Class 4 (4th Engineer) MEKM 📅 Dec 2023

Exam Question

With respect to Modern 2-Stroke Diesel Engine;

(a) What is Electronically controlled engine? Which all functions of main engine are controlled electronically (8)

(b) Discus how these type of engines are superior to their earlier designs. (6)

Reference Answer

### (a) Electronically Controlled Engine & Functions
An electronically controlled engine, in the context of modern 2-stroke crosshead diesel engines, is one that replaces the conventional, mechanically driven camshaft with a sophisticated electro-hydraulic system governed by microprocessors. This system provides precise, real-time control over critical engine processes, independent of the crankshaft's rotation.
The core of the system consists of an **Engine Control Unit (ECU)**, which acts as the master controller, and individual **Cylinder Control Units (CCUs)** for each cylinder. The ECU interfaces with the ship's control, safety, and alarm systems, processing sensor inputs (e.g., engine speed, crank angle, scavenge air pressure) to determine the optimal operating parameters. It then sends command signals to the respective CCUs.
The primary functions controlled electronically are:

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