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A piezoelectric crystal fuel injector and its injection control method

A technology of piezoelectric crystals and injectors, applied in the field of in-cylinder direct injection systems of aviation piston engines for small unmanned aerial vehicles, can solve the problems of small engine displacement, large system power consumption, and large number of components, and achieve fuel injection pressure High efficiency, low power consumption, precise fuel injection control effect

Active Publication Date: 2017-05-31
北京领动国创科技有限公司
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Problems solved by technology

The above-mentioned injection system structure is no problem when used on a large-displacement engine, but for the unmanned aerial vehicle, especially the micro-unmanned aerial vehicle power system, the engine displacement is very small, and the fuel injection system with the above-mentioned structure has a large number of components. , the connection is complicated, and the system consumes a lot of power, which is basically impossible

Method used

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  • A piezoelectric crystal fuel injector and its injection control method
  • A piezoelectric crystal fuel injector and its injection control method
  • A piezoelectric crystal fuel injector and its injection control method

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] The present invention provides a highly integrated piezoelectric crystal fuel injector, such as figure 1 As shown, it includes housing 1, piezoelectric crystal actuator 2, piston 3, oil inlet reed valve 4, oil outlet one-way ball valve 5, conical spring 6, injection channel 7, reed fixing bolt 8, and sealing ring 9 .

[0032] The upper part of the housing 1 is a high-pressure oil chamber 103, the lower part is a piezoelectric crystal actuator chamber 105, and the low-pressure oil chamber 102; The piezoelectric crystal actuator 2 is at the bottom of the piezoelectric crystal actuator cavity 105 . The piston 3 is aligned with the oil inlet 101, the lower end of the piston 3 is in a vertically coupled state with the piezoelectric crystal actuator 2, and the piezoelectric crystal actuator 2 expands and deforms at the left and right sides of the trigger p...

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Abstract

The invention provides a fuel oil injection system based on piezoelectric crystals and belongs the field of fuel oil injection of a small displacement piston engine, in particular to a small piston aero-engine. The injection system provided by the invention mainly comprises a shell, a piezoelectric crystal actuator, a piston, an oil-in reed valve, a reed bolt, an oil-out one-way ball valve, a conical spring and an oil injection channel. The piezoelectric crystal generates mechanical displacements by deformation, to realize all the functions of oil pumping, pressurizing and injection. Based on the piezoelectric crystal injection system, the invention also discloses a corresponding control regulation algorithm. Precise regulation of oil injection quantity of an engine in a working cycle can be realized by controlling the pulses in full numbers and pulses in incomplete numbers.

Description

technical field [0001] The invention relates to an electronically controlled fuel injection system for a small-displacement piston engine, in particular to an in-cylinder direct injection system for an aviation piston engine for a small unmanned aerial vehicle. Background technique [0002] Now, the typical piston engine electronically controlled fuel injection system is basically divided into gasoline engine electronically controlled fuel injection system and diesel engine electronically controlled fuel injection system according to different fuels. Among them, the gasoline engine electronically controlled fuel injection system is divided into two types, one is a low-pressure intake port injection system, and the other is a high-pressure in-cylinder direct injection system; while the diesel engine electronically controlled fuel injection system is basically a high-pressure cylinder injection system. Internal direct injection system. In fact, whether it is a gasoline engine...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M51/06F02D41/30H02N2/06
Inventor 张奇杜发荣韩树军闵敏丁水汀
Owner 北京领动国创科技有限公司
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