Abstract
A bench test was conducted on a turbocharged gasoline direct-injection engine with a passive prechamber under different operating conditions to investigate its efficiency characteristics, combustion characteristics, fuel economy and emission characteristics. The engine employed a triple-injection strategy to form a leanburn environment of 1.3 excess air ratio at 2 800 r/min and 2 000 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 increasing 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 2 800 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.
Key words
precombustion chamber /
gasoline engine /
lean burn /
specific fuel consumption /
emission /
injection strategy
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YIN Congbo,SHEN Xiaoyu.
Experimental Study on Lean-Burn Characteristics of Gasoline Engine with Prechamber Ignition[J]. Vehicle Engine. 2024, 0(4): 17-23
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