Series 60 EGR

Section 3.1 Boost Mode

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
Click to see this graphic in a separate window

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.‪

Click to see this graphic in a separate window

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

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