WO2011082884A1 - Vorrichtung zur messung einer zusammensetzung eines kraftstoffgemischs - Google Patents
Vorrichtung zur messung einer zusammensetzung eines kraftstoffgemischs Download PDFInfo
- Publication number
- WO2011082884A1 WO2011082884A1 PCT/EP2010/068248 EP2010068248W WO2011082884A1 WO 2011082884 A1 WO2011082884 A1 WO 2011082884A1 EP 2010068248 W EP2010068248 W EP 2010068248W WO 2011082884 A1 WO2011082884 A1 WO 2011082884A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fuel
- fuel mixture
- time
- voltage
- ethanol content
- Prior art date
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 101
- 239000000203 mixture Substances 0.000 title claims abstract description 57
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 66
- 238000000034 method Methods 0.000 claims abstract description 23
- 230000036962 time dependent Effects 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 230000001419 dependent effect Effects 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 33
- 230000008859 change Effects 0.000 claims description 19
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 11
- 238000002485 combustion reaction Methods 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000005684 electric field Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2835—Specific substances contained in the oils or fuels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2835—Specific substances contained in the oils or fuels
- G01N33/2847—Water in oils
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/26—Oils; Viscous liquids; Paints; Inks
- G01N33/28—Oils, i.e. hydrocarbon liquids
- G01N33/2835—Specific substances contained in the oils or fuels
- G01N33/2852—Alcohol in fuels
Definitions
- the invention is based on known methods and devices for the determination of compositions of fuel mixtures.
- fuel mixtures which in addition to the actual mineral oil fuels can process an admixture of ethanol and / or other alcohols.
- flex-fuel vehicles are known which can be operated with variable ethanol / gasoline mixtures.
- the parameters of the engine control of the fuel are adapted to the composition of the fuel mixture in each case. It is possible to identify differently used concepts worldwide. While in the US so far only necessary adjustments of the engine control are made to the fuel mixture in order to be able to offer flex fuel vehicles at all, efficiency and performance increases are typically also sought in Europe. In particular, the latter, however, usually requires an accurate knowledge of the composition of the fuel mixture, in particular of an ethanol fuel, in order to determine optimum parameters of the engine control.
- the determination of the ethanol-fuel mixture ratio is usually either on the basis of existing measured variables by means of software in the control unit itself or this mixing ratio can be detected with an ethanol sensor.
- Such ethanol sensors can be based on numerous different measurement principles.
- capacitance measuring methods based on permittivity and conductivity determination are used here.
- permittivity of the fuel mixture is determined.
- a device is used for measuring the alcohol content in a fuel mixture which can be used in a fuel line.
- the fuel line is made of a material which is permeable to high-frequency signals.
- a microwave chamber is disposed outside of the fuel line, thereby enclosing a portion of this fuel line.
- the microwave chamber has a pair of waveguides disposed opposite to each other with the fuel line therebetween.
- One of the waveguides is provided with an antenna section for transmitting microwaves from a microwave generator.
- the other microwave conductor is provided with a receiving antenna section to receive the microwaves passing through the fuel line.
- Microwaves received by the antenna section are detected by a detector and converted into DC signals corresponding to the strength of the received microwaves.
- the ignition angle is adjusted depending on the detected ethanol content by the engine control variables, such as the fuel metering.
- a differential sensor concept is proposed, the basic structure of which is characterized essentially by the fact that within the fuel line from the tank to the injection valves there are two spatially separate sensor elements, which are sequentially flowed through by fuel in time. Both sensor elements generate a time-dependent output signal which has a clear dependence on the ethanol content.
- a signal processing which takes place for example within the engine control unit of the internal combustion engine, the difference of the two output signals is determined and the difference signal is evaluated in a plausibility check. Within the plausibility check, the time course of the difference signal is evaluated by determining the flow rate of the fuel and thus checking whether characteristic features of the difference signal are plausible for this flow rate.
- the determination of the flow rate is made in the engine control unit by modeling the fuel system as a simple memory model with known discharge, which essentially corresponds to the product of engine speed and injection quantity per injection.
- the output signal contains at least the information about the change Direction of the ethanol content of the fuel mixture and optionally the amount of change.
- the knowledge of the absolute ethanol content but information about the change in the ethanol content of the fuel mixture prior to the combustion of the fuel is utilized for the engine control within a flex-fuel system. If this change and the direction of the change detected by a sensor, the subsequent mixture deviation is immediately and uniquely attributable to the changed ethanol content of the fuel mixture. Furthermore, an optimal ignition angle can be determined by the knock control, which then in both
- Steep engagement directions i. Early and late adjustment, can engage in the ignition angle.
- a suitable construction of the sensor elements for a measurement of the permittivity of the fuel comprises, for example, two metallic electrodes which are integrated into the fuel line and which are in the form of cylindrical pipe sections.
- further mutually insulated metallic electrodes may be provided in the form of a tube of larger diameter.
- the electrodes form a capacitor comprising two concentric cylinders whose dielectric is formed by the fuel.
- the electrical connection of the evaluation which is arranged for example in the engine control unit, via different ports.
- a signal evaluation of the difference signal in the context of the plausibility check for example, by a circuit arrangement with two capacitors and two resistors, which are fed via an AC voltage, take place.
- the difference between the voltages across the capacitors is determined by an operational amplifier and is available as voltage U_diff.
- This circuit arrangement designed, for example, as a bridge circuit is state of the art, whereby U_diff with A D converter is available as a digital variable for further processing in the microcontroller.
- the AC voltage may be a sinusoidal voltage generated by the circuit briefly described above using an operational amplifier. If the analog / digital conversion of U_diff is carried out at selected times, for example the zero crossings of the sinusoidal voltage, the amplitude and the phase shift of U_diff with respect to the AC voltage Vs1 can be determined in an algorithm with little effort become. These values typically change as the capacity temporarily changes in capacity as it flows through with a changing fuel composition.
- the properties of the microcontroller already present in the engine control unit are utilized.
- the AC voltage Vs1 is provided as a rectangular voltage available, for example, by known programming of a counter and output of the signal via a digital output boards of the microcontroller, this results in a time-dependent differential voltage per pulse of the square wave voltage Vs1, which again after analog / digital conversion can be further processed in an algorithm.
- FIG. 1 is a schematic representation of the differential sensor concept proposed according to the invention
- FIG. 2 shows the construction of sensor elements for a measurement of the permittivity of the fuel mixture
- FIG. 3.1 shows a circuit arrangement for signal evaluation
- FIG. 3.2 shows a schematic representation of a motor control unit with microcontroller
- Figure 4 shows the voltage curve for two time constants across the capacitors over time.
- FIG. 1 shows a schematic representation of a sensor concept proposed according to the invention.
- FIG. 1 shows a sensor 10, which comprises a first sensor element 14 and a second sensor element 16, which are spatially separated from one another and connected to the fuel line 12, in which fuel flows.
- the fuel flowing in the fuel line 12 is a fuel mixture which may contain ethanol, water and possibly other admixture components whose size is determined by the sensor proposed according to the invention.
- the fuel line 12 extends from the tank, not shown in Figure 1 to the injection valves of the internal combustion engine.
- the first sensor element 14 and the second sensor element 16 are spatially separated from each other and are sequentially flowed through by fuel in time.
- the two sensor elements 14, 16 each generate a time-dependent output signal, the first sensor element 14, a first output signal 18, the second sensor element 16, a second time-dependent output signal 20. Both time-dependent output signals 18, 20 have a clear dependence on the ethanol content of the fuel mixture.
- the first time-dependent output signal 18 and the second time-dependent output signal 20 are further processed within a signal processing, which can take place for example within an engine control unit.
- a difference-forming stage 22 the difference between the first time-dependent output signal 18 and the second time-dependent output signal 20 of the spatially separated sensor elements 14, 16 is determined.
- the signal obtained is evaluated within a plausibility stage 24 connected downstream of the difference-forming stage 22.
- the plausibility of the output signal of the difference-forming stage 22 is determined in such a way that a flow velocity 26 with which the fuel flows in the fuel line 12 is determined.
- the plausibility stage 24 is supplied, on the one hand, with the output signal, ie with the differential signal of the differential stage 22 and, on the other hand, with the determined flow rate 26.
- the determination the flow rate 26 takes place, for example, within the engine control unit by modeling the fuel system as a memory model, indicated by reference numeral 28. Input variables of the memory model, which assumes a known outflow, the engine speed 30 of the internal combustion engine and an injection amount per injection 32 of internal combustion engine.
- the flow rate 26 of the fuel in the fuel line 12 is determined from the product of the input engine speed 30 and the injection quantity per injection 32.
- the output signal 34 output at the plausibility check stage 24 contains at least the information about the direction of change of the ethanol content within the fuel mixture and optionally the amount of the change.
- the control of an engine of an internal combustion engine in flex-fuel operation requires only the information about the change in the ethanol content before combustion of the fuel and only optional knowledge of the absolute presence of ethanol content of the fuel mixture. If the change in the ethanol content and the direction of the change is determined by the sensor proposed according to the invention, a subsequent mixture deviation is immediately and unambiguously attributable to the changed ethanol content. Depending on the change in the mixture deviation, an optimal firing angle within the engine control can be determined by knock control, which is then controlled in both steep engagement directions, i. Early and late adjustment, with respect to the ignition angle can intervene.
- FIG. 2 shows an embodiment possibility of the sensor elements of the sensor proposed according to the invention.
- a permittivity of the fuel follows.
- a permittivity number in particular a complex permittivity number
- an absorption in particular a complex absorption
- a transmission in particular a complex transmission
- one of the complex variables mentioned above is a variable which includes an amplitude and a phase.
- the permittivity which is often referred to by the letter ⁇ , describes the permeability of materials for electric fields. It is a material property of dielectrics and at least only weakly electrically conductive materials, which manifests itself in the application of electrical fields to their materials.
- D ⁇ ⁇ E.
- the permittivity number ⁇ ⁇ thus characterizes the field weakening effects of the electrical polarization within electrically insulating materials.
- the electrical susceptibility ⁇ ⁇ - 1.
- susceptibility and the permittivity number are not conceptually distinguished below.
- both the permittivity and the susceptibility of the fuel can be measured.
- the fuel line 12 which is traversed by fuel, there are two mutually insulated metallic electrodes 38 and 40.
- a first metallic electrode is denoted by reference numeral 38
- a further second metallic electrode has been identified by reference numeral 40.
- the two metallic electrodes 38 and 40 are in the form of cylindrical tube pieces.
- the two metallic electrodes 38 and 40 are enclosed by a further third metallic electrode 42, which is in the form of a tube 44 and is insulated from the first metallic electrode 38 and the second metallic electrode 40.
- the illustration according to FIG. 2 shows that a diameter 46 of the third metallic electrode 42 designed as a tube 44 is greater than the respective diameter of the cylindrical tube pieces of the first metallic electrode 38 and the second metallic electrode 40.
- the dielectric of the first capacitor 48 or 58 and of the second capacitor 60 respectively forms the fuel flowing in the fuel line 12.
- FIG. 3.1 shows a circuit arrangement with which the time-dependent output signals obtained by the capacitors according to FIG. 2, which are dependent on the ethanol content of the fuel mixture, can be evaluated.
- FIG. 3.1 shows a circuit arrangement 56 which comprises the first capacitor 48 or 58 and the second capacitor 60.
- the first capacitor 48, 58 and the second capacitor 60 are, as described above in connection with Figure 2, constructed.
- the circuit arrangement 56 according to the illustration in FIG. 3.1 comprises a first resistor 62 (Ri) and a further second resistor 64 (R 2 ). Via the two resistors 62 and 64, respectively, the first capacitor 48, 58 and the second capacitor 60 are supplied with an AC voltage Vs1, an AC voltage source 66.
- the difference between the voltages across the first capacitor 48, 58 and the second capacitor 60 is determined by means of an operational amplifier 68 and is available as a voltage difference U_diff (see reference numeral 70).
- the circuit arrangement 56 shown in FIG. 3.1 corresponds to a bridge circuit.
- the voltage difference 70 is provided with an A / D converter 73 shown in FIG. 3.2 as a digital variable for further processing in a microcontroller 72, which are accommodated in an engine control unit 74.
- the microcontroller 72 which processes the input signals of the engine control, for example the engine speed, and determines the calculated output signals, eg the duration of the fuel injection, outputs the output signals to actuators, not shown here, of the engine control.
- the circuit arrangement 56 as shown in FIG.
- the AC voltage source 66 has an AC voltage in the form of a sinusoidal voltage as well as a square-wave voltage. capable of providing stimulation.
- a sinusoidal alternating voltage Vs1 can be generated using an operational amplifier (not shown here).
- the operational amplifier 68 performs the difference formation. If an analog / digital conversion of the voltage difference U_diff (see reference numeral 70) is carried out at selected times, for example at the zero crossings, the AC voltage Vs1 (66), the amplitude and the phase shift of the differential voltage U_diff, 70 in Reference to the AC voltage Vs1, 66 can be determined in an algorithm.
- the properties of a microcontroller 72 already present in the engine control unit 74 can be used, cf. Figure 3.2.
- the alternating voltage 66 is present as a rectangular voltage which takes place, for example, by programming a counter and outputting a signal via a digital output port of the microcontroller 72.
- the result is a time-dependent differential voltage per pulse of a square wave voltage Vs1, i. the alternating voltage present in the rectangle Vs1, 66. This in turn is to be further processed by an analog / digital conversion in an algorithm.
- FIG. 4 shows the course of two voltages for two time constants, wherein the two voltage profiles differ by a factor of three.
- FIG. 4 shows the course of a first voltage 76 (U1) for a first time constant R1.times.C1 and the course of a second voltage 78 (U2) for a second time constant R2.times.C2 (see reference numeral 82).
- the first voltage 76 differs from the second voltage 78 by a factor of 3 in the voltage slew rate.
- the curves of the first voltage 76 for the first time constant 80 and the curve of the second voltage 78 for the second time constant 82 according to the voltage curves in Figure 4 a.
- the first voltage 76 and the second voltage 78 are here supplied to a digital input of the microcontroller 72, which are each connected to a timer structure.
- Reference numeral 88 denotes a switching threshold, upon reaching the individual values for the first voltage 76 and the second voltage 78 at measured times t- ⁇ a first measured time 84 and t 2 , ie a second measured time, 86 generate. Since the difference between the measured times t-1 and t 2 is a measure of the ratio of the two values of the capacitances of the first capacitor 48, 58 and of the second capacitor 60. By a frequency of the supply voltage, ie the AC voltage 66, the comparatively high is In comparison to the change with time of the capacitances of the first capacitor 48, 58 and of the second capacitor 60 when the fuel composition changes, a large number of measurements are possible according to the method described above.
- first voltages 76 and second voltages 78 or first measured times t-1 and second measured times t 2 and second measured times t 2 are generated in the first capacitance 48, 58 and the second capacitance of the second capacitor 60 by fuel currents of constant permittivity ⁇ , which differ slightly from one another.
- the reasons for this are small asymmetries due to structure and cabling as well as a not exactly identical switching threshold 88 of the level detection of the digital inputs for the described method for time measurement.
- the signal evaluation is extended according to the illustration in Figure 3.1 by an offset compensation.
- the voltage difference 70 U_diff or the difference between the first measured time ti (84) and the second measured time t 2 (86) is filtered in a low-pass filter with a time constant of, for example, several minutes and this output signal from the signal for the voltage difference U_diff or the time difference between the first measured time ti (84) and the second measured time t 2 (86) is subtracted.
- Such offset compensation can be done by an analog circuit, but more advantageous is an algorithmic implementation in the microcontroller 72, which is integrated into the engine control unit 74 cf. Figure 3.2.
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medicinal Chemistry (AREA)
- Biochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Food Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/516,608 US9097696B2 (en) | 2009-12-17 | 2010-11-25 | Device for measuring a composition of a fuel mixture |
BRPI1014248A BRPI1014248B1 (pt) | 2009-12-17 | 2010-11-25 | dispositivo para medição de uma composição de uma mistura de combustível |
CN201080057041.4A CN102656453B (zh) | 2009-12-17 | 2010-11-25 | 用于测量燃料混合物组分的方法和装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009054844.0 | 2009-12-17 | ||
DE102009054844A DE102009054844A1 (de) | 2009-12-17 | 2009-12-17 | Vorrichtung zur Messung einer Zusammensetzung eines Kraftstoffgemischs |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011082884A1 true WO2011082884A1 (de) | 2011-07-14 |
Family
ID=43608381
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2010/068248 WO2011082884A1 (de) | 2009-12-17 | 2010-11-25 | Vorrichtung zur messung einer zusammensetzung eines kraftstoffgemischs |
Country Status (5)
Country | Link |
---|---|
US (1) | US9097696B2 (de) |
CN (1) | CN102656453B (de) |
BR (1) | BRPI1014248B1 (de) |
DE (1) | DE102009054844A1 (de) |
WO (1) | WO2011082884A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016137343A1 (en) | 2015-02-23 | 2016-09-01 | Alsemix Sp. Z O.O. | Method for determination of ethanol content in fuel for internal combustion engines |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20130047963A1 (en) * | 2011-08-26 | 2013-02-28 | Continental Automotive Systems Us, Inc. | Warranty violation detection system for disallowed fuels |
US9658204B2 (en) * | 2014-05-08 | 2017-05-23 | Continental Automotive Systems, Inc. | Stoichiometric air to fuel ratio sensor system |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3412704A1 (de) | 1983-04-06 | 1984-10-11 | Nippondenso Co., Ltd., Kariya, Aichi | Vorrichtung zum messen des alkoholgehaltes in kraftstoffgemischen |
EP0377782A2 (de) * | 1988-12-08 | 1990-07-18 | FEV Motorentechnik GmbH & Co. KG | Verfahren zur Feststellung des Alkoholgehaltes und/oder des Heizwertes von Kraftstoffen |
US5488311A (en) * | 1990-05-30 | 1996-01-30 | Japan Electronic Control Systems Co., Ltd. | Apparatus and method for measuring alcohol concentration of liquid blended with alcohol applicable to an automotive vehicle mounted internal combustion engine |
EP0819938A2 (de) * | 1996-07-17 | 1998-01-21 | ACHENBACH BUSCHHÜTTEN GmbH | Verfahren und Messsysteme zur Messung physikalischer Grössen von gering leitenden und nichtleitenden Fluiden |
DE102007039861A1 (de) | 2007-08-23 | 2009-02-26 | Robert Bosch Gmbh | Kraftstoffsatteltank und Verfahren zum Betrieb eines Kraftstofffördersystems in einem Kraftstoffsatteltank |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4945863A (en) * | 1988-03-30 | 1990-08-07 | Fev Motorentechnik Gmbh & Co. Kg | Process for operating a fuel-burning engine |
JP2519116B2 (ja) | 1990-05-30 | 1996-07-31 | 株式会社ユニシアジェックス | 静電容量式アルコ―ル濃度測定装置 |
WO2004114450A1 (ja) | 2003-06-24 | 2004-12-29 | Nec Corporation | アルコール濃度測定方法、アルコール濃度測定装置、および当該装置を含む燃料電池システム |
JP4821560B2 (ja) | 2006-10-27 | 2011-11-24 | 株式会社デンソー | 液体性状センサ |
DE102007026449A1 (de) | 2007-06-06 | 2008-12-11 | Robert Bosch Gmbh | Fluidsensorvorrichtung |
BRPI0701674B1 (pt) | 2007-07-13 | 2022-09-27 | Robert Bosch Limitada | Sistema e método de identificação de combustível |
JP4465725B2 (ja) | 2008-04-04 | 2010-05-19 | 株式会社デンソー | 液体用濃度測定装置 |
CN101435836B (zh) | 2008-12-17 | 2011-01-26 | 重庆大学 | 采用文氏桥振荡电路测量液体电导率的频率检测器 |
-
2009
- 2009-12-17 DE DE102009054844A patent/DE102009054844A1/de not_active Withdrawn
-
2010
- 2010-11-25 US US13/516,608 patent/US9097696B2/en not_active Expired - Fee Related
- 2010-11-25 CN CN201080057041.4A patent/CN102656453B/zh not_active Expired - Fee Related
- 2010-11-25 WO PCT/EP2010/068248 patent/WO2011082884A1/de active Application Filing
- 2010-11-25 BR BRPI1014248A patent/BRPI1014248B1/pt not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3412704A1 (de) | 1983-04-06 | 1984-10-11 | Nippondenso Co., Ltd., Kariya, Aichi | Vorrichtung zum messen des alkoholgehaltes in kraftstoffgemischen |
EP0377782A2 (de) * | 1988-12-08 | 1990-07-18 | FEV Motorentechnik GmbH & Co. KG | Verfahren zur Feststellung des Alkoholgehaltes und/oder des Heizwertes von Kraftstoffen |
US5488311A (en) * | 1990-05-30 | 1996-01-30 | Japan Electronic Control Systems Co., Ltd. | Apparatus and method for measuring alcohol concentration of liquid blended with alcohol applicable to an automotive vehicle mounted internal combustion engine |
EP0819938A2 (de) * | 1996-07-17 | 1998-01-21 | ACHENBACH BUSCHHÜTTEN GmbH | Verfahren und Messsysteme zur Messung physikalischer Grössen von gering leitenden und nichtleitenden Fluiden |
DE102007039861A1 (de) | 2007-08-23 | 2009-02-26 | Robert Bosch Gmbh | Kraftstoffsatteltank und Verfahren zum Betrieb eines Kraftstofffördersystems in einem Kraftstoffsatteltank |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016137343A1 (en) | 2015-02-23 | 2016-09-01 | Alsemix Sp. Z O.O. | Method for determination of ethanol content in fuel for internal combustion engines |
Also Published As
Publication number | Publication date |
---|---|
US20130133406A1 (en) | 2013-05-30 |
BRPI1014248B1 (pt) | 2019-08-13 |
CN102656453A (zh) | 2012-09-05 |
CN102656453B (zh) | 2016-08-03 |
US9097696B2 (en) | 2015-08-04 |
BRPI1014248A2 (pt) | 2016-04-12 |
DE102009054844A1 (de) | 2011-06-22 |
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