Experimental Study on Lean-Burn Characteristics of Gasoline Engine with Prechamber Ignition
A bench test was conducted on a turbocharged gasoline direct-injection engine with a passive prechamber under dif-ferent operating conditions to investigate its efficiency characteristics,combustion characteristics,fuel economy and emission characteristics.The engine employed a triple-injection strategy to form a lean-burn environment of 1 .3 excess air ratio at 2800 r/min and 2000 r/min.The results showed that,at the same speed,the turbocharged prechamber engine exhibited an increasing trend in effective thermal efficiency and effective mechanical efficiency with increasing load,but a decreasing trend of effective thermal efficiency beyond a certain range.CA10,CA50,CA75,CA90 and the maximum knock index showed an in-creasing trend with increasing load,while the combustion cyclic variation rate was also controlled below 0.35％.The lowest specific fuel consumption was 242.1 g/(kW·h)under the condition of 2800 r/min and light load.The emissions of NOx, HC,and CO were closely related to the engine operating conditions and showed a decreasing trend with increasing load.The particle emissions could be controlled to 0.13 mg/m3 .
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