Abstract
In the past several years, the global diesel engine technology has made significant breakthroughs. The diesel engine has a good economy and power. In 20 years or so, the number of diesel vehicles will exceed the trend of gasoline engines. Diesel engine technology is also developing towards low pollution, low fuel consumption, and high power. To improve the performance of diesel engines, the key is to improve the conversion rate of internal energy to mechanical energy and combustion degrees. In the fuel injection system of diesel engines, a high-pressure common-rail with a large volume is often added between the plunger high-pressure fuel pump and the injector. Its function is to save fuel from the plunger fuel pump, to suppress the fluctuation of oil pressure, and to output high-pressure fuel by adjusting the characteristic parameters of the injector. Firstly, the physical model and mathematical model have been established, including the plunger pump, the high-pressure common rail, and the injector. After that, we use the modified Euler method to solve ordinary differential equations by MATLAB programming. Finally, the Optimized working strategies of plunger pump to inject diesel oil into high-pressure common rail have been obtained. In this high-pressure common rail system, cam of the plunger pump spin 1225.67 times a minute, and pressure relief valve is opened automatically when the pressure in high-pressure common-rail is over 103 MPa, so that the pressure in high-pressure common-rail is approximately stable at 100 MPa, and the fluctuation is small.
Highlights
In the past several years, the global diesel engine technology has made significant breakthroughs [1, 2]
The high-pressure common-rail electronic fuel injection system is similar to other electronic control systems [6], including sensors, electronic control units (ECU) and actuators
It can be seen from the image that the pressure relief valve successfully controls the pressure in the high-pressure tubing below 103 MPa, and makes the pressure in the high-pressure tubing more stable
Summary
In the past several years, the global diesel engine technology has made significant breakthroughs [1, 2]. High-pressure conventional rail technology is the most direct and easy to achieve this requirement. It cooperates with high precision injectors, American Journal of Mechanical and Industrial Engineering 2019; 4(3): 45-51 ensuring the accuracy of injection time and meeting the needs of diesel engines, which shows many advantages in all aspects. Reducing pressure fluctuation in conventional rail tube is the main direction of diesel engine technology research at home and abroad. The high-pressure common-rail electronic fuel injection system is similar to other electronic control systems [6], including sensors, electronic control units (ECU) and actuators. When the plunger moves to the bottom dead point, the low-pressure fuel will fill the plunger chamber (including residual volume), and the pressure of the low-pressure fuel will be 0.5 MPa
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