US20040177606A1 - Device and method for metering a reductant for eliminating nitrogen oxides from exhaust gases - Google Patents
Device and method for metering a reductant for eliminating nitrogen oxides from exhaust gases Download PDFInfo
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- US20040177606A1 US20040177606A1 US10/479,696 US47969604A US2004177606A1 US 20040177606 A1 US20040177606 A1 US 20040177606A1 US 47969604 A US47969604 A US 47969604A US 2004177606 A1 US2004177606 A1 US 2004177606A1
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- pressure
- metering
- line
- reducing agent
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- 239000007789 gas Substances 0.000 title claims abstract description 27
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 8
- 230000003197 catalytic effect Effects 0.000 claims abstract description 15
- 230000001105 regulatory effect Effects 0.000 claims abstract 7
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 18
- 239000004202 carbamide Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000000443 aerosol Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims 1
- 239000003054 catalyst Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 description 1
Images
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
- 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]
-
- 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
-
- 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
- F01N2390/00—Arrangements for controlling or regulating exhaust apparatus
- F01N2390/04—Arrangements for controlling or regulating exhaust apparatus using electropneumatic components
-
- 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
- F01N2390/00—Arrangements for controlling or regulating exhaust apparatus
- F01N2390/06—Arrangements for controlling or regulating exhaust apparatus using pneumatic components only
-
- 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
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
-
- 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
- F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a device and a method for metering a reducing agent, particularly of urea or a urea-water solution within the scope of a catalytic exhaust gas treatment, according to the species defined in the independent claims.
- reduction catalysts were developed, particularly for Diesel engines, which are commonly subdivided into SCR catalysts (selective catalytic reduction) and storage catalysts.
- SCR catalysts reduce the nitrogen oxides by the use of a reducing agent, such as urea and/or ammonia, which is added to the exhaust gas, while the so-called storage catalysts are periodically regenerated, preferably using hydrocarbons of the internal combustion engine fuel that is carried along with it, in so-called exhaust gas rich phases.
- the metering device according to the present invention and the method according to the present invention having the characterizing features of the independent claims, have the advantage of making possible a compensation of manufacturing tolerances of the metering pipe and the metering line with respect to metering accuracy, of maintaining metering accuracy in the case of metering pipe outlet openings that are wearing and/or being stopped up, and of eliminating the influence of the exhaust gas counterpressure on the metering accuracy. Furthermore, no new plotting of a valve characteristic curve is required in the control unit, independently of the special design of the metering pipe and the metering line, so that time advantages come about in the application of the present invention.
- a constant pressure ratio across the metering agent or the metering valve can be set, so that the quotient of the reducing agent pressure upstream of the metering agent and the pressure downstream of the metering agent remains constant. This ensures a steady metering accuracy, so that both an ammonia breakthrough as a result of overmetering and a loss in nitrogen oxide conversion as a result of undermetering are certainly able to be avoided.
- FIG. 1 a metering system, connected together to a compressed air tank, a urea tank and a catalytic converter system, and
- FIG. 2 a corresponding system having an alternative metering device.
- FIG. 3 shows a control circuit diagram
- FIG. 4 shows another alternative metering device.
- FIG. 1 denotes a urea tank, from which a urea/water solution is conveyed, via a urea line 1 a having a check valve 2 and a filter 3 designed as a filtering strainer, sucked in by a metering pump 4 that is controlled by the engine speed, and via a check valve 6 to a metering valve 7 of a mixing chamber 8 .
- a quantity that is conveyed in excess is returned via a relief valve 11 and a return line 1 b provided with a check valve 2 a to the intake side of the pump.
- a relief valve is known, for example, from DE 198 05 070 C2.
- such a valve is furnished with reference numeral 5 and is designated there as a diaphragm valve, since a diaphragm separates a first chamber conveying the fluid, whose pressure is to be controlled, from a second chamber having a spring.
- This spring presses on the diaphragm against an outlet opening that carries off excess quantities of fluid, which is situated in the first chamber.
- the second chamber (reference numeral 20 in DE 198 05 070 C2) is also able to have pressure applied to it via lines, so that the pressure that is to be set via the relief valve may be varied. This can be performed hydraulically, as described in DE 198 05 070 C2, or pneumatically.
- pneumatic connection 13 The connection of such a line to the relief valve is denoted in the present Application as pneumatic connection 13 .
- a line 12 such as in the form of a hose, whose other end is connected to mixing chamber 8 , so that relief valve 11 is able to control the pressure of the urea/water solution in line 1 a as a function of the pressure in the mixing chamber.
- a pressure damper or pulsation damper 5 is connected to line 1 a .
- air pressure is able to be introduced into the mixing chamber via an air pressure line 24 having a pressure limiter 21 , a two-way valve 22 and a check valve 23 .
- An aerosol line 25 goes from mixing chamber 8 to catalytic converter 30 , which has an exhaust gas supply 29 on one side and an exhaust gas outlet 31 on the other side.
- Urea tank 1 is provided with a fluid level sensor 62 and a temperature sensor 61 .
- Temperature sensors 64 and 65 measure the temperature of the exhaust gas at the inlet and the outlet of catalytic converter 30 .
- a pressure sensor 63 is provided between two-way valve 22 and check valve 23 .
- a controller 40 is connected electrically both to sensors 61 to 65 and to metering valve 7 . Via a CAN data line 41 (CAN is short for “controlled area network”), controller 40 is connected to the voltage supply and to additional electronic components in the motor vehicle, especially to the engine control unit.
- CAN data line 41 CAN is short for “controlled area network”
- Metering valve 7 meters the required urea/water solution into mixing chamber 8 .
- an aerosol and a wall film are generated by the compressed air being applied to the urea/water solution which are introduced into catalytic converter 30 via aerosol line 25 .
- controller 40 records signals which are received by a superordinated engine control unit via CAN data line 39 as well as the signals from pressure, temperature and fluid level sensors 61 to 65 , which are known per se, and are not explained in greater detail here.
- Valve 22 regulates the pressure in the compressed air line. From the sensor data, controller 40 computes a urea metering quantity that is to be added to an exhaust gas flowing through catalytic converter 30 .
- the controller uses data on the engine operating state supplied from the engine control unit via data line 41 , as well as sensor data originating from the metering device and the catalytic converter.
- the pressure in mixing chamber 8 may vary as a function of the selected dimensions of line 25 and of the metering pipe reaching in to the exhaust gas tract, and of the geometry and the number of outlet openings on the metering pipe.
- the exhaust gas counterpressure also influences the pressure in the mixing chamber, for example, as a result of a particulate filter situated downstream from catalytic converter 30 . Such influences on the mixing chamber pressure may be dependent upon conditions of manufacturing, the application involved, the wear occurring or the process.
- hose line 12 ensures that, independently of these influences, the metering quantity provided by the controller is actually injected into the exhaust gas tract: for if an increased mixing chamber pressure is present at the relief valve via the hose line, this regulates the pressure in line 1 a to a higher value and to the extent that the difference of the pressures before and after the metering valve remain constant or that the ratio of the pressures before and after metering valve 7 remains constant.
- the metering device may also be used without the support of compressed air, i.e. without using components 20 to 24 and 63 .
- FIG. 2 shows an additional, alternative specific embodiment, in which the same components as in FIG. 1 are given the same reference numerals.
- relief valve 11 has no pneumatic connection connected to the mixing chamber via a line.
- controller 40 has a regulator 52 that is electrically connected to relief valve 11 via a line 51 , and it is integrated into the controller as software.
- a pressure sensor 70 detects the pressure in mixing chamber 8 and conducts its pressure signals on to regulator 52 .
- An adjustment of the metering quantity of urea/water solution can be made alternatively or in combination with electrical control of the relief valve by correction characteristics maps, stored in regulator 52 , for the variation of the metering valve control.
- Metering valve 7 is controlled by the control unit as soon as there is a requirement for reducing agent in the exhaust gas tract.
- the metering takes place in pulsed form, so that an on/off ratio can be defined, which is derived from the ratio of the time durations of closed valve states to open valve states during the time of the control.
- Regulator 52 is able to vary this on/off ratio as a function of the measured pressure prevailing in the mixing chamber.
- FIG. 3 shows an exemplary control algorithm for this.
- regulator 52 processes an on/off ratio value 80 proportional to the T, by a conversion unit 85 determining the setpoint pressure value in the mixing chamber that results from a currently present on/off ratio value (such as via a stored linear function).
- a currently present on/off ratio value such as via a stored linear function.
- mixing chamber actual value 86 is subtracted, which is reported to regulator 52 by pressure sensor 70 .
- the difference value is supplied to a correction value computing unit 88 , which, as a function of the difference value, determines a correction value for the on/off ratio.
- the stored correction characteristics curve required for this in a diagram in which the correction values are plotted along the ordinate and the difference values along the abscissa, has, for instance, the shape of a straight line going through the origin and having a negative slope, for difference values that are large in absolute value, the straight line going over into curve sections having a low slope in absolute value or a slope of zero.
- the correction value is added in summation node 83 to currently set on/off ratio value 80 , so that regulator 52 is able to set, via line 51 , a correcting on/off ratio 84 at relief valve 11 .
- FIG. 4 illustrates a metering device which, in modification of a system as shown in FIG. 1, has neither means for metering air nor a mixing chamber.
- the metering valve here given reference numeral 120 , is mounted directly on exhaust gas pipe 110 that leads to catalytic converter 30 , so that its opening penetrates directly into the exhaust gas tract.
- Pneumatic connection 13 of relief valve 11 is connected via a hose line 100 to exhaust gas pipe 110 .
- relief valve 11 sets the pressure in line 1 a as a function of the pressure prevailing after metering valve 120 , the pressure in exhaust gas pipe 110 .
- the solution may also be applied that uses a regulator 52 connected to a pressure sensor corresponding to FIG. 2, the pressure sensor measuring the pressure in exhaust gas pipe 110 .
- the guiding magnitude in controller 52 is then not the mixing chamber pressure, but rather the exhaust gas counterpressure prevailing in the exhaust gas pipe.
Abstract
A method and a device are proposed for metering a reducing agent, in which means are provided for supplying the reducing agent into a catalytic converter system via a line, for the removal of nitrogen oxides from the exhaust gases, particularly of a Diesel engine, at the end of the line a metering means, especially a metering valve, being situated, and means being provided for regulating the pressure of the reducing agent in the line; the means for regulating the pressure (11, 12, 13; 11, 52, 70; 11, 13, 100) and/or the metering means (7; 120) being able to interact with a pressure recording element (12; 70; 100) which records pressure changes on the output side of the metering means facing away from the line, so that the pressure changes influence the pressure regulation and the metering.
Description
- The present invention relates to a device and a method for metering a reducing agent, particularly of urea or a urea-water solution within the scope of a catalytic exhaust gas treatment, according to the species defined in the independent claims.
- In order to achieve a reduction in NOx components in exhaust gases, reduction catalysts were developed, particularly for Diesel engines, which are commonly subdivided into SCR catalysts (selective catalytic reduction) and storage catalysts. The so-called SCR catalysts reduce the nitrogen oxides by the use of a reducing agent, such as urea and/or ammonia, which is added to the exhaust gas, while the so-called storage catalysts are periodically regenerated, preferably using hydrocarbons of the internal combustion engine fuel that is carried along with it, in so-called exhaust gas rich phases.
- From German Patent Application DE 199 47 198 a device is known which meters in urea as the reducing agent, to remove nitrogen oxides in exhaust gases, such as from a Diesel engine. The metering is performed via a valve which releases urea doses, which are determined by the electrical control of the metering valve, its throttling cross section and the pressure difference prevailing at the throttle valve. The pressure prevailing before the valve is measured and held constant within a tolerance range.
- By contrast, the metering device according to the present invention and the method according to the present invention, having the characterizing features of the independent claims, have the advantage of making possible a compensation of manufacturing tolerances of the metering pipe and the metering line with respect to metering accuracy, of maintaining metering accuracy in the case of metering pipe outlet openings that are wearing and/or being stopped up, and of eliminating the influence of the exhaust gas counterpressure on the metering accuracy. Furthermore, no new plotting of a valve characteristic curve is required in the control unit, independently of the special design of the metering pipe and the metering line, so that time advantages come about in the application of the present invention.
- Advantageous further refinements and improvements of the method and the metering device described in the independent claims are made possible by the measures described in the dependent claims.
- It is particularly advantageous to set a constant pressure difference across the metering agent or rather, the metering valve, so that the difference in the pressure before and after the metering agent remains constant, independent of the metering quantity and independent of changing environmental conditions. Alternatively, in an advantageous manner, a constant pressure ratio across the metering agent or the metering valve can be set, so that the quotient of the reducing agent pressure upstream of the metering agent and the pressure downstream of the metering agent remains constant. This ensures a steady metering accuracy, so that both an ammonia breakthrough as a result of overmetering and a loss in nitrogen oxide conversion as a result of undermetering are certainly able to be avoided.
- Exemplary embodiments of the present invention are shown in the drawings and explained in greater detail in the following description. The figures show:
- FIG. 1 a metering system, connected together to a compressed air tank, a urea tank and a catalytic converter system, and
- FIG. 2 a corresponding system having an alternative metering device.
- FIG. 3 shows a control circuit diagram and
- FIG. 4 shows another alternative metering device.
- In FIG. 1, 1 denotes a urea tank, from which a urea/water solution is conveyed, via a
urea line 1 a having acheck valve 2 and afilter 3 designed as a filtering strainer, sucked in by ametering pump 4 that is controlled by the engine speed, and via acheck valve 6 to ametering valve 7 of amixing chamber 8. A quantity that is conveyed in excess is returned via arelief valve 11 and areturn line 1 b provided with acheck valve 2 a to the intake side of the pump. A relief valve is known, for example, from DE 198 05 070 C2. In FIG. 1 of DE 198 05 070 C2, such a valve is furnished with reference numeral 5 and is designated there as a diaphragm valve, since a diaphragm separates a first chamber conveying the fluid, whose pressure is to be controlled, from a second chamber having a spring. This spring presses on the diaphragm against an outlet opening that carries off excess quantities of fluid, which is situated in the first chamber. The second chamber (reference numeral 20 in DE 198 05 070 C2) is also able to have pressure applied to it via lines, so that the pressure that is to be set via the relief valve may be varied. This can be performed hydraulically, as described in DE 198 05 070 C2, or pneumatically. The connection of such a line to the relief valve is denoted in the present Application aspneumatic connection 13. Topneumatic connection 13 is connected aline 12, such as in the form of a hose, whose other end is connected to mixingchamber 8, so thatrelief valve 11 is able to control the pressure of the urea/water solution inline 1 a as a function of the pressure in the mixing chamber. Betweenrelief valve 11 andmetering pump 4, a pressure damper or pulsation damper 5 is connected toline 1 a. From anair pressure container 20, air pressure is able to be introduced into the mixing chamber via anair pressure line 24 having apressure limiter 21, a two-way valve 22 and acheck valve 23. Anaerosol line 25 goes frommixing chamber 8 tocatalytic converter 30, which has anexhaust gas supply 29 on one side and anexhaust gas outlet 31 on the other side. Ureatank 1 is provided with afluid level sensor 62 and atemperature sensor 61.Temperature sensors catalytic converter 30. Furthermore, apressure sensor 63 is provided between two-way valve 22 andcheck valve 23. Acontroller 40 is connected electrically both tosensors 61 to 65 and tometering valve 7. Via a CAN data line 41 (CAN is short for “controlled area network”),controller 40 is connected to the voltage supply and to additional electronic components in the motor vehicle, especially to the engine control unit. -
Metering valve 7 meters the required urea/water solution intomixing chamber 8. In the mixing chamber, an aerosol and a wall film are generated by the compressed air being applied to the urea/water solution which are introduced intocatalytic converter 30 viaaerosol line 25. In this context,controller 40 records signals which are received by a superordinated engine control unit via CAN data line 39 as well as the signals from pressure, temperature andfluid level sensors 61 to 65, which are known per se, and are not explained in greater detail here. Valve 22 regulates the pressure in the compressed air line. From the sensor data,controller 40 computes a urea metering quantity that is to be added to an exhaust gas flowing throughcatalytic converter 30. To do this, the controller uses data on the engine operating state supplied from the engine control unit viadata line 41, as well as sensor data originating from the metering device and the catalytic converter. Depending on its construction, the pressure inmixing chamber 8 may vary as a function of the selected dimensions ofline 25 and of the metering pipe reaching in to the exhaust gas tract, and of the geometry and the number of outlet openings on the metering pipe. In addition, the exhaust gas counterpressure also influences the pressure in the mixing chamber, for example, as a result of a particulate filter situated downstream fromcatalytic converter 30. Such influences on the mixing chamber pressure may be dependent upon conditions of manufacturing, the application involved, the wear occurring or the process. Now,hose line 12 ensures that, independently of these influences, the metering quantity provided by the controller is actually injected into the exhaust gas tract: for if an increased mixing chamber pressure is present at the relief valve via the hose line, this regulates the pressure inline 1 a to a higher value and to the extent that the difference of the pressures before and after the metering valve remain constant or that the ratio of the pressures before and after meteringvalve 7 remains constant. - Alternatively, the metering device may also be used without the support of compressed air, i.e. without using
components 20 to 24 and 63. - FIG. 2 shows an additional, alternative specific embodiment, in which the same components as in FIG. 1 are given the same reference numerals. In comparison to FIG. 1,
relief valve 11 has no pneumatic connection connected to the mixing chamber via a line. Instead,controller 40 has aregulator 52 that is electrically connected torelief valve 11 via aline 51, and it is integrated into the controller as software. Furthermore, apressure sensor 70 detects the pressure inmixing chamber 8 and conducts its pressure signals on toregulator 52. - An adjustment of the reducing agent pressure in
line 1 a takes place here by electrical control of the relief valve, at increased pressure in the mixing chamber the relief valve first returning an excess quantity of reducing agent intotank 1 vialine 1 b at a corresponding increased pressure inline 1 a, so that the pressure difference and the ratio of the pressures before and aftermetering valve 7 remain constant. - An adjustment of the metering quantity of urea/water solution can be made alternatively or in combination with electrical control of the relief valve by correction characteristics maps, stored in
regulator 52, for the variation of the metering valve control.Metering valve 7 is controlled by the control unit as soon as there is a requirement for reducing agent in the exhaust gas tract. In this connection, the metering takes place in pulsed form, so that an on/off ratio can be defined, which is derived from the ratio of the time durations of closed valve states to open valve states during the time of the control.Regulator 52 is able to vary this on/off ratio as a function of the measured pressure prevailing in the mixing chamber. If the pressure in the mixing chamber increases for any reason mentioned before, the proportion of the time of open valve states is increased, so that in spite of the increased counterpressure, the metering valve is able to inject the required metering quantity into the mixing chamber. FIG. 3 shows an exemplary control algorithm for this. According to FIG. 3,regulator 52 processes an on/offratio value 80 proportional to the T, by aconversion unit 85 determining the setpoint pressure value in the mixing chamber that results from a currently present on/off ratio value (such as via a stored linear function). As is symbolically represented insummation node 87, from this setpoint pressure value, mixing chamberactual value 86 is subtracted, which is reported toregulator 52 bypressure sensor 70. The difference value is supplied to a correctionvalue computing unit 88, which, as a function of the difference value, determines a correction value for the on/off ratio. The stored correction characteristics curve required for this, in a diagram in which the correction values are plotted along the ordinate and the difference values along the abscissa, has, for instance, the shape of a straight line going through the origin and having a negative slope, for difference values that are large in absolute value, the straight line going over into curve sections having a low slope in absolute value or a slope of zero. As symbolized by branchingnode 81 andline 82, the correction value is added insummation node 83 to currently set on/offratio value 80, so thatregulator 52 is able to set, vialine 51, a correcting on/offratio 84 atrelief valve 11. - FIG. 4 illustrates a metering device which, in modification of a system as shown in FIG. 1, has neither means for metering air nor a mixing chamber. The metering valve, here given
reference numeral 120, is mounted directly onexhaust gas pipe 110 that leads tocatalytic converter 30, so that its opening penetrates directly into the exhaust gas tract.Pneumatic connection 13 ofrelief valve 11 is connected via ahose line 100 to exhaustgas pipe 110. - Analogous to the system shown in FIG. 1,
relief valve 11 sets the pressure inline 1 a as a function of the pressure prevailing aftermetering valve 120, the pressure inexhaust gas pipe 110. - Alternatively to
hose connection 100, the solution may also be applied that uses aregulator 52 connected to a pressure sensor corresponding to FIG. 2, the pressure sensor measuring the pressure inexhaust gas pipe 110. The guiding magnitude incontroller 52 is then not the mixing chamber pressure, but rather the exhaust gas counterpressure prevailing in the exhaust gas pipe.
Claims (10)
1. A device for metering a reducing agent, particularly urea or a urea/water solution, having means for supplying the reducing agent into a catalytic converter system via a line for removing nitrogen oxides from the exhaust gases, especially of a Diesel engine, a metering means, particularly a metering valve, being situated at the end of the line, having means for regulating the pressure of the reducing agent in the line,
wherein the means for regulating the pressure (11, 12, 13; 11, 52, 70; 11, 13, 100) and/or the metering means (7; 120) are able to interact with a pressure recording element (12; 70; 100) which records pressure changes at the output side of the metering means facing away from the line, so that the pressure changes have an influence on the pressure regulation and the metering.
2. The device as recited in claim 1 ,
wherein the difference or the quotient of the value of the pressure in the line and the pressure on the output side of the metering means facing away from the line is kept constant.
3. The device as recited in one of the preceding claims,
wherein the means for regulating the pressure include a relief valve (11).
4. The device as recited in claim 3 ,
wherein the relief valve has a pneumatic connection (13); the pressure recording element has an additional line (12) connected to the relief valve;
and the line is connected to the pneumatic connection.
5. The device as recited in one of the preceding claims,
wherein the pressure recording element has a pressure sensor (70).
6. The device as recited in claim 5 ,
wherein the pressure sensor is connected to a regulator, especially to a regulator (52) integrated into a control unit (40) which is able to control the means for regulating the pressure and/or the metering means as a function of the pressure changes.
7. The device as recited in one of the preceding claims,
wherein the metered reducing agent supply goes into a mixing chamber (8) to form an aerosol, so that the aerosol is able to be introduced into the catalytic converter system (30) via an aerosol line (25).
8. The device as recited in claim 7 ,
wherein means (20, 21, 22, 23, 24, 63) are provided for metering an air supply into the mixing chamber (8).
9. The device as recited in one of claims 1 through 6,
wherein the metering means are mounted on an exhaust gas pipe that leads to the catalytic converter system, the output side of the metering means facing away from the line penetrating into the exhaust gas pipe.
10. A method for metering a reducing agent, particularly urea or a urea/water solution, the reducing agent being supplied in a metered manner to a catalytic converter system, while the pressure of the reducing agent is regulated, for the removal of nitrogen oxides from the exhaust gases, especially of a Diesel engine, with the aid of a metering means, particularly a metering valve, wherein the pressure changes are recorded at the side of the metering means facing the catalytic converter system and have an influence on the pressure regulation and/or the control of the metering means.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10127834.9 | 2001-06-08 | ||
DE10127834A DE10127834A1 (en) | 2001-06-08 | 2001-06-08 | Device for dosing a reducing agent, especially urea or a urea-water solution, comprises units for introducing the agent into a catalyst arrangement, a dosing valve arranged at the end |
PCT/DE2002/001800 WO2002101209A1 (en) | 2001-06-08 | 2002-05-18 | Device and method for metering a reductant for eliminating nitrogen oxide from exhaust gases |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040177606A1 true US20040177606A1 (en) | 2004-09-16 |
Family
ID=7687620
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/479,696 Abandoned US20040177606A1 (en) | 2001-06-08 | 2002-05-18 | Device and method for metering a reductant for eliminating nitrogen oxides from exhaust gases |
Country Status (6)
Country | Link |
---|---|
US (1) | US20040177606A1 (en) |
EP (1) | EP1399653B1 (en) |
JP (1) | JP2004529286A (en) |
KR (1) | KR20040030650A (en) |
DE (2) | DE10127834A1 (en) |
WO (1) | WO2002101209A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
DE10127834A1 (en) | 2002-12-12 |
EP1399653A1 (en) | 2004-03-24 |
KR20040030650A (en) | 2004-04-09 |
WO2002101209A1 (en) | 2002-12-19 |
JP2004529286A (en) | 2004-09-24 |
DE50204035D1 (en) | 2005-09-29 |
EP1399653B1 (en) | 2005-08-24 |
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AS | Assignment |
Owner name: ROBERT BOSCH GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SCHARSACK, CORD;REEL/FRAME:015285/0823 Effective date: 20040115 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |