Piezoelectric high-pressure common rail electronic control injector

Abstract

The invention in particular discloses a piezoelectric high-pressure common rail electronic control injector, and solves the problems of complex structure and poor injection performance in a conventional high-pressure common rail injector. A piezoelectric crystal-type two-way valve comprises a piezoelectric crystal actuator, a piezoelectric actuator push rod, a valve seat, a valve, a spring and a spring seat; an interface of a fuel inlet hole on an injector body is communicated with a pressure cavity and a fuel passage on a needle valve body through the fuel inlet hole of the injector body, the fuel inlet hole of the valve seat and the fuel inlet hole on the needle valve body; the fuel inlet hole is also communicated with a control cavity through a fuel inlet throttle hole; the control cavity is communicated with a large fuel return hole and the valve through a fuel outlet throttle hole; and the valve is communicated with the interface of the fuel return hole through a small fuel return hole, a return chute on the upper end face of the valve seat, and the fuel return hole on the injection body. The injector comprises eleven components totally, and has the characteristics of simple structure, high sealing performance, capacity of being used in an ultra-high pressure common rail injection system, high response speed, capacity of adjusting fuel injection rate accurately, realization of repeated fuel injection, and capacity of improving the combustion efficiency of a diesel engine and reducing specific fuel consumption and emission pollution.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to an electronically controlled high-pressure common rail fuel injection system for diesel engines, in particular to a piezoelectric high-pressure common rail electronically controlled fuel injector for the electronically controlled high-pressure common rail fuel injection system for diesel engines. technical background [0002] Diesel engine has high thermal efficiency and has become a widely used engine. The pressure, injection time and injection rate of diesel engine fuel injection are important factors affecting the formation of mixture and combustion efficiency. Therefore, the fuel injection system of diesel engine is a key component that affects the fuel consumption rate and emissions of diesel engines. In order to reduce fuel consumption rate and emissions, various countries Since the diesel engine was born in 1892, its fuel injection system has developed ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of complex structure and poor injection performance of existing high-pressure common rail injectors, the present invention provides simple structure, less parts, less high-pressure sealing surfaces, better sealing performance, higher injection pressure, faster response speed, and A Piezoelectric High Pressure Common Rail Electronically Controlled Fuel Injector with Precise Control of Fuel Injection Rate

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