Combustion and Emission Characteristics of CNG Engine at Idle Conditons

Yi Tuan He; Na An

doi:10.4028/www.scientific.net/AMM.130-134.786

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 130-134Combustion and Emission Characteristics of CNG...

Combustion and Emission Characteristics of CNG Engine at Idle Conditons

Abstract:

The effects of ignition advance angle and excess air ratio on the combustion and emissions characteristics were investigated on a CNG engine at idle conditions. The throttle valve was fully closed. When the parameters were changed, the stepper motor was adjusted automatically to control the engine speed at 800r/min. When the θ_iis changed from 40 to 10^o BTDC, the maximum ITE and the maximum power are observed at λ=1.1. As λ increases, the maximum ITE is corresponding to a greater θ_i. The COV_imep will be increased if the θ_i is too advanced or too small. When λ is more than 1.3, the COV_imep increases obviously. When λ=1.1, NO_x emissions get the highest level.

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Periodical:

Applied Mechanics and Materials (Volumes 130-134)

Pages:

786-789

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.130-134.786

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Online since:

October 2011

Authors:

Yi Tuan He, Na An

Keywords:

CNG Engine, Excess Air Ratio, Idle, Ignition Advance Angle

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