CN101205859B - Specification-based fuel pump controlling method - Google Patents
Specification-based fuel pump controlling method Download PDFInfo
- Publication number
- CN101205859B CN101205859B CN2007103009417A CN200710300941A CN101205859B CN 101205859 B CN101205859 B CN 101205859B CN 2007103009417 A CN2007103009417 A CN 2007103009417A CN 200710300941 A CN200710300941 A CN 200710300941A CN 101205859 B CN101205859 B CN 101205859B
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- CN
- China
- Prior art keywords
- fuel
- pump
- pumping
- cam
- oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
- F02M59/10—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by the piston-drive
- F02M59/102—Mechanical drive, e.g. tappets or cams
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/406—Electrically controlling a diesel injection pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
- F02M59/366—Valves being actuated electrically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/31—Control of the fuel pressure
-
- 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
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The present invention provides a method for supplying pressured fuel to the fuel injection system of the multicylinder engine by a controlled demand fuel pump. The pump includes crank driving pumping unit, supplying fuel by inlet control valve. In the preferable embodiment, the method comprise a cam supplying even pump pumping protrude angle, operably producing pumping unit stroke to transmit fuel to the system pump and maintaining the minimum oil pressure by invalidation of the pumping effect of the selective protruding angle to reduce fuel transmission when then cam is not needed. The invalid protruding angle is selected to maintain the continuous pumping rhyme of the valid pumping protruding angle. Other additional characteristic is also claimed.
Description
Technical field
The present invention relates to internal-combustion engine and more properly relate to the method that a kind of control is used for the specification-based fuel pump of this motor.
Background technique
As well known to those skilled in the art, utilize a pumping enough oil to replace the efficient that motor circulates and can improve fuel oil supply system based on specification-based fuel pump with oily at every turn.The unnecessary fuel oil that this pump provides returns by effective digital control valve or the inlet side of this pump is returned in bypass.Pressure is lower and expend that it enters the hydraulic pressure energy that lacks the high pressure side than pumping herein.Oil pressure in the engine nozzle fuel rail can pump into the amount of fuel in the fuel rail and the inlet that unnecessary amount is returned pump controlled by increase.By can keep the pressure of expectation from the closed-loop feedback of fuel rail pressure sensor, when the pressure transducer indication reaches a kind of steady state in the oil mass that pumps into rail with between the oil mass of rail ejection.
The general type of specification-based fuel pump comprises by the direct reciprocal single plunger of the salient angle on the camshaft of engine valve system.In this example, the peaked parameter that can pump into the amount of fuel in the rail under many definite high engine load is arranged:
1) how much discharge capacities of pump;
2) the cam lobe event number of each engine cycles;
3) maximum lift of cam lobe;
4) pump volumetric efficiency.
These maximum pump capacity parameters determine that based on motor maximum fuel demand this maximum fuel demand is the function of following engine parameter basically:
1) biggest quality air rate;
2) the fuel oil enriching is demarcated demand.
In the motor underload, especially under the situation of idling, have many parameter limit pump into fuel rail minimum non-zero oil mass stability and, the stability of oil pressure control.These parameters comprise:
1) minimum mass air rate;
2) the fuel oil enriching is demarcated demand;
3) cam lobe event number;
4) timing of significant figure control valve and camshaft is synchronous;
5) camshaft timing changes;
6) cam lobe lift profile;
7) the pump internal leakage changes.
Generally when hanging down load, provide pressure stable that challenge is arranged to the need-based pumping system.This problem of motor for the dynamic supplying fuel scope of height is increased, for example turbosupercharging and lean combustion engine.Expectation has the method that the demand pumping system is improved the oil pressure stability when hanging down load.
Summary of the invention
The invention provides a kind of method, this method has increased the dynamic range and the pressure control stability of need-based fuel oil supply system, and the operational stability that improvement is provided under low load, especially idling.
Broadly the method comprising the steps of:
Control is used for supplying with to the fuel injection system of multicylinder engine the specification-based fuel pump of pressurization fuel oil, and this pump has the cam drive pumping element of supplying with fuel oil through inlet control valve.Optionally adopting cam-actuated reciprocating piston pump in the example, this method comprises:
Cam with a plurality of pumping salient angles is provided, and this pumping salient angle can be operated with the stroke that produces pumping element with to system's pumping fuel; With
When transmitting to keep the minimum oil pressure in the system by the pump action of selecting salient angle being lost efficacy reduce fuel oil when not required, wherein the inefficacy of the pump action of selected pumping element is by described inlet control valve is opened so that the unnecessary oil mass of pump stroke is back to entrance pipe realizes.In a preferred embodiment, can select to lose efficacy salient angle to keep the coherent pumping rhythm of effective pumping salient angle.
For 4,6, in the exemplary embodiments of 8 Cylinder engines, the quantity of cam lobe can be 4.When only needing two effective salient angles, reduce fuel delivery by 3 in the pump action of 2 salient angles in 4 salient angles that lost efficacy and 4 salient angles that when only needing an effective salient angle, lost efficacy.The inefficacy of selected salient angle can be opened and realizes by keeping the inlet control valve at the pumping element of the salient angle of selecting to be used to lose efficacy as the time spent, so that the fuel flow returns that selected salient angle is carried is to the inlet side of pump.
Control valve is electronic, for example passes through solenoid.For the salient angle number selecting to remain valid and obtain the wide range of oil pressure stability, controller can provide the selected predetermined and variable operational condition of responding engine and drive this control valve at the motor run duration.
From the description of in conjunction with the accompanying drawings specific embodiment of the present invention, all feature and advantage of the present invention will more fully be understood.
Description of drawings
Fig. 1 is the schematic representation according to the mechanically actuated element of typical specification-based fuel pump of the present invention system;
Fig. 2 is the typical control operational block diagram, and it is programmed the cam lobe number to select to be used for to move under predetermined condition; And
Fig. 3 is the chart of indication mode, and wherein fuel control system is provided in this mode by the fuel rail pressure that is provided by specification-based fuel pump with control.
Embodiment
At first with reference to figure 1, numeral 10 general expressions have the internal-combustion engine of the camshaft 12 of crank-driven, and wherein camshaft 12 comprises the fuel pump cam 14 with 4 effect salient angles 16 that equidistantly separate along the cam circumference.This motor further comprises the reciprocal fuel pump 18 with cylinder limitative aspect 20, reciprocal driven plunger 22 in cylinder limitative aspect 20.The roller follower 24 that is installed in pistons end engages with cam lobe 16 and be used for making reciprocating motion of the pistons when engine-driven camshaft rotates.
The pump housing 20 comprises and exports 28 with the inner inlet that is connected 26 of pump cylinder (not shown).Outlet 28 is connected with one-way valve 30, one-way valve 30 and export pipeline 32 connections of leading to relevant engine spray fuel rail (not shown).26 upstreams that enter the mouth are connected with control valve 34, and this control valve is driven by solenoid 36 and the fuel gallery of entrance pipe 38 is flowed back in its control from the pump housing 20.Entrance pipe is by the low pressure pump fuel feeding that is connected with the oil tank of vehicle (not shown).
The operation of oil pump can be by one or more suitable controller controls.For example, the controller 40 shown in Fig. 2 has been described selection to effective cam lobe number to be used for the operation of fuel pump under the various generator operating conditions.
The engine sensor reading of controller 40 combination expression manifold absolute pressure (MAP) and engine speed (RPM) 44 is with calculation engine load 46.Minimum essential requirement oil pressure 48 in the fuel rail that will determine by current runnability, the current oil pressure 50 of measurement and each oil mass of supplying with 52 of spraying combine with engine loading to be identified for the cam lobe minimum number that the present engine operation conditions is remained valid required in calculating 53, select 54 thereby produce.
Then with reference to figure 3, chart 56 is represented the control mode that the fuel pump fuel oils transmit.Jaggies 58 ordinary representations are finished the reciprocating of the four-stroke piston of the each circuit of motor with respect to crank shaft angle.Line 60 is delineated out the shadow-free part 61 of stroke of piston S, and wherein fuel filler control valve 34 is opened, and allows to flow into or reflux.Close on line 60, shadow zone 62 expression valves 34 cut out and time period of stoping backflow, and fuel oil supplies to fuel rail by one-way valve 30 and export pipeline 32 effective length L or pump stroke displacement is shown.Dashed line under the shadow zone illustrates the non-pumping part of stroke of piston S.Effective stroke length can change to any desired part of stroke S from the full stroke S of piston to be controlled at the average fuel pressure that maintains under the various operations of motor the fuel rail.
The operation of system is as described below.During engine start, motor start rotating cam axle 12, impel cam lobe 16 reciprocating piston pump 22 in the pump housing 20.Control valve is closed during control valve 36 during the pump induction stroke 64 is opened and had selected effective pump stroke 66 of length L.In induction stroke, open piston when valve 36 and fuel oil is sucked the pump housing from entrance pipe 38.In effective pump stroke, piston 22 forces fuel oil to discharge the pump housing and flows into export pipelines by one-way valve 30 when control valve 36 is closed.This valve keeps cutting out up to pump providing enough fuel oils to flow to relevant injected fuel rail (not shown) by export pipeline 32 in pump stroke, so that boost in pressure to the fuel-injected of fuel rail is determined pressure minimum.
When engine start, control by reducing through the amount of fuel of one-way valve 30 on demand from the fuel outlet pressure that pump flows out, the suitable mean flowrate of oil mass of cylinder (not shown) is provided and spurts into the motor run duration in instantaneous operational condition.This control is dual.At first, controller 40, in the mode of previous expression, determine under present case for keep oil pressure essential in essential fuel flow and the port fuel rail the quantity of the cam lobe that must use, and count operation system with required cam lobe.Secondly, the oil mass of being supplied with by pump during each pump stroke is reduced, and this may be essential, and this minimizings is opened by digitizing shake-up control valve 34 and is back to entrance pipe with the oil mass that pump stroke is unnecessary and realizes.This causes only has required amount of fuel from the pump housing 20 actual export pipelines 32 that pump into.Like this, the average fuel flow of inflow fuel rail is controlled to keep oil pressure suitable in the rail under steady state and variable engine runnability.
In instantiation, during idle, controller 40 operations are to determine only to need cam lobe 16 pumping fuels to keep the minimum oil pressure in the injected fuel rail.Therefore, control valve 36 is kept in all induction strokes of pump piston and four pump stroke three and is opened, and the fuel flow returns of pumping is to entrance pipe 38 and do not supply to pressurization export pipeline 32 during this period.
During the 4th stroke, the fuel oil of the suction pump housing 20 by the digitizing of control valve 36 open partly be back to entrance pipe 38 with will the expectation oil mass flow back to entrance pipe 38.This control concept is illustrated by line 60 in Fig. 3, and it has described the operation with two effective pumping salient angles.Piston from 0 during the initial movement of line 60 this control valve stay open, fuel overflow is to entrance pipe during this period.In all the other strokes of the 4th stroke, for can keep essential pressure in the injected fuel rail, the end that control valve 36 is closed to pump stroke flows to export pipeline 32 by one-way valve 30 with the oil mass of needs so that time enough to be provided under pressure.
When engine speed and load increased, the quantity that controller 40 moves effective pump stroke that pump is produced as required was increased to two from one, generates operating mode shown in Figure 3.When needs more when high-engine power and speed, effectively the quantity of pump stroke rises to 4 of 3 of each engine cycles or maximum values.In all cases, the concrete output of each effective pump stroke is equated with the fuel oil that is ejected into the cylinder from the fuel rail sucking-off during the steady state pressure situation to keep the fuel oil that flows into fuel rail substantially by the digital controller control of control valve 36.
When pump operates in low load operation under the effective situation of all pump stroke, when especially idle, owing to need seldom amount of fuel and the variation of crankshaft speed and the operation that influences the valve of actual fuel supply volume, it is unstable that the numerically controlled output of piston may become during low load and low speed.The present invention can effectively reduce these and change, and wherein the major control of pumping fuel is operated by the quantity that changes effective cam lobe, and it has directly changed and the proportional nominal fuel oil output of the quantity of effective salient angle.Therefore, when effective salient angle reduced, the effect of the digital control variation of each pump stroke reduced pro rata.The result of system's operation provides stable oil pressure control thus in the gamut that motor is exported from the idling to the maximum.
In a preferred embodiment, fuel oil control can be simplified and improves by the coherent pumping rhythm of keeping effective pump stroke in all cases in fuel rail.Especially, each engine cycles adopts single effective pump stroke when idling and low load, and each engine cycles comprises two rotations of the bent axle on the foru cycle engine.Load on motor increases, and each engine cycles pump stroke rises to two, and when reaching the maximum load scope, stroke is increased to 4 in each pumping circulation.Therefore, in all cases, pump stroke occurs with the rotation of equally spaced engine crankshaft, thus can obtain oil pressure in the fuel rail repeat change and can more accurately and predictably finish for the injection control of cylinder.
Though can adopt suitable cam arrangement arbitrarily, but because large-scale 6 and the restriction of the pumping action speed when the engine cam base circle diameter (BCD) of 8-Cylinder engine, the minimum profile curvature radius that produces grinding process, maximum engine speed, pump efficiency, cam stress, maximum flow rate ability, four salient angles have been considered to represent current physical constraints on the single cam.Yet, if expectation, but notion of the present invention also comparable applications to cam or be used for multi lobepump with more salient angles.When keeping the rhythm that links up, the cam lobe number that is less than 4 can effectively reduce the chance that the cam lobe pumping events lost efficacy.Under the situation of 4 cam lobes, can be according in cam action event number minimizing fuel oil current control variation dyne two or four that lost efficacy.
Adopt the reciprocal pump of cam drive piston though the invention describes, the crank-driven pump of the employing other types that the present invention can be equal to, diaphragm pump for example, the pump that connecting rod driven pump and other bent axles in time drive.
Under the situation of 4 Cylinder engines, the 4-lobe formation provides the pump incident for each injection events during high capacity.This distribution will can repeat pressure distribution for each injection provides maximum, and it can reduce the needs of cylinder offset nozzle pulse width.Under the situation of 8-Cylinder engine, the 4-lobe formation will provide the pump incident for per twice injection.Therefore, in alternately cylinder, exist different oil pressure to distribute by firing order.If it also can provide acceptable injection control the size to fit of fuel rail, or it need carry out some biasings to injection pulse width every a cylinder.Under the situation of 6-Cylinder engine, the structure of 4-salient angle will provide the pump incident for per 1.5 injection events.If it can provide acceptable fuel Injection Control the rail size to fit, but it can be setovered by injection pulse width and improves.
Although the present invention has described the preferred embodiment of determining, need should be appreciated that in described the spirit and scope of the present invention and can carry out many changes.Therefore, the embodiment that the present invention is not disclosed limits, but comprises all scopes that word allowed of claim.
Claims (9)
1. control specification-based fuel pump and supply with the method for pressurization fuel oil to the multicylinder engine fuel injection system for one kind, this pump has the reciprocal pumping element of supplying with by the inlet control valve of crank-driven, and described method comprises:
Give a plurality of pump stroke that each engine crankshaft circulation provides the pumping element that actuator carries out with to system's pumping fuel; With
Thereby transmitted and kept minimum oil pressure required in the system to reduce fuel oil when the pump action of the pumping element by making selection when not required loses efficacy;
Wherein the inefficacy of the pump action of selected pumping element is by described inlet control valve is opened so that the unnecessary oil mass of pump stroke is back to entrance pipe realizes.
2. the method for claim 1, thus comprise further that when needing the transmission by reducing effective pumping element transmits keep described minimum oil pressure in system to reduce fuel oil.
3. the method for claim 1, wherein said actuator are that cam and pumping element with a plurality of pumping salient angles are by cam-actuated piston.
4. method as claimed in claim 3, its cam have the even number salient angle and select the inefficacy salient angle to keep the coherent pumping rhythm of effective pumping salient angle.
5. method as claimed in claim 4, wherein said cam lobe number are 4 and by making 23 inefficacies in 4 salient angles of losing efficacy and make when only needing 1 effective salient angle in 4 salient angles reduce the fuel oil transmission when only needing 2 effective salient angles.
6. the method for claim 1, wherein control valve is electronic and can operates to keep during the selected portion of the pump action of paralysis period of any inefficacy pumping element and any effective pumping element and open.
7. the method for claim 1 comprises the pumping element number of controller to select at the motor run duration to remain valid that can respond selected predetermined and variable operation condition.
8. method as claimed in claim 7, wherein selected condition comprises engine loading, the instruction oil pressure detects oil pressure and each fuel oil quality that sprays.
9. method as claimed in claim 8 further comprises the maximum engine load, at least one condition in maximum fuel quality and the maximum oil pressure pressure reduction.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US61128506A | 2006-12-15 | 2006-12-15 | |
| US11/611285 | 2006-12-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101205859A CN101205859A (en) | 2008-06-25 |
| CN101205859B true CN101205859B (en) | 2011-02-23 |
Family
ID=39465969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007103009417A Expired - Fee Related CN101205859B (en) | 2006-12-15 | 2007-12-14 | Specification-based fuel pump controlling method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101205859B (en) |
| DE (1) | DE102007059731A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008051931A1 (en) * | 2008-10-16 | 2010-04-22 | Continental Automotive Gmbh | Injection system for an internal combustion engine |
| DE102012200764B3 (en) * | 2012-01-19 | 2013-07-11 | Continental Automotive Gmbh | Common rail injection system for an internal combustion engine |
| DE102015107921A1 (en) * | 2014-06-04 | 2015-12-17 | GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) | Systems and methods for controlling oil pumps |
| US10273945B2 (en) | 2014-07-31 | 2019-04-30 | Cummins Inc. | Mechanical fuel pump deactivation |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1179508A (en) * | 1996-04-17 | 1998-04-22 | 三菱电机株式会社 | Fuel injector |
-
2007
- 2007-12-12 DE DE102007059731A patent/DE102007059731A1/en not_active Withdrawn
- 2007-12-14 CN CN2007103009417A patent/CN101205859B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1179508A (en) * | 1996-04-17 | 1998-04-22 | 三菱电机株式会社 | Fuel injector |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102007059731A1 (en) | 2008-07-03 |
| CN101205859A (en) | 2008-06-25 |
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Granted publication date: 20110223 Termination date: 20111214 |