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During which condition of the vehicle does NOx emission in SI engine will be lowest?

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in Automobile Engineering by (80.5k points)
During which condition of the vehicle does NOx emission in SI engine will be lowest?

(a) Cruising

(b) Idling

(c) Accelerating

(d) Decelerating

This question was posed to me in an interview for job.

My question comes from Engine Emissions in chapter Emission Control Methods, Electric & Conventional Vehicles of Automobile Engineering

1 Answer

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Best answer
Correct option is (b) Idling

For explanation: NOx emissions are lowest in SI engine during idling. NOx is created from nitrogen in the air. Nitrogen can also be found in fuel blends.

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