At present, there are three main types of engines that can meet the Euro III emission standards on the market. One is electronically controlled engine, one is electronically controlled unit pump engine, and the other is electronically controlled high-pressure common rail engine. In order for everyone to be able to understand the technical structure and performance of these three engines, the advantages and disadvantages of the three engines are summarized here for reference only. EGR technical characteristics: Its fuel injection system is similar in structure to the Euro Ⅱ mechanical injection pump. The fault diagnosis system has complete functions, easy operation, greatly reduced operating costs, and good fuel adaptability. At present, it can be applied to general-purpose diesel in the country, which is suitable for national conditions. EGR engine repair and maintenance are convenient, reduce the waiting time for repairs, and lower repair costs. Disadvantages: the emission standard...