Boost Mode Operation; Transition From Boost Mode To Egr Mode - Detroit Diesel Series 60 EGR Technician Manual

OPERATIONAL MODES

BOOST MODE OPERATION

A typical boost mode operation consists of:
Accelerating a vehicle from a stationary position and shifting up through the transmission
gears
Performing engine brake operation
The vehicle must be at or above 6500 ft of altitude
High ambient humidity to prevent condensation of EGR gases in the intake manifold

TRANSITION FROM BOOST MODE TO EGR MODE

The EGR valve is actuated by the ECM. Initiation of EGR requires minimum engine speed and
boost pressure (air flow) in order to transition into EGR mode without an abrupt drop in air/fuel
ratio.
Once minimum RPM and boost levels are attained the ECM sends a signal via PWM #2,
see Figure 3-3, to initiate the valve opening event by providing air pressure to the EGR actuator.
Figure 3-3 Transition from Boost Mode to EGR Mode
3-4
All information subject to change without notice. (Rev. June 2005)
7SE60 0506 Copyright © 2005 DETROIT DIESEL CORPORATION