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How are the injectors activated in a modern common rail fuel injection system?

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in Automotive Engine Design by (137k points)
How are the injectors activated in a modern common rail fuel injection system?

(a) Spring

(b) Solenoid valve

(c) Rotor

(d) Motor

I had been asked this question in an international level competition.

Origin of the question is Modern Common Rail Fuel Injection System topic in section Diesel Engine Fuel Supply System of Automotive Engine Design

1 Answer

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Best answer
Correct choice is (b) Solenoid valve

To elaborate: The fuel injectors present in the modern common rail fuel system are activated by the solenoid valve. Solenoid valves and the fuel pump are electronically controlled. Thus, the common rail serves as the high-pressure reservoir independent of the engine speed.

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