CN108869135B - Device for measuring vibration of needle valve of engine fuel injector - Google Patents
Device for measuring vibration of needle valve of engine fuel injector Download PDFInfo
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- CN108869135B CN108869135B CN201810585401.6A CN201810585401A CN108869135B CN 108869135 B CN108869135 B CN 108869135B CN 201810585401 A CN201810585401 A CN 201810585401A CN 108869135 B CN108869135 B CN 108869135B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
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- Combustion & Propulsion (AREA)
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- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a device for measuring vibration of a needle valve of an engine fuel injector, which can collect the vibration of the needle valve and has the characteristic of high-speed response. The method comprises the following steps: the device comprises an oil supply unit, an oil injector, a vibration acquisition unit, a vibration analysis unit and a vibration excitation unit; the oil supply unit is used for supplying oil to the oil sprayer, the oil sprayer is connected with the high-pressure common rail through an oil spraying pipeline, and a needle valve of the oil sprayer is provided with a through groove which radially penetrates through the needle valve; the vibrations acquisition unit includes: the piezoelectric ceramic is arranged in the through groove and used for sensing the vibration of the needle valve, and the data acquisition unit is connected with the piezoelectric ceramic and used for acquiring an electric signal output by the piezoelectric ceramic after the needle valve is sensed to vibrate. The data acquisition unit transmits the acquired electric signals to the vibration analysis unit for data analysis and processing so as to obtain vibration parameters of the needle valve. The vibration exciting unit excites the needle valve in a vibration mode through piezoelectric ceramics, so that vibration compensation can be carried out on the needle valve or the needle valve of the oil injector is controlled to vibrate according to a set direction or a set rule.
Description
Technical Field
The invention relates to a measuring device, in particular to a device for measuring vibration of a needle valve of an engine fuel injector, and belongs to the technical field of engine testing and measuring.
Background
The in-cylinder combustion of the diesel engine directly affects a series of indexes such as dynamic property, economical efficiency, emission characteristic and the like, the quality of fuel atomization determines the quality of fuel combustion, and a good atomization effect is the premise of realizing efficient combustion and has very important significance for energy conservation and purification.
At present, most of the research on engine spraying and combustion by researchers has been focused on the outside of the injector (nozzle shape, number of injection holes, aspect ratio of the nozzle, swirl chamber and combustion chamber shape, etc.), and the research on the inside of the injector has been still relatively small. Recent researchers have found that the vibration of the needle valve can affect the spray pattern, resulting in the spray being asymmetric in the air along the axial direction, as shown in fig. 1; in the multi-hole fuel injector, the vibration of the needle valve further causes the fuel injection quantity of each hole to be uneven, and further combustion in an engine cylinder is influenced. In addition, along with the continuous rise of oil injection pressure, the pressure fluctuation in the oil injector is very obvious, and particularly the pressure change with great gradient is generated near the needle valve when the needle valve is opened and closed, so that the needle valve vibrates, and the spraying quality of an engine is greatly influenced.
Because the needle valve is in narrow and small closed environment, the vibration condition is difficult to measure, and the environmental pressure is extremely high, so that the difficult measurement is more difficult.
Disclosure of Invention
In view of this, the present invention provides a device for measuring vibration of a needle valve of an engine fuel injector, which can collect a needle valve vibration signal caused by external factors.
The device for measuring the vibration of the needle valve of the engine fuel injector comprises: the device comprises an oil supply unit, an oil injector, a vibration acquisition unit and a vibration analysis unit;
the oil supply unit is used for supplying oil to the oil injector and comprises a high-pressure oil pump and a high-pressure common rail connected with the high-pressure oil pump through an oil way;
the fuel injector is connected with the high-pressure common rail through a fuel injection pipeline, and a needle valve of the fuel injector is provided with a through groove which radially penetrates through the needle valve;
the vibration collection unit includes: the piezoelectric ceramic is arranged in the through groove and used for sensing the vibration of the needle valve, and the data acquisition unit is connected with the piezoelectric ceramic and used for acquiring an electric signal output by the piezoelectric ceramic after the needle valve is sensed to vibrate;
the data acquisition unit transmits the electric signal of gathering to vibrations analysis unit and carries out data analysis processing to obtain the vibrations parameter of needle valve, the vibrations parameter includes amplitude and frequency.
More than one piece of piezoelectric ceramic is arranged in the through groove along the length direction of the through groove.
The piezoelectric ceramic vibration compensation device further comprises a vibration excitation unit, wherein the vibration excitation unit is used for driving the piezoelectric ceramic to generate vibration so as to perform vibration compensation on the needle valve of the oil injector or control the needle valve of the oil injector to vibrate according to a set direction or rule;
the fuel injection device further comprises an observation unit, and the observation unit acquires images of the oil beam sprayed by the fuel injector (8) by adopting a backlight method so as to obtain a fuel injection image.
Has the advantages that:
(1) the device can collect needle valve vibration caused by external factors, and has high-speed response characteristics, so that the precision is excellent. Through the research on the needle valve vibration, researchers can optimize an engine oil injection system to improve the spraying quality of the engine, and further promote the combustibility, improve the economy and optimize the emission characteristic. The flexible placing strategy of the piezoelectric ceramics enables the device to have more comprehensive application prospect and market.
(2) The device also has the function of exciting the needle valve in a vibration mode, so that the needle valve can be compensated in a vibration mode or the needle valve of the fuel injector is controlled to vibrate according to a set direction or a set rule.
(3) More than two piezoelectric ceramics are arranged, so that vibration signals of different positions of the needle valve can be obtained during passive acquisition; when the vibration excitation is carried out, different step vibration can be generated for driving each piezoelectric ceramic.
Drawings
FIG. 1 is a direct-shot view of the asymmetric phenomenon of spray due to needle valve vibration;
FIG. 2 is a schematic diagram of the structure of the apparatus of the present invention;
FIG. 3 is a schematic view of a needle valve of the apparatus of the present invention;
FIG. 4 is a schematic diagram of the different placement of piezoelectric ceramics in the device of the present invention.
Wherein: 1-high pressure oil pump, 2-high pressure common rail, 3-piezoelectric ceramic, 4-NI data acquisition card, 5-computer, 6-digital piezoelectric ceramic driving power controller, 7-light source, 8-oil injector, 9-high speed camera, 10-needle valve
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
Example 1:
the embodiment provides a device for measuring vibration of a needle valve of an engine fuel injector, which comprises: the device comprises an oil supply unit, an oil injection unit, a vibration acquisition unit, a vibration analysis unit and an observation unit.
As shown in fig. 2, the oil supply unit includes: the high-pressure oil pump 1 and the high-pressure common rail 2 connected with the high-pressure oil pump 1 are used for pressurizing and keeping fuel in the high-pressure common rail 2 and ensuring the stability of the oil injection pressure.
The oil injection unit comprises an oil injector 8 and piezoelectric ceramics 3, wherein the oil injector 8 is connected with the high-pressure common rail 2 through an oil injection pipeline and is used for injecting oil in the high-pressure common rail 2, and a needle valve 10 of the oil injector 8 is provided with a through groove which is as shown in figure 3 and penetrates through the needle valve 10 along the radial direction.
The vibration collection system includes: the piezoelectric ceramic 3 and the NI data acquisition card 4 are connected with the piezoelectric ceramic 3 through a data transmission line, and the piezoelectric ceramic 3 for sensing the vibration of the needle valve is placed in the through groove of the needle valve 10. The piezoelectric ceramic 3 may be placed in one piece of the through groove or two or three or more pieces of piezoelectric ceramic arranged along the length direction of the through groove, as shown in fig. 4. The NI data acquisition card 4 is used for acquiring the vibration of the needle valve sensed by the piezoelectric ceramic 3, and specifically comprises the following steps: the piezoelectric ceramic 3 senses the vibration of the needle valve and converts the vibration signal into an electric signal which is collected by the NI collection card 4.
The vibration analysis unit is a computer 5 connected with the NI data acquisition card 4, and the NI data acquisition card 4 transmits the acquired needle valve vibration data to the computer 5 for data analysis processing so as to obtain vibration parameters such as amplitude, frequency and the like of needle valve vibration.
The observation unit includes: the light source 7 and the high-speed camera 9, and the observation unit perform device check and observation by using a backlight method, that is, the light source 7 and the high-speed camera 9 are respectively arranged at two opposite sides of the oil beam sprayed by the oil sprayer 8, the light source 7 is opposite to the high-speed camera 9, and when the oil beam is sprayed to the light path of the light source 7 and the high-speed camera 9, a refraction phenomenon occurs, so that light rays cannot be captured by the high-speed camera 9, and black color is displayed as a black area in fig. 1.
The working principle of the device is as follows:
the high-pressure fuel generated by the high-pressure oil pump 1 is kept in the high-pressure common rail 2 and is normally sprayed by the oil sprayer 8, the vibration generated during spraying is sensed by the piezoelectric ceramic 3, a vibration signal is converted into an electric signal, the electric signal is collected by the NI data acquisition card and transmitted to the computer 5 for data analysis and processing, so that relevant parameters of needle valve vibration are obtained, and meanwhile, an observation and check system consisting of the light source 7 and the high-speed camera 9 can be used for observing a fuel oil spraying image.
Example 2:
on the basis of the above embodiment 1, a vibration exciting unit is added in the device for driving the piezoelectric ceramic 3 to generate step vibration.
The vibration excitation unit is a digital piezoelectric ceramic driving power controller 6 connected with the piezoelectric ceramics 3, and when more than two piezoelectric ceramics 3 are arranged, the digital piezoelectric ceramic driving power controller 6 can respectively apply vibration excitation to each piezoelectric ceramic 3 so as to drive the piezoelectric ceramics 3 to generate different step vibrations according to different placement strategies. The vibration exciting unit can be used for carrying out vibration compensation on the fuel injector needle valve after obtaining the relevant parameters of vibration of the fuel injector needle valve or controlling the fuel injector needle valve to vibrate according to the set direction or the set rule.
The working principle of the device provided with the vibration exciting unit is as follows:
high-pressure fuel is generated by a high-pressure oil pump 1 and is kept in a high-pressure common rail 2, a piezoelectric ceramic driving power controller 6 drives piezoelectric ceramic 3 to generate vibration, and fuel oil is sprayed by an oil sprayer 8 and then passes through a light source 7 and a high-speed camera 9 to shield a light path to be captured, so that checking and observation can be performed.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A device for measuring vibration of a needle valve of an engine fuel injector is characterized by comprising: the device comprises an oil supply unit, an oil injector, a vibration acquisition unit and a vibration analysis unit;
the oil supply unit is used for supplying oil to the oil injector (8) and comprises a high-pressure oil pump (1) and a high-pressure common rail (2) connected with the high-pressure oil pump (1) through an oil way;
the fuel injector (8) is connected with the high-pressure common rail (2) through a fuel injection pipeline, and a through groove which penetrates through the needle valve (10) along the radial direction is processed on the needle valve (10) of the fuel injector (8);
the vibration collection unit includes: the piezoelectric ceramic (3) is arranged in the through groove and used for sensing vibration of the needle valve (10), and the data acquisition unit is connected with the piezoelectric ceramic (3) and used for acquiring an electric signal output by the piezoelectric ceramic (3) after sensing vibration of the needle valve (10);
the data acquisition unit transmits the acquired electric signals to the vibration analysis unit for data analysis and processing so as to obtain vibration parameters of the needle valve, wherein the vibration parameters comprise amplitude and frequency;
the vibration excitation unit is used for driving the piezoelectric ceramic (3) to generate vibration so as to perform vibration compensation on the needle valve of the oil injector or control the needle valve of the oil injector to vibrate according to a set direction or a set rule;
the fuel injection device further comprises an observation unit, and the observation unit acquires images of the oil beam sprayed by the fuel injector (8) by adopting a backlight method so as to obtain a fuel injection image.
2. The device for measuring the vibration of the needle valve of the engine fuel injector according to claim 1, characterized in that more than one piece of piezoelectric ceramics (3) is arranged in the through groove along the length direction of the through groove.
3. The device for measuring the vibration of the needle valve of the engine oil injector according to claim 1, characterized in that the vibration exciting unit is a digital piezoelectric ceramic driving power controller (6) connected with the piezoelectric ceramic (3).
4. The apparatus for measuring vibration of a needle valve of an engine injector according to claim 1, wherein when the piezoelectric ceramics (3) are provided in two or more pieces, the vibration exciting unit individually applies vibration excitation to each piezoelectric ceramics (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810585401.6A CN108869135B (en) | 2018-06-08 | 2018-06-08 | Device for measuring vibration of needle valve of engine fuel injector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810585401.6A CN108869135B (en) | 2018-06-08 | 2018-06-08 | Device for measuring vibration of needle valve of engine fuel injector |
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| CN108869135A CN108869135A (en) | 2018-11-23 |
| CN108869135B true CN108869135B (en) | 2020-07-24 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19720333A1 (en) * | 1997-05-15 | 1998-11-19 | Bosch Gmbh Robert | Method for measuring fuel which is supplied to fuel injection valves for injection at an internal combustion engine and fuel injection system for carrying out the method |
| KR20120084890A (en) * | 2011-01-21 | 2012-07-31 | (주)대남테크 | Device for common rail injector test |
| CN202851227U (en) * | 2012-09-27 | 2013-04-03 | 北京工业大学 | High-pressure common rail pressure regulating valve characteristic testing device |
| CN203847306U (en) * | 2014-06-09 | 2014-09-24 | 广西玉柴机器股份有限公司 | Fuel injection pump vibration test device |
| CN107580658A (en) * | 2015-05-08 | 2018-01-12 | 德尔福国际业务卢森堡公司 | Fuel injector including sensor |
-
2018
- 2018-06-08 CN CN201810585401.6A patent/CN108869135B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19720333A1 (en) * | 1997-05-15 | 1998-11-19 | Bosch Gmbh Robert | Method for measuring fuel which is supplied to fuel injection valves for injection at an internal combustion engine and fuel injection system for carrying out the method |
| KR20120084890A (en) * | 2011-01-21 | 2012-07-31 | (주)대남테크 | Device for common rail injector test |
| CN202851227U (en) * | 2012-09-27 | 2013-04-03 | 北京工业大学 | High-pressure common rail pressure regulating valve characteristic testing device |
| CN203847306U (en) * | 2014-06-09 | 2014-09-24 | 广西玉柴机器股份有限公司 | Fuel injection pump vibration test device |
| CN107580658A (en) * | 2015-05-08 | 2018-01-12 | 德尔福国际业务卢森堡公司 | Fuel injector including sensor |
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| Publication number | Publication date |
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| CN108869135A (en) | 2018-11-23 |
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