Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/02—Circuit arrangements for generating control signals
  • F02D41/021—Introducing corrections for particular conditions exterior to the engine
  • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
  • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
  • F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
• • 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
  • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
  • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
  • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
  • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors
• • 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
  • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
  • F01N3/106—Auxiliary oxidation catalysts
• • 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
  • F01N9/00—Electrical control of exhaust gas treating apparatus
  • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
  • F02D29/04—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving pumps
• • 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
  • F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
  • F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
• • 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
  • F01N2900/0601—Parameters used for exhaust control or diagnosing being estimated
• • 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
  • F01N2900/10—Parameters used for exhaust control or diagnosing said parameters being related to the vehicle or its 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
  • 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
  • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
  • F01N2900/1404—Exhaust gas temperature
• • 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
  • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
  • F01N2900/1626—Catalyst activation temperature
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/02—Circuit arrangements for generating control signals
  • F02D41/021—Introducing corrections for particular conditions exterior to the engine
  • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
  • F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
  • F02D2041/026—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus using an external load, e.g. by increasing generator load or by changing the gear ratio
• • 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
  • Y02T10/40—Engine management systems

Definitions

• the present disclosure relates to a device- for regenerating a soot particle filter.
• the exhaust gas norms Issued by the European Union provide for a stepwise reduction of the soot particles produced by diesel engines and expelled with the engine exhaust gas into the environment.
• the limitation of the soot particle expulsion is carried out by using soot particle filters.
• Exhaust gas flow exiting from the diese! engine penetrates a porous filter wail of the soot particle filter, the porous filter wall being made of, for example-, a ceramic or a metal material.
• the soot particles entrained in the exhaust gas How are hereby deposited both on the surface as well as the interior of the filter wall, so that the exhaust gas counter pressure rises as the degree of clogging of the filter wall increases.
• the deposited soot particles are burned at regular time intervals, but for this to occur, the temperature of the exhaust gas flow may need to be 500°C or greater, To reach such temperatures, an oxidation catalyst may need to be positioned upstream of the soot particie filter.
• An oxidation catalyst typically requires a start-up temperature of between 250°C and 300°C, but under iow-load conditions, the oxidation catalyst may not reach such temperatures.
• the device comprises an oxidation catalyst, a soot particulate filter a. hydraulic circuit, and a second hydraulic circuit.
• the oxidation catalyst. Is configured to raise a temperature of an exhaust gas flow, and the soot particle filter is configured to remove soot particles therefrom.
• the soot, particle filter Is positioned downstream of the oxidation catalyst.
• the hydraulic circuit is associated with the soot particle filter and also associated with the oxidation catalyst.
• the secondary hydraulic circuit is fluidly coupled to the hydraulic circuit.
• the secondary hydraulic circuit comprises a pressure limiting valve and a pressure control valve.
• the pressure limiting valve is positioned downstream of the pressure control valve.
• the secondary hydraulic circuit is configured so as to apply a load if a trigger criterion indicating a need to regenerate the soot particle filter Is satisfied.
• FIG 1. is a schematic illustration of a. device for regenerating a diesel particulate filter
• a device 10 comprises a soot particle filter 12 for use in, for example, an agricultural vehicle or an industrial vehicle.
• the soot particle filler 12 may be a traditional wall flow filter.
• An exhaust gas flow 16 produced by a diesel engine 14 penetrates a porous filter wall 18 made of a ceramic or metal material.
• the soot particles, entrained In the exhaust gas flow 16 are deposited on the surface and the interior of the porous filter wall 18 of the soot particle filter 12.
• the exhaust gas counter pressure Increases, requiring that the deposited soot particles be burned, at regular time intervals, for regenerating the sool particle filter 12.
• the temperature of the exhaust gas flow 18 Is periodically raised to temperatures above 500°C using an oxidation catalyst 20, which may be positioned upstream of the soot particle filter 12.
• the startup temperature that is required for the operation of the oxidation catalyst 20 is typically between 250°C and 300 ° C. Under low-load conditions, the temperature of the exhaust gas flow 18 may not reach the start- up temperature of the oxidation catalyst 20.
• a parasitic load 24 may be connected to a hydraulic circuit 22. The parasitic load 24 may be driven by the d iesel engine 14 if a trigger criterion indicating a regeneration of the soot particle filter 12 is satisfied,
• the parasitic load 24 comprises a pressure limiting valve 28 positioned in a secondary hydraulic circuit 28, which automatically assumes a permeable valve position when a limiting pressure close to the entry side is exceeded.
• the pressure limiting valve 28 can be adjusted with regard to its limiting pressure, and the limiting pressure adjustment may be performed via a control unit 30 in accordance with a load coefficient indicating a momentary utilization of the diesel engine 14.
• the control unit 30 determines the load coefficient by evaluating RPM data from the engine control device 32.
• the RPM data ailows for an indirect conclusion with regard to the momentary temperature of the exhaust gas flow.
• the determination of the momentary temperature of the exhaust gas flow 18 may be made by for example, using a temperature, sensor 34 positioned, in the exhaust gas flow 18. upstream from the oxidation catalyst 20, The sensor data that is made available by the temperature sensor 34 may form the basis for determining a corresponding temperature, The control unit 30 may use the temperature so that it can then adjust the limiting pressure of the pressure limiting valve 28.
• the momentary temperature of the exhaust gas flow 16, given by the load coefficient and/or the temperature magnitude, may be used by the control unit 30 for the determination of a possible compensating temperature difference with respect to the start-up temperature of the oxidation catalyst 20. if the control unit 30 determines that the temperature difference exceeds a
• the prespecified threshold value then it may increase the limiting pressure of the pressure limiting valve 28 and, therefore, the power dissipation of the diesel engine 14.
• the result is that the temperature of the exhaust gas flow 18 reaches: the required start-up temperature of the oxidation catalyst 20, even before the beginning of the regeneration process,
• control unit 30 may consider the change over time and the momentary temperature of the exhaust gas flow 18, given by the load coefficient and/or the temperature magnitude- Thus, a prediction of the parasitic load 24, in the secondary hydraulic circuit 28, required to reach the start-up temperature of the oxidation catalyst 20 may be possible.
• a pressure control valve 38 located in the secondary hydraulic circuit 26.
• the pressure control valve 36 Is an electrically actuatabte 2/2-way valve 38, wherein it is brought to a permeable valve position by the control unit 30 when the trigger criterion is satisfied.
• the trigger criterion may be satisfied if, for example, the control unit 30 determines, by the evaluation of the data of a time lapse control (implemented in the engine control device 32), that a regeneration of the soot particle filter 12 is imminent.
• the hydraulic circuit 22 is operated by means of a variable displacement pump 42, which is supplied from a hydraulic reservoir 40 and driven by the diesel engine 14.
• a control entry 44 of the variable displacement pump 42 may be connected to a section of the secondary hydraulic circuit 26 between the pressure control valve 36 and the pressure limiting valve 28.
• the pressure decline that appears with the connection of the parasitic load 24 at the control entry 44 causes the variable displacement pump 42 to convey an increased volume flow. This causes a rapid buildup of the limiting pressure In the secondary hydraulic circuit 28, which may be required for the opening of the pressure limiting valve 28, Throttle elements 46 and 48 may be used to ensure the formation of stable pressure conditions in the hydraulic circuit 22 or In the secondary hydraulic circuit 26..

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

Priority Applications (1)

Applications Claiming Priority (1)

Publications (1)

Family

ID=50341800

Family Applications (1)

Country Status (1)

Cited By (1)

Citations (5)

• 2012
  • 2012-09-21 WO PCT/US2012/056448 patent/WO2014046664A1/fr not_active Ceased

Patent Citations (6)

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