Electronically controlled fuel injection valve

Abstract

An electronically controlled fuel injection valve can independently control the time to inject fuel and the amount of fuel to be injected in response to a control signal sent from the operating condition of an engine unlike a traditional mechanical fuel injection valve, and employs a control method for fuel injection that increases the force of lifting up a cutoff needle of an injection controller by delivering high-pressure fuel to a lower pressure chamber via a control needle, thereby rapidly controlling fuel injection. The electronically controlled fuel injection valve prevents a nozzle part from being constantly subjected to high pressure due to the nozzle part being not supplied with fuel when fuel is not injected, prevents a large amount of fuel from leaking into a combustion chamber when a part such as a needle is damaged, and simplifies the structure of a second flow path, thereby facilitating fabrication.

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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