New Holland SmartTrax T8.320 Service Manual page 33

Exhaust brake
Admission phase:
Intake of fresh air.
All Cursor® engines are equipped with an advanced
engine brake system: the Iveco Turbo Brake (IBT)
system.
• Decompression engine brake
• Quick responding
• Integrated in the engine control
• Linked to cruise control
• Linked to EBS
Advantage
• Less brake pad wear
• Automatically engaged
Benefit
• Reduced operation cost
• Operator ease
The engine brake is controlled by the Tractor Control Unit
(TCU). The Electronic Service Tool (EST) is used to con-
figure the TCU as to whether or not the tractor has an
engine brake.
Engine - Engine and crankcase
Compression phase:
Energy is stored in the
compressed air, braking
effect increases with
compression
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Top dead center:
Exhaust valves open,
compressed air is released,
energy is blown out.
Exhaust phase:
Cylinder is empty, no energy
exchange. Exhaust gases
impact against the turbine,
creating an additional
braking effect.