Bidirectional integrated opposed valve, high pressure fuel inlet and return linkage control system and control method

Abstract

The invention discloses a bidirectional integrated opposed valve, comprising a valve base, and a valve core with an opposed cone valve, two pressure bearing surfaces and dual guiding segment. A high pressure fuel inlet and return linkage control system comprises a control cavity, an oil inlet cavity, an oil outlet cavity and the bidirectional integrated opposed valve; the upper pressure bearing surface of the bidirectional integrated opposed valve is positioned at the control cavity, a lower cone valve is communicated with the oil inlet cavity, and the lower pressure bearing surface is positioned at the oil inlet cavity; two ways of an oil inlet pipeline respectively lead to the control cavity and the oil inlet cavity; and an oil inlet throat is arranged on the oil inlet pipeline of the control cavity, the control cavity is also connected with an oil drain pipeline, and an oil drain throat and a pilot valve are arranged on the oil drain pipeline and communicated with an oil tank. A high pressure fuel inlet and outlet linkage control method comprises three working states, namely an initial state, an oil outlet state and an oil return state. The system and the method are particularly applicable to the oil path control of high pressure, particularly 160 MPa and above ultrahigh pressure fuel, and the system structure is simple, the frequency response is rapid, the sealing effect is good, and the flow rate is high.

Description

technical field [0001] The invention belongs to the technical field of fluid control. In particular, it relates to an ultra-high pressure fuel inlet and return linkage control system and a control method, which are especially suitable for ultra-high pressure fuel injection systems and also for other high-pressure fluid controls. Background technique [0002] There are many methods for controlling low-pressure fluid (or gas) in the prior art. For example, in the patent No. CN93109383.X "Electro-hydraulic fast and large-flow oil discharge valve", it adopts two split cone valves, and uses an electromagnetic The power on and off of the valve (pilot valve) element makes the executive element directly act on the small cone valve spool to make it move to realize oil discharge, and at the same time, the difference in effective hydraulic pressure force area on the left and right sides of the large cone valve spool makes the large cone valve The spool opens to realize the oil drain f...

AI Technical Summary

Problems solved by technology

In these inventions of electronically controlled fuel injectors, the advantage is that the hydraulic pressure is amplified by using the pilot valve, and the system responds quickly, but these systems all use split valve cores, and can only realize high-pressure fuel when the system is in working condition. When the high-pressure fuel is directly injected into the engine cylinder, the high-pressure fuel cannot be stably output to other systems for use and linkage to realize the system's oil return and pressure relief function

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