增压汽油机在高温环境下早燃实验及控制策略

Experiments and Control Strategies of Pre-ignition of Turbo-charged Gasoline Engines under High Temperature Environment

普通增压汽油机在低速大负荷工况下,更容易产生一种由早燃引起的超级爆震,这种非正常燃烧现象-"超级爆震"对发动机的破坏性极大。在台架上模拟高温环境,通过实验找出增压汽油机在高温下的早燃情况,然后通过实验找出解决汽油增压发动机在高温环境下的超级爆震问题。结果表明当环境温度与进气温度升高后汽油增压机出现早燃的倾向比正常温度下明显要增多,需要综合调整点火提前角,空燃比和降低增压压力才能有效控制汽油机在高温下早燃发生的次数。

Turbocharged gasoline engine is easier to produce Super-knock caused by pre-ignition at low speed and high load conditions,and the abnormal combustion phenomenon is greatly harmful to the engine. High temperature environment is simulated on the bench to trigger pre-ignition of the turbo-charged gasoline engine,and to solve the super-knock problem through the experimental method under the high temperature environment. Results show that,when the ambient and inlet temperatures rose up to a certain degree,the tendency of pre-ignition significantly increased. The comprehensive adjustment of ignition advanced angle and air-fuel ratio,and decreasing of boost pressure can effectively control the frequency of pre-ignition at high temperatures.