Dual-channel oil inlet resonance bypass electronically controlled injector

Abstract

The purpose of the present invention is to provide a dual-channel oil inlet resonance bypass type electronically controlled fuel injector, which includes an injector head, an injector body, a restrictor valve assembly, a solenoid valve assembly, a needle valve assembly, and a nozzle. The restrictor valve assembly is located inside the pressure accumulator chamber to ensure the stability of the fuel injection process of each cylinder under the condition of large fuel injection volume. A resonance through hole and a resonance throttle hole are processed at the bottom of the restrictor valve assembly, and the fluctuation of the fuel oil passing through the restrictor valve assembly is reduced by the principle of superposition of waves. A solenoid valve assembly and a needle valve assembly are arranged below. The solenoid valve adopts the form of a two-position three-way valve to reduce the dynamic oil return. A control slider is arranged inside the control chamber and contacts with the middle block, which slows down the fuel injection rate at the initial stage of injection and accelerates the seating response of the needle valve. The control chamber adopts the method of dual-channel oil feeding to further speed up the pressure build-up speed and realize the fast response characteristics of the injector. There is no static pressure difference inside the injector, and there is no static leakage of the injector.

Description

technical field [0001] The invention relates to an engine fuel injection device. Background technique [0002] The high-speed solenoid valve fuel injector realizes the complex fuel injection law with the help of the controller, which has the advantages of fast response, high control precision, flexible control strategy and reliable working performance. However, with the gradual increase of the fuel injection pressure in the current fuel injector, the performance of the fuel injector has also been tested in various aspects: the injector has static leakage without fuel injection; The dynamic oil return is large, which affects the fuel utilization rate; at the beginning of the injection, the fuel injection rate is too large, resulting in an increase in the emission of nitrogen oxides, and at the end of the injection, the control cavity is fed with oil in a single way, and the pressure build-up speed is slow, so that the fuel is not cut off quickly. , causing the emission of pa...

AI Technical Summary

Problems solved by technology

However, with the gradual increase of the fuel injection pressure in the current fuel injector, the performance of the fuel injector is also tested in various aspects: the fuel injector has static leakage when it is not injecting fuel; the form of two-position two-way valve The dynamic oil return volume is large, which affects the fuel utilization rate; at the beginning of the injection, the fuel injection rate is too high, resulting in an increase in the emission of nitrogen oxides, and after the injection, the control chamber enters the oil in a single way, and the pressure build-up speed is slow, so that the fuel cut-off is not rapid , resulting in the rise of particle emissions; needle valve movement and fuel injection will stimulate water shock pressure waves, resulting in fuel pressure changes in each volume chamber; when a large amount of fuel is injected, the fuel injection process of the fuel injector may affect the fluctuation of the common rail pressure , making the stability and uniformity of the fuel injection process of each cylinder decrease

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