CN1594848A - Fuel supply system and method for internal combustion engine - Google Patents
Fuel supply system and method for internal combustion engine Download PDFInfo
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- CN1594848A CN1594848A CNA2004100785130A CN200410078513A CN1594848A CN 1594848 A CN1594848 A CN 1594848A CN A2004100785130 A CNA2004100785130 A CN A2004100785130A CN 200410078513 A CN200410078513 A CN 200410078513A CN 1594848 A CN1594848 A CN 1594848A
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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
- Y02T10/12—Improving ICE efficiencies
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- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
On a fuel supply passage freely changing fuel pressure and supplying fuel to the fuel injection valve, at starting, pressure is set higher than that in a normal condition, for predetermined time, and injection pulse width is also largely controlled. Therefore, by injection flow energy of fuel, deposits accumulated on an injection hole of the fuel injection valve are efficiently removed in every operation.
Description
Technical field
The present invention relates to be the technology of removal attached to the attachment fueling in the spray-hole of the Fuelinjection nozzle of internal-combustion engine.
Background technique
Fuel supplying device as internal-combustion engine, known have, a part of unburned of fuel and in the spray-hole attached to Fuelinjection nozzle, not volatile carbonization composition is exposed to and becomes attachment under the condition of high temperature and pile up in this deposited fuel, when if the accumulating amount of attachment increases, will worsen the fuel injection amount characteristic.Therefore, open the spy and to disclose following technology in the 2002-13436 communique, judgement should be removed the time of attachment, dispels and remove attachment by improving fueling injection pressure.
In addition, in the problem that directly exists in the Fuelinjection nozzle of firing chamber burner oil is attachment, but the problem that exists when volatile ingredient low quality fuel how is hanged down in use is, even also produce attachment under the condition of high temperature of Fuelinjection nozzle after running stops of tuned port injection.
But, above-mentioned technology needs sensor in the removal of judging attachment during the time, and the running that is deposited in of attachment stops the back increase, and the removal time of carrying out attachment after running is judged, so can not remove attachment during this period, sometimes will cause fuel injection characteristic to reduce, worsen runnability.
Summary of the invention
The objective of the invention is to not use sensor just can remove attachment, and can keep good runnability.
In order to achieve the above object, the fuel supplying device of internal-combustion engine of the present invention, change the fuel pressure of adjusting the fueling injection valve arbitrarily by the fuel pressure regulating mechanism, it is fueling injection pressure, it constitutes, in when starting, at the appointed time to be higher than the fuel pressure fueling when running well, from Fuelinjection nozzle with high-pressure injection fuel.
Like this, when each starting with high-pressure injection fuel, thereby can effectively remove attachment.
And, not needing to judge especially the removal of attachment, attachment will be removed at once after starting, so do not need to use sensor.
And, can often reduce adhesion amount, obtain good spray characteristic, keep good runnability.
Feature structure of the present invention will be clearer and more definite according to the following explanation of doing with reference to accompanying drawing.
Description of drawings
Fig. 1 is the figure of the system architecture of expression embodiments of the present invention.
Fig. 2 is the sectional arrangement drawing of spray regime of the Fuelinjection nozzle of this mode of execution of expression.
Fig. 3 is the amplification profile of spray-hole periphery of the Fuelinjection nozzle of this mode of execution of expression.
Fig. 4 is the figure of expression attachment at the attachment state of the spray-hole in band tapering.
Fig. 5 is the sequential chart that the attachment of this mode of execution of expression is removed the fuel pressure and the basic status that injection pulse width changes of control.
Fig. 6 is the figure that the expression attachment is removed the variety of way of the injection pulse of controlling.
Fig. 7 is the figure that first example of the operating condition that the attachment removal is controlled has been considered in expression.
Fig. 8 is the figure that second example of the operating condition that the attachment removal is controlled has been considered in expression.
Embodiment
Below, with reference to the description of drawings embodiments of the present invention.
In Fig. 1 of expression system architecture, the fuel in the fuel tank 1 is attracted by DYN dynamic petrolift 2.
Be pressed and delivered to the electromagnetic drive type Fuelinjection nozzle 4 of each cylinder by fuel supply channel 3 from the fuel of these petrolift 2 ejections.
Fuel buffer (damper) 5 is set on described fuel supply channel 3, the fuel pressure sensor 6 that detects fuel pressure is installed on the fuel platform part 3A of downstream end.
Described Fuelinjection nozzle 4 is to drive valve when top electromagnetic coil (not shown) is switched on, and closes the electro-magneto fuel injector of valve when stopping to switch on.
These Fuelinjection nozzle 4 bases are controlled out valve corresponding to the ejection pulse signal of the predetermined pulse width Ti (opening valve time) of the required fuel quantity of the internal-combustion engine of carrying from control unit 7, as shown in Figure 2, burner oil in the suction port 22 of each cylinder of internal-combustion engine 21.
In Fig. 3 of the spray-hole portion periphery of representing described Fuelinjection nozzle 4, in the inboard, underpart of sleeve pipe (casingpipe) 41, intercalation valve body 44 and it is free to slide at axle direction.This valve body 44 forms as one by welding tubular fixture (anchor) 42 and ball 43.
And, place the ball 43 of described valve body 44, valve base part 45 soldered being bonded on the described sleeve pipe 41 of jetburner arranged at the central part opening.
In the lower end of described valve base part 45, welding joint the spray nozzle board 46 that has a plurality of spray-hole 46a.The hole axle of described a plurality of spray-hole 46a is with respect to the inclined of Fuelinjection nozzle 4, and simultaneously certain with respect to the sectional area of upstream side straight part is formed with the tapering (with reference to Fig. 4) that sectional area enlarges in the downstream side.
And by the energising of described electromagnetic coil, described valve body 44 rises, and then fuel is radial injection by described a plurality of spray-hole 46a, forms coniform spraying.
Described control unit 7 is built-in with micro computer, except that testing signal from described fuel pressure sensor 6, also import suction air quantity testing signal Q from Air flow meter 11, from the internal-combustion engine rotational speed signal Ne of crank angle sensor 12, from the connection (ON) of engine cooling water temperature (hereinafter referred to as the water temperature) Tw of cooling-water temperature sensor 13, motor key switch 14, disconnect (OFF) signal etc.
And, control the fuel pressure of supplying with to described Fuelinjection nozzle 4 as described below at control unit 7.
During normal operation after starting,, calculate the fuel quantity that requires of internal-combustion engine according to described suction air quantity Q and internal-combustion engine rotational speed Ne.Require fuel quantity according to this, set the pulse width (opening valve time) of the ejection pulse signal export to described Fuelinjection nozzle 4 and supply with the fuel pressure of this Fuelinjection nozzle 4, the target fuel pressure Pa of promptly described petrolift 2.And, the ejection pulse signal with described pulse width is exported to described Fuelinjection nozzle 4, make its burner oil.Simultaneously, carry out feedback control according to described target fuel pressure and the actual fuel pressure that detects by described fuel pressure sensor 7, so that control petrolift 2 wait control duty cycle signals that carries out behind the feedback compensation to export to pump drive circuit (FPCM) 15 by PID control, thereby obtain target fuel pressure Pa.
On the other hand, when engine starting, carry out the control of removal attachment involved in the present invention as described below.
At first, with reference to Fig. 5 basic control example is described.When the making operation by motor key switch 14 is judged to be starting, fully high attachment is removed and is used high pressure P h when being set at target fuel pressure Pa than normal operation, increase the driving electric power of fueling pump 2 and ejection pressure is boosted, to obtain this high pressure P h (with reference to this figure (A)).
And, under the state that is controlled to be this maximum fuel pressure P h, in the discharge time of regulations such as intake stroke, the ejection pulse signal with maximum pulse is exported to described Fuelinjection nozzle 4, make its burner oil (with reference to this figure (B)).
After carrying out this fuel injection of several at short notice, reduce target fuel pressure Pa gradually, reduce the pulse width of ejection pulse signal simultaneously gradually,, switch to control with normal fuel pressure, injection pulse through after the stipulated time that sets.
According to above-mentioned control, when each internal-combustion engine stops, being exposed under the condition of high temperature and being deposited in attachment among the spray-hole 46a of Fuelinjection nozzle 4 by carrying out multiple fuel injection with maximum fuel pressure P h, jet flow energy by fuel is effectively dispelled, even spray with the fuel pressure that is higher than under the normal condition afterwards, also can dispel the removal attachment.
And, above-mentioned attachment is removed control and is carried out when starting, do not judge the attachment removal time and do not use special sensor or diagnosis control to wait, thereby after starting, can obtain good spray characteristic immediately, since when starting require fuel quantity big, so carry out high-pressure injection easily, under the situation that does not influence startability, carry out attachment and remove control.
And, can carry out switching to without a break the control of fuel pressure just often from maximum fuel pressure, as described in above-mentioned example,, can guarantee runnability smoothly, and can not make the operating condition rapid change by reducing fuel pressure and injection pulse width gradually.
And, as shown in Figure 4, make spray-hole 46a form the straight part certain with respect to the sectional area of upstream side, its downstream side has the tapering that sectional area enlarges, so relation that flows and be detained based on fuel, attachment is only attached on the part from the straight part to the tapering, and the area of contact of attachment and throttle orifice face is little, so the contact force weakness.Therefore, the effect of removing with high-pressure injection is remarkable.
Basic mode of texturing as above-mentioned attachment control, on the basis of the high pressure that pressure is set at regulation, shown in Fig. 6 (B), can in short cycle, carry out an injection (this figure (A) cyclic spray of expression basic example once) during the cyclic spray intermittently.Generally, compare, in the short time (need more than specified value), carry out repeatedly the mode of interrupted injection, also can follow oscillating action, thereby can improve the attachment removal effect injection valve with injection situation once in long-time.In addition, make the total pulse widths that adds up to each pulse width, even the mode that amount of fuel injected equates is an optimal way of guaranteeing good startability.
And, above-mentioned example shown is removed the time weak point of controlling but carry out attachment, so shown in Fig. 6 (C) in the example of discharge time (intake stroke etc.) injection of each regulation, also can constitute, carry out interrupted injection with cycle regular hour at the appointed time.But, preferably be controlled to be the emitted dose that makes each unit of time and equate.
And, can simple and easyly be controlled to be, only satisfy the fuel quantity that requires, but the operating condition (internal-combustion engine rotational speed, water temperature etc.) also can consider to start the time sets and require fuel quantity, satisfy the High Accuracy Control of this demanded fuel amount corresponding to the amount of time after the starting.
Particularly, shown in Fig. 7 (A), (B), the pulse width (injection pulse width) that makes ejection pulse signal is irrelevant and it is made as certain value with operating condition (internal-combustion engine rotational speed, water temperature etc.), and fuel pressure is set at and can changes according to operating condition.
Perhaps, shown in Fig. 8 (A), (B), make fuel pressure and operating condition (internal-combustion engine rotational speed, water temperature etc.) irrelevant and it is made as certain value, injection pulse width is set at and can changes according to operating condition.
Claims (20)
1. the fuel supplying device of an internal-combustion engine is characterized in that, comprising:
The petrolift of the fuel in the ejection fuel tank;
Spray the Fuelinjection nozzle of the fuel that sprays by described petrolift to internal-combustion engine;
Detect the starting feeler mechanism of the starting state of internal-combustion engine;
In when starting, the fuel pressure of supplying with described Fuelinjection nozzle from described fuel-injection pump is controlled to be control unit when being higher than normal operation at the appointed time.
2. the fuel supplying device of internal-combustion engine according to claim 1 is characterized in that, described control unit was controlled to be fuel pressure under the state of high pressure in when starting, from Fuelinjection nozzle burner oil intermittently.
3. the fuel supplying device of internal-combustion engine according to claim 1, it is characterized in that, when described control unit carries out fuel pressure control in the stipulated time when described starting, the discharge time that makes described Fuelinjection nozzle can change fuel pressure according to the internal combustion engine operation state not because of the internal combustion engine operation state changes.
4. the fuel supplying device of internal-combustion engine according to claim 1, it is characterized in that, when described control unit carries out fuel pressure control in the stipulated time when described starting, make described fuel pressure not because of the internal combustion engine operation state changes, the discharge time of Fuelinjection nozzle can be changed according to the internal combustion engine operation state.
5. the fuel supplying device of internal-combustion engine according to claim 1 is characterized in that, is reduced to the control of the fuel pressure when running well after described control unit carries out making fuel pressure boost to pressure maximum when described starting gradually.
6. the fuel supplying device of internal-combustion engine according to claim 5 is characterized in that, described control unit carries out reducing gradually along with the reduction of fuel pressure the control of the discharge time of Fuelinjection nozzle when described starting.
7. the fuel supplying device of internal-combustion engine according to claim 1 is characterized in that, described Fuelinjection nozzle comprises the spray-hole that has at least in the tapering that the downstream side sectional area enlarges.
8. the fuel supplying device of internal-combustion engine according to claim 7 is characterized in that, is radial and is formed with a plurality of spray-holes, and make the inclined of the described relatively Fuelinjection nozzle of its hole axle.
9. the fuel supplying device of internal-combustion engine according to claim 1 is characterized in that, comprises the fuel pressure sensor that detects described fuel pressure,
During the normal operation of described control unit after starting, carry out feedback control, make the actual fuel pressure that is detected reach target fuel pressure.
10. the fuel supplying device of internal-combustion engine according to claim 1 is characterized in that,
Described petrolift is can adjust the motor-drive pump of fuel ejection pressure according to driving electric power, and described control unit is controlled fuel pressure by the driving electric power of controlling described petrolift.
11. the fuel feeding method of an internal-combustion engine is characterized in that,
Fuel in the petrolift ejection fuel tank,
Supply with from the fuel of described petrolift ejection to Fuelinjection nozzle,
From described Fuelinjection nozzle to the internal-combustion engine fueling,
Detect the starting state of internal-combustion engine,
In when starting, the pressure of supplying with the fuel of described Fuelinjection nozzle from described fuel-injection pump is controlled to be high pressure when being higher than normal operation at the appointed time.
12. the fuel feeding method of internal-combustion engine according to claim 11 is characterized in that, in when starting fuel pressure is controlled under the state of high pressure, from Fuelinjection nozzle burner oil intermittently.
13. the fuel feeding method of internal-combustion engine according to claim 11, it is characterized in that, when carrying out fuel pressure control in the stipulated time when described starting, the discharge time that makes described Fuelinjection nozzle can change fuel pressure according to the internal combustion engine operation state not because of the internal combustion engine operation state changes.
14. the fuel feeding method of internal-combustion engine according to claim 11, it is characterized in that, when carrying out fuel pressure control in the stipulated time when described starting, make described fuel pressure not because of the internal combustion engine operation state changes, the discharge time of Fuelinjection nozzle can be changed according to the internal combustion engine operation state.
15. the fuel feeding method of internal-combustion engine according to claim 11 is characterized in that, when described starting, make fuel pressure boost to pressure maximum after, the control fuel pressure makes it be reduced to fuel pressure when running well gradually.
16. the fuel feeding method of internal-combustion engine according to claim 15 is characterized in that, described control unit carries out reducing gradually along with the reduction of fuel pressure the control of the discharge time of Fuelinjection nozzle when described starting.
17. the fuel feeding method of internal-combustion engine according to claim 11 is characterized in that, described Fuelinjection nozzle comprises the spray-hole that has at least in the tapering that the downstream side sectional area enlarges.
18. the fuel feeding method of internal-combustion engine according to claim 17 is characterized in that, is radial and is formed with a plurality of spray-holes, and make the inclined of the described relatively Fuelinjection nozzle of its hole axle.
19. the fuel feeding method of internal-combustion engine according to claim 11, it is characterized in that, during normal operation after the fuel pressure control in described when starting, detect the fuel pressure of supplying with described Fuelinjection nozzle, and carry out feedback control, make the actual fuel pressure that is detected reach target fuel pressure.
20. the fuel feeding method of internal-combustion engine according to claim 11 is characterized in that,
Described petrolift is can adjust the motor-drive pump of fuel ejection pressure according to driving electric power, controls fuel pressure by the driving electric power of controlling described petrolift.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003320621A JP2005090231A (en) | 2003-09-12 | 2003-09-12 | Fuel supply device for internal combustion engine |
| JP2003320621 | 2003-09-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1594848A true CN1594848A (en) | 2005-03-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100785130A Pending CN1594848A (en) | 2003-09-12 | 2004-09-10 | Fuel supply system and method for internal combustion engine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2005090231A (en) |
| CN (1) | CN1594848A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007247456A (en) * | 2006-03-14 | 2007-09-27 | Denso Corp | Fuel pump and its manufacturing method |
| JP5842642B2 (en) * | 2012-02-01 | 2016-01-13 | トヨタ自動車株式会社 | Fuel injection control device and fuel injection method for internal combustion engine |
| JP2017203417A (en) * | 2016-05-11 | 2017-11-16 | 三菱自動車工業株式会社 | Fuel injection device for engine |
-
2003
- 2003-09-12 JP JP2003320621A patent/JP2005090231A/en active Pending
-
2004
- 2004-09-10 CN CNA2004100785130A patent/CN1594848A/en active Pending
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| Publication number | Publication date |
|---|---|
| JP2005090231A (en) | 2005-04-07 |
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