CN1389643A - Micropulsated fuel oil jetting system - Google Patents

Abstract

A kind micro pulsation fuel oil injection system, comprises a throttle valve in the air access of a interior burning engine cylinder to control the flow of the air entering the burning chamber. Many ejection units are set on the throttle valve. Every ejection unit has several micropump to draw the fuel oil, and spray the fuel oil as power into the air access of the throttle valve, that makes the fuel powder mixed with the air from the throttle valve into the burning chamber. After the running parameter measured by a control device, a driving device drive the ejection unit to spray a definite quantity of the oil in to the throttle valve, thus, the exact oil burning quantity can be controlled to improve the burning efficiency.

Description

Micropulsated fuel oil jetting system

The present invention relates to a kind of micropulsated fuel oil jetting system, relate in particular to a kind of micropulsated fuel oil jetting system that is used in internal combustion engine.

The main flow of the oil supply system of using by present internal combustion engine can be divided into carburetor oil-supply system, and two kinds of electrospray oil supply systems.As shown in Figure 8, mechanical type Carburetor 60 is that a kind of venturi-effect that utilizes also atomizes fuel oil from the nozzle opening sucking-off, and Carburetor 60 mainly comprises the throttle valve body 70 of a control air inflow and the spindle 61 of a main oil mass of control.And make the cylinder that enters into internal-combustion engine after mixing along with the air inlet of internal-combustion engine after the fuel-oil atmozation, as shown in Figure 9, the Electronic Fuel Injection (EFI) supply system then is after by an electric fuel oil pumping 80 fuel oil being pressurizeed, from 81 ejections of an oil nozzle, lean on mechanical forces that fuel oil is torn and be oil bundle and elaioleucite, and enter into intake manifold 71, and make the fuel particles of ejection spray along with engine air admittance enters into cylinder with high velocity jet.

Yet, the development of traditional carburetor type oil supply system so far, it is quite complicated and accurate that its structure has become, so make the manufacturing difficulty and the cost costliness of Carburetor.During its running of carburetor oil-supply system, owing to be the purpose that reaches the control oil inlet quantity by the air flow rate that the gradient and the engine air admittance throttle valve of spindle are controlled, therefore it is difficult for accurately control fuel delivery, also can't control fuel delivery in the mode of computer control, and can't contain oil mass demand model widely, can't do correct oil mass compensation even.Carburetor can make that the situation of fuel-oil atmozation is not good, and cause spout runner oil spilling easily under the operator scheme of large throttle simultaneously, and has Residual oil to accumulate in the situation of cylinder intake duct easily, and forms wet wall phenomenon.Owing to above reason, make the complex structure of traditional carburetor oil-supply system, and the cost costliness, it can't reach the effect of accurate Control Engine burning simultaneously.

In addition, with regard to the fuel injection supply system, itself because pressurization pumping, high-pressure oil passage must be arranged and, the structure of pressure regulator valve, voltage stabilizer and nozzle, therefore make its whole spare part that uses considerably many.And owing to the oil pressure of its use generally is about more than 3 kilograms/square metre, so problem that makes spare parts such as its oil circuit and pumping pay special attention to seal, just can not produce the situation of leakage, therefore make that the constructions cost of fuel injection oil supply system is quite expensive, and because the relation of its cost costliness, make fuel injection system only use on automobile usually, and the engine of heavy-duty engine is because adopt the design of car engine, therefore the also structure of quite common employing electronic fuel injection system, yet in the field of light rail motor tractor, because cost-benefit problem, only have at present minority manufacturer begin with study with fuel injection system be applied in light rail motor tractor on.

And with regard to Security, fuel injection system since its pipeline all operate having under the pressure state, therefore when producing, collides by vehicle, or other reasons makes when oil circuit breaks, then fuel oil will spray from the slit of pipe breakage rapidly, and because the speed of ejection is quite fast, so almost can become vaporific after the fuel oil ejection, and the mist of oil of ejection is when touching the high thermoelement (Catalytic Converter) of spark or engine periphery, just catching fire at once.Therefore make that the Security of this kind fuel injection system is considerably poor.

And with regard to combustion efficiency, though fuel injection system can be by electron controls technology, reach the purpose of accurate control oil inlet quantity and comparatively accurate fuel oil compensation, because its fuel oil is to spray in the high-voltage high-speed mode, therefore the particle quite big and inhomogeneous (generally 100up SMD-sanlt meandia more than) of fuel oil when nozzle sprays, therefore make fuel fully to mix with air, and the speed of its ejection quite fast (at 20 metre per second (m/s)s), therefore after making that fuel oil sprays, therefore will inevitably touch the tube wall of cylinder intake duct in advance, make that the situation of the wet wall of spray-type fuel oil system and residual oil stain is even more serious.

Micro-electromechanical technology is in recent years because process technique significantly progressive, and ample resources input research and rapid progress is arranged, wherein the development of miniature pumping more becomes the plentifulest and substantial product of MEMS achievement in research and technology because of the shiploads of merchandise application of ink jet type table-printing machine.

Miniature pumping is mainly used in the ink gun of ink-jet table-printing machine at present, it mainly can be divided into two kinds of thermal bubble type and piezoelectricity types, wherein the structure at thermal bubble type Micropump Pu as shown in Figure 6, it is that a polysilicon layer 2 is set on a silicon substrate 1, above the silicon substrate 1 and below the brilliant silicon layer 2 isolation layer 8,9 is being set, in the centre of isolation layer 8,9 is a plain conductor 7, coated one deck universe film 3 on polysilicon layer 2 then, produce runner and circuit with etching mode on the universe film 3, and produce most jet chambers 4; And then at universe film surface attaching one deck spray nozzle board 5, spray nozzle board 5 is the manufacturing of electroformed mould technology to form, and has most and jet chamber's 4 corresponding spray orifices 6 on it.Fluid is to enter into the jet chamber via the runner of universe film, its circuit by polysilicon lower floor makes polysilicon produce heat energy then, make boiling after the fluid instantaneous heat in the jet chamber 4 and produce bubble, and by bubble that liquid is spouting from spray orifice 6 hastily.

And the technology of the miniature pumping of piezoelectricity type as shown in Figure 7, and it is that a diaphragm 2A is set above a substrate 1A, and for having formed chamber 3A, empty chamber 3A is for entering wherein for fluid between diaphragm 2A and substrate 1A; Simultaneously a piezoelectric material 4A is set on diaphragm 2A, when it bears different voltage by piezoelectric material 4A, produces the displacement of physics, and drive this diaphragm 2A vertical tremor, so the liquid compression that sky is indoor, and with the spray orifice ejection of liquid from substrate 1A.

The main feature of miniature pumping, for it can accurately control the spray volume of fluid, and the size of its nozzle is quite small, and therefore the fluid of ejection system is small granular, and reaches good atomizing effect.Because miniature pumping system forms with the manufacture of semiconductor manufacturing, therefore can on a small monomer, produce the very many nozzle arrays of quantity, and the cost of its volume production is quite cheap simultaneously.Simultaneously, miniature pumping normally transmits fluid with the capillary principle, and therefore miniature pumping operates under can be with fluid natural pressure state when running, and does not need other pressurization, makes that therefore the structure of the runner of miniature pumping and fluid feed system is quite simple.Because it is accurate that miniature pumping has above-mentioned control, and characteristics with low cost, so its application in the future will be more extensive.

The objective of the invention is to draw fuel oil, and do not need other pressurization fuel oil, make the outside oil feed line of fuel system to reach and continue the supply fuel oil by the pressure that alternate position spike caused of fuel tank by the driving force at the Micropump Pu of injection unit itself; Other makes oil-fired system that fuel oil and air inlet are fully atomized, and accurately controls oil inlet quantity; Control is sprayed fuel the special position that enters into the throttle valve gas-entered passageway from the injection unit of diverse location.

Micropulsated fuel oil jetting system of the present invention is achieved in that and comprises a throttle valve body, for being installed on the admission line of an internal combustion engine cylinder, enters the flow of this firing chamber in order to the control air; One or more oil pipe is in order to the supply fuel oil; One or more injection unit, for being installed on this throttle valve body, respectively this injection unit system is connected with aforementioned oil pipe, and it has most Micropump Pus respectively, it can be sprayed aforementioned tubing conveyed fuel oil by the action at this some Micropumps Pu and enter in the admission line of this throttle valve body with particulate, and makes fuel particles and the firing chamber that enters this cylinder after the air inlet of this throttle valve body mixes.

The present invention is owing to adopt miniature pumping fuel injection, when therefore it operates, can draw fuel oil by the driving force at the Micropump Pu of injection unit itself, and do not need other pressurization fuel oil, therefore make the outside oil feed line of fuel system of the present invention can reach lasting supply fuel oil by the pressure that alternate position spike caused of fuel tank, therefore make that the loine pressure of oil supply system of the present invention is considerably low, and the crackly danger of the high-pressure oil pipe that can avoid fuel injection system, and the Security that improves fuel injection system of the present invention significantly.

Moreover, the structure of the injection unit that the present invention uses is quite simple, can adopt the compatible processing procedure of semiconductor to be made again, and it must not use pressurization device and complex mechanical construction again, therefore make whole cost of the present invention far below traditional Carburetor and injected fuel feeding mechanism.And the present invention is by the technology of miniature pumping, the particle that fuel oil can be ejected is controlled at quite small size, and can accurately control fuel injection amount, therefore make fuel injection system of the present invention can make effectively that fuel oil and air inlet atomize fully, and accurately control oil inlet quantity, therefore reach and promote engine combustion efficient.

Simultaneously, the present invention can be more further by the special position that injection unit is arranged on the engine throttle valve body with specific array shape arrangement, again by the control of control circuit, when making each engine air admittance, can from the injection unit of diverse location the fuel injection be entered into the special position of throttle valve gas-entered passageway by control, and make throttle valve specific during than the large throttle aperture, the location of intake manifold can form the effect that gas concentration is layered arrangement, and obtain the situation of stratified charge, to obtain the effect of thin oil burning.

Below in conjunction with drawings and Examples the present invention is elaborated.

The drawing explanation:

Fig. 1 is the unitary construction schematic representation of micropulsated fuel oil jetting system of the present invention.

Organigram after amplify in the front of the injection unit that Fig. 2 uses for the present invention.

Fig. 3 is a pilot signal schematic representation of the present invention.

Fig. 4 is the organigram of second embodiment of the invention.

Fig. 5 is the organigram of third embodiment of the invention.

Fig. 6 is the organigram of the traditional miniature pumping of thermal bubble type.

Fig. 7 is the organigram of the traditional miniature pumping of piezoelectricity type.

Fig. 8 is the organigram of traditional carburetor fuel supply system.

Fig. 9 is the organigram of traditional injected fuel supply system. figure numbers illustrate that empty chamber 4A piezoelectric 10 injection units 11 micro-pumpings 12 nozzles 20 cylinders 30 throttlings of 1 substrate, 2 polysilicon floor, 3 dry film, 5 nozzle plates, 6 spray orifices, 7 plain conductors, 8 insulating barriers, the 9 insulating barrier 1A substrate 1A diaphragm 3A of 4 jet chambers cut down body 31 air intake ducts 32 mount pads 33 and cut down 70 throttlings of door 40 control device 41 drive units 50 oil drums 51 pipelines 60 carburetors 61 spindles and cut down body 71 inlet manifold 80 petrolifts 81 atomizers

As shown in Figure 1, micropulsated fuel oil jetting system of the present invention mainly comprises: some injection units 10, be with the specific array shape be installed on a cylinder 20 throttle valve body 30 on; And a control gear 40, in order to control the start of these some injection units 10: an and oil drum 50 be in order to storing fuel oil, and several is transported to fuel the pipeline 51 of these some injection units 10 from oil drum 50.

Wherein throttle valve body 30 is arranged on the intake manifold of cylinder 20, it has an intake duct 31, be to be connected with an air-strainer, enter in the firing chamber of this cylinder 20 via this intake duct 31 for air-flow, an and valve 33, for being arranged among this intake duct 31, enter the flow of the air-flow of this cylinder 20 in order to control.

Each injection unit 10 is provided with most Micropump Pus 11 as shown in Figure 2, and has a spray orifice 12 on each Micropump Pu 11 respectively, and forms a nozzle array.This some Micropumps Pu 11 is to adopt thermal bubble type Micropump Pu, also can adopt the Micropump Pu of piezoelectricity type.This injection unit 10 is by these control gear 40 its actions of control, this control gear 40 has most sensors, can detect rotating speed, the temperature of engine, the data such as position of throttle 33, then after the central processing unit (CPU) computing via control gear 40, send a pilot signal again, the Micropump Pu 11 that drives these some spray bodies unit 10 via a drive unit 41 cooperates and produces the fuel-injected action the specific opportunity of engine runnings.

As shown in Figure 3, be the pilot signal figure of injection unit 10 of the present invention, wherein signal A represents the sequential of engine running, when in each stroke of engine running or the special position in each actuating length, all can produce a running signal A.And control gear 40 is according to this signal A and after receiving the data information that other sensors collected, after calculation process, send the signal B that starts injection unit 10, this signal B passes to this drive unit 41, this drive unit 41 produces a series of impulsive motion signal C again, and the Micropump Pu 11 that drives this injection unit 10 produces injection action.This impulsive motion signal C has fixing frequency, therefore can drive this injection unit 10 and produce action with fixing frequency.

And be the time span that depends on this signal B the action time of this signal C, therefore what of oil masses this control gear 40 can spray by the length control Micropump Pu 11 of the signal B that it sent, when this control gear 40 sends signal B, this injection unit 10 produces the fuel-injected action for the frequency that can fix, enters into throttle valve body 30 and fuel oil launched.The present invention is because throttle valve is provided with a group or more injection unit 10, so the present invention can select the fuel feeding wherein from a plurality of injection units 10.And as the present invention during from different injection units 10 fuel feeding, because each injection unit 10 device is at the diverse location of throttle valve body intake duct, therefore can reach from the purpose of throttle valve intake duct diverse location injected fuel, and make when fuel oil enters into the firing chamber of cylinder along with the air inlet of engine, can produce the denseer situation of the gas concentration of regional area in the firing chamber, therefore can reach so-called stratiform fuel feeding thin oil firing effect, and the combustion efficiency of lifting engine, and lower pollution and oil consumption.

Aforesaid injection unit 10 is owing to have the spout of most small miniature pumpings, therefore make the particle of the fuel oil that it ejected can be considerably little, inertia is also less, and the speed of the fuel particles that it sprayed also comparatively slowly (speed that generally is about 5 metre per second (m/s)s), therefore make the suction tude that can be suspended in throttle valve body after the fuel particles ejection easily in, and can not accumulate on the tube wall of throttle valve intake duct, therefore can improve the common wet wall of traditional Carburetor and injected fuel system and the phenomenon of atomization badness effectively.

And, because the running situation quite stable of miniature pumping, it can accurately control the emitted dose of fuel oil, therefore makes fuel injection system of the present invention can quite accurately control suitable oil mass and enters into cylinder, therefore can promote the combustion efficiency of engine fuel.

Aforesaid injection unit 10 is because it can be by drawing fuel oil for the energy of pumping 11, and with fuel spraying, therefore the supply of its fuel oil can be by the high and low position difference of oil drum 50 and throttling mesosome 30 with fuel delivery to injection unit 10, need not use the fuel oil pumping to add pressure oil, therefore make fuel injection system of the present invention in collision happens, and make when fuel pipe breaks, can not make the fuel oil ejection atomize because of the pressure of pipeline yet, therefore can avoid the danger of fuel-oil atmozation after-explosion burning, and the Security that improves fuel injection system of the present invention significantly.

Among the embodiment shown in Figure 1, be with injection unit 10 with the annular arrangement device on the tube wall of the intake duct 31 of throttle valve body 30 front ends, and with fuel oil to spray towards the direction at intake duct 31 centers, yet the mounting type of injection unit 10 in fact of the present invention has sizable elasticity, for example this injection unit 10 can be installed on different arrangement modes throttle valve body 30 on, and it is except the intake duct 31 that can be installed in throttle valve body 30 front ends, on the back segment that more can as illustrated in fig. 4 injection unit 10 be installed in throttle valve body 30 and the pipeline that cylinder is connected: perhaps embodiment as shown in Figure 4, fitting seat 32 in interior arrangement one taper of throttle valve body 30 intake ducts 31, and with these some injection units 10 devices in the outside of fitting seat 32, and make that these some injection units 10 can be with the direction injected fuel of outwards spraying from intake duct 31 centers.Generally speaking, this injection unit 10 is the gas with various power setting that can cooperate the engine air admittance pipeline, and controls effects in order to reach different burnings, and device is in different positions.

Claims (12)

1, a kind of micropulsated fuel oil jetting system, comprising:

One throttle valve body for being installed on the admission line of an internal combustion engine cylinder, enters the flow of this firing chamber in order to the control air; One or more oil pipe is in order to the supply fuel oil; It is characterized in that: one or more injection unit, for being installed on this throttle valve body, respectively this injection unit system is connected with aforementioned oil pipe, and it has most Micropump Pus respectively, it can be sprayed aforementioned tubing conveyed fuel oil by the action at this some Micropumps Pu and enter in the admission line of this throttle valve body with particulate, and makes fuel particles and the firing chamber that enters this cylinder after the air inlet of this throttle valve body mixes.

2, micropulsated fuel oil jetting system according to claim 1, wherein the Micropump Pu of this injection unit is thermal bubble type Micropump Pu.

3, micropulsated fuel oil jetting system according to claim 1, wherein the Micropump Pu of this injection unit is piezoelectricity type Micropump Pu.

4, micropulsated fuel oil jetting system according to claim 1, wherein further comprise a control gear, this control gear can be detected the operating parameters of this internal combustion engine, and with after this several parameters computing, controls the action that these some injection units produce injected fuel.

5, micropulsated fuel oil jetting system according to claim 1, wherein this some injection units system is installed on the outside of the admission line of this throttle valve, and towards the central direction injected fuel of this admission line.

6, micropulsated fuel oil jetting system according to claim 1, wherein these some injection units are installed on a fitting seat that is arranged on the admission line center of this Rectifier plate, and from the central authorities of this admission line injected fuel toward the outer side.

7, micropulsated fuel oil jetting system according to claim 1, wherein these some injection units are installed on the leading portion pipeline of the admission line of this throttle valve.

8, micropulsated fuel oil jetting system according to claim 1, wherein these some injection units are installed on this throttle valve and the pipeline that this cylinder is connected.

9, a kind of micropulsated fuel oil jetting system, it is characterized in that comprising one or more injection unit, on the tube wall that is installed on admission line, this injection unit has one or more Micropump Pu, it can draw fuel oil by this Micropump Pu, and the fuel oil molecule launched enter in this throttle valve body, make fuel oil be suspended in the air inlet of throttle valve body, and enter into the cylinder of this internal combustion engine along with this air-flow.

10, micropulsated fuel oil jetting system according to claim 1, wherein this injection unit system is arranged on this throttle valve body with annular arrangement.

11, micropulsated fuel oil jetting system according to claim 1, wherein this injection unit system produces a succession of signal with a drive unit and drives most Micropumps Pu oil spout on the injection unit.

12, micropulsated fuel oil jetting system according to claim 1, wherein this injection unit is installed on the pipeline that the back segment cylinder of throttling zoarium connects.

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