Dual valve electronically controlled fuel injector

Abstract

The invention aims to provide a double-valve electronic control fuel injector. The double-valve electronic control fuel injector comprises a fuel injector head, a boosting control valve, a boosting piston, a fuel injection control valve, a nozzle and a fuel injector body. Double solenoid valves are adopted to correspondingly control the boosting process and the fuel injection process to make the fuel injection process of the double-valve electronic control injector not restricted by the boosting process, so the double-valve electronic control injector can work in two modes of non-boosting andboosting; and rail pressure injection is carried out under the non-boosting mode, ultra-high pressure injection is carried out under the boosting mode, and the flexible adjustment of the pressure ratio can be achieved by changing the control strategy of the boosting control valve under the boosting mode, so that the double-valve electronic control fuel injector is higher in reliability and wider in application range. The fuel injection control valve can enable the double-valve electronic control injector to realize micro-dynamic fuel return, the fuel return amount is greatly reduced, the response speed of a needle valve is increased, and the power performance and economy of a diesel engine are effectively improved.

Description

technical field [0001] The invention relates to a diesel engine, in particular to a diesel engine fuel system. Background technique [0002] Diesel engine is the model with the highest thermal efficiency and the best energy utilization rate among all kinds of power machinery currently being industrialized. Diesel engines are widely used in the fields of ship power, power generation, irrigation and vehicle power, especially in ship power and vehicle power. The fuel injection system of a diesel engine is the core part of a diesel engine. With the increasing environmental pollution and stricter emission regulations, the improvement of the fuel injection system of a diesel engine has attracted much attention. [0003] The electronically controlled fuel injector is the core component of the fuel injection system of a diesel engine, which overcomes the problem that the traditional mechanical injector's fuel injection law is restricted by the shape of the cam. pressure effect. T...

AI Technical Summary

Problems solved by technology

The existing pressurized electronically controlled fuel injector can further pressurize the fuel in the common rail pipe, and is favored for its fast response and precise control of the fuel injection quantity. However, the pressurized electronically controlled fuel injector The working mode of the injector is relatively single, especially for the injector controlled by a single solenoid valve. Once the solenoid valve fails, the entire injector will not work normally, which will easily cause adverse consequences. The problem of poor working reliability has become a problem that restricts growth. The key to the wider application of pressure injectors

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