CAT: 8612 November 2019
Page 155
OPERATING INSTRUCTIONS
The traction control warning lamp will briefly illuminate and then go out
when the ignition switch is first turned on. The traction control warning
lamp will illuminate whenever the ATC system detects drive wheel spin.
The lamp will remain illuminated as long as wheel spin is detected and the
ATC system is applying the drive wheel brakes or reducing engine torque.
Do not allow the traction control lamp to remain on continuously for
an extended length of time. Extended, continuous use of the ATC can
cause overheating of the drive wheel brakes. Engine torque or vehicle
speed should be reduced to eliminate wheel spin and prevent excessive
application of the ATC system.
ATC is used for slip control of the driving wheels. Under acceleration,
one or more of the driving wheels may start to spin as the drive torque
exceeds the drive tyre to road surface adhesion. ABS responds to braking
by inhibiting wheel lock, ATC reacts to acceleration by holding acceleration
slip within acceptable levels to prevent wheel spin.
The ATC system communicates with the engine ECU via the J1939 data
bus. In the event of a wheel slip incident both engine and ATC systems
operate simultaneously to reduce engine torque/RPM and apply or release
pressure in the service brake system to prevent wheel slip or spin.
The ATC system sensitivity can be reduced by enabling the ATC Off Road
switch.
If the ATC Off Road switch is enabled, the ATC sensitivity threshold will be
decreased up to a speed of approximately 50km/h, at which normal ATC
operation will automatically resume.
Optional features of the Electronic Brake Safety System are outlined below,
and a more comprehensive section is located on the USB memory stick
in the Driver's Information Pack.
DRAG TORQUE CONTROL (DTC)
Premium EC-80 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.
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