Abstract
The present study aims to evaluate the emission characteristics for gasoline-fueled vehicles at idling condition. Factors influencing the formation of emissions at different operating conditions are examined. The study is focused on the ignition parameters as well as the mixture quality which are the most important factors affecting the engine performance and emission. A wide range of spark plug gap(0.3- 1.9) mm and ignition timing (10- 1900 BTDC)were employed in the present study. The mixture quality at idling is varied along the flammability limit to clarify its effect on the combustion products concentration. The measurements were carried out on a specified vehicle. Both the engine speed and combustion products concentration were recorded simultaneously. The results indicate the importance of adjusting the idling condition to optimize the exhaust products.
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