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Generator manufacturers analyze the development trend of diesel generator fuel system for you
June 01, 2022
Diesel engine is the heart of diesel generator set, its importance is self-evident, and the heart of diesel engine is fuel injection system, so the technical development trend of fuel injection system can be said to directly affect the development trend of diesel generator set. In this article, generator manufacturer Dingbo Power will introduce the development trend of diesel generator set fuel injection system from the following aspects, so that you can have a more comprehensive understanding of diesel generator set.
Diesel engine is the heart of diesel generator set, its importance is self-evident, and the heart of diesel engine is fuel injection system, so the technical development trend of fuel injection system can be said to directly affect the development trend of diesel generator set. In this article, the generator manufacturer will introduce the development trend of the diesel generator set fuel injection system to you from the following aspects, so that you can have a more comprehensive understanding of the diesel generator set.
1. Technical development of fuel injection system
The first generation: a position-controlled fuel injection system developed and applied in the 1970s, which was mainly improved on in-line pumps and distribution pumps. Based on the traditional mechanical fuel injection system, this fuel injection system uses an electronic control unit to electronically control the position of the accelerator rack (draw rod). The structure of the diesel engine hardly needs to be changed, and the inherent injection characteristics of the traditional injection system cannot be changed, so it is difficult to greatly increase the injection pressure. The disadvantage is that the degree of freedom of control is small and the precision is poor.
The second generation: It is a time-controlled fuel injection system developed and applied in the 1980s, mainly using in-line pumps, distribution pumps, unit pumps, PT pumps, pump nozzles and other fuel delivery pumps. This system can realize both fuel injection quantity control and fuel injection time control, so the degree of freedom of control is greater. However, the injection pressure of this system still depends on the camshaft, and it is difficult to achieve multiple injections, which is not conducive to reducing engine fuel consumption and emissions.
The third generation: for the high pressure common rail developed and applied in the 1990s. The high-pressure common rail technology consists of a high-pressure fuel pump, a common rail cavity, a pressure sensor, an injector and an ECU to form a closed-loop system, which subverts the design principle of the traditional fuel system. The generation of injection pressure and the injection process are completely separated from each other, and the injection quantity, injection timing, injection time and injection pressure can be flexibly controlled.
2. Influence of high fuel injection pressure on diesel engine
The combustion process of diesel engine is closely related to the quality of fuel atomization. The fuel is injected into the cylinder, and the gas flows in the cylinder, which promotes the atomization of the fuel and forms a uniform mixture. By improving the intake system, a high-energy air flow can be formed in the cylinder, so that the fuel moves, atomizes and burns. Has the following characteristics:
1. The higher the fuel injection pressure, the lower the engine fuel consumption and emissions
The higher the fuel injection pressure, the smaller the injected fuel particles, so that the fuel atomization effect is better, and the fuel and air can be fully mixed and burned, thereby reducing the fuel consumption and emission of the diesel engine;
2. The higher the fuel injection pressure, the higher the diesel engine power.
The higher the fuel injection pressure, the higher the average effective pressure in the cylinder of the diesel engine. According to the calculation formula of liter power P/V=(N×BMEP)/(30×t) (where, N-speed rpm; V-displacement; BMEP-in-cylinder average effective pressure MPa; t-engine stroke, 4 stroke =4), we can see that the higher the average effective pressure in the cylinder, the higher the power liter of the diesel engine, which means that the diesel engine is more compact and has a higher energy density.
Through the above analysis, I believe you have also learned that from a technical point of view, the development trend of diesel generator sets, high-pressure common rail is undoubtedly the most advanced fuel injection technology. From the perspective of high pressure common rail, the high pressure common rail with higher fuel injection pressure and the use of piezoelectric injectors has become the development trend of diesel engine sets because it can improve the energy density of diesel engines and reduce diesel engine emissions and fuel consumption.
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