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) How these type of engines are superior to their earlier designs (8)
Class 4 (4th Engineer)
MEKM
📅 May 2023
Reference Answer
### (a) Electronically Controlled Engine & Controlled Functions
An electronically controlled engine, often referred to as a "camshaft-less" engine, is a modern two-stroke marine diesel engine where the primary operational functions, traditionally managed by a mechanical camshaft, are controlled by a sophisticated mechatronic system. This system integrates a computer control network with hydraulic or pneumatic actuators to achieve precise and flexible engine management.
The control architecture is hierarchical and consists of the following key components:
* **Engine Control Unit (ECU):** This is the master controller or the "brain" of the engine. It serves as the primary interface between the engine and the ship's control systems (Bridge, Engine Control Room). As stated in the provided context, the ECU manages the overall engine situation, receiving inputs from numerous sensors (e.g., engine speed, crank angle, scavenge pressure, temperatures) and a Torsional Vibration Analyser. It processes this data to determine the optimal engine settings and sends command signals to the individual Cylinder Control Units.
An electronically controlled engine, often referred to as a "camshaft-less" engine, is a modern two-stroke marine diesel engine where the primary operational functions, traditionally managed by a mechanical camshaft, are controlled by a sophisticated mechatronic system. This system integrates a computer control network with hydraulic or pneumatic actuators to achieve precise and flexible engine management.
The control architecture is hierarchical and consists of the following key components:
* **Engine Control Unit (ECU):** This is the master controller or the "brain" of the engine. It serves as the primary interface between the engine and the ship's control systems (Bridge, Engine Control Room). As stated in the provided context, the ECU manages the overall engine situation, receiving inputs from numerous sensors (e.g., engine speed, crank angle, scavenge pressure, temperatures) and a Torsional Vibration Analyser. It processes this data to determine the optimal engine settings and sends command signals to the individual Cylinder Control Units.
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