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How many numbers of engine variables are individually controlled in a common rail fuel injection system?

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in Automotive Engine Design by (137k points)
How many numbers of engine variables are individually controlled in a common rail fuel injection system?

(a) 1

(b) 5

(c) 7

(d) 3

I got this question in semester exam.

This is a very interesting question from Modern Common Rail Fuel Injection System in division Diesel Engine Fuel Supply System of Automotive Engine Design

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Best answer
The correct option is (d) 3

Best explanation: The combustion behavior in diesel engines is affected by three variables,which are the timing of injection start, duration of injection, and discharge curve which all are individually controlled in a common rain fuel injection system.

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