An Electromagnetically Driven Non-Back Pressure Electronically Controlled Diesel Injector

Abstract

An electromagnetically driven non-backpressure electronically controlled diesel fuel injector, including a fuel injector housing with an oil inlet passage and an oil return passage, a nut sleeve, an electromagnetic driver, a two-position three-way valve without backpressure, a lock nut, Adjusting gasket, transition block, pressure spring, fuel injector coupler, install transition block, non-back pressure two-position three-way valve, adjusting gasket, lock nut, and electromagnetic driver in sequence in the axial direction of the injector housing , install the pressure spring, the injector assembly, the upper and lower end surfaces of the injector housing, the transition block, the two-position three-way valve without back pressure and the two end surfaces of the adjusting gasket, and the lower end surface of the electromagnetic driver in sequence in the nut sleeve. It is a high-flatness plane, and the end faces of each part are closely connected to form a seal, which constitutes a mechanism for the axial movement of the needle of the fuel injection nozzle of the non-backpressure two-position three-way valve controlled by an electromagnetic driver under the high-pressure diesel state; The actuator is free from external interference during the driving process and has good high-frequency response characteristics, which can realize more accurate and higher-frequency high-pressure diesel injection.

Description

technical field [0001] The invention relates to a fuel injector used in an electronically controlled diesel engine fuel injection system, in particular to an electromagnetically driven electronically controlled diesel fuel injector using common rail electronically controlled fuel injection technology. Background technique [0002] At present, the fuel supply system of the common rail electronically controlled diesel engine uses an electromagnetic injector to inject high-pressure diesel into the cylinder. Since the electromagnetic coil of the electromagnetic injector has a certain degree of inductance when it works, it is difficult to respond to the requirements of higher injection frequency. , which restricts the development of diesel engines in the direction of lower fuel consumption, cleaner emissions, and lower noise. Moreover, the two-position three-way valve used in the injector of the electronically controlled injector has a large force due to back pressure. Requires g...

AI Technical Summary

Problems solved by technology

[0002] At present, the fuel supply system of the common rail electronically controlled diesel engine uses an electromagnetic injector to inject high-pressure diesel into the cylinder, because the electromagnetic coil of the electromagnetic injector works There is a certain degree of inductive reactance, which makes it difficult to respond to the requirements of higher injection frequency, which limits the development of diesel engines in the direction of lower fuel consumption, cleaner emissions, and lower noise. Three-way valve, there is a back pressure to generate a large force, which requires a large control force to control

Based on this, in 2008, the inventor applied for a fuel injector used in an electronically controlled diesel engine fuel injection system with good product performance, relatively low processing conditions, low processing difficulty, and low cost. Magnetostrictive element-driven non-backpressure electronically controlled diesel fuel injector, (patent application number 200810073748.9)", after recent research by the applicant, it was found that "a magnetostrictive element-driven non-backpressure electronically controlled diesel fuel injector "Fuel injector" still has shortcomings: it is susceptible to external interference during the fuel injection process, and the high-frequency response characteristics of the fuel injector are not good enough, etc. The performance of the drive unit of the fuel injector of the electronically controlled diesel engine fuel system needs to be improved

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