATION

ATC Functional Overview

Just as ABS improves vehicle stability during braking,

ATC improves vehicle stability and traction during vehicle

acceleration. The EC-60

™

controller ATC function uses

the same wheel speed information and modulator control

as the ABS function. The EC-60

™

controller detects

excessive drive wheel speed, compares the speed to the

front, nondriven wheels, and reacts to help bring the wheel

spin under control. The controller can be conﬁgured to use

engine torque limiting and/or differential braking to control

wheel spin. For optimal ATC performance, both methods

are recommended.

ATC/ESP Lamp Output/ATC Mud/Snow Switch

Input

Advanced ECUs control the ATC/ESP dash lamp as

follows.

The ATC/ESP dash lamp illuminates:

1. During power up (e.g. when the vehicle is started) for

approximately 2.5 seconds and turns off after the self

test is completed, providing no diagnostic trouble codes

are present.

2. When ESP or ATC is disabled for any reason.

3. During an ESP or ATC event (the lamp will ﬂash rapidly

at a rate of 2.5 per second).

4. When the ECU is placed in the ATC off-road mode

(the lamp will ﬂash steadlily at a rate of once per 2.5

seconds). This notiﬁes the vehicle operator that the

ATC Mud/Snow mode is active.

5. When the ECU is placed in the ABS off-road mode.

When in this mode, ESP will be disabled below 25 mph

and its inactive status will be indicated by a steadily

illuminated ATC/ESP lamp.

Differential Braking

Differential braking within ATC is automatically activated

when drive wheel(s) on one side of the vehicle are spinning

excessively, which typically occurs on road surfaces with

patches of ice. The traction system will then lightly apply the

brake to the drive wheel(s) that are spinning excessively.

The vehicle differential will then drive the wheels on the

other side of the vehicle.

Differential braking (as part of ATC functionality) is available

at vehicle speeds up to 25 MPH.

Disabling ATC Differential Braking

ATC differential braking is disabled under the following

conditions:

1. During power up (e.g. when the vehicle is started), until

the ECU detects a service brake application.

2. If the ECU receives a J1939 message indicating that

the vehicle is parked.

3. When the dynamometer test mode is active. The

dynamometer test mode is entered using the diagnostic

blink code switch or by using a diagnostic tool (such as

Bendix

ACom

™

Diagnostics).

4. In response to a serial communications request from

a diagnostic tool.

5. If ATC Differential Braking function is activated for a long

time period to avoid overheating of the brakes. It would

take approximately 3 continuous minutes of activation

for the timeout to occur. Once timed out, approixmately

2 minutes of "cool off" time would be required before

ATC Differential Braking can be used again.

6. When certain diagnostic trouble code conditions are

detected.

Engine Torque Limiting 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.

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