论文部分内容阅读
为了准确测量发动机气缸压力、分析燃烧过程,开发了一套可同时测量多缸汽油机各缸示功图的高速数据采集系统,最多同时采集16路信号,最大采样频率1MHz.应用本数据采集系统对化油器发动机改造的双燃料发动机进行了测试.每个气缸测量了至少50循环的压力数据,用倒拖最大压力的平均值为评价标准比较了各缸的进气量差异.同时,分别连续测量了各个气缸燃烧汽油和CNG时的燃烧压力.最后,用最大燃烧压力的平均值和变动系数比较了各缸的燃烧变动.实验结果表明,实验用发动机的各缸进气和燃烧状况存在明显差异,而燃用CNG时最大燃烧压力的变动系数小于燃用汽油时的数据.
In order to accurately measure the engine cylinder pressure and analyze the combustion process, a high-speed data acquisition system that can simultaneously measure the power diagrams of each cylinder in a multi-cylinder gasoline engine is developed. Up to 16 signals can be simultaneously collected at a maximum sampling frequency of 1 MHz. Carburetor engine dual fuel engine was tested.Each cylinder measured at least 50 cycles of pressure data, with the maximum pressure of inverted maximum pressure for the evaluation criteria for comparing the difference between the intake of each cylinder.At the same time, respectively, continuous The combustion pressure of each cylinder was measured when burning gasoline and CNG.Finally, the combustion variation of each cylinder was compared with the average of the maximum combustion pressure and the variation coefficient.Experimental results show that there is obvious air intake and combustion condition in each cylinder of the experimental engine Difference, and the coefficient of variation of the maximum combustion pressure when burning CNG is less than that of the gasoline.