Working principle of common rail system
The common rail system is currently the most widely used fuel supply system in diesel engines. Its working principle is to pass fuel through a high-pressure pump, raising the fuel pressure to a very high level, and then sending the fuel into a pipeline called the common rail. In this pipeline, the pressure of the fuel is maintained at a relatively constant level, which ensures that the flow rate and pressure of the fuel are stable during injection from the fuel injector, thereby achieving better combustion efficiency.
Fuel pressure control method
The fuel pressure inside the common rail is regulated by the electronic control unit by controlling the displacement of the high-pressure pump and the opening and closing time of the fuel injectors. Controlling the displacement of the high-pressure pump can be achieved by controlling the speed of the high-pressure pump, and it can be dynamically adjusted according to the working conditions of the engine. At the same time, the electronic control unit can adjust the fuel injection quantity and injection time by controlling the opening and closing time of the fuel injector, thereby achieving control of the fuel injection pressure.
