Experimental study on pre-ignition characteristics of an E22 ethanol gasoline engine and its optimization
ZHANG Zonglan
CHEN Hong
LAI Kaicang
LI Yuhuai
ZAN Lei
LI Yunlong
Abstract：An ethanol gasoline(E22)with a volume fraction of 22％ethanol is prepared for a 1.5-liter turbocharged and port fuel injection engine.The pre-ignition characteristics of the E22 engine are studied through experiments.And the effects of low calcium engine oil,injector optimization,and excess air coefficient on the pre-ignition characteristics of the E22 engine are further analyzed.The results show that under low-speed and high load conditions,the pre-ignition frequency of the E22 ethanol gasoline is 1-3 times that of pure gasoline(E0).The use of low calcium engine oil can reduce the frequency of pre-ignition.When the torque is 240 N·m,the pre-ignition frequency of the E22 engine is reduced by 65％compared to conventional engine oil.Increasing the number of fuel injector holes from 4 to 8 and shifting the injection,the pre-ignition frequency of the E22 engine is decreased by 61％compared to before optimization when the torque is 240 N·m.Reducing the excess air coefficient can gradually decrease the frequency of pre-ignition.By using low calcium engine oil combined with optimized fuel injection,the pre-ignition frequency of the E22 engine is significantly reduced,and it passed the pre-ignition test standard.The engine produces a peak torgue of 240 N·m within the speed range of 1 750-4 000 r/min,and achieves a maximum power of 120 kW at 5 500 r/min.
Keywords：E22pre-ignitionlow-calcium engine oilinjector optimizationexcess air ratio
Publication Date：2025-11-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：5( 54-57,64 )