SERIES 60 EGR TECHNICIAN'S GUIDE
3
MODES
OPERATIONAL MODES
New terminology has been introduced as a result of the Series 60 EGR engine.
Boost Mode
Boost Mode is when the engine is generating power with
NO EGR
flowing. The EGR valve
position is closed and the vanes in the turbocharger adjust to achieve a desired boost level. Boost
levels are similiar to 'pre-EGR' engines.
Transition from Boost to EGR Mode
Transition from Boost to EGR Mode is when the engine is generating power using boost pressure
and DDEC requests EGR to begin flow.
EGR Mode
EGR Mode occurs when DDEC is flowing EGR at a desired rate to maintain proper engine
operation. The EGR valve position is open and vanes in the turbocharger adjust to achieve the
desired EGR rate. Typically boost levels are higher under this operating mode when compared
to 'pre-EGR' engines.
EGR Control Mode
EGR Control Mode occurs when the DDEC engine sensors are performing normally and all
engine parameters are within calibration limits as determined by the sensor readings. These
readings enable DDEC to accurately control exhaust gas flow.
Transition from EGR to Boost
Transition from EGR to Boost Mode occurs when the engine is generating power while flowing
EGR and DDEC requests to close the EGR valve and generate power based upon boost pressure.
Braking Mode
Braking Mode occurs when the engine is absorbing energy (power) through an internal
engine-braking device. The power for the engine brake is accomplished by activating the desired
number of cylinders and adjusting the vanes in the turbocharger to achieve the desired boost level.
The EGR valve position is closed during brake mode.
All information subject to change without notice.
(Rev. April 2004)
3-1
7SE60 0404
Copyright © 2004 DETROIT DIESEL CORPORATION