The high-pressure common rail pipe of a common rail electronic fuel injection diesel engine can be regarded as the "heart" of the entire fuel injection system. It shoulders the key mission of ensuring stable fuel injection pressure and is of great significance for the efficient and stable operation of diesel engines.

Structurally, the high-pressure common rail pipe is a thick and pressure resistant tubular component that connects the high-pressure oil pump with various fuel injectors. Its internal space has been carefully designed to have a certain volume, which plays a fundamental role in maintaining pressure stability. When the high-pressure fuel pump continuously pumps fuel into the common rail pipe, due to the space inside the pipe, the fuel will not immediately flow into the injectors, but will first be stored in the pipe and establish pressure.

At the working principle level, the high-pressure common rail pipe works in conjunction with the high-pressure oil pump and injector. The high-pressure fuel pump continuously pumps fuel to the common rail pipe, causing the pressure inside the pipe to continuously rise. The fuel injector starts fuel injection according to the instructions issued by the electronic control system, and the fuel flows out of the common rail pipe into the cylinder. In this dynamic process, the key to ensuring stable fuel injection pressure lies in the pressure regulation mechanism.

The common rail is equipped with important pressure sensors that constantly monitor the fuel pressure inside the pipe and provide real-time feedback of the pressure signal to the electronic control unit (ECU). Once the pressure sensor detects that the pressure inside the common rail deviates from the preset value, the ECU will quickly respond. If the pressure is too high, the ECU will control the pressure relief valve to open, allowing some fuel to flow back to the tank, thereby reducing the pressure inside the common rail and returning it to a stable range. On the contrary, when the pressure is too low, the ECU will adjust the working state of the high-pressure fuel pump, increase the fuel pumping amount, and increase the pressure inside the common rail.

In addition, the material and manufacturing process of high-pressure common rail pipes also provide guarantees for pressure stability. It uses high-strength and high-pressure resistant special steel to ensure that it will not deform or be damaged when subjected to extremely high fuel pressure, maintain internal space stability, and avoid pressure fluctuations caused by structural changes. At the same time, the precise manufacturing process ensures a smooth interior of the common rail tube, reducing resistance and turbulence during fuel flow, allowing fuel to flow smoothly inside the tube and contributing to even pressure distribution.

In summary, the high-pressure common rail pipe of the common rail electronic fuel injection diesel engine ensures stable injection pressure in all aspects through reasonable structural design, precise pressure feedback adjustment mechanism, and excellent materials and manufacturing processes, laying a solid foundation for precise injection and efficient combustion of the diesel engine, thereby improving the overall performance of the diesel engine.