EP4226070A1 - Method for determining a line length - Google Patents
Method for determining a line lengthInfo
- Publication number
- EP4226070A1 EP4226070A1 EP21786872.8A EP21786872A EP4226070A1 EP 4226070 A1 EP4226070 A1 EP 4226070A1 EP 21786872 A EP21786872 A EP 21786872A EP 4226070 A1 EP4226070 A1 EP 4226070A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure line
- electrical conductor
- electrical resistance
- length
- electrical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000004020 conductor Substances 0.000 claims abstract description 32
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000004202 carbamide Substances 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 12
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 18
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 14
- 239000003638 chemical reducing agent Substances 0.000 description 9
- 229910021529 ammonia Inorganic materials 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000011010 flushing procedure Methods 0.000 description 3
- 239000002243 precursor Substances 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013479 data entry Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/026—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring length of cable, band or the like, which has been paid out, e.g. from a reel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
- F16L53/30—Heating of pipes or pipe systems
- F16L53/35—Ohmic-resistance heating
- F16L53/38—Ohmic-resistance heating using elongate electric heating elements, e.g. wires or ribbons
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B1/00—Details of electric heating devices
- H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
- H05B1/0227—Applications
- H05B1/023—Industrial applications
- H05B1/0236—Industrial applications for vehicles
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/40—Heating elements having the shape of rods or tubes
- H05B3/54—Heating elements having the shape of rods or tubes flexible
- H05B3/58—Heating hoses; Heating collars
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
- Y02T10/12—Improving ICE efficiencies
Definitions
- the invention relates to a method for determining the length of a heated pressure line for a delivery device for an aqueous urea solution in a motor vehicle from a tank to an injector, the pressure line being electrically heatable and by applying a voltage to an electrical conductor routed on the pressure line Utilization of the ohmic resistance is heated.
- ammonia As a reducing agent, the use of ammonia (NH3) as a reducing agent has emerged as a possible alternative. Due to the chemical properties and the legal regulations in many countries, the ammonia is not usually kept as pure ammonia, since this can lead to problems, particularly in motor vehicles or other mobile applications. Rather become instead of storing the reducing agent itself, reducing agent precursors are often stored and carried along.
- a reducing agent precursor is understood to mean, in particular, a substance which splits off the reducing agent or can be chemically converted into the reducing agent. For example, for the reducing agent, ammonia, urea is a reducing agent precursor.
- the aqueous ammonia solution, the urea is carried in a tank and pumped into the exhaust tract in precisely metered quantities using a suitable pumping device.
- the aqueous ammonia solution is guided along a pressure line from the conveying device to an injector.
- the aqueous urea solution is finally introduced into the exhaust tract by the injector, where it is thermally converted into ammonia and water in order to subsequently reduce the nitrogen oxides contained in the exhaust gas.
- One exemplary embodiment of the invention relates to a method for determining the length of a heated pressure line for a delivery device for an aqueous urea solution in a motor vehicle from a tank to an injector, the pressure line being electrically heatable and by applying a voltage to an electrical line connected to the pressure line conductor is heated using the ohmic resistance, whereby the length of the pressure line is calculated using the following formula: where A denotes the cross section of the electrical conductor, and p denotes the specific electrical resistance of the electrical conductor and R heating line denotes the electrical resistance of the electrical conductor used to heat the pressure line.
- the fluid is routed from the tank to the injector by flowing through the following elements. From the tank through a connection element, for example a connector, through the actual pressure line, through another connection element, for example a connector, to the injector, through which the fluid is finally introduced into the exhaust tract.
- a connection element for example a connector
- another connection element for example a connector
- the length of the pressure line is an important factor in ensuring fault-free operation of the conveying device. This is important in order, for example, to be able to correctly flush the pressure line and also to pre-supply fluid into the pressure line. Changing the length of the pressure line would mean that the flushing time or the pre-delivery time would no longer be sufficient or would be too long. An exact adaptation to the pressure line actually used is therefore necessary.
- the approach pursued here is based on the fact that, on the one hand, the properties associated with the material of the electrical conductor, such as the specific electrical resistance and the cross section, are known and, on the other hand, the tion of the functioning as a heating electrical conductor is known. In this way, the length of the pressure line can be calculated retrospectively from the known line intake.
- R heating line is given by the formula: where R total corresponds to the total electrical resistance of the heating line used to heat the pressure line and the electrical resistance of the electrically heatable connectors used on the pressure line.
- the electrical resistance of the electrical conductor used to heat the pressure line results from the total resistance of the heating device as a whole, i.e. electrical conductors on the pressure line and the connectors, minus the electrical resistance of the two heatable connectors used.
- the total electrical resistance R total results from the ratio of the applied voltage U to the current I, with the power P used for heating resulting from the multiplication of the applied voltage U and the current I.
- the total resistance of the heating device can be determined with a known amperage or voltage, with the voltage being regularly defined by the existing on-board electrical system of the motor vehicle and thus being known.
- a preferred embodiment is characterized in that the pressure line is coated with an electrically conductive material, which forms the electrical conductor.
- the pressure line is preferably made of a flexible material such as a plastic, which also has a sufficiently high has bursting strength.
- a plastic line can be completely or partially covered with a metallic, electrically conductive layer. This layer then forms the heating element.
- the length of the pressure line is determined for the first time after the final assembly has taken place, with the determined value being stored in a memory of the conveying device that cannot be overwritten.
- the final assembly can be defined, for example, by the final assembly in the vehicle. In any case, this means a point in time after which no structural changes to the system, such as the replacement of parts, are planned.
- the conveyor device and in particular the pressure line are in an installed state that also corresponds to the state in the later planned use.
- a value is determined which is stored in a memory of the conveying device in an unchangeable manner.
- the line length determined is then used on the one hand to be able to correctly map the other relevant functions of the delivery device, such as flushing and pre-delivery, and for example to be able to set the delivery time of the fluid pump as precisely as possible.
- the determined line length is stored as a reference value in order to be able to recognize a change in the overall system, for example by replacing the pressure line.
- the method is carried out repeatedly at defined points in time during the service life of the motor vehicle and a comparison of the value stored in the non-overwritable memory is carried out.
- a current value for the length of the pressure line is determined again in each case. By comparing it with the original The determined and stored value can be used to recognize a change in the system.
- a change in the electrical resistance can also be detected in this way, and a defect, for example due to a broken electrical conductor, can thus be detected.
- an error message is generated when a discrepancy is detected between the value stored in the non-writable memory and the newly determined value.
- An error message can trigger a display in the driver's field of vision so that he is informed about a detected irregularity.
- the error message is stored in a memory of the conveyor device or the motor vehicle in order to use it for diagnostic purposes.
- the pressure line is made of an electrically conductive material, with the pressure line itself forming the electrical conductor for heating.
- the pressure line can be wrapped with an electrical conductor, for example.
- the electrical conductor whether as a coating, as a fluid-carrying component itself or as a coiled conductor, can no longer be changed after final assembly of the system, so that the electrical conductor and thus the electrical resistance generated by the conductor is constant.
- the pressure line is connected to the tank in a fluid-conducting manner via a first connector at a free end and is connected to the injector in a fluid-conducting manner at the second free end by means of a second connector.
- Connectors are components that are used to connect two components securely against pressure. Among other things, there are also connectors that can be electrically heated themselves. These have an electrical conductor that surrounds the fluid channel and is energized can be used in order to heat up the connector. Each of the heatable connectors used therefore also has its own electrical resistance, which must be calculated using the method according to the invention to determine the exact length of the pressure line.
- control device in the conveying device is already described with a specific data record, this being completed by the value for the length of the pressure line determined after final assembly.
- Manual data entry of the control device can thus be dispensed with and the control devices of different motor vehicles could be provided with a uniform data record which is adapted to the respective specific boundary conditions on the basis of the method according to the invention.
- This also eliminates a source of error, among other things, since a data set with an incorrect value for the line length cannot be used by mistake. This increases the robustness of the system.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020212849.9A DE102020212849A1 (en) | 2020-10-12 | 2020-10-12 | Procedure for determining a line length |
PCT/EP2021/077213 WO2022078786A1 (en) | 2020-10-12 | 2021-10-04 | Method for determining a line length |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4226070A1 true EP4226070A1 (en) | 2023-08-16 |
Family
ID=78080303
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21786872.8A Withdrawn EP4226070A1 (en) | 2020-10-12 | 2021-10-04 | Method for determining a line length |
Country Status (5)
Country | Link |
---|---|
US (1) | US20230375324A1 (en) |
EP (1) | EP4226070A1 (en) |
CN (1) | CN116368387A (en) |
DE (1) | DE102020212849A1 (en) |
WO (1) | WO2022078786A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10344137A1 (en) | 2003-09-24 | 2005-05-04 | Rasmussen Gmbh | Electrically heated liquid line |
GB0503891D0 (en) * | 2005-02-25 | 2005-04-06 | Allen Group Ltd | Electrically-heated pipes |
DE102005029290A1 (en) | 2005-06-22 | 2007-01-11 | Eichenauer Heizelemente Gmbh & Co. Kg | Reductant supply system for vehicle exhaust gas purification catalyst, includes corrosion-resistant metal pipe with connections for electrical heating in frosty weather |
SE1050045A1 (en) * | 2010-01-18 | 2011-07-19 | Scania Cv Ab | fluid Management Systems |
EP2966334B1 (en) * | 2014-07-10 | 2018-09-05 | Littelfuse Italy S.r.l. | Heated flow line for a fluid-feeding system in a motor vehicle |
CN111239486A (en) * | 2020-02-06 | 2020-06-05 | 张军 | Electric energy monitoring method and system |
-
2020
- 2020-10-12 DE DE102020212849.9A patent/DE102020212849A1/en active Pending
-
2021
- 2021-10-04 US US18/031,197 patent/US20230375324A1/en active Pending
- 2021-10-04 WO PCT/EP2021/077213 patent/WO2022078786A1/en unknown
- 2021-10-04 CN CN202180069659.0A patent/CN116368387A/en active Pending
- 2021-10-04 EP EP21786872.8A patent/EP4226070A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
US20230375324A1 (en) | 2023-11-23 |
DE102020212849A1 (en) | 2022-04-14 |
CN116368387A (en) | 2023-06-30 |
WO2022078786A1 (en) | 2022-04-21 |
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