WO2013043291A1 - Régulation de pression par l'intermédiaire d'une commande de pompe d'un système d'échappement - Google Patents

Régulation de pression par l'intermédiaire d'une commande de pompe d'un système d'échappement Download PDF

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Publication number
WO2013043291A1
WO2013043291A1 PCT/US2012/051651 US2012051651W WO2013043291A1 WO 2013043291 A1 WO2013043291 A1 WO 2013043291A1 US 2012051651 W US2012051651 W US 2012051651W WO 2013043291 A1 WO2013043291 A1 WO 2013043291A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
fluid
supply line
control system
pressure
Prior art date
Application number
PCT/US2012/051651
Other languages
English (en)
Inventor
Tony Parrish
Ii Wilbur H. Crawley
Original Assignee
Faurecia Emissions Control Technologies, Usa, 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 Faurecia Emissions Control Technologies, Usa, Llc filed Critical Faurecia Emissions Control Technologies, Usa, Llc
Publication of WO2013043291A1 publication Critical patent/WO2013043291A1/fr

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
    • 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]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • F01N2610/1433—Pumps
    • F01N2610/144—Control thereof
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1808—Pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the subject invention relates to a control system to supply fluid to an exhaust component, and more particularly relates to a control system that adjusts pump flow rate to maintain a desired pressure in a supply line associated with the exhaust component.
  • Vehicle exhaust systems can include a supply system that is configured to supply fluid, such as diesel fuel or urea for example, to an exhaust gas stream within an exhaust component.
  • the supplied fluid is utilized within the exhaust component to initiate a desired reaction, or the fluid can be ignited or combusted by the hot exhaust gases to further increase the temperature within the exhaust component as needed.
  • Control systems for supplying the fluid utilize a pump to deliver the fluid to the exhaust component.
  • a flow regulating valve is positioned downstream of a pump outlet to deliver the desired amount of fluid to the exhaust component.
  • a pressure regulating valve is positioned in a return flow path to the fluid supply. The pressure regulating valve opens when system pressure is too high, allowing fluid to return to the supply.
  • a control system for a pump includes a pump having an inlet port and an outlet port, a fluid supply in fluid communication with the inlet port, and a supply line in fluid communication with the outlet port.
  • the supply line is configured to deliver fluid to an exhaust component.
  • a controller is configured to adjust pump flow rate to maintain a desired pressure in the supply line.
  • a restriction is utilized in a return flow path from the supply line.
  • the restriction comprises a fixed restriction having an opening defined by a fixed size. Fluid flows through the restriction any time the pump is active.
  • a pressure sensor measures pressure in the supply line and communicates this measured pressure to the controller.
  • the controller adjusts the pump flow rate based on the measured pressure.
  • Figure 1 is a schematic view of a control system for a pump in a vehicle exhaust system.
  • Figure 2 is a schematic view of one example of a restriction used in the control system of Figure 1.
  • a vehicle exhaust system 10 is used to remove particulates from exhaust gases generated by an internal combustion engine 12.
  • the vehicle exhaust system 10 is comprised of various combinations of exhaust components 14 as known.
  • the exhaust system 10 includes one or more exhaust components 14 that utilize a fluid supply system 16. Fluid is supplied to an exhaust gas stream in the exhaust component 14 to produce a desired effect within the exhaust gas.
  • an injector 18 is used to supply fluid to the exhaust component 14.
  • the fluid is supplied to the exhaust stream to initiate a desired reaction.
  • the exhaust component 14 may comprise a selective catalytic reduction (SCR) component that is supplied with a urea-based fluid to reduce NOx emissions.
  • the fluid is supplied to the exhaust stream for the purpose of increasing a temperature of the exhaust stream.
  • the exhaust component 14 may comprise a diesel particulate filter (DPF) that is supplied with fuel for regeneration purposes.
  • DPF diesel particulate filter
  • a control system 20 is used to meter the amount of fluid supplied to the exhaust system 10.
  • the control system 20 and fluid supply system 16 can be used with any type of exhaust component that would utilize a supply of fluid to produce a desired effect within the exhaust gas stream.
  • the fluid supply system 16 includes a pump 22 having an inlet port 24 at a suction side and an outlet port 26 at a pressure side.
  • a fluid supply source 28 is in fluid communication with the inlet port 24.
  • the fluid supply source 28 can be a separate dedicated supply source, or could be an existing fluid supply found within the vehicle. Examples of fluids for the fluid supply source 28 would be diesel fuel or urea; however, other types of fluids could also be used.
  • a supply line 30 is in fluid communication with the outlet port 26 and is configured to deliver fluid to one or more exhaust components 14.
  • the control system 20 is configured to adjust a pump flow rate to maintain a desired pressure in the supply line 30.
  • a return flow path 32 is configured to return fluid from the supply line 30 to the pump inlet port 24.
  • a restriction 34 is positioned within the return flow path 32.
  • the restriction 34 is positioned upstream of the fluid supply source 28 and returns fluid to an inlet 36 to the supply source 28.
  • the restriction 34 limits the flow rate of the fluid, which results in a higher pressure in the supply line 30 than if the fluid was not restricted.
  • the restriction 34 comprises a fixed restriction, i.e. there is no variable fluid flow through the restriction. As such, fluid flows through the restriction 34 any time the pump 22 is active. Additional flow may also be metered to other devices or systems.
  • the pump 22 includes a power source 38 that is used to run the pump 22 when activated by the control system 20.
  • the fixed restriction 34 comprises an orifice having an opening defined by a fixed dimension, as shown in Figure 2.
  • the size of the opening is determined based on system requirements, the type of exhaust component, pump size, etc.
  • the opening is circular and the fixed dimension is a diameter Dl; however, openings having other shapes could also be used.
  • the diameter Dl is less than a diameter D2 upstream of the restriction 34 and is less than a diameter D3 downstream of the restriction 34. Decreasing the diameter of the opening at Dl results in a corresponding increase in pressure in the supply line 30.
  • a pressure sensor 40 is located downstream of the pump outlet 26 and upstream of the restriction 34.
  • the pressure sensor 40 measures pressure in the supply line 30 and communicates the measured pressure to the control system 20.
  • the control system 20 includes a controller 42 that adjusts the pump flow rate in response to the measured pressure.
  • the controller 42 can be a dedicated control unit or can be integrated as part of an existing control unit in the vehicle, such as an engine control unit for example.
  • the controller 42 adjusts the pump flow rate by selectively adjusting pump speed to maintain the desired pressure in the supply line 30.
  • the control system 20 utilizes pulse width modulation (PWM) for controlling the pump 22; however, other types of methods could also be used.
  • PWM pulse width modulation
  • the restriction 34 limits a return flow rate to the pump 22 resulting in an increase in pressure in the supply line 30.
  • the system is configured such that pressure achieved in the supply line 30 when the pump 22 is at a maximum flow rate is higher than the desired pressure.
  • the pressure within the supply line 30 should be approximately 10% over the desired pressure.
  • the control system 20 actively adjusts the pump flow rate to maintain the pressure in the supply line 30, i.e. the pressure at the pump outlet 26, at a desired pressure level.
  • the control system 20 adjusts this flow rate based on the measured pressure and the size of the restriction 34.
  • the desired pressure level comprises a pressure range having a predetermined tolerance. For example, if the desired pressure is 150 psi, the controller can be programed to adjust the pump flow rate to hold the pressure within 145-155 psi in the supply line 30.
  • a fault code can be generated if the pressure exceeds a maximum limit or falls below a minimum limit.
  • the fault code can be stored within memory in the control system and/or communicated to an operator or technician as needed.
  • the system comprises a re-circulating system where fluid is pumped through a return flow path with the pressure at the pump outlet being maintained within a certain tolerance.
  • the flow rate of the pump is controlled/adjusted in combination with the return flow having a fixed, i.e. non-variable restriction.
  • the system adjusts pump speed to maintain the pressure at the desired level based on the size of the restriction and the measured pressure at the pump outlet. Additional non-recirculating flow could also be metered from this pressure- regulated fluid.
  • the advantage with this system is that there is no need for a mechanical pressure regulator such as a spring-loaded valve, for example.
  • the fluid supply could be a separate or dedicated fluid supply for injecting fluid into the exhaust component, such as a urea tank or a vehicle fuel tank for example.

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

La présente invention se rapporte à un système de commande d'une pompe dans un système d'échappement de véhicule, ledit système de commande comprenant une pompe qui comporte un orifice d'admission et un orifice de sortie, une alimentation en fluide qui est en communication fluidique avec l'orifice d'admission, et une conduite d'alimentation qui est en communication fluidique avec l'orifice de sortie. La conduite d'alimentation est configurée pour transmettre un fluide à un composant d'échappement. Un dispositif de commande est configuré pour régler le débit de la pompe afin de conserver une pression souhaitée dans la conduite d'alimentation. Un élément de restriction est utilisé dans un trajet d'écoulement de retour, depuis la conduite d'alimentation.
PCT/US2012/051651 2011-09-20 2012-08-21 Régulation de pression par l'intermédiaire d'une commande de pompe d'un système d'échappement WO2013043291A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13/236,738 2011-09-20
US13/236,738 US20130067889A1 (en) 2011-09-20 2011-09-20 Pressure regulation via pump control for exhaust system

Publications (1)

Publication Number Publication Date
WO2013043291A1 true WO2013043291A1 (fr) 2013-03-28

Family

ID=47879324

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2012/051651 WO2013043291A1 (fr) 2011-09-20 2012-08-21 Régulation de pression par l'intermédiaire d'une commande de pompe d'un système d'échappement

Country Status (2)

Country Link
US (1) US20130067889A1 (fr)
WO (1) WO2013043291A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2949812B1 (fr) * 2009-09-10 2012-03-30 Peugeot Citroen Automobiles Sa Dispositif et procede de regulation de l'injection d'une quantite de reducteur en phase gaz
CN106574535B (zh) 2014-08-15 2019-04-30 罗伯特·博世有限公司 带有压力控制的柴油机尾气处理液输送系统
US9677444B2 (en) 2015-08-19 2017-06-13 Caterpillar Inc. Reductant supply system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008081219A1 (fr) * 2006-12-29 2008-07-10 Renault Trucks Appareil pour l'injection d'un fluide pour un dispositif de traitement de gaz d'échappement, véhicule équipé d'un tel appareil et procédé de commande d'un tel appareil.
US20080282681A1 (en) * 2006-06-26 2008-11-20 Nissan Diesel Motor Co., Ltd. Exhaust emission purifying apparatus for engine
US20090301064A1 (en) * 2008-06-05 2009-12-10 Eugen Maier Urea pump assembly for an exhaust gas treatment system
US20100071349A1 (en) * 2007-02-19 2010-03-25 Eiichi Kitazawa Clogging determining device for reducing agent passage and clogging determining method for reducing agent passage

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020170538A1 (en) * 2001-04-12 2002-11-21 Martin Thomas B. Lube control valve
FR2917791B1 (fr) * 2007-06-20 2009-08-21 Inergy Automotive Systems Res Procede pour le demarrage d'une pompe.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080282681A1 (en) * 2006-06-26 2008-11-20 Nissan Diesel Motor Co., Ltd. Exhaust emission purifying apparatus for engine
WO2008081219A1 (fr) * 2006-12-29 2008-07-10 Renault Trucks Appareil pour l'injection d'un fluide pour un dispositif de traitement de gaz d'échappement, véhicule équipé d'un tel appareil et procédé de commande d'un tel appareil.
US20100071349A1 (en) * 2007-02-19 2010-03-25 Eiichi Kitazawa Clogging determining device for reducing agent passage and clogging determining method for reducing agent passage
US20090301064A1 (en) * 2008-06-05 2009-12-10 Eugen Maier Urea pump assembly for an exhaust gas treatment system

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