WO2006046457A1 - 液位検出方法及び液位検出装置 - Google Patents
液位検出方法及び液位検出装置 Download PDFInfo
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- WO2006046457A1 WO2006046457A1 PCT/JP2005/019278 JP2005019278W WO2006046457A1 WO 2006046457 A1 WO2006046457 A1 WO 2006046457A1 JP 2005019278 W JP2005019278 W JP 2005019278W WO 2006046457 A1 WO2006046457 A1 WO 2006046457A1
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- Prior art keywords
- liquid
- concentration
- temperature
- liquid level
- voltage value
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/24—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing the transmission of wave or particle radiation through the material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/26—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring pressure differences
Definitions
- Liquid level detection method and liquid level detection apparatus Liquid level detection method and liquid level detection apparatus
- the present invention relates to a liquid level detection method and apparatus, and in particular, when a liquid level is detected using a pressure sensor, the liquid level is detected with high accuracy by performing correction based on the density of the liquid.
- the present invention relates to a liquid level detection method and a liquid level detection apparatus that intend to do this.
- the liquid level detection method and the liquid level detection device of the present invention are used for exhaust gas for decomposing nitrogen oxides (NOx) in a system that purifies exhaust gas that also emits power, such as an internal combustion engine of an automobile. This can be used for detecting the level of the urea aqueous solution in the tank of the urea aqueous solution sprayed on the catalyst.
- NOx nitrogen oxides
- Fossil fuels such as gasoline and light oil are burned in an internal combustion engine of an automobile.
- water, carbon dioxide, etc. as well as unburned carbon monoxide (CO) and hydrocarbons (HC), sulfur oxide (SOx), nitrogen oxide (NOx), etc.
- CO carbon monoxide
- HC hydrocarbons
- SOx sulfur oxide
- NOx nitrogen oxide
- various measures have been taken to purify the exhaust gas from automobiles, particularly in order to protect the environment and prevent pollution of the living environment.
- One such measure is the use of an exhaust gas purification catalyst device.
- a three-way catalyst for exhaust gas purification is placed in the middle of the exhaust system, where CO, HC, NOx, etc. are decomposed by oxidation reduction to make them harmless.
- an aqueous urea solution is sprayed onto the force catalyst immediately upstream of the exhaust catalytic device.
- This urea aqueous solution needs to be in a specific urea concentration range in order to enhance the NOx decomposition effect, and the urea concentration of 32.5% is considered to be optimal.
- the urea aqueous solution is accommodated in a urea aqueous solution tank mounted on an automobile. Detecting the remaining amount of urine aqueous solution in the tank and displaying the remaining amount or issuing a warning when the amount falls below the set lower limit amount is due to the lack of urea aqueous solution in the tank. In order to prevent the deterioration of the catalyst function due to the supply of water solution to the exhaust gas purification catalyst being cut off, This is preferable.
- the level is detected.
- a pressure sensor is arranged near the bottom inside the tank, and this is detected.
- Some liquid levels are calculated based on the applied pressure.
- the density of the liquid is set to a predetermined value (for example, the density of a urea aqueous solution having a urea concentration of 32.5%).
- the concentration of the aqueous urea solution may change over time, and the urea concentration of the aqueous urea solution stored in the aqueous urea solution tank is not always constant. Therefore, it has been difficult to detect the liquid level of the urea aqueous solution in which the urea concentration changes with sufficiently high accuracy by the conventional method.
- NOx sensors are arranged on the upstream side and downstream side of the catalyst device, respectively, and whether or not the NOx decomposition is optimally performed based on the difference in the NOx concentration detected by these sensors. It has been made to determine.
- this method actually measures the effect of reducing NOx, before the spraying of the urea aqueous solution, the force at which the liquid is a urea aqueous solution having a predetermined urea concentration is also used at the beginning of spraying. It is not possible to identify whether or not.
- the NOx sensor used in such a method has a force that is not sensitive enough to realize the injection of urea aqueous solution within a predetermined urea concentration range.
- Patent Document 1 discloses that a heating element is heated by energization, the temperature sensing element is heated by this heating, and heat is transferred from the heating element to the temperature sensing element.
- a fluid identification method that determines the type of fluid to be identified based on the electrical output corresponding to the electrical resistance of the temperature sensing element, which is thermally affected by the fluid to be identified. The method to do is disclosed.
- Patent Document 1 Japanese Patent Laid-Open No. 11 153561 (particularly, paragraphs [0042] to [0049]) Disclosure of the Invention
- the present invention has been intended to detect a liquid level with high accuracy by performing correction based on the density of the liquid when detecting the liquid level using a pressure sensor.
- An object is to provide a liquid level detection method and a liquid level detection device.
- a liquid level detection method for detecting a liquid pressure applied to a pressure sensor by a pressure sensor arranged so as to come into contact with the liquid, and calculating a liquid level based on the liquid pressure and the density of the liquid,
- the liquid concentration is identified by applying a single pulse voltage to the heating element of the indirectly heated concentration detection unit including the heating element and the temperature sensing element. Then, the heat generating body is heated, and based on the output of a concentration detection circuit including a temperature sensing body of the indirectly heated concentration detection unit and a liquid temperature detection unit for measuring the temperature of the liquid. In one aspect of the present invention, when the concentration of the liquid is identified, the concentration of the liquid is determined by a concentration-corresponding voltage value corresponding to the difference between the initial temperature and the peak temperature of the temperature sensing element when the heating element generates heat. Perform the calculation.
- the voltage value corresponding to the initial temperature of the temperature sensing element is obtained by sampling the initial voltage before the start of the single pulse application to the heating element for a predetermined number of times and averaging.
- the peak temperature of the temperature sensor An average peak voltage value obtained by sampling and averaging the peak voltage before the end of the single pulse application to the heating element as a voltage value corresponding to the heating element, and using the average peak voltage value as the concentration corresponding voltage value The difference between the peak voltage value and the average initial voltage value is used.
- the liquid is an aqueous urea solution.
- a liquid level detection device that detects a liquid pressure applied to a pressure sensor by a pressure sensor arranged so as to come into contact with the liquid, and calculates a liquid level based on the liquid pressure and the density of the liquid,
- the concentration identification sensor unit includes an indirectly heated type concentration detecting unit including a heating element and a temperature sensitive body, and a liquid temperature detecting unit for measuring the temperature of the liquid, and the indirectly heated type concentration detecting unit and Each of the liquid temperature detection units includes a heat transfer member for the concentration detection unit and a heat transfer member for the liquid temperature detection unit for heat exchange with the liquid,
- a single pulse voltage is applied to the heating element of the indirectly heated concentration detection unit to cause the heating element to generate heat, and includes the temperature sensing element of the indirectly heated concentration detection unit and the liquid temperature detection unit.
- the calculation unit Based on the output of the concentration detection circuit, the calculation unit identifies the concentration of the liquid, and obtains the density value of the liquid based on the identified concentration of the liquid and the relationship between the concentration and density of the liquid,
- the calculation unit calculates a temporary liquid level value when the liquid is a liquid having a predetermined density based on the liquid pressure, and based on the temporary liquid level value and the density value, calculates the temporary liquid level value.
- a liquid level detecting device characterized by calculating a liquid level
- the calculation unit is configured to use the concentration-corresponding voltage value corresponding to the difference between the initial temperature and the peak temperature of the temperature sensing element when the heating element generates heat. Identify.
- the voltage value corresponding to the initial temperature of the temperature sensing element is obtained by sampling and averaging the initial voltage before the start of the single pulse application to the heating element a predetermined number of times. Obtained by sampling the peak voltage before the end of the application of the single pulse to the heating element as a voltage value corresponding to the peak temperature of the temperature sensing element and averaging it. The average peak voltage value is used, and the difference between the average peak voltage value and the average initial voltage value is used as the concentration-corresponding voltage value.
- a liquid temperature-corresponding output value corresponding to the liquid temperature of the liquid is input from the liquid temperature detection unit to the calculation unit, and the calculation unit receives a reference liquid having a plurality of known concentrations.
- the liquid temperature-corresponding output value obtained for the liquid to be identified and the concentration-corresponding voltage value are used. Identify.
- the liquid is an aqueous urea solution.
- a temporary liquid level value is calculated when the liquid is a liquid having a predetermined density based on the liquid pressure applied to the pressure sensor, and the concentration of the liquid is identified and identified. Since the density value of the liquid is obtained based on the concentration of the liquid and the relationship between the density and density of the liquid, and the liquid level is calculated based on the temporary liquid level value and the density value, It is possible to detect the liquid level with high accuracy while preventing the detection error due to the density of the liquid.
- FIG. 1 is an exploded perspective view showing an embodiment of a liquid level detection device according to the present invention.
- FIG. 2 is a partially omitted cross-sectional view of the liquid level detection device of FIG.
- FIG. 3 is a view showing a state where the liquid level detection device of FIG. 1 is attached to the tank.
- FIG. 4 is an enlarged view of the indirectly heated concentration detector and the liquid temperature detector.
- FIG. 5 is a cross-sectional view of the indirectly heated concentration detector in FIG.
- FIG. 6 is an exploded perspective view of a thin film chip of an indirectly heated concentration detector.
- FIG. 7 is a configuration diagram of a circuit for density discrimination.
- FIG. 8 is a diagram showing a relationship between a single pulse voltage P applied to a heating element and a sensor output Q.
- FIG. 9 is a diagram showing an example of a first calibration curve.
- FIG. 10 is a diagram showing an example of a second calibration curve.
- FIG. 11 is a diagram showing an example of a liquid temperature corresponding output value T.
- FIG. 12 is a flowchart showing a liquid level detection process.
- FIG. 13 is a graph showing the relationship between the hydraulic pressure of water and the liquid level.
- FIG. 14 is a diagram showing the relationship between urea concentration and density. Explanation of symbols
- FIG. 1 is an exploded perspective view showing an embodiment of a liquid level detection device according to the present invention used for carrying out the liquid level detection method according to the present invention
- FIG. 2 is a partially omitted sectional view thereof
- Figure 3 is a diagram showing the state of attachment to the tank. In this embodiment, an aqueous urea solution is assumed as the liquid.
- an opening 102 is provided in the upper part of a urea aqueous solution tank 100 for NOx decomposition that constitutes an exhaust gas purification system mounted on an automobile.
- a liquid level detection device 104 according to the present invention is attached to the opening.
- the tank 100 is provided with an inlet pipe 106 for injecting a urea aqueous solution and an outlet pipe 108 for taking out the urea aqueous solution.
- the outlet pipe 108 is connected to the tank at a height position close to the bottom of the tank 100, and is connected to a urea aqueous solution sprayer (not shown) via the urea aqueous solution supply pump 110.
- the urea aqueous solution sprayer disposed immediately before the exhaust gas purifying catalyst device sprays the urea aqueous solution onto the catalyst device.
- the liquid level detection device includes an identification sensor unit 2, a pressure sensor 3, and a support unit 4.
- An identification sensor unit 2 is attached to one end (lower end) of the support unit 4, and an attachment unit 4 a for attaching to the tank opening 102 is provided to the other end (upper end) of the support unit 4. It is provided.
- the identification sensor unit 2 includes an indirectly heated concentration detection unit 21 including a heating element and a temperature sensing body, and a liquid temperature detection unit 22 that measures the temperature of the liquid to be measured.
- the indirectly heated concentration detection unit 21 and the liquid temperature detection unit 22 are arranged at a certain distance in the vertical direction.
- Fig. 4 shows an enlarged view of the indirectly heated concentration detector 21 and the liquid temperature detector 22, and
- Fig. 5 shows a cross-sectional view thereof.
- the indirectly heated concentration detecting unit 21 and the liquid temperature detecting unit 22 are integrated with a mold resin 23.
- the indirectly heated concentration detection unit 21 is a thin film chip 21a including a heating element and a temperature sensing element, and a concentration detection unit bonded by the thin film chip and a bonding material 21b. It has metal fins 21c as heat transfer members, and external electrode terminals 21e that are electrically connected to the electrodes of the heating element and the temperature sensing element of the thin film chip by bonding wires 21d.
- the liquid temperature detection unit 22 has a similar configuration, and includes metal fins 22c and external electrode terminals 22e as heat transfer members for the liquid temperature detection unit.
- FIG. 6 shows an exploded perspective view of the thin film chip 21 a of the indirectly heated concentration detector 21.
- the thin film chip 2 la has, for example, a substrate 21al made of Al 2 O, a temperature sensing element 21a2 made of Pt, and an SiO force.
- a protective film 21a6 that also has SiO force and an electrode pad 21a7 made of TiZAu are sequentially stacked as appropriate.
- the temperature sensing element 21a2 is formed in a meandering pattern.
- the thin film chip 22a of the liquid temperature detector 22 has the same structure, but the heating element Only the temperature sensor 22a2 is allowed to act without acting.
- the identification sensor unit 2 has a base 2a attached to the lower end of the support part 4, and an O-ring 2b is attached when the base is attached. Is intervened.
- the side surface of the substrate 2a is attached with the mold grease 23 of the indirectly heated concentration detector 21 and the liquid temperature detector 22 via an O-ring 2c.
- a cover member 2d is attached to the base body 2a so as to surround the fins 21c for concentration detection part and the fins 22c for liquid temperature detection part.
- a liquid introduction path 24 to be measured is formed that is open in the vertical direction and extends in the vertical direction through the concentration detection unit fins 21c and the liquid temperature detection unit fins 22c. Note that, by attaching the cover member 2d to the base 2a, the flange portion of the mold resin 23 is pressed toward the base 2a, whereby the mold resin 23 is fixed to the base 2a.
- a circuit board 6 constituting a liquid type detection circuit to be described later is disposed at the upper end of the support part 4, and a lid member 8 is attached so as to cover the circuit board.
- the support part 4 stores the indirectly heated concentration detection part 21 and the liquid temperature detection part 22 of the identification sensor part 2 and the wiring 10 that electrically connects the circuit board 6.
- the circuit board 6 is equipped with a microcomputer that constitutes an arithmetic unit described later.
- Wiring 14 for communication between the circuit board 6 and the outside is provided through a connector 12 provided on the lid member 8.
- the arithmetic unit can be arranged outside the circuit board 6 instead of being on the circuit board 6, and in this case, the circuit board 6 and the arithmetic unit are connected via the wiring 14.
- the base 2a, the cover member 2d, the support 4 and the lid member 8 of the identification sensor unit 2 are all made of a corrosion-resistant material such as stainless steel.
- the pressure sensor 3 is directly attached to the base body 2a of the identification sensor unit 2, and thus is indirectly attached to the support unit 4.
- the support 4 also houses a wiring 11 that electrically connects the pressure sensor 3 and the circuit board 6.
- FIG. 7 shows the configuration of a circuit for detecting the liquid level in the present embodiment.
- a bridge circuit 68 is formed by the temperature sensor 21a2 of the indirectly heated concentration detection unit 21, the temperature sensor 22a2 of the liquid temperature detection unit 22, and the two resistors 64 and 66.
- the output of the bridge circuit 68 is input to the differential amplifier 70, and the output of the differential amplifier (both the concentration detection circuit output or the sensor output) v, u) is input to a microcomputer 72 constituting the calculation unit via an AZD change (not shown).
- a liquid temperature corresponding output value corresponding to the temperature of the liquid to be measured is input to the microcomputer 72 via the liquid temperature detecting amplifier 71 from the temperature sensing element 22a2 of the liquid temperature detecting unit 22.
- the microcomputer 72 outputs a heater control signal for controlling opening and closing of the switch 74 located in the energization path to the heating element 21a4 of the indirectly heated concentration detection unit 21.
- the urea aqueous solution US that is the liquid to be measured When the urea aqueous solution US that is the liquid to be measured is accommodated in the tank 100, the urea aqueous solution also enters the urea aqueous solution introduction path 24 that is the liquid to be measured introduction path formed by the cover member 2 d of the identification sensor unit 2. US is satisfied.
- the urea aqueous solution US in the tank 100 including the urea aqueous solution introduction path 24 does not substantially flow.
- the heating element 21a4 By closing the switch 74 for a predetermined time (for example, 8 seconds) by a heater control signal output from the microcomputer 72 to the switch 74, the heating element 21a4 has a single height (for example, 10V). One pulse voltage P is applied to cause the heating element to generate heat.
- the output voltage (sensor output) Q of the differential amplifier 70 at this time gradually increases during voltage application to the heating element 21a4 as shown in FIG. 8, and gradually after the voltage application to the heating element 21a4 ends. Decrease.
- the microcomputer 72 samples the sensor output a predetermined number of times (for example, 256 times) for a predetermined time (for example, 0.1 second) before the voltage application to the heating element 21a4 is started. Then, the average initial voltage value VI is obtained by calculating to obtain the average value. This average initial voltage value VI corresponds to the initial temperature of the temperature sensing element 21a2.
- the first time which is a relatively short time from the start of the voltage application to the heating element (for example, 0. 5 to 3 seconds; 2 seconds in Fig. 8) (specifically, just before the first time elapses)
- the sensor output is sampled a predetermined number of times (for example, 256 times)
- the average value is calculated.
- This average first voltage value V2 corresponds to the first temperature when the first time elapses from the start of the single pulse application of the temperature sensing element 21a2.
- a second time for example, a single pulse application time; 8 seconds in FIG. 8
- Time specifically Sample the sensor output a predetermined number of times (for example, 256 times) just before the second time elapses, and calculate the average value to obtain the average second voltage value V3.
- the second voltage value V02 corresponding to concentration is mainly influenced by the kinematic viscosity of the liquid. ). This is because in the second stage, natural convection occurs due to the liquid to be measured heated in the first stage, and the ratio of heat transfer due to this increases.
- the present invention identifies the concentration by utilizing the fact that the relationship between the concentration-corresponding first voltage value V01 and the concentration-corresponding second voltage value V02 varies depending on the concentration of the solution. That is, the concentration-corresponding first voltage value V01 and the concentration-corresponding second voltage value V02 are affected by different physical properties of the liquid, i.e., thermal conductivity and kinematic viscosity. ), The above-described density discrimination becomes possible.
- the first calibration curve indicating the relationship between the temperature and the concentration-corresponding first voltage value V01 and the temperature and concentration for several urea aqueous solutions (reference urea aqueous solution) with known urea concentrations.
- a second calibration curve showing the relationship with the corresponding second voltage value V02 is obtained in advance, and these calibration curves are stored in the storage means of the microcomputer 72. Examples of the first and second calibration curves are shown in Figs. 9 and 10, respectively.
- a calibration curve is created for a reference urea aqueous solution having a urea concentration cl (for example, 27.5%) and c 2 (for example, 37.5%).
- the concentration-corresponding first voltage value V01 and the concentration-corresponding second voltage value V02 depend on the temperature, and therefore, these calibration curves are used to identify the liquid to be measured. In this case, it is input from the temperature sensing element 22a2 of the liquid temperature detection unit 22 via the liquid temperature detection amplifier 71.
- the output value T corresponding to the liquid temperature is also used.
- Figure 11 shows an example of the output value ⁇ ⁇ corresponding to the liquid temperature.
- Such a calibration curve is also stored in the storage means of the microcomputer 72.
- a temperature value is obtained from the liquid temperature-corresponding output value V obtained for the liquid to be measured V using the calibration curve in FIG.
- the obtained temperature value is t.
- cx of the concentration-corresponding first voltage value VOl (cx; t) obtained for the liquid to be measured is used as the concentration-corresponding first voltage value V01 (cl; t), VOl (c2; t) of each calibration curve.
- FIG. 12 is a flowchart showing a liquid level detection process in the microcomputer 72.
- the pressure sensor 3 detects the hydraulic pressure ⁇ of the urea aqueous solution, and the detected hydraulic pressure value is detected by the microcomputer. Based on this, the microcomputer 72 calculates a temporary liquid level H when the aqueous urea solution has a predetermined density, for example, water having a urea concentration of zero and density power (ST1). In this calculation, the following relationship obtained from the relationship (shown in FIG. 13) between the liquid pressure P [kPa] of water measured in advance by the pressure sensor 3 and the liquid level (provisional liquid level value) H [cm].
- the urea concentration value C obtained using the concentration identification sensor unit 2 as described above is input to the microcomputer 72. Based on this, the microcomputer 72 calculates the density value ⁇ of the urea aqueous solution having the urea concentration value C (ST2). The relationship of the change in density / 0 [g / cm 3 ] of the urea aqueous solution to the change in the urea concentration C [wt%] is as shown in Fig. 14. The following relational expression obtained from this (4)
- This liquid level detection routine based on concentration discrimination is executed as needed when the vehicle engine starts, periodically, when requested by the driver or the vehicle (ECU), or when the vehicle key is turned off.
- the level of the aqueous urea solution in the urea tank can be monitored in a desired manner.
- a signal indicating the concentration and liquid level obtained in this way is output to an output buffer circuit 76 shown in FIG. 7 via a DZA converter (not shown), and this force is also output as an analog output to an automobile engine (not shown). Is output to the main computer (ECU) that controls the combustion of the engine.
- the analog output voltage value corresponding to the liquid temperature is also output to the main computer (ECU).
- the signal indicating the concentration and liquid level is taken out as a digital output if necessary, and is displayed and alerted. Information can be input to the device that performs other operations.
- the above concentration discrimination uses natural convection and uses the principle that the kinematic viscosity of the liquid to be measured such as urea aqueous solution and the sensor output have a correlation.
- forced flow based on external factors occurs as much as possible in the liquid to be measured, such as urea aqueous solution, around the concentration detection unit fin 21c and the liquid temperature detection unit fin 22c.
- a cover member 2d that forms a measured liquid introduction path such as a urea water solution introduction path in the vertical direction.
- the cover member 2d also functions as a protective member that prevents contact of foreign matter.
- an aqueous urea solution is used as the fluid.
- the liquid may be an aqueous solution or other liquid using a solute whose density varies depending on the concentration. Good.
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- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP05795597A EP1806566A4 (en) | 2004-10-25 | 2005-10-20 | LIQUID LEVEL DETECTING METHOD AND LIQUID LEVEL DETECTING DEVICE |
US11/666,131 US20090056437A1 (en) | 2004-10-25 | 2005-10-20 | Liquid Level Detecting Method and Liquid Level Detecting Device |
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JP2004309647A JP4390066B2 (ja) | 2004-10-25 | 2004-10-25 | 液位検出方法及び液位検出装置 |
JP2004-309647 | 2004-10-25 |
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EP (1) | EP1806566A4 (ja) |
JP (1) | JP4390066B2 (ja) |
WO (1) | WO2006046457A1 (ja) |
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DE102020134912A1 (de) * | 2020-04-30 | 2021-11-04 | AST (Advanced Sensor Technologies) International GmbH | Sensoranordnung für ein Fluid, Fluidtank und Verwendung der Sensoranordnung |
US11885728B2 (en) * | 2020-12-23 | 2024-01-30 | Battelle Energy Alliance, Llc | Mass measurement systems and related methods for measuring mass of solids within a liquid |
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JPS6138526A (ja) * | 1984-07-31 | 1986-02-24 | Mitsubishi Heavy Ind Ltd | 差圧式液位計 |
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- 2004-10-25 JP JP2004309647A patent/JP4390066B2/ja not_active Expired - Fee Related
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2005
- 2005-10-20 EP EP05795597A patent/EP1806566A4/en not_active Withdrawn
- 2005-10-20 WO PCT/JP2005/019278 patent/WO2006046457A1/ja active Application Filing
- 2005-10-20 US US11/666,131 patent/US20090056437A1/en not_active Abandoned
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JPS6138526B2 (ja) | 1980-11-12 | 1986-08-29 | Sanyo Electric Co | |
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JP2004125465A (ja) * | 2002-09-30 | 2004-04-22 | Mitsui Mining & Smelting Co Ltd | ガソリンの液種識別装置およびガソリンの液種識別方法 |
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JP2008267147A (ja) * | 2007-04-16 | 2008-11-06 | Sumitomo (Shi) Construction Machinery Manufacturing Co Ltd | 建設機械の燃料判別装置 |
Also Published As
Publication number | Publication date |
---|---|
US20090056437A1 (en) | 2009-03-05 |
EP1806566A4 (en) | 2008-04-09 |
JP4390066B2 (ja) | 2009-12-24 |
EP1806566A1 (en) | 2007-07-11 |
JP2006119088A (ja) | 2006-05-11 |
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