Electric control oil injector with dual-channel oil supply

Abstract

The invention aims to provide an electric control oil injector with dual-channel oil supply. The electric control oil injector comprises an oil injector head, an oil injector body, a flow limiting valve component, an electromagnetic valve component, a nozzle and a needle valve body, wherein a pressure storage cavity is formed in the oil injector body, is communicated with a main oil supply hole and the flow limiting valve component, and is capable of ensuring stability of oil injection process of each cylinder under the condition of high oil injection quantity; the flow limiting valve component is arranged under the pressure storage cavity and is capable of preventing continuous abnormal oil injection; the electromagnetic valve component is processed at the bottom of the oil injector body; a valve rod is driven to move due to electromagnetic force, so that the flexible oil injection strategy and the oil injection process with quick response and high control accuracy can be achieved; the electromagnetic valve adopts a two-position three-way valve; through dual-channel oil supply in the oil injector, the dynamic oil return quantity is not increased while ensuring that the pressure buildup speed of a control cavity is accelerated and the needle valve seating response is improved; the static pressure difference is not generated in the oil injector; and the characteristic of no static leakage of the oil injector can be ensured.

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 seat 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 clearance between the plunger couple and the needle valve couple causes the injector to have the problem of static fuel leakage ; When the injector injects a large amount of oil, the oil pressure in the high-pressure common rail tends to fluctuate violently, resulting in the unevenness of the fuel injection of each cylinder

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