WO2005026709A1 - 尿素溶液の尿素濃度識別装置 - Google Patents
尿素溶液の尿素濃度識別装置 Download PDFInfo
- Publication number
- WO2005026709A1 WO2005026709A1 PCT/JP2004/013213 JP2004013213W WO2005026709A1 WO 2005026709 A1 WO2005026709 A1 WO 2005026709A1 JP 2004013213 W JP2004013213 W JP 2004013213W WO 2005026709 A1 WO2005026709 A1 WO 2005026709A1
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- WIPO (PCT)
- Prior art keywords
- concentration
- urea solution
- urea
- liquid temperature
- voltage value
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/05—Systems for adding substances into exhaust
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/148—Arrangement of sensors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
- F01N2900/1818—Concentration of the reducing agent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- 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
- Y02T10/40—Engine management systems
Definitions
- the present invention is applied to a system for purifying exhaust gas discharged from a car such as an internal combustion engine of an automobile, and is sprayed onto an exhaust gas purifying catalyst to decompose nitrogen oxides (NOx).
- the present invention relates to an apparatus for identifying the concentration of urea in a urea solution.
- One of such measures is to use an exhaust gas purifying catalyst device.
- a three-way catalyst for purifying exhaust gas is placed in the exhaust system, where CO, HC, NOx, etc. are decomposed by oxidation reduction to make them harmless.
- An aqueous urea solution is sprayed on the catalyst immediately upstream of the catalytic converter in the exhaust system to maintain the NOx decomposition in the catalytic converter continuously.
- This urea aqueous solution needs to be in a specific urea concentration range in order to enhance the effect of NOx decomposition, and it is said that a urea concentration of 32.5% is particularly optimal.
- the urea solution is stored in a urea solution tank mounted on an automobile, and the concentration may change over time, and the concentration distribution may be locally uneven in the tank. There is also.
- the urea solution supplied to the spray nozzle through the supply pipe by the tank power pump is generally collected at the outlet force near the bottom of the tank. It is important to increase efficiency.
- NOx sensors are arranged on the upstream and downstream sides of the catalytic converter, respectively, and based on the difference in NOx concentration detected by these sensors, whether the NOx decomposition was optimally performed or not was determined. Has been determined.
- this approach actually reduces NOx Therefore, it is not possible to identify the urea concentration not only before urea solution spraying but also at the beginning of spraying. Also, the NOx sensor used in such a method could not be said to have sufficient sensitivity to achieve injection of a urea solution of good concentration.
- Patent Document 1 a heating element is caused to generate heat by energization, and the heat is used to heat a temperature sensing element, and the heat transfer from the heating element to the temperature sensing element is thermally affected by the discriminated fluid.
- a fluid identification method for determining the type of the fluid to be identified based on an electrical output corresponding to the electrical resistance of the temperature sensing element, which periodically supplies current to the heating element is disclosed.
- the energization of the heating element is performed periodically (that is, performed in multiple pulses), so that it takes time for identification, and the fluid can be identified instantaneously. It is difficult.
- This method is also applicable to the identification of the urea concentration of urea solution as described above, for example, the ability to identify fluids based on representative values for substances with very different properties such as water, air, and oil. It is difficult to perform accurate and quick identification.
- Patent Document 1 JP-A-11-153561 (in particular, paragraphs [0042]-[0049])
- an object of the present invention is to provide a urea solution identification device capable of accurately and quickly identifying the urea concentration of a urea solution.
- an object of the present invention is to provide a urea solution identification device capable of identifying the concentration even under vibration conditions.
- An apparatus for identifying a urea concentration of a urea solution contained in a tank A concentration identification sensor portion, and a support portion provided with an attachment portion at one end to which the concentration identification sensor portion is attached and an attachment portion to be attached to an opening of the tank at the other end portion.
- the concentration identification sensor unit includes an indirectly heated concentration detecting unit including a heating element and a temperature sensing element, and a liquid temperature detecting unit that measures the temperature of the urea solution.
- the liquid temperature detecting section includes a heat transmitting member for a concentration detecting section for heat exchange with the urea solution and a heat transmitting member for a liquid temperature detecting section, and the concentration identifying sensor section includes the heat transmitting member for the concentration detecting section.
- the concentration identification sensor unit includes an enclosure that three-dimensionally surrounds the urea solution introduction path without closing both ends of the urea solution introduction path, and the enclosure has one end in the longitudinal direction.
- a first flow hole and a second flow hole through which the urea solution can flow are formed at positions separated from an extension of the urea solution introduction path on the surface and the other end surface, respectively. Are located apart from a line extending in the longitudinal direction through the first communication hole,
- a single pulse voltage is applied to the heating element of the indirectly heated concentration detecting section to cause the heating element to generate heat, and includes a temperature sensing element of the indirectly heated concentration detecting section and the liquid temperature detecting section.
- a urea concentration discrimination device for a urea solution wherein the discrimination calculation unit discriminates the urea concentration based on an output of the concentration detection circuit.
- the one end surface and the other end surface of the enclosure are each separated by 3 mm or more from both ends of the urea solution introduction path.
- both the first flow hole and the second flow hole have a major axis of 10 mm or less.
- the enclosure has a cylindrical shape having the one end surface and the other end surface as both end surfaces.
- the discrimination calculation unit is configured to determine the urea by a concentration-corresponding voltage value corresponding to a difference between an initial temperature and a peak temperature of the thermosensitive element when the heating element generates heat.
- the concentration is identified.
- the voltage is obtained by sampling the initial voltage before the start of the single pulse application to the heating element as a voltage value corresponding to the initial temperature of the temperature sensing element a predetermined number of times and averaging it. Using the averaged initial voltage value obtained, the peak voltage before the end of the single pulse application to the heating element is sampled a predetermined number of times as a voltage value corresponding to the peak temperature of the thermosensitive element, and the average is obtained by averaging. A peak voltage value is used, and a 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 urea solution is input from the liquid temperature detecting unit to the discrimination calculation unit.
- the solution temperature-corresponding output value and the concentration obtained The urea concentration is identified based on the corresponding voltage value.
- the identification calculation section includes a microcomputer.
- a circuit board constituting the density detection circuit is disposed at the other end of the support section, and the density identification sensor section and the circuit board are provided on the support section. Are electrically connected to each other.
- the microcomputer is provided on the circuit board.
- the concentration identification sensor section is disposed in the tank, and is less affected by external environmental conditions and stably. Urea concentration discrimination with good accuracy can be performed.
- a single pulse voltage is applied to the heating element of the indirectly heated concentration detection section to cause the heating element to generate heat, and the identification calculation section performs the operation based on the output of the concentration detection circuit. Since the urea concentration is identified, the urea concentration of the urea solution can be identified accurately and quickly. In particular, the urea concentration is identified based on the concentration-corresponding voltage value corresponding to the difference between the initial temperature and the peak temperature of the thermosensitive element when the heating element generates heat. For example, the average peak voltage value and the average initial voltage are used as the concentration-corresponding voltage values. By using the difference from the value, stable, accurate and quick identification becomes possible.
- a cover member forming a urea solution introduction passage open at both ends is provided so as to surround the heat transfer member for the concentration detection unit and the heat transfer member for the liquid temperature detection unit. Therefore, it is possible to improve the accuracy of concentration discrimination such that forced flow based on external factors does not easily occur in the urea solution around the heat transfer member.
- the enclosure is provided in the concentration identification sensor portion, and the first and second flow holes having the specific arrangement are formed on the specific surface of the enclosure.
- the decrease in identification accuracy is small even under the condition where is vibrating.
- FIG. 1 is an exploded perspective view showing one embodiment of a urea concentration identification device according to the present invention.
- FIG. 2 is a partially omitted cross-sectional view
- FIG. 3 is a view showing a state where the tank is attached to the tank.
- an opening 102 is provided at an upper part of a urea solution tank 100 for decomposing NOx which constitutes an exhaust gas purification system mounted on an automobile.
- a urea concentration discriminating device 104 according to the present invention is attached to the section.
- the tank 100 is provided with an inlet pipe 106 for injecting the urea solution and an outlet pipe 108 for taking out the urea solution.
- the outlet pipe 108 is connected to the tank at a height near the bottom of the tank 100, and is connected to a urea solution atomizer (not shown) via a urea solution supply pump 110! RU
- the urea solution is sprayed on the catalyst device by the urea solution sprayer disposed immediately before the exhaust gas purification catalyst device.
- the urea concentration identification device includes a concentration identification sensor 2 and a support 4. At one end (lower end) of the support section 4 is attached the concentration identification sensor section 2, and at the other end (upper end) of the support section 4 is provided an attachment section 4 a for attaching to the tank opening 102. It is provided.
- the concentration identification sensor unit 2 has an indirectly heated concentration detection unit 21 including a heating element and a temperature sensing element, and a liquid temperature detection unit 22 for measuring the temperature of the urea solution.
- the indirectly heated concentration detecting section 21 and the liquid temperature detecting section 22 are arranged at a certain distance in the vertical direction.
- FIG. 4 is an enlarged view of the indirectly heated concentration detecting section 21 and the liquid temperature detecting section 22, and
- FIG. 5 is a cross-sectional view thereof.
- the indirectly heated concentration detecting section 21 and the liquid temperature detecting section 22 are integrally formed by a mold resin 23. As shown in FIG.
- 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 joined by the thin film chip and the bonding material 21b. It has a metal fin 21c as a heat transfer member, and external electrode terminals 21e which are electrically connected to electrodes of a heating element and a temperature sensing element of a thin film chip by bonding wires 21d, respectively.
- the liquid temperature detecting section 22 has a similar configuration, and has a metal fin 22c and an external electrode terminal 22e as a heat transfer member for the liquid temperature detecting section.
- FIG. 6 is an exploded perspective view of the thin-film chip 21a of the indirectly heated concentration detecting section 21.
- the thin film chip 2 la is composed of, for example, a substrate 21al made of Al O, a temperature sensing element 21a2 made of Pt, and SiO.
- heating element 21a4 also having TaSiO force
- heating element electrode 21a5 also having N
- a protective film 21a6 that also has an SiO force and an electrode pad 21a7 made of TiZAu
- the temperature sensing element 21a2 is formed in a meandering pattern (not shown). Note that the thin film chip 22a of the liquid temperature detecting section 22 has the same structure, but only the temperature sensing element 22a2 works without operating the heating element.
- the concentration discrimination sensor unit 2 has a base 2a attached to the lower end of the support unit 4, and the O-ring 2b is attached when the base is attached. It can be intervened.
- the mold resin 23 of the indirectly heated concentration detection unit 21 and the liquid temperature detection unit 22 is attached to the side surface of the base 2a via an O-ring 2c.
- the base 2a is provided with a cover member 2d so as to surround the fins 21c for the concentration detecting section and the fins 22c for the liquid temperature detecting section.
- a urea solution introduction passage 24 is formed which extends vertically through the fins 21c for the concentration detecting section and the fins 22c for the liquid temperature detecting section and is open at both upper and lower ends.
- the supporting portion 4 includes the indirectly heated concentration detecting portion 21 and the liquid temperature detecting portion 21 of the concentration identification sensor portion 2.
- the wiring 10 for electrically connecting the circuit board 22 to the circuit board 6 is housed.
- the circuit board 6 is equipped with a microcomputer (microcomputer) that constitutes an identification operation unit described later.
- a wiring 14 for communication between the circuit board 6 and the outside is provided via a connector 12 provided on the lid member 8.
- the discrimination calculation unit may be disposed outside the circuit board 6 instead of on the circuit board 6. In this case, the circuit board 6 and the discrimination calculation unit are connected via the wiring 14.
- the concentration discrimination sensor unit 2 does not block the upper and lower ends of the urea solution introduction path 24 (preferably at least 3mm apart) and surrounds the urea solution introduction path. Is provided with an enclosure 2e for three-dimensionally enclosing.
- the surrounding body 2e has a cylindrical shape having a flat upper end face plate 2el, a lower end face plate 2e2, and a cylindrical side plate 2e3, and a central portion of the upper end face plate 2el is joined to the base 2a by welding or the like.
- the upper end plate 2el has a first flow hole 26 through which a urea solution can flow
- the lower end plate 2e2 has a second flow hole 27 through which a urea solution can flow.
- These flow holes 26 and 27 are located at positions separated from the extension of the urea solution introduction passage 24, and the force is also separated from a line extending through the first flow hole 26 and extending in the longitudinal direction (vertical direction) of the support 4.
- the second circulation hole 27 is located.
- the first and second flow holes 26 and 27 are, for example, circular openings having a diameter of S 10 mm or less, and a non-circular opening has a major axis of 10 mm or less.
- the enclosure 2e has a horizontal dimension (diameter) of, for example, 50-100 cm in the X and Y directions, and a vertical dimension of, for example, 80-150 cm.
- the dimension of the urea solution introduction path 24 in the up-down direction is, for example, 114 cm.
- the enclosure 2e prevents the influence of the urea solution inside the tank 100 from flowing into the urea solution introduction passage 24 even if the tank 100 vibrates, so that the accuracy of concentration identification is extremely high. This is provided so as not to lower it, and its operation will be described later. If the size of the enclosure 2e is too large, the urea solution easily flows in the enclosure. If the major diameters of the flow holes 26 and 27 are too large, the influence of the flow of the urea solution tends to reach into the urea solution introduction passage 24. Also, if the distance between the upper and lower ends of the urea solution introduction path 24 and the surrounding body 2e is less than 3 mm and is too small, the identification accuracy tends to decrease.
- FIG. 7 shows a configuration of a circuit for density identification in the present embodiment.
- a bridge circuit 68 is formed by the temperature sensing element 21a2 of the indirectly heated concentration detecting section 21, the temperature sensing element 22a2 of the liquid temperature detecting section 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 (also referred to as the concentration detection circuit output or the sensor output) is connected to a microcomputer constituting an identification operation unit via an AZD converter (not shown).
- a liquid temperature corresponding output value corresponding to the liquid temperature of the urea solution is input to the microcomputer 72 from the temperature sensing element 22a2 of the liquid temperature detecting unit 22 via the liquid temperature detecting amplifier 71.
- the microcomputer 72 outputs a heater control signal for controlling the opening and closing of the switch 74 located on the current supply path to the heating element 21a4 of the indirectly heated concentration detecting section 21.
- the urea solution US When the urea solution US is stored in the tank 100, the urea solution US is filled in the enclosure 2e of the concentration identification sensor unit 2 and also in the urea solution introduction passage 24 formed by the cover member 2d. You. When the tank 100 is stationary, the urea solution US in the tank 100 including the inside of the urea solution introduction passage 24 does not substantially flow.
- the switch 74 is closed for a predetermined time (for example, 4 seconds) by a heater control signal output from the microcomputer 72 to the switch 74, so that the heating element 21a4 has a predetermined height (for example, 10 V).
- the heating element is heated by applying one pulse voltage P.
- the output voltage (sensor output) Q of the differential amplifier 70 gradually increases while the voltage is being applied to the heating element 21a4, and gradually increases after the voltage application to the heating element 21a4, as shown in FIG. Decrease.
- the microcomputer 72 samples the sensor output for a predetermined number of times (for example, 256 times) for a predetermined time (for example, 1 second) before the start of voltage application to the heating element 21a4, and The calculation for obtaining the average value is performed to obtain the average initial voltage value VI.
- This average initial voltage value VI corresponds to the initial temperature of the temperature sensing element 21a2.
- the sensor output is sampled for a predetermined number of times (for example, 256 times) for a predetermined time (for example, 1 second) before the voltage application to the heat generating body 21a4 is stopped, and an average value thereof is obtained. Calculation is performed to obtain the average peak voltage value V2.
- V0 V2-V1
- a calibration curve indicating the relationship between the temperature and the concentration-corresponding voltage value V0 is obtained in advance for some urea aqueous solutions having a known urea concentration (reference urea solution). The quantity curve is stored in the storage means of the microcomputer 72.
- Fig. 9 shows an example of a calibration curve. In this example, calibration curves have been created for reference urea solutions with urea concentrations of 0%, 20% and 40%.
- the liquid temperature detector 22 The liquid temperature corresponding output value T input from the temperature sensing element 22a2 via the liquid temperature detection amplifier 71 is also used. An example of the output value T corresponding to the liquid temperature is shown in FIG. Such a calibration curve is also stored in the storage means of the microcomputer 72.
- FIG. 11 shows an example of the relationship between the concentration corresponding voltage value V0 obtained with urea solutions having different temperatures and urea concentrations and the actual concentration.
- the signal indicating the density value obtained in this manner is output to an output buffer circuit 76 shown in FIG. 7 via a DZA converter (not shown). It is output to the main computer (ECU) that controls the combustion of the fuel.
- FIG. 12 shows an example of the relationship between the analog output voltage value V0 'corresponding to the density and the actual density. It can be seen that the difference due to temperature in this relationship is small and sufficiently practicable.
- FIG. 13 shows an example of the relationship between the analog output voltage value T ′ corresponding to the liquid temperature and the actual temperature. The analog output voltage value T corresponding to the liquid temperature is also output to the main computer (ECU).
- signals indicating the concentration value and the liquid temperature value are digitally output as necessary. And can be input to a device that performs display, alarm, and other operations.
- the urea concentration of the urea solution described above is determined using the principle of t, which has a correlation between the kinematic viscosity of the urea solution and the sensor output using natural convection.
- t which has a correlation between the kinematic viscosity of the urea solution and the sensor output using natural convection.
- the urea solution around the fins 21c for the concentration detecting section and the fins 22c for the liquid temperature detecting section be hardly subjected to forced flow based on external factors as much as possible.
- a cover member 2d particularly one that forms a vertical urea solution introduction path. Note that the cover member 2d also functions as a protection member for preventing contact of foreign matter.
- the concentration of the urea solution used in the exhaust gas purification system is optimally 32.5%, for example, 25% to 40% is set as an appropriate range, and the appropriate range is outside this appropriate range.
- a warning can be issued.
- the urea in the tank decreases and the urea solution disappears in the urea solution introduction path 24
- the above-mentioned concentration discrimination is significantly different from the case where the concentration of the urea solution is within the appropriate range. Concentration-dependent voltage values that are far apart can be obtained, and in this case, a necessary warning can be issued.
- a warning is issued when it is detected that the temperature has dropped to a temperature close to the temperature at which the urea solution freezes (about -13 ° C.). Can be issued to emit a sound.
- the urea solution US in the tank 100 does not substantially forcibly flow has been described above.
- the tank 100 is Oscillation may cause a flow in the urea solution.
- the concentration discriminating sensor unit 2 is provided with the enclosure 2e, even if the urea solution flows outside the enclosure, the influence of the urea solution is particularly large in the enclosure 2e. It is difficult to reach the inside of the solution introduction path 24.
- the vibration of the tank 100 includes a vertical vibration and a horizontal vibration. A certain vibration having a large influence on the density identification as described above is a horizontal vibration.
- the concentration discriminating sensor unit 2 is disposed near the bottom of the tank. At this height, the flow of the urea solution has few vertical components and the horizontal component is dominant. Therefore, the upper end face plate 2el and the lower end face plate 2e2 of the enclosure 2e are each provided with one circulation hole that is not too large to allow the urea solution to flow between inside and outside the enclosure, and the side plate 2e3 is not provided with a hole. This minimizes the horizontal flow of the liquid in the tank outside the enclosure as described above.
- FIG. 14 to FIG. 20 show the results of experiments in which concentration identification was performed using the concentration identification device according to the present invention or for comparison.
- concentration identification was performed using the concentration identification device according to the present invention or for comparison.
- the urea solution used was 4 liters with a concentration of 32.5%.
- the density values obtained by measurement under various vibration speed conditions at a vibration of 40 mm in the X and Y directions are shown.
- the flow holes 26 and 27 formed in the upper end face plate 2el and the lower end face plate 2e2 are located at different positions in the XY plane (horizontal plane) and different from the urea solution introduction path 24.
- One with a diameter of 5mm at each position was formed one by one.
- the distance between the upper and lower ends of the urea solution introduction passage 24 and the upper and lower end face plates 2el and 2e2 was set to 5 mm. This is according to the present invention.
- the flow holes 26 and 27 formed in the upper end face plate 2el and the lower end face plate 2e2 have a diameter of 5 mm at the same position as the urea solution introduction passage 24 in the XY plane (horizontal plane). thing Were formed one by one. The distance between the upper and lower openings of the urea solution introduction passage 24 and the upper and lower end plates 2el and 2e2 of the enclosure was 5 mm.
- the flow holes 26 and 27 formed in the upper end face plate 2el and the lower end face plate 2e2 are located at different positions in the XY plane (horizontal plane) and different from the urea solution introduction path 24. Three pieces with a diameter of 5 mm at the position were formed. The distance between the upper and lower ends of the urea solution introduction passage 24 and the upper and lower end face plates 2el and 2e2 was set to 5 mm.
- the experiment of FIG. 20 was the same as the experiment of FIG. 19, except that the through hole was not provided in the lower end face plate 2e2 and the three through holes 27 ′ were provided in the side plate 2e3.
- FIG. 1 is an exploded perspective view showing an embodiment of a urea concentration identification device according to the present invention.
- FIG. 2 is a partially omitted cross-sectional view of the urea concentration identification device of FIG. 1.
- FIG. 3 is a view showing a state in which the urea concentration identification device of FIG. 1 is attached to a tank.
- FIG. 4 is an enlarged view of an indirectly heated concentration detection section and a liquid temperature detection section.
- FIG. 5 is a cross-sectional view of the indirectly heated concentration detector of FIG. 4.
- FIG. 6 is an exploded perspective view of a thin film chip of the indirectly heated concentration detector.
- FIG. 7 is a configuration diagram of a circuit for density identification.
- 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 calibration curve.
- FIG. 10 is a view showing an example of a liquid temperature corresponding output value T.
- FIG. 11 is a diagram illustrating an example of a relationship between a concentration corresponding voltage value V0 and an actual concentration.
- FIG. 12 is a diagram showing an example of a relationship between an analog output voltage value V0 ′ corresponding to a density and an actual density.
- FIG. 13 is a diagram showing an example of a relationship between an analog output voltage value T ′ corresponding to a liquid temperature and an actual temperature.
- FIG. 14 is a view showing an experimental result of concentration identification.
- FIG. 15 is a view showing an experimental result of concentration identification.
- FIG. 16 is a view showing an experimental result of concentration identification.
- FIG. 17 is a view showing an experimental result of concentration identification.
- FIG. 18 is a view showing an experimental result of concentration identification.
- FIG. 19 is a view showing an experimental result of concentration identification.
- FIG. 20 is a view showing an experimental result of concentration identification.
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/571,357 US7829024B2 (en) | 2003-09-11 | 2004-09-10 | Urea concentration identification device for urea solution |
CA002538779A CA2538779A1 (en) | 2003-09-11 | 2004-09-10 | Urea concentration identification device for urea solution |
EP04787853A EP1669742A4 (en) | 2003-09-11 | 2004-09-10 | UREA CONCENTRATION IDENTIFICATION DEVICE FOR UREA SOLUTION |
Applications Claiming Priority (2)
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JP2003-319775 | 2003-09-11 | ||
JP2003319775A JP3883197B2 (ja) | 2003-09-11 | 2003-09-11 | 尿素溶液の尿素濃度識別装置 |
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PCT/JP2004/013213 WO2005026709A1 (ja) | 2003-09-11 | 2004-09-10 | 尿素溶液の尿素濃度識別装置 |
Country Status (5)
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US (1) | US7829024B2 (ja) |
EP (1) | EP1669742A4 (ja) |
JP (1) | JP3883197B2 (ja) |
CA (1) | CA2538779A1 (ja) |
WO (1) | WO2005026709A1 (ja) |
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JP4188287B2 (ja) * | 2004-07-15 | 2008-11-26 | 三井金属鉱業株式会社 | 熱式センサ及びそれを用いた測定装置 |
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JP4616184B2 (ja) * | 2006-01-31 | 2011-01-19 | 日本特殊陶業株式会社 | 液体状態検知センサ |
JP4908335B2 (ja) * | 2006-08-09 | 2012-04-04 | 日本特殊陶業株式会社 | 液体状態検知センサ |
JP4947657B2 (ja) * | 2007-01-22 | 2012-06-06 | 日本特殊陶業株式会社 | 尿素水センサ |
US8137625B2 (en) * | 2007-01-22 | 2012-03-20 | Ngk Spark Plug Co., Ltd. | Urea sensor |
JP4925890B2 (ja) * | 2007-03-29 | 2012-05-09 | Udトラックス株式会社 | 液体還元剤判別装置及びエンジンの排気浄化装置 |
JP4687709B2 (ja) | 2007-04-25 | 2011-05-25 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
US7954312B2 (en) | 2007-05-09 | 2011-06-07 | Ford Global Technologies, Llc | Approach for detecting reductant availability and make-up |
JP4428445B2 (ja) * | 2007-09-05 | 2010-03-10 | トヨタ自動車株式会社 | 内燃機関の排気浄化装置 |
US20100313631A1 (en) * | 2008-02-04 | 2010-12-16 | Mitsui Mining & Smelting Co., Ltd. | Fluid Discrimination Method and Fluid Discrimination Apparatus |
WO2012176280A1 (ja) * | 2011-06-21 | 2012-12-27 | トヨタ自動車株式会社 | 排気浄化装置の異常検出装置 |
JP6049058B2 (ja) * | 2012-10-09 | 2016-12-21 | 株式会社サンエー | 流動体状態識別装置 |
US20140116808A1 (en) * | 2012-11-01 | 2014-05-01 | Ronald J. Kile | Lubricating oil monitoring and maintenance cap with oil level monitoring system |
EP2826972B1 (en) * | 2013-07-15 | 2016-04-20 | Inergy Automotive Systems Research (Société Anonyme) | Method for monitoring urea quality of an SCR system |
JP6212411B2 (ja) * | 2014-02-28 | 2017-10-11 | コベルコ建機株式会社 | 還元剤容器 |
TWI510778B (zh) | 2014-09-18 | 2015-12-01 | Ind Tech Res Inst | 液體濃度檢測裝置 |
EP3168439B1 (en) * | 2015-11-16 | 2019-03-20 | Wema System AS | Debubbling sleeve for fluid sensors and sensor systems comprising same |
DE102017200533A1 (de) * | 2017-01-13 | 2018-07-19 | Robert Bosch Gmbh | Verfahren zur Überwachung eines Qualitätssensors |
EP3369901B1 (en) * | 2017-03-03 | 2019-10-16 | MEAS France | Urea sensor protection assembly and urea sensor system |
EP3410079B1 (en) * | 2017-06-02 | 2021-06-02 | MEAS France | Fluid sensor protection assembly |
WO2021034226A1 (ru) * | 2019-08-19 | 2021-02-25 | Общество с ограниченной ответственностью "Маффин Ком" | Футляр для мобильного электронного устройства с функцией подогрева и зарядки |
CN113607809B (zh) * | 2021-07-28 | 2024-04-12 | 东风商用车有限公司 | 一种防气泡干扰的车用尿素溶液品质检测装置 |
CN113847130B (zh) * | 2021-10-29 | 2022-08-23 | 潍柴动力股份有限公司 | 一种尿素浓度的检测方法 |
CN115434788B (zh) * | 2022-08-12 | 2024-02-20 | 潍柴动力股份有限公司 | 一种尿素浓度传感器装置及控制方法 |
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- 2004-09-10 US US10/571,357 patent/US7829024B2/en not_active Expired - Fee Related
- 2004-09-10 EP EP04787853A patent/EP1669742A4/en not_active Withdrawn
- 2004-09-10 CA CA002538779A patent/CA2538779A1/en not_active Abandoned
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Also Published As
Publication number | Publication date |
---|---|
US7829024B2 (en) | 2010-11-09 |
CA2538779A1 (en) | 2005-03-24 |
EP1669742A4 (en) | 2012-06-13 |
US20080247912A1 (en) | 2008-10-09 |
JP3883197B2 (ja) | 2007-02-21 |
EP1669742A1 (en) | 2006-06-14 |
JP2005084025A (ja) | 2005-03-31 |
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