CN85107231A - Fuel metering method and device - Google Patents

Abstract

The present invention is the fuel metering and the method for relevant engine, it utilizes a pump that continuous supply of fuel to fixed capacity chamber is provided, gas under pressure is periodically injected this chamber, be not more than fuel pressure with the pressure of keeping in this chamber, as long as gas in this chamber and supply of fuel have pressure difference to exist, fuel can flow in this chamber.One transmission mouth of this chamber is opened during gas injects this chamber, flows into the fuel of this chamber during gas injects this chamber during this indoor fuel and this section, can pass out to engine by transmitting mouth.The gas that this is indoor and the pressure difference between supply of fuel system is controlled according to the demand for fuel of engine, the fuel quantity that is transmitted with the Control Engine circulation.

Description

Fuel metering method and device

The present invention is relevant for an engine fuel method of measurement and a device, especially is applied to inject fuel directly into the fuel region person of an engine.

Once had the method for many fuel meterings to be suggested, wherein, the fuel that has measured by one under suitable pressure gas (as air) injection amount and remove in by a variable volume chambers.The injection amount of gas has significant impact for the active combustion of fuel, can improve fuel atomizing at least.

The method and apparatus of purpose of the present invention for providing an injection amount by gas to transmit the fuel that has measured, and can be effectively and accurate operation is easy to make and safeguards, and helps lend some impetus to the high atomisation of fuel.

Comprise based on the engine fuel method of measurement that these purposes provided, simultaneously with in pressure fuel supplying and gas to one chamber separately, connect this chamber and engine circularly by being carried in the engine by the fuel that comes out in the chamber by the gas stream that comes out in the chamber, according to the fuel in the load adjustment inlet chamber of engine and the pressure difference of gas, be carried to the fuel quantity of each circulation of engine with control.

Engine fuel method of measurement particularly mentioned herein comprises, and in the fixed capacity chamber that fuel supplying to is airtight under pressure continuously, gas is entered in this chamber, is not more than fuel pressure with the pressure of keeping in the chamber.And during the carrying out of gas being injected this chamber, one of this chamber transmitted mouth and opens in order to the entering of gas, therefore, when gas and fuel inject this chamber during, then carry outside at this indoor fuel by transmitting mouth.

Indoor at this, the pressure that gas produced is neither greater than fuel pressure, so even this indoorly has gas pressure to exist, fuel flows into unceasingly still that this is indoor.Usually the adjusting of fuel conveying capacity is all regulated with the difference of fuel-supplying pressure by changing in this chamber gas pressure, and or change gas enter this chamber when length regulate.

In any moment that gas injects this chamber, fuel pressure in this chamber and gas pressure poor, when the fuel transmission phase increased, the amount that fuel flows in this chamber also became greatly, can go out by transmitting oral instructions simultaneously.When gas stopped to inject this chamber, transmitting mouthful can be airtight, and fuel can continue to flow in this confined chamber, until the pressure of confined chamber is with till fuel supply pressure is identical.Therefore, inject between this chamber, at this indoor meeting accumulation one fuel quantity at each gas.The increase of the pressure difference of the gas pressure when this fuel quantity will stop to inject this chamber along with fuel pressure and gas and increasing.

Therefore, need only change above-mentioned pressure difference, promptly can regulate transmits mouth at every turn and opens the fuel quantity that is transmitted.The change of pressure difference can be by changing fuel supply pressure and or gas supply pressure and obtaining.Usually fuel all is liquid, therefore all keeps gas pressure certain with fuel metering pressure usually.

The conveying capacity of fuel also can be by when sending mouth when opening, and changes gas and inject this indoor time and change, and this time internal combustion material continues to flow to that this is indoor.

According to the demand for fuel of engine, by the change of above-mentioned pressure difference, and or change gas injection period, to obtain a fuel-metering system that is used for fuel engine.Usually fuel must be asked changes suddenly with the length that changes gas injection period and reaches.More flat peaceful variation is then reached to change the pressure difference between fuel and gas.

During transmitting mouth and opening, air and fuel enter all that this is indoor, and the fuel quantity that is transmitted is

${\mathrm{\Δ}}_{\mathrm{ml}}={\left[2d(P_f-P_m)\right]}^{\frac{1}{2}}{A}_3\mathrm{\Δ}$

Here, △ m-quality of fuel

The density of d-fuel

P _f-fuel supply pressure

P _m-at the valve closing forward pass gas pressure in this chamber when ending of making arrangements for his funeral

A ₃-fuel inlet area

△ _t-transmit the table that mouth is opened

Close and stop gas injection period when this chamber, fuel continues to send here, and the fuel quantity that accumulate in this chamber this moment is

${\mathrm{△\; m}}_2\mathrm{=\; d\; v\; 〔}\frac{P_f{\mathrm{-\; P}}_m}{P_f}{〕}^{\mathrm{1\; /\; n}}$

V-this chamber volume

N-compression index

In arbitrary single fuel cycle, the total amount of supply of fuel is

△m＝△m ₁+△m ₂

In a given metering geometric condition, fuel density △ m ₂Main relevant with the pressure difference of fuel and gas, and with arbitrary specific metering during have nothing to do and △ m ₁Then relation is all arranged with pressure difference and time.

Pressure P _mFor transmit mouthful with the gas inlet chamber in the pressure of mouth when all opening, it is subjected to the influence of each opening area, when the transmission open area reduces with respect to the ratio of the area of gas entry port, P _mIt will be gas supply pressure.

For the metering that makes fuel obtains optimum validity, opening and closing of gas entry port and fuel transmission mouth all must be synchronous, but slight asynchronous be acceptable.

Usually fuel supply pressure is controlled by a regulator, and this regulator can be responded to the demand for fuel of engine.This regulator is electric start, accepts the control of the electric current that the many engine load condition parameters by sensing are determined.

Engine fuel amount device provided by the present invention comprises a Room; In this chamber, contain a fuel openings, the transmission mouth of the gas openings of one alternative operation and an alternative operation, this measuring apparatus also comprises induction engine load and the device of the pressure difference of fuel metering and gas supply, also comprise when fuel and gas openings are all opened, open gas openings and the device that transmits mouthful selectively; With when floss hole is opened, from indoor transmission indoor and flow into indoor fuel.

Particularly, engine fuel measuring apparatus provided by the present invention comprises the confined chamber of fixed capacity, this airtight mouth comprises a fuel and transmits a mouth and a gas inlet, and the valving that optionally can open and close these openings simultaneously, with be used to can fuel supplying to go into this indoor fuel supply device under the fuel supply pressure, with all open when this two opening, this indoor gas pressure is not more than under the situation of fuel supply pressure, gas can be injected this indoor gas supply device, with in order to change when this this indoor opening is opened, and or during gas injects this chamber, the pressure difference of this indoor gas and supply of fuel, thereby regulate when the transmission mouth is opened the device of the fuel quantity that is transmitted.

Valving comprises other valve element that cooperates with each opening, and these valve elements all link together, and with single actuator operation.

According to all opening when this two opening and fuel when being transmitted, can between gas supply pressure and this indoor gas pressure, produce a pressure of being scheduled to and fall, to select the useful area of each opening.

Utilize electronic controller with during regulating that these openings open, and or the pressure of adjustments of gas and fuel room press so that control be opened the fuel quantity that is transmitted when each these openings.The engine condition that these electronic control can be detected by various sensor, such as mainfold presure and or temperature and or flow; And environment temperature; And the change rate of the arbitrary or full terms of these conditions, with the demand for fuel of response engine.

Now cooperate the embodiment of graphic method and apparatus with the present invention to be described in detail as follows, believe the present invention's purpose, feature, other advantages can get more that Qing Xi Liao separates.

Graphic simple declaration:

Figure one is the schematic representation of the specific fuel system of demonstration the present invention.

Figure two is the sectional drawing that shows batching unit.

Figure three is the gas valve in the batching unit of displayed map two and the amplification profile of associated components.

Figure four is the sectional drawing that shows fuel benchmark regulator.

Figure five is the sectional drawing that shows gas one fuel regulator.

Measuring apparatus 10 be comprise a fixed capacity and except each following opening all with chamber 11 around the atmosphere separation.The mid-length place that is connected in chamber 11 is a supply of fuel conduit 12, in order to the fuel of pilot fuel pump 14 by fuel reservoir 15 extractions.Fuel pressure in the conduit 12 of pump 14 transmission sides is controlled by fuel pressure regulator 16, and this regulator 16 will be in the more detailed description of following do.

End at measuring room 11 has a transmission mouth 20 and in the other end air inlet 21 is arranged.Utilize actuator bar 24 rigidity to link each valve element 22 and 23 and make it to do functionally to connect, these valve elements energy are moved with respect to the opening of each cooperation simultaneously with 20 and 21 of opening.

Electromagnetic valve actuator 25 contains an electromagnetic coil 26, and by the armature 27 of an axially-aligned member 28 with bar 24 connections.As shown in the figure, armature 27 is upwards pushed up by spring, with the normal position of maintaining valve gating element 22 and 23, and opening 20 and 21 is closed.By electric current that coil 26 is excitatory and armature is moved down, valve element 22 and 23 is opened opening 20 and 21.

Connect air compressor 30 and hole 32 by conduit 31, this hole 32 lies in measuring room 11 outsides and is in close proximity to opening 21 places.The air that conduit 31 and pump 30 transmit side links to each other with benchmark regulator 34.

Compressor 30 may have its air pressure regulator with the basic supply pressure of control with respect to atmospheric condition, but this function for the present invention's metering system is not an imperative, so do not do further description.In addition, when planning with dual fuel or using more easily gas source, available have the gas of Practical significance or fluid supply to replace air compressor.When replacing gas with liquid, this metering system must have some modification.

Acting as of reference pressure regulator 34 keeps certain pressure to be worse than between conduit 35 and 37.This characteristics allow in conduit 37 fuel pressure can XOR falls with the variation of air supply pressure.

These characteristics can be as following explanation.14 supplied fuel of pump can flow through conduit 38 and conduit 37.Under the situation of conduit 37, fuel passes through member 41 again by opening 40, whether produces pressure according to the control of fuel pressure regulator 16 decision and falls.The operation of this device does not conflict with present explanation, will be further described successively.

Fuel is flowed through in conduit 37 inlet chambers 48, the pressure of fuel produces a lift to barrier film 49 there, the power that is produced in the chamber of barrier film 50 opposite sides 50 internal cause air pressures with antagonism by spring 47, when the fuel-side of barrier film make a concerted effort to be increased to power greater than air side the time, opening 51 will be opened, and make fuel flow through return-flow catheter 36 in fuel reservoir 15 by chamber 48.When the pressure of chamber 48 has the trend of rising with respect to the pressure of chamber 50, all can add the displacement of macromesenterium 49, flow through the road warp with what increase opening 51, thereby rise on the fuel pressures in the prevention chamber 48.

Person as shown in the figure, if when no spring 47 exists, the pressure of barrier film both sides can equate basically.Because of spring-load allows to keep a basic pressure difference.In this example, fuel pressure is adjusted and is lower than air pressure, to determine that fuel pressure is with respect to one of air supply pressure benchmark in pressure measurement device 10.If no pressure falls when adjustment produces on 16, this pressure dependence is present in conduit 21 and 31.

The function of the regulator 16 of sequencing is to produce a pressure and be worse than between opening 40 and the conduit 37, with the relative pressure of fuel and air in the correction measuring apparatus 10.This pressure difference is the fuel pressure of opening upstream with respect to the increase of air supply pressure, makes to have a fixing relation between conduit 37 and 35.The sufficiently high pressure difference that is produced via regulator 16 will make fuel pressure in the conduit 12 greater than the air pressure in conduit 31 and empty chamber 32.

The regulator 16 of sequencing has the structure with various distinct methods operations.The suitable sequence control electronically of this device.Shown in example in, by the fuel of petrolift 14 outflows, restriction place 39 of flowing through, this restriction place only is used for limiting easily mobile, but with regard to regulator 16 and and inessential.Fuel is via overflow mechanism 41 opening 40 of flowing through.Flow the road through the size of area by changing opening 40 places, and between opening and conduit 37, set up the pressure difference of a pair of change.

The size of this variable quantity can be subjected to the influence of the pressure flow characteristics auto of pump 14 on a certain degree.The program supplying control that can easily pump characteristics be made regulator 16 does not have any influence.

Opening 40 places and his like the pathway of flowing through is balanced in power one of on the variation of area can be by member 41 and is reached.This equilibrium is the hydrodynamic pressure at opening 40 places, acts on the area of contour of opening, and perpendicular to power that member produced and utilize equilibrium between the electromagnetic force that coil 42 produced, and this electromagnetic force is center and perpendicular to member 41 with pivot 45.This pivot is also non-essential in the operation of this device, also can directly utilize electromagnetic force to act on the valve element at opening 40 places.

Utilize a permanent magnet 44 to produce electromagnetic force, via magnetic conduction road 43, and with coil 42 on the electric current interaction effect.One strength simultaneously, also produces a proportional pressure and falls along with the electric current directly proportional on the coil increases between opening 40 and conduit 37.Therefore, on coil, can produce with the proportional corresponding pressure of electric current during input current and fall, and irrelevant with the characteristic of pump 14.

Certainly, the pressure difference of 32 of many mode may command conduits 12 and empty chambers is arranged still, empty chamber links with conduit 31 again.

Wherein example system utilizes the more above-mentioned low reliable pressure difference controlling method that is controlled to be, it is for obtaining its accurate relation, and the pressure difference of 32 of measuring guide 12 and empty chambers practically, and use original adjust system with the acquisition predetermined pressure differential, and do not utilize the input current of a control gear and the relation between delivery pressure.This method that replaces it is called " closed loop " characteristic, is called " open loop " characteristic but not institute must pressure in measuring apparatus 10 in the above-mentioned system of describing.

Utilize the fuel of above-mentioned discussion to enter relation between the pressure of measuring room 11 and air supply injects opening 21 to air pressure, the metering of fuel such as following method are implemented.When the coil 26 of electromagnetic coil 25 was excitatory, armature 27 can move down, and opens valve element 22 and 23 simultaneously.At this moment, air enters measuring room, and will be originally the fuel in measuring room 11 sent by transmitting mouthfuls 20, simultaneously, can continue to flow into measuring room from the fuel of fuel line 12.This fuel can take advantage of outstanding air by measuring room 11 at once, and transmits mouthful 20 discharges by fuel.Therefore as long as electromagnetic coil 26 keeps excitatory state, fuel will continue to flow into measuring room, transmits mouth 20 via fuel again and discharges.

When coil 26 is not excitatory, by the load of spring valve element 22 and 23 is replied their closed position immediately, be located in respectively on the opening 20 and 21, stop the supply air to measuring room 11, also stop transmitting mouth 20 by fuel and sending of fuel.At this moment, having the air that some air pressures are lower than the fuel pressure in the fuel line 12 is restricted in the measuring room.Therefore fuel can continue to flow in the measuring room 11, until in the measuring room capacity of fuel will be limited to air compression in the measuring room when equating with the interior fuel pressure of fuel line 12 till.Therefore, under the pressure and the pressure balance in the measuring room 11 of this fuel line 12, fuel then stops to flow into measuring room.

When electromagnetism electric wire 26 was excitatory again, valve element 22 and 23 was moved to open position again, and air enters measuring room via opening 21, and the fuel in measuring room is sent by opening 20 places.Pressure in the measuring room is reduced to the pressure that is lower than air supply pressure at once.Fuel restarts to flow into measuring rooms via conduit 12, and person as described previously, transmit mouthfuls 20 via fuel again and discharge, until electromagnetic coil 26 is not excitatory opening 20 and 21 is closed till.

The operation of electromagnetic coil 25 is controlled by a suitable mechanism that can respond to the demand for fuel of engine, electromagnetic coil will be kept excitatory a period of time, with allow needed fuel quantity by fuel transmit mouthfuls 20 send with satisfy this section specifically during the demand for fuel of engine.The adjustment of supply of fuel can be by changing the excitatory time of electromagnetic coil, or with excitatory time of electromagnetic coil all keep certain during, and change exciting electromagnetic coil in every circulation of engine and obtain.

Except the work mat changed the control of exciting electromagnetic coil time or excitatory number of times, changes fuel pressure that still can be as described above was with respect to the supply with change fuel of the method for air pressure.Also but the combined effect of these controlling method generations of joint operation transmits the required fuel quantity of engine.

Various known control sequence according to the sensing engine condition, can set up suitable control procedure, operation with the excitatory and regulator 16 of adjusting electromagnetic coil 25, and handle these engine condition to produce electric signal, compatibly operating electromagnetic coil or similar device, and adjust the fuel quantity that is sent to engine.

See also figure two, metering contains a body 60 and electromagnetic coil unit 65 with sprayer unit 25.Body 60 has a fuel inlet 61 that is connected with fuel supply lines 12, with an air inlet 62 that is connected with air supply pipeline 31.

Body 60 has a bar portion 63, and has a central hole 66 axially to connect this bar portion 63.Chamber body 67 is connected in the lower end of bar portion 63, and an axial chamber 68 is arranged in wherein.The top of axial chamber 68 is connected with the central hole 66 of bar portion 63, and contains the air openings 69 that cooperates with Air valves.At the end of axial chamber 68 is a transmission mouth 71 that cooperates with transmission valve 72.The part between air openings 69 and transmission mouth 71 of axial chamber 68 constitutes measuring room 11.

Transmission valve 72 is linked on the operating bar 76 rigidly, and this operating bar extends through central hole 66 by electromagnetic coil unit 65 and contains axial chamber 68 to measuring room 11 is arranged.Air valves 70 is connected on the operating bar 75 non-rigidly, and as three detailed description persons of figure, operating bar 76 is that two coaxial part 76a and 76b combine at 75 places with spiral.Sleeve 77 partly is combined as a whole with the 76a of operating bar, and Air valves 70 is supported on the 76b part of operating bar slidably.Partly and in the annulus between the extension part 79 of Air valves 70 pressure spring 78 is set at 76b, the 76b of this spring and operating bar shoulder 81 partly meshes with the shoulder 82 of extension part 79.Spring 78 will normally keep the extension part 79 of Air valves 70 to withstand sleeve 77 in confined state.So structure allows that operating bar 76 does limited moving axially with respect to Air valves 70.One " 0 " shape ring seal 83 is set, to prevent escape of liquid when Air valves 70 is closed air openings 69 between Air valves 70 and operating bar 76.

According to the above-mentioned structure of describing as can be known, when operating bar 76 moves down, Air valves 70 and transmission valve 72 are moved with respect to their openings 69 and 71 separately, and opening is opened the passage that passes through as fluid.When operating bar 76 moves up, then can close opening 69 and 71.Because manufacturing tolerances, heat condition, the wearing and tearing in the work and the cause of other factors will be closed 70 and 72 and be fixed in rigidly on the operating bar 76, so as to open simultaneously or valve air openings 69 unactual with the practice of transmission mouth 71.Yet in order to obtain optimum fuel metering, the while start of these valves is needed.Elasticity as 76 of the Air valves 70 of above-mentioned description and operating bars links, and opens more slowly though can make the relative transmission valve earlier closing of Air valves, in practicality, can't reduce the accuracy of fuel metering.

When even Air valves 70 under normal closed condition, has any pressure difference to be present between the valve 70, the elastic force of spring also is enough to make Air valves 70 not to be opened, and irrelevant with moving of operating bar.

Measuring room is connected with fuel inlet 61 with passage 85 with aperture 84.The size in aperture 84 is configured to can be with the various pressure differences in person's opening, so that the known flow rate of fuel of its correspondence to be provided.

Electromagnetic coil unit 65 is housed inside in the cylindrical wall 90 into the some of body 60,, and is limited by the curved edge 93 of wall 90 with cap 91 and 92 sealings of " 0 " shape ring in the upper end of wall 90.Electromagnetic coil is accommodated in the sealing chamber, and has air to enter this from air inlet 62 via opening 89, with this electromagnetic coil unit of air cooling.

Armature 95 is fixed in the upper end of operating bar 76 rigidly.The central authorities of circular spring 96 are fixed on the operating bar 76, and the periphery of disk is placed in the annular ditch groove 97.Circular spring 96 can be bestowed a strength that makes progress to operating bar 76 under normal state, to keep valve 70 and 72 in closed position.Electromagnetic coil 99 is unshakable in one's determination 98 around work, and can produce a field of force when excitatory, and armature 95 is pulled down.The correspondence that can cause operating bar 76 that moves down of armature moves and air openings and transmission opening 71 is opened.When coil was not excitatory, spring 96 can rise operating bar and close opening 69 and 71.The degree that armature 95 moves down is subjected to the restriction of the ring-type shoulder 100 that cooperates with armature.

The iron core 98 of electromagnetic coil unit has a central hole 101, and this central hole 101 is communicated with central hole 66.After air enters air openings 62, can flow through the electromagnetic coil unit and enter hole 101, again by hole 66, the air openings 69 of when air openings 69 is opened, then flowing through again.Air stream through the electromagnetic coil unit with cooling this element, with the temperature that keeps the electromagnetic coil unit in an acceptable level.

Fig. 5 system is shown in the recommended structure of the fuel pressure difference regulator 16 in the fuel-metering system of above-mentioned figure one.

Fuel pressure difference regulator 16 comprises a body 150, supports a voice coil-type motor unit 151 thereon, this motor unit 151 comprise one around the work armature 153 of one central cylinder type the annular permanent magnnet 152 of concentric arrangement.One toroid 154 is set in the ring-type air clearance 155 between armature 153 and magnet 152.

Toroid 154 is fixed on the carrier member 156, and valve combination 157 is installed on the carrier member 156.The inboard periphery of circular spring 160 partly is fixed between the shoulder 149 and spring retaining ring 158 of carrier member 156.The outboard peripheries of circular spring 160 partly is fixed on the ring 159, and be supported between each " 0 " V-shaped ring 161, and circular spring one ring-type partly 165 freely is provided so that carrier member by the deflection of circular spring can have one limited upwards and downward moving.

Valve combination 157 comprises a valve element 170, and this valve element 170 is suspended in valve combination mask 171 places by being seated at the spherical portion 172 on the hole 173.Sphere portion mat normally is seated on the hole 173 around the elastic force of the spring on the work axle 175.Valve element 170 can provide moving freely of valve element 170 some degree with attached work of mode so on valve member mask 171, so that can suitably be seated at the end face of fuel openings 176 fuel openings 176 is closed.

Valve combination mask 171 be contained in threadably carrier member 156 177 in.Allowing that valve element adjusts with respect to the initial of opening 176, in by the deflection institute previously selected position of certain degree of coil component spring the time, valve member can be closed opening effectively with convenient carrier member.Lock nut 178 is in order to valve combination mask 171 is locked in desired location.

The periphery of coil component spring 180 is fixed in the hole 181 of carrier member 156, and supports a regulating lever 182 in the top of circular spring 180.Regulating lever 182 extends through armature 153, and meshes with the screw thread and the armature 153 at 183 places.The size that spring 180 acts on the downward elastic force of carrier member 156 and valve member 170 is being controlled in the axial adjustment of bar 182 in mask.Lock nut 184 is locked in selected position with regulating lever 182.

Regulating lever 182 is to make with electro insulating material, conductor rods 187 extend through regulating lever and be connected for the circular spring 180 of conductive material.One end of coil 154 is connected with circular spring 180, and the other end then with then is connected with circular spring 160, and 160 of this circular springs are connected with the conductor rods 185 that is positioned at insulating sleeve 186.The carriage framework makes with the suitable insulation material.

The outer end of passage 179 is connected with a suitable conduit, so that the fuel that bypasses through opening 176 can flow back in the fuel reservoir 15 via benchmark regulator 34.Passage 190 is in order to linking an opening 176 and a conduit, the fuel person who has pressurizeed that this conduit system is flowed out by the petrolift 14 of figure one in order to transmission.

The fuel supply pressure that utilizes petrolift 14 to come out acts on the bottom of valve element 170, acts on the strength of valve element with antagonism voice coil motor 151, and valve element is risen.Motor 151 is configured to when coil 154 is excitatory, can produce a downward power that acts on carrier member 156, rises the pressure of valve element 70 with antagonism fuel.Therefore, when the power that is produced when motor 151 is equal to the power that fuel pressure produces, valve element 170 will be in state of equilibrium.Hence one can see that, fuel falls and can be adjusted by the electric current supply of control flows coils 154 through the pressure of opening 176, and when this electric current supply system controlled according to the demand for fuel of engine, the fuel pressure that then flows to measuring room 11 can be adjusted according to the demand for fuel of engine.

See also Fig. 4, the fuel-air benchmark regulator 34 that its shown person is described by above-mentioned figure one.Benchmark regulator system comprises a body 120, and with a barrier film 122 hole in the body 121 is divided into an air chamber 123 and a fuel chambers 124.Barrier film 122 all has the area that equates in air chamber with in the fuel chambers.

The one rigidity central construct that a spring seat 126 and a valve element 127 be provided is arranged on the barrier film 122.Pressure spring 128 under the compressive state between 129 on the seat 126 on the barrier film and the body.Open tube 131 extends through the wall of fuel chambers 124 and an opening 130 that cooperates with valve element 127 is provided in fuel chambers.

Sidepiece part 132 is connected with a low-pressure fuel pipeline (36 among the figure one) outside the open tube 131, and fuel is back in the fuel reservoir 15.Opening 133 is connected with the low-pressure fuel bypass channel 179 of fuel pressure difference regulator shown in Figure 5.The air supply downstream line of the air compressor 30 among opening 134 and the figure one is connected.

One shoulder 135 is arranged in order to be connected with intermediate structure 125 when the not start of benchmark regulator in the air chamber 123, damage barrier film 122 to avoid being subjected to the strength of spring 128.

In the start, the force series of air chamber side that acts on barrier film 122 is by air supply survivor that pressure produces, and the force series that acts on the fuel chambers side of barrier film 122 adds the power sum that the spring 128 under compressive state is produced by the power that fuel pressure produced.

When air pressure was lower than making a concerted effort of power that fuel pressure and spring produced, valve element 127 will be moved upward and open opening 130.Therefore, in the start, between the fuel pressure of the downstream part of the valve element 170 of air supply pressure and fuel pressure difference regulator shown in Figure 5, there is certain in fact pressure difference.

Figure two, three, four and five elements of being described all are incorporated in the fuel system shown in the figure one.The system of other adjustment air supply and the pressure difference between the supply of fuel is also applicable to the present invention's enforcement.Promptly, more than figure say, only be one of the present invention preferred embodiment, when can not with the scope of qualification the invention process, i.e. various variations and the modification of being done according to the feature of the following request patent of the present invention part and spirit generally all should still belong in the scope that patent of the present invention contains.

Claims (31)

1, a kind of engine fuel method of measurement, its feature system comprises side by side pressure fuel supplying and air to a chamber with separately, this chamber is communicated with engine, by the air stream that flows out by this chamber fuel is sent to engine from the chamber, and be supplied to the pressure difference of the fuel and the gas of this chamber according to the adjustment of engine load, deliver to the fuel quantity person of engine to control each circulation.

2, as the fuel metering method as described in 1 of the claim the, wherein utilize the length that changes the periodic connection cycle, to control the fuel person that each circulation is transmitted.

3, as the fuel metering method as described in 1 of claim the or the 2nd, wherein fuel supply pressure is except that foundation engine load is adjusted, also according to gas supply pressure adjustment person.

4, the fuel that wherein is supplied to this chamber as the fuel metering method as described in 1 to the 3rd of the claim any in this chamber and interval during engine is communicated with gas supply isolator.

5, as the fuel metering method as described in 1 to the 4th of the claim any wherein the supply of fuel can keep and be conducted to this chamber person

6, as the fuel metering method as described in 1 to the 5th of the claim any wherein, only when this chamber is communicated with engine, just there is air to be supplied to this chamber person.

7, a kind of method of engine fuel metering, its feature system comprises fuel and gas under pressure separately is supplied in the Room, this chamber is communicated with engine, by air-flow fuel is sent to engine from the chamber, and adjust pressure difference between connection cycle fuel and gas, be sent to the fuel quantity person of engine with control.

8, as the method as described in 6 of the claims the, wherein gas only this chamber with just be supplied to that this is indoor during engine is communicated with, fuel then during being communicated with and its all can enter this indoor person at interval.

9, a kind of engine fuel method of measurement, its feature is to comprise continuously to be provided in the fixed capacity chamber that supplies fuel to a sealing under the pressure, periodically injecting gas is indoor to this, keep this indoor pressure and be not more than fuel pressure, and in air inject this chamber during one of this chamber transmitted mouthful open, thereby will work as gas and fuel injects during this chamber, at the fuel of this chamber by transmitting a mouthful sender.

10, as the method as described in 9 of the claims the, wherein fuel cooperates engine to load with pressure difference system between the gas supply to adjust, with control by transmitting a mouthful fuel quantity person who sends.

11, as above-mentioned claim every in method as described in any one, fuel pressure wherein is that pressure difference by the place's supply of fuel of control aperture is with adjustment person.

12, the device that is used for the engine fuel metering, its feature system comprises a Room an open fuel openings in indoor, the transmission mouth that a gas openings that one alternative is opened and an alternative are opened, in order to adjust with can be according to the load device of the pressure difference between fuel openings and gas openings adjustment supply of fuel and gas supply pressure of engine, and when this transmission opening is all opened, optionally open this gas and transmit opening, the device that fuel is sent out by this chamber, and when transmitting opening and open, fuel is in this chamber and can continue to enter this chamber person.

13, as the fuel metering device as described in 12 of the claims the wherein the device of this adjustment pressure difference comprise with respect to gas supply pressure adjusting the device of fuel supply pressure, and adjust the device person of pressure difference according to the engine load.

14, as the fuel metering device as described in 12 of the claims the wherein the device of this adjustment pressure difference comprise with respect to reference pressure adjusting first device of fuel supply pressure, and according to air supply pressure to adjust second device person of its reference pressure.

15, as the device as described in 14 of the claims the, wherein first device comprises an opening arrangement, the configuration of this opening arrangement system with so that fuel by the supply of fuel upstream flow of fuel openings through this aperture person, and flow through the control gear that the pressure of this opening arrangement falls according to engine changing load fuel, with this second device system in order to adjust the fuel pressure person in opening arrangement downstream.

16, the device that is used for the engine fuel metering, its feature system comprises the sealing chamber of a fixed capacity, there is a fuel to transmit a mouth and a gas inlet in this chamber, and can simultaneously optionally open and close the valving of this opening, with can continue down fuel supplying to inject the fuel supply device of this chamber in pressure, and deserve to make gas inject this chamber when two openings are opened, and make pressure in this chamber be not more than the gas supply device of fuel pressure, and adjust the pressure difference between this indoor gas and supply of fuel when these openings are all opened, to adjust the device person of the fuel quantity that is transmitted when this transmission mouthful is opened.

17, as the device as described in each in 12 to the 16th of the claim the, wherein comprise control and transmit the device person that opening is opened the length of interval.

18, as the device as described in 16 of the claims the, wherein transmission valve device and gas valve device all with electromagnetic coil coupling, these openings can be opened when excitatory with convenient electromagnetic coil, and in order to change electromagnetic coil excitatory during the device person of length.

19, as the device as described in 12 to 15 of the claims any, wherein this chamber is the fixed capacity chamber person of a sealing.

20, as the device as described in 12 to 15 of the claims any, wherein gas openings mouthful is configured to and can opens simultaneously basically and the shutter with transmitting.

21, as the device person as described in 20 of the claims the, wherein gas openings all has the selectable valving that opening is opened and closed with the transmission opening, and these valvings and an electromagnetic coil are coupled, with this electromagnetic coil of box lunch when excitatory, these openings are opened, and in order to change electromagnetic coil excitatory during the device person of length.

22, as claim the 16, each described device in 18 or 20, wherein this transmission mouthful is an arranged coaxial with gas openings, and valving all matches with each opening, and these valvings all are coupled so that can side by side open basically and the shutter.

23, as the device as described among 21 of claims the or the 22nd any, wherein a valving is coupled on the operating bar member rigidly, and another valving system is limited mobile relation being coupled on this operating bar member, therefore working as the operating bar member moves to a direction, when utilizing each valving that these openings are closed, after system closes corresponding opening with this another valving earlier, this operating bar member then moves for another valving again, and with the opening shutter of this valving with its associated.

24, as the device as described in 23 of the claims the, wherein this another valving moves with respect to operating bar is, is to utilize the device of resilient deflection to give the antagonist.

25, as the device as described in 12 to 23 of the claims any, wherein supply of fuel is to comprise fuel is sent to this chamber pump-unit by a fuel reservoir, and pilot pressure difference device system comprises fuel upstream bypass with pump-unit to fuel reservoir person, and adjusts the device person of flow rate of fuel via bypass to control fuel pressure in this chamber.

26, as the device as described in the claim the 25, wherein utilize bypass with the device of adjusting flow rate of fuel be can be according to the demand for fuel of engine start person.

27, as the device as described in 25 or 26 of the claims the, wherein adjust the bypass person of the device system of turnover rate via the aperture of a size that can change.

28, as the device as described in 25 to 27 of the claims any, the device of wherein controlling this pressure difference also comprises the flow through device person of pressure of bypass of control fuel.

29, as the device as described in 28 of the claims the, wherein the pressure system that controls of this device is in order to keep predetermined pressure differential person between this pressure and gas supply pressure.

30, valve control device system comprises two openings, each valve element all cooperates with each opening, and when mobile, side by side open and close these openings basically, each valve element all is coupled with the operating bar member, therefore, moving of operating bar member, this two valve element can be moved, to open or close these openings, one of them valve element system is coupled on the operating bar member rigidly, and another valve element system is limited mobile relation being coupled on this operating bar member; Therefore, when operating bar moves to a direction, opening can be closed, and when other direction moves, being about to opening opens, and mobile operating bar with close opening serve as in proper order its opening is closed earlier with this another valve element after, this operating bar member then moves with respect to this another valve element again, and with this valve element with another opening shutter.

31, as the device as described in 30 of the claims the, wherein this another valve element moves with respect to the operating bar member is, is that the device that utilization can flexible deflection gives the antagonist.

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