CN104421032A - Humidity and fuel alcohol content estimation - Google Patents
Humidity and fuel alcohol content estimation Download PDFInfo
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- CN104421032A CN104421032A CN201410413532.8A CN201410413532A CN104421032A CN 104421032 A CN104421032 A CN 104421032A CN 201410413532 A CN201410413532 A CN 201410413532A CN 104421032 A CN104421032 A CN 104421032A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
- F02D19/082—Premixed fuels, i.e. emulsions or blends
- F02D19/084—Blends of gasoline and alcohols, e.g. E85
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
- F02D19/082—Premixed fuels, i.e. emulsions or blends
- F02D19/085—Control based on the fuel type or composition
- F02D19/087—Control based on the fuel type or composition with determination of densities, viscosities, composition, concentration or mixture ratios of fuels
- F02D19/088—Control based on the fuel type or composition with determination of densities, viscosities, composition, concentration or mixture ratios of fuels by estimation, i.e. without using direct measurements of a corresponding sensor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
- F02D41/1456—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio with sensor output signal being linear or quasi-linear with the concentration of oxygen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
- F02D41/1458—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio with determination means using an estimation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/417—Systems using cells, i.e. more than one cell and probes with solid electrolytes
- G01N27/4175—Calibrating or checking the analyser
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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
- 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
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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
- F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
- F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/005—Controlling exhaust gas recirculation [EGR] according to engine operating conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/45—Sensors specially adapted for EGR systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/045—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions combined with electronic control of other engine functions, e.g. fuel injection
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- 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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Abstract
The invention relates to a humidity and fuel alcohol content estimation. Methods and systems for an engine system including an exhaust gas sensor are disclosed. In one example, under a first engine fueling condition, an air-fuel ratio correction factor is determined based on an expected air-fuel ratio and an actual air-fuel ratio. During a second engine fueling condition and a third engine non-fueling condition, fuel alcohol content and ambient humidity, respectively, are determined based on the exhaust gas sensor and corrected based on the air-fuel ratio correction factor.
Description
The cross reference of related application
The application is the U.S. Patent Application No. 13/953 submitted on July 29th, 2013, the part continuation application of 621, U.S. Patent Application No. 13/953, 621 is the U.S. Patent Application No. 12/781 submitted on May 17th, 2010, 328, present U.S. Patent number 8, 495, the part continuation application of 996, U.S. Patent number 8, 495, 996 is the U.S. Patent Application No. 12/631 submitted on December 4th, 2009, the part continuation application of 013, and the application is the U.S. Patent Application No. 12/631 submitted on December 4th, 2009, the part continuation application of 013, in order to all objects, by these whole contents of applying for by reference to being incorporated to herein.
Technical field
The application is broadly directed to the exhaust sensor of the vent systems being connected to internal-combustion engine.
Background technique
Exhaust sensor can run the instruction providing various exhaust gas composition.Such as, U.S.5,145,566 describe the water content detected in exhaust.The water content utilizing exhaust gas oxygen sensor to estimate can be used for knowing by inference the ambient humidity of motor run duration.In other method, water content can be used for knowing by inference the fuel alcohol content of the fuel burnt in motor.
But inventor has realized that profit potential problems in this way at this.Particularly, the change of exhaust air-fuel ratio can affect the output of lambda sensor, obscures the result known by inference.Particularly, when being vented fuel ratio stoichiometric proportion and being dense, when the voltage applied exports pumping current higher than during desired voltage by lambda sensor.The error of pumping current causes the error of corresponding humidity and the estimation of fuel alcohol content.Due to the factor that humidity and fuel alcohol content are the engine operating parameters determining such as emitted dose, EGR amount etc., the error that therefore humidity and fuel alcohol content are estimated can be converted into and make worsening engine performance.In certain methods, air-fuel ratio may be controlled to target air-fuel ratio, and water content is estimated only just to carry out when air-fuel ratio is in desired value.But this not only depends on accurate air-fuel ratio and controls, but also need can fuel to be done be had to adapt to before estimating at water content.As a result, between the long fuel laundering period, water content is estimated to be delayed by.
Summary of the invention
Therefore, in one example in which, some problems above can be solved by a kind of method for motor, the method comprises, at the first motor for during fuel condition, the first voltage is applied to exhaust sensor, and know air-fuel ratio correction factor according to sensor output.And, during first supplies fuel condition for the second motor after fuel condition, first voltage is applied to this sensor and to apply between the second voltage alternately, and to export according to the sensor at the first and second voltage places and the correction factor known estimates the fuel alcohol content that sprays.
Therefore, in one example in which, this sensor can be revised export with the change of make-up air-fuel ratio.Particularly, in response to the applying of the first and second voltages, the first and second pumping current can be produced.This first pumping current can represent the amount of the oxygen in sample gas, and the amount of the oxygen that the second pumping current can represent in sample gas adds the amount of the oxygen in the water molecule be included in this sample gas.So this first and second pumping current can be revised with the deviation of the air-fuel ratio (air-fuel ratio of motor actual motion) estimated according to the air-fuel ratio of expection (thinking that the air that motor is just running fires-material ratio).Then the value of this correction can be used for calculating water content, and knows the alcohol content of the fuel of ambient humidity and burning by inference with higher precision and reliability.
By this way, be vented water content estimate and fuel alcohol content determine can promptly and accurately carry out and do not require that air-fuel ratio controls.Particularly, can this estimation be carried out and not require air-fuel ratio accurately to control to desired value.In other words, the method is revised the air-fuel ratio being different from desired value instead of air-fuel ratio is controlled to desired value.Therefore, this allows water and alcohol content to estimate can carry out and not require that completing fuel to accurate open loop for fuel adapts to.Inventor has realized that, by utilizing same exhaust sensor determination ambient humidity (such as, when motor is without during for operating fuel, such as during deceleration fuel cutoff), fuel alcohol content (such as, during condition except after again refueling except fuel tank) and exhaust air-fuel is than correction factor (such as, when motor is for operating fuel), parts can be realized and reduce benefit.
It should be understood that and provide general introduction to be above that it further describes in a specific embodiment in order to introduce some concepts in a simple form.This and do not mean that the key determining theme required for protection or basic feature, subject area required for protection is limited uniquely by the claim after embodiment of enclosing.And theme required for protection is not limited to the mode of execution of any shortcoming above solution or in the disclosure mentioned by any part.
Accompanying drawing explanation
Fig. 1 illustrates the schematic diagram of the motor comprising vent systems and exhaust sensor.
Fig. 2 illustrates the schematic diagram of exemplary exhaust sensor.
Fig. 3 illustrates the flow chart of the program illustrated for knowing air-fuel ratio correction factor.
Fig. 4 illustrates the amount and the ambient humidity that illustrate and accurately estimate the alcohol in fuel for exhaust sensor, revises the flow chart of the program of the impact on air-fuel ratio change simultaneously.
Fig. 5 illustrates the flow chart of the program illustrated for controlling motor according to exhaust sensor.
Fig. 6 illustrates the plotted curve that the water in being vented and the relation between ethanol are described.
Fig. 7 illustrates that description air-fuel ratio and engine temperature are on the plotted curve of the impact that alcohol fuel is estimated.
Fig. 8 illustrates the plotted curve describing and air-fuel ratio is affected to the pumping current signal revised.
Embodiment
Description below relates to a kind of method for determining the amount of the alcohol in fuel mixture (such as ethanol and gasoline) according to the output from the exhaust sensor of such as lambda sensor.This exhaust sensor can be used for the amount of the water determined in sample gas, and it represents the amount of the water in the exhaust when measuring.Such as, the first voltage can be applied to this sensor, with the air-fuel ratio determination air-fuel ratio error according to the air-fuel ratio of expecting and reality.Then the first and second voltages can alternately be applied to this sensor, to produce the first and second pumping current (such as, sensor exports).Under the motor of such as deceleration fuel cutoff does not supply fuel condition, the output of this sensor can be carried out revising according to this air-fuel ratio correction factor and be used for producing the instruction of ambient humidity.At motor for during fuel condition, this sensor exports and can revise according to this air fuel ratio correction factor, and is used for determining the amount with the water in the exhaust that the amount of the alcohol in fuel mixture is proportional together with ambient humidity.In one example in which, the engine operating parameter of such as spark timing and/or fuel injection amount can regulate according to the amount of the alcohol in the fuel detected.By this way, can keep or improve engine performance, fuel economy and/or discharge, although the amount change of the alcohol in fuel.
With reference now to Fig. 1, Fig. 1, the schematic diagram of a cylinder of multicylinder engine 10 is shown, this motor 10 can be included in the propulsion system of automobile.Motor 10 can by comprising the control system of controller 12 and controlling at least in part by via the input of input device 130 from vehicle operators 132.In this example, input device 130 comprises accelerator pedal and the pedal position sensor 134 for generation of proportional pedal position signal PP.The firing chamber (that is, cylinder) 30 of motor 10 can comprise piston 36 and be set up chamber wall 32 wherein.This piston 36 can be connected to bent axle 40 the to-and-fro motion of this piston to be transformed into the rotary motion of bent axle.Bent axle 40 can be connected at least one driving wheel of vehicle via intermediate gearbox system.And starter motor can be connected to bent axle 40 via flywheel, so that the starting operation of motor 10 can be realized.
Firing chamber 30 can receive the inlet air from intake manifold 44 via gas-entered passageway 42 and can discharge the gas of burning via exhaust passage 48.Intake manifold 44 selectively can be communicated with firing chamber 30 with exhaust valve 54 via respective intake valve 52 with exhaust passage 48.In certain embodiments, firing chamber 30 can comprise two or more than the intake valve of two and/or two or more than the exhaust valve of two.
In this example, intake valve 52 and exhaust valve 54 can be controlled by cam-actuated via corresponding cam-actuated system 51 and 53.Each in cam-actuated system 51 and 53 can comprise one or more cam and can utilize operated by controller 12 cam profile conversion (CPS), variable cam timing (VCT), one or more in Variable Valve Time (VVT) and/or lift range variable (VVL) system, run to change valve.The position of intake valve 52 and exhaust valve 54 can be determined by position transducer 55 and 57 respectively.In alternative embodiments, intake valve 52 and/or exhaust valve 54 can by electronics valve actuator control.Such as, cylinder 30 can alternately comprise via the intake valve of electronics valve actuator control with via the exhaust valve of cam-actuated control comprising CPS and/or VCT system.
In certain embodiments, each cylinder of motor 10 can be configured with the one or more fuel injectors providing fuel to it.As nonrestrictive example, cylinder 30 is illustrated and comprises a fuel injector 66.Fuel injector 66 is illustrated and is directly connected in cylinder 30, for injecting fuel directly into wherein with the pulse width FPW of the signal received from controller 12 is proportional.By this way, fuel injector 66 provides the direct injection of the fuel be called as to firing chamber 30 (being also called hereinafter " DI ").
It should be understood that in alternative embodiment, sparger 66 can be the passage injector be supplied to by fuel in the intake duct of cylinder 30 upstream.It should be understood that cylinder 30 can receive the fuel from multiple sparger, such as multiple passage injector, multiple direct sparger or its combination.
Fuel tank in fuel system 172 can keep the fuel with different fuel quality, such as, and different propellant compositions.These differences can comprise different alcohol content, different octanes, different vaporization heat, different fuel mixtures and/or its combination etc.This motor can utilize the alcohol of the fuel mixture comprising such as E85 (it is the ethanol of about 85% and the gasoline of 15%) or M85 (it is the methyl alcohol of about 85% and the gasoline of 15%).Alternately, depend on the alcohol content being supplied to the fuel of fuel tank by operator, this motor can utilize the gasoline of other ratios be stored in fuel tank and the mixture of alcohol to run, and comprises the gasoline of 100% and the ethanol of 100%, and ratio variable in-between.And the fuel characteristic of fuel tank can frequent variations.In one example in which, driver can one day with E85 filled with fuel case again, next sky E10, then next sky E50.Therefore, according to level and the composition of the fuel remained on when filling again in this fuel tank, fuel tank composition can dynamically change.
In fuel tank fills, the change of every day can therefore, it is possible to cause the propellant composition of the fuel frequently changed in fuel system 172.Therefore, composition and/or the fuel quality of the fuel carried by sparger 66 is affected.The different propellant composition of being sprayed by sparger 66 can be called fuel type at this.In one example in which, different propellant compositions can be described qualitatively by its research octane number (RON) (RON) grade, alcohol percentage, ethanol percentage etc.
Be understood that, although in one embodiment, motor can run by spraying variable fuel mixture via direct sparger, but in alternative embodiment, this motor can utilize two spargers and change and run from the relative quantity of the injection of each sparger.Be to be further appreciated that, when utilizing the booste operation motor from the increasing apparatus of such as turbosupercharger or mechanical supercharger (not shown), along with the increase of the alcohol content of variable fuel mixture, boosting restriction can increase.
Continue with reference to figure 1, gas-entered passageway 42 can comprise the closure 62 with Rectifier plate 64.In the example that this is concrete, the position of Rectifier plate 64 via being supplied to electric motor or including the signal of actuator (one is commonly called Electronic Throttle Control (ETC) structure) of closure 62, can be changed by controller 12.By this way, closure 62 can run, to change the inlet air being supplied to firing chamber 30 and other engine cylinders.The position of Rectifier plate 64 can be supplied to controller 12 by throttle position signal TP.Gas-entered passageway 42 can comprise mass air flow sensor 120 and Manifold Air Pressure sensor 122, for providing corresponding signal MAF and MAP to controller 12.
Under the operating mode selected, the spark advance signal SA that ignition system 88 responds self-controller 12 provides ignition spark to firing chamber 30 via spark plug 92.Although spark ignition parts are illustrated, in certain embodiments, other firing chambers one or more of firing chamber 30 or motor 10 with ignition by compression mode operation, can have or not have ignition spark.
Exhaust sensor 126 is illustrated the exhaust passage 48 being connected to emission control system 70 upstream.Sensor 126 can be any suitable sensor of the instruction for providing evacuating air/fuel ratio, such as linear oxygen sensors or UEGO (general or wide area exhaust oxygen), bifurcation lambda sensor or EGO, HEGO (EGO of heating), NOx, HC or CO sensor.The downstream that emission control system 70 is illustrated in exhaust sensor 126 is arranged along exhaust passage 48.Device 70 can be three-way catalyst (TWC), NOx trap, various other emission control system or its combination.In certain embodiments, at the run duration of motor 10, emission control system 70 can by run at least one engine cycle of motor in specific air/fuel ratio resetting.
And in the disclosed embodiment, the discharge portion of hope can be routed to gas-entered passageway 44 from exhaust passage 48 via EGR channel 140 by exhaust gas recirculatioon (EGR) system.The amount being supplied to the EGR of gas-entered passageway 44 can be changed by controller 12 via EGR valve 142.And EGR sensor 144 can be arranged in EGR channel and can to provide the one or more instructions in the pressure of this exhaust, temperature and concentration.In some conditions, egr system can be used for regulating the temperature of air in firing chamber and fuel mixture, during some combustion modes, therefore provide the method controlling ignition timing.And during some conditions, a part of combustion gas by controlling exhaust valve timing, such as, by controlling Variable Valve Time gear, can keep or catching in a combustion chamber.
Controller 12 is shown as microcomputer in FIG, comprising: microprocessor unit (CPU) 102, input/output end port (I/O) 104, show in the example that this is concrete for the electronic storage medium for executable program and corrected value of ROM (read-only memory) (ROM) chip 106, random access memory (RAM) 108, keep-alive storage (KAM) 110 and data/address bus.Controller 12 can receive the various signals from the sensor being connected to motor 10, except those signals above-mentioned, also comprises: from the measurement of the quality air stream (MAF) that mass air flow sensor 120 is introduced; From the engine coolant temperature (ECT) of temperature transducer 112 being connected to cooling cover 114; From the PIP Profile Igntion PickUp signal (PIP) of hall effect sensor 118 (or other types) being connected to bent axle 40; From the throttle position (TP) of throttle position sensor; And carry out the absolute manifold pressure signal MAP of sensor 122.Engine rotational speed signal RPM can be produced from signal PIP by controller 12.
Storage medium ROM (read-only memory) 106 can utilize mechanized data and participation but other variable programme specifically do not listed, and this mechanized data represents for performing method described below by the executable instruction of processor 102.
As mentioned above, Fig. 1 only illustrates a cylinder of multicylinder engine, and each cylinder can comprise its oneself a set of intake valve/exhaust valve, fuel injector, spark plug etc. equally.
Secondly, Fig. 2 illustrates and is configured to measure the oxygen (O in exhaust stream
2) the schematic diagram of one exemplary embodiment of UEGO sensor 200 of concentration.Such as, sensor 200 can be operating as the UEGO sensor of Fig. 1.Sensor 200 comprises with the multilayer of one or more stupaliths of stacked structure setting.In the embodiment of fig. 2, five ceramic layers are illustrated as layer 201,202,203,204 and 205.These layers comprise can one or more layers solid electrolyte of conducting ion oxygen.The example of suitable solid electrolyte includes, but not limited to the material of Zirconium oxide.And in certain embodiments, heater 207 can arrange in the mode of thermal communication the ionic conductivity increasing each layer with each layer.Although illustrate that UEGO sensor is formed by five ceramic layers, it should be understood that UEGO sensor can comprise the ceramic layer of other suitable number.
Layer 202 comprises the material or multiple material that form the evolving path 210.The evolving path 210 is configured in exhaust introducing first inner chamber 222 via diffusion.The evolving path 210 can be configured to one or more compositions allowing exhaust, includes but not limited to analyte (such as, the O wished
2) be diffused in inner chamber 222, its diffusion rate can be pumped electrode pair 212 and 214 pumping than analyte to enter or the more restricted speed of the speed that pumps out.By this way, O can be obtained in the first inner chamber 222
2stoichiometric proportion level.
Sensor 200 also comprises the second inner chamber 224 in layer 204 that tegillum 203 separates with the first inner chamber 222.This second inner chamber 224 is configured to the constant oxygen local compression keeping equaling stoichiometric conditions, and such as, the oxygen level be present in the second inner chamber 224 equals the level being vented the oxygen had when air-fuel ratio is stoichiometric proportion.Oxygen concentration in second inner chamber 224 is by pumping voltage V
cpremain unchanged.Herein, the second inner chamber 224 can be called as reference chamber.
A pair sense electrode 216 with 218 to arrange with the mode that the first inner chamber 222 is communicated with reference chamber 224.Sense electrode detects because the oxygen concentration in exhaust causes forming concentration gradient between the first inner chamber 222 and reference chamber 224 higher or lower than stoichiometric proportion level 216 and 218.High oxygen concentration can be caused by rare exhaust mixture, and low oxygen concentration can be caused by dense mixture.
A pair pumping electrode 212 is arranged in the mode be communicated with inner chamber 222 with 214, and be configured to electrochemically pumping from inner chamber 222 by layer 201 and from sensor 200 out selected by gas component (such as, O
2).Alternately, this can be configured to pumping electrode 212 and 214 gas that electrochemically pumping selects and be entered in inner chamber 222 by layer 201.Here, pumping electrode pair 212 and 214 can be called as O
2pumping chamber.
Electrode 212,214,216 and 218 can be made up of various suitable material.In certain embodiments, electrode 212,214,216 and 218 can be made with the material impelling molecular oxygen to decompose at least in part.The example of this material includes but not limited to, comprises the electrode of platinum and/or gold.
Oxygen is electrochemically pumped out or is pumped to from inner chamber 222 inner chamber 222 and is included in pumping electrode pair 212 and 214 two ends applying voltage V
p.Put on O
2the pumping voltage V of pumping chamber
poxygen be pumped into the first inner chamber 222 or pump out from the first inner chamber 222, so that the stoichiometric proportion level of the oxygen in holding chamber pumping chamber.The pumping current I produced
pproportional with the concentration of the oxygen in exhaust.Control system (Fig. 2 is not shown) produces pumping current signal I
p, it is as pumping voltage V stoichiometric proportion horizontal dimension being held in applying required in the first inner chamber 222
pthe function of density.Therefore, lean mixture will make oxygen pump out from inner chamber 222, and dense mixture makes oxygen be pumped into inner chamber 222.
It should be understood that UEGO sensor as described herein is only the one exemplary embodiment of UEGO sensor, and additional and/or alternative feature and/or design can be had in other embodiments of UEGO sensor.
As amount and the ambient humidity of the alcohol in the fuel that can advantageously be used for estimating to burn within the engine the following detailed description of, the UEGO sensor of Fig. 2.Particularly, the change (△ Ip) of the pumping current exported by this sensor at two different reference potential places is used for determining from water and/or CO
2the amount of the oxygen decomposed.But inventor has realized that exhaust air-fuel than changing this △ Ip signal at this.This makes the relation be difficult between the amount of the water accurately determined in this △ Ip signal and exhaust.
Fig. 7 illustrates the plotted curve 700 describing the impact that air-fuel comparison alcohol fuel is estimated.Each in curve 702-706 illustrates the relation between the ethanol content of the fuel of pumping current and the burning exported by this sensor.Curve 704 illustrates this relation with approximate stoichiometry air-fuel ratio, and curve 702 illustrates this relation with rare air-fuel ratio, and curve 706 illustrates this relation with dense air-fuel ratio.When exhaust air-fuel ratio thicken exceed stoichiometric proportion time, the pumping current exported by this sensor for given alcohol fuel concentration reduces.If utilize uncorrected pumping current, the concentration of alcohol of estimation will higher than in esse concentration.Such as, when running with alcohol fuel E45, this △ Ip expection is less than the △ Ip run with E55.But, exist dense exhaust air-fuel than time, the △ Ip estimated when E45 can higher than the △ Ip of E55.Therefore, inventor has realized that, by know actual air-fuel ratio and the change of air-fuel comparison target air-fuel ratio or threshold air-fuel ratio (such as, with the difference of stoichiometric proportion) more accurate △ Ip can be determined, and ethanol (or humidity) estimation can be carried out more reliably.
Fig. 3-5 illustrates the flow chart of the program of the engine system illustrated for comprising exhaust sensor (such as with reference to the exhaust sensor 200 described shown in figure 2).Particularly, Fig. 3 illustrates the program for knowing air-fuel ratio correction factor.Fig. 4 illustrates amount and ambient humidity for utilizing exhaust sensor accurately to estimate the alcohol in fuel, simultaneously according to the program that the air-fuel ratio correction factor known in figure 3 is revised the impact that air-fuel ratio changes.Such as, at the first motor under fuel condition, apply the first voltage, make it possible to export from this exhaust sensor know air-fuel ratio correction factor.Under first supplies fuel condition for the second motor after fuel condition, the first and second voltages sequentially applied to this sensor and revises the output of this sensor, making it possible to according to this sensor determination fuel alcohol content.Finally, under trimotor does not supply fuel condition, alternately apply the first and second voltages and revise this sensor to export, make it possible to according to this sensor determination ambient humidity.Fig. 5 illustrates the program controlling motor for the amount according to the ambient humidity estimated and the amount from the fuel alcohol content of this exhaust sensor.By determining air-fuel ratio correction factor (such as, the error of air-fuel ratio sensor) and it is put on exhaust sensor output, ambient humidity and fuel alcohol content can be estimated more accurately, make it possible to control engine system more accurately.
Continue the flow chart that Fig. 3, Fig. 3 illustrate the program 300 illustrated for knowing air-fuel ratio correction factor.Particularly, program 300 knows the error between the air-fuel ratio of expection and the air-fuel ratio of reality under motor supplies fuel condition.Such as, the air-fuel ratio of expection is determined according to Operational Limits, and the air-fuel ratio of reality is determined according to exhaust sensor (such as going up the Universal Exhaust Gas lambda sensor 200 described by described reference drawing 2).
At 310 places, determine engine operating condition.Such as, engine operating condition can include but not limited to air-fuel ratio, enters the amount of the EGR of firing chamber and supply fuel condition.
Once determine operating mode, program 300 proceeds to 312, and at 312 places, the air-fuel ratio of this expection calculates in an open-loop manner.Such as, the air-fuel ratio of this expection can calculate according to the Operational Limits of such as fuel injection and air mass flow.
At 314 places, judge whether motor is supplying under fuel condition.Such as, if fuel area density at least cylinder of motor can determine that motor is under fuel condition.If determine that motor is not supplying under fuel condition (such as, motor is not supplying under fuel condition), then EOP end of program.
On the other hand, if determine that motor is supplying under fuel condition, this program proceeds to 316 and the first pumping voltage (V
1) put on the oxygen pumping chamber of exhaust sensor.The applying of the first voltage produces the output of this sensor with the form of the first pumping current, this first pumping current represents the amount of the oxygen in this sample gas.In this example, be injected into motor and burn due to fuel, this first pumping current can represent the amount of the oxygen in exhaust.Therefore, at 318 places, export (such as, in response to applying first pumping voltage) according to this sensor and determine actual air-fuel ratio.
Once determine actual air-fuel ratio, at 320 places, determine this correction factor according to the difference between the air-fuel ratio (determining at 312 places) of this expection and the air-fuel ratio (determining at 318 places) of reality.
By this way, air-fuel ratio correction factor can be determined.Therefore, described in detail by with reference to figure 4, accurately can determine the estimation being vented water content and fuel alcohol content, and not require air-fuel ratio accurately to control to desired value.
Proceed to Fig. 4, Fig. 4 illustrates the flow chart of the estimation routine 400 illustrated for exhaust sensor (such as shown in fig. 2 UEGO sensor 200).Particularly, during supplying fuel condition at the motor selected, to the voltage that the pumping chamber of this sensor applies, and according to as above with reference to the air-fuel ratio correction factor of the calculating described by figure 3, program 400 determines the amount of the alcohol be ejected in the fuel in motor, and therefore determines fuel type.
At 410 places of program 400, determine engine operating condition.Such as, engine operating condition can include but not limited to air-fuel ratio, enters the amount of the EGR of firing chamber and supply fuel condition.
Once determine engine operating condition, program 400 proceeds to 412, at 412 places, determines whether motor is not supplying under fuel condition.Do not comprise vehicle deceleration condition for fuel condition and fuel supply is interrupted but motor continues to rotate and the engine operating condition that running of at least one intake valve and an exhaust valve; Therefore, air flows through one or more cylinder, but fuel is not injected into cylinder.Do not supplying under fuel condition, do not carrying out burning and ambient air can move to venting gas appliance by cylinder from air inlet system.By this way, sensor, such as UEGO sensor, can reception environment air, can perform on a sensor the measurement that such as ambient humidity detects.
As indicated, can not comprise for fuel condition, such as, deceleration fuel cutoff (DFSO).DFSO in response to operator's pedal (such as, respond driver not oil supply and wherein vehicle acceleration be greater than threshold quantity).Can repeatedly there is DFSO condition during driving cycle, and therefore at whole driving cycle, such as, during each DFSO event, many instructions of ambient humidity can be produced.Therefore, fuel type accurately can be determined according to the amount of water in exhaust, although between driving cycle or the even fluctuation of humidity during identical driving cycle.
Continue with reference to figure 4, if determine that motor is not supplying under fuel condition, such as, DFSO, program 400 proceeds to 414, at 414 places, applies the first pumping voltage (V to the oxygen pumping chamber of exhaust sensor
1) and receive the first pumping current (I
p1).This first pumping voltage can have value, makes oxygen from this room pumping, but enough low, makes such as H
2the compound of the oxygen of O (such as, water) is not decomposed (such as, V
1=450mV).The applying of the first voltage is with the first pumping current (I
p1) form produce the output of this sensor, this first pumping current represents the amount of the oxygen in sample gas.In this example, because motor is not supplying under fuel condition, the amount of oxygen can correspond to the amount of the oxygen in the fresh air of vehicle periphery.
Once the amount of oxygen is determined, program 400 proceeds to 416, at 416 places, applies the second pumping voltage (V to the oxygen pumping chamber of exhaust sensor
2) and receive the second pumping current (I
p2).This second voltage can be greater than the first voltage being applied to sensor.Particularly, this second voltage can have sufficiently high value to decompose the oxygen compounds of wishing.Such as, this second voltage can be enough high, with by H
2o molecular breakdown Cheng Qing and oxygen (such as, V
2=1.1V).The applying of the second voltage produces the second pumping current (I
p2), this second pumping current represents the amount of oxygen in sample gas and water." water " that should be appreciated that in terminology used here " amount of oxygen and water " refers to the H from the decomposition in sample gas
2the amount of the oxygen of O molecule.
At 417 places, the first pumping current and the second pumping current utilize the air-fuel ratio correction factor correction known.Such as, the air-fuel ratio correction factor known can as above determined with reference to 320 places of the program 300 described by figure 3.
Ambient humidity (such as, the absolute humidity of the fresh air of vehicle periphery) can be determined according to the first pumping current, the second pumping current and air-fuel ratio correction factor 418 places in program 400.Such as, the first pumping current can be subtracted to obtain the value represented from the amount of the oxygen of the water molecule (such as, the amount of water) of the decomposition in this sample gas from the second pumping current.This value can be proportional with ambient humidity.Then this ambient humidity value can according to the correction of air-fuel ratio correction factor.
On the other hand, if determine that motor is not supplying under fuel condition, the program 400 of Fig. 4 moves to 420, at 420 places, determine feedback air according to this sensor-fuel ratio control or the alcohol that undertaken by this sensor whether detect be wish or have pending.Whether this selection based on operating mode, such as, from a period of time that last time, alcohol was determined, or can realize closed-circuit air-fuel ratio control.Such as, if feedback air-fuel ratio can not be realized to be controlled, this program can continue to determine alcohol content, if instead feedback air-fuel ratio controls to be ordered maybe can realize, this program can proceed this feedback air-fuel ratio and control (and uncertain alcohol content).
In addition, in alternative embodiment, even when feedback air-fuel ratio controls have pending, first lambda sensor (such as, one UEGO sensor) may be used for feedback control, and the second lambda sensor (such as, the 2nd UEGO sensor) may be used for determining fuel alcohol content.Such as, if motor has two cylinder group, each have exhaust UEGO sensor, at least indicate the supposition of the air-fuel ratio of two groups at sensor under, air-fuel ratio that UEGO sensor can be used for controlling often to organize (even if this sensor without undergoing from the wherein exhaust of a group), and UEGO of another group is run to determine fuel alcohol content.Alternately, a UEGO sensor can the upstream of the 2nd UEGO sensor in identical exhaust stream.Again, engine air-fuel ratio can control by spraying according to this upstream UEGO fuel metering, and this downstream UEGO can be used for measuring fuel alcohol content.Therefore, in one example in which, a kind of method of the motor for having the first and second UEGO sensors can be provided, wherein during the motor selected supplies fuel condition, applying first and second voltage (and fuel alcohol content is determined according to the output of this sensor caused by this first and second voltage) is replaced to a UEGO sensor, and the fuel meanwhile, be adjusted in motor sprays to keep the air-fuel ratio of wishing according to the feedback from the 2nd UEGO sensor.So this operation can be changed between the first and second UEGO sensors so that suitable the determining whether monitoring fuel alcohol content reaches, and therefore monitor first and/or the 2nd performance of UEGO sensor determination fuel alcohol content.
Turn back to Fig. 4, if determine that feedback control is wished, then program 400 moves to 436 and sensor is operating as oxygen (such as, O
2) sensor, to determine the oxygen concentration that is vented and/or air-fuel ratio and this EOP end of program.
If it is wish that alcohol detects, then program 400 proceeds to 422, at 422 places, determines whether exhaust gas recirculatioon (EGR) valve is opened.If determine that EGR valve is opened, program 400 moves to 424, and at 424 places, EGR valve is closed.Once be close or determine that EGR valve is closed at 422 places in 422 place's EGR valve, and the amount therefore entering the EGR in firing chamber is zero substantially, then program 400 proceeds to 426, at 426 places, applies the first pumping voltage (V to exhaust sensor
1) and receive the first pumping current (I
p1).As at 414 places, this first pumping voltage from oxygen pumping chamber pumping oxygen, but can have enough low value (such as, V
1=450mV), therefore do not decompose water molecule (such as, the H in this pumping chamber
2o).In some instances, the first pumping voltage applied sensor at 426 places can be identical with the first pumping voltage applied sensor at 414 places.When the first voltage puts on pumping chamber, produce the first pumping current (I
p1).In this example, being injected in motor due to fuel and burning, therefore the first pumping current can represent the amount of the oxygen in exhaust.
At 428 places of program 400, the second pumping voltage (V
2) put on the pumping chamber of exhaust sensor and the second pumping current (I
p2) received.As above, this second pumping voltage can higher than the first pumping voltage, and the second voltage can be enough high with the oxygen compounds decomposing such as water molecule.Apply the second pumping voltage at oxygen pumping chamber two ends and produce the second pumping current (I
p2).This second pumping current can represent the amount oxygen of the water molecule of selfdecomposition (when the oxygen sovolin such as, Already in sample gas applies the second pumping voltage) of oxygen in sample gas and water.
At 430 places, the first pumping current and the second pumping current utilize the air-fuel ratio correction factor correction known.Such as, this air-fuel ratio correction factor known can as above determined with reference to 320 places of the program 300 described by figure 3.
Once produce the first and second pumping current, the amount of the water in sample gas can be determined at 432 places of the program 400 of Fig. 4.Such as, the first pumping current can deduct from the second pumping current, and then revises according to this air-fuel ratio correction factor the value determining the amount corresponding to water.
Finally, the amount of the alcohol in fuel and therefore fuel type can determine at 434 places.Such as, the amount of the water in exhaust can be proportional with the amount of the alcohol in the fuel be injected in motor (such as, the percentage of ethanol).Because ambient humidity also can contribute to the amount of the water in exhaust, the ambient humidity therefore determined at 418 places can deduct from the amount of the water determined 430.In certain embodiments, the computer-readable recording medium receiving the control system of the communication of sensor can comprise the instruction of the amount for determining alcohol.Such as, plotted curve 600 in Fig. 6 burning is shown after water (such as, the percentage of the water in exhaust) and fuel in ethanol percentage between the example of relation, this relation can such as be stored in this computer-readable recording medium in the form of a lookup table.The block curve 606 of plotted curve 600 illustrates the percentage of the water in the exhaust when existence zero ambient humidity.The percentage of water when this dashed curve 604 and broken/dotted line curve 602 illustrate the water that to there is 0.5 % by mole and 3.5 % by mole due to ambient humidity respectively in exhaust.As shown by plotted curve 600, when the amount of the ethanol in fuel increases, the amount of the water in exhaust increases.
Therefore, according in response at motor for fuel and the sensor output that do not produce for the voltage sequentially putting on the oxygen pumping chamber of exhaust sensor during fuel condition (such as, pumping current) and air-fuel ratio correction factor, the amount of the water in being vented can be determined.By this way, the accurate instruction of the amount (such as, percentage of ethanol) of the alcohol in fuel can be determined.And, as follows by what describe in detail, once fuel type is determined, various engine operating parameter can be regulated, to keep motor and/or discharge efficiency.
With reference now to Fig. 5, Fig. 5, the flow chart for regulating total control program 500 of engine operating parameter according to the amount of the alcohol in the fuel be ejected in motor is shown.Particularly, the change corresponding to the amount of alcohol in fuel can regulate one or more engine operating parameter.Such as, the fuel comprising the amount of different alcohol can have different character, such as, and viscosity, octane value, potential enthalpy of vaporization etc.Therefore, if do not regulate one or more suitable Operational Limits, engine performance, fuel economy and/or discharge possible deviation.
At 510 places of program 500, determine engine operating condition.Engine operating condition can comprise, such as, and air-fuel ratio, fuel injection timing and spark timing.Such as, the type of change is that the air of stoichiometric proportion can change (such as, being 14.7 for gasoline, is 9.76 for E85) with the ratio of fuel and based on fuel type can need fuel metering injection timing and spark timing.
Once determine operating mode, determine amount and the ambient humidity of the alcohol in the fuel mixture upgraded at 512 places of program 500.As described above, fuel type can be determined according to the output from the such as exhaust sensor of UEGO sensor.After knowing fuel type, program 500 proceeds to 514, and at 514 places, under the operating mode selected, such as cold start-up or instantaneous for fuel condition, the amount of the alcohol in based on fuel regulates the Operational Limits of one or more hope.Such as, the amount of the alcohol in based on fuel, this system can regulate stoichiometric air-fuel ratio.And, the amount of alcohol in based on fuel can regulate feedback air-fuel ratio ride gain.Further, the amount of alcohol in based on fuel the air-fuel ratio of the hope during cold start-up can be regulated.Further, the amount of the alcohol in based on fuel can regulate spark angle (such as spark lag) and/or boost level.
In certain embodiments, such as, the timing that the fuel in one or more cylinder can be regulated to spray and/or amount.Such as, if determine that the amount of alcohol in fuel during cold start increases (such as from 10% ethanol to 30% ethanol), the amount of the fuel being injected into motor can be increased.
As another example, the amount according to the alcohol in detected fuel can regulate spark timing.Such as, if the alcohol percentage detected is lower than the alcohol percentage (such as, from 85% ethanol to 50% ethanol) previously detected, can spark timing be postponed to realize higher motor output or boosting, and there is no pinking.
Therefore, various engine operating parameter can be regulated according to the amount of the alcohol in the fuel detected be ejected in engine cylinder during the operating mode selected.By this way, motor and/or discharge efficiency and fuel economy can be kept or improve.
Fig. 8 illustrates the plotted curve 800 described the pumping current signal that air-fuel ratio impact is revised.Curve 802 illustrates in response to the first voltage (V
1) the uncorrected pumping current of applying first, and curve 804 illustrates in response to the second voltage (V
2) the uncorrected pumping current of applying second.Dashed curve 806 illustrates the first pumping current according to the correction of air-fuel ratio correction factor.Dashed curve 808 illustrates the second pumping current according to the correction of air-fuel ratio correction factor.As shown in the plot 800, pumping current can be regulated by air-fuel ratio correction factor, makes pumping current have accurate value, even if air-fuel ratio is different from the value of expection.
By this way, exhaust water content can be improved estimate and the precision determined of fuel alcohol content and a large amount of air-fuel ratio control during not requiring to estimate.By determining the exhaust air-fuel ratio of the existence when being vented water content and estimating, and according to exhaust air-fuel ratio and target or difference between the air-fuel ratio of demarcating, correction exhaust gas oxygen sensor exports, and rare or dense exhaust can be caused the impact of sensor measurement.Therefore, before lambda sensor runs or run duration, this reduces accurately controlling the needs of air-fuel ratio to desired value, and allows to carry out water estimation and do not require the fuel adaptation that needed.By utilizing same exhaust sensor to measure actual air-fuel ratio and humidity and alcohol content, parts can be realized and reduce benefit.
It should be pointed out that the exemplary control comprised can use with estimation routine together with various motor and/or Vehicular system structure here.It is one or more that concrete program described herein can represent in any number processing policy, such as event driven, drives interrupts, Multi task, multithreading etc.Therefore, shown various actions, operation or function can be carried out with shown order, carry out simultaneously or omissiblely in some cases to carry out.Equally, in order to realize the feature and advantage of the exemplary embodiments described here, the order of process does not necessarily require, but in order to easily illustrate and describe and provide.Action shown in one or more or function depend on that specific policy used can repeatedly carry out.And described action diagrammatically shownly can be incorporated into the code in the computer-readable recording medium in engine control system.
It should be understood that structure disclosed herein and program are exemplary in itself, and these specific embodiments are not considered to restrictive, because many changes are possible.Such as, above-mentioned technology can be applied to V-6, I-4, I-6, V-12, opposed 4 cylinders and other engine types.Theme of the present disclosure comprise all novelties of various system disclosed herein and structure and other features, function and/or character with non-obvious combination and sub-portfolio.
Claim is below specifically noted and is thought novel in more non-obvious combination and sub-portfolios.These claims may relate to " one " key element or " first " key element or its equivalent.These claims should be understood to the combination comprising one or more this key element, both two or more this key elements neither requiring nor excluding.Other combinations of disclosed feature, function, key element and/or character or sub-portfolio can by revising this claim or coming claimed in the application and related application by the submission of new claim.
These claims, than former claim be wider, narrower, equal in scope or difference is all contemplated as falling with in theme of the present disclosure.
Claims (20)
1. a method, it comprises,
At the first motor for during fuel condition,
First voltage is applied to exhaust sensor; And
Export according to sensor and know air-fuel ratio correction factor; And
During described first supplies fuel condition for the second motor after fuel condition,
Described sensor is being applied to the first voltage and applying to replace between the second voltage; And
The correction factor exported according to the sensor at described first and second voltage places and know estimates the fuel alcohol content sprayed.
2. method according to claim 1, wherein know that described correction factor comprises and know described correction factor according to the difference between the air-fuel ratio of expecting and the air-fuel ratio of reality, the air-fuel ratio of described reality exports based on described sensor.
3. method according to claim 2, wherein said first voltage is less than described second voltage, and described second voltage decomposition water molecule, and described first voltage does not decompose water molecule.
4. method according to claim 3, the sensor wherein at described first and second voltage places exports and comprises in response to applying the first pumping current that described first voltage produces and the second pumping current produced in response to described second voltage of applying.
5. method according to claim 4, wherein said first pumping current represents the amount of oxygen and described second pumping current represents the amount of oxygen and water.
6. method according to claim 5, the amount of wherein said water is proportional with the amount being injected into the alcohol in the fuel of described motor, and the amount of described alcohol is the percentage of ethanol.
7. method according to claim 1, also comprise: during the trimotor after described first condition does not supply fuel condition, described sensor is being applied to described first voltage and to apply between described second voltage alternately, and to export according to the described sensor at described first and second voltage places and the correction factor known produces the instruction of ambient humidity.
8. method according to claim 7, wherein said trimotor does not comprise deceleration fuel cutoff for fuel condition, and at least one intake valve of wherein said motor and an exhaust valve are opened.
9. method according to claim 1, wherein said exhaust sensor is Universal Exhaust Gas lambda sensor.
10., for a method for motor, it comprises:
At the motor run duration for fuel, the first lower voltage is applied, to know the error between the air-fuel ratio of expection and the air-fuel ratio of reality to exhaust sensor;
After knowing described error,
For the motor run duration of fuel, each in described first voltage and the second higher voltage is sequentially applied to described sensor;
Export according to the sensor of the error correction known at described first and second voltage places; And
According to the ethanol content of the fuel that the sensor output estimation of described correction burns.
11. methods according to claim 10, wherein revise sensor and export the first pumping current comprising and being exported by described sensor in the applying correction of described first voltage with the error responses known, and with the second pumping current that the error responses known are exported in the applying correction of described second voltage by described sensor.
12. methods according to claim 11, wherein estimate that ethanol content comprises the water content estimating the fuel of conveying according to the difference between the first pumping current of described correction and the second pumping current of described correction, and know the described ethanol content of described fuel according to the water content of described estimation by inference.
13. methods according to claim 12, also comprise, and are not supplying the motor run duration of fuel, are sequentially applying each in described first and second voltages to described exhaust sensor; Export according to the sensor of the described error correction known at described first and second voltage places; And according to the sensor output estimation ambient humidity of described correction.
14. methods according to claim 13, also comprise, according to the one or more adjustment EGR flow in the ambient humidity of described estimation and the fuel alcohol content of described estimation.
15. methods according to claim 10, wherein apply described first voltage to know that error comprises based on fuel and to spray and air mass flow open loop calculates the air-fuel ratio of described expection, according to the air-fuel ratio measuring described reality when the output of described sensor applying described first voltage, and know error according to the difference between the air fuel ratio of described expection and the air-fuel ratio of described reality.
16. methods according to claim 15, the described output of the described sensor wherein when applying described first voltage is sensor pumping current.
17. 1 kinds for controlling the system of the motor in fuel flexible vehicle, described system comprises:
Comprise the gas exhaust manifold of exhaust gas oxygen sensor; With
Comprise the controller of computer-readable recording medium, described computer-readable recording medium comprises instruction, its for:
At the motor selected for during fuel condition,
Apply the first lower voltage to described sensor and receive the first pumping current exported from described sensor, described first pumping current represents the amount of oxygen;
According to described first pumping current estimated exhaust air-fuel ratio;
Exhaust air-fuel ratio according to the described estimation of the air-fuel ratio relative to expection knows correction factor;
Described know after,
Apply the second higher voltage to described sensor and receive the second pumping current exported from described sensor, described second pumping current represents the amount of oxygen and water; And the amount of the ethanol in the fuel burnt in described motor is determined according to described first and second pumping current and described correction factor.
18. systems according to claim 17, each determining to comprise in described first and second pumping current described correction factor being applied to and being exported by described sensor wherein said, and the amount calculating described ethanol according to the difference between the first and second pumping current of described correction.
19. systems according to claim 18, wherein said controller also comprises the instruction of the amount of the described ethanol in the fuel burnt in described motor for environmentally humidity correction, described ambient humidity according at motor not for the output of described sensor when applying described first voltage during fuel condition.
20. systems according to claim 19, wherein said controller also comprises instruction, its for, regulate engine operating parameter according to the amount of the described ethanol in described fuel and described ambient humidity, it is one or more that described engine operating parameter comprises in EGR flow, spark timing and fuel injection amount.
Applications Claiming Priority (2)
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|---|---|---|---|
| US13/972,747 | 2013-08-21 | ||
| US13/972,747 US8763594B2 (en) | 2009-12-04 | 2013-08-21 | Humidity and fuel alcohol content estimation |
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| CN106593663B (en) * | 2015-10-20 | 2021-04-06 | 福特环球技术公司 | Method and system for determining knock control fluid composition |
| CN106979056A (en) * | 2016-01-15 | 2017-07-25 | 福特环球技术公司 | Method and system for estimating environmental pressure using lambda sensor |
| CN107061025A (en) * | 2016-01-25 | 2017-08-18 | 福特环球技术公司 | The method and system of air-fuel ratio is estimated using variable voltage lambda sensor |
| CN109073591A (en) * | 2016-05-02 | 2018-12-21 | 大陆汽车有限公司 | Method for operating probe |
| CN109073591B (en) * | 2016-05-02 | 2021-01-05 | 大陆汽车有限公司 | Method for operating a probe |
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