SERIES 60 EGR TECHNICIAN'S GUIDE
Provides EGR transport mechanism in EGR mode
More vane closure increases the EGR flow rate (PWM % is high).
Less vane closure decreases the EGR flow rate (PWM % is low).
Provides enhanced engine brake capability.
The VNT vanes adjust to control the exhaust gas velocity. See Figure 2-7.
Figure 2-7
VNT Vane Position
Vane Position During Engine Operation
PWM 7%
No air pressure to VNT actuator from the VPOD
Minimum exhaust restriction/Minimum EGR flow while operating in EGR Mode
PWM 50%
Regulated air pressure to the VNT actuator from the VPOD
Moderate exhaust restriction
Increased EGR flow while operating in EGR Mode
PWM 90%:
Maximum regulated air pressure to the VNT actuator from the VPOD
Maximum regulated exhaust restriction/Maximum EGR flow while operating in EGR Mode
All information subject to change without notice.
(Rev. April 2004)
2-7
7SE60 0404
Copyright © 2004 DETROIT DIESEL CORPORATION