GB2478714A - Vehicle that heats reducing agent tank using microwaves - Google Patents

Vehicle that heats reducing agent tank using microwaves Download PDF

Info

Publication number
GB2478714A
GB2478714A GB1004252A GB201004252A GB2478714A GB 2478714 A GB2478714 A GB 2478714A GB 1004252 A GB1004252 A GB 1004252A GB 201004252 A GB201004252 A GB 201004252A GB 2478714 A GB2478714 A GB 2478714A
Authority
GB
United Kingdom
Prior art keywords
tank
microwave
vehicle
fluid
emission
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Withdrawn
Application number
GB1004252A
Other versions
GB201004252D0 (en
Inventor
Michael A Potter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GM Global Technology Operations LLC
Original Assignee
GM Global Technology Operations LLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by GM Global Technology Operations LLC filed Critical GM Global Technology Operations LLC
Priority to GB1004252A priority Critical patent/GB2478714A/en
Publication of GB201004252D0 publication Critical patent/GB201004252D0/en
Publication of GB2478714A publication Critical patent/GB2478714A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • F01N3/202—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means using microwaves
    • 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
    • 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
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • 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
    • F01N2610/1486—Means to prevent the substance from freezing
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

A vehicle having an internal combustion engine and an exhaust gas aftertreatment system with an associated tank 15, such as a reducing agent tank for an SCR system, where the contents 16 of the tank are heated using a microwave emitter 12. Preferably the tank is fluidly connected to the aftertreatment system. The vehicle may also comprise a microwave detector 13, integral with the emitter, which is used to estimate the quantity of fluid present in the tank based on the emitted microwave. The external surface of the tank may be provided with a microwave shielding.

Description

VEHICLE HAVING A HEATING DEVICE FOR EMISSION REDUCTANT FLUIDS
TEHNICWJ FIELD
The present invention relates to a vehicle having a heating device for emission reductant fluids.
BACKOUND
Selective Catalytic Reduction systems (SCR) are known as an efficient way to reduce nitrogen oxides (NOr) emissions of internal combustion engine systems.
The SCR is a catalytic device in which the nitrogen oxides (NOr) contained in the exhaust gas are reduced into diatonic nitrogen (N2) and water (H20), with the aid of a gaseous reducing agent, typically arrTnonia (NH3) that can be obtained by urea (CH4N2O) thermo-hydrolysis and that is absorbed inside the catalyst. Typically urea, or in general any suitable Diesel Emission Fluid (DEF) containing urea, is injected in the exhaust line and mixed with the exhaust gas upstream the SCR.
Known SCR systems may comprise a Diesel Emission Fluid (DEF) tank provided with a DEF pressure regulator, used to maintain DEF pressure at a certain setpoint to maximize injection spray efficiency. The DEF tank is connected downstream to a filter and a pump.
Regulations in some regions require that the aftertreatment maintain its function even below the freezing point of the emission fluid. As a result, it is necessary to provide heating of the fluid in the tank to thaw the fluid.
Current technology uses traditional resistive electric heating to thaw the emission fluid.
Furthermore, regulations for emission systems using fluid base emission reduction require a robust means of measuring the quantity of fluid in the vehicle reductant tank.
Since regulations mandate that low fluid level will result in power reduction and/or imaobilizing the vehicle, it is desirable to provide the driver an accurate and continuous measurement of the level of fluid available.
The fact that emission reductant fluid freezes prevents the use of normal level measurement methods. Current strategy only provides discrete measurement at a limited number of fluid levels and may require for example three measurement devices, namely three different fluid level sensors. This method of measurement is complex, costly and limits the resolution of the information that can be provided the driver.
An object of an embodiment of the invention is to provide enhancements to the technology used in aftertreatment systems using emission reductant fluids, like urea SCR systems or similar.
Another object of the present invention is to meet these goals by means of a simple, rational and inexpensive solution.
These objects are achieved by a vehicle having the features recited in the independent claim.
The dependent claims delineate preferred and/or especially advantageous aspects of the various embodiments.
SUMYRY
An embodiment of the invention provides for a vehicle having an internal combustion engine and an exhaust gas aftertreatment system having an associated tank, the vehicle comprising a microwave emitter arranged to heat the content of said tank.
This embodiment has the advantage of providing an effective way to thaw or, in general, to heat the content of the tank associated to the aftertreatment system.
A further embodiment provides for a vehicle wherein said tank is fluidly connected to said aftertreatment system.
This embodiment has the advantage of modulating the energy required to heat the fluid that flows into the aftertreatment system in a sufficient manner in order to thaw the fluid or avoid its freezing.
Another embodiment provides for a vehicle that further comprises a microwave detector suitable to detect a microwave signal in response to an emitted microwave wave, said response being indicative of the quantity of fluid present in the tank.
This embodiment has the advantage of measuring the level of the fluid in the tank without the need of level sensors. Also this measure is insensitive to vehicle motion.
A still further embodiment provides for a vehicle wherein said microwave detector is integral with said microwave emitter This embodiment has the advantage of a compact arrangement of components.
Another embodiment provides for vehicle wherein the external surface of said tank is provided with a microwave shielding.
This embodiment has the advantage of avoiding dispersion of microwaves for protection of passengers of the vehicle and of optimizing energy consumption.
BRIEF DESCRIPTION OF THE DRAWINGS
The embodiments of the invention will now be described, by way of example, with reference to the accompanying drawing, in which: Figure 1 is a schematic representation of an embodiment of the invention included in a vehicle.
DESCRIPTION OF THE PREFERRED 1BCDIMENT
A preferred embodiment of the present invention is now described with reference to Figure 1 whereby a tank 15 for storing an emission reductant fluid 16 is depicted, the tank 15 having a fill port 18 for refilling and an outtake line for the fluid that comprises a filter 17 and a pump 14.
According to an embodiment hereby described, a microwave source 11 is provided, said microwave source being connected to a microwave emitter 12 suitable to emit microwave energy into the tank 15 for the emission reductant fluid herein stored.
The emission reductant fluid is therefore heated in order to reach or keep a desired temperature.
In the case of frozen emission fluid, microwave energy is modulated to heat fluid sufficiently to thaw the fluid. Since the water based emission fluids respond well to microwave energy, the microwave emission promotes thawing in tanks of various shapes.
Suitable electronics and controls supports initiation of management of the microwave device, said electronics maybe incorporated into the Electronic Control Unit (ECU) of the vehicle.
Also, suitable shielding of the surface of the tank may be provided for passenger protection from microwave radiation.
The fluid temporarily stored in tank 15 is subjected to an emission of a quantity of microwave radiation suitable to reach or keep a desired temperature for the fluid.
A further step may provide for temperature sensing in order to dictate activation and energy emission of the microwave device.
In general, said microwave emission is calculated in order to permit the fluid to reach or to keep a desired temperature. If the fluid is frozen, the device allows to thaw said emission reductant fluid.
Furthermore a device according to an embodiment of the invention may comprise a microwave detector 13 suitable to detect the microwave response generated by the quantity of fluid present in the tank when the fluid is subjected to an emission of microwaves.
The microwaves emitted are reflected by the fluid and by means of this reflections the quantity of the fluid in the tank is determined.
Specifically, in the case of quantity measurement, the microwave energy is applied periodically to create a energy response that can be detected and used to infer the mass of the fluid in the tank.
This measurement can be applied continuously to the fluid in the tank leading to an improvement with respect to the prior art that provided only discrete measurements.
In general however either continuous or periodic activation of the microwave device could be used to produce electromagnetic energy that, in turn would produce a detectible response correlated to the mass of the fluid in the reservoir. Since the measurement is based on the mass response to the electromagnetic energy, measurements can be made irrespective of the state of the fluid or of the motion of the vehicle.
Preferably, the microwave detector 13 is integral with the microwave emitter 12.
The embodiments described have several important advantages and benefits.
First a new and effective approach for thawing frozen emission reductant fluid or, in general, for heating them is provided enhancing the capabilities of the engine system as a whole.
A substantially improved measurement of fluid quantity is also provided.
A single system, namely the microwave system, replaces two systems used in current technology, namely three level sensors and a resistive heater.
Also, an enhanced On Board Diagnostic (OBD) capability is provided thanks to the erribodiments described which provide an high resolution fluid consumption measure that is insensitive to vehicle motion, because it senses fluid mass rather than fluid level.
While at least one exemplary embodiment has been presented in the foregoing summary and detailed description, it should be appreciated that a vast number of variations exist. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration in any way. Rather, the foregoing sumary and detailed description will provide those skilled in the art with a convenient road map for implementing at least one exemplary embodiment, it being understood that various changes may be made in the function and arrangement of elements described in an exemplary embodiment without departing from the scope as set forth in the appended claims and their legal equivalents.
REFERENCE NUMBERS
11 microwave source 12 microwave emitter 13 microwave receiver l4pump tank 16 emission fluid 17 filter 18 fill port cis

Claims (6)

1. Vehicle having an internal combustion engine and an exhaust gas aftertreatment system having an associated tank, the vehicle comprising a microwave emitter arranged to heat the content of said tank.
2. Vehicle according to claim 1, wherein said tank is fluidly connected to said aftertreatment system.
3. Vehicle according to claim 2, wherein said vehicle further comprises a microwave detector suitable to detect a microwave signal in response to an emitted microwave wave, said response being indicative of the quantity of fluid present in the tank.
4. Vehicle according to claim 3, wherein said microwave detector is integral with said microwave emitter
5. Vehicle according to claim 1, wherein the external surface of said tank is provided with a microwave shielding.
6. Heating device for a vehicle, the vehicle having an internal combustion engine and an exhaust gas aftertreatment system having an associated tank, the heating device comprising a microwave emitter arranged to heat the content of said tank.
GB1004252A 2010-03-15 2010-03-15 Vehicle that heats reducing agent tank using microwaves Withdrawn GB2478714A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1004252A GB2478714A (en) 2010-03-15 2010-03-15 Vehicle that heats reducing agent tank using microwaves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1004252A GB2478714A (en) 2010-03-15 2010-03-15 Vehicle that heats reducing agent tank using microwaves

Publications (2)

Publication Number Publication Date
GB201004252D0 GB201004252D0 (en) 2010-04-28
GB2478714A true GB2478714A (en) 2011-09-21

Family

ID=42261570

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1004252A Withdrawn GB2478714A (en) 2010-03-15 2010-03-15 Vehicle that heats reducing agent tank using microwaves

Country Status (1)

Country Link
GB (1) GB2478714A (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19510804A1 (en) * 1995-03-24 1996-09-26 Dornier Gmbh Reduction of nitrogen oxide(s) in vehicle exhaust gas
DE20021400U1 (en) * 2000-12-18 2001-03-22 Purem Abgassysteme Gmbh & Co Exhaust gas purification system for the denitrification of exhaust gases from an internal combustion engine on an SCR catalytic converter
US20010042378A1 (en) * 1995-09-20 2001-11-22 Pfister Dennis M. Controlled production of ammonia
US6969492B1 (en) * 1999-05-19 2005-11-29 Daimlerchrysler Ag Exhaust-gas cleaning system with nitrogen oxide reduction and with the addition of reducing agent
EP1647324A2 (en) * 2004-10-16 2006-04-19 Robert Bosch Gmbh Improved preparation of agents for NOx reduction
WO2007095955A1 (en) * 2006-02-27 2007-08-30 Amminex A/S A method of storing and delivering ammonia and the use of electromagnetic radiation for desorption of ammonia from a chemical complex
DE102008015599A1 (en) * 2008-03-26 2009-10-01 Robert Bosch Gmbh Fluid tank for receiving pollutant reducing fluid medium for reducing pollutants in exhaust gases, comprises defrosting device, which is provided for defrosting frozen pollutant reducing fluid medium
US20090301064A1 (en) * 2008-06-05 2009-12-10 Eugen Maier Urea pump assembly for an exhaust gas treatment system
JP2010019079A (en) * 2008-07-08 2010-01-28 Toyota Industries Corp Exhaust emission control device
EP2172629A1 (en) * 2008-10-01 2010-04-07 Delphi Technologies, Inc. Apparatus and method for maintaining a urea solution in a liquid state for treatment of diesel exhaust

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19510804A1 (en) * 1995-03-24 1996-09-26 Dornier Gmbh Reduction of nitrogen oxide(s) in vehicle exhaust gas
US20010042378A1 (en) * 1995-09-20 2001-11-22 Pfister Dennis M. Controlled production of ammonia
US6969492B1 (en) * 1999-05-19 2005-11-29 Daimlerchrysler Ag Exhaust-gas cleaning system with nitrogen oxide reduction and with the addition of reducing agent
DE20021400U1 (en) * 2000-12-18 2001-03-22 Purem Abgassysteme Gmbh & Co Exhaust gas purification system for the denitrification of exhaust gases from an internal combustion engine on an SCR catalytic converter
EP1647324A2 (en) * 2004-10-16 2006-04-19 Robert Bosch Gmbh Improved preparation of agents for NOx reduction
WO2007095955A1 (en) * 2006-02-27 2007-08-30 Amminex A/S A method of storing and delivering ammonia and the use of electromagnetic radiation for desorption of ammonia from a chemical complex
DE102008015599A1 (en) * 2008-03-26 2009-10-01 Robert Bosch Gmbh Fluid tank for receiving pollutant reducing fluid medium for reducing pollutants in exhaust gases, comprises defrosting device, which is provided for defrosting frozen pollutant reducing fluid medium
US20090301064A1 (en) * 2008-06-05 2009-12-10 Eugen Maier Urea pump assembly for an exhaust gas treatment system
JP2010019079A (en) * 2008-07-08 2010-01-28 Toyota Industries Corp Exhaust emission control device
EP2172629A1 (en) * 2008-10-01 2010-04-07 Delphi Technologies, Inc. Apparatus and method for maintaining a urea solution in a liquid state for treatment of diesel exhaust

Also Published As

Publication number Publication date
GB201004252D0 (en) 2010-04-28

Similar Documents

Publication Publication Date Title
US7954312B2 (en) Approach for detecting reductant availability and make-up
US8474248B2 (en) Model based method for selective catalyst reducer urea dosing strategy
EP1830040B1 (en) Engine exhaust purification apparatus
US8234854B2 (en) System and method for heating a reducing agent associated with a reducing agent distribution system
US6925796B2 (en) Diagnosis of a urea SCR catalytic system
US9556774B2 (en) Conveying unit for a liquid additive for exhaust gas after-treatment, tank for storing liquid additive, motor vehicle having the conveying unit and method for determining a liquid additive quantity in a tank
CN102209839B (en) Method for selective catalytic reduction of nitrogen oxides in exhaust gas of internal combustion engines
US8495868B2 (en) Control strategy for heated fluid lines
CN108691620B (en) Exhaust treatment system including ammonia storage control system
CN102691551A (en) Method for correcting an estimate of nh3 stored within a selective catalyst reduction system
WO2010073791A1 (en) Exhaust purifying device and liquid level measuring device
CN109844465B (en) Method and system for determining the amount of liquid in a tank
US20150096285A1 (en) System, apparatus, and methods for performing a quality diagnostic of an aqueous urea solution
US20150016485A1 (en) Method of determining the thermal state of a substance in cold condition
CN103806995A (en) Ammonia slip detection
US20140157879A1 (en) Method and device for testing a liquid
JP2004156614A (en) System and method for aftertreatment of engine exhaust gas
CN105229284A (en) Motor NOx model
US9279354B2 (en) Control unit for urea-water adding device
US11359527B2 (en) Method and system for control of an activation of at least one liquid sensitive sensor
GB2478714A (en) Vehicle that heats reducing agent tank using microwaves
US9228467B2 (en) Urea injection controller for a motorized system
EP2728135A2 (en) Ammonia flow control
US20130160521A1 (en) System and method of generating selective catalyst reduction dosing estimate for a diesel engine
US20180142594A1 (en) Method for operating a reagent dosing system, device for carrying out the method, control unit program, and control unit program product

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)