24 1 ENGINE SYSTEMS
EGR actuator is located at the front of the engine on
the intake manifold.
EGR Closed Loop System and Control
Figure 16 EGR closed loop operation with fault
management
The EGR drive module controls the EGR actuator and
is located on the left side of the engine on the ECM
and Injector Driver Module (IDM).
The EGR drive module receives the desired EGR
actuator position from the ECM across the CAN
2 d atalink to activate the valve for exhaust gas
recirculation. The EGR drive module provides
feedback to the ECM on the valve position. The
EGR drive module interprets the ECM command
and sends the command using three pulse-width
modulated signals to the valve actuator.
The system is closed loop control using the EGR
position signals.
Figure 17 EGR control
Exhaust System
The exhaust system includes the following:
• Exhaust valves
• Exhaust manifold
• Diamond Logic® engine brake
• Variable Geometry Turbocharger (VGT)
• Exhaust piping
•Muffler and catalytic converter – dependent on
application
• Catalyzed Diesel Particulate Filter (CDPF) –
dependent on application
The exhaust s ystem rem o ves exhaust gases from
the engine. Exhaust gases exit from exhaust valves,
through exhaust ports, and flow into the exhaust
manifold. Expanding exhaust gases are directed
through the exhaust manifold. The exhaust manifold
directs some exha ust gases into th e Exhaust Gas
Recirculation (EGR) cooler. Exhaust gases flowing
into the turbocharger drive the turbine wheel. Exhaust
gases exit the turbocharger and flow into the exhaust
piping, through the muffler and catalytic converter
or CDPF, depending on application, and out the
discharge pipe to the atmosphere.
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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