• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Abstract The invention relates to an internal combustion engine that can be operated by means of a fuelmixture consisting of a base fuel and an alternative fuel. Concentration values (ETH_PERC) of thealternative fuel are determined in at least two different ways for operating said internal combustion engine. A reliable concentration value of the alternative fuel is determined depending on the variousdetermined concentration values (ETH_PERC).
    公开号:SE1050844A1
    申请号:SE1050844
    申请日:2008-12-10
    公开日:2010-10-14
    发明作者:Gerhard Haft；Frank Hacker
    申请人:Continental Automotive Gmbh；
    IPC主号:
    专利说明:

    PCT/EP2008/067210 / 2007P20088WOl Description Method and device for operating an internal combustion engine The invention relates to a method and device for operating aninternal combustion engine. The internal combustion engine isoperable with a fuel mixture comprising a basic fuel and an alternative fuel.
    A flexible fuel vehicle (FFV) is a vehicle that is operablewith a fuel mixture comprising a basic fuel and an alternativefuel. The basic fuel is for example petrol and thealternative fuel is for example ethanol. At appropriatefilling stations for example a petrol-ethanol mixture is sold,the ethanol component of which lies between 0% and 85%.Depending on the alternative fuel component, a different freshair mass is required for full combustion of a defined fuel mixture quantity.
    From US 5 182 942 A, a method of determining an ethanolcomponent in a fuel mixture is known. For this purpose asample of the fuel mixture is heated and its evaporationtemperature is acquired. In dependence upon the evaporation temperature the ethanol content of the fuel is inferred.
    The underlying object of the invention is to provide a methodand a device for operating an internal combustion engine thatcontribute towards a percentage value of an alternative fuelof a fuel mixture of the internal combustion engine being reliably determinable.
    PCT/EP2008/067210 / 2007P20088WO2 The object is achieved by the features of the independentclaims. Advantageous developments are indicated in the sub- claims.
    The invention is notable for a method and a device foroperating an internal combustion engine. The internalcombustion engine is operable with a fuel mixture comprising abasic fuel and an alternative fuel. Percentage values of thealternative fuel are determined in at least two differentways. In dependence upon the differently determinedpercentage values a reliable percentage value of the alternative fuel is determined.
    By determining the percentage values of the alternative fuelin at least two different ways, at least two percentage valuesare obtained. The different ways of determining thepercentage value, and in particular the determined percentagevalues make it possible to compensate errors in determiningthe percentage values and hence determine the reliablepercentage value in a particularly reliable manner. Reliablein the present context means that the determined reliablepercentage value corresponds particularly well to an actualpercentage value of the alternative fuel. The reliablepercentage value may be determined for example by means ofaveraging the determined percentage values. The basic fuel ispreferably petrol and the alternative fuel is for example ethanol.
    In an advantageous development, a lambda~based percentagevalue of the alternative fuel is determined in dependence upona determined lambda value of the internal combustion engine.This enables a particularly precise determination of one of the percentage values of the alternative fuel, in particular PCT/EPZOO8/067210 / 2007P20088WO3 the lambda-based percentage value of the alternative fuel.The lambda value is representative of an air-fuel ratio beforea combustion process in a combustion chamber of the internal combustion engine.
    In a further advantageous development, it is checked whether alambda probe of the internal combustion engine is usable. Thedetermined lambda value is determined in dependence upon adetermined deflection of a lambda controller, if the lambdaprobe is usable. Otherwise, the determined lambda value isdetermined in dependence upon a determined irregular runningvalue of the internal combustion engine. This makes itpossible to determine two lambda-based percentage values ofthe alternative fuel in different ways. The lambda controlleris provided for adjusting a defined lambda value, which isdetermined by the lambda probe. The deflection of the lambdacontroller is representative of an extent, to which the air-or fuel supply has to be changed in order for an actual lambdavalue to correspond to the defined lambda value. Thedetermined irregular running value of the internal combustionengine may be determined for example in dependence upon acomparison of cylinder~specific rotational speeds. Thecylinder-specific rotational speeds are representative ofangular velocities, at which a crankshaft of the internalcombustion engine travels a defined cylinder segment that is associated with a cylinder of the internal combustion engine.
    In a further advantageous development, a first lambda-basedpercentage value is determined in dependence upon thedetermined irregular running value. A second lambda-basedpercentage value is determined in dependence upon thedetermined deflection of the lambda controller. The reliable percentage value is determined in dependence upon the first PCT/EPZOO8/067210 / 2007P20088WO4 and the second determined lambda-based percentage value. Thismay contribute in a particularly simple manner towards aparticularly precise determination of the reliable percentage value.
    In a further advantageous development, an irregular-running-based percentage value of the alternative fuel is determinedin dependence upon an exceeding of a lean-running thresholdvalue of the internal combustion engine. This contributestowards a particularly precise determination of the reliablepercentage value. Determining the irregular-running-basedpercentage value of the alternative fuel in dependence uponthe exceeding of the lean-running threshold value represents afurther way of determining the percentage value. Fordetermining the irregular-running-based percentage value independence upon the exceeding of the lean-running thresholdvalue, the fuel mixture for one of the cylinders of theinternal combustion engine is made progressively leaner untilthe actual irregular running value exceeds the lean-runningthreshold value. Alternatively, one cylinder only may beoperated with a particularly lean mixture, preferably in sucha way that in the appropriate cylinder ignition no longeroccurs, and then the mixture in this cylinder is enricheduntil the fuel mixture in the appropriate cylinder ignitesonce more and/or until the lean-running threshold value is exceeded.
    For determining the irregular-running-based percentage value,the control Variable is the irregular running value of theinternal combustion engine, which is compared with the lean-running threshold value. In contrast thereto, for determiningthe lambda-based percentage value in dependence upon the irregular running value, the irregular running value is used PCT/EP2008/067210 / 2007P20088WO5 to determine the lambda value, in dependence upon which the lambda-based percentage value is then determined.
    In a further advantageous development, at a time soon after anengine start at least one of the lambda-based percentagevalues of the alternative fuel is determined. Afterdetermining the corresponding lambda-based percentage value orvalues of the alternative fuel, the irregular-running-basedpercentage value of the alternative fuel is determined. Independence upon the determined lambda-based percentage valuesand the determined irregular-running-based percentage value ofthe alternative fuel the reliable percentage value of thealternative fuel is determined. This contributes towards aparticularly precise determination of the reliable percentage value of the alternative fuel.
    In a further advantageous development, after detection of afuel-level change of a fuel level in a fuel tank of theinternal combustion engine between the determination of thelambda-based percentage values and the determination of theirregular-running-based percentage value, in dependence uponthe fuel-level change a fuel-level-based percentage value ofthe alternative fuel is determined. In dependence upon thedetermined lambda-based, the determined fuel-level-based andthe determined irregular-running-based percentage values thereliable percentage value is determined. This contributestowards a particularly precise correspondence of the reliablepercentage value to the actual percentage value of the alternative fuel.
    There now follows a detailed description of exemplaryembodiments of the invention with reference to diagrammatic drawings.
    PCT/EPZOO8/067210 / 2007P20088WO 6 The drawings show: Figure 1 an internal combustion engine, Figure 2 a first diagram, Figure 3 a second diagram, Figure 4 a third diagram, Figure 5 a flowchart of a first program for operating the internal combustion engine, Figure 6 a flowchart of a second program for operating the internal combustion engine.
    In all of the figures, elements of an identical construction or function are denoted by the same reference characters.
    An internal combustion engine (Figure 1) comprises an intaketract 1, an engine block 2, a cylinder head 3 and an exhaust gas tract 4.
    The intake tract 1 preferably comprises a throttle valve 5, acollector 6 and an intake manifold 7, which extends in thedirection of a cylinder Z1 through an inlet channel into acombustion chamber 9 of the engine block 2. The engine block2 further comprises a crankshaft 8, which is coupled by aconnecting rod 10 to the piston 11 of the cylinder Z1. Theinternal combustion engine comprises at least one cylinder Z1,preferably however further cylinders Z2, Z3, Z4, but may also comprise any desired larger number of cylinders Z1 to Z4. The PCT/EP2008/O672lO / 2007P20088WO7 internal combustion engine is disposed preferably in a motor vehicle.
    The cylinder head 3 comprises a valve gear 14, 15, which iscoupled to a gas inlet valve 12 and a gas outlet valve 13.The valve gear 14, 15 comprises at least one camshaft, whichis coupled to the crankshaft 8. An injection valve 18 and aspark plug 19 are further disposed in the cylinder head 3.Alternatively, the injection valve 18 may be disposed in theintake manifold 7. In the exhaust gas tract 4 a catalyticexhaust converter 21 is disposed, which preferably takes the form of a three-way catalytic converter.
    A fuel tank 50 is further provided, which is at leastpartially filled with a fuel mixture 52. The fuel mixture 52is metered to the combustion chamber 9 of the internalcombustion engine for a combustion process. The metering iseffected preferably by means of the injection valve 18. Thefuel mixture 52 comprises a basic fuel and an alternativefuel. The basic fuel is preferably petrol. The alternativefuel is preferably alcohol, for example ethanol. Thepercentage of alternative fuel is described by a percentagevalue ETH_PERC (Figure 2) of the alternative fuel and preferably lies between 0% and 85%.
    A control device 25 is provided, associated with which aresensors that acquire various measured variables and determinein each case the measured value of the measured variables.
    The control device 25 in dependence upon at least one of themeasured variables determines manipulated variables, which arethen converted into one or more actuating signals forcontrolling the final control elements by means of corresponding actuators. Operating variables of the internal PCT/EP2008/067210 / 2007P20088WO8 combustion engine comprise the measured variables or variablesderived from the measured variables. The control device 25may also be described as a device for operating the internal combustion engine.
    The sensors are for example a pedal position sensor 26 thatacquires an accelerator pedal position of an accelerator pedal27, an air-mass sensor 28 that acquires an air-mass flowupstream of the throttle valve 5, a throttle-valve positionsensor 30 [that] acquires an opening angle of the throttlevalve 5, an intake-air temperature sensor 32 that acquires anintake-air temperature, an intake-manifold pressure sensor 34that acquires an intake-manifold pressure in the collector 6,a crankshaft-angle sensor 36 that acquires a crankshaft angle,with which a rotational speed of the internal combustionengine is then associated. A lambda probe 42 is furtherprovided, which is disposed upstream of the catalytic exhaustconverter 21 and acquires for example the residual oxygencontent of the exhaust gas and the measuring signal of whichis characteristic of the air-fuel ratio in the combustionchamber 9 of the cylinder Zl before the combustion process.An exhaust-gas temperature sensor 44 may be provided for acquiring an exhaust-gas temperature.
    Depending on the form of implementation of the invention, anydesired subset of the described sensors may be provided or additional sensors may also be provided.
    The final control elements are for example the throttle valve5, the gas inlet- and gas outlet valves 12, 13, the injection valve 18 and/or the spark plug 19.
    PCT/EPZOO8/067210 / 2007P20088WO9 For full combustion of a defined fuel mixture mass in thecombustion chamber 9 a fresh-air mass is required, which isdependent upon the percentage value ETH_PERC of thealternative fuel. Determining the percentage value ETH_PERCof the alternative fuel may therefore contribute towards fullcombustion of the fuel mixture 52 metered to the combustionchamber 9. This contributes towards a particularly low- emission operation of the internal combustion engine.
    A first diagram (Figure 2) shows a variation of the percentagevalue ETH_PERC of the alternative fuel as a function of timeT. The represented percentage value ETH_PERC of thealternative fuel in this case refers to the fuel mixture 52that is actually metered to the combustion chamber 9 for thecombustion process. At the start of the first diagram a fuellevel in the fuel tank 50 is raised by introducing the fuelmixture 52 into the tank 50. The fuel mixture preferably hasan alternative fuel component of 0% to 85%. In dependenceupon the alternative fuel percentage of the fuel mixture 52that is introduced into the fuel tank 50, the percentage valueETH_PERC of the alternative fuel changes from an originalpercentage value ETH_IN to an altered percentage valueETH_FIL. If the fuel tank 50 prior to refueling was notempty, the introduced fuel mixture 52 mixes with the fuelmixture 52 in the tank. This has an effect, after a delay ofseveral crankshaft revolutions, upon the fuel mixture 52 thatis actually metered to the combustion chamber 9 because thereis still old fuel mixture 52 situated in the supply lines tothe injection valves 18 and optionally in a fuel rail and thisfuel mixture 52 only gradually mixes with the newly introduced fuel mixture 52.
    PCT/EP2008/067210 / 2007P20088WO Shortly after an engine start ENG_ST of the internalcombustion engine a lambda-based percentage valuedetermination LAMB is started. The lambda-based percentagevalue determination LAMB preferably has a Validation areaVALID at the end of the lambda-based percentage valuedetermination LAMB, in which the lambda-based percentage valuedetermination is particularly precise. The lambda-basedpercentage value determination LAMB is preferably followed by an irregular-running-based percentage value determination ER.
    The lambda-based percentage value determination LAMB maycomprise a lambda-based percentage value determinationLAMB_ERU by means of irregular running determination and/or alambda-based percentage value determination LAMB_LAM by meansof lambda probe 42 (Figure 3). If the lambda probe 42 isready to use, preferably the lambda-based percentage valuedetermination LAMB_LAM by means of lambda probe 42 is carriedout. Preferably for this purpose a lambda value is determinedby means of the lambda probe 42. The lambda value isrepresentative of the air-fuel ratio of the air-fuel mixturebefore the combustion process in the combustion chamber 9.
    For this purpose, the lambda probe 42 acquires a residualoxygen content of an exhaust gas of the internal combustionengine, in dependence upon which the air-fuel ratio before thecombustion process may be determined. In dependence upon thepercentage of alternative fuel the residual oxygen content ofthe exhaust gas also changes, which leads to a change of thelambda value. Thus, in dependence upon the determined lambda value the percentage of alternative fuel may be inferred.
    Additionally or alternatively, for example if the lambda probe42 is not ready to use, the lambda-based percentage value determination LAMB_ERU may be carried out by means of PCT/EP2008/067210 / 2007P20088WOll irregular running determination. The lambda-based percentagevalue determination LAMB_ERU by means of irregular runningdetermination comprises a determination of the irregularrunning value. The irregular running value is determined independence upon cylinder-specific rotational speeds of thecrankshaft 8 of the internal combustion engine. For example,angular velocities, at which the crankshaft 8 crosses adefined crankshaft segment that is associated with a definedcylinder Zl to Z4, are determined. By comparing a pluralityof angular velocities for different crankshaft segments thatare associated with different cylinders Zl to Z4, theirregular running value is determined. The cylinder-specificangular Velocity of the crankshaft 8 is dependent upon theair-fuel ratio of the fuel mixture 52 metered to thecorresponding cylinder. Thus, in dependence upon thedetermined irregular running value the lambda value of theinternal combustion engine may be determined. By means of thedetermined lambda value it is then possible in turn to carryout the lambda-based percentage value determination LAMB. Thelambda-based percentage value determination by means of lambdaprobe 42 is started preferably when a state of readiness for use LAM_REA of the lambda probe 42 is detected.
    For the irregular-running-based percentage value determinationER first the irregular-running value is also determined, butthe lambda value is not determined in dependence thereon. InContrast thereto, for the irregular-running-based percentagevalue determination ER the air-fuel mixture of at least one ofthe cylinders Zl to Z4 is made progressively leaner until theirregular running value resulting therefrom exceeds a definedlean~running threshold value. The higher the percentage ofalternative fuel, the leaner the mixture may be made without the defined lean~running threshold value being exceeded.
    PCT/EP2008/067210 / 2007P20088WO12 Thus, in dependence upon the exceeding of the lean-runningthreshold value by the irregular running value the irregular-running-based percentage value determination ER may be carried out.
    Alternatively, the air-fuel mixture of at least one of thecylinders Zl to Z4 may be made lean enough for the lean-running threshold value to be reliably exceeded. The air-fuelmixture may then be enriched until the lean-running thresholdvalue is exceeded. On the basis of the exceeding of the lean-running threshold value by the irregular running value, theirregular-running-based percentage value determination ER maythen be carried out. Further or comparable irregular-running-based percentage value determinations ER are disclosed in US 629 88 38 Bl and US 595 05 99 Al.
    Preferably, between the lambda-based percentage valuedetermination LAMB and the irregular-running-based percentagevalue determination ER a fuel-level-based percentage valuedetermination FTL is carried out (Figure 4). A comparablefuel-level-based percentage value determination is disclosedin US 595 O5 99 Al. In this case, in dependence upon a fuellevel change of the fuel mixture 52 in the tank 50 and independence upon a maximum or minimum percentage value of thesubsequently introduced fuel, for example 0% to 85%, a maximumor minimum possible percentage value of the alternative fuelis determined. This may then be compared with a result of alambda-based percentage value determination LAMB, with themaximum or minimum percentage value being used as the actualpercentage value, which lies closer to the result of the lambda-based percentage value determination LAMB.
    PCT/EP2008/067210 / 2007P20088WO13 On a storage medium of the control device 25 preferably afirst program for operating the internal combustion engine isstored (Figure 5). The first program is used to determine a reliable percentage value ETH_SAV of the alternative fuel.
    The first program is preferably started in a step Sl, in which optionally variables are initialized.
    In a step S2 a lambda-based percentage value ETH_LAMB isdetermined by means of the lambda-based percentage valuedetermination LAMB. In the course of step S2 the steps S3 and S4 may be executed.
    In step S3, by means of the lambda-based percentage valuedetermination LAMB_ERU by means of irregular runningdetermination a first lambda-based percentage valueETH_LAMB_ERU is determined. For example, in that independence upon the determined irregular running value thelambda value is determined and in that in dependence upon thedetermined lambda value the first lambda-based percentagevalue ETH_LAMB_ERU is determined, for example by means of oneor more characteristic maps. The characteristic map or mapsor optionally further characteristic maps may be recorded for example on an engine test bed.
    Alternatively or additionally, in the step S4 a second lambda~based percentage value ETH_LAMB_LAM may be determined by meansof the lambda-based percentage value determination LAMB_LAM bymeans of the lambda probe 42. For example, in that theresidual oxygen content of the exhaust gas is acquired bymeans of the lambda probe 42 and in that in dependence uponthe acquired residual oxygen content the lambda value is determined and in that in dependence upon the determined PCT/EP2008/067210 / 2007P20088WO14 lambda value the second lambda-based percentage valueETH_LAMB_LAM is determined, for example by means of a further characteristic map.
    The lambda-based percentage value ETH_LAMB comprises the firstand/or the second lambda-based percentage value ETH_LAMB_ERU,ETH_LAMB_LAM. Alternatively, the lambda-based percentagevalue ETH_LAMB may be determined in dependence upon the firstand the second lambda-based percentage value ETH_LAMB_ERU, ETH_LAMB_LAM, for example by generating a mean value.
    In a step S5, by means of the fuel-level-based percentagevalue determination FTL a fuel-level-based percentage value ETH_FTL may be determined.
    Preferably, in a step S6 by means of the irregular-running-based percentage value determination ER an irregular-running-based percentage value ETH_ER is determined. If steps S3 and S4 are executed, step S6 may alternatively be omitted.
    In a step S7, in dependence upon the determined lambda-basedpercentage value or values ETH_LAMB, the determined fuel-level-based percentage value ETH_FTL and the determinedirregular-running-based percentage value ETH_ER the reliablepercentage value ETH_SAV is determined, preferably inaccordance with the calculation specification indicated in thestep S7. According to this calculation specification a sumSUM is generated by means of products of individual percentagevalues ETH_PERC and corresponding trust values TRUST_VAL.
    This sum SUM is then divided by the sum SUM of the trustvalues TRUST_VAL. The trust values TRUST_VAL may for examplebe permanently defined for each percentage value ETH_PERC.Alternatively, some of the trust values TRUST_VAL or all of PCT/EP2008/067210 / 2007P20088WO the trust values TRUST_VAL may be determined in dependenceupon operating variables of the internal combustion engine.For example, the trust value TRUST_VAL after validation may beset higher for the corresponding lambda-based percentage valuethan before or without corresponding validation. Furthermore,the trust value TRUST_VAL may be all the higher, the morefrequently the corresponding percentage value determinationwas carried out within a defined time frame. The percentagevalues ETH_PERC comprise the lambda-based percentage valuesETH_LAMB, the fuel-level-based percentage value ETH_FTL and the irregular-running-based percentage value ETH_ER.
    In a step S8, the first program may be terminated.Preferably, however, the first program is executed regularlyduring operation of the internal combustion engine, particularly when the fuel level change is detected.
    On a storage medium of the control device 25 a second programfor determining the reliable percentage value ETH_SAV ispreferably stored (Figure 6). The second program, like thefirst program, is used for particularly precise determinationof the reliable percentage value ETH_SAV. The second programmay be an independent program or represent a summarizing of the first program.
    The second program is preferably started in a step S11, in which optionally variables are initialized.
    In a step S12 the ready-to-use state LAM_REA of the lambdaprobe 42 is checked. If the condition of step S12 is met,this is representative of the lambda probe 42 being ready touse and the second program is further executed in a step S14.
    If the condition of step S12 is not met, this is PCT/EP2008/067210 / 2007P20088WO16 representative of the lambda prove 42 not being ready to use and the second program is continued in a step S13.
    In step S13, by means of the lambda-based percentage valuedetermination LAMB_ERU by means of the irregular runningdetermination the first lambda-based percentage value ETH_LAMB_ERU is determined.
    In step S14, by means of the lambda-based percentage valuedetermination LAMB_LAM by means of the lambda probe 42 thesecond lambda-based percentage value ETH_LAMB_LAM of the alternative fuel is determined.
    In a step S15, preferably at least one validation conditionVAL_CON is checked. The validation condition VAL_CONcomprises for example that a cooling-water temperature isgreater than a defined cooling-water temperature thresholdvalue and/or that an oil temperature value is greater than adefined oil temperature threshold value. Alternatively oradditionally the validation condition VAL_CON may be regardedas met if the internal combustion engine is in quasi-stationary operation and/or in a lower load range of theinternal combustion engine. If the condition of step S15 ismet, then the lambda-based percentage value determination LAMBis carried out at least one more time and then terminated. Ifthe condition of step S15 is not met, then step S14 is executed afresh.
    In a step S16 the fuel-level-based percentage value ETH_FTL is determined.
    In a step S17 the irregular-running-based percentage value ETH_ER is determined.
    PCT/EP2008/067210 / 2007P20088WO 17 In a step S18 the reliable percentage value ETH_SAV isdetermined, for example in accordance with step S7 of the first program.
    In a step S19 the second program may be terminated.Preferably, however, the second program is executed regularlyduring operation of the internal combustion engine, in particular after a fuel level change.
    权利要求:
    Claims (8)
    [1] 1. PCT/EPZOO8/067210 / 2007P20088WO 18 Claims: l. A method of operating an internal combustion engine that isoperable with a fuel mixture (52) comprising a basic fueland an alternative fuel, whereby percentage values(ETH_PERC) of the alternative fuel are determined in atleast two different ways and whereby in dependence upon thedifferently determined percentage values (ETH_PERC) areliable percentage value (ETH_SAV) of the alternative fuel is determined. The method as claimed in claim 1, whereby a lambda-basedpercentage value (ETH_LAM) of the alternative fuel isdetermined in dependence upon a determined lambda value of the internal combustion engine. The method as claimed in claim 2, whereby it is checkedwhether a lambda probe (42) of the internal combustionengine is ready to use, and whereby the determined lambdavalue is determined in dependence upon a determineddeflection of a lambda controller if the lambda probe (42)is usable, and whereby otherwise the determined lambdavalue is determined in dependence upon a determined irregular running value of the internal combustion engine. The method as claimed in claim 3, whereby a first lambda-based percentage value (ETH_LAMB_ERU) is determined independence upon the determined irregular running value andwhereby a second lambda-based percentage value is determined in dependence upon the (42) and (ETH_LAMB_LAM)determined deflection of the lambda controllerwhereby the reliable percentage value (ETH_SAV) is determined in dependence upon the first and the second PCT/EPZOO8/067210 / 2007P20088WO19 determined lambda-based percentage value (ETH_LAMB_ERU,ETH_LAMB_LAM). 5. The method as claimed in one of the preceding claims,whereby an irregular-running-based percentage value(ETH_ER) of the alternative fuel is determined independence upon an exceeding of a lean-running threshold value of the internal combustion engine. 6. The method as claimed in claim 5, whereby at a time soonafter an engine start (ENG_ST) at least one of the lambda-based percentage values (ETH_LAMB) of the alternative fuelis determined and whereby after determination of thecorresponding lambda-based percentage value or values(ETH_LAMB) of the alternative fuel the irregular-running-based percentage value (ETH_ER) of the alternative fuel isdetermined and whereby in dependence upon the determinedlambda-based percentage values (ETH_LAMB) and thedetermined irregular-running-based percentage value(ETH_ER) of the alternative fuel the reliable percentage value (ETH_SAV) of the alternative fuel is determined. 7. The method as claimed in claim 6, whereby, after detectionof a fuel level change of a fuel level in a fuel tank (50)of the internal combustion engine between the determinationof the lambda-based percentage values (ETH_LAMB) and thedetermination of the irregular-running-based percentagevalue (ETH_ER), in dependence upon the fuel level change afuel-level-based percentage value (ETH_FTL) of thealternative fuel is determined and whereby in dependenceupon the determined lambda-based, the determined fuel-level-based and the determined irregular-running-based percentage values (ETH_LAMB, ETH_FTL, ETH_ER) the reliable PCT/EP2008/O672lO / 2007P20088WO percentage value (ETH_SAV) is determined. 8. A.device for operating an internal combustion engine thatis operable with a fuel mixture (52) comprising a basicfuel and an alternative fuel, wherein the device isdesigned to determine percentage values (ETH_PERC) of thealternative fuel in at least two different ways and todetermine a reliable percentage value (ETH_SAV) of thealternative fuel in dependence upon the differently determined percentage values (ETH_PERC).
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102008005883A|DE102008005883B4|2008-01-24|2008-01-24|Method and device for operating an internal combustion engine|
    PCT/EP2008/067210|WO2009092496A1|2008-01-24|2008-12-10|Method and device for operating an internal combustion engine|
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