CN104204476B - Method and apparatus for determining the cetane number of a fuel - Google Patents

Method and apparatus for determining the cetane number of a fuel Download PDF

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Publication number
CN104204476B
CN104204476B CN201380018298.2A CN201380018298A CN104204476B CN 104204476 B CN104204476 B CN 104204476B CN 201380018298 A CN201380018298 A CN 201380018298A CN 104204476 B CN104204476 B CN 104204476B
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China
Prior art keywords
fuel
cetane number
presumption
value
flammability
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CN201380018298.2A
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Chinese (zh)
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CN104204476A (en
Inventor
土山牧男
金子广孝
谷口守
高须祐志
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Toyota Motor Corp
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Toyota Motor Corp
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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
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
    • 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
    • F02D2200/021—Engine temperature
    • 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
    • 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
    • F02D2200/0618—Actual fuel injection timing or delay, e.g. determined from fuel pressure drop
    • 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
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1012—Engine speed gradient
    • 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
    • F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
    • F02D2200/1015—Engines misfires
    • 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
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • 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
    • F02D41/0047—Controlling exhaust gas recirculation [EGR]
    • F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/047—Taking into account fuel evaporation or wall wetting
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
    • 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
    • F02D41/401—Controlling injection timing
    • 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
    • F02D41/402—Multiple injections
    • F02D41/403—Multiple injections with pilot injections
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

An engine control apparatus performs a plurality of estimations of ignition quality of fuel by using a plurality of different estimation logics corresponding one-to-one to the estimations, and performs an engine control based on a result of an estimation that indicates lowest ignition quality among the results of the estimations.

Description

Method and apparatus for determining the Cetane number of fuel
Background of invention
Technical field
The present invention relates to estimate the flammability of fuel and the electromotor of electromotor control is performed based on the result of presumption Control device and engine control.
Background technology
The fuel that diesel engine is sprayed by compression ignition is come the sprayed fuel that burns.Commercially available, use for diesel engine The light oil for making fuel has different compositions, and their flammability is also different.The flammability of fuel is interfered significantly on There is situation, electromotor output of cutoff etc..Therefore, in order to improve output performance, fuel economy performance and the discharge of diesel engine Performance, it is necessary to check currently used fuel flammability and according to the inspection result of the flammability of fuel come adjust with regard to The executive mode of the electromotor control of fuel injection timing and fuel injection amount etc..
The flammability of the light oil of the fuel of diesel engine is evaluated for use as by the Cetane number of light oil.The ten of sample light oil Six alkane values by the hexadecane in the mixture of hexadecane and alpha-methyl-naphthalene amount percent by volume expression, the hexadecane and The mixture of alpha-methyl-naphthalene presents and sample light oil identical flammability.
Have been proposed for the various logic for estimating the Cetane number of fuel.For example, Japanese Patent Application No.2011-256840 (JP 2011-256840A) discloses a kind of logic, in the logic, based on after fuel injection The rotation change of diesel engine, the relation between fuel injection timing and engine speed during fuel injection are estimating diesel engine The Cetane number of fuel.
It is conceivable that estimating the flammability of fuel by using different presumption logics.In this case, by In the difference of presumption principle, different presumption logics provides the presumption result for differing sometimes.Therefore, this may result in and starts Machine control vibration (hunting).
For example it is assumed that giving the relatively low presumption of Cetane number of currently used fuel based on the presumption of presumption logic A As a result, the presumption for being based on presumption logic B gives the higher presumption result of Cetane number of currently used fuel.This In the case of, after the presumption based on presumption logic A is implemented, enforcement is based on to envision and has used the relatively low fuel of Cetane number and set The electromotor control of meter；On the other hand, after the presumption based on presumption logic B is implemented, enforcement has used 16 based on imagination The higher fuel of alkane value and design electromotor control.Therefore, the presumption based on one of presumption logic is implemented every time, will be changed The execution pattern of electromotor control, and therefore, control becomes unstable.
The content of the invention
The present invention provides device for controlling engine and engine control, the device for controlling engine and electromotor control Method processed can suppress control vibration, and therefore, it is possible to be appropriately performed electromotor control, even if using multiple different Estimate logic to be also such in the case of the flammability for estimating fuel.
Device for controlling engine according to the first aspect of the invention is performed by using multiple different presumption logics The presumption of the minimum flammability of instruction in the multiple presumption to the flammability of fuel, and the result based on the multiple presumption As a result performing electromotor control, wherein, repeatedly presumption is corresponded described in the plurality of different presumption logical AND.
In above-mentioned construction, when repeatedly presumption gives different presumption results, indicate in multiple presumption results most The presumption result of low flammability is used as the basis for performing electromotor control.Therefore, even if the different presumption result of output, also can It is enough to suppress control vibration.Further, since indicate that the presumption result of the minimum flammability in multiple presumption results is used to perform sending out Motivation is controlled, and can suitably ensure against the robustness of cutoff.Therefore, according to above-mentioned construction, even if using multiple presumption sides Method estimates the flammability of currently used fuel, it is also possible to suppresses control vibration, and can be appropriately performed electromotor control System.
In the first aspect, device for controlling engine can estimate the ignitability of fuel based on the situation that cutoff occurs The flammability of fuel, can be estimated based on the amount of refuelling and based on the motor torque produced by the burning of fuel Size estimating the flammability of fuel.
If the flammability of fuel is relatively low, cutoff may occur.Therefore, it can work as from the situation presumption that cutoff occurs The flammability of the front fuel for using.Additionally, after refuelling, the composition of the fuel in fuel tank would generally change, therefore, The flammability of fuel changes.The maximum variable quantity of the flammability of fuel can be obtained from the amount of refuelling.Furthermore, if combustion The flammability of material is reduced, then the fuel combustion of per unit mass and the motor torque that produces changes.Accordingly it is also possible to from logical The size for crossing the motor torque of the burning generation of fuel estimates the flammability of currently used fuel.Therefore, in above-mentioned structure In making, pushed away based on the size of the situation, the amount of refuelling that cutoff occurs and the motor torque of the burning generation for passing through fuel The flammability of fixed currently used fuel.
If repeatedly presumption gives different results, based on indicating minimum ignitability in these different presumption results Can presumption result performing electromotor control.Therefore, even if giving different presumption results, it is also possible to suppress control to shake Swing.Further, since performing electromotor control by using the presumption result for indicating minimum flammability, it is possible to suitably Ensure against the robustness of cutoff.Therefore, according to above-mentioned construction, even if estimating currently used fuel using multiple presumption methods Flammability, it is also possible to suppress control vibration, and electromotor control can be appropriately performed.
Engine control according to the second aspect of the invention includes：Come by using multiple different presumption logics The multiple presumption of the flammability to fuel is performed, multiple presumption described in the plurality of different presumption logical AND is corresponded； Electromotor control is performed with the presumption result of the minimum flammability of instruction in the result based on the multiple presumption.
Description of the drawings
Feature, advantage and technology and the industry that the following drawings illustrate the exemplary embodiment of the present invention is important Property, in the accompanying drawings, identical reference instruction identical element, and wherein：
Fig. 1 is the totality for schematically showing the total structure of device for controlling engine according to an embodiment of the invention View；
Fig. 2 shows cuing open for the structure of the lateral parts of the ejector being arranged in the diesel engine using the embodiment View；
Fig. 3 shows the chart of an example of the time waveform of fuel injection rate；
Fig. 4 shows the process of the calculation procedure of the Cetane number determined based on torque for adopting in the above-described embodiments The flow chart of process；
Fig. 5 A show the electromotor before and after the fuel injection of the Cetane number for being used for detecting fuel is performed The chart of the change of rotating speed, and Fig. 5 B were showed before and after performing for detecting the fuel injection of Cetane number The chart of the change of speed discrepancy；
Fig. 6 shows the flow process of the control that the adopts in the described embodiment processing procedure of Cetane number setting program Figure；With
Fig. 7 is time diagram, it illustrates detect based on cutoff ten in the device for controlling engine of the embodiment The change of six alkane values, the Cetane number, the Cetane number based on torque determination and control Cetane number determined based on refuelling One example of mode.
Specific embodiment
Hereinafter, the enforcement for wherein implementing device for controlling engine of the invention will be explained referring to figs. 1 to Fig. 7 Example.Incidentally, the Application of control device of the embodiment is to the diesel engine being mounted in vehicle.
As shown in figure 1, being provided with fuel quantity ga(u)ge 11, the combustion using the fuel tank 10 of the diesel engine of the control device of the embodiment Remaining fuel quantity in the material measurement fuel tank 10 of table 11.Additionally, fuel tank 10 is connected with fuel supply passageway 12, the fuel is supplied It is used for fuel of the transmission to be supplied to diesel engine to path 12.The mid portion of fuel supply passageway 12 is provided with high pressure fuel pump 13, the high pressure fuel pump 13 pumps fuel from fuel tank 10, and then fuel pressurizes and the fuel that pressurizeed is discharged.Fuel is supplied The common rail 14 for keeping pressurized fuel is connected to the downstream end of path 12.Common rail 14 is connected with the spray of the cylinder for diesel engine Emitter 16.Each ejector 16 is designed with fuel pressure sensor 17, in the detection ejector 16 of the fuel pressure sensor 17 Fuel pressure.Additionally, ejector 16 is connected to return path 18, the return path 18 is used to return superfluous fuel quantity To fuel tank 10.
The diesel engine being constructed so as to is controlled by electronic control unit 19.Electronic control unit 19 includes microcomputer, The microcomputer performs the various calculating relevant with electromotor control and processes.Additionally, electronic control unit 19 is provided with input Circuit, the input circuit receives the signal input of the various sensors of the operating conditions for carrying out Autonomous test diesel engine.Fuel quantity ga(u)ge 11 Input circuit is connected to fuel pressure sensor 17.Being connected to other sensors of input circuit includes detection admission pressure Air inlet pressure sensor 20, detection diesel engine rotating speed speed probe 21, detection diesel engine coolant temperature it is cold But agent temperature sensor 22, detection accelerator pedal tread-on quantity accelerator pedal sensors 23 and detection car speed car Velocity sensor 24 etc..Additionally, electronic control unit 19 is provided with the drive circuit for actuator, the actuator drives bavin The various parts of oil machine.Drive circuit includes the circuit of the ejector 16 for drive cylinder.
Explanation is provided for other details of the construction of each ejector 16 of each cylinder of diesel engine.The diesel engine Using electric drive ejector as ejector 16.
As shown in Figure 2, each ejector 16 has housing 30, and the housing 30 has hollow circle tube shape. Needle-valve 31 is disposed with housing 30, the needle-valve 31 is used to along the above-below direction in Fig. 2 move back and forth.Additionally, housing 30 In fig. 2 relative to being disposed with spring 32 in the superposed part of needle-valve 31, the spring 32 always along in Fig. 2 to Lower direction pushes needle-valve 31.
Additionally, being formed with two fuel chambers in housing 30, described two combustor are separated from one another by needle-valve 31, more Body ground, described two fuel chambers be in fig. 2 relative to needle-valve 31 be located at opposing lower portions nozzle box 33 and in fig. 2 relative to Needle-valve 31 is located at the pressure chamber 34 of opposite upper parts.
Nozzle box 33 is provided with spray-hole 35, the inside of the connection of the spray-hole 35 nozzle box 33 and the outside of housing 30.Spray Mouth room 33 is connected with introducing path 36, and the introducing path 36 is formed in housing 30.Introducing path 36 is connected to the (figure of common rail 14 1).Fuel is supplied in nozzle box 33 from common rail 14 via introducing path 36.
On the other hand, pressure chamber 34 is connected to nozzle box 33 by communication paths 37, and is connected by drain passageway 38 To above-mentioned return path 18.Additionally, being provided with valve body 40 in pressure chamber 34, the valve body 40 is by piezoelectricity (pressure- Electric) actuator 39 drives, and the piezo-activator 39 is formed by laminated piezoelectric device, and the piezoelectric element is for example It is piezoelectric type (piezoelectric) element.Thus, by drive valve body 40 make pressure chamber 34 optionally with communication paths 37 Connect with drain passageway 38.
Fuel pressure sensor 17 as above is arranged to integral with the upper part of the ejector 16 in Fig. 2.Combustion Material pressure transducer 17 is configured for detecting the fuel pressure in introducing path 36.
Each operating as follows in the ejector 16 being constructed so as to.Piezo-activator 39 is being not switched on driving Galvanic electricity presents contraction state when pressing, and in the contraction state, the entire length of piezo-activator 39 reduces, valve body 40 is determined The position that position causes pressure chamber 34 to connect with communication paths 37 and disconnects with drain passageway 38.Now, nozzle box 33 and pressure Room 34 communicates with each other, to make two rooms in pressure it is of substantially equal.Therefore, now, the elastic force of spring 32 arrives needle-valve 31 Up to the bottom in Fig. 2, to close spray-hole 35.Therefore, now, not from the spray fuel of ejector 16.
On the other hand, when piezo-activator 39 connects driving voltage, the entire length increase of piezo-activator 39, so as to Valve body 40 is positioned so that the position that disconnects with communication paths 37 and connect with drain passageway 38 of pressure chamber 34.Now, from pressure Discharge the pressure drop in fuel, and pressure chamber 34 in power room 34.Therefore, the pressure in nozzle box 33 goes above pressure chamber 34 In pressure.Now, due to pressure differential, the elastic force of spring 32 makes needle-valve 31 move up in fig. 2, i.e. move away from pin Valve 31 closes the position of spray-hole 35.Therefore, now, the spray fuel of ejector 16.
In embodiment configured as above, electronic control unit 19 performs the fuel injection control of diesel engine.Specifically Ground, electronic control unit 19 is pushed away from the Cetane number of engine speed, the tread-on quantity of accelerator pedal and the fuel for being used Definite value (control Cetane number) is calculating the desired value (target fuel injection amount) of fuel injection amount.Additionally, electronic control unit 19 desired values that fuel injection timing is calculated from target fuel injection amount and engine speed and duration of charge Desired value.Then, according to the desired value that these are calculated, driving voltage is applied to each ejector 16 by electronic control unit 19 Piezo-activator 39, so as to control fuel injection.
Additionally, in this embodiment, in combination with above-mentioned fuel injection control, electronic control unit 19 is based on to be used by setting The fuel pressure detected by fuel pressure sensor 17 in each ejector 16 is implementing to be formed the combustion of each ejector 16 The control of the time waveform of material spraying rate (fuel quantity of time per unit injection).This control is carried out as follows.
Start from spray-hole 35 to carry according to the driving voltage for being applied to piezo-activator 39 in the needle-valve 31 of ejector 16 After rising, the fuel pressure in nozzle box 33 is gradually reduced with the increase of the lifting capacity of needle-valve 31.Then, stop applying to drive Voltage, and the lifting capacity reduction of needle-valve 31.With the reduction of the lifting capacity of valve, the fuel pressure in nozzle box 33 gradually rises It is high.Therefore, using the fuel pressure detected by the fuel pressure sensor 17 of ejector 16, needle-valve 31 can clearly be determined Start the timing (valve is opened to drive and starts timing Tos) of lifting, fuel injection rate to become maximum timing and (reach maximum injection rate Timing Toe), fuel injection rate starts the timing (fuel injection rate reduce start timing Tcs) that reduces and the end of needle-valve 31 is carried The timing (reaching the timing Tce of minimum lift) for rising.Then, from timing determined by these, it is possible to obtain as shown in Figure 3 The time waveform of fuel injection rate.From the waveform, the actual state that fuel injection can be checked with very high accuracy.In passing Refer to, in this embodiment, electronic control unit 19 obtains the rate of change (fuel pressure of the fuel pressure in each ejector 16 The time-derivative of power), and above-mentioned timing is obtained based on the rate of change.
Additionally, in this embodiment, electronic control unit 19 estimates the Cetane number of currently used fuel, i.e. push away Determine the flammability of fuel.Then, according to presumption result, electronic control unit 19 adjusts control fuel injection timing, control combustion The mode of material emitted dose, control EGR amount, control supercharging rate etc..Which improve the output performance of diesel engine, fuel economy performance and Discharge performance.For example, when the Cetane number for deducing currently used fuel is relatively low, electronic control unit 19 changes control Mode, for example increase pilot injection perform number of times or increase pilot injection amount, make pilot injection timing and main injection determine Shi Tiqian, the amount for reducing EGR, raising supercharging rate etc., to suppress the cutoff by caused by the relatively low flammability of fuel.
In the device for controlling engine of the embodiment, the hexadecane of fuel is estimated by using three presumption logics Value.These three presumption logics be based on cutoff cetane number of fuel presumption, based on refuelling cetane number of fuel presumption and Cetane number of fuel based on motor torque is estimated.These three presumption logics are described more detail below.
【Cetane number based on cutoff is estimated】If using the fuel of Cetane number relatively low (its flammability is poor), The incidence rate increase of cutoff.Therefore, it is possible to estimate the Cetane number of currently used fuel from the situation that cutoff occurs.
Specifically, electronic control unit 19 detects cutoff from the change of engine speed.Then, when detecting cutoff When number of times reaches predetermined value, electronic control unit 19 reduces the presumed value of the Cetane number of fuel based on the situation that cutoff occurs, Namely be based on the value of the Cetane number of cutoff detection.Incidentally, in refuelling, the Cetane number detected based on cutoff Value is reset as initial value.Every time during refuelling, the number of times for detecting cutoff is all scavenged into " 0 ".
【Cetane number based on refuelling is estimated】When to 10 refuelling of fuel tank, the propellant composition in fuel tank 10 changes Become, and the Cetane number of fuel changes.The Cetane number of fuel that can also be from before refuelling, amount of refuelling etc. are obtained The maximum of the amplitude of variation of Cetane number.
Specifically, when refuelling is recognized in remaining fuel quantity increase in due to fuel tank 10, based on added Fuel be the minimum fuel it is assumed that the presumption of electronic control unit 19 plus combustion of Cetane number in all fuel for using of expection The Cetane number of the fuel after material.The Cetane number for now estimating is calculated based on following formula (1), i.e. based on refuelling It is determined that Cetane number Cr.In following formula (1), Fb represent before refuelling remaining fuel quantity in fuel tank 10 (plus Remaining fuel amounts before fuel), Fr represents fuel quantity (fuel quantity or refuelling that fuel tank increases being added in fuel tank 10 Amount), and Fa represents after refuelling remaining fuel quantity (remaining fuel amounts after refuelling) in fuel tank 10.This Outward, Cb represents the Cetane number presumed value (Cetane number before refuelling) of the fuel in the fuel tank 10 before refuelling, And Cm represents the minima (minimum Cetane number) in the Cetane number of the fuel that expection is used.
Cr=(Cb × Fb+Cm × Fr)/Fa ... (1)
Incidentally, the Cetane number determined based on refuelling is calculated when refuelling is recognized.Then, based on fuel The size of produced motor torque obtains the time point of the presumption result of Cetane number after injection, will be true based on refuelling The value of fixed Cetane number resets to initial value.
【Cetane number based on motor torque is estimated】The flammability of fuel is higher, remaining unburned after burning Fuel quantity it is fewer, and motor torque produced after fuel injection is bigger.Therefore, illustrate below satisfaction During execution condition, electronic control unit 19 sprays a small amount of fuel, obtains sending out produced by a small amount of fuel combustion for passing through to be sprayed The size of motivation torque (produced torque), then estimates the Cetane number of fuel from the size of produced torque.
Specifically, by the process of Cetane number is determined based on torque shown in Fig. 4 calculation procedure come based on fuel The size presumption Cetane number (based on the Cetane number that torque determines) of the torque produced after injection.In the diesel operation phase Between, in each predetermined control circulation time, electronic control unit 19 is repeatedly carried out the process of the program.
When the process of the program starts, determine whether in the step s 100 to meet to perform first to determine 16 based on torque The condition of the calculating of alkane value.The execution condition is to meet following condition (A) to condition (C).(A) it is carrying out being grasped according to accelerator The fuel cut-off during deceleration of the diesel engine of discontinuing the operation for making (that is, accelerator pedal trample).(B) upper once to fuel tank 10 Total fuel injection quantity after refuelling is more than or equal to predetermined value α.Incidentally, predetermined value α is set to be greater than can fill The value of the total fuel quantity filled out in the fuel channel for extending to ejector 16 from fuel tank 10.That is, meet condition (B) it is meant that After upper once refuelling, the fresh fuel that the fuel in above-mentioned fuel channel has been supplied from fuel tank 10 replaces.(C) Jing is no consecutive identical with the value for calculating before predetermined time by the Cetane number based on torque determination that program is calculated Several or more number of times.If connected based on the torque Cetane number for determining and the value being previously calculated out by what program was calculated Continuous identical pre-determined number or more number of times, the then it is considered that value of the Cetane number determined based on torque for calculating is from next Secondary calculating starts to keep constant.Therefore, in this case, this embodiment stops calculating the hexadecane determined based on torque Value.Incidentally, the time point when refuelling is detected, the Cetane number determined based on torque that removing is calculated keeps phase The counting of same number of times.
If being unsatisfactory for execution condition (no), the currently processed of program is immediately finished.If meeting execution condition (YES), Then process proceeds to step S101.Then, in step S101, based on engine speed, engine coolant temperature and air inlet Pressure sets the timing for detecting the fuel injection of the Cetane number of fuel.Incidentally, using engine speed, electromotor The reason for coolant temperature and admission pressure are to calculate fuel injection timing is as follows.
Remaining unburned fuel amount changes according to fuel injection timing and fuel fire performance after burning.Such as Fruit fuel injection timing is more early, then from fuel injection when start to in-cylinder pressure and/or cylinder temperature to reduce and cause no longer Time when enough being burnt is longer.Therefore, fuel injection timing is more early, then firing duration is longer, and after burning Remaining unburned fuel amount is fewer.On the other hand, fuel injection timing is about late, from fuel injection when start to no longer Above-mentioned time when enough being burnt is shorter, and burn persistent period it is shorter, and therefore in the cylinder it is remaining not The fuel quantity of burning is more.Engine speed is higher, from fuel injection when start to in-cylinder pressure and/or cylinder temperature to start Time during reduction is shorter.Therefore, in order that burning condition homogenization, engine speed is higher, for detecting the ten of fuel The timing of the fuel injection of six alkane values needs in advance more.
Additionally, when wall temperature is relatively low, maximum (the peak cylinder interior temperature of the cylinder temperature in engine compression strokes Degree) it is relatively low.When admission pressure is relatively low, the maximum (peak in-cylinder pressure) of the in-cylinder pressure in engine compression strokes compared with It is low.Peak value cylinder temperature or peak in-cylinder pressure are lower, and the persistent period of the high-temperature high-pressure state in cylinder is shorter, and fires The persistent period of burning is also shorter.Therefore, in order that burning condition homogenization, wall temperature or admission pressure are lower, are used for Detection Cetane number fuel injection timing need in advance it is more.
Therefore, in this embodiment, in order that the burning bar of the fuel sprayed for detecting the Cetane number of fuel Part homogenization, the spray of fuel is adjusted according to engine speed at that time, wall temperature at that time and admission pressure at that time Penetrate timing.Specifically, in this embodiment, engine speed is higher, for detecting the fuel injection of the Cetane number of fuel Timing by advance it is more.Equally, in this embodiment, (it is the index of wall temperature to engine coolant temperature Value) it is lower, for detect the Cetane number of fuel fuel injection timing by advance it is more.Additionally, in this embodiment In, admission pressure reduce, for detect Cetane number fuel injection timing by advance it is more.
After fuel injection timing is set in the above described manner, in subsequent step S102, spray in set timing Penetrate the fuel of scheduled volume.Then, in step s 103, the size of the torque produced by the fuel injection is obtained.
Calculate produced torque as follows in step s 103.Electronic control unit 19 is in each predetermined circulation Time obtains engine speed, and obtains in acquired engine speed and the electromotor acquired in previous circulation time Difference (obtaining rotation speed difference deltan NE) between rotating speed.
Fig. 5 A show the engine speed before and after the fuel injection for performing the Cetane number for being used for detecting fuel Change, and Fig. 5 B show the change of rotation speed difference deltan NE at that time.Due to performing the Cetane number for being used for detecting fuel Fuel injection generates motor torque, so the reduction rate of engine speed increase or engine speed reduces so that rotating speed The NE increases of difference Δ.The torque of generation is bigger, the time-derivative value of the increase of rotation speed difference deltan NE (its with Fig. 5 B in dashed area Area it is corresponding) it is bigger.Therefore, in this embodiment, the time-derivative value of the increase of rotation speed difference deltan NE is calculated as Rotationally-varying amount Σ Δ NE, and the value of the rotationally-varying amount Σ Δ NE is used as the desired value of produced torque.
Subsequently, in step S104, the time waveform of the fuel injection rate of the fuel injection performed from step S102 is obtained Natural fuel injection timing and actual fuel injection quantities, and calculate the bid value of fuel injection timing and fuel injection amount with The error (injection timing error and emitted dose error) of the actual value of fuel injection timing and fuel injection amount.Then, based on spray Timing error and emitted dose error are penetrated, rotationally-varying amount Σ Δ NE is corrected.This amendment be amendment with by injection timing error and The corresponding amount of the variable quantity of the motor torque that emitted dose error causes, and for mitigating injection timing error and emitted dose Error estimates the impact of result to the Cetane number of fuel.Specifically, towards side in advance, (injection timing becomes into one injection timing Step side in advance) error it is bigger, produced torque is bigger, thus reduce to a greater degree rotationally-varying amount Σ Δ NE with For correcting.Additionally, emitted dose is bigger towards the error of increase side, produced torque is bigger, therefore subtracts to a greater degree Little rotationally-varying amount Σ Δ NE is for amendment.
Subsequently, in step S105, based on starting when revised rotationally-varying amount Σ Δ NE and execution fuel injection Machine rotating speed is calculating the Cetane number for deducing of fuel.The microcomputer pre-stored of electronic control unit 19 is rule of thumb pre- The Cetane number of the fuel for first determining and rotationally-varying amount Σ Δ NE and the relation of engine speed.Closed based on these of pre-stored It is the calculating in execution step S105.After the Cetane number determined based on torque is calculated, the currently processed end of program.
【The setting of control Cetane number】As described above, currently being made to estimate by using three different presumption logics The Cetane number of fuel.These presumption logics are different from each other in terms of presumption principle, and therefore produce sometimes different Cetane number estimates result.In this embodiment, in order to prevent even, in this case appearance control is vibrated (hunting), as follows setting is applied to the Cetane number presumed value of the fuel of electromotor control, i.e. control Use Cetane number.
By the control shown in Fig. 6 with Cetane number setting program process to set this embodiment in control use Cetane number.During diesel operation, by electronic control unit 19 under each predetermined control circulation time repeatedly Perform the process of this program.
When the process of program starts, judge three Cetane number presumed values (i.e. based on cutoff in step s 200 first The Cetane number of detection, based on refuelling determine Cetane number and torque determine Cetane number) in any one whether It is updated over.If no one of these three presumed values are updated over (no), the currently processed of program is immediately finished.This In the case of, control Cetane number is remained into currency.
On the other hand, if any one in these three Cetane number presumed values is updated over (being in s 200 yes), By control Cetane number be set as based on cutoff detection Cetane number, based on refuelling determine Cetane number and based on turn Minimum one in the Cetane number that square determines, i.e. the Cetane number presumption for indicating to be provided by three presumption logics is provided The presumption result of the minimum cetane number in as a result.Hereafter, the currently processed end of program.
Now, the operation of above-described embodiment will be illustrated with reference to Fig. 7.Fig. 7 shows that the electromotor control of this embodiment sets The Cetane number detected based on cutoff in standby, the Cetane number determined based on refuelling, the Cetane number determined based on torque And the example of the variation pattern of control Cetane number.
Till time t1, the Cetane number determined based on torque is all in Cetane number, the base based on cutoff detection Minima in the Cetane number determined in the Cetane number that refuelling determines and based on torque.Therefore, before time t 1 During time period, the value of the Cetane number determined based on torque is set to the value of control Cetane number.
When the refuelling in time t1, the value of the Cetane number determined based on refuelling is updated so that based on refuelling It is determined that the value of Cetane number become less than the value of Cetane number that determines based on torque (it be fuel before the time point Minima in Cetane number presumed value).Therefore, from the beginning of time t1, the value of the Cetane number determined based on refuelling is set It is set to the value of control Cetane number.
Then, in time t2, above-mentioned execution condition is met, and based on by the electromotor turn produced by the burning of fuel Square come estimate fuel Cetane number (calculate based on torque determine Cetane number).During this presumption, based on torque It is determined that Cetane number be calculated as it is with the value for calculating before identical, and therefore, based on the Cetane number that torque determines Value is constant.According to the value of the Cetane number determined based on torque for now calculating, updated due to refuelling in time t1 The value of the Cetane number determined based on refuelling is reset as initial value.As a result, the value of the Cetane number for being determined based on refuelling Go above the value of the Cetane number determined based on torque so that the Cetane number determined based on torque is three hexadecanes Minima in value presumed value.Therefore, from the beginning of time t2, the value of the Cetane number determined based on torque is set to control and is used The value of Cetane number.
Then, when in the time, t3 detects cutoff, the value of the Cetane number detected based on cutoff is reduced.As a result, it is based on Less than the value for being based on the Cetane number that torque determines, (it was fuel before the time point to the value of the Cetane number of cutoff detection It is minimum in three Cetane number presumed values).Therefore, from the beginning of time t3, the Cetane number detected based on cutoff Value is set to the value of control Cetane number.
Hereafter, when the refuelling in time t4, the value of the Cetane number determined based on refuelling is updated.On the other hand, In response to refuelling, the value of the Cetane number detected based on cutoff is reset as initial value.As a result, ten for being determined based on refuelling The value of six alkane values becomes less than the value of the value of the Cetane number detected based on cutoff and the Cetane number based on torque determination so that From the beginning of time t4, the value of the current Cetane number determined based on refuelling for updating is set to control Cetane number Value.
Then, in time t5, meet above-mentioned execution condition, and perform the place for calculating the Cetane number determined based on torque Reason.In this calculating is processed, the Cetane number calculated based on torque determination is identical with the value being previously calculated out.According to now The value of the Cetane number determined based on torque for calculating, is determined due to updating in time t4 refuelling, based on refuelling The value of Cetane number be reset as initial value.Therefore, as a result, the value of the Cetane number determined based on refuelling goes above base The value of the Cetane number determined in torque so that the value of the Cetane number determined based on torque is three Cetane number presumption Minimum one in value.Therefore, from the beginning of time t5, the value of the Cetane number determined based on torque is set to control and uses ten The value of six alkane values.
Then, in time t6, execution condition is met again, and perform the Cetane number calculated based on torque determination again Process.As a result, the value increase of the Cetane number for being determined based on torque.Therefore, from the beginning of time t6, ten determined based on torque The value of the increase of six alkane values is set to the value of control Cetane number.
According to the device for controlling engine of above-described embodiment, it is possible to achieve following effect.In the described embodiment, for send out The control Cetane number of motivation control is set to three hexadecanes for indicating to be obtained using each different presumption logic Value (Cetane number determined based on the Cetane number of cutoff detection, the Cetane number determined based on refuelling and based on torque) The presumed value of the Cetane number of minimum one in presumed value.Therefore, though the presumed value of the Cetane number of fuel each other not Together, it is also possible to suppress control vibration.Further, since the hexadecane of minimum one in indicating the presumed value of multiple Cetane number The presumed value of value, it is possible to guaranteeing certain robustness, cutoff is caused to prevent because of the relatively low flammability of fuel.Cause This, is according to the embodiment, even if in the case where the flammability of currently used fuel is estimated using multiple presumption methods, Control vibration can be suppressed, and be appropriately performed electromotor control.
In the described embodiment, if based on torque determine Cetane number continuous pre-determined number be calculated as it is identical Value, then stop further performing the detection of the Cetane number determined based on torque.When slowing down (in this phase during fuel cut-off Between usual not spray fuel), the Cetane number determined based on torque is detected by spray fuel, therefore cause to be typically without will Fuel consumption and produce white cigarette.In the described embodiment, it is determined that the value of the Cetane number determined based on torque has been become Time point when substantially stationary, stops the Cetane number that detection is determined based on torque.Therefore, it can suitably limit for detecting Fuel consumption, and limit and produce the white cigarette related to the detection.
In the described embodiment, the value of the Cetane number based on cutoff detection is reduced according to the testing result of cutoff, and The value of control Cetane number is set equal to the value of the Cetane number detected based on cutoff or than ten based on cutoff detection The little value of the value of six alkane values.Then, before refuelling, the value based on the reduction of the Cetane number of cutoff detection is kept.Cause This, in the described embodiment, even if the hexadecane determined in the value of the Cetane number determined based on refuelling and/or based on torque In the case that the value of value is larger, in the event of if cutoff, control Cetane number is set to into less.Therefore, even if ought be Jing causes the combustion instability of cutoff when be not to be caused by the relatively low flammability of fuel, it is also possible to perform electromotor control System so that can suitably suppress cutoff.On the other hand, if performing refuelling, in response to refuelling, detected based on cutoff The value of Cetane number be reset, this is the factor that in anticipation of refuelling can release cutoff.Thereby, it is possible to perform Electromotor control match to the actual situation related with combustion stability, appropriate.
In this embodiment, the fuel injection rate for being obtained based on the testing result of the fuel pressure from ejector 16 Time waveform, control device obtains natural fuel injection timing and actual fuel injection quantities, and the torque (rotation produced by correcting Turn variable quantity Σ Δ NE).Due to less for the fuel injection amount that detects the Cetane number of fuel, even if so fuel injection is fixed When and/or fuel injection amount occur slight change, can also interfere significantly on the presumption result of Cetane number.However, in the reality In applying example, natural fuel injection timing and actual fuel injection quantities, and the calculating of the torque produced by correcting are obtained exactly As a result.Therefore, it can more accurately estimate 16 based on the size of the motor torque produced by the burning by fuel Alkane value.
In the described embodiment, the fuel injection for being adjusted for detecting the Cetane number of fuel according to engine speed is determined When.Specifically, engine speed is higher, for detect Cetane number fuel injection timing by advance it is more.Accordingly, it is capable to Presumption result of the change (it depends on engine speed) of the torque produced by enough suitably suppressing to the Cetane number of fuel Impact.
In the described embodiment, the fuel injection for being adjusted for detecting the Cetane number of fuel according to wall temperature is determined When.Specifically, engine coolant temperature (it is the desired value of wall temperature) is lower, for detecting the fuel of Cetane number The timing of injection by advance it is more.Therefore, it is possible to the change of the torque produced by suitably suppressing, (it depends on cylinder wall temperature Degree) impact to the presumption result of the Cetane number of fuel.
In the described embodiment, the fuel injection for being adjusted for detecting the Cetane number of fuel according to admission pressure is determined When.Specifically, admission pressure is lower, for detect Cetane number fuel injection timing by advance it is more.Therefore, it is possible to Shadow of the change (it depends on admission pressure) of the torque produced by suitably suppressing to the presumption result of the Cetane number of fuel Ring.
Incidentally, it is also possible to perform above example in the case where following modification is carried out.Although in above-described embodiment In, refuelling is detected based on the increase of remaining fuel quantity in the fuel tank 10 detected by fuel quantity ga(u)ge 11, but can also Otherwise (for example beat opening/closing by monitoring fuel tank cap) to detect refuelling.
Although in this embodiment, obtaining the motor torque produced by fuel combustion from the variable quantity of engine speed Size, but can also from other parameters obtain by fuel combustion produce motor torque size, it is described other ginseng Numerical example increase of in-cylinder pressure related to burning in this way etc..
Although the fuel injection in this embodiment, being adjusted for detecting the Cetane number of fuel according to admission pressure is determined When, but if admission pressure when can be assumed detection Cetane number is substantially invariable or if is led by the difference of admission pressure The change of the torque of the generation of cause is sufficiently small, then can omit this regulation to fuel injection timing.
Although in this embodiment, according to wall temperature adjusting the fuel injection for detecting the Cetane number of fuel Timing, but if can be assumed detection Cetane number when wall temperature be substantially invariable or if by cylinder wall temperature The change of the torque produced caused by the difference of degree is sufficiently small, then can omit this regulation to fuel injection timing.
Although in this embodiment, adjusting the fuel injection for detecting the Cetane number of fuel according to engine speed Regularly, but if can be assumed detection Cetane number when engine speed be substantially invariable or if by engine speed Difference caused by produce torque change it is sufficiently small, then can omit this regulation to fuel injection timing.
In the above-described embodiments, detect for the fuel in each ejector 16 during the fuel injection for detecting Cetane number The change of pressure, and obtain natural fuel injection timing and actual fuel injection quantities from the testing result.Then, will pass through The size of the motor torque that fuel combustion is produced is used to estimate before Cetane number, according to the actual combustion for obtaining in the above described manner Size (the rotationally-varying amount that material injection timing and actual fuel injection quantities amendment pass through the motor torque produced by fuel combustion ΣΔNE).However, in the case of can be with fully high accuracy controlling fuel injection amount or fuel injection timing, or Due to the change of torque produced caused by the change of fuel injection amount and/or fuel injection timing it is sufficiently small in the case of, Can be in the case where above-mentioned amendment need not be performed more accurately based on by the electromotor turn produced by the burning of fuel The size of square estimates the Cetane number of fuel.
In the above-described embodiments, when the hexadecane detected based on cutoff for temporarily reducing fuel in response to detecting cutoff During the value of value, the value of the reduction of the Cetane number detected based on cutoff is always maintained at before refuelling, so as to suitably true Protect the robustness for preventing cutoff.Be not pay the utmost attention to prevent cutoff robustness but pay the utmost attention to other engine performance When (such as fuel economy performance or output performance), the increase when stopping detecting cutoff can be allowed to be based on the ten of cutoff detection The value of six alkane values.
In the above-described embodiments, if continuous pre-determined number is calculated the Cetane number based on torque determination of fuel For identical value, the then Cetane number that further detection is not determined based on torque.However, work as can fully ignore for detecting When fuel consumption caused by the fuel injection of the Cetane number of fuel and related to the fuel injection for producing white cigarette, even if Continuous pre-determined number is calculated as identical value to the Cetane number determined based on torque, it is also possible to continue to detect based on torque It is determined that Cetane number.
Although the Cetane number that in this embodiment, detection is determined based on torque during fuel cut-off when slowing down, The Cetane number that can also be determined based on torque in detection during the time period in addition to fuel cut-off when slowing down.
Although the embodiment adopts such ejector 16, i.e. each in the ejector 16 includes fuel pressure Sensor 17 and operated by using piezo-activator 39, but also allowed for using using other actuating (or driving) sides The ejector of method or the ejector without fuel pressure sensor 17.
Next, will illustrate think from above example and its modification together with the effect of technical concept below To or the technical concept that understands.Can also have in the fuel for assuming to be supplied by refuelling and consider that what is used owns Amount in fuel in the case of minimum flammability based on refuelling estimates the flammability of fuel.
Can also be by spraying based on the engine speed in the fuel injection performed to estimate, by above-mentioned fuel The burning of penetrating sprayed fuel and the relation between the size of motor torque that produces and the timing of the fuel injection is calculated The presumed value of the desired value of flammability come be based on motor torque size estimate fuel flammability.
Can also be by the way that engine speed to be used as the finger of motor torque size by variable quantity caused by fuel combustion Scale value come be based on motor torque size estimate fuel flammability.

Claims (4)

1. a kind of device for controlling engine (19), it is characterised in that the device for controlling engine is performed based on there is cutoff Presumption of the situation to the flammability of fuel, the amount based on refuelling are to the presumption of the flammability of fuel and based on by fuel Presumption of the size of motor torque that produces of burning to the flammability of fuel, and in the result based on the multiple presumption The minimum flammability of instruction presumption result performing electromotor control.
2. device for controlling engine according to claim 1, wherein, when based on the electromotor produced by the burning of fuel When the continuous pre-determined number of presumption of the size of torque to the flammability of fuel is calculated as identical value, stop further performing base In presumption of the size by the motor torque for producing that burns of fuel to the flammability of fuel.
3. a kind of engine control, it is characterised in that the engine control includes：
The ignitability to fuel to the presumption, the amount based on refuelling of the flammability of fuel is performed based on the situation that cutoff occurs The presumption of the presumption of energy and the size based on the motor torque produced by the burning of fuel to the flammability of fuel；With
Electromotor control is performed based on the result of the presumption for indicating minimum flammability in the result of the multiple presumption.
4. engine control according to claim 3, wherein, when based on the electromotor produced by the burning of fuel When the continuous pre-determined number of presumption of the size of torque to the flammability of fuel is calculated as identical value, stop further performing base In presumption of the size by the motor torque for producing that burns of fuel to the flammability of fuel.
CN201380018298.2A 2012-03-30 2013-03-11 Method and apparatus for determining the cetane number of a fuel Expired - Fee Related CN104204476B (en)

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