What is the working principle of the electronically controlled unit pump? Thank you?

Working principle of the composition of the single pump: the single pump consists of a plunger sleeve, a plunger, a spring seat, a return spring, an oil outlet valve, an oil outlet valve spring, an oil outlet valve seat, and an oil outlet valve compression nut.

and other parts.

A unit pump is a device used to generate the injection pressure of an injector (or injector). For the engine using the single pump electronically controlled fuel injection system, there are several cylinders, there are several single pumps, the single pump is the second generation of electronically controlled fuel injection system, according to the different high-pressure generating devices, the fuel injection system can be divided into distribution pump, in-line pump, pump nozzle and single pump electronic control fuel injection system.

The function of the oil outlet valve: to prevent oil dripping after oil injection, to improve the closing speed: when the oil supply is stopped, the passage between the high-pressure oil pipe and the pump chamber will be cut off as soon as the lower edge of the pressure relief belt of the oil outlet valve enters the conduit.

When the oil outlet valve is completely seated, it drops a distance h, so that the volume of the high-pressure oil pipe is increased, so that the oil pressure drops rapidly by 1MPa 2MPa, and the oil is cut off quickly and simply, which prevents the oil from dripping after spraying due to the fluctuation of oil pressure and "pipe shrinkage and oil rise". The cone of the outlet valve is the axial direction of the valve.

The cone of the valve is sealed, and the cone of the valve slides in the guide hole to play a guiding role. The tail is machined with grooves to form a cross-section to allow fuel to pass through. The cylindrical surface in the middle of the outlet valve is called the pressure reducing belt, which forms a pressure reducing volume between it and the sealing cone.

China 3 is installed on the plane.

Moreover, the theoretical design principle of the single pump can cause a gradually flat to gradually rising injection pressure curve, which is the ideal curve of the engine. At the same time, common rail-like production properties are used on the individual pumps to optimize the performance of the entire system. In terms of oil supply control, if a two-valve system is used, not only the pressure can be controlled, but also the injection can be controlled, and multiple injections can be used.

Its standard can reach Euro or Euro capacity. At present, Delphi's dual-valve system is mass-produced in Europe, and the European engine is doing related development work. Another advantage of the individual pump system is its reliability and longevity, which have been proven in the European and North American markets for more than 10 or even 15 years of practical use and millions of vehicles.

Delphi's single pump system ensures emission levels and fuel consumption levels throughout the engine's life. At present, this very intensified, very reliable performance and service life is still being further improved.