WO2014102122A1 - Auxiliary cooling means for a dosing module in an exhaust treatment system - Google Patents

Auxiliary cooling means for a dosing module in an exhaust treatment system Download PDF

Info

Publication number
WO2014102122A1
WO2014102122A1 PCT/EP2013/077243 EP2013077243W WO2014102122A1 WO 2014102122 A1 WO2014102122 A1 WO 2014102122A1 EP 2013077243 W EP2013077243 W EP 2013077243W WO 2014102122 A1 WO2014102122 A1 WO 2014102122A1
Authority
WO
WIPO (PCT)
Prior art keywords
branch
dosing module
engine
fluid
pump
Prior art date
Application number
PCT/EP2013/077243
Other languages
French (fr)
Inventor
Ville UUSITALO
Original Assignee
Valtra Oy Ab
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 Valtra Oy Ab filed Critical Valtra Oy Ab
Publication of WO2014102122A1 publication Critical patent/WO2014102122A1/en

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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • 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
    • F01N2610/11—Adding substances to exhaust gases the substance or part of the dosing system being cooled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
    • F01P2005/105—Using two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/16—Outlet manifold
    • 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 exhaust treatment systems and in particular to the cooling of dosing modules used for the injection of additive in the exhaust stream.
  • SCR Selective Catalytic Reduction
  • the injection of the additive is carried out by a dosing module, many models of which are available from various manufacturers.
  • the dosing modules are often sensitive to temperature and so must be cooled during operation. This is especially important when fitted inside a confined space in the vicinity of a hot engine. Cooling is typically carried out by directing engine coolant via the dosing module, the coolant being circulated by the engine water pump.
  • an exhaust treatment system comprising an exhaust line connected to an emissions output of an internal combustion engine, the exhaust line including a dosing module for injecting additive into an exhaust stream conveyed by the exhaust line and a catalyst unit disposed downstream of the dosing module, the system further comprising cooling means for maintaining the temperature of the dosing module within an operating range, the cooling means comprising a fluid circuit which delivers cooling fluid to both the engine and the dosing module, a main fluid pump driven by the engine and an electrically driven auxiliary fluid pump which serves to force the cooling fluid around the fluid circuit to the dosing module, wherein the auxiliary pump is activated automatically when the engine is shut down.
  • the auxiliary pump is preferably located in the fluid circuit immediately upstream or downstream of the dosing module for ease of installation.
  • the dosing module and auxiliary pump may be located in a dedicated branch of the cooling circuit to avoid the auxiliary pump having to pump coolant through every component in the cooling system.
  • the fluid circuit should be arranged for both the main pump and the auxiliary pump to pump coolant through the dosing module.
  • the fluid circuit may comprise a first branch and a second branch parallel to the first branch, the main fluid pump driving fluid around both the first and second branches when the engine is running, the first branch including a heat exchanger, and the second branch including the dosing module and the auxiliary fluid pump.
  • the coolant is not propelled through the heat exchanger by the auxiliary pump thus reducing the demand on the latter.
  • system further comprises an expansion tank disposed in a third branch of the fluid circuit which is connected in parallel to the heat exchanger, wherein the second branch and third branch share a return line to the first branch.
  • expansion tank return line to also return the coolant from the dosing module reduces the number of components required.
  • the system further comprises a storage tank for the additive, the tank including a heat exchanger connected to the fluid circuit for cooling additive in the tank, wherein the tank's heat exchanger is connected in parallel to the dosing module and auxiliary fluid pump.
  • the auxiliary pump need not pump coolant through the additive tank and so a smaller pump can be employed.
  • FIG. 1 is a schematic diagram of a cooling system for an exhaust treatment system in accordance with a first embodiment of the invention.
  • FIG. 2 is a schematic diagram of a cooling system for an exhaust treatment system in accordance with a second embodiment of the invention.
  • an exhaust treatment system comprises a dosing module 12 which serves to inject a solution of urea into an exhaust stream of an internal combustion engine 14.
  • the other components of the exhaust treatment system are not illustrated and are not pertinent to the explanation of the invention.
  • the dosing module 12 is connected to a cooling system 10 which serves to extract heat from the dosing module 12 and thus maintain the temperature below the maximum recommended level.
  • the cooling system 10 comprises a fluid circuit which conveys coolant between components.
  • a first branch 21 (or loop) of the fluid circuit coolant is propelled by an engine water pump 16 around the loop through the sump of the engine 14 and a heat exchanger in the form of a radiator 18.
  • a thermostat 19 is included to divert coolant around the radiator 18 when the temperature of the fluid is below a threshold level.
  • a second branch 22 the dosing module 12 is connected in series with an electrically driven auxiliary pump 30.
  • the water pump 16 pumps coolant around the second branch 22 through the dosing module 12.
  • the auxiliary pump 30 Upon shut down of the engine, the auxiliary pump 30 is automatically energised and drives coolant around the second branch for a predetermined period of time or until the temperature of the dosing module 12 falls below a predetermined threshold.
  • the cooling system 10 further comprises an expansion tank 32 connected in a third branch 23 of the fluid circuit in parallel to the radiator 18.
  • the expansion tank 32 is known.
  • the second branch 22 shares a return line 22a with the third branch 23. Therefore, coolant returning from the expansion tank 32 is combined with coolant returning from the dosing module in a common pipe 22a connected to the input side of the water pump 16.
  • the fluid circuit further comprises a fourth branch 24 for the engine oil cooler 34 which comprises a heat exchanger connected in parallel with the radiator 18.
  • a fifth branch 25 conveys coolant (heated by the engine 14) to the roof 36 of the cab for heating the operator environment.
  • a sixth branch 26 includes a heat exchanger integrated into a urea storage tank 38 which serves to cool the contents of the tank 38.
  • a cooling system 50 comprises a dosing module 52 and electrically powered auxiliary pump 60 disposed in a branch 61 which is connected in the fluid circuit in parallel to the additive storage tank 38.
  • the remaining components are the same as described above.
  • the auxiliary pump 60 In response to shutting down of the engine 14, the auxiliary pump 60 is automatically energised to pump coolant around in a loop through the main water pump 18 and the engine 14.
  • the larger loop controlled by the auxiliary pump 60 circulates a greater volume of coolant compared to the system of Figure 1. Therefore, the cooling effect of the auxiliary pump 60 is greater.

Landscapes

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

Abstract

A cooling system (10; 50) for maintaining the temperature of an exhaust dosing module (12; 52) within an operating range comprises a fluid circuit which delivers cooling fluid to both an engine (14) and the dosing module (12; 52). An engine water pump (16) and an electrically driven auxiliary fluid pump (30; 60) each serve to force the cooling fluid around the fluid circuit to the dosing module. The auxiliary pump (30; 60) is activated automatically when the engine (14) is shut down.

Description

DESCRIPTION
AUXILIARY COOLING MEANS FOR A DOSING MODULE IN AN EXHAUST
TREATMENT SYSTEM
The invention relates to exhaust treatment systems and in particular to the cooling of dosing modules used for the injection of additive in the exhaust stream.
To meet the ever-stricter demands from emission regulations more and more vehicle manufacturers are treating the exhaust emissions of internal combustion engines before exhausting them to the atmosphere. One well-established method of exhaust treatment is Selective Catalytic Reduction (SCR) which involves the injection of a urea-based additive into the exhaust stream before being passed through a catalyst unit to remove the harmful gasses through chemical reaction.
The injection of the additive is carried out by a dosing module, many models of which are available from various manufacturers. The dosing modules are often sensitive to temperature and so must be cooled during operation. This is especially important when fitted inside a confined space in the vicinity of a hot engine. Cooling is typically carried out by directing engine coolant via the dosing module, the coolant being circulated by the engine water pump.
A problem arises immediately after when the engine is shut down, especially when operating in a hot environment and/or after a long duration of operation. The engine water pump, driven by the engine, ceases to propel engine coolant through the dosing module.
According to the invention there is provided an exhaust treatment system comprising an exhaust line connected to an emissions output of an internal combustion engine, the exhaust line including a dosing module for injecting additive into an exhaust stream conveyed by the exhaust line and a catalyst unit disposed downstream of the dosing module, the system further comprising cooling means for maintaining the temperature of the dosing module within an operating range, the cooling means comprising a fluid circuit which delivers cooling fluid to both the engine and the dosing module, a main fluid pump driven by the engine and an electrically driven auxiliary fluid pump which serves to force the cooling fluid around the fluid circuit to the dosing module, wherein the auxiliary pump is activated automatically when the engine is shut down. By incorporating an auxiliary pump into the fluid circuit the coolant can be propelled through the dosing module even after the engine has been shut down thus maintaining the temperature of the dosing module within the required parameters and avoiding irreparable damage.
The solution presented is both cheap and simple to implement with minimal changes required to the existing fluid circuit and associated components.
The auxiliary pump is preferably located in the fluid circuit immediately upstream or downstream of the dosing module for ease of installation. Depending on the layout of the existing fluid circuit, the dosing module and auxiliary pump may be located in a dedicated branch of the cooling circuit to avoid the auxiliary pump having to pump coolant through every component in the cooling system. In any case, the fluid circuit should be arranged for both the main pump and the auxiliary pump to pump coolant through the dosing module.
The fluid circuit may comprise a first branch and a second branch parallel to the first branch, the main fluid pump driving fluid around both the first and second branches when the engine is running, the first branch including a heat exchanger, and the second branch including the dosing module and the auxiliary fluid pump. In this case, the coolant is not propelled through the heat exchanger by the auxiliary pump thus reducing the demand on the latter.
In one arrangement the system further comprises an expansion tank disposed in a third branch of the fluid circuit which is connected in parallel to the heat exchanger, wherein the second branch and third branch share a return line to the first branch. Advantageously, the utilisation of the expansion tank return line to also return the coolant from the dosing module reduces the number of components required.
In a second arrangement the system further comprises a storage tank for the additive, the tank including a heat exchanger connected to the fluid circuit for cooling additive in the tank, wherein the tank's heat exchanger is connected in parallel to the dosing module and auxiliary fluid pump. Advantageously, in this arrangement, the auxiliary pump need not pump coolant through the additive tank and so a smaller pump can be employed. Specific embodiments of the invention will now be described with reference to the appended drawings in which:-
Figure 1 is a schematic diagram of a cooling system for an exhaust treatment system in accordance with a first embodiment of the invention; and,
Figure 2 is a schematic diagram of a cooling system for an exhaust treatment system in accordance with a second embodiment of the invention.
With reference to Figure 1 , an exhaust treatment system comprises a dosing module 12 which serves to inject a solution of urea into an exhaust stream of an internal combustion engine 14. The other components of the exhaust treatment system are not illustrated and are not pertinent to the explanation of the invention.
The dosing module 12 is connected to a cooling system 10 which serves to extract heat from the dosing module 12 and thus maintain the temperature below the maximum recommended level.
The cooling system 10 comprises a fluid circuit which conveys coolant between components. In a first branch 21 (or loop) of the fluid circuit coolant is propelled by an engine water pump 16 around the loop through the sump of the engine 14 and a heat exchanger in the form of a radiator 18. A thermostat 19 is included to divert coolant around the radiator 18 when the temperature of the fluid is below a threshold level. This arrangement is known today on the N-series range of agricultural tractors branded Valtra (registered trade mark).
Further branches of the fluid circuit supply coolant to other components. In a second branch 22 the dosing module 12 is connected in series with an electrically driven auxiliary pump 30. In normal operation the water pump 16 pumps coolant around the second branch 22 through the dosing module 12.
Upon shut down of the engine, the auxiliary pump 30 is automatically energised and drives coolant around the second branch for a predetermined period of time or until the temperature of the dosing module 12 falls below a predetermined threshold.
The cooling system 10 further comprises an expansion tank 32 connected in a third branch 23 of the fluid circuit in parallel to the radiator 18. The expansion tank 32 is known. However, the second branch 22 shares a return line 22a with the third branch 23. Therefore, coolant returning from the expansion tank 32 is combined with coolant returning from the dosing module in a common pipe 22a connected to the input side of the water pump 16.
For completeness, the fluid circuit further comprises a fourth branch 24 for the engine oil cooler 34 which comprises a heat exchanger connected in parallel with the radiator 18. A fifth branch 25 conveys coolant (heated by the engine 14) to the roof 36 of the cab for heating the operator environment. A sixth branch 26 includes a heat exchanger integrated into a urea storage tank 38 which serves to cool the contents of the tank 38.
In a second embodiment illustrated in Figure 2, a cooling system 50 comprises a dosing module 52 and electrically powered auxiliary pump 60 disposed in a branch 61 which is connected in the fluid circuit in parallel to the additive storage tank 38. The remaining components are the same as described above.
In response to shutting down of the engine 14, the auxiliary pump 60 is automatically energised to pump coolant around in a loop through the main water pump 18 and the engine 14. The larger loop controlled by the auxiliary pump 60 circulates a greater volume of coolant compared to the system of Figure 1. Therefore, the cooling effect of the auxiliary pump 60 is greater.

Claims

1. An exhaust treatment system comprising an exhaust line connected to an emissions output of an interna! combustion engine, the exhaust line including a dosing module for injecting additive into an exhaust stream conveyed by the exhaust line and a catalyst unit disposed downstream of the dosing module, the system further comprising cooling means for maintaining the temperature of the dosing module within an operating range, the cooling means comprising a fluid circuit which delivers cooling fluid to both the engine and the dosing module, a main fluid pump driven by the engine and an electrically driven auxiliary fluid pump which serves to force the cooling fluid around the fluid circuit to the dosing module, wherein the auxiliary pump is activated automatically when the engine is shut down.
2. A system according to Claim 1 , wherein the fluid circuit comprises a first branch and a second branch parallel to the first branch, the main fluid pump driving fluid around both the first and second branches when the engine is running, the first branch including the engine and a heat exchanger, and the second branch including the dosing module and the auxiliary fluid pump.
3. A system according to Claim 2, further comprising an expansion tank disposed in a third branch of the fluid circuit which is connected in parallel to the heat exchanger, wherein the second branch and third branch share a return line to the first branch.
4. A system according to Claim 2, further comprising a storage tank for the additive, the tank including a heat exchanger connected to the fluid circuit for cooling additive in the tank, wherein the tank's heat exchanger is connected in parallel to the dosing module and auxiliary fluid pump.
PCT/EP2013/077243 2012-12-24 2013-12-18 Auxiliary cooling means for a dosing module in an exhaust treatment system WO2014102122A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1223357.3A GB201223357D0 (en) 2012-12-24 2012-12-24 Auxiliary cooling means for a dosing mocule in an exhaust treatment system
GB1223357.3 2012-12-24

Publications (1)

Publication Number Publication Date
WO2014102122A1 true WO2014102122A1 (en) 2014-07-03

Family

ID=47682566

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2013/077243 WO2014102122A1 (en) 2012-12-24 2013-12-18 Auxiliary cooling means for a dosing module in an exhaust treatment system

Country Status (2)

Country Link
GB (1) GB201223357D0 (en)
WO (1) WO2014102122A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014003580A1 (en) * 2014-03-11 2015-09-17 Daimler Ag Cooling arrangement and method for cooling a metering device
EP2998536A1 (en) * 2014-09-18 2016-03-23 Volvo Car Corporation An arrangement and a control method of an engine cooling system
US9518499B2 (en) * 2015-01-21 2016-12-13 Deere & Company DEF injector cooling system and method
WO2021084399A1 (en) 2019-10-31 2021-05-06 Agco International Gmbh Exhaust after treatment cooling system
AU2022200864B2 (en) * 2021-02-19 2023-12-21 Kabushiki Kaisha Toyota Jidoshokki Cooling system and method for controlling cooling system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0996212A (en) * 1995-10-03 1997-04-08 Mitsubishi Motors Corp Exhaust gas purifier for diesel engine
EP2192280A1 (en) * 2008-12-01 2010-06-02 International Engine Intellectual Property LLC Thermal management of urea dosing components in an engine exhaust after-treatment system
US20100242439A1 (en) * 2007-10-19 2010-09-30 Wataru Domon Control unit and control method for reductant supply device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0996212A (en) * 1995-10-03 1997-04-08 Mitsubishi Motors Corp Exhaust gas purifier for diesel engine
US20100242439A1 (en) * 2007-10-19 2010-09-30 Wataru Domon Control unit and control method for reductant supply device
EP2192280A1 (en) * 2008-12-01 2010-06-02 International Engine Intellectual Property LLC Thermal management of urea dosing components in an engine exhaust after-treatment system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014003580A1 (en) * 2014-03-11 2015-09-17 Daimler Ag Cooling arrangement and method for cooling a metering device
EP2998536A1 (en) * 2014-09-18 2016-03-23 Volvo Car Corporation An arrangement and a control method of an engine cooling system
US9797295B2 (en) 2014-09-18 2017-10-24 Volvo Car Corporation Arrangement and a control method of an engine cooling system
US9518499B2 (en) * 2015-01-21 2016-12-13 Deere & Company DEF injector cooling system and method
WO2021084399A1 (en) 2019-10-31 2021-05-06 Agco International Gmbh Exhaust after treatment cooling system
AU2022200864B2 (en) * 2021-02-19 2023-12-21 Kabushiki Kaisha Toyota Jidoshokki Cooling system and method for controlling cooling system

Also Published As

Publication number Publication date
GB201223357D0 (en) 2013-02-06

Similar Documents

Publication Publication Date Title
US20140260199A1 (en) System and Method for Post-Shutdown Temperature Management and Purge
WO2014102122A1 (en) Auxiliary cooling means for a dosing module in an exhaust treatment system
US8122710B2 (en) Thermal management of urea dosing components in an engine exhaust after-treatment system
US8234854B2 (en) System and method for heating a reducing agent associated with a reducing agent distribution system
US8424777B2 (en) Reducing agent heating system
CN102482982B (en) Control device for variable water pump
RU2546882C2 (en) Method of air removal proportioning system in scr-system and to scr-system
EP2065578A1 (en) Heating system for chemical used in exhaust purification system
US20130014496A1 (en) Cooling system for engine aftertreatment system
US20160123204A1 (en) Control apparatus and control method for reducing agent supply apparatus
US20130104527A1 (en) Method and device pertaining to cooling of dosing units of scr systems
JP2009228616A (en) Reducer feeding device and cooling water circulation control device
US10287947B2 (en) Selective catalyst reduction system and method of controlling temperature of reducing agent injection module
CN105649734B (en) System and control method for cooling vehicle SCR system
US10364726B2 (en) Method for heating an operating agent, and an operating agent heating system
US9523299B2 (en) Method and device pertaining to cooling of dosing units of SCR systems
US10975749B2 (en) Systems and methods for heating reductant
CN209764395U (en) High-temperature-resistant detection device for urea nozzle
US20180252137A1 (en) Method for heating an operating agent, as well as reservoir heating system and an operating agent heating system
KR20160124580A (en) Pressurized type coolant circulation system for a vehicle
KR20150064472A (en) Method of Dosing Module Prevented Heat Injury and Urea Exhaust Purification System with Controller therefor
JP2015017576A (en) Reducer feeding device
JPWO2014156354A1 (en) Exhaust gas purification device for internal combustion engine
JP2018066326A (en) Urea water injection control device
WO2021152491A1 (en) Improved urea tank system

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13811500

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13811500

Country of ref document: EP

Kind code of ref document: A1