Q1. Common rail fuel injection systems have made a come back in marine diesel engines, the older mechanically controlled system have been replaced by electronic/hydraulic controlled system. Describe, with a line diagram any one type of a modern CR system, mentioning the engine type.
b) Compare the advantages and disadvantages of the common rail fuel injection system with the jerk type of injection system. Give examples of their use in modern diesel engines.
Q3. With reference to a main engine fuel system of the high-pressure common rail type:
(a) Sketch a common rail fuel injection system from booster pump inlet to cylinder head fuel valves, labelling the MAIN components.
(b) Explain how the fuel pumps are operated and the common rail pressure is maintained;
(c) Explain how fuel injection timing and quantity is regulated for the common rail fuel system sketched in part (a).
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