OTHER FEATURES
BATTERY
CHECK ENGINE
STOP ENGINE
DIAGNOSTIC DATA
LINK (DDL)
FEEDBACK
ELECTRONIC
CONTROL
MODULE
INJECTORS
OUTPUTS
INPUTS
TIMING
REFERENCE
SYNCH
REFERENCE
THROTTLE
POSITION
TURBO-BOOST
PRESSURE
AIR INLET
TEMPERATURE
OIL TEMPERATURE
OIL PRESSURE
COOLANT
TEMPERATURE
COOLANT LEVEL
FUEL TEMPERATURE
COMMAND
PULSE
SHEMATIC DIAGRAM OF DDEC IV SYSTEM 01092
DETROIT DIESEL ELECTRONIC
CONTROL (DDEC) SYSTEM
DDEC is an advanced-technology electronic fuel
injection and control system for Detroit Diesel
engines. As an integral part of the engine, the
DDEC system provides a number of
performance features and driver benefits
including improved fuel economy and
performance, reduced cold smoke and reduced
maintenance and repair costs. These
advantages are obtained by optimizing control of
the critical engine functions which affect fuel
economy, engine reliability and the performance
of the injectors.
Its major components include an Electronic
Control Module (ECM), Electronic Unit Injectors
(EUI), electronic throttle pedal and sensors. The
ECM, which provides central processing and
control of the DDEC system, contains the
following:
A microprocessor that continuously monitors
and analyzes the engine's performance
using sensors during engine operation;
Flash Random Access Memory (FRAM) that
stores ECM runtime software, which
contains engine control instructions;
Electrically Erasable Programmable Read-
Only Memory (EEPROM) that provides
instructions for basic engine control
functions such as rated speed and power,
engine governing, cold start logic and
diagnostics and an engine protection
system.
The Electronic Unit Injectors (EUI) operates on a
principle similar to the mechanical unit injector
system. However, a solenoid operated control
valve performs the injection timing and metering
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