CN104989570A - Main and assistant integrated nonlinear rectification oil atomizer - Google Patents

Main and assistant integrated nonlinear rectification oil atomizer Download PDF

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Publication number
CN104989570A
CN104989570A CN201510392865.1A CN201510392865A CN104989570A CN 104989570 A CN104989570 A CN 104989570A CN 201510392865 A CN201510392865 A CN 201510392865A CN 104989570 A CN104989570 A CN 104989570A
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China
Prior art keywords
oil
needle
main
solenoid valve
duct
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CN201510392865.1A
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CN104989570B (en
Inventor
魏民祥
常诚
季昊成
刘锐
魏鑫月
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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Abstract

The invention discloses a main and assistant integrated nonlinear rectification oil atomizer and belongs to the field of engines. The main and assistant integrated nonlinear rectification oil atomizer comprises an oil atomizer body with a main oil duct and an assistant oil duct which are communicated with an oil inlet; the cross sectional area of the main oil duct is larger than that of the assistant oil duct; the main oil duct and the assistant oil duct are internally provided with oil supply control devices of the same structure; the oil supply control devices are connected with an electric control unit and provided with oil supply channels communicated with the oil ducts; the oil supply control devices control opening and closing of an oil duct outlet. The two oil ducts are adopted and can spray oil at the same time, so that the oil atomizer meets the requirement for spraying a large amount of fuel oil within the short time when a direct injection engine in a two-stroke cylinder is high in speed and large in load, and also meets the requirement for achieving nonlinear rectification on the working area of the oil atomizer, the problems that an oil atomizer does not spray oil when the oil spraying pulse width is small and the oil spraying amount cannot be accurately controlled are solved, and the fuel economy and the power performance of the engine are improved.

Description

Master and secondary integrated gamma correction oil sprayer
Technical field
The present invention relates to a kind of engine fuel injector, be specifically a kind of master and secondary integrated gamma correction oil sprayer, belong to engine art.
Background technique
at present, along with the raising day by day of national combustion motor emission request, under the prerequisite ensureing engine power performance, improve fuel economy, improve discharge also one of core becoming engine research, this just has higher requirement to the control accuracy of oil sprayer.
In prior art, electromagnetic valve type fuel injector is mainly single pass oil sprayer.Think that the Flow characteristics of electric-controlled fuel injector is linear in the ordinary course of things, so it can be used as linear actuator to use, but in fact due to the impact of the factors such as needle-valve inertia, electromagnetic coil electromagnetic force and armature quality, Conventional fuel injectors has one section of inelastic region when little fuel injection pulsewidth, this section of inelastic region comprises: 1, invalid injection phase, i.e. the fuel injection pulsewidth too small stage causing needle-valve to open, this phase fuel cannot spray; 2, transition stage, but namely needle-valve can be opened and is not enough to the stable stage of opening, and the unstability of fuel flow in addition, makes this stage spray characteristic be non-linear.Do not consider that the fuel injection quantity causing electronic control injection when little pulsewidth and design load are existed larger error by this section of region, especially even more serious in the operating mode such as idling, Smaller load of little bore engine.In addition, motor is under the operating mode of the large load of high speed, need larger fuel injection quantity, because the dust cycle of in-cylinder direct injection two stroke engine is extremely short, exhaust loss to be avoided as far as possible, the large oil mass realized under relief opening closedown condition completely is accurately sprayed, and its discharge time is very restricted, and therefore necessarily requires oil sprayer can complete the injection of great amount of fuel oil within the short time (Millisecond).If select the oil sprayer compared with large discharge to meet such condition, when this will cause little fuel injection pulsewidth, oil sprayer is operated in inelastic region; If select the demand of the short time large oil mass that cannot meet high speed high load working condition compared with the oil sprayer of small flow to make oil sprayer working area avoid inelastic region on the contrary.
Summary of the invention
Technical problem to be solved by this invention is to overcome prior art defect, a kind of eject request that not only can meet short time large oil mass is provided, the master and secondary integrated oil sprayer of gamma correction can also be realized, with the stability of the control accuracy and fuel injection quantity that improve oil sprayer under the condition of little fuel injection pulsewidth.
In order to solve the problems of the technologies described above, master and secondary integrated gamma correction oil sprayer provided by the invention, comprises oil sprayer main body, and described oil sprayer main body is provided with the main oil gallery and auxiliary oil duct that are communicated with filler opening, and the cross sectional area of described main oil gallery is greater than auxiliary oil duct; Described main oil gallery be respectively equipped with the identical controller for supplying oil of structure in auxiliary oil duct, described controller for supplying oil connects ECU (Electrical Control Unit), and described controller for supplying oil is provided with the oil supply gallery communicated with oil duct, and controller for supplying oil controls the switch of oil passage outlet.
In the present invention, described controller for supplying oil comprises solenoid valve, elastic recoil mechanism, motion needle; Described solenoid valve is fixed in oil duct, and described motion needle is movably arranged on below solenoid valve, can move up and down along oil duct, and described motion needle is connected with solenoid valve by elastic recoil mechanism; Described solenoid valve and motion needle inside are equipped with the oil supply gallery connected with oil duct.
In the present invention, described motion needle comprises armature and needle, and described armature is connected with solenoid valve by elastic recoil mechanism, described needle is string configuration, the top of needle is connected with armature and is communicated with solenoid valve, and the middle part of needle is provided with oil outlet, and the bottom of needle is close to oil passage outlet.
In the present invention, in described main oil gallery controller for supplying oil, the weight of armature and needle is greater than the weight of armature and needle in auxiliary oil duct controller for supplying oil.
In the present invention, described elastic recoil mechanism is spring.
In the present invention, described ECU (Electrical Control Unit) comprises control module and 2 driver modules be connected with control module respectively, and described 2 driver modules are connected with the solenoid valve of main oil gallery and auxiliary oil duct controller for supplying oil respectively, the power supply of Controlling solenoid valve.
In the present invention, in described main oil gallery controller for supplying oil, the number of turn of electromagnetic valve coil is more than the number of turn of electromagnetic valve coil in auxiliary oil duct controller for supplying oil.
Beneficial effect of the present invention is: (1), adopt two oil ducts can simultaneously oil spout, make oil sprayer both can meet like a cork two-stroke in-cylinder direct fuel-injection engine at a high speed large load time short time in the great amount of fuel oil requirement of spraying, also oil sprayer working zone can be made to avoid the requirement of inelastic region, avoid the exhaust loss of fuel, the problem that when solving little fuel injection pulsewidth, oil sprayer not oil spout and fuel injection quantity cannot accurately control, meet the demand that the short time large oil mass of inelastic region and high speed high load working condition is avoided in oil sprayer working area simultaneously, improve fuel economy and the power performance of motor, (2), structure of the present invention is simple, easy to use, by between two fuel injection passages with the use of making the control of oil sprayer more accurate.
Accompanying drawing explanation
Fig. 1 is the present invention's master and secondary integrated gamma correction fuel injector structure schematic diagram.
Fig. 2 is the control section schematic diagram of ECU (Electrical Control Unit).
Fig. 3 is the driver module circuit diagram of ECU (Electrical Control Unit).
In figure: 1-oil sprayer main body, 2-filler opening, 3-fuel screen, 4-Wiring harness connector, 5-first solenoid valve, 6-first return spring, 7-first armature, 8-first needle, 9-first jet, 10-ECU (Electrical Control Unit), 11-second solenoid valve, 12-second return spring, 13-second armature, 14-second needle, 15-second nozzle, 16-needle internal galleries, 17-main oil gallery, the auxiliary oil duct of 18-.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, the master and secondary integrated gamma correction oil sprayer of the present invention, comprise oil sprayer main body 1 and ECU (Electrical Control Unit) 10, oil sprayer main body 1 is provided with main oil gallery 17 and auxiliary oil duct 18, the cross sectional area of main oil gallery 17 is relatively large, the cross sectional area of auxiliary oil duct 18 is relatively little, and the flow of main oil gallery 17 is greater than the flow of auxiliary oil duct 18.Main oil gallery 17 and auxiliary oil duct 18 top all communicate with filler opening 2, and filler opening 2 is provided with fuel screen 3.The bottom of main oil gallery 17 is communicated with auxiliary oil duct 18 with first jet 9, and first jet 9 is provided with multiple spray orifice; The bottom of auxiliary oil duct 18 is communicated with second nozzle 15, and second nozzle 15 is provided with multiple spray orifice.
First solenoid valve 5 is arranged in main oil gallery 17, is positioned at the top of main oil gallery 17, and the first solenoid valve 5 inside is provided with passage and communicates with filler opening 2, and the electromagnetic coil of the first solenoid valve 5 is electrically connected with ECU (Electrical Control Unit) 1.First armature 7 is movably arranged on the below of the first solenoid valve 5, first armature 7 can slide up and down along the inwall of main oil gallery 17, is provided with through hole in the first armature 7, and the first needle 8 is through through hole, and interference fit between the first armature 7, the first needle 8 moves with the first armature 7.Interference step on first needle 8 connects the first return spring 6, first return spring 6 and is arranged in the passage of the first solenoid valve 5, and the upper end of the first return spring 6 contacts with positioning boss in the first solenoid valve 5, and oil sprayer main body 1 geo-stationary.Upper half part inside of the first needle 8 is provided with oil duct 16, oil duct 16 communicates with the first solenoid valve 5, filler opening 2 formation oil supply gallery, lower half portion of first needle 8 has two oil outlets be connected with main oil gallery 17, and oil outlet is communicated with inner chamber and the exocoel of the first needle 8; The bottom section of the first needle 8 is greater than main oil gallery 17 outlet, can carry out closing or opening to main oil gallery 17 outlet.
Second solenoid valve 11 is arranged in auxiliary oil duct 18, is positioned at the middle part of auxiliary oil duct 18, and the second solenoid valve 11 inside is provided with passage, and communicates with filler opening 2, and the electromagnetic coil of the second solenoid valve 11 is electrically connected with ECU (Electrical Control Unit) 1.Second armature 13 is movably arranged on the below of the second solenoid valve 11, second armature 13 can slide up and down along the inwall of auxiliary oil duct 18, is provided with through hole in the second armature 13, and the second needle 14 is through through hole, and interference fit between the secondth armature 13, the second needle 14 moves with the second armature 13.Interference step on second needle 14 connects the second return spring 12, second return spring 12 and is arranged in the passage of the second solenoid valve 11, and the upper end of the second return spring 12 contacts with the second solenoid valve 11 inner position boss, and oil sprayer main body 1 geo-stationary.Oil duct 16 is provided with in upper half part inside of the second needle 14, oil duct 16 communicates with the second solenoid valve 11, filler opening 2 formation oil supply gallery, lower half portion of second needle 14 has two oil outlets be connected with auxiliary oil duct 18, and oil outlet is communicated with inner chamber and the exocoel of the second needle 14; The bottom section of the second needle 14 is greater than auxiliary oil duct 18 outlet, can close auxiliary oil duct 18 outlet or open.
Cross sectional area due to main oil gallery 17 is the cross sectional area of auxiliary oil duct 18, in order to respective channels be in accordance, the cross sectional area of the first needle 8 is greater than the cross sectional area with the second needle 12, under the condition of identical length and material, the weight of the first needle is greater than the quality of the second needle 12, accordingly, the volume of the first armature 7 and weight are also greater than volume and the weight of the second armature 13.
ECU (Electrical Control Unit) 10 is arranged on the outside of oil sprayer main body 1, and ECU (Electrical Control Unit) 10 is connected with Engine ECU by Wiring harness connector 4.
As shown in Figure 2, ECU (Electrical Control Unit) 10 comprises two driver modules and control module, two driver module link control modules, and the core single-chip microcomputer of control module is connected with Engine ECU; First driver module is electrically connected with the electromagnetic coil of the first solenoid valve 5, and the second driver module is electrically connected with the electromagnetic coil of the second solenoid valve 11.The core single-chip microcomputer of control module receives the fuel injection pulsewidth signal that Engine ECU sends, and after then fuel injection pulsewidth being carried out further analysing and processing, controls the switching electricity of the electromagnetic coil of two driver modules respectively.ECU (Electrical Control Unit) is carried out according to following rule the control of fuel injection pulsewidth and allocation strategy:
Pre-set 2 threshold values in the control module---pulsewidth 1 and pulsewidth 2;
The fuel injection pulsewidth value sent to control module when Engine ECU is less than or equal to pulsewidth 1, and so control module is by the work of control second driver module, the secondary channels work of oil sprayer;
Be greater than pulsewidth 1 when Engine ECU to the fuel injection pulsewidth value that control module sends and be less than fuel injection pulsewidth 2, so control module controls driver module by first, the main passage work of oil sprayer;
The fuel injection pulsewidth value sent to control module when Engine ECU is less than or equal to pulsewidth 2, and so control module will control the first driver module and the second driver module simultaneously, and the main and auxiliary passage of oil sprayer works simultaneously.
As shown in Figure 3, in drive circuit, control signal drives optocoupler work through the amplification of triode Q3.1, and the break-make of optocoupler determines the voltage difference of metal-oxide-semiconductor grid and source class, thus reaches and control the break-make of electromagnetic coil in solenoid valve.Optocoupler in circuit by the driving pin of microcontroller in control module and oil sprayer drive end (i.e. solenoid valve) isolation, can improve the anti-interference of circuit, also plays a protective role to the pin of microcontroller simultaneously.The electric current exported due to microcontroller pin can not work by Direct driver optocoupler, adds a triode, regulated the firing current of optocoupler by the size of regulating resistance R3.2 in optocoupler front end.The grid of metal-oxide-semiconductor is connected with the output terminal of optocoupler, drains to be connected with the low side of oil sprayer, source ground.When the oil spout of microcontroller drives pin to export high level, triode Q3.1 conducting, optocoupler work, the grid of metal-oxide-semiconductor is drawn high, and the drain electrode of metal-oxide-semiconductor and source class are connected, and the conducting of oil sprayer drive coil, oil sprayer is opened.Otherwise the control pin output low level of microcontroller, metal-oxide-semiconductor ends, and oil sprayer cuts out.The effect of diode D3.1 is afterflow, the moment that oil sprayer cuts out, and electromagnetic coil can induce very high induction electromotive force, and induction electromotive force flows in storage battery by diode D3.1, avoids excessive induction electromotive force to puncture metal-oxide-semiconductor.
When have the fuel oil of certain pressure by filler opening, fuel screen after enter into the inside of oil sprayer, finally entered into the bottom of oil duct by the passage of needle inside and the oil outlet of both sides, set up the oil pressure identical with oil-feed place.Return spring is in its pre-compressed state, and its one end contacts with the positioning boss of solenoid valve inside, and the other end is directly connected with needle, keeps consistent with armature movement.Under original state, no current in electromagnetic coil in solenoid valve, armature and needle are subject to the acting in conjunction that in the downward power of spring and oil duct, fuel oil upwards pressure, and the direction of making a concerted effort is downward, and needle is taken a seat, and oil passage outlet is closed; After electromagnetic coil energising in solenoid valve, due to the impact of electromagnetic force, make the direction of making a concerted effort become upwards, armature and needle move oil passage outlet and opens, the spray orifice commencement of fuel injection on nozzle.
The present invention mainly relies on the start-up time of Controlling solenoid valve and endurance to control oil spout starting point and fuel injection quantity, and therefore the selection of solenoid valve directly affects response performance and the distributive ability of oil sprayer.The principal element affecting solenoid valve actuation time has coil turn, core material, leakage field and power supply voltage etc., when designing the solenoid valve of electromagnetism two passages, except coil turn, other influence factor is all considered as identical, so only consider affecting solenoid valve of coil turn herein.Coil turn affect the size that essence is inductance, the many coil inductance of the number of turn is large, and electromagnetic attraction is large, but time constant increases and causes current-responsive slow, is unfavorable for the quick acting of solenoid valve.Select to make the number of turn of electromagnetic coil in the first solenoid valve 5 more than the number of turn of electromagnetic coil in the second solenoid valve 11 during coil turn according to above-mentioned analysis, the reason of such way is: the first armature 7 that weight is larger and the second needle 8 are subject to larger electromagnetic attraction, first solenoid valve 5 of main oil gallery 17 can ensure to make the first needle-valve 8 moves under the condition of enough current"on"time, but when little fuel injection pulsewidth because electromagnetic conversion process is long, be difficult to make the second armature 7 and the first needle-valve 8 action, cannot fuel feeding be carried out; The second armature 13 that weight is less and the second needle 14 can actions fast, even the second solenoid valve 11 of auxiliary oil duct 18 can ensure that also can there be good action response shorter current"on"time, namely normally can work under the condition of little fuel injection pulsewidth and carry out fuel feeding, but its oil spout flow is restricted, enough fuel deliveries can not be ensured when large pulsewidth.
The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, can also make some improvement under the premise without departing from the principles of the invention, and these improvement also should be considered as protection scope of the present invention.

Claims (7)

1. a master and secondary integrated gamma correction oil sprayer, comprises oil sprayer main body, it is characterized in that: described oil sprayer main body is provided with the main oil gallery and auxiliary oil duct that are communicated with filler opening, and the cross sectional area of described main oil gallery is greater than auxiliary oil duct; Described main oil gallery be respectively equipped with the identical controller for supplying oil of structure in auxiliary oil duct, described controller for supplying oil connects ECU (Electrical Control Unit), and described controller for supplying oil is provided with the oil supply gallery communicated with oil duct, and controller for supplying oil controls the switch of oil passage outlet.
2. master and secondary integrated gamma correction oil sprayer according to claim 1, is characterized in that: described controller for supplying oil comprises solenoid valve, elastic recoil mechanism, motion needle; Described solenoid valve is fixed in oil duct, and described motion needle is movably arranged on below solenoid valve, can move up and down along oil duct, and described motion needle is connected with solenoid valve by elastic recoil mechanism; Described solenoid valve and motion needle inside are equipped with the oil supply gallery connected with oil duct.
3. master and secondary integrated gamma correction oil sprayer according to claim 2, it is characterized in that: described motion needle comprises armature and needle, described armature is connected with solenoid valve by elastic recoil mechanism, described needle is string configuration, the top of needle is connected with armature and is communicated with solenoid valve, the middle part of needle is provided with oil outlet, and the bottom of needle is close to oil passage outlet.
4. master and secondary integrated gamma correction oil sprayer according to claim 3, is characterized in that: in described main oil gallery controller for supplying oil, the weight of armature and needle is greater than the weight of armature and needle in auxiliary oil duct controller for supplying oil.
5. the master and secondary integrated gamma correction oil sprayer according to claim 2,3 or 4, is characterized in that: described elastic recoil mechanism is spring.
6. the master and secondary integrated gamma correction oil sprayer according to any one of Claims 1-4, it is characterized in that: described ECU (Electrical Control Unit) comprises control module and 2 driver modules be connected with control module respectively, described 2 driver modules are connected with the solenoid valve of main oil gallery and auxiliary oil duct controller for supplying oil respectively, the power supply of Controlling solenoid valve.
7. master and secondary integrated gamma correction oil sprayer according to claim 6, is characterized in that: in described main oil gallery controller for supplying oil, the number of turn of electromagnetic valve coil is more than the number of turn of electromagnetic valve coil in auxiliary oil duct controller for supplying oil.
CN201510392865.1A 2015-07-07 2015-07-07 Master and secondary integrated gamma correction fuel injector Active CN104989570B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106401825A (en) * 2016-12-09 2017-02-15 杭州电子科技大学 Dual-solenoid-valve control diesel injector
CN110307110A (en) * 2019-06-26 2019-10-08 河南美力达汽车有限公司 A kind of master and secondary integrated gamma correction fuel injector

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08326629A (en) * 1995-05-31 1996-12-10 Mitsubishi Motors Corp Fluid injection device
JP2005320871A (en) * 2004-05-06 2005-11-17 Niigata Power Systems Co Ltd Fuel injection system for diesel engine
JP2006029203A (en) * 2004-07-15 2006-02-02 Mitsubishi Heavy Ind Ltd Diesel engine equipped with pilot fuel device and method for operating the same
CN101025137A (en) * 2006-02-17 2007-08-29 株式会社日立制作所 Electro-magneto fuel injector
JP2013124586A (en) * 2011-12-14 2013-06-24 Denso Corp Dual injector
US20140346254A1 (en) * 2014-08-07 2014-11-27 Caterpillar Inc. Fuel injector for gaseous injection

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08326629A (en) * 1995-05-31 1996-12-10 Mitsubishi Motors Corp Fluid injection device
JP2005320871A (en) * 2004-05-06 2005-11-17 Niigata Power Systems Co Ltd Fuel injection system for diesel engine
JP2006029203A (en) * 2004-07-15 2006-02-02 Mitsubishi Heavy Ind Ltd Diesel engine equipped with pilot fuel device and method for operating the same
CN101025137A (en) * 2006-02-17 2007-08-29 株式会社日立制作所 Electro-magneto fuel injector
JP2013124586A (en) * 2011-12-14 2013-06-24 Denso Corp Dual injector
US20140346254A1 (en) * 2014-08-07 2014-11-27 Caterpillar Inc. Fuel injector for gaseous injection

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106401825A (en) * 2016-12-09 2017-02-15 杭州电子科技大学 Dual-solenoid-valve control diesel injector
CN106401825B (en) * 2016-12-09 2018-12-07 杭州电子科技大学 Dual-coil electromagnetic valve controls diesel injector
CN110307110A (en) * 2019-06-26 2019-10-08 河南美力达汽车有限公司 A kind of master and secondary integrated gamma correction fuel injector
CN110307110B (en) * 2019-06-26 2021-07-23 河南美力达汽车有限公司 Main and auxiliary integrated nonlinear correction oil sprayer

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Application publication date: 20151021

Assignee: Nanjing Jincheng Machinery Co.,Ltd.

Assignor: Nanjing University of Aeronautics and Astronautics

Contract record no.: X2020980000587

Denomination of invention: Main and assistant integrated nonlinear rectification oil atomizer

Granted publication date: 20171208

License type: Exclusive License

Record date: 20200311