CN100441849C - Fuel supply apparatus for internal combustion engine - Google Patents
Fuel supply apparatus for internal combustion engine Download PDFInfo
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- CN100441849C CN100441849C CNB2005800117885A CN200580011788A CN100441849C CN 100441849 C CN100441849 C CN 100441849C CN B2005800117885 A CNB2005800117885 A CN B2005800117885A CN 200580011788 A CN200580011788 A CN 200580011788A CN 100441849 C CN100441849 C CN 100441849C
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- fuel
- pressure
- fuelinjection nozzle
- pump
- engine
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- 239000000446 fuel Substances 0.000 title claims abstract description 184
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 34
- 238000002347 injection Methods 0.000 claims abstract description 43
- 239000007924 injection Substances 0.000 claims abstract description 43
- 239000007921 spray Substances 0.000 claims description 30
- 230000001737 promoting effect Effects 0.000 claims 2
- 239000000203 mixture Substances 0.000 abstract description 13
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000013049 sediment Substances 0.000 description 9
- 230000000630 rising effect Effects 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- 238000009834 vaporization Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 241000220317 Rosa Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
In a fuel supply apparatus for an internal combustion engine including a first fuel injection valve for directly injecting a fuel into a cylinder and a second fuel injection valve for injecting the fuel into an intake manifold, production of deposits in the first fuel injection valve is prevented and a satisfactory homogenous air-fuel mixture can be formed during homogenous combustion while an engine is idle. In order to achieve this effect, during homogenous combustion while the engine is idle, a second fuel injection valve (12) injects the fuel and a first fuel injection valve (11) injects the fuel to which pressure has been applied by a low-pressure pump (21), without a high-pressure pump (23) applying further pressure to the fuel.
Description
Technical field
The present invention relates to a kind of fuel supply device of internal-combustion engine.
Background technique
Be well known that internal-combustion engine comprises first Fuelinjection nozzle and second Fuelinjection nozzle, wherein first Fuelinjection nozzle directly injects fuel in the cylinder, is used for layer combustion, and second Fuelinjection nozzle injects fuel into intake manifold, is used for even burning.
In the even combustion process in such internal-combustion engine, when the fuel injection from first Fuelinjection nozzle stops, the first Fuelinjection nozzle split shed may rise to the temperature in the spray-hole of cylinder, produces sediments in spray-hole, causes the obstruction of spray-hole.For fear of such problem, also burner oil of second Fuelinjection nozzle but also first Fuelinjection nozzle has been proposed in even combustion process not only, rising (for example, with reference to the open No.2002-364409 of Japan Patent) with temperature in the spray-hole that suppresses first Fuelinjection nozzle.
Be fed to cylinder in vaporific mode with air inlet to the fuel of intake manifold by second fuel injection valves inject.Therefore, and directly inject fuel into cylinder by first Fuelinjection nozzle and compare, help forming the even air-fuel mixture of stratiform by the fuel of second fuel injection valves inject.Simultaneously, when fuel in aspirating stroke by first fuel injection valves inject during to cylinder because the latent heat of carburretion, the temperature in the cylinder reduces.Therefore, knocking can be suppressed, and the efficient of super charge can be improved.
Therefore, can not think that the internal-combustion engine of carry out stratified charge combustion is provided with first Fuelinjection nozzle and second Fuelinjection nozzle, wherein, first Fuelinjection nozzle directly injects fuel in the cylinder, and second Fuelinjection nozzle injects fuel into intake manifold.When first Fuelinjection nozzle is set as mentioned above, preferably from first injects fuel, so that during the serviceability that the fuel that does not need first Fuelinjection nozzle especially sprays, suppress the rising of temperature in the spray-hole.
In any one internal-combustion engine, when idle running, evenly burn.Like this, that preferably the fuel injection ratio of second Fuelinjection nozzle is set is bigger, make the most of fuel of injection of second Fuelinjection nozzle help forming gratifying even air-fuel mixture, and only be enough to suppress the fuel quantity of the rising of temperature in the spray-hole from first fuel injection valves inject.
For layer combustion, first Fuelinjection nozzle should inject fuel in the cylinder with elevated pressures in compression stroke, therefore, sets high injection pressure.Even when not carrying out layer combustion, the jet pressure in first Fuelinjection nozzle is also set higher, so that the fuel atomizing that is mapped in the cylinder to be painted.Therefore, in first Fuelinjection nozzle, it is not very little opening minimum fuel injection amount constantly corresponding to the minimum valve that allows the control fuel injection amount.On the contrary, especially during the even burning when the race of engine, combustion temperature is not very high.Therefore, it is quite little to stop product in first Fuelinjection nozzle to deposit needed emitted dose, even less than the minimum fuel injection amount of first Fuelinjection nozzle.Thereby when the race of engine, first fuel injection valves inject is higher than the fuel quantity of demand.In addition, because it is also quite little to move the essential fuel quantity of motor, sprays so can not set the height ratio fuel of second Fuelinjection nozzle, thereby cause being difficult to form gratifying even air-fuel mixture.
Summary of the invention
As can be seen from the above, the objective of the invention is to a kind of fuel supply device that is used for internal-combustion engine, this fuel supply device comprises: first Fuelinjection nozzle that directly injects fuel into cylinder, and second Fuelinjection nozzle that is used to inject fuel into intake manifold, wherein can stop the sedimental generation in first Fuelinjection nozzle, and during the even burning of the race of engine, can form gratifying even air-fuel mixture.
A kind of fuel supply device that is used for internal-combustion engine according to the present invention comprises: directly inject fuel into first Fuelinjection nozzle of cylinder, low pressure pump is applied to the described fuel that is used for fuel pressure, and high-pressure service pump is applied to described fuel with further pressure; And second Fuelinjection nozzle that is used to inject fuel into intake manifold, wherein during the even burning of the race of engine, the described fuel of described second fuel injection valves inject, and described first fuel injection valves inject is exerted pressure by described low pressure pump and described high-pressure service pump does not apply the fuel of further pressure.
A kind of fuel supply device that is used for internal-combustion engine according to the present invention comprises: directly inject fuel into first Fuelinjection nozzle of cylinder, low pressure pump is applied to the described fuel that is used for fuel pressure, and high-pressure service pump is applied to described fuel with further pressure; And second Fuelinjection nozzle that is used to inject fuel into intake manifold, wherein when the race of engine, only described first fuel injection valves inject is exerted pressure by described low pressure pump and described high-pressure service pump does not apply the fuel of further pressure.
A kind of fuel supply device that is used for internal-combustion engine according to the present invention comprises: directly inject fuel into first Fuelinjection nozzle of cylinder, low pressure pump is applied to the described fuel that is used for fuel pressure, and high-pressure service pump is applied to described fuel with further pressure; And second Fuelinjection nozzle that is used to inject fuel into intake manifold, wherein during the even burning of the race of engine, only described first Fuelinjection nozzle sprays in aspirating stroke is exerted pressure by described low pressure pump and described high-pressure service pump is not applied to further pressure its fuel.
Description of drawings
Fig. 1 is the schematic representation that the internal-combustion engine of the with good grounds fuel supply device of the present invention of attaching is shown.
Fig. 2 illustrates based on two operating area A of engine speed on the motor and load and the plotted curve of B.
Fig. 3 illustrates the plotted curve that concerns between 1/2 power of fueling injection pressure and the minimum fuel injection amount.
Embodiment
Fig. 1 is the schematic representation that the internal-combustion engine of the with good grounds fuel supply device of the present invention of attaching is shown.In Fig. 1, internal-combustion engine is made of following array apparatus: engine main body 1; The tandem-driving bogie 2 that cylinder is shared; Be connected in the intake manifold 3 between tandem-driving bogie 2 and each cylinder; And at the shared inlet duct 4 of the upstream side cylinder of tandem-driving bogie 2.Throttle valve 5 is close to the upstream that is arranged in tandem-driving bogie 2 in inlet duct 4.Also be provided with the exhaust duct 6 that is connected to each cylinder.
Engine main body 1 comprises suction valve 7, outlet valve 8, piston 9, spark plug 10, be used for directly injecting fuel into first Fuelinjection nozzle 11 of cylinder and be arranged in second Fuelinjection nozzle 12 in each intake manifold 3.
This internal-combustion engine obtains evenly burning by this way during all engine operation state, this mode make second Fuelinjection nozzle 12 (when INO) with inlet hole synchronously or (before INO) and the asynchronous mode burner oil of inlet hole so that with the fuel of atomizing with enter air and be ejected in the cylinder together.First Fuelinjection nozzle 11 is set, so that by in aspirating stroke, injecting fuel into the temperature that reduces in the cylinder in the cylinder, the quick-fried sound that shakes during low engine speed of feasible inhibition and the high load condition, and improve the efficient that the supercharging during high engine speed and high load condition enters air.
In the operating area B shown in Fig. 2, the fuel of first Fuelinjection nozzle 11 sprays fuel with the fuel quantity ratio that needs and second Fuelinjection nozzle 12 and sprays with the fuel quantity ratio that needs and for example be individually set to 50%.On the other hand, in the operating area A that comprises low engine speed and low load condition shown in Fig. 2, for the operation motor, it is not essential especially that the fuel of first Fuelinjection nozzle 11 sprays, and preferably, second Fuelinjection nozzle 12 spray all that be used to form gratifying even air one fuel mixture must fuel.
Yet first Fuelinjection nozzle 11 has the spray-hole open to cylinder.Therefore, when the fuel injection stopped, the temperature in the spray-hole rose, and tends to produce sediments.Under serious situation, because sedimental generation, spray-hole is blocked.Therefore, even when not needing to move motor, also should carry out fuel and spray.In this internal-combustion engine, in operating area A, the fuel of setting first and second Fuelinjection nozzles sprays the ratio with required fuel quantity, makes the Fuelinjection nozzle 11 of winning with the minimum flow burner oil, to stop sedimental generation.
With reference to figure 1, internal-combustion engine comprises fuel tank 20, low pressure pump 21 (being generally power type) and cylinder is shared and the low-pressure side accumulator 22 of the fuel that storage low pressure pump 21 has been exerted pressure again.Because second Fuelinjection nozzle 12 is used for injecting fuel into intake manifold 3, therefore second Fuelinjection nozzle 12 sprays the fuel that is stored in the low-pressure side accumulator 22.Simultaneously, first Fuelinjection nozzle 11 should promote vaporization by the fuel of abundant atomized spray in cylinder.In order to reach above purpose, preferably produce and enter enough frictional force between the air by rising jet pressure and the power of advancing that increases injected fuel spray.In the present embodiment, be provided for further pressure being applied to the high-pressure service pump 23 (being generally the air cylinder driven type) that is stored in the fuel in the low-pressure side accumulator 22.The fuel reservoir of being exerted pressure by high-pressure service pump 23 has been in the shared high-pressure side accumulator 24 of cylinder, and first Fuelinjection nozzle 11 sprays the fuel under high pressure that is stored in the high-pressure side accumulator 24.
In operating area B, the temperature in the cylinder is quite high.Therefore, when the fuel under high pressure of spraying by first Fuelinjection nozzle 11 by and the friction atomizing back that enters air fully during vaporization, fuel under high pressure and form full and uniform air one fuel mixture together by the fuel that second Fuelinjection nozzle 12 is fed to the spray pattern of cylinder.Therefore can realize fabulous even burning.Simultaneously, equally in operating area A, as by and enter the result of the friction atomizing of air, promote to stop the vaporization of the fuel under high pressure that sediments produces by first Fuelinjection nozzle 11 being used to of spraying.Therefore, fuel under high pressure can be made us quite satisfied even air-fuel mixture with the 12 supplied fuel formation of second Fuelinjection nozzle.
Here, in operating area A, stop minimum flow that in first Fuelinjection nozzle 11 sediments produces required fuel with cylinder in temperature reduce corresponding to the running state of motor and reduce, and when the race of engine acquisition minimum value.Each Fuelinjection nozzle has the minimum fuel injection amount qmin of scale length when opening corresponding to the minimum valve that allows the control fuel injection amount.Fig. 3 illustrates the 1/2 power P that identical minimum valve is opened the fueling injection pressure of time span
1/2And the relation between the minimum fuel injection amount qmin.As shown in Figure 3, when fueling injection pressure was bigger, it is bigger that minimum fuel injection amount qmin becomes, and when injection was stored in the fuel of the high pressure P 2 in the high-pressure side accumulator 24, minimum fuel injection amount qmin2 was not very little.
Like this, stop when the race of engine sediments in first Fuelinjection nozzle 11 to produce the minimum fuel injection amount qmin2 of required smallest amount of fuel less than first Fuelinjection nozzle 11 when the inject high pressure fuel.Therefore, if when the race of engine, first Fuelinjection nozzle 11 sprays the fuel under high pressure that is stored in the high-pressure side accumulator 24, even open at minimum valve under the situation of time span, sprays than being used to stop the essential big fuel quantity of smallest amount of fuel (qmin2) of sediments generation.When the race of engine, it is quite little to move the required fuel quantity of motor.Therefore, if the fuel injection ratio of second Fuelinjection nozzle 12 reduces, the fuel injection amount that helps forming second Fuelinjection nozzle 12 of gratifying even air-fuel mixture significantly reduces, and can cause the evenly deterioration of burning this moment.
In order to address this problem, according to present embodiment, setting can be connected to low-pressure fuel injection valve 11 selects one switch valve 25 in high-pressure side accumulator 24 and the low-pressure side accumulator 22, so that switch valve 25 is connected to low-pressure side accumulator 22 with first Fuelinjection nozzle 11 during the even burning of the race of engine.So, the fuel that is stored in the low pressure P1 in the low-pressure side accumulator 22 sprays from first Fuelinjection nozzle 11, so that stop sedimental generation when the race of engine.Here, the minimum fuel injection amount qmin1 that opens time span corresponding to minimum valve is significantly smaller than above-mentioned qmin2, as shown in Figure 3.Therefore, by the time span that control valve is opened, can suitably spray and be used for stoping at that time sediments to produce required smallest amount of fuel.
As mentioned above, the q.s fuel that can guarantee to help to form second Fuelinjection nozzle 12 of even air-fuel mixture sprays, and can obtain fabulous even burning.When the race of engine, can stop the operation of high-pressure service pump 23.So, can reduce the noise that when operate high pressure pump 23, produces.
According to embodiments of the invention, when the race of engine, first Fuelinjection nozzle 11 has sprayed the low-pressure fuel that is stored in the low-pressure side accumulator 22.First Fuelinjection nozzle 11 is primarily aimed among the operating area A that stops sediments to produce burner oil therein, stop sediments to produce needed fuel quantity during suitably also being injected in reliably during the race of engine, first Fuelinjection nozzle 11 can spray the low-pressure fuel that is stored in the low-pressure side accumulator 22 naturally.Reduce pressure that the fuel of first Fuelinjection nozzle 11 sprays and be unfavorable for the fuel atomizing of spraying, but, can suppress when the fuel that sprays enters the piston head surface because the adhesion of the fuel that collision therebetween causes, and total amount of unburned fuel that can reduce to discharge.
According to present embodiment, obtain the evenly internal-combustion engine 1 of burning under all engine operation state though be described in, present embodiment is not limited thereto.For example, as long as motor evenly burns when it dallies, then this motor may obtain non-homogeneous burning, and for example obtains layer combustion in the low load operation zone during the race of engine.During layer combustion, first Fuelinjection nozzle 11 will be stored in high-pressure side accumulator 24 in the latter half part of compression stroke fuel under high pressure is under high pressure sprayed and is entered cylinder.The fuel of Pen Sheing directly or by being formed ground chamber 9a in piston 9 top surfaces guides near spark plug 10 zones and form combustible air-fuel mixture near spark plug 10 thus.
＜change
In the above-described embodiments, when the race of engine, first Fuelinjection nozzle 11 sprays the low-pressure fuel that is stored in the low-pressure side accumulator 22, and also burner oil of second Fuelinjection nozzle 12.In this variation, fuel sprays in the following manner.
In this variation, when the race of engine, first Fuelinjection nozzle 11 sprays the low-pressure fuel that is stored in the low-pressure side accumulator 22, and still, second Fuelinjection nozzle 12 is burner oil not.That is to say that the fuel that stops to help forming second combustion injection valve 12 of gratifying even air-fuel mixture sprays.Here, in order to form even air-fuel mixture, the moment that the fuel of first Fuelinjection nozzle 11 can be sprayed is set in the aspirating stroke.
Because fuel does not spray from second Fuelinjection nozzle 12,, can spray the fuel that needs when the race of engine from first Fuelinjection nozzle 11 so spraying total amount.Therefore, when the race of engine, can spray certain than the required bigger fuel quantity of smallest amount of fuel of deposition that stops in first Fuelinjection nozzle 11.Therefore, spray-hole can cool off fully, and can avoid sedimental generation.
Here, the pressure that is fed to the fuel of first Fuelinjection nozzle 11 can be set at the same high with the fuel pressure at second Fuelinjection nozzle, 12 places,, is set to 200kPa to 600kPa that is.
When the race of engine, as above-mentioned embodiment, first Fuelinjection nozzle 11 is connected to low-pressure side accumulator 22 by switch valve 25.Can stop the driving of high-pressure service pump 23, so that reduce by driving high-pressure service pump 23 caused noises.
In the schematic representation shown in Fig. 1, though switch valve 25 is connected to low-pressure side accumulator 22 with first injection valve 11 during being set at the even burning of the race of engine, the present invention is not limited to such structure.Generally speaking, in by engine-driven high-pressure service pump 23, when pump plunger is opened by engine-driven cam reduction and spill valve, introduce (suction) fuel.High-pressure service pump 23 cuts out the electromagnetism spill valve by change moment control is when pump plunger fuel quantity from its release during by cam lift.When moment of in the compression stroke that pump plunger promotes, closing the electromagnetism spill valve more early the time, discharge more substantial fuel.On the contrary, when constantly more late, discharge fuel more in a small amount.Here, the driving energy rate of the electromagnetism spill valve when discharging maximum flow fuel is assumed to be 100%, and the driving energy rate of electromagnetism spill valve is assumed to be 0% when discharging minimum amount of fuel.If the driving energy rate of electromagnetism spill valve is 0%, the electromagnetism spill valve is not closed, and stays open state.That is to say that as long as cam continues rotation (as long as motor continues rotation), pump plunger carries out sliding movement at above-below direction.Though the electromagnetism spill valve is not closed, and does not exert pressure to fuel.Therefore, during the even burning of the race of engine, the driving energy rate of electromagnetism spill valve is set at 0%, so that do not exert pressure to fuel, low-pressure fuel can be fed to first Fuelinjection nozzle 11 thus.So, do not need to be provided with pipe by-pass switch valve 25 or high-pressure service pump 23 and high-pressure side accumulator 24.In addition, because do not produce high pressure, so can reduce by driving the sound that high-pressure service pump 23 causes.
Though described and explained the present invention in detail, it should be clearly understood that this just is used for explaining and example, and not will be understood that it is restriction that the spirit and scope of the present invention are only limited by claim.
Claims (3)
1. fuel supply device that is used for internal-combustion engine comprises:
Directly fuel is sprayed first Fuelinjection nozzle that enters cylinder, low pressure pump is applied to described fuel with fuel pressure, and high-pressure service pump is applied to described fuel with the pressure of promoting; And
The fuel injection is entered second Fuelinjection nozzle of intake manifold, wherein
When needing the even combustion regime of tickover, described second fuel injection valves inject is by the described fuel of described low pressure pump supercharging, and described first fuel injection valves inject is exerted pressure by described low pressure pump and described high-pressure service pump does not apply the fuel of the pressure of enhancement.
2. fuel supply device that is used for internal-combustion engine comprises:
Directly fuel is sprayed first Fuelinjection nozzle that enters cylinder, low pressure pump is applied to described fuel with fuel pressure, and high-pressure service pump is applied to described fuel with the pressure of promoting; And
The fuel injection is entered second Fuelinjection nozzle of intake manifold, wherein
When needs race of engine state, only described first fuel injection valves inject is exerted pressure by described low pressure pump and described high-pressure service pump does not apply the fuel of the pressure of enhancement.
3. fuel supply device as claimed in claim 2, wherein
Only described first Fuelinjection nozzle sprays in aspirating stroke is exerted pressure by described low pressure pump and described high-pressure service pump does not apply the fuel of the pressure of enhancement.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP125376/2004 | 2004-04-21 | ||
| JP2004125376 | 2004-04-21 | ||
| JP118443/2005 | 2005-04-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1942664A CN1942664A (en) | 2007-04-04 |
| CN100441849C true CN100441849C (en) | 2008-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005800117885A Expired - Fee Related CN100441849C (en) | 2004-04-21 | 2005-04-19 | Fuel supply apparatus for internal combustion engine |
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| CN (1) | CN100441849C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009056026B4 (en) * | 2009-11-27 | 2018-01-11 | Audi Ag | Method for operating an internal combustion engine of a motor vehicle |
| US9194323B2 (en) * | 2011-03-31 | 2015-11-24 | Toyota Jidosha Kabushiki Kaisha | Fuel injection device |
| DE102015211688A1 (en) * | 2015-06-24 | 2016-12-29 | Robert Bosch Gmbh | Method for operating an internal combustion engine |
| DE102015211694A1 (en) * | 2015-06-24 | 2016-12-29 | Robert Bosch Gmbh | Method for operating an internal combustion engine |
| CN111219235A (en) * | 2018-11-23 | 2020-06-02 | 宝沃汽车（中国）有限公司 | Vehicle exhaust gas treatment method, device, storage medium and vehicle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5438967A (en) * | 1992-10-21 | 1995-08-08 | Toyota Jidosha Kabushiki Kaisha | Internal combustion device |
| US5622152A (en) * | 1994-07-08 | 1997-04-22 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Pressure storage fuel injection system |
| US5924405A (en) * | 1996-12-19 | 1999-07-20 | Toyota Jidosha Kabushiki Kaisha | Apparatus and method for injecting fuel in cylinder injection type engines |
| EP1132598A1 (en) * | 1998-10-27 | 2001-09-12 | Toyota Jidosha Kabushiki Kaisha | Device and method for engine control |
| JP2002364409A (en) * | 2001-06-06 | 2002-12-18 | Toyota Motor Corp | Fuel injection control device for cylinder injection type internal combustion engine |
-
2005
- 2005-04-19 CN CNB2005800117885A patent/CN100441849C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5438967A (en) * | 1992-10-21 | 1995-08-08 | Toyota Jidosha Kabushiki Kaisha | Internal combustion device |
| US5622152A (en) * | 1994-07-08 | 1997-04-22 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Pressure storage fuel injection system |
| US5924405A (en) * | 1996-12-19 | 1999-07-20 | Toyota Jidosha Kabushiki Kaisha | Apparatus and method for injecting fuel in cylinder injection type engines |
| EP1132598A1 (en) * | 1998-10-27 | 2001-09-12 | Toyota Jidosha Kabushiki Kaisha | Device and method for engine control |
| JP2002364409A (en) * | 2001-06-06 | 2002-12-18 | Toyota Motor Corp | Fuel injection control device for cylinder injection type internal combustion engine |
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| CN1942664A (en) | 2007-04-04 |
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