Detroit Diesel MBE 900 Technician Manual page 24

COMPONENTS
The parameters sensed by the DDEC-ECU are as follows:
Turbocharger Speed
EGR Temperature after EGR-Cooler
Charge Air Supply Temperature
Intake Manifold Pressure
Intake Manifold Air Temperature
Fuel Temperature
Oil Temperature
Oil Pressure
Coolant Temperature
Crankshaft Position
Camshaft Position
Barometric Pressure
Modulated EGR Valve Functionality
The controlled functions are as follows:
Fuel Injection Duration
Fuel Injection Timing — Beginning Of Injection (BOI)
Modulated EGR Valve Position (downstream from EGR Cooler)
EGR Shutoff Valve Position (Upstream of EGR Cooler)
Idle Speed Boost Pressure (with Actuation of Optional Engine Brake)
The DDEC-ECU is one of two electronic controllers that make up the "Integrated Electronic
System" (IES) that is used in commercial vehicles with the MBE 4000 engine. The separation of
functions of each controller is such that the DDEC Vehicle Control Unit (DDEC-VCU) senses
and controls the vehicle-influencing parameters such as cruise control, while the DDEC-ECU
covers engine operating parameters as described above. The DDEC-ECU is positioned on the left
side of the engine and is cooled by means of fuel.
The various sensed parameters and control logic programmed into the DDEC-ECU determines
which mode of engine operation will apply. These running engine-operating modes include:
Engine Speed Controlled Mode (Including Idle Mode)
Torque Controlled Mode
Emergency Mode
The MBE 4000 engines for NAFTA On-Highway 2004 applications use a liquid-cooled EGR
system. Exhaust from the front three cylinders is routed through the EGR system.
2-8
All information subject to change without notice. (Rev. 5/05)
7SE940 0505 Copyright © 2005 DETROIT DIESEL CORPORATION
PRELIMINARY