CN101871397B - Method for determining cetane number of fuel in no-load operation of internal combustion engine - Google Patents
Method for determining cetane number of fuel in no-load operation of internal combustion engine Download PDFInfo
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- CN101871397B CN101871397B CN201010135614.2A CN201010135614A CN101871397B CN 101871397 B CN101871397 B CN 101871397B CN 201010135614 A CN201010135614 A CN 201010135614A CN 101871397 B CN101871397 B CN 101871397B
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- fuel
- cetane number
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- supply
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
- F02D31/007—Electric control of rotation speed controlling fuel supply
- F02D31/008—Electric control of rotation speed controlling fuel supply for idle speed control
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- 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
- F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0602—Control of components of the fuel supply system
- F02D19/0607—Control of components of the fuel supply system to adjust the fuel mass or volume flow
- F02D19/061—Control of components of the fuel supply system to adjust the fuel mass or volume flow by controlling fuel injectors
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- 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
- F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0639—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
- F02D19/0649—Liquid fuels having different boiling temperatures, volatilities, densities, viscosities, cetane or octane numbers
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- 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
- F02D19/06—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/08—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 pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
- F02D19/082—Premixed fuels, i.e. emulsions or blends
- F02D19/085—Control based on the fuel type or composition
- F02D19/087—Control based on the fuel type or composition with determination of densities, viscosities, composition, concentration or mixture ratios of fuels
- F02D19/088—Control based on the fuel type or composition with determination of densities, viscosities, composition, concentration or mixture ratios of fuels by estimation, i.e. without using direct measurements of a corresponding sensor
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- 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
-
- 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
- F02D41/008—Controlling each cylinder individually
- F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- 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
- F02D2200/0611—Fuel type, fuel composition or fuel quality
- F02D2200/0612—Fuel type, fuel composition or fuel quality determined by estimation
-
- 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
- F02D2200/0614—Actual fuel mass or fuel injection amount
-
- 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
Abstract
The method involves determining a reference-fuel need as an average value of fuel supply over engine cycles during start of injection, where the fuel supply is adjusted by idle-speed controllers. A cetane number of currently burned fuel is determined by comparing a previously calculated difference with stored reference values or by calculating the cetane number of the currently burnt fuel from the previously calculated difference and a function. A difference between a reference-cetane number and the cetane number of the currently burned fuel is determined by the function. An independent claim is also included for an engine management system for determining a cetane number of fuel in no-load operation of an internal combustion engine.
Description
Technical field
The present invention relates to determine the method for the cetane number of fuel during thering is fuel and spray the idling of explosive motor of multiple cylinders wherein, and relate to the engine controller that is mounted to carry out described method.
Background technique
For the purposes of the present invention, diesel engine contained especially in term " explosive motor ", also comprises mixing explosive motor.Because limited as the raw-material oil deposition of fuel product, people think that utilizing interchangeable fuel and mixing explosive motor or mixed burning method is good idea increasingly extensively.Therefore, for the purposes of the present invention, all fuel that the operation of diesel engine may mainly rely on are called as diesel fuel or fuel.
Conventional diesel method is characterised in that air compressing, nonuniformity mixture, self ignition and quality control.
The necessary self ignition of fuel/air mixture requires diesel fuel to have extraordinary ignition quality.If fuel used ignition quality is too poor, the fuel/air mixture of a large amount of preparations concentrates in cylinder, and this causes the abrupt pressure in the time that burning starts to increase in self ignition event, maybe can not light a fire.
The ignition quality of fuel can be expressed as cetane number cn, it relates to ignition delay time, and this ignition delay time is that fuel starts to be ejected into pressure that in cylinder, the burning of (being injection beginning (SOI)) and fuel/air mixture the causes tolerance of the time between increasing.
Cetane number cn instruction cetane and the contained cetane percentage by volume of alpha-methyl-naphthalene mixture of fuel, under the same conditions, this mixture has the ignition delay time identical with fuel to be tested, and the cetane number of this fuel to be tested will be determined.The cetane number of fuel is higher, and ignition quality is higher or ignition delay time is shorter.
The cetane number cn of diesel fuel or particular type fuel can change, and during with convenient explosive motor work, can not suppose the fuel used consistent constant cetane number that has.Therefore, pollute and product tolerance all cause one with identical vehicle market in the fluctuation of cetane number.The system clause changing in world wide means that the diesel fuel of every country can have different cetane number.
Different cetane number causes different ignition lags, i.e. ignition delay time.In order to address this problem, be necessary to fuel used On-Board Diagnostics (OBD) to operation explosive motor at any given time, the therefore operating parameter of explosive motor, particularly injection beginning, can adapt with the cetane number of fuel.
Prior art attempts to detect by direct or indirect measurement the combustion process occurring in cylinder, to obtain the information about fuel used ignition quality at any given time.
For example, cylinder pressure can be by utilizing pressure transducer directly to measure and detect, and pressure distribution is used to determine that burning starts (SOC), and then it is used for definite ignition lag with injection beginning (SOI) together with, that is, and and ignition delay time.The definite ignition delay time of this mode characterizes fuel, and the same with cetane number, is the tolerance of the ignition quality of fuel.The shortcoming of the method is that inner cylinder pressure sensor need to be provided, and it forms the surveying of relative complex.
According to another process, the detonation sensor such as such as strainometer or acceleration transducer are connected to the cylinder block (cylinder block) of explosive motor, to carried out the combustion process of carrying out in indirect detection cylinder and determined that burning starts (SOC) by measurement.The subject matter of indirectly measuring is relatively significant inexactness, that is, it is poor that its mass ratio is directly measured.Must be pointed out, indirectly measurement is seriously subject to the impact of the external factor such as the combustion process of carrying out in other cylinders for example.
The further possibility that detects combustion process by indirect measurement is to measure the rotational speed of bent axle, and the acceleration of bent axle allows to draw the conclusion about the combustion process of carrying out in cylinder.Above-mentioned is exactly the shortcoming of prior art.
US 2008/0051978A1 discloses cetane number and the otherwise method of during explosive motor idling, determining fuel, according to the preamble of claim 1, determine cetane number by the variable of measuring, the variable of this measurement obtains by crank angle and inner cylinder pressure sensor.
US 2008/0262699A1 discloses at explosive motor and during idling, has not determined the wherein method of the cetane number of fuel, cetane number is determined by the variable of measuring, this variable obtains by crank angle and inner cylinder pressure sensor, and extraly, obtain by engine loading, the variable obtaining by engine loading is determined by for example rotational speed and torque sensor.
Directly MEASUREMENT OF STEAM in-cylinder pressure is very complicated, and above-mentioned indirect method exists the problem of high s/n ratio.
Summary of the invention
The object of this invention is to provide the reliable method of determining the cetane number of fuel during explosive motor idling, the complexity of the method is less.
Described object is by realizing according to the said method described in this specification or corresponding engine controller.
The present invention utilizes such fact, and, in modern ic motor, idle speed is by rapid adjustment.The impact that the fuel mass that idle speed sprays being subject to from an engine cycle (4 stroke) to next engine cycle changes.This adjustment provides the information about just injected fuel mass required for the present invention of carrying out at once.
In the present invention, if explosive motor idling under rated condition, particularly idling under specified oil plant and coolant temperature stop or fuel limitation is fed in a cylinder.If a cylinder no longer produces any moment of torsion, the fuel mass that other cylinders must spray by raising correspondingly produces more high pulling torque to maintain idle speed.
The present invention is based on such understanding, essential amount of extra fuel depends on the cetane number of fuel.And have compared with compared with the fuel of high cetane number, for lower cetane number, in the time that the fuel that is fed to cylinder stops or being limited, must spray more additional fuel to maintain idle speed.This is longer because have the ignition delay time of more low-cetane fuel.
If injection beginning keeps constant during carrying out the method according to this invention, the fuel quantity of extra injection is clear and definite and accurately associated with fuel mass, above this point, illustrate, and this relation for given motor or engine type be can be predetermined variable.Therefore, by by being supplied to the total amount of fuel of all cylinders during idling and being supplied to the difference between the total amount of fuel that lacks (one fewer) cylinder to compare with stored reference value during idling, can establish the cetane number of fuel.
Enforcement of the present invention is determined the extra sophisticated sensors in method without being used in known cetane number, as inner cylinder pressure sensor, detonation sensor or NOx sensor.
The further favourable development of the present invention is pointed out in the following detailed description.
Brief description of the drawings
Below with reference to accompanying drawing, explain in more detail by way of example the present invention, wherein:
Fig. 1 shows the demand for fuel of high or low cetane number in many cylinders explosive motor of describing based on 100 engine cycles, and it is constant that the idle speed of this explosive motor keeps, and wherein cylinder is closed in the 50th engine cycle; And
Fig. 2 is the flow chart of the exemplary embodiment for the method for determining cetane number is described.
Embodiment
In Fig. 1, x axle represents the continuous engine cycle of many cylinders explosive motor, and y axle represents the demand for fuel (unit is mg/ stroke) under constant idle speed.Demand for fuel is the function of engine loading.Under idling condition, engine loading mainly comprises the moment of torsion of engine accessory and the moment of torsion of the optional automatic transmission in neutral not.Fig. 1 shows the exemplary requirement of two kinds of diesel fuels in 100 continuous engine cycles, and a kind of fuel has high cetane number, and another kind of fuel has low cetane number.In the 50th engine cycle, the fuel supply of a cylinder stops.With which, engine loading increases, and in order to keep motor in its idle speed, the demand for fuel of other cylinders increases.Especially, the idle speed controller of motor allows other cylinders to generate more high pulling torque by correspondingly supplying more fuel.
In Fig. 1, all detect that for two kinds of fuel fuel increases, but the increase of the fuel of high cetane number is less than the increase of low-cetane fuel, for every kind of fuel and all engine cycles, injection beginning (SOI) is maintained at reference value.Obviously, can the increase based on demand for fuel determine the cetane number of fuel.
The concrete example of the cetane number of the current burning fuel of engine controller how to confirm of diesel engine is described in the situation that idle speed controller keeps idle speed constant referring now to Fig. 2.
In step S1, whether inquiry needs to determine cetane number, for example, because fuel tank just refuels.If do not needed, process stops.If needed, step S2 relates to wait, until next idling mode starts, and step S3 checks whether idling occurs under rated condition, and namely in the time that motor is awfully hot, this is hot is defined by specified oil plant temperature and specified coolant temperature.If not, process turns back to step S2 and waits for next idling mode, and if so, in step S4, determine reference fuel demand mf_dmd_tot_ref based on multiple engine cycles, the mean value mf_dmd_tot supplying using the fuel of setting up as idle speed controller.Injection beginning SOI_ref used herein is kept constant subsequently.
In step S5, select cylinder CylFuCut, and fuel supply is cut off or reduces.In step S6, by idle speed controller, self-adjusting current demanded fuel mf_dmd_tot_cur is determined to be in the mean value of SOI_ref based on multiple engine cycles.In step S7, the difference DELTA mf_dmd_tot_ (SOI_ref) between current demand for fuel mf_dmd_tot_cur and reference fuel demand mf_dmd_tot_ref is calculated.
Be the function of difference DELTA mf_dmd_tot_ (SOI_ref) definite in step S7 with reference to the difference DELTA CN between the cetane number cn cur of cetane number cn ref and current burning fuel, and this function had been previously to set up the test from carrying out according to Fig. 1.Therefore, the cetane number cn cur of current burning fuel can be calculated and is kept in nonvolatile memory, so that subsequently by the parameter that operates explosive motor for engine controller.
Whether step S9 inquiry needs to re-execute cetane number and determine by closing another cylinder, for example, in order to increase degree of accuracy.If so, process turns back to step S5, and wherein another cylinder CylFuCut is selected, and its fuel supply is cut off, and if not, process stops.
Claims (6)
1. during thering is fuel and spray the idling of explosive motor of multiple cylinders wherein, determine a method for the cetane number of fuel,
Wherein
When with reference to injection beginning, determine average total fuel supply of all cylinders during idling,
Stop or limiting the fuel supply of a cylinder in these cylinders,
Stop or the confined while in the fuel supply of a cylinder, described during with reference to injection beginning, determine average total fuel supply of every other cylinder during idling,
Fuel total supply and the difference between fuel total supply while stopping without cylinder when defining cylinder and stopping, and
By the difference between two described fuel total supplys is compared with preserved reference value, establish the cetane number of current burning fuel.
2. method according to claim 1,
Wherein in carrying out described method, keep the idle speed of described explosive motor constant.
3. method according to claim 1 and 2,
Wherein, by adjusting described fuel total supply, idle speed controller keeps described idle speed constant.
4. method according to claim 1 and 2,
Wherein said explosive motor is that diesel engine and described fuel are diesel fuels.
5. method according to claim 1 and 2,
Wherein carry out continuously step below:
When with reference to injection beginning, determine the mean value of reference fuel demand using the fuel supply as being adjusted by idle speed controller on N engine cycle, wherein N>1,
The cylinder of selecting fuel supply to be cut off or to reduce,
During with reference to injection beginning, determine the mean value of current demand for fuel using the fuel supply as being adjusted by described idle speed controller described on N engine cycle,
During with reference to injection beginning, calculate the difference between described current demand for fuel and described reference fuel demand described, and
From the described difference calculated before and before known function calculate the cetane number of current burning fuel, this function representation is with reference to the difference between cetane number and the cetane number of current burning fuel.
6. an engine controller, it is configured to determine the cetane number of fuel during having fuel and spray the idling of explosive motor of multiple cylinders wherein,
Wherein said engine controller is for carrying out the method that aforementioned arbitrary claim is set up.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009002597A DE102009002597B3 (en) | 2009-04-23 | 2009-04-23 | Method for determining cetane number of fuel in no-load operation of multi-cylinder internal combustion engine, involves determining cetane number of currently burned fuel by comparing previously calculated difference with reference values |
| DE102009002597.9 | 2009-04-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101871397A CN101871397A (en) | 2010-10-27 |
| CN101871397B true CN101871397B (en) | 2014-09-17 |
Family
ID=42751245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010135614.2A Expired - Fee Related CN101871397B (en) | 2009-04-23 | 2010-03-15 | Method for determining cetane number of fuel in no-load operation of internal combustion engine |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101871397B (en) |
| DE (1) | DE102009002597B3 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5880219B2 (en) * | 2012-03-30 | 2016-03-08 | トヨタ自動車株式会社 | Engine fuel property estimation device |
| JP2018031340A (en) * | 2016-08-26 | 2018-03-01 | マツダ株式会社 | Fuel property determination device and combustion control device for engine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1906390A (en) * | 2004-06-01 | 2007-01-31 | 丰田自动车株式会社 | Method of determining cetane number of fuel in internal combustion engine |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4667275B2 (en) * | 2006-03-06 | 2011-04-06 | 本田技研工業株式会社 | Control device for internal combustion engine |
| JP4667346B2 (en) * | 2006-08-25 | 2011-04-13 | 本田技研工業株式会社 | Control device for internal combustion engine |
| JP4667347B2 (en) * | 2006-09-11 | 2011-04-13 | 本田技研工業株式会社 | Control device for internal combustion engine |
| JP4615503B2 (en) * | 2006-11-29 | 2011-01-19 | 本田技研工業株式会社 | Control device for internal combustion engine |
| DE102007056552A1 (en) * | 2007-11-23 | 2009-05-28 | Robert Bosch Gmbh | Fuel i.e. diesel, quality determining method for e.g. direct injection internal combustion engine of vehicle, involves determining course of injection amount required for idling, over engine temperature, and concluding quality from course |
| DE102008010107A1 (en) * | 2007-12-05 | 2009-06-10 | Robert Bosch Gmbh | Fuel i.e. diesel, classifying method for internal-combustion engine, involves determining frequency component, and assigning fuel in one fuel class based on characteristic that is phase assigned to component |
-
2009
- 2009-04-23 DE DE102009002597A patent/DE102009002597B3/en not_active Expired - Fee Related
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2010
- 2010-03-15 CN CN201010135614.2A patent/CN101871397B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1906390A (en) * | 2004-06-01 | 2007-01-31 | 丰田自动车株式会社 | Method of determining cetane number of fuel in internal combustion engine |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2007-239506A 2007.09.20 |
| JP特开2008-133785A 2008.06.12 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101871397A (en) | 2010-10-27 |
| DE102009002597B3 (en) | 2010-10-21 |
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