CN103954624B - Diesel fuel system high pressure fuel cavitation dynamic and visual observation procedure - Google Patents
Diesel fuel system high pressure fuel cavitation dynamic and visual observation procedure Download PDFInfo
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- CN103954624B CN103954624B CN201410162844.6A CN201410162844A CN103954624B CN 103954624 B CN103954624 B CN 103954624B CN 201410162844 A CN201410162844 A CN 201410162844A CN 103954624 B CN103954624 B CN 103954624B
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Abstract
The present invention relates to a kind of dynamic and visual observation procedure of diesel fuel system high pressure fuel cavitation, belong to Diesel Engine Technique Field.The inventive method is by building pilot system, design optics cone valve, the opening and closing of electronically controlled unit pump and electric-controlled fuel injector are controlled by single-chip computer control system, with the high-speed camera being installed on optics cone valve observation end, the cavitation phenomenon occurring in optics cone valve circular cone end is taken pictures, finally carry out image procossing, calculate the change procedure of the cavitation phenomenon of high pressure fuel under the pressure difference value and parameter index of step 2 at optics cone valve inner conical face place; Achieve dynamic and visual to observe, fuel system fuel feeding and oil-break moment under different operating modes, the change procedure of the cavitation phenomenon that sealing circular cone end produces; By the analysis of variance procedure result of cavitation phenomenon, can better explain the reason producing diesel fuel system pressure surge.
Description
Technical field
The present invention relates to a kind of dynamic and visual observation procedure of diesel fuel system high pressure fuel cavitation, belong to Diesel Engine Technique Field.
Background technology
Along with the development of society, people's environmental pollution is more and more paid attention to, pollution emission proportion in whole environmental pollution of vehicle holds the balance, and China's National Environmental goal motor vehicle exhaust emission index from 2012 reaches Europe IV and state V standard.Reduce motor vehicle exhaust emission index, basic measure is the burning quality improving fuel oil.For diesel engine, ensure that the fuel oil of high pressure and voltage stabilizing is the fundamental way improving oil inflame quality.But the oil spout quality that have impact on fuel injector that fuel pressure fluctuates and fuel oil cavitation phenomenon is serious under high-pressure situations, cause the fuel oil quality sprayed in engine chamber uneven permanent, mixture combustion is abnormal, the change of the performance index such as output power and torque ripple is large, the increase of exhaust emissions index.Therefore, the pressure surge of research diesel fuel system fuel oil within the scope of 160MPa ~ 280MPa and cavitation phenomenon, understand the mechanism of fuel pressure fluctuation and cavitation phenomenon, find the method solving or reduce pressure surge and cavitation phenomenon, further raising oil spout quality and burning efficiency, for optimal design diesel fuel system provides theory support, a kind of cavitation phenomenon process that can occur the high pressure fuel of diesel fuel system is needed to carry out the method for visual research.
Summary of the invention
The object of the invention is the mechanism in order to understand fuel pressure fluctuation and cavitation phenomenon, for optimal design diesel fuel system provides theory support, propose a kind of dynamic and visual observation procedure of diesel fuel system high pressure fuel cavitation, the fuel flow situation at the circular conical surface place of playing fuel feeding and oil-break effect in diesel fuel system can be observed.
The present invention is in order to realize above-mentioned object, and the method taked is:
Step one, Fuel Injection Pump Test-Bed builds pilot system.Electronically controlled unit pump connects the output unit of Fuel Injection Pump Test-Bed, as the oil sources providing high pressure fuel to pilot system; High-pressure oil pipe one end connects electronically controlled unit pump, and the other end connects the oil-feed port of optics cone valve, and the fuel-displaced port of optics cone valve is connected on electric-controlled fuel injector by high-pressure oil pipe.Single-chip computer control system (ECU) is connected with the solenoid valve of electronically controlled unit pump and the solenoid valve of electric-controlled fuel injector respectively, and the energising of control two solenoid valves and break impulse are to open and close.High-speed camera is installed on the observation end of optics cone valve, and light source is positioned at the second valve body side, is irradiated to spool place by the second valve body.
Described optics cone valve comprises the first valve body, spool, baffle plate, the second valve body, pressing plate and the 3rd valve body, and the first valve body, the second valve body and the 3rd valve body to be fixed together formation body structure successively by bolt; Make a conical bore from the second valve body end face along direction, axis, circular cone is coaxial with casing, and cone tip does not penetrate the second valve body; Axis along the 3rd valve body makes oil input channel, penetrates the 3rd valve body, and is connected with conical bore through the second valve body; Spool is assemblied in the conical bore of the second valve body; First valve body makes center pit along axis, is communicated with the conical bore of the second valve body, and processes oil duct in the side of the first valve body, is connected with center pit; Baffle plate is clear glass cylinder structure, is installed in the center pit of the first valve body and the conical bore of the second valve body, contacts with the wall of center pit and spool end face; Pressing plate is arranged on the first valve body end face, and by bolt presses baffle plate, baffle plate and pressing plate stop that spool moves horizontally along fuel flow direction jointly.Pressing plate center is circular hole, as the observation end of optics cone valve.
The conical bore top of described spool and the second valve body forms cone match, and circular conical surface and the second valve body conical bore top angulation of spool are poor.Differential seat angle size regulates by the mode adding and subtracting pad between pressing plate and the first valve body.Differential seat angle is less, and oil body flows through the circular cone conical surface and more easily produces cavitation.
Described second valve body is transparent optical organic glass material.
Step 2, process of the test.The photo opporunity arranging high-speed camera is synchronous with the action of two solenoid valves, the conical surface place that camera lens focus is formed at spool and the second valve body conical bore top, arranges the capture rate of video camera, allows to take clear photograph.The solenoid valve of solenoid valve and electric-controlled fuel injector that single-chip computer control system (ECU) controls electronically controlled unit pump is opened, high pressure fuel is through the oil input channel of the 3rd valve body and the second valve inner, flow through the circular conical surface of the second valve inner, enter the oil road of the first valve inner.About the angle of advance of opening and closing time of control two solenoid valves and the parameter value of duration angle in adjustment single-chip computer control system (ECU), make optics cone valve oil-feed port and oil outlet end interruption-forming pressure difference value; There is cavitation phenomenon at circular conical surface place in fuel oil, high-speed camera utilizes the light source be radiated on circular cone end face, takes pictures to the cavitation phenomenon occurring in circular cone end.When reaching the duration angle of setting, the solenoid valve of solenoid valve and electric-controlled fuel injector that single-chip computer control system (ECU) controls electronically controlled unit pump cuts out simultaneously.
Step 3, the aftertreatment of test figure.Gray analysis is carried out to the photo of high-speed camera shooting, calculates the change procedure of the cavitation phenomenon of high pressure fuel under the pressure difference value and parameter index of step 2 at optics cone valve inner conical face place.
Step 4, change Controlling solenoid valve and open and close the differential seat angle that the angle of advance of time and the parameter value of duration angle or optics poppet spool valve circular conical surface and the second valve body conical bore top formed, repeat step 2 and step 3, obtain the change procedure of the cavitation phenomenon under different operating mode.
Beneficial effect
The research of relative and traditional diesel fuel system fuel oil cavitation phenomenon, the inventive method has the following aspects advantage:
One, can observe by dynamic and visual, fuel system fuel feeding and oil-break moment under different operating modes, the change procedure of the cavitation phenomenon that sealing circular cone end produces;
Two, by the analysis of variance procedure result of cavitation phenomenon, the reason producing diesel fuel system pressure surge can better be explained.
Accompanying drawing explanation
Fig. 1 is the pilot system schematic diagram of inventive method;
Fig. 2 is the 3 dimensional drawing of the application apparatus (optics cone valve) of the inventive method;
Fig. 3 is the wiring layout of the application apparatus (optics cone valve) of inventive method in embodiment; Wherein (a) is front view, and (b) is vertical view figure, and (c) is left view figure;
Fig. 4 is the structural drawing of application apparatus (optics cone valve) critical part of inventive method in embodiment.Wherein (a) is front view, and (b) is partial enlarged drawing, (c) partial enlarged drawing;
Label declaration: 1-first valve body, 2-spool, 3-baffle plate, 4-second valve body, 5-pressing plate, 6-the 3rd valve body, 7-observes end, 8-oil-feed port, the fuel-displaced port of 9-, 10-oil input channel, 11-oil road.
Embodiment
In embodiment, utilize a kind of visual optics cone valve research device based on the inventive method.
From accompanying drawing 2 and accompanying drawing 3, optics cone valve is made up of the first valve body, spool, baffle plate, the second valve body, pressing plate and the 3rd valve body.Together with first valve body, the second valve body are bolted on the 3rd valve body, the carrier part of composition optics cone valve; Spool is assemblied in the second valve body middle circle taper hole, and baffle plate and pressing plate are arranged on the first valve body, stops that spool moves horizontally along fuel flow direction.
Composition graphs 3 illustrates the method for invention, the silica glass material that spool described in the inventive method and baffle plate select transmittance high, valve element circle conical surface angle is 118 °, circular conical surface width is 0.4mm, spool outwards can be moved horizontally by adjustment pad, form the clearance fit of the valve element circle conical surface and the second valve body circular conical surface, moving range is 0.005mm ~ 0.02mm, and clearance fit face is the main region producing cavitation phenomenon.
Composition graphs 3 illustrates the method for invention, and the second valve body uses pmma material, and can ensure circular cone end in the middle of light source irradiation to the second valve body, the circular cone end face angle 122 ° of interstitial hole, conical surface width is 0.5mm.In case that there is no gap, circular conical surface angle is 2 °, is linear contact lay for the valve element circle conical surface and the middle circular cone mating surface place of the second valve body.
Composition graphs 3 illustrates the method for invention, and the first valve body and the 3rd valve body select 45 Steel materials, the end face of the combination of itself and the second valve body has diameter be Φ 1 unload oil duct.Can effectively prevent under high pressure operating mode, oil suction chamber and the high pressure fuel leakage of oil gone out in oil pocket.
The application apparatus (optics cone valve) that the inventive method uses is arranged in diesel engine dual-coil electromagnetic valve fuel system, electronically controlled unit pump provides high pressure fuel, the oil inlet end of the 3rd valve body is connected by high-pressure oil pipe, high pressure fuel is through the oil duct of the 3rd valve body and the second valve inner, flow through the circular conical surface of the second valve inner, what enter the first valve inner goes out oil pocket.There is cavitation phenomenon at circular conical surface place in fuel oil, due in the valve element circle conical surface and the second valve body middle circle cone match gap smaller (0.005mm ~ 0.02mm); Fuel oil, in narrow and small narrow slit, causes flowing velocity to increase, and internal pressure reduces, and when saturated vapor pressure lower than fuel oil of the fuel pressure at circular conical surface place, the bubble in fuel oil just occurs in spool and the second valve body mating surface place, forms cavitation phenomenon.High-speed camera utilizes the light source be radiated on circular cone end face, takes pictures to the cavitation phenomenon occurring in circular cone end; Then utilize image processing software, the photo occurring in not cavitation phenomenon is in the same time processed, analyzes the generating process of cavitation phenomenon according to the change of gray-scale value.
Claims (4)
1. the dynamic and visual observation procedure of diesel fuel system high pressure fuel cavitation, is characterized in that: specifically comprise the steps:
Step one, Fuel Injection Pump Test-Bed builds pilot system; Electronically controlled unit pump connects the output unit of Fuel Injection Pump Test-Bed, as the oil sources providing high pressure fuel to pilot system; High-pressure oil pipe one end connects electronically controlled unit pump, and the other end connects the oil-feed port of optics cone valve, and the fuel-displaced port of optics cone valve is connected on electric-controlled fuel injector by high-pressure oil pipe; Single-chip computer control system is connected with the solenoid valve of electronically controlled unit pump and the solenoid valve of electric-controlled fuel injector respectively, and the energising of control two solenoid valves and break impulse are to open and close; High-speed camera is installed on the observation end of optics cone valve, and light source is positioned at the second valve body side of optics cone valve, is irradiated to spool place by the second valve body;
Described optics cone valve comprises the first valve body, spool, baffle plate, the second valve body, pressing plate and the 3rd valve body; First valve body, the second valve body and the 3rd valve body to be fixed together formation body structure successively by bolt; Make a conical bore from the second valve body end face along direction, axis, circular cone is coaxial with casing, and cone tip does not penetrate the second valve body; Axis along the 3rd valve body makes oil input channel, penetrates the 3rd valve body, and is connected with conical bore through the second valve body; First valve body makes center pit along axis, is communicated with the conical bore of the second valve body, and processes oil duct in the side of the first valve body, is connected with center pit; Baffle plate is clear glass cylinder structure, is installed in the center pit of the first valve body and the conical bore of the second valve body, contacts with the wall of center pit and spool end face; Pressing plate is arranged on the first valve body end face, and by bolt presses baffle plate, pressing plate center is circular hole, as the observation end of optics cone valve;
Described spool is assemblied in the conical bore of the second valve body, forms cone match with the conical bore top of the second valve body, and circular conical surface and the second valve body conical bore top angulation of spool are poor;
Step 2, process of the test; The photo opporunity arranging high-speed camera is synchronous with the action of two solenoid valves, the conical surface place that camera lens focus is formed at spool and the second valve body conical bore top, arranges the capture rate of video camera; The solenoid valve that single-chip computer control system controls the solenoid valve of electronically controlled unit pump and electric-controlled fuel injector is opened, and high pressure fuel, through the oil input channel of the 3rd valve body and the second valve inner, flows through the circular conical surface of the second valve inner, enters the oil road of the first valve inner; About the angle of advance of opening and closing time of control two solenoid valves and the parameter value of duration angle in adjustment single-chip computer control system, make optics cone valve oil-feed port and oil outlet end interruption-forming pressure difference value; There is cavitation phenomenon at circular conical surface place in fuel oil, high-speed camera utilizes the light source be radiated on circular cone end face, takes pictures to the cavitation phenomenon occurring in circular cone end; When reaching the duration angle of setting, single-chip computer control system controls the solenoid valve of electronically controlled unit pump and the solenoid valve of electric-controlled fuel injector cuts out simultaneously;
Step 3, the aftertreatment of test figure: gray analysis is carried out to the photo of high-speed camera shooting, calculates the change procedure of the cavitation phenomenon of high pressure fuel under the pressure difference value and parameter index of step 2 at optics cone valve inner conical face place;
Step 4, change Controlling solenoid valve and open and close the differential seat angle that the angle of advance of time and the parameter value of duration angle or optics poppet spool valve circular conical surface and the second valve body conical bore top formed, repeat step 2 and step 3, obtain the change procedure of the cavitation phenomenon under different operating mode.
2. the dynamic and visual observation procedure of diesel fuel system high pressure fuel cavitation according to claim 1, is characterized in that: described baffle plate and pressing plate stop that spool moves horizontally along fuel flow direction jointly.
3. the dynamic and visual observation procedure of diesel fuel system high pressure fuel cavitation according to claim 1, is characterized in that: the circular conical surface of described spool and the differential seat angle size on the second valve body conical bore top regulate by the mode adding and subtracting pad between pressing plate and the first valve body; Differential seat angle is less, and oil body flows through the circular cone conical surface and more easily produces cavitation.
4. the dynamic and visual observation procedure of diesel fuel system high pressure fuel cavitation according to claim 1, is characterized in that: described second valve body is transparent optical organic glass material.
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| CN105484918B (en) * | 2015-12-06 | 2017-11-03 | 北京工业大学 | A kind of method for controlling oil return of monoblock pump fuel system |
| CN105538155B (en) * | 2015-12-07 | 2018-10-26 | 广州汇专工具有限公司 | A kind of on-Line Monitor Device for ultrasound ELID internal grinding cavitation effects |
| CN105628359B (en) * | 2015-12-27 | 2017-11-21 | 北京工业大学 | A kind of diesel engine single body pump fuel system balanced valve dynamic and visual experimental rig and test method |
| CN106197962B (en) * | 2016-06-15 | 2018-08-31 | 北京理工大学 | A kind of direct observation experiment platform of automobile-used rotatory sealing cavitation zone |
| CN106053041A (en) * | 2016-06-27 | 2016-10-26 | 北京工业大学 | Testing device and testing method for improving cavitation of common rail system high pressure oil pump inlet valve |
| CN106018149A (en) * | 2016-08-09 | 2016-10-12 | 河南柴油机重工有限责任公司 | Visual cylinder liner cavitation erosion test device and method |
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| ITTO20010970A1 (en) * | 2001-10-12 | 2003-04-12 | Fiat Ricerche | FUEL INJECTOR FOR AN INTERNAL COMBUSTION ENGINE. |
| JP3959687B2 (en) * | 2002-11-13 | 2007-08-15 | いすゞ自動車株式会社 | Fuel spray observation device |
| CN203350196U (en) * | 2013-01-05 | 2013-12-18 | 中国航空工业集团公司西安飞机设计研究所 | Oil supply state observation device |
| CN103487232B (en) * | 2013-06-28 | 2015-09-02 | 江苏大学 | A kind of self-circulating device of transparent nozzle interior hole flow visual research |
| CN103471833B (en) * | 2013-09-13 | 2015-07-08 | 江苏大学 | Testing device and method capable of achieving transient measurement of nozzle internal flow under multiple working conditions |
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