Double-channel oil feeding type electronic control oil injector with carved grooves

Abstract

The invention aims at providing a double-channel oil feeding type electronic control oil injector with carved grooves. The electronic control oil injector comprises an oil injector head, an oil injector body, a flow-limiting valve assembly, a solenoid valve assembly, a needle valve seat, a needle valve body and a nozzle. A pressure storage cavity is formed in the oil injector body and communicates with a main oil feed hole and the flow-limiting valve assembly, and stability of the oil injection process of all cylinders under a large oil-injection quantity condition is guaranteed. The solenoid valve assembly is machined at the bottom of the oil injector body, a valve rod is driven by electromagnetic force to move, and a flexible oil injection strategy and the oil injection process which is quick in response and high in control precision can be achieved. A two-position three-way valve mode is adopted by a solenoid valve, and by means of double-channel oil feeding inside the oil injector, it is guaranteed that the pressure buildup speed of a control cavity is increased, seat reaching response of a needle valve is increased, and meanwhile dynamic oil return quantity is not increased. The carved grooves with micron-grade depths are formed in the surface of the needle valve body, stability of cavitation flow can be effectively improved, and the cavitation degree of the oil injector is reduced. A static pressure difference does not exist in the oil injector, and it is guaranteed that the oil injector has the advantage of being free of static leakage.

Description

technical field [0001] The invention relates to an engine fuel injection device. Background technique [0002] Due to the current increasingly stringent emission regulations, high-speed solenoid valve injectors are widely used in the market. The prominent feature of this electronically controlled fuel injector is that it realizes complex fuel injection rules with the help of a microcontroller. The fuel injector with high-speed solenoid valve has fast system response, high control precision, flexible control strategy and reliable working performance. But this kind of electronically controlled fuel injector also has disadvantages: the fuel injector usually adopts the form of single-way oil inlet, and the response speed of the needle valve seating is slow. The characteristics are relatively difficult; the dynamic oil return in the form of a two-position two-way valve is large, which affects fuel utilization; controlling the axial gap between the plunger couple and the needle ...

AI Technical Summary

Problems solved by technology

But this kind of electronically controlled fuel injector also has disadvantages: the fuel injector usually adopts the form of single-way oil inlet, and the response speed of the needle valve seating is slow. The characteristics are relatively difficult; the dynamic oil return in the form of a two-position two-way valve is large, which affects fuel utilization; controlling the axial gap between the plunger couple and the needle valve couple causes the injector to have the problem of static leakage of fuel ;When the injector injects a large amount of fuel, the oil pressure in the high-pressure common rail tends to fluctuate violently, resulting in the unevenness of the fuel injection of each cylinder; The degree of cavitation and cavitation is obviously enhanced, and the reliability of the injector is reduced

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