Traditional direct-injection engines and modern electric-injection engines are two types of engines commonly used in the current construction machinery and equipment. Below to analyze the difference between the two types of engines. The diesel direct injection engine is a conventional engine. Its fuel injection to the system depends only on the system pressure of the fuel system when the engine is working under different working conditions. The fuel supply system performs fuel injection on the engine under different working conditions according to the working pressure. In other words, the direct injection engine oil supply depends only on the system pressure, so it will easily lead to the inability to accurately supply the required fuel according to different operating conditions, affecting the normal operation and service life of the engine. Electronic fuel injection diesel engine is a good solution to the shortcomings of the traditional diesel engine using modern computer technology. It uses sensor sensing technology to detect the working conditions of the engine under different working conditions, such as pressure, temperature and air intake. , And so on, and pre-set the most reasonable system working pressure and required fuel under different working conditions in the computer. In this way, the computer can monitor the various data of the engine work in real time under different working conditions. Accurate fuel supply, and make the system's fuel supply is no longer dependent only on the system pressure, but depends on the fuel supply time, that is, the computer to turn on the electrical pulse of the injector according to the engine operating conditions determined by the monitoring data. Achieve the effect of fuel economy, noise reduction, and also extend the service life.
Let us analyze them from their working principles and characteristics. Direct-injection engines use mechanical linkage to control the time and amount of fuel injection. They mainly use high-pressure oil pumps to pressurize the diesel, and then the mechanical atomizers atomize the diesel. The direct injection engine is characterized by the mechanical control of the fuel injector injection time and fuel injection, the injection pressure is small, the atomization effect is poor. EFI engines are divided into single pump type, electronic fuel injector type, and electronically controlled high pressure common rail type. As far as our common diesel engines are concerned, they are mainly based on high pressure common rail technology. The high-pressure common rail technology is formed by a high-pressure oil pump to form a high-pressure energy storage rail, and the solenoid valve on the injector is controlled by a computer ECU. The solenoid valve is controlled according to various sensor signals to adjust the injection time and fuel injection. For the purpose of quantity, even segmented injection can be achieved, so that diesel can achieve the best combustion effect. The EFI engine is controlled by a computer to control the injection time and fuel injection rate of the injector. The injection pressure is large and the atomization effect is obvious.
In general, the difference in throttle opening controls between the two, injector opening is different, maintenance is also different, energy saving and environmental protection are also different.
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