Exhaust Gas Recirculation System - Detroit Diesel MBE 900 Technician Manual

COMPONENTS PRELIMINARY
2.2.2

EXHAUST GAS RECIRCULATION SYSTEM

In general, the EGR rate of flow is modulated by the engine control system to optimize NOx and
particulate levels in balance with the air fuel ratio using parameters from the various engine
sensors.
The MBE 900 EGR system utilizes a combination of two EGR valves to control the exhaust gas
flow. The first valve is a rotary plate valve located in the end cover of the EGR cooler. This
valve is electro-magnetically actuated to control EGR flow. The actuator angle is determined
by a DDEC-ECU-controlled PWM signal. See Figure 2-16.
Figure 2-16 MBE 900 EGR Control Valve
2-22
All information subject to change without notice. (Rev. 5/05)
7SE940 0505 Copyright © 2005 DETROIT DIESEL CORPORATION