CN102483001B - Fuel injector gains for subcritical flow compensates - Google Patents
Fuel injector gains for subcritical flow compensates Download PDFInfo
- Publication number
- CN102483001B CN102483001B CN201080038023.1A CN201080038023A CN102483001B CN 102483001 B CN102483001 B CN 102483001B CN 201080038023 A CN201080038023 A CN 201080038023A CN 102483001 B CN102483001 B CN 102483001B
- Authority
- CN
- China
- Prior art keywords
- fuel
- fuel injector
- pressure
- combustor
- subcritical flow
- 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
Links
Classifications
-
- 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
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/02—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with gaseous fuels
- F02D19/021—Control of components of the fuel supply system
- F02D19/023—Control of components of the fuel supply system to adjust the fuel mass or volume flow
- F02D19/024—Control of components of the fuel supply system to adjust the fuel mass or volume flow by controlling fuel injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/02—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with gaseous fuels
- F02D19/026—Measuring or estimating parameters related to the fuel supply system
- F02D19/027—Determining the fuel pressure, temperature or volume flow, the fuel tank fill level or a valve position
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
- F02D35/024—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure using an estimation
-
- 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
-
- 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
- F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/06—Fuel or fuel supply system parameters
- F02D2200/0602—Fuel pressure
-
- 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
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0275—Injectors for in-cylinder direct injection, e.g. injector combined with spark plug
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
-
- 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
Abstract
A kind of fuel gas direct-injection system (10) of the stroke piston combustion engine for motor vehicles, comprising: for the fuel tank (13) receiving fuel gas, fuel injector (20), it is calibrated by sound wave stream and is controlled by electronic control unit (ECU), described electronic control unit (ECU) controls the persistent period that ejector (20) is opened, and the point of the opening and closing of ejector (20) in engine operating cycle.ECU receives input signal and drive command from each sensor of the information providing the operational circumstances relating to electromotor, and determines the pressure reduction at fuel injector (20) two ends, to determine whether the state corresponding with the subcritical flow through fuel injector；Fuel injector is operated, to compensate this subcritical flow state with according to pressure reduction during generation subcritical flow state.
Description
Technical field
The present invention relates to the direct injection of the fuel gas of internal combustion engine.
Term " direct-injection " refers to use fuel injector to inject fuel directly in the combustor of internal combustion engine.
As it is used herein, term " fuel gas " refers to compressed gaseous fuel, such as compressed natural gas
And hydrogen (H (CNG)2), and liquefaction fuel gas, such as liquefied petroleum gas (LPG) and liquefaction
Natural gas (LNG).
Background technology
It is intended merely to facilitate below with reference to the discussion of background technology and understands the present invention.This discussion is not approved or holds
Recognize the part that any material being previously mentioned is the common knowledge during preference day such as the application.
For internal combustion engine, it is known that fuel gas has some and is better than liquid fuel (such as gasoline or diesel oil)
Advantage, especially with respect to cost and generation waste gas discharge for.Due to these advantages, increasingly become
To in using such fuel in internal combustion engine.
In some applications, especially for the electromotor of dilly, such as force aid rickshaw, motor
Car and scooter (scooter), fuel system utilizes the steam pressure of fuel gas by fuel gas
It is transported to fuel injector and subsequently fuel gas is exported electromotor, described combustion from fuel injector
Material ejector is additionally typically fuel delivery injector.This layout is favourable for cost, because
This layout makes to need not the petrolift for fuel gas is transported to fuel injector or other conveying
Mechanism.
The fuel gas of a certain amount of fuel injector then metered injection is in combustor.The gaseous state combustion of conveying
The amount of material can be the function opening the persistent period of ejector.
The LPG that fuel gas can e.g. be stored in fuel tank.Typically, a part of LPG with
Storage in liquid is in fuel tank, and the gaseous parts of LPG is stored in above liquid part.Fuel tank leads to
Crossing fuel feed pipe line to be connected with fuel tank, fuel feed pipe line is integrated has pressure regulator to regulate conveying
Supply pressure to the fuel gas of fuel injector.
The operation of fuel injector can be controlled beating of fuel injector by ECU control, ECU
Open the persistent period, time that fuel injector starts to open at relative to cycle of engine and fuel injection
The time that device begins to shut off relative to cycle of engine.ECU obtains input letter from various sensors
Number, and outputting a control signal to some engine components, wherein said sensor provides about electromotor
Mode of operation and the information of driver command.
The operation of fuel injector realizes by controlling device, to control the pressure at fuel injector two ends
Difference, this pressure reduction is the supply pressure of the fuel gas by fuel injector metered injection and corresponding combustor
The interior difference between main pressure.Therefore this pressure reduction be sprayed against sentencing of the actual amount of the fuel in combustor
Determining cause.
Fuel injector operates with throttle style when opening and is configured to carry at whole fuel gas
During promote sonic flow.The velocity of sound operation of fuel injector guarantees to occur fuel gas to combustor
Interior directly conveying, and unrelated with predominant gas pressure therein.If fuel injector is not at sonic flow
Operate under state, then can trade off course of conveying having influence on of fired downstream chamber pressure is transported in combustor
Clean fuel quantity.
For the directly injection of fuel gas, under light engine load state during such as idling, it will usually
Seek the fuel injection timing of delay.Desired around spark plug when delayed injection generally realizes igniting
Fuel distribution is favourable.But, in some such situations, such as may under cold mode of operation,
Especially when electromotor starts, and/or during low fuel gas level, the pressure reduction at fuel injector two ends can drop
As little as will there is the critical point of subcritical flow by fuel injector.
It addition, delayed injection timing is favourable under usual mode of operation, the increase of cylinder pressure can
Contribute to extending opereating specification or the dynamic range of fuel injector.But, in some states, conveying
Pressure will reduce, and produce the subcritical flow by fuel injector.
The fuel output characteristics changing fuel injector will be had by the subcritical flow of fuel injector
Effect, this output characteristics is calibrated according to sonic flow state.
The present invention is have developed based on this background technology and associated problem and difficulty.
Summary of the invention
It is contemplated that realize a kind of fuel injector, this fuel injector gaseous fuel is to internal combustion engine
Combustor in directly injection, and be operable to according to being prone to cause the Asia by fuel injector
The state of sonic flow to compensate discharge pressure and the chamber pressure of change.
According to the first aspect of the invention, it is provided that the controlling party of the fuel gas direct-injection system of electromotor
Method, described method includes: judge the pressure reduction at fuel injector two ends, to determine whether to occur and pass combustion
The state that the subcritical flow of material ejector is corresponding；Fire with according to pressure reduction operation during generation subcritical flow state
Material ejector, to compensate this subcritical flow state.
Utilizing this layout, the amount of the fuel gas being transported in the combustor of electromotor is fuel injector
Open the function of persistent period.
The fuel gas of injection can form the sole fuel demand for engine operating cycle.Or, spray
The fuel gas penetrated can by be transported to during engine operating cycle combustor other fuel dosage or
To other fuel dosage.
Preferably, the operation of fuel injector is controlled by controlling device such as ECU (ECU).Tool
Body ground, ECU judges the operating parameter of fuel injector.Described operating parameter can such as include that fuel sprays
Device open the persistent period, time that fuel injector starts to open at relative to engine operating cycle, combustion
Time that material ejector begins to shut off relative to engine operating cycle or their combination in any.
Preferably, discharge pressure and also the monitoring of ECU monitoring fuel gas indicates and follows relative to electromotor
The parameter of main pressure in the combustor of ring.In such manner, it is possible to assessment or at least approximate evaluation pressure reduction.
ECU can monitor gaseous state by the input received from the pressure transducer coupled with fuel injector
The discharge pressure of fuel.Pressure transducer can measure the gaseous state in the fuel nozzle being connected with fuel injector
The pressure of fuel.
In the case of stroke piston combustion engine, chamber pressure is as the letter of the piston position in cylinder
Count and change.Utilize such layout, monitored to provide for the sign of main pressure in combustor
Parameter can include the crank angle of electromotor.
When ECU refers to " lookup " mapping graph or table judges preset within the engine or moment
Typical main pressure in combustor.Typically, reception is indicated before top dead center (BTDC) crank by ECU
The signal of corner." search " mapping graph or table and will correspondingly there is the vertical coordinate of BTDC crank angle,
" search " mapping graph or table is output as the chamber pressure preset.So, for any specific
BTDC crank angle, ECU is by the expectation main pressure in judgement combustor.To this end, can determine that pressure
Difference, and if this pressure reduction be the level reflecting the subcritical flow state through fuel injector, then
ECU will regulate the operating parameter of fuel injector to compensate this subcritical flow state.Specifically, fuel spray
The persistent period of opening of emitter is modified according to " lookup " mapping graph or table, time wherein for opening lasting
Between regulation carry out according to the pressure reduction at fuel injector two ends.
In the finest system, " lookup " mapping graph or table will have BTDC crank angle ratio and drive
The person's of sailing instruction or the ratio vertical coordinate of throttle angle (spending), or BTDC crank angle compares manifold
The vertical coordinate of pressure (kPa absolute value), and " lookup " mapping graph or table are output as the burning preset
Chamber pressure.If able to the intake air temperature in judgement motor intake manifold, then this intake air temperature can
Be further used for revising the default chamber pressure for a certain BTDC crank angle, then can be the most smart
Really judge chamber pressure.
In another is arranged, it is possible to indicated by monitoring by using the calculating of known air-flow formula
Subcritical flow state is judged relative to the parameter of main pressure in the combustor of engine operating cycle.
According to the second aspect of the invention, it is provided that controlled by method according to the first aspect of the invention
Fuel gas direct-injection system.
According to the third aspect of the invention we, it is provided that have by method control according to the first aspect of the invention
The electromotor of the fuel gas direct-injection system of system.
According to the fourth aspect of the invention, it is provided that for the fuel gas direct-injection system of electromotor, this spray
The system of penetrating includes: judge that the pressure reduction at fuel injector two ends is to determine whether to occur and through fuel injector
The device of state corresponding to subcritical flow；Fuel is operated with according to pressure reduction during generation subcritical flow state
Ejector is to compensate the device of this subcritical flow state.
According to the fifth aspect of the invention, it is provided that for the fuel gas direct-injection system of electromotor, this spray
The system of penetrating includes: for the fuel injector being directly injected in combustor by fuel gas；Judge fuel
The pressure reduction at ejector two ends is to determine whether the shape corresponding with the subcritical flow through fuel injector
The device of state；Fuel injector is operated to compensate this subsonics with according to pressure reduction during generation subcritical flow state
The device of speed stream mode.
According to the sixth aspect of the invention, it is provided that there is the electromotor of fuel gas direct-injection system, this spray
The system of penetrating includes: judge that the pressure reduction at fuel injector two ends is to determine whether to occur and through fuel injector
The device of state corresponding to subcritical flow；Fuel is operated with according to pressure reduction during generation subcritical flow state
Ejector is to compensate the device of this subcritical flow state.
Accompanying drawing explanation
With reference to below for as the figures show, the description of a specific embodiment of the present invention, will
It is more fully understood that the present invention, in the drawings:
Fig. 1 is the schematic diagram of the fuel gas direct-injection system according to present embodiment；With
Fig. 2 is equipped with the combustion of the conventional engine of the fuel gas direct-injection system according to the present invention
Burn the chamber pressure curve chart relative to crank angle.
Detailed description of the invention
In entire disclosure and claims, unless the context requires otherwise, word " includes "
Or the deformation of its different tenses will be understood to refer to integer or the integer group specified, but is not excluded for arbitrarily
Other integer or integer group.
Embodiment shown in accompanying drawing relates to the stroke piston combustion engine of vehicle (not shown)
Fuel gas direct injected fuel system 10, described vehicle can be typically dilly, such as power-assisted manpower
Car, motorcycle or scooter.
About the use of liquefaction fuel gas, present embodiment will be described；Specifically about the use of LPG
It is described.However, it is understood that the most suitable fuel gas can be used about the present invention.
Fuel system 10 includes the fuel tank 13 for receiving fuel gas, gaseous state in the present embodiment
Fuel includes LPG.LPG is stored in case 13 with liquefaction.Although LGP stores with liquefaction
In fuel tank 13, a part of LGP is present in above liquefaction LPG with gaseous state in fuel tank.
LPG is transported to fuel conduit 15 along fuel feed pipe line 17.Pressure regulator 19 is incorporated into
In burning line 17, it is supplied to the supply pressure of the LPG of fuel conduit 15 with regulation.
In the present embodiment, electromotor is multicylinder engine, and fuel gas by with fuel conduit 15
The fuel injector 20 connected is directly injected in each cylinder of electromotor in the combustor limited.
As conventional practice, fuel injector 20 is configured to be in when open throttle, i.e. combustion
Material ejector 20 is calibrated for sonic flow.
The operation of fuel injector 20 is controlled by ECU (not shown).ECU (ECU)
Can control the operating parameter of each fuel injector 20, particularly ejector 20 opens the persistent period,
And the time point that ejector 20 opens and closes in engine operating cycle.
ECU receives input signal from each sensor, and these signals provide the mode of operation with electromotor
The information relevant with driver command.ECU exports each control signal, includes especially spraying with fuel
The control signal that the operation of device 20 is correlated with.
The sensor providing information to ECU includes evaporation state LPG in sensing fuel conduit 15
The pressure transducer 18 of pressure.In other words, pressure transducer 18 monitoring is transported to fuel injector
The discharge pressure of evaporation state LPG of 20.
Then ECU can correspondingly change the operating parameter of fuel injector 20, is used for controlling with metering
The air-fuel ratio of the fuel mixture in corresponding engine cylinder and realize receivable performance, flameholding
The fuel gas amount of the injection required by property and emission control.
ECU is by controlling the operating parameter of each fuel injector of following Parameters variation 20: fuel sprays
Device 20 open the persistent period；Fuel injector 20 relative to engine operating cycle start to open at time
Between；The time that fuel injector 20 begins to shut off relative to engine operating cycle；Or appointing of they
Meaning combination.
Outside monitoring puts on the discharge pressure of each fuel injector 20, ECU additionally monitors sign
Relative to the parameter of main pressure in each combustor of engine operating cycle.In such manner, it is possible to assessment or
At least pressure reduction at approximate evaluation each fuel injector 20 two ends.
In the present embodiment, monitored parameter includes that the BTDC crank in engine operating cycle turns
Angle, because it is relevant to engine cylinder.
ECU judges combustion during Preset Time in engine operating cycle with reference to " lookup " mapping graph or table
Burn indoor typical case's main pressure.Specifically, ECU receives the signal indicating BTDC crank angle." look into
Look for " mapping graph or table have the vertical coordinate of BTDC crank angle, " lookup " mapping graph or the output of table
For default chamber pressure.So, for the most particularly BTDC crank angle, ECU can sentence
Expectation main pressure in each combustor fixed.According to this information and as measured in fuel conduit 15
The relevant information of discharge pressure to evaporation state LPG, it is possible to the pressure at judgement fuel injector 20 two ends
Difference.
Chamber pressure relevant from different BTDC crank angles, prediction is by carrying out about electromotor
Bench test judge.
As BTDC crank angle, " lookup " mapping graph or table it be also possible to use driver command or joint
Valve angle (spending) is as other vertical coordinate, or uses engine manifold pressure (kPa absolute value),
And as the output class of " lookup " mapping graph or table, it is the chamber pressure of prediction.By judging electromotor
Intake air temperature in inlet manifold, then revises for a certain BTDC crank further by this intake air temperature
The prediction chamber pressure of corner, then can more precisely predict chamber pressure.
Generally, in fuel gas carries, each fuel injector 20 operates to promote with throttle
Sonic flow.The velocity of sound operation of fuel injector 20 guarantees to be delivered directly to fuel gas accordingly
In combustor, and unrelated with the predominant gas pressure in combustor.If fuel injector 20 is not at sound
Operate under speed stream mode, then the downstream pressure of combustor can undermine fuel conveying and impact is transported to burning
The actual amount (net amount) of the fuel of room.
In the operating process of electromotor, ECU judges the pressure reduction at each fuel injector 20 two ends.False
If the pressure reduction at fuel injector 20 two ends is in the level corresponding with sonic flow state, then need not remedy
Action.
In the certain operations state of electromotor, this pressure reduction can be reduced to reflect the water of subcritical flow state
Flat.A kind of it may happen that the situation of this state is following situation: at (such as) cold mode of operation, more
Discharge pressure in the fuel conduit 15 specifically occurred in cold state reduces, in these states
Middle fuel tank vapor pressure is low and/or there is low fuel gas level and causes the vapour pressure of LPG
Power reduces, and ultimately results in the subcritical flow through fuel injector 20.This state of alternatively possible generation
Situation be require for fuel stability postpone fuel injection timing situation；Such as, light at electromotor
When carrying such as idling.Later injection timing is typically equivalent to when spray site exist higher combustor
Pressure, thus makes the pressure reduction at each fuel injector 20 two ends reduce, and may cause passing through fuel
The subcritical flow of ejector 20.
Fig. 2 is the diagram chamber pressure curve chart relative to the crank angle of engine cylinder.At Fig. 2
In, the chamber pressure as cylinder pressure is stated by the line drawing being denoted as reference 21.It addition, with
Fueling injection pressure discharge pressure corresponding, in fuel conduit 15 is by the line being denoted as reference 23
Describe.In shown layout, in the fueling injection pressure described by line 23 and the combustion described by line 21
The pressure reduction burnt between chamber pressure promotes at two songs shown in the dotted line indicated by reference 25 and 27
The subcritical flow state occurred in band between handle corner.
It should be noted that, additionally it is possible to judge that the wherein generation for different fuel expulsion pressure is sub-by calculating
The band of sonic flow state.Such as, in diagram shown in fig. 2, judge line 29 by such calculating,
And the intersection point of line 29 and line 23 determined the starting point of the band that subcritical flow wherein occurs, specifically by void
Line 25 indicates.Thus it will be apparent that such as higher fueling injection pressure, wherein there is Asia
The band of sonic flow will move right in fig. 2, because line 23 (sign fueling injection pressure) will thus exist
Along the line 29 and line 21 (sign cylinder pressure) more high point at intersect with line 29 and line 21.That is, right
In higher fueling injection pressure, subcritical flow Tape movement is with in engine operating cycle
TDC, otherwise for lower fueling injection pressure then.
The level of reflection subcritical flow state it is at the pressure reduction each fuel injector 20 two ends being detected
Time, the operating parameter of ECU regulation fuel injector 20, to compensate this subcritical flow state.Usually,
ECU opens the persistent period by change fuel injector 20, so that the fuel gas of appropriate amount can be carried,
Thus realize the fuel stability of aspiration level.
Continue more specifically, revise opening of fuel injector 20 according to " lookup " mapping graph or table
Time, carry out for opening the pressure reduction that the persistent period regulates according to fuel injector 20 two ends；That is,
In subsonic speed region, pressure reduction is the lowest, then the persistent period of opening of fuel injector 20 is more extended.
Change the purpose opening the persistent period of fuel injector 20 to be to keep identical and be transported to electromotor vapour
" the aim parameter fuel " of cylinder (if i.e., pressure reduction denotes sonic flow, then hold by opening of fuel injector
The continuous time can be Y millisecond, and when pressure reduction indicates subcritical flow, then opening of fuel injector continues
Needs are ＞ Y milliseconds by the time).Desired " lookup " mapping graph or table extend injection for principal states
Persistent period, to keep same amount of fuel stream (and therefore keeping the target air-fuel ratio in combustor).
And, the transformation in course of injection it may happen that between sonic flow and subcritical flow.Such
In situation, in " lookup " mapping graph or table, the value of reference can be sprayed by the fuel when this concrete time
The value of the midpoint of the pulsewidth of emitter 20 judges.
According to foregoing teachings, it will be apparent that, present embodiments provide for simpler and unspent, in order to mend
Repaying the layout of the subcritical flow state occurred in fuel injector, described fuel injector arrangement becomes gaseous state
Fuel is directly injected in engine cylinder.Present embodiment is relative to the crank angle pair of engine cylinder
Chamber pressure models, thus ECU can estimate the main pressure in combustor in each course of injection
Power and do not require to carry out concrete calculating (this calculating will need significant process ability).Calibration operation energy
Enough carry out typically via bench test, thus require only to reduce into by the ECU during power operation
Only with reference to " lookup " mapping graph or table.
Should be understood that the scope of the present invention is not limited to the scope of described embodiment.
Although describing present embodiment using LPG as fuel gas, it should be appreciated that the present invention can
Being applied to arbitrarily other liquefaction fuel gas, described fluid fuel gas includes liquefied natural gas
, and compressed fuel gas such as compressed natural gas (CNG) and hydrogen (H (LNG)2)。
It addition, in the embodiment shown, the whole fuel up demand of LPG composition electromotor；That is,
Only using LPG is combustion process fuel up.In other embodiments, LPG (or other gaseous state
Fuel) can be to being transported to other fuel dosage of combustor in engine operating cycle or by other fuel
Dosage.Other fuel described will carry typically via single course of conveying.By direct-injection process
Carrying in the case of other fuel, it can be carried by single fuel injector.
Although it addition, just (and not requiring to perform concrete meter in each course of injection by modeling
Calculate) it is estimated describing present embodiment to the main pressure in combustor, it should be appreciated that wherein often
Individual course of injection is measured parameter specifically calculating and judges being arranged in of chamber pressure of reality
In the scope of the present invention.
Claims (17)
1. the control method of the fuel gas direct-injection system of electromotor, described method comprises determining that fuel sprays
The pressure reduction at emitter two ends, to determine whether the shape corresponding with the subcritical flow through fuel injector
State；Fuel injector is operated, to compensate this subcritical flow with according to pressure reduction during generation subcritical flow state
State,
Wherein, controlling the operation of fuel injector by controlling device, described control device operates as determining
The operating parameter of fuel injector, and
Wherein, it is in, at described pressure reduction, the level that the subcritical flow state of described fuel injector is flow through in reflection
Situation in, described control device regulate described fuel injector operating parameter to compensate described subsonic speed
Stream mode.
Method the most according to claim 1, wherein, described operating parameter includes fuel injector
Open the persistent period.
Method the most according to claim 1 and 2, wherein, described operating parameter includes or further
Including: the time that fuel injector is opened relative to engine operating cycle.
Method the most according to claim 1 and 2, wherein, described operating parameter includes or further
Including: the time that fuel injector cuts out relative to engine operating cycle.
Method the most according to claim 1, wherein, described operating parameter is constituted from by following parameter
Group in select: fuel injector open the persistent period；Fuel injector follows relative to power operation
The time that ring is opened；And the time that fuel injector cuts out relative to engine operating cycle.
Method the most according to claim 1, wherein, described control device monitoring fuel gas defeated
Pressurization pressure and sign are about the parameter of pressure in the combustor of cycle of engine.
Method the most according to claim 6, wherein, described control device is by spraying from fuel
The transmission pressure of fuel gas is monitored in the input that the pressure transducer of device association receives.
Method the most according to claim 7, wherein, described pressure transducer is measured and is sprayed with fuel
The pressure of the fuel gas in the fuel conduit that device connects.
Method the most according to claim 6, wherein, described control device maps with reference to " lookup "
The typical pressure in combustor when figure or table determine the Preset Time in cycle of engine.
Method the most according to claim 6, wherein, electromotor includes stroke piston combustion engine,
During the operation of this stroke piston combustion engine, chamber pressure becomes according to piston position in cylinder
Change, and wherein, include starting about the parameter of the sign of pressure in combustor to provide for monitored
The crank angle of machine.
11. methods according to claim 9, wherein, described control device receives and indicates top dead-centre
The signal of front crank angle, and wherein said " lookup " mapping graph or table include that before top dead center crank turns
The vertical coordinate at angle is can determine the chamber pressure of prediction.
12. methods according to claim 11, wherein, described control device can be for the most special
Fixed before top dead center crank angle determines the expecting pressure in combustor, wherein based on described any specific
Before top dead center crank angle can determine pressure reduction.
13. methods according to claim 12, wherein, described control device is by " looking into according to described
Look for " mapping graph or table revise persistent period of opening of described fuel injector and regulate operating parameter, wherein
The persistent period is opened in pressure reduction regulation according to described fuel injector two ends.
14. methods according to claim 1, wherein, by using the meter of known air-flow formula
Calculate and determine that subcritical flow state occurs.
15. 1 kinds by the fuel gas controlled according to the method according to any one of claim 1-14
Direct-injection system.
16. 1 kinds of gaseous states having by controlling according to the method according to any one of claim 1-14
The electromotor of direct fuel injection system.
The fuel injection system of 17. 1 kinds of electromotors, described fuel injection system includes: for by gaseous state
Fuel is directly injected to the fuel injector in combustor, and described fuel injection system is by wanting according to right
The method according to any one of 1-14 is asked to control.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2009903046A AU2009903046A0 (en) | 2009-06-30 | Fuel Injector Gain Compensation for Sub-Sonic Flow | |
| AU2009903046 | 2009-06-30 | ||
| PCT/AU2010/000828 WO2011000043A1 (en) | 2009-06-30 | 2010-06-30 | Fuel injector gain compensation for sub-sonic flow |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102483001A CN102483001A (en) | 2012-05-30 |
| CN102483001B true CN102483001B (en) | 2016-11-16 |
Family
ID=43410368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201080038023.1A Expired - Fee Related CN102483001B (en) | 2009-06-30 | 2010-06-30 | Fuel injector gains for subcritical flow compensates |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN102483001B (en) |
| BR (1) | BRPI1015944A2 (en) |
| WO (1) | WO2011000043A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9644556B2 (en) * | 2013-05-31 | 2017-05-09 | Ford Global Technologies, Llc | Gaseous fuel injector activation |
| EP2930336A1 (en) * | 2014-04-10 | 2015-10-14 | Repsol, S.A. | LPG direct injection engine |
| DE102015210482A1 (en) * | 2015-06-09 | 2016-12-15 | Robert Bosch Gmbh | Gas supply arrangement of a gas internal combustion engine |
| CN111140403B (en) * | 2019-12-30 | 2021-05-18 | 潍柴动力股份有限公司 | Flow compensation method, device and equipment of gas injection valve |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1871424A (en) * | 2003-09-30 | 2006-11-29 | 韦斯特波特研究公司 | Method for injecting gaseous fuels into an internal combustion engine at high pressures |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040103877A1 (en) * | 2000-12-01 | 2004-06-03 | Mccoy James J. | Supersonic injector for gaseous fuel engine |
| JP2007051589A (en) * | 2005-08-18 | 2007-03-01 | Denso Corp | Fuel injection device for internal combustion engine |
| WO2007087685A1 (en) * | 2006-02-02 | 2007-08-09 | Orbital Australia Pty Ltd | A gaseous fuel injection system |
-
2010
- 2010-06-30 CN CN201080038023.1A patent/CN102483001B/en not_active Expired - Fee Related
- 2010-06-30 BR BRPI1015944A patent/BRPI1015944A2/en not_active IP Right Cessation
- 2010-06-30 WO PCT/AU2010/000828 patent/WO2011000043A1/en active Application Filing
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1871424A (en) * | 2003-09-30 | 2006-11-29 | 韦斯特波特研究公司 | Method for injecting gaseous fuels into an internal combustion engine at high pressures |
Also Published As
| Publication number | Publication date |
|---|---|
| BRPI1015944A2 (en) | 2016-04-19 |
| WO2011000043A1 (en) | 2011-01-06 |
| CN102483001A (en) | 2012-05-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100432401C (en) | Method of determining cetane number of fuel in internal combustion engine | |
| US7444986B2 (en) | Dual fuel engine | |
| US7219650B2 (en) | Control apparatus of fuel injection type internal combustion engine | |
| CN101963113B (en) | Engine and control method thereof | |
| CN100414085C (en) | Control device of internal combustion engine | |
| CN101245741B (en) | Fuel injection controller and fuel injection control system | |
| CN103154485B (en) | Determine the method for duration of charge in vaporized fuel explosive motor | |
| US9334813B2 (en) | Control system for a dual-fuel engine | |
| US20120109496A1 (en) | Fuel injection system | |
| CN101400887A (en) | Method of accurately metering a gaseous fuel that is injected directly into a combustion chamber of an internal combustion engine | |
| CN101918698A (en) | Super cooled air and fuel induction system for internal combustion engines | |
| CN104141548A (en) | DIRECT INJECTION OF DILUENTS OR SECONDARY FUELS IN GASEOUS FUEL ENGINEs | |
| MX2015000297A (en) | Systems and methods for determining amount of liquid and gaseous fuel. | |
| CN102483001B (en) | Fuel injector gains for subcritical flow compensates | |
| CN104110328A (en) | Enhanced Fuel Injection Based On Choke Flow Rate | |
| CN104033256A (en) | Control system and method of oil and gas dual-fuel engine with oil supplied by mechanical pump | |
| CN105275615A (en) | Method for controlling an internal combustion engine | |
| AU2016361663B2 (en) | A multi-fuel engine and method of controlling the same | |
| CN109715925A (en) | Engine | |
| KR100865296B1 (en) | The supply system of gas fuel using a gas injection method in cars | |
| Misul et al. | Fluid-dynamic modeling and advanced control strategies for a gaseous-fuel injection system | |
| JP4876903B2 (en) | Control device for multi-fuel internal combustion engine | |
| JP2016217330A (en) | Fuel injection controller of internal combustion engine | |
| CN114729613A (en) | Gas ultrasonic transducer system and method for operating a diesel common rail engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180930 Address after: 31, 1-3 floor, Shuguang garden, Qinzhou hi tech Industrial Development Zone, the Guangxi Zhuang Autonomous Region Patentee after: Guangxi Yinyi Power Technology Co.,Ltd. Address before: Western Australia, Australia Patentee before: Orbital Australia Pty Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161116 |