Electronically controlled fuel injection valve

Abstract

The present invention relates to an electronically controlled fuel injection valve, and unlike a conventional mechanical fuel injection valve, the electronically controlled fuel injection valve provided by the present invention controls the injection time and the injection amount according to a control signal, independent of driving conditions of an engine, enables swift control of the fuel injection by using as a method for controlling the fuel injection a method that increases the strength of lifting up a cut-off needle of an injection control unit by delivering through a control needle high pressure fuel to a lower pressure chamber, and when the fuel injection is not carried out, fuel is not supplied to a nozzle unit, thereby preventing the high pressure from being applied to the nozzle unit at normal times, and prevents a large amount of fuel from being leaked into a combustion chamber when a component such as the needle is damaged, and processing thereof is easy due to the simple structure of a second fluid channel.

Description

technical field [0001] The present invention relates to an electronically controlled fuel injection valve, and more particularly to an electronically controlled fuel injection valve that enables the timing and amount of fuel injection to be controlled according to a control signal independently of the operating conditions of the engine. High pressure is always applied to the electronically controlled fuel injection valve in the nozzle section. Background technique [0002] With the development of electronic control technology, electronically controlled engines are rapidly spreading. Under this trend, the common rail fuel injection method that can be injected under low load and is easy to control injection according to the control signal is used in electronically controlled engines. mainly applied. [0003] A large amount of research and development has been carried out on the electronically controlled fuel injection valve as the core device of the common rail fuel injection...

AI Technical Summary

Problems solved by technology

[0004] Conventional mechanical fuel injection valves have a structure in which the needle is lifted only by the pressure of the fuel injected into the cavity of the nozzle to inject fuel, and the injection characteristics such as the injection timing and injection amount of the fuel are always fixed, so there is a problem that it cannot The problem of achieving fuel injection control independent of engine operating conditions

[0005] In addition, with conventional electronically controlled fuel injection valves, the fuel supplied to the nozzle portion through the fuel supply port is always supplied to the nozzle portion, so high pressure is always applied to the nozzle portion. When problems such as damage to the nozzle needle or valve plate occur , there is a problem of a large amount of fuel leaking into the combustion chamber

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