CN1434199A - Gas fuel supply device for engine - Google Patents
Gas fuel supply device for engine Download PDFInfo
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- CN1434199A CN1434199A CN03101777A CN03101777A CN1434199A CN 1434199 A CN1434199 A CN 1434199A CN 03101777 A CN03101777 A CN 03101777A CN 03101777 A CN03101777 A CN 03101777A CN 1434199 A CN1434199 A CN 1434199A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
The present invention provides a gas fuel feeding device for an engine which controls a fuel-gas flow rate with a sufficient precision and improves the controllability of an air/fuel ratio. In this gas fuel feeding device for an engine 1, a gas fuel path 7 is connected at an upstream side from a throttle valve 20 of an intake passage 4 connected with an engine 1, the gas fuel path 7 is connected with a gas fuel supply source 10 through a regulator for gas pressure adjustment, a bleeding air path 11 is connected in the middle of the gas fuel path 7, and an air-bleed control valve 12 controlling the area of the bleeding air path 11 is provided. The interval of the gas fuel path 7 from a junction T1 of a regulator outlet to a junction T2 of a bleeding air path is set shorter than that from the junction T2 of the bleeding air path to a junction T3 of the intake passage.
Description
Technical field
The present invention relates to gas-fuel feeder that liquefied petroleum gas (LPG) (LPG), compressed natural gas gaseous fuel supply engines such as (CNG) are used.
Background technique
The gas-fuel feeder that gas engine adopted in the past as shown in figure 14, is the device that has the venturi type mixer, and this mixer has following formation.The inlet air pathway 31 that main gaseous fuel path 34 ' be connected to is linked to each other with motor ' closure 32 ' upstream side fixedly venturi portion 33 ' on, this main gaseous fuel path 34 ' the way in be equipped with stepper motor 35 ' gas driving flow rate regulating valve 36 '.In addition, above-mentioned closure 32 ' the downstream side near be equipped with gas ejector 37 '.
Under the situation of said fixing venturi type (Wen) mixer, venturi portion 33 ' internal diameter (passage diameters) be subjected to gas ejector 37 ' the restriction of Flow characteristics, degrees of freedom is smaller.Therefore, for corresponding to large-duty engine, high output motor, when enlarging the venturi diameter, need a plurality of spargers, the result has brought the problem of the expense of raising.
In addition, be to carrying out air fuel ratio control from the main system of main venturi fueling with from these two systems of deceleration system of gas ejector fueling, and this control system complexity, this point also can cause raising of expense.
Given this, the applicant once had motion, this motion be about a kind of not gas ejector just can simplified structure, reduce cost and be applicable to the gas-fuel feeder to large-duty engine from small displacement engine, this gas-fuel feeder has following structure (PCT/JP01/08988).
In other words, main gaseous fuel path is connected the closure upstream side of the inlet air pathway that links to each other with motor, on this gaseous fuel path, be connected with the right hopper of gas with regulator by the gas pressure adjustment, further, be connected with the introducing air flue on this gaseous fuel path, the air that is equipped with the area of passage that is used to control this introducing air flue is introduced control valve.
The gas-fuel feeder of above-mentioned motion, to roughly be adjusted into barometric pressure from the pressurized fuel gas in above-mentioned gas fuel supply source with above-mentioned regulator, attract gaseous fuel by means of the air-intake negative-pressure on the gaseous fuel path tie point that acts on inlet air pathway, guarantee necessary fuel quantity, simultaneously, introduce control valve control exhausting air amount with air, the error of the air fuel ratio of adjusting the distance set condition is carried out revisal, carries out air fuel ratio control with higher precision.
Thus, the gas-fuel feeder relevant with above-mentioned motion, on the basis that must guarantee fuel flow rate, also must make near the air-intake negative-pressure P1 and near the proportional relation of negative pressure P2 of above-mentioned regulator outlet of gaseous fuel path tie point of inlet air pathway, but, experimental result shows, compare to the distance of above-mentioned introducing air flue tie point with origination point from the above-mentioned air-intake negative-pressure P1 of above-mentioned inlet air pathway, introduce the air flue tie point under near the big situation of the distance the above-mentioned regulator outlet at this, near above-mentioned air-intake negative-pressure P1 and the outlet of above-mentioned regulator negative pressure P2 is not necessarily proportional, because of the reason of engine speed, might have various values.Like this, just can not guarantee the desired fuel flow rate of inlet air pathway, in order to keep air fuel ratio is set condition, and the target aperture that also will make air introduce control valve has big change, yet, originally, introducing control valve owing to air is for the delicate error of revisal air fuel ratio apart from set condition is provided with, so when above-mentioned target aperture changed news and tells, driving just can not be followed the tracks of with stepper motor etc., as a result, impair the control performance of air fuel ratio.
Summary of the invention
The present invention In view of the foregoing proposes, and its objective is, provide a kind of can be with the High Accuracy Control gas fuel flow rate, can improve the engine gas supplier of the control performance of air fuel ratio.
The invention of scheme 1, in the gas-fuel feeder of motor, closure upstream side at the inlet air pathway that links to each other with motor is connected with the gaseous fuel path, this gaseous fuel path is connected on the gaseous fuel supply source with regulator by the gas pressure adjustment, in the way of this gaseous fuel path, be connected with the introducing air flue, simultaneously, be provided with the air introducing control valve that is used to control this introducing air flue area, it is characterized in that, the regulator outlet tie point of above-mentioned gas fuel passage is set for less than this introducing air flue tie point to the distance that connects to the tie point of above-mentioned inlet air pathway to the distance of above-mentioned introducing air flue tie point.
Therefore, in the present invention, the regulator outlet tie point of above-mentioned gas fuel passage is introduced the air flue tie point to the distance that connects to the tie point of above-mentioned inlet air pathway to the distance setting one-tenth of above-mentioned introducing air flue tie point less than this, in other words, this means at the regulator outlet tie point of determining the gaseous fuel path under the situation of the distance of inlet air pathway tie point, owing to make regulator outlet tie point as much as possible and introduce the air tie point approaching.
The invention of scheme 2, in scheme 1, be provided with premixing cavity in the downstream side of the above-mentioned introducing air flue tie point of above-mentioned gas fuel passage, this premixing cavity can relax the propagation of the charge pulsation that motor produces, simultaneously, promote gaseous fuel and introduce Air mixing.
The invention of scheme 3, in scheme 1 or 2, it is characterized in that be provided with the gaseous fuel control valve that opens and closes ground control inlet air pathway at the upstream side of the above-mentioned gas fuel passage tie point of above-mentioned inlet air pathway, the aperture of this gaseous fuel control valve changes according to the operating condition of motor.
The invention of scheme 4 in scheme 3, is characterized in that, the above-mentioned gas fuel control valve is connected by linkage mechanism with above-mentioned closure, makes before this WOT above-mentioned gas fuel control valve standard-sized sheet.
The invention of scheme 5, in scheme 1 or 2, it is characterized in that, above-mentioned closure upstream side at above-mentioned inlet air pathway is equipped with the fixedly venturi portion that is used to dwindle the inlet air pathway area, fixedly venturi portion has the annulus of the total pore of band shape, have a plurality of slits or a plurality of aperture that this total pore is communicated with above-mentioned inlet air pathway, the above-mentioned gas fuel passage is communicated with above-mentioned total pore.
According to the invention of scheme 1, because the regulator of above-mentioned gas fuel passage outlet tie point is set for less than this introducing air flue tie point to the distance that connects to the tie point of above-mentioned inlet air pathway to the distance of above-mentioned introducing air flue tie point.In other words, should make gaseous fuel path adjuster outlet tie point approaching as much as possible with introducing air tie point.Therefore, can improve the controlled of gas fuel flow rate or air fuel ratio.That is to say, because regulator outlet tie point is approaching with introducing air tie point, so both air-intake negative-pressures about equally.In addition, even under the situation of engine speed change, also can the company of assurance export the proportionate relationship of the air-intake negative-pressure of tie point, thereby guarantee necessary fuel flow rate to the air-intake negative-pressure and the regulator of the gaseous fuel path tie point of inlet air pathway.And then, do not need to change the target aperture that air is introduced control valve significantly, just can make the fully variations of tracking target aperture such as stepper motor, the result can guarantee the controlled of air fuel ratio.
Invention according to scheme 2, because the downstream side at the above-mentioned introducing air flue tie point of above-mentioned gas fuel passage is provided with the premixing cavity with big volume, therefore, can relax the charge pulsation that starts pusher side to produce and introduce the propagation of control valve side to regulator or air, can prevent that charge pulsation from causing with the resonance phenomenon that constitutes the barrier film eigentone of underpressure chamber in the regulator, thereby avoid to supply with needed fuel, simultaneously, before inlet air pathway, just can promote gaseous fuel and introduce the Air mixing result, further guaranteed gas fuel flow rate, also improved the control performance of air fuel ratio with highi degree of accuracy.
According to the invention of scheme 3, owing to be provided with gaseous fuel control valve at the upstream side of above-mentioned gas fuel passage tie point, the aperture of this gaseous fuel control valve changes according to the operating condition of motor.So, may command acts on the air-intake negative-pressure on the gaseous fuel path tie point, for example, in the little operation range of the aperture of closure, diminish by the aperture that makes gaseous fuel control valve, can produce air-intake negative-pressure at gaseous fuel path tie point, can control fuel flow rate reliably by means of this air-intake negative-pressure.
Therefore, main venturi can be set, when adopting this structure, can eliminate the restriction loss of the suction air quantity that main venturi causes, increase and suck air quantity, obtain high output.
According to the invention of scheme 4,, made before this WOT above-mentioned gas fuel control valve standard-sized sheet because the above-mentioned gas fuel control valve is connected by linkage mechanism with above-mentioned closure.Therefore, become big middle and high pressure load operation zone at throttle opening, gaseous fuel control valve elder generation standard-sized sheet has further avoided becoming the resistance that sucks air reliably.
Invention according to scheme 5, because the above-mentioned closure upstream side at above-mentioned inlet air pathway is equipped with fixedly venturi, fixedly venturi has a plurality of slits or a plurality of aperture that the total pore of the ring-type of making is communicated with above-mentioned inlet air pathway, therefore, gaseous fuel can be supplied with inlet air pathway equably, reliably mixed fuel and air.
Brief description of drawings
Fig. 1 is the pattern pie graph about the gas-fuel feeder of first form of implementation of the invention of scheme 1～4.
Fig. 2 is the pattern pie graph of the mixer part of above-mentioned form of implementation.
Fig. 3 is the performance plot of the relevance of expression throttle opening of above-mentioned form of implementation and gaseous fuel control valve aperture.
Fig. 4 is the cross-section side view that the air of the above-mentioned form of implementation of expression is introduced control valve and premixing cavity.
Fig. 5 is the plan view that the air of the above-mentioned form of implementation of expression is introduced control valve and premixing cavity.
Fig. 6 is the plan view that the air of the above-mentioned form of implementation of expression is introduced control valve and premixing cavity.
Fig. 7 is the section plan view of the regulator of above-mentioned form of implementation.
Fig. 8 is the section plan view of the regulator of above-mentioned form of implementation.
Fig. 9 is the ground plan of the regulator of above-mentioned form of implementation.
Figure 10 is three valve bodies section plan view partly of the regulator of above-mentioned form of implementation.
Figure 11 is the ground plan of secondary underpressure chamber of the regulator of above-mentioned form of implementation.
Figure 12 is the cross-section side view about the fixedly venturi of second form of implementation of the invention of scheme 5.
Figure 13 is the cross-section side view of fixedly venturi of the variation of above-mentioned second form of implementation.
Figure 14 is the pattern pie graph of gas-fuel feeder in the past.
The explanation of symbol among the figure
The 1st, motor, the 4th, inlet air pathway, the 7th, the gaseous fuel path, the 8th, premixing cavity, the 9th, regulator, the 10th, the right hopper of gas (supply source), the 11st, introduce air flue, the 12nd, air is introduced control valve, the 20th, closure, the 21st, gaseous fuel control valve, the 22nd, linkage mechanism, 44, the 46th, fixing venturi, 44a, 46a are total pores, 44b is an aperture, 46b is the slit, T1 is a regulator outlet tie point, and T2 introduces air (Block リ one De エ ア) path tie point, and T3 is the tie point of inlet air pathway.
The working of an invention form
Below, with reference to description of drawings form of implementation of the present invention.
Fig. 1～Figure 11 is the explanatory drawing of a form of implementation of the present invention, Fig. 1 is the pattern pie graph of the engine gas supplier of this form of implementation, Fig. 2 is the pattern pie graph of mixer part, Fig. 3 is the performance plot of the relevance of throttle opening and gaseous fuel control valve aperture, Fig. 4～Fig. 6 is schematic representation, cross-section side view, plan view, the plan view that air is introduced control valve and premixing cavity, and Fig. 7～Figure 11 is the schematic representation of regulator.
Among the figure, the 1st, with gaseous fuel for example, the gas engine of compressed natural gas (CNG) running, this gas engine links together with piston 1b and the bent axle 1d that connecting rod 1c will be configured in the 1a of cylinder hole with being free to slide, and drives relief opening 1e and suction port 1f respectively with outlet valve 1g, suction valve 1h with opening and closing.In the figure of the exhaust passageway 2 that is communicated with above-mentioned relief opening 1e, be provided with catalyst 3.In addition, 2a is a baffler.
In the way of the inlet air pathway 4 that is communicated with above-mentioned suction port 1f, be provided with gas mixer 5, be connected with air-strainer 6 at the upstream extremity of this inlet air pathway 4.The gaseous fuel path 7 of above-mentioned gas mixer 5 is connected with the right hopper 10 of gas by premixing cavity 8, regulator 9.In addition, be connected with at above-mentioned premixing cavity 8 upstream sides of gaseous fuel path 7 and introduce air flue 11, on this introducings air flue 11, be equipped with air and introduce control valve 12, be connected with air-strainer 13 at the upstream extremity of this air introducing control valve 12.In addition, the 45th, the gas leakage current return circuit that allows gas leakage flow through inlet air pathway 4,45a are the pressure controlled valves of opening when the pressure in this path 45 arrives setting pressure.
Here, in this form of implementation, with the regulator 9 outlet tie point T1 of above-mentioned gas fuel passage 7 to the tie point T2 of above-mentioned introducing air flue 11 along the path instrumentation time the distance setting tie point T2 that becomes to be shorter than this introducing air flue 11 to company to the tie point T3 of above-mentioned inlet air pathway 4 along the path instrumentation time distance.In other words, determining from regulator outlet tie point T1 under the situation of the distance of inlet air pathway tie point T3, should make the tie point T2 of the outlet tie point T1 of above-mentioned regulator 9 and above-mentioned introducing air flue 11 approaching as much as possible.Whereby, can improve the controlled of gas fuel flow rate described later or air fuel ratio.
Downstream side at the gas mixer 5 of above-mentioned inlet air pathway 4 is equipped with the B/P EGR Back Pressure Transducer EGR 14 that is used to detect air-intake negative-pressure, is equipped with at catalyst 3 upstream sides of exhaust passageway 2 to be used for detecting the O that discharges gas
2The O of concentration
2Sensor 15 in addition, is equipped with the temperature transducer 16 that is used to detect this catalyst temperature on above-mentioned catalyst 3.By these sensors 14,15 and 16 air-intake negative-pressure signal a, the O that detect
2Concentration signal b and temperature signal c apparatus for controlling of supply 17.Then, introduce control valve 12 delivery airs to above-mentioned air respectively from this control gear 17 and introduce control signal S1, to ISC (idle speed control) valve 18 output idle speed control signal S2.
Above-mentioned mixer 5 has: diameter is less than the fixed main venturi of the solar term of inlet air pathway 4 portion 19; Be provided in the bultterflythrottle 20 of may command inlet air pathway area of downstream side, the upstream side of this main venturi portion 19; And gaseous fuel control valve 21.Above-mentioned gas fuel passage 7 is opened on the above-mentioned main venturi portion 19 of the upstream side that is positioned at closure 20, the tie point T3 that this opening connects to inlet air pathway as gaseous fuel path 7.
Drive pulley not shown in the figures is equipped with in an end at the valve shaft 20a of above-mentioned closure 20.This drive pulley is connected with the solar term pedal of driver's seat by the solar term cable, and above-mentioned closure 20 rotates according to driver's the pedal amount of depressing.
The valve shaft 20a of above-mentioned closure 20 is connected by linkage mechanism 22 with the valve shaft 21a of above-mentioned fuel control valve 21.Specifically, can not be connected with throttle arm 22a in another outer end of the valve shaft 20a of closure 20, this throttle arm 22a is connected on the control arm 22c of fuel control valve 21 by connecting rod 22b with relatively rotating.
Above-mentioned fuel control valve 21 contacts with backstopping assembly in the position of opening fully, and the above-mentioned control arm 22c valve shaft 21a of this fuel control valve 21 is relatively connecting rotationally, and rotates the application of force along counter-clockwise sense of rotation towards minimum aperture position by force application spring.Above-mentioned throttle arm 22a makes the structure of length greater than above-mentioned control arm 22c.
Therefore, before closure 20 standard-sized sheets, fuel control valve 21 is in full-gear, in addition, after these fuel control valve 21 standard-sized sheets, the connecting rod 22b rotation that control arm 22c follows the tracks of closure 20 and is attached thereto.
Here, under the state that does not depress the solar term pedal, closure 20 and fuel control valve 21 remain under the minimum aperture shown in Figure 2.The amount of depressing of the aperture of this closure 20 and solar term pedal roughly increases pro rata.On the other hand, the standard-sized sheet when aperture of gaseous fuel control valve 21 is approximately 20～30% degree in the aperture of closure 20 afterwards, remains on fully open position (with reference to the characteristic curve A of Fig. 3).
In addition, also can remove main venturi portion 19 from above-mentioned inlet air pathway 4.In this case, shown in the characteristic curve B of Fig. 3, gaseous fuel control valve 21 does not have standard-sized sheet, and maximum reaches 40～50%.Therefore, if main venturi is not set, can not produce air-intake negative-pressure at gaseous fuel path joint yet.
As Fig. 4～shown in Figure 6, above-mentioned air is introduced control valve 12 and premixing cavity 8 becoming one.Air is introduced control valve 12 and is made valve body 12b advance and retreat by stepper motor 12c, and then adjusts the area of passage of introducing formed air introducing hole 11a on the air flue 11, and above-mentioned valve body 12b has the coniform valve 12a of portion.When the area of passage of air introducing hole 11a became big, the intake of air (outer gas) increased, and the intake of gaseous fuel relatively reduces, thereby the error of the set condition of the relative gas fuel flow rate of revisal simultaneously, controls to desired value with air fuel ratio.
On the air introducing hole 11a of above-mentioned introducing air flue 11, be equipped with above-mentioned air-strainer 13 with swimming the side face-off from it.This air-strainer 13 disposes ring-shaped member 13b in being roughly the housing 13a of rectangle, the air that imports from inlet 13c enters central side by the periphery of parts 13b, introduces hole 11a to above-mentioned air and flows.
Side room, the downstream 11b of the air introducing hole 11a of above-mentioned introducing air flue 11 is opened on the input side joint 7a of a part that constitutes gaseous fuel path 7, and therefore, side room, downstream 11b is above-mentioned introducing air flue tie point T2.In addition, the downstream 7b of above-mentioned input side joint 7a is communicated with above-mentioned premixing cavity 8.What this premixing cavity 8 was two sides openings by diapire 8a, roof 8b sealing is cylindric, and be configured to the axis of above-mentioned input side joint 7a rectangular, i.e. configuration flatly.In addition, above-mentioned premixing cavity 8 has sufficient volume, and above-mentioned gas fuel is mixed with the introducing air full and uniformly.And, can avoid from the charge pulsation of motor from this premixing cavity 8 upstream side propagate.
Formed outlet 8c is connected with the outlet side joint 23 of a part that constitutes gaseous fuel path 7 on the roof 8b of above-mentioned premixing cavity 8, valve chest 23a and external connecting pipe 23b that this outlet side joint 23 will constitute the part of diaphragm type fuel shut off valve 24 are made of one, and above-mentioned valve chest 23a is vertical with external connecting pipe 23b.This external connecting pipe 23b is connected with the venturi portion 19 of above-mentioned inlet air pathway 4 by the fuel hose of the part of formation gaseous fuel path 7.
The valve opening 23c of above-mentioned valve chest 23a is opened on above-mentioned premixing cavity 8, sets the valve plate 24a of the above-mentioned fuel shut off valve 24 that can open and close this valve opening 23c on this valve opening 23c.The structure of this fuel shut off valve 24 is that at the fixing above-mentioned valve plate 24a in the tip of valve shaft 24d, this valve shaft 24d is fixed on the membrane valve 24c that is set in the barrier film housing 24b.
Above-mentioned membrane valve 24c gives above-mentioned valve plate 24a towards opening the direction application of force by Returnning spring 24e.The 24f of negative pressure chamber that is surrounded by barrier film housing 24b and membrane valve 24c is connected with the negative pressure feeding mouth 26a of three-way solenoid valve 26 by negative pressure importing path 25.This three-way solenoid valve 26 has negative pressure introducing port 26b, imports atmospheric atmosphere introducing port 26c and above-mentioned negative pressure feeding mouth 26a by filter 27, and above-mentioned negative pressure introducing port 26b negative pressure imports flexible pipe and is communicated with the downstream side of the closure 20 of inlet air pathway 4.
Fuel cut-off when carrying out the deceleration of above-mentioned fuel shut off valve 24 by three-way solenoid valve 26 by above-mentioned control gear 17.During anxious the deceleration, that is to say, under closure 20 with idling aperture, engine speed is situation more than the deceleration fuel cutoff rotating speed that presets, three-way solenoid valve 26 switches, above-mentioned negative pressure introducing port 26b is communicated with above-mentioned negative pressure feeding mouth 26a, afterwards, air-intake negative-pressure is imported the 24f of negative pressure chamber of fuel shut off valve 24, cut off above-mentioned valve opening 23c.On the other hand, above-mentioned three-way solenoid valve 26 switches when removing above-mentioned anxious deceleration regime, above-mentioned atmosphere introducing port 26c is communicated with above-mentioned negative pressure feeding mouth 26a, whereby, barometric pressure is imported the 24f of negative pressure chamber of fuel shut off valve 24, open this fuel shut off valve 24 by Returnning spring 24e.
On the external connecting pipe 7c of the upstream extremity of above-mentioned input side joint 7a, the joint of the part by constituting the gaseous fuel path etc. is connected with above-mentioned regulator 9.This regulator 9 is to have once～the diaphragm type structure of three underpressure chamber #1～#3, with the gas pressure in the right hopper 10 of above-mentioned gas with 3 stage decompressions to being roughly barometric pressure, and have following concrete formation.
The housing 28 of above-mentioned regulator 9 have with three times of three underpressure chamber # 3 decompression housing 28a and have once, secondary underpressure chamber #1, #2 once, secondary decompression housing 29.By this once, the last side opening of a chamber 29a cutting apart of the boundary wall 29d of secondary decompression housing 29 is by chamber cap 31 switchings, clamping barrier film 30 once between this chamber 29a and the chamber cap 31.The open lower side of the 29b of secondary chamber that above-mentioned boundary wall 29d is cut apart is opened and closed by secondary chamber cap 32, and clamping has secondary barrier film 33 between 29b of this secondary chamber and the secondary chamber cap 32.
Be connected with the valve shaft 34a that links to each other with valve body 34 in the lower end of a bar 30a who is fixed in an above-mentioned barrier film 30.By moving of an above-mentioned barrier film 30, the supporting arm 34b that is fixed on the above-mentioned valve shaft 34a is that center of rotation is rotated with pin 34c, and an above-mentioned valve body 34 is moved along the left and right directions of Fig. 8 a little, and therefore, the valve opening 35a that makes gas import joint 35 opens and closes.In addition, an above-mentioned barrier film 30 by Returnning spring 30b towards the below application of force, whereby, to an above-mentioned valve body 34 all the time towards opening the direction application of force.In addition, the Returnning spring 30b side of a barrier film 30 imports barometric pressure all the time by through hole 31a.Above-mentioned gas imports joint 35 and is connected communicatively with the right hopper 10 of above-mentioned gas.
An above-mentioned underpressure chamber #1 is communicated with above-mentioned secondary underpressure chamber #2 by means of the intercommunicating pore 29c that forms on above-mentioned boundary wall 29d, and this intercommunicating pore 29c is opened and closed by secondary valve body 36.The arm 36a that the one end is fixed on this secondary valve body 36 can be that rotate at the center with pin 36b, and whereby, secondary valve body 36 opens and closes intercommunicating pore 29c.
The other end of above-mentioned arm 36a is connected rotationally with secondary bar 33a on being fixed to secondary barrier film 33.The lower end surface of this secondary bar 33a and an end 37a of torsion bar type Returnning spring 37 face-off contact, the other end 37b of this Returnning spring 37 by bolton be fixed to once, secondary reduces pressure on the housing 29.When this Returnning spring 37 reduces at the pressure of secondary underpressure chamber #2, make above-mentioned secondary valve body 36 turn back to the state of opening a little of Fig. 8.
Above-mentioned three decompression housing 28a have be approximately above-mentioned once, the diameter of the twice of secondary decompression housing 29, open lower side is opened and closed by side cover 39 down.This open lower side three barrier films 38 in big footpath with following side cover 39 clampings.In addition, on this time side cover 39, be formed with through hole 39a, barometric pressure imported the opposite side of three underpressure chamber # 3 of above-mentioned three barrier films 38.Form the gas outlet hole 28c that is communicated with above-mentioned three underpressure chamber # 3 outside on three decompression housing 28a, this gas outlet hole 28c is the regulator outlet tie point T1 of gaseous fuel path.This gas outlet hole 28c is communicated with the external connecting pipe 7c of above-mentioned input side joint 7a.
One end 40a of arm 40 is connected with the upper end portion of No. three bar 38a that are fixed in above-mentioned three barrier films 38.The other end of this arm 40 can advance and retreat the ground screw thread be inserted with valve body 40c three times, in addition, support by pin 40d with the part of these three valve body 40c adjacency with freely swinging.Above-mentioned three valve body 40c open and close the downstream-end opening 28d of valve opening 28b.The adjusting of the screw thread amount of being screwed into by above-mentioned three valve body 40c, can adjust silicone rubber 40e with respect to the crimp force of downstream-end opening 28d, be the initial stage seal load.In addition, the upstream-end opening 28e of above-mentioned valve opening 28b is opened on above-mentioned secondary underpressure chamber #2.
On the other end 40b of above-mentioned arm 40 by towards above be bent to form stop tab 40f, this stop tab 40f contacts with spring 41.This spring 41 inserts in the pilot hole 42a of adjustment component 42, and adjustment component 42 screw threads insert in the above-mentioned housing 28a that once reduces pressure.By adjusting the screw thread amount of being screwed into of this adjustment component 42, adjust the elastic force that turns clockwise along Fig. 7 of arm 40, whereby, load, initial stage load in the time of can adjusting three valve body 40c and begin to open.
Further, upside at above-mentioned three decompression housing 28a is equipped with solenoid type driver part 43, and the dissengaged positions of regulator 9 when being used for keeping motor to stop only can to drive when engine running, the connection of solenoid 43a, disconnection can make driveshaft 43b come in and go out.When main switch disconnected, driveshaft 43b stretched out, counterclockwise rotation of restricted arm 40, and then, above-mentioned three valve body 40c are remained closed condition.When main switch was connected, driveshaft 43b retreated, and above-mentioned arm 40 can rotate.
Below, action, effect and the effect of this form of implementation are described.
Do not enter at fuel under the state of regulator 9 inside, open valve body 34, secondary valve body 36, and close valve body 40c three times.Therefore, enter a underpressure chamber #1 decompression from high pressure (20 MPa) gaseous fuel of gas fuel tank 10 from the valve opening 35a of open mode, and entering secondary underpressure chamber #2 by intercommunicating pore 29c further reduces pressure, when in underpressure chamber #1, a secondary underpressure chamber #2, becoming setting pressure, close once, secondary valve body 34,36, thus, will remain on given decompression state in underpressure chamber #1, the secondary underpressure chamber #2.
When main switch was connected, solenoid 43a rose driveshaft 43b, and arm 40 can be shaken.During the engine rotation pto, air-intake negative-pressure affacts on three underpressure chamber # 3 of regulator 9 from gaseous fuel path tie point T3 by gaseous fuel path tie point T1, premixing cavity 8, rising by three barrier films 38, three times valve body 40c opens valve opening 28, in three underpressure chamber # 3 of gaseous fuel inflow in the #2 of secondary underpressure chamber, reducing pressure to is roughly barometric pressure, and this gaseous fuel attracts to motor from inlet air pathway 4 by gaseous fuel path 7.
When engine start begins the feedback control of air fuel ratio, at O
2Concentration signal b is under the situation of rich signal, and before becoming poor signal, above-mentioned air is introduced control valve 12 with the command speed according to suction pressure and engine speed setting, opens to specify aperture, and is opposite when replacing with poor signal, at O
2Before concentration signal b becomes poor signal, with above-mentioned same, with the command speed of setting and to specify aperture to close.
Under the situation that does not depress the solar term pedal, closure 20 and gaseous fuel control valve 21 remain under the minimum aperture shown in Figure 2, the air-intake negative-pressure that affacts on the gaseous fuel path tie point T3 diminishes, and gas fuel flow rate is and the throttle opening corresponding flow.The driver roughly increases the aperture of closure 20 and the amount of depressing of solar term pedal along with the solar term pedal depresses pro rata.On the other hand, the standard-sized sheet when aperture of gas flow control valve 21 is 20～30% degree at throttle opening afterwards, remains on fully open position (with reference to the characteristic curve A of Fig. 3).
In addition, in this form of implementation,, the regulator of above-mentioned gas fuel passage 7 outlet tie point T1 arrives even distance to the tie point T3 of above-mentioned inlet air pathway 4 because being become to be shorter than this introducings air flue tie point T2 to the distance setting of above-mentioned introducing air flue tie point T2.In other words, because regulator outlet tie point T1 and above-mentioned introducing air flue tie point T2 are approaching, therefore, improved the controlled of gas fuel flow rate or air fuel ratio.
That is to say, because regulator outlet tie point T1 is approaching with introducing air flue tie point T2, therefore both air-intake negative-pressures equate substantially, and company can be remained proportionate relationship to the air-intake negative-pressure of the gaseous fuel path tie point T3 of inlet air pathway 4 and the air-intake negative-pressure of regulator outlet tie point T1, whereby, even engine speed changes, also can guarantee necessary fuel flow rate accurately.So, owing to can guarantee necessary fuel flow rate accurately, so the target aperture that does not need to be used in the air introducing control valve 12 of guaranteeing needed air fuel ratio has big change.Can solve stepper motor etc. and can not follow the tracks of the problem of the pace of change of this target aperture, the result has improved the controlled of air fuel ratio.
In addition, because the downstream side of the introducing air flue tie point T2 of above-mentioned gas fuel passage 7 is provided with the premixing cavity 8 with big volume, so the charge pulsation that can relax the motor generation is introduced the propagation of control valve 12 sides to regulator 9 and air, can prevent that charge pulsation from causing with the resonance phenomenon that constitutes the barrier film eigentone of underpressure chamber in the regulator, thereby avoid to supply with needed fuel, simultaneously, before inlet air pathway, just can promote gaseous fuel and introduce Air mixing, this point has further been guaranteed gas fuel flow rate with highi degree of accuracy, has also improved the control performance of air fuel ratio.
Moreover, because the upstream side at the gaseous fuel path tie point T3 of inlet air pathway 4 is equipped with gaseous fuel control valve 21, its aperture changes along with the operating condition of motor, so may command acts on the air-intake negative-pressure on the gaseous fuel path tie point, for example, in the little operation range of the aperture of closure 20, diminish by the aperture that makes gaseous fuel control valve 21, can produce air-intake negative-pressure, can control fuel flow rate reliably by means of this air-intake negative-pressure at gaseous fuel path tie point T3.
Therefore, can not establish main venturi portion 19.Under the situation that main venturi portion is not set, can eliminate the restriction loss of the suction air quantity that main venturi portion produces, obtain high output.
In addition, because above-mentioned gas fuel control valve 21 is connected by linkage mechanism 22 with closure 20, so that before this closure 20 is standard-sized sheet, allow above-mentioned gas fuel control valve 21 standard-sized sheets, therefore, can realize the standard-sized sheet in advance of gaseous fuel control valve 21 with simple structure, can avoid becoming big middle and high pressure load operation zone gaseous fuel control valve 21 and become the resistance that sucks air at throttle opening.
Figure 12 shows the fixedly venturi of invention second form of implementation of scheme 5.The fixedly venturi 44 of this form of implementation is made of the tubular part that has the total pore 44a of ring-type (annulus), connects above-mentioned gaseous fuel path 7 at this total pore 44a place.Make circular-arcly in the face of the part of the inlet air pathway 4 of said fixing venturi 44, have a plurality of aperture 44b that above-mentioned total pore 44a is communicated with inlet air pathway 4.In addition, replace this a plurality of apertures, also the slit can be set.
This form of implementation, because closure 20 upstream sides at inlet air pathway 4 are provided with fixedly venturi portion 44, fixedly venturi portion 44 has a plurality of aperture 44b that the total pore 44a of ring-type is communicated with inlet air pathway 4, therefore, gaseous fuel can be supplied in the inlet air pathway 4 equably, gaseous fuel is mixed reliably with air.
Figure 13 shows the fixedly venturi of the variation of second form of implementation.Should be fixedly venturi 46 ring bodies 46c is housed in inlet air pathway 4, with both gap as the total pore of ring-type (Ha ッ ダ cave) 46a.Connect above-mentioned gaseous fuel path 7 in addition at the total pore 46a of this ring-type place.Make circular-arcly in the face of the part of the inlet air pathway 4 of said fixing venturi 46, above-mentioned total pore 46a is communicated with inlet air pathway 4 by slit 46b.In this variation, also can obtain effect and the effect same with the situation of above-mentioned Figure 12.
Claims (5)
1. the gas-fuel feeder of motor, closure upstream side at the inlet air pathway that links to each other with motor is connected with the gaseous fuel path, this gaseous fuel path is connected on the gaseous fuel supply source with regulator by the gas pressure adjustment, in the way of this gaseous fuel path, be connected with the introducing air flue, and, be provided with the air introducing control valve that is used to control this introducing air flue area, it is characterized in that, the regulator outlet tie point of described gaseous fuel path is set for less than this introducing air flue tie point to the distance that connects to the tie point of described inlet air pathway to the distance of described introducing air flue tie point.
2. according to the gas-fuel feeder of the motor of claim 1 record, it is characterized in that, downstream side at the described introducing air flue tie point of described gaseous fuel path is provided with premixing cavity, this premixing cavity can relax the propagation of the charge pulsation of motor generation, and, promote gaseous fuel and introduce Air mixing.
3. according to the gas-fuel feeder of motors of claim 1 or 2 records, it is characterized in that, upstream side at the described gaseous fuel path tie point of described inlet air pathway is provided with the gaseous fuel control valve that opens and closes ground control inlet air pathway, and the aperture of this gaseous fuel control valve changes according to the operating condition of motor.
4. according to the gas-fuel feeder of the motor of claim 3 record, it is characterized in that described gaseous fuel control valve is connected by linkage mechanism with described closure, made before this WOT described gaseous fuel control valve standard-sized sheet.
5. according to the gas-fuel feeder of motors of claim 1 or 2 records, it is characterized in that, described closure upstream side at described inlet air pathway is equipped with the fixedly venturi portion that is used to dwindle the inlet air pathway area, fixedly venturi portion has the annulus of the total pore of band shape, have and make a plurality of slits or a plurality of aperture that is communicated with in this total pore and the described inlet air pathway, described gaseous fuel path is communicated with described total pore.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13470/2002 | 2002-01-22 | ||
| JP2002013470A JP2003214260A (en) | 2002-01-22 | 2002-01-22 | Gas fuel feeding device for engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1434199A true CN1434199A (en) | 2003-08-06 |
Family
ID=27650420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN03101777A Pending CN1434199A (en) | 2002-01-22 | 2003-01-22 | Gas fuel supply device for engine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2003214260A (en) |
| CN (1) | CN1434199A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1796752B (en) * | 2004-12-20 | 2010-05-05 | 天津内燃机研究所 | Electric control engine of motorcycle of using monofuel LPG |
| CN102174916A (en) * | 2008-06-04 | 2011-09-07 | 本田技研工业株式会社 | Fuel feeding device for gas engine |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5107120B2 (en) * | 2008-04-01 | 2012-12-26 | ヤンマー株式会社 | Gas engine mixer |
| JP6042296B2 (en) * | 2013-09-09 | 2016-12-14 | 株式会社クボタ | engine |
| JP2018069743A (en) | 2015-02-26 | 2018-05-10 | ヤマハ発動機株式会社 | Drive torque control device, driving source unit, and vehicle |
| US20230235706A1 (en) * | 2022-01-24 | 2023-07-27 | Generac Power Systems, Inc. | Integrated throttle - fuel mixer |
-
2002
- 2002-01-22 JP JP2002013470A patent/JP2003214260A/en not_active Withdrawn
-
2003
- 2003-01-22 CN CN03101777A patent/CN1434199A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1796752B (en) * | 2004-12-20 | 2010-05-05 | 天津内燃机研究所 | Electric control engine of motorcycle of using monofuel LPG |
| CN102174916A (en) * | 2008-06-04 | 2011-09-07 | 本田技研工业株式会社 | Fuel feeding device for gas engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2003214260A (en) | 2003-07-30 |
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