The common rail electronically controlled fuel injection technology for diesel engines is a brand-new technology that integrates computer control technology, modern sensing and detection technology, and advanced injector structure. It can not only achieve a relatively high injection pressure and control the injection pressure and fuel injection volume, but also realize pre-injection and segmented injection, thereby optimizing the fuel injection characteristics, reducing diesel engine noise, and significantly reducing the emissions of harmful components in exhaust gases.
① By adopting advanced electronic control devices and high-speed electromagnetic on-off valves, the control of the fuel injection process is very convenient, and there are many controllable parameters, which is conducive to the full-process optimization of the diesel engine combustion process.
② With the common rail fuel supply mode, the pressure fluctuation of the fuel injection system is small, the mutual influence between injectors is small, the control accuracy of the injection pressure is relatively high, and the control of the fuel injection volume is relatively accurate.
③ The high-speed electromagnetic on-off valve has a high frequency and flexible control, which enables the fuel injection system to have a wide adjustable range of injection pressure and easily realize functions such as pre-injection. This provides an effective means for optimizing the fuel injection law of diesel engines, improving their performance, and reducing exhaust emissions.
④ The system structure is easy to transplant and has a wide range of adaptability. In particular, it can be well matched with current small, medium, and heavy-duty diesel engines, so it has broad market prospects.
⑤ It can independently and flexibly control the fuel injection timing. Combined with a high injection pressure (120-200 MPa), for the commonly used common rail system of Bosch, the common rail pressure is 145 MPa, which can simultaneously control NOx and particulate matter (PM) within relatively small values to meet emission requirements.
In summary, the common rail electronically controlled fuel injection system helps to reduce the harmful exhaust emissions of diesel engines and has comprehensive performance in reducing noise, reducing fuel consumption, and increasing power output. The high-pressure common rail system is the world's most advanced fuel injection system and is recognized by the world's internal combustion engine industry as one of the three major breakthroughs in the 20th century. It is an ideal fuel injection system for diesel engines to meet the Euro III and Euro IV emission regulations. Common rail technology helps to reduce the exhaust emissions of diesel engines and improve the comprehensive performance in terms of noise and fuel consumption. While being beneficial to environmental protection, it will also promote the development of the diesel engine industry, the automotive industry, and related industries.