Section 3.1
Boost Mode
During boost mode the following occurs (see Figure "Boost Mode EGR Valve Closed" ):
- EGR valve closed
- No EGR flowing through the EGR cooler or delivery pipe
- VNT vane position controlled by intake manifold boost pressure and limited by the turbocharger speed
|
Red = Exhaust Gas |
Yellow= Vehicle Air (VPODs) |
|
Blue= No EGR Flow |
|
Figure 1. Boost Mode EGR Valve Closed
The VNT vane position is adjusted by the VNT actuator air pressure which is regulated by the VPOD. The VPOD determines the correct air pressure via voltage signal from the DDEC V ECM.
Air pressure supplied by the EGR VPOD to the EGR actuator opens the butterfly valve. See Figure "EGR Mode" .
Once the EGR butterfly valve opens, the EGR gases flow through the EGR cooler and into the delivery pipe.
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Red = Exhaust Gas |
Yellow= Vehicle Air (VPODs) |
|
Orange= Cooled Exhaust Gas |
Green= Coolant Flow |
Figure 2. EGR Mode
| Series 60 EGR Technician's Manual - 7SE60 |
| Generated on 10-13-2008 |