Page 352 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

LESSON 114 - 117: Electronic Diesel control- Electronic

Diesel control systems, Common
Rail Diesel Injection (CRDI) system,

hydraulically actuated electronically

controlled unit injector (HEUI) diesel

injection system

Objectives

At the end of this lesson you shall be able to
• explain about electronic diesel control system
• demonstrate about CRDI system
• explain about HEUI.

Electronic diesel control systems, Common Rail Diesel Injection (CRDI) system
Electronic diesel Control (EDC) System
EDC system
Electronic diesel control (Fig 1 to 2) is a diesel engine fuel injection control system for the precise metering and
delivery of fuel into the combustion chamber of modern diesel engines used in trucks and cars.
The electronic control, the system which provides greater ability for precise measuring, data processing
environment flexibility and analysis to ensure efficient diesel engine operation.
• It receives the information from sensor, analyze/ calculate it and sends the instructions to the actuators.
• It converts information from analog to digital.
• It consists of microprocessors to process the information from sensor to ECM and ECM to actuators.
• Number of microprocessors are depending upon the number of sensors and actuators.

• It also consists of memory to store the data.
• Speed is in the form of 8 Bit, 16 Bit, 32 Bit, 64 Bit etc., to pass the information from sensor to ECM, ECM to
actuator and also in networking system.

• Individual programmers have to be made for each sensor and actuator.

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