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An electronically controlled accumulator fuel injector

A fuel injector and pressure accumulating technology, which is applied in the direction of fuel injection device, machine/engine, charging system, etc., can solve the problem of excessive increase of fuel injection rate, unfavorable engine combustion performance matching, and increase of injector body structure size, etc. The problem is to improve the opening power of the needle valve, optimize the fuel injection performance, and reduce the effect of supplementing high-pressure fuel.

Active Publication Date: 2022-03-15
CHINA NORTH ENGINE INST TIANJIN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the volume of the control plunger chamber increases, the structural size of the injector body will increase, and the high-pressure sealing safety of the control plunger chamber also needs to be reconsidered
At the same time, due to the increase in the volume of the control plunger cavity, it is also easy to cause the fuel injection rate to rise too fast at the initial stage of fuel injection, which is not conducive to matching the engine combustion performance.

Method used

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  • An electronically controlled accumulator fuel injector
  • An electronically controlled accumulator fuel injector
  • An electronically controlled accumulator fuel injector

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Embodiment Construction

[0027] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0028] In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and thus should not be construed as limiting the invention. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and should not be understood ...

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Abstract

The invention provides an electronically controlled accumulator fuel injector, which includes a fuel injector body and a control plunger rod. A control valve, an armature assembly, a solenoid valve spring, a solenoid valve and a first A pressing mechanism, the control valve is tightly connected with the injector body through the second pressing mechanism, the control plunger rod is installed inside the injector body, and the needle valve spring is socketed outside the control plunger rod, and the lower end of the injector body Install the fuel injection nozzle assembly, which is provided with an oil inlet passage inside, the control plunger rod and the valve needle of the fuel injection nozzle assembly are integrated, and the needle valve spring presses the valve needle of the fuel injection nozzle assembly against the valve. On the body, the big head of the control plunger rod and the nozzle assembly form a control plunger chamber inside the injector body, and the control plunger chamber communicates with the high-pressure oil inlet passage. The electronically controlled accumulator fuel injector of the present invention controls the pressure of the plunger cavity through the orifice, so as to increase the opening power of the needle valve and reduce the opening resistance of the needle valve, thereby optimizing the fuel injection performance.

Description

technical field [0001] The invention belongs to the technical field of electronically controlled fuel injectors, in particular to an electronically controlled accumulator fuel injector. Background technique [0002] Conventional electronically controlled fuel injectors are divided into structures with accumulator and structures without accumulator. Generally, a control plunger rod is arranged in the pressure accumulation chamber of an injector with a pressure accumulation structure, and the pressure accumulation structure is also called a control plunger chamber. In general design, the control plunger chamber is directly connected with the high-pressure oil inlet passage, and the control plunger chamber is directly connected with the injector assembly. Since the volume of the oil tank of the injector is smaller than the volume of the control plunger cavity, it can be ignored. On the one hand, the control plunger cavity must control the operation of the needle valve, and on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M47/02F02M51/06F02M61/10F02M61/16F02M63/00F02M61/18
CPCF02M47/027F02M51/061F02M61/10F02M61/16F02M63/0017F02M61/18
Inventor 吴小军陈晓欢高怡奚星孙树平顾娇娇李春辉王国莹张冬梅
Owner CHINA NORTH ENGINE INST TIANJIN
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