Combustion and Emission Characteristics of CNG Engine at Idle Conditons

Abstract:

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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 θi is changed from 40 to 10o 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 θi. The COVimep will be increased if the θi is too advanced or too small. When λ is more than 1.3, the COVimep increases obviously. When λ=1.1, NOx emissions get the highest level.

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Periodical:

Edited by:

Han Zhao

Pages:

786-789

DOI:

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

Citation:

Y. T. He and N. An, "Combustion and Emission Characteristics of CNG Engine at Idle Conditons", Applied Mechanics and Materials, Vols. 130-134, pp. 786-789, 2012

Online since:

October 2011

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$35.00

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