单缸汽油发动机电控系统设计

针对传统发动机使用的化油器反应滞后、控制不精确、排放污染大的问题，以某款单缸化油器式汽油发动机为研究对象，设计了基于MC9S12XS128单片机的电子控制系统。文中分析了单片机对A/D转化信号的采集要求，设计了各个传感器的信号处理电路及驱动电路。通过对发动机工作过程的分析，对整个控制程序进行了模块化设计，并对主要模块的控制算法进行了阐述。实验结果表明，该系统使得发动机的动力性得到了提高，最大功率约提高了6.62%，同时提高了经济性，燃油消耗量（每小时油耗）降低了5.26%，验证了电控系统的有效性。

A Design and Match of A Electronic Control System for A Single Cylinder

To solve the problem of traditional engine carburetor for delayed response, inaccurate control and large exhaust emissions,Using a gasoline engine as the research object, designing a electronic control system based on the MC9S12XS128 single chip microcomputer. This paper analyzed the acquisition requirements of A/D conversion signal，designed the signal processing circuit and driving circuit of each sensor. Based on the analysis of the working process of the engine, the whole control program is designed, and the control algorithm of the main modules is described. Experimental results show that, the system makes the engine dynamic performance improved, maximum power increased by 6.62%, at the same time the fuel economy improved, fuel consumption (fuel consumption per hour) decreased by 5.26%，the effectiveness of the electronic control system is verified.