US20140352279A1 - Exhaust gas treatment system with emission control during filter regeneration - Google Patents
Exhaust gas treatment system with emission control during filter regeneration Download PDFInfo
- Publication number
- US20140352279A1 US20140352279A1 US13/906,940 US201313906940A US2014352279A1 US 20140352279 A1 US20140352279 A1 US 20140352279A1 US 201313906940 A US201313906940 A US 201313906940A US 2014352279 A1 US2014352279 A1 US 2014352279A1
- Authority
- US
- United States
- Prior art keywords
- exhaust gas
- particulate filter
- scr
- temperature
- heat exchange
- 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.)
- Abandoned
Links
Images
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
- F01N3/02—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
-
- 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
- F01N3/2046—Periodically cooling 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0093—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are of the same type
-
- 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, e.g. catalysed diesel particulate filters
-
- 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
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
-
- 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
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
-
- 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
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
-
- 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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/14—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics having more than one sensor of one kind
-
- 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
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1406—Exhaust gas 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
-
- 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 invention relates generally to an exhaust gas treatment system for a vehicle and a method for controlling the exhaust gas treatment system.
- NOx gases are created when nitrogen and oxygen molecules present in engine intake air are exposed to high temperatures of combustion.
- Exhaust gas treatment systems are used in vehicles in order to reduce and manage the NOx gases created in the combustion process.
- Exhaust gas treatment systems generally employ a selective catalytic reduction (SCR) device which uses a reductant, such as ammonia, capable of reacting with NOx gases in combination with excess oxygen in order to reduce the NOx gases.
- SCR selective catalytic reduction
- Exhaust gas treatment systems also employ particulate filters to filter out particles or particulate matter produced by the engine.
- the particulate filter On regular intervals, the particulate filter has to be thermally regenerated in order to remove the accumulated particles.
- the temperature of the particulate filter As the temperature of the particulate filter is increased, the temperature of the SCR device is also increased, resulting in ammonia being desorbed from the SCR device.
- the ammonia may pass through the particulate filter and be oxidized to form NOx gases, thereby increasing NOx emissions during the thermal regeneration of the particulate filter.
- An exhaust gas treatment system for an engine producing an exhaust gas includes an exhaust gas inlet tube configured to receive the exhaust gas from the engine.
- a particulate filter, a heat exchange system and first and second selective catalytic reduction (SCR) devices are in fluid communication with the exhaust gas inlet tube.
- the heat exchange system is positioned downstream of the particulate filter.
- the first and second SCR devices are positioned upstream and downstream of the heat exchange system, respectively.
- the particulate filter is configured to undergo thermal regeneration when the exhaust gas in the particulate filter is heated above a regeneration temperature.
- a first temperature sensor is operatively connected to the second SCR device and configured to determine a present second SCR temperature (T S2 ) of the second SCR device.
- a controller is operatively connected to the first temperature sensor and configured to determine whether the thermal regeneration is taking place in the particulate filter.
- the controller is configured to control the temperature difference (T S2 ⁇ T O ) between the present second SCR temperature (T S2 ) and a predefined optimal second SCR temperature (T O ) to be within a predefined threshold during the thermal regeneration of the particulate filter.
- An injector is operatively connected to the first SCR device and configured to selectively inject a reductant into the first SCR device.
- the reductant is configured to travel to the second SCR device.
- the controller may be configured to direct the injector to inject the reductant when the temperature difference (T S2 ⁇ T O ) is below a predefined threshold, thereby controlling the NOx emission in the exhaust gas during the thermal regeneration of the particulate filter.
- the predefined optimal second SCR temperature (T O ) is between approximately 200 and 220° Celsius.
- the predefined optimal second SCR temperature (T O ) is approximately 220° Celsius and the predefined threshold is approximately 10° Celsius.
- the controller being configured to control the temperature difference (T S2 ⁇ T O ) to be within a predefined threshold includes directing the heat exchange system to transfer heat from the exhaust gas when the temperature difference (T S2 ⁇ T O ) is above the predefined threshold.
- the exhaust gas treatment system uses the heat exchange system to control the present second SCR temperature (T S2 ) of the second SCR device during the thermal regeneration of the particulate filter.
- First and second pressure sensors may be positioned upstream and downstream of the particulate filter, respectively.
- the first and second pressure sensors are configured to determine a differential pressure across the particulate filter.
- the controller may be configured to determine whether the thermal regeneration is taking place in the particulate filter by determining when the differential pressure across the particulate filter is above a predefined threshold pressure.
- a second temperature sensor is operatively connected to and configured to determine a present filter temperature (T F ) of the particulate filter.
- the controller may be configured to determine whether the thermal regeneration is taking place in the particulate filter by determining whether the present filter temperature (T F ) of the particulate filter has elapsed a predefined amount of time at a predefined temperature.
- the predefined amount of time is 30 minutes and the predefined temperature is 550 Celsius.
- the first SCR device may include a first catalyst and the particulate filter may include a plurality of channels having respective walls.
- the first SCR device and the particulate filter may be disposed in a common housing such that the first catalyst is coated on the respective walls of the plurality of channels of the particulate filter.
- First and second NOx sensors may be positioned upstream and downstream of the particulate filter, respectively. The first and the second NOx sensors are configured to determine respective amounts of NOx in the exhaust gas upstream and downstream of the particulate filter.
- the heat exchange system may include an inlet portion configured to receive the exhaust gas from the particulate filter.
- An outlet portion of the heat exchange system is configured to transmit the exhaust gas to the second SCR device.
- An interior cavity connects the inlet and outlet portions and defines a central passageway and a bypass passageway.
- a heat exchange device is positioned within the bypass passageway and configured to transfer heat from the exhaust gas.
- a bypass valve is selectively movable between a plurality of positions to selectively permit the exhaust gas entering the second SCR device to include a first portion from the central passageway and a second portion from the bypass passageway.
- the bypass valve may be positioned such that the first portion is approximately 100% and the second portion is approximately 0% when the temperature difference (T S2 ⁇ T O ) is below the predefined threshold.
- the bypass valve may be positioned such that the first portion is approximately 60% and the second portion is approximately 40% when the temperature difference (T S2 ⁇ T O ) is above the predefined threshold.
- a coolant circuit may be operatively connected to the heat exchange system such that the heat exchange device is configured to selectively transfer heat from the exhaust gas to the coolant circuit.
- a method for controlling operation of the exhaust gas treatment system is provided.
- FIG. 1 is a schematic illustration of an exemplary exhaust gas treatment system and a controller which uses an algorithm as set forth herein;
- FIG. 2 is a schematic flow diagram for an algorithm or method for controlling the exhaust gas treatment system shown in FIG. 1 ;
- FIG. 3 is a schematic perspective view of an example heat exchange device that may be employed in the exhaust gas treatment system of FIG. 1 .
- FIG. 1 a portion of a vehicle 10 is shown in FIG. 1 having an engine 12 producing an exhaust gas 14 .
- the engine 12 is a diesel engine.
- the vehicle 10 includes an exhaust gas treatment system 16 for treating constituents in the exhaust gas 14 such as oxides of nitrogen (NOx).
- An exhaust gas inlet tube 18 is in fluid communication with and configured to receive the exhaust gas 14 from the engine 12 .
- the treatment system 16 includes a particulate filter 20 in fluid communication with the exhaust gas inlet tube 18 .
- a heat exchange system 22 is in fluid communication with the exhaust gas inlet tube 18 and positioned downstream of the particulate filter 20 .
- a first selective catalytic reduction (SCR) device 24 is in fluid communication with the exhaust gas inlet tube 18 and positioned upstream of the heat exchange system 22 .
- a second selective catalytic reduction (SCR) device 26 is in fluid communication with the exhaust gas inlet tube 18 and positioned downstream of the heat exchange system 22 .
- the first and second SCR devices 24 , 26 are aimed at reducing oxides of nitrogen (NOx) in the exhaust gas 14 by conversion to nitrogen and water vapor.
- NOx oxides of nitrogen
- the first and second SCR devices 24 , 26 use a reductant 28 capable of reacting with NOx in combination with excess oxygen.
- the reductant 28 may be urea, ammonia, an ammonia precursors or any other suitable material.
- the reductant 28 is diesel exhaust fluid (DEF).
- an injector 29 is operatively connected to the first SCR device 24 and configured to selectively inject the reductant 28 into the first SCR device 24 .
- the reductant 28 is configured to travel to the second SCR device 26 , through the particulate filter 20 and the heat exchange system 22 .
- a second injector (not shown) may be operatively connected to and configured to inject the reductant 28 into the second SCR device 26 .
- a mixer 30 may be fluidly connected to the exhaust gas inlet tube 18 .
- the mixer 30 may be positioned in close proximity to the injector 29 to enable through mixing of the reductant 28 with the exhaust gas 14 .
- the mixer 30 may include longitudinally-oriented channels that allow the exhaust gas 14 and the reductant 28 to mix prior to entering the first SCR device 24 .
- the second SCR device 26 includes a carrier or substrate 34 that is dipped into a washcoat containing an active catalytic component, referred to herein as second catalyst 36 .
- the second catalyst 36 is coated onto the substrate 34 .
- the second catalyst 36 may be an oxide of a base metal such as vanadium, molybdenum, tungsten and zeolite.
- the second catalyst 36 is an iron- or copper-exchanged zeolite.
- the second catalyst 36 requires an optimal temperature within the second SCR device 26 .
- the substrate 34 is configured to increase the surface area available for coating of the second catalyst 36 .
- the substrate 34 may be composed of a ceramic honey-comb like block, metal or any other suitable material.
- the substrate 34 may be supported with a metallic or mineral ‘mat’ (not shown) and then packaged into a container 38 .
- the container 38 may be a stainless steel can. Any substrate 34 may be employed in the second SCR device 26 .
- the particulate filter 20 is used to filter out particles or particulate matter produced by the engine 12 . These particles may include soot, hydrocarbons, ashes and sulphuric acid.
- the particulate filter 20 may include a plurality of channels 40 which are one-ended and have respective porous walls. The exhaust gas 14 travels through the porous walls of the channels 40 , as shown by arrow 42 , leaving particles filtered on the walls of the channels 40 .
- the channels 40 may be composed of ceramic or any other suitable materials.
- the first SCR device 24 includes an active catalytic component, referred to herein as first catalyst 44 .
- the first catalyst 44 may be an oxide of a base metal such as vanadium, molybdenum, tungsten and zeolite. In one example, the first catalyst 44 is a copper-exchanged zeolite.
- the first SCR device 24 and the particulate filter 20 may be disposed in a common housing 46 such that the first catalyst 44 is coated on the respective walls of the channels 40 of the particulate filter 20 .
- the exhaust treatment system 16 includes one or more sensors at various locations for sensing the temperature, pressure and other properties of the system 16 .
- a first temperature sensor 48 is operatively connected to the second SCR device 26 and configured to determine a present temperature (referred to herein as “present second SCR temperature T S2 ”) of the second SCR device 26 .
- a second temperature sensor 50 is operatively connected to and configured to determine a present filter temperature (T F ) of the particulate filter 20 .
- First and second NOx sensors 52 , 53 may be positioned upstream and downstream of the particulate filter 20 , respectively.
- the first and the second NOx sensors 52 , 53 are configured to determine respective amounts of NOx in the exhaust gas 14 upstream and downstream of the particulate filter 20 .
- First and second pressure sensors 54 , 56 may be positioned upstream and downstream of the particulate filter 20 , respectively.
- the first and second pressure sensors 54 , 56 are configured to determine a differential pressure across the particulate filter 20 .
- the exhaust gas treatment system 16 may include an oxidation catalyst 58 .
- the oxidation catalyst 58 is located upstream of the particulate filter 20 . Exhaust gas 14 from the engine 12 passes through the oxidation catalyst 58 , and into the first SCR device 24 .
- the oxidation catalyst 58 converts the NO (nitrogen monoxide) gas into NO 2 , which is easily treated in the first SCR device 24 .
- the oxidation catalyst 58 also eliminates some sulphur derivatives and other compounds from the exhaust gas 14 by oxidizing them to other compounds. As the oxidation catalyst 58 oxidizes the hydrocarbon emissions in the exhaust gas 14 , heat is released due to the exothermic nature of the reactions. This heat may be used to complete the regeneration of the particulate filter 20 , as described below.
- the particulate filter 20 On regular intervals, the particulate filter 20 has to be regenerated in order to remove the accumulated particles.
- the particulate filter 20 is configured to undergo thermal regeneration when the exhaust gas 14 in the particulate filter 20 is heated above a regeneration or combustion temperature, thereby allowing the particles to combust or burn.
- the regeneration temperature is between 600-750° C. Any suitable method of performing regeneration may be employed, including but not limited to, using a fuel burner, using resistive heating coils and using microwave energy.
- the temperature of the particulate filter 20 As the temperature of the particulate filter 20 is increased, the temperature of the first SCR device 24 is also increased, resulting in the reductant 28 , such as ammonia, being desorbed from the first SCR device 24 .
- the ammonia may pass through the particulate filter 20 and be oxidized to form NOx gases (various oxides of nitrogen), thereby increasing NOx emissions during thermal regeneration of the particulate filter 20 .
- a controller 60 is operatively connected to the engine 12 and other components of the vehicle 10 .
- Controller 60 is configured to minimize NOx emissions in the exhaust gas 14 during the thermal regeneration of the particulate filter 20 . Controller 60 does so by executing an algorithm 200 which resides within the controller 60 or is otherwise readily executable by the controller 60 .
- the controller 60 may be microprocessor based such as a computer having a central processing unit, memory (RAM and/or ROM), and associated input and output buses.
- the controller 60 may be an application-specific integrated circuit or may be formed of other logic devices known in the art.
- the controller 60 may be a portion of a central vehicle main control unit such as the engine control module (ECM), an interactive vehicle dynamics module, a main control module, a control circuit having a power supply, combined into a single integrated control module, or may be a stand-alone control module.
- ECM engine control module
- main control module main control module
- control circuit having a power supply combined into a single integrated control module, or may be a stand-alone control module.
- Algorithm 200 may begin with step 202 , where the controller 60 of FIG. 1 determines whether the thermal regeneration is taking place in the particulate filter 20 . This may be done in multiple ways. In one embodiment, the controller 60 may be configured to determine whether the thermal regeneration is taking place in the particulate filter 20 by determining when a differential pressure across the particulate filter 20 (as determined by first and second pressure sensors 54 , 56 shown in FIG. 1 ) is above a predefined threshold pressure. In one example, the predefined threshold pressure may be approximately 4-5 g/L loading.
- the controller 60 may be configured to determine whether the thermal regeneration is taking place in the particulate filter 20 by determining whether the present filter temperature (T F ) of the particulate filter 20 (as determined by the second temperature sensor 50 shown in FIG. 1 ) has elapsed a predefined amount of time at a predefined temperature.
- the predefined amount of time is 30 minutes and the predefined temperature is 550 Celsius. Any other suitable way of determining when the thermal regeneration is taking place may be employed.
- step 204 of FIG. 2 the controller 60 controls the temperature difference (T S2 ⁇ T O ) between the present second SCR temperature (T S2 ) of the second SCR device 26 and a predefined optimal SCR temperature (T O ) to be within a predefined threshold during the thermal regeneration of the particulate filter 20 . This may be done via sub-steps 204 A-C as described below.
- the controller 60 determines the present second SCR temperature (T S2 ) of the second SCR device 26 , based on the first temperature sensor 48 operatively connected to the second SCR device 26 . In sub-step 204 B of FIG. 2 , the controller 60 determines whether the temperature difference (T S2 ⁇ T O ) is above or below a predefined threshold.
- the controller 60 directs the heat exchange system 22 to transfer heat from the exhaust gas 14 when the temperature difference (T S2 ⁇ T O ) is above the predefined threshold.
- the predefined optimal second SCR temperature (T O ) is between approximately 200 and 220° Celsius. In another example, the predefined optimal second SCR temperature (T O ) is approximately 220° Celsius and the predefined threshold is approximately 10° Celsius.
- the controller 60 directs the heat exchange system 22 to transfer heat from the exhaust gas 14 until the present second SCR temperature (T S2 ) is within approximately 10° Celsius of the optimal second SCR temperature (T O ), or (T S2 ⁇ T O ) ⁇ 10.
- the exhaust gas treatment system 16 uses the heat exchange system 22 to maintain an optimal temperature of the second SCR device 26 during the thermal regeneration of the particulate filter 20 .
- algorithm 200 loops back to step 204 until the temperature difference (T S2 ⁇ T O ) is no longer above the predefined threshold.
- the controller 60 directs the injector 29 to inject the reductant 28 when the temperature difference (T S2 ⁇ T O ) is below the predefined threshold in order to control the NOx emission in the exhaust gas 14 .
- the reductant 28 is configured to travel to the second SCR device 26 , where a NOx reduction reaction takes place with the aid of second catalyst 36 , thereby reducing the amount of NOx emission in the exhaust gas 14 .
- the controller 60 may determine the amount of the reductant 28 to be injected by the injector 29 based upon a number of combination factors.
- the factors may include, but are not limited to, the respective amounts of NOx in the exhaust gas 14 upstream and downstream of the particulate filter 20 , the present second SCR temperature (T S2 ), the amount of first and second catalysts 44 , 36 in the first and second SCR devices 24 , 26 , respectively, and the exhaust flow rate at the exhaust gas inlet tube 18 of the engine 12 .
- the heat exchange system 22 may be a portion of a vehicle exhaust gas heat recovery (EGHR) system or it may be a separate unit installed within the vehicle 10 .
- the heat exchange system 22 may include an inlet portion 62 configured to receive the exhaust gas 14 from the particulate filter 20 .
- An outlet portion 64 of the heat exchange system 22 is configured to transmit the exhaust gas 14 to the second SCR device 26 .
- An interior cavity 66 connects the inlet and outlet portions 62 , 64 and defines a central passageway 68 and a bypass passageway 70 .
- the heat exchange system 22 includes a heat exchange device 72 positioned within the bypass passageway 70 .
- the heat exchange device 72 functions as a heat sink within the heat exchange system 22 and is configured to transfer heat from the exhaust gas 14 travelling through the bypass passageway 70 .
- a bypass valve 74 controls flow of the exhaust gas 14 through the heat exchange device 72 .
- the bypass valve 74 may be moved in response to a control signal from a controller 60 .
- the bypass valve 74 may be controlled by a solenoid, a mechanical thermostat, a wax motor, vacuum actuator, or other suitable controls.
- the bypass valve 74 is selectively movable between a plurality of positions, such as 76 A, B and C, to selectively permit the exhaust gas 14 entering the second SCR device 26 to include a first portion 78 from the central passageway 68 and a second portion 80 from the bypass passageway 70 .
- the first and second portions 78 , 80 may be anywhere between 0 and 100% of the total amount of the exhaust gas 14 .
- the controller 60 may direct the bypass valve 74 to the first position 76 A when the temperature difference (T S2 ⁇ T O ) is below the predefined threshold. In the first position 76 A, the first portion 78 may be approximately 100% and the second portion 80 may be approximately 0%, i.e., only exhaust gas 14 from the central passageway 68 is permitted to enter the second SCR device 26 .
- the controller 60 may direct the bypass valve 74 to the second position 76 B when the temperature difference (T S2 ⁇ T O ) is above the predefined threshold.
- the first portion 78 may be approximately 60% and the second portion 80 may be approximately 40%.
- the controller 60 may also direct the bypass valve 74 to a third position 76 C, in which the first portion 78 is approximately 0% and the second portion 80 is approximately 100%.
- the bypass valve 74 may be positioned at the outlet portion 64 .
- the bypass valve 74 may also be positioned at the inlet portion 62 .
- the range of motion of the bypass valve 74 may be varied based on the particular application at hand.
- the heat exchange system 22 is configured to transfer heat from the exhaust gas 14 to a coolant circuit 82 , thereby warming a coolant 84 within the coolant circuit 82 .
- Coolant 84 may flow into and out of the heat exchange system 22 through a coolant inlet port 86 and a coolant output port 88 , respectively.
- the coolant circuit 82 is configured to connect the engine 12 and the heat exchange system 22 .
- the coolant circuit 82 is supplied with pressurized coolant 84 by a primary pump 90 incorporated with the engine 12 .
- the primary pump 90 may be a mechanical pump driven by rotation of the engine crankshaft (not shown).
- An auxiliary pump 92 may be used to add pressure and increase flow through the coolant circuit 82 .
- the auxiliary pump 92 may be used to supplement the primary pump 90 or may be used as the sole pump in certain situations, for example, when the engine 12 and the primary pump 90 are not operating.
- the coolant circuit 82 may transfer heat between various vehicle components, including the engine 12 , the exhaust system 16 , a heater core 94 , and the vehicle transmission (not shown).
- the heater core 94 allows heat to be transferred from the coolant 84 leaving the engine 12 to the passenger compartment (not shown) of the vehicle 10 .
- the coolant circuit 82 may include a heater core bypass 98 in parallel with the heater core 94 , and a heater core bypass valve 96 configured to control flow of coolant 84 through the heater core 94 and the heater core bypass 98 .
- the coolant circuit 82 may include flow restrictors, such as restrictor 99 , placed at various locations within the circuit 82 .
- the vehicle 10 may include various other components known to those skilled in the art, including but not limited to, a radiator, transmission heat exchanger and thermostat (not shown).
- FIG. 3 is a schematic perspective view of an example heat exchange device 72 that may be employed in the exhaust gas treatment system 16 of FIG. 1 .
- the heat exchange device 72 may include a plurality of plates 102 having respective spaces 104 between the plates 102 .
- the respective spaces 104 define a first flow path for the exhaust gas 14 .
- Each of the plates 102 may include one or more respective slots 106 A, B, C and D.
- the respective slots 106 A-D may be aligned to fit respective tubes 108 A-D configured for flow of the coolant 84 .
- the location and number of slots in each plate 102 may be varied based on the particular application at hand.
- the plates 102 and tubes 108 A-D may include corrugations to improve the efficiency of heat transfer.
- the device shown in FIG. 3 is one example and any suitable type of device known to those skilled in the art may be employed.
- the controller 60 of FIG. 1 may include a computing device that employs an operating system or processor for storing and executing computer-executable instructions.
- Computer-executable instructions may be compiled or interpreted from computer programs created using a variety of programming languages and/or technologies, including, without limitation, and either alone or in combination, JavaTM, C, C++, Visual Basic, Java Script, Perl, etc.
- a processor e.g., a microprocessor
- receives instructions e.g., from a memory, a computer-readable medium, etc., and executes these instructions, thereby performing one or more processes, including one or more of the processes described herein.
- Such instructions and other data may be stored and transmitted using a variety of computer-readable media.
- a computer-readable medium includes any non-transitory (e.g., tangible) medium that participates in providing data (e.g., instructions) that may be read by a computer (e.g., by a processor of a computer).
- a medium may take many forms, including, but not limited to, non-volatile media and volatile media.
- Non-volatile media may include, for example, optical or magnetic disks and other persistent memory.
- Volatile media may include, for example, dynamic random access memory (DRAM), which may constitute a main memory.
- Such instructions may be transmitted by one or more transmission media, including coaxial cables, copper wire and fiber optics, including the wires that comprise a system bus coupled to a processor of a computer.
- Some forms of computer-readable media include, for example, a floppy disk, a flexible disk, hard disk, magnetic tape, any other magnetic medium, a CD-ROM, DVD, any other optical medium, punch cards, paper tape, any other physical medium with patterns of holes, a RAM, a PROM, an EPROM, a FLASH-EEPROM, any other memory chip or cartridge, or any other medium from which a computer can read.
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)
- Processes For Solid Components From Exhaust (AREA)
Abstract
Description
- The present invention relates generally to an exhaust gas treatment system for a vehicle and a method for controlling the exhaust gas treatment system.
- Internal combustion engines produce a number of emissions, including various oxides of nitrogen, referred to collectively herein as NOx gases. NOx gases are created when nitrogen and oxygen molecules present in engine intake air are exposed to high temperatures of combustion. Exhaust gas treatment systems are used in vehicles in order to reduce and manage the NOx gases created in the combustion process. Exhaust gas treatment systems generally employ a selective catalytic reduction (SCR) device which uses a reductant, such as ammonia, capable of reacting with NOx gases in combination with excess oxygen in order to reduce the NOx gases.
- Exhaust gas treatment systems also employ particulate filters to filter out particles or particulate matter produced by the engine. On regular intervals, the particulate filter has to be thermally regenerated in order to remove the accumulated particles. As the temperature of the particulate filter is increased, the temperature of the SCR device is also increased, resulting in ammonia being desorbed from the SCR device. The ammonia may pass through the particulate filter and be oxidized to form NOx gases, thereby increasing NOx emissions during the thermal regeneration of the particulate filter.
- An exhaust gas treatment system for an engine producing an exhaust gas includes an exhaust gas inlet tube configured to receive the exhaust gas from the engine. A particulate filter, a heat exchange system and first and second selective catalytic reduction (SCR) devices are in fluid communication with the exhaust gas inlet tube. The heat exchange system is positioned downstream of the particulate filter. The first and second SCR devices are positioned upstream and downstream of the heat exchange system, respectively. The particulate filter is configured to undergo thermal regeneration when the exhaust gas in the particulate filter is heated above a regeneration temperature. A first temperature sensor is operatively connected to the second SCR device and configured to determine a present second SCR temperature (TS2) of the second SCR device. A controller is operatively connected to the first temperature sensor and configured to determine whether the thermal regeneration is taking place in the particulate filter. The controller is configured to control the temperature difference (TS2−TO) between the present second SCR temperature (TS2) and a predefined optimal second SCR temperature (TO) to be within a predefined threshold during the thermal regeneration of the particulate filter.
- An injector is operatively connected to the first SCR device and configured to selectively inject a reductant into the first SCR device. The reductant is configured to travel to the second SCR device. The controller may be configured to direct the injector to inject the reductant when the temperature difference (TS2−TO) is below a predefined threshold, thereby controlling the NOx emission in the exhaust gas during the thermal regeneration of the particulate filter. In one example, the predefined optimal second SCR temperature (TO) is between approximately 200 and 220° Celsius. In another example, the predefined optimal second SCR temperature (TO) is approximately 220° Celsius and the predefined threshold is approximately 10° Celsius.
- The controller being configured to control the temperature difference (TS2−TO) to be within a predefined threshold includes directing the heat exchange system to transfer heat from the exhaust gas when the temperature difference (TS2−TO) is above the predefined threshold. Thus, the exhaust gas treatment system uses the heat exchange system to control the present second SCR temperature (TS2) of the second SCR device during the thermal regeneration of the particulate filter.
- First and second pressure sensors may be positioned upstream and downstream of the particulate filter, respectively. The first and second pressure sensors are configured to determine a differential pressure across the particulate filter. The controller may be configured to determine whether the thermal regeneration is taking place in the particulate filter by determining when the differential pressure across the particulate filter is above a predefined threshold pressure.
- A second temperature sensor is operatively connected to and configured to determine a present filter temperature (TF) of the particulate filter. The controller may be configured to determine whether the thermal regeneration is taking place in the particulate filter by determining whether the present filter temperature (TF) of the particulate filter has elapsed a predefined amount of time at a predefined temperature. In one example, the predefined amount of time is 30 minutes and the predefined temperature is 550 Celsius.
- The first SCR device may include a first catalyst and the particulate filter may include a plurality of channels having respective walls. The first SCR device and the particulate filter may be disposed in a common housing such that the first catalyst is coated on the respective walls of the plurality of channels of the particulate filter. First and second NOx sensors may be positioned upstream and downstream of the particulate filter, respectively. The first and the second NOx sensors are configured to determine respective amounts of NOx in the exhaust gas upstream and downstream of the particulate filter.
- The heat exchange system may include an inlet portion configured to receive the exhaust gas from the particulate filter. An outlet portion of the heat exchange system is configured to transmit the exhaust gas to the second SCR device. An interior cavity connects the inlet and outlet portions and defines a central passageway and a bypass passageway. A heat exchange device is positioned within the bypass passageway and configured to transfer heat from the exhaust gas.
- A bypass valve is selectively movable between a plurality of positions to selectively permit the exhaust gas entering the second SCR device to include a first portion from the central passageway and a second portion from the bypass passageway. The bypass valve may be positioned such that the first portion is approximately 100% and the second portion is approximately 0% when the temperature difference (TS2−TO) is below the predefined threshold. The bypass valve may be positioned such that the first portion is approximately 60% and the second portion is approximately 40% when the temperature difference (TS2−TO) is above the predefined threshold.
- A coolant circuit may be operatively connected to the heat exchange system such that the heat exchange device is configured to selectively transfer heat from the exhaust gas to the coolant circuit. A method for controlling operation of the exhaust gas treatment system is provided.
- The above features and advantages and other features and advantages of the present invention are readily apparent from the following detailed description of the best modes for carrying out the invention when taken in connection with the accompanying drawings.
-
FIG. 1 is a schematic illustration of an exemplary exhaust gas treatment system and a controller which uses an algorithm as set forth herein; -
FIG. 2 is a schematic flow diagram for an algorithm or method for controlling the exhaust gas treatment system shown inFIG. 1 ; and -
FIG. 3 is a schematic perspective view of an example heat exchange device that may be employed in the exhaust gas treatment system ofFIG. 1 . - Referring to the drawings, wherein like reference numbers correspond to like or similar components throughout the several figures, a portion of a
vehicle 10 is shown inFIG. 1 having anengine 12 producing anexhaust gas 14. In one example, theengine 12 is a diesel engine. However, the disclosure is applicable to any type of engine. Thevehicle 10 includes an exhaustgas treatment system 16 for treating constituents in theexhaust gas 14 such as oxides of nitrogen (NOx). An exhaustgas inlet tube 18 is in fluid communication with and configured to receive theexhaust gas 14 from theengine 12. - Referring to
FIG. 1 , thetreatment system 16 includes aparticulate filter 20 in fluid communication with the exhaustgas inlet tube 18. Aheat exchange system 22 is in fluid communication with the exhaustgas inlet tube 18 and positioned downstream of theparticulate filter 20. A first selective catalytic reduction (SCR)device 24 is in fluid communication with the exhaustgas inlet tube 18 and positioned upstream of theheat exchange system 22. A second selective catalytic reduction (SCR)device 26 is in fluid communication with the exhaustgas inlet tube 18 and positioned downstream of theheat exchange system 22. The first andsecond SCR devices exhaust gas 14 by conversion to nitrogen and water vapor. The first andsecond SCR devices reductant 28 capable of reacting with NOx in combination with excess oxygen. The reductant 28 may be urea, ammonia, an ammonia precursors or any other suitable material. In one example, the reductant 28 is diesel exhaust fluid (DEF). - Referring to
FIG. 1 , aninjector 29 is operatively connected to thefirst SCR device 24 and configured to selectively inject thereductant 28 into thefirst SCR device 24. Thereductant 28 is configured to travel to thesecond SCR device 26, through theparticulate filter 20 and theheat exchange system 22. Alternatively, a second injector (not shown) may be operatively connected to and configured to inject thereductant 28 into thesecond SCR device 26. - Referring to
FIG. 1 , amixer 30 may be fluidly connected to the exhaustgas inlet tube 18. Themixer 30 may be positioned in close proximity to theinjector 29 to enable through mixing of thereductant 28 with theexhaust gas 14. Themixer 30 may include longitudinally-oriented channels that allow theexhaust gas 14 and thereductant 28 to mix prior to entering thefirst SCR device 24. - The NOx reduction reaction takes place as the
exhaust gas 14 passes through the first andsecond SCR device FIG. 1 , thesecond SCR device 26 includes a carrier orsubstrate 34 that is dipped into a washcoat containing an active catalytic component, referred to herein assecond catalyst 36. Thesecond catalyst 36 is coated onto thesubstrate 34. Thesecond catalyst 36 may be an oxide of a base metal such as vanadium, molybdenum, tungsten and zeolite. In one example, thesecond catalyst 36 is an iron- or copper-exchanged zeolite. For maximum efficiency, thesecond catalyst 36 requires an optimal temperature within thesecond SCR device 26. Thesubstrate 34 is configured to increase the surface area available for coating of thesecond catalyst 36. Thesubstrate 34 may be composed of a ceramic honey-comb like block, metal or any other suitable material. Thesubstrate 34 may be supported with a metallic or mineral ‘mat’ (not shown) and then packaged into acontainer 38. Thecontainer 38 may be a stainless steel can. Anysubstrate 34 may be employed in thesecond SCR device 26. - The
particulate filter 20 is used to filter out particles or particulate matter produced by theengine 12. These particles may include soot, hydrocarbons, ashes and sulphuric acid. Referring toFIG. 1 , theparticulate filter 20 may include a plurality ofchannels 40 which are one-ended and have respective porous walls. Theexhaust gas 14 travels through the porous walls of thechannels 40, as shown byarrow 42, leaving particles filtered on the walls of thechannels 40. Thechannels 40 may be composed of ceramic or any other suitable materials. - Referring to
FIG. 1 , thefirst SCR device 24 includes an active catalytic component, referred to herein asfirst catalyst 44. Thefirst catalyst 44 may be an oxide of a base metal such as vanadium, molybdenum, tungsten and zeolite. In one example, thefirst catalyst 44 is a copper-exchanged zeolite. Thefirst SCR device 24 and theparticulate filter 20 may be disposed in acommon housing 46 such that thefirst catalyst 44 is coated on the respective walls of thechannels 40 of theparticulate filter 20. - The
exhaust treatment system 16 includes one or more sensors at various locations for sensing the temperature, pressure and other properties of thesystem 16. Referring toFIG. 1 , afirst temperature sensor 48 is operatively connected to thesecond SCR device 26 and configured to determine a present temperature (referred to herein as “present second SCR temperature TS2”) of thesecond SCR device 26. Asecond temperature sensor 50 is operatively connected to and configured to determine a present filter temperature (TF) of theparticulate filter 20. First andsecond NOx sensors particulate filter 20, respectively. The first and thesecond NOx sensors exhaust gas 14 upstream and downstream of theparticulate filter 20. First andsecond pressure sensors particulate filter 20, respectively. The first andsecond pressure sensors particulate filter 20. - Referring to
FIG. 1 , the exhaustgas treatment system 16 may include anoxidation catalyst 58. Theoxidation catalyst 58 is located upstream of theparticulate filter 20.Exhaust gas 14 from theengine 12 passes through theoxidation catalyst 58, and into thefirst SCR device 24. Theoxidation catalyst 58 converts the NO (nitrogen monoxide) gas into NO2, which is easily treated in thefirst SCR device 24. Theoxidation catalyst 58 also eliminates some sulphur derivatives and other compounds from theexhaust gas 14 by oxidizing them to other compounds. As theoxidation catalyst 58 oxidizes the hydrocarbon emissions in theexhaust gas 14, heat is released due to the exothermic nature of the reactions. This heat may be used to complete the regeneration of theparticulate filter 20, as described below. - On regular intervals, the
particulate filter 20 has to be regenerated in order to remove the accumulated particles. Theparticulate filter 20 is configured to undergo thermal regeneration when theexhaust gas 14 in theparticulate filter 20 is heated above a regeneration or combustion temperature, thereby allowing the particles to combust or burn. In one example, the regeneration temperature is between 600-750° C. Any suitable method of performing regeneration may be employed, including but not limited to, using a fuel burner, using resistive heating coils and using microwave energy. As the temperature of theparticulate filter 20 is increased, the temperature of thefirst SCR device 24 is also increased, resulting in thereductant 28, such as ammonia, being desorbed from thefirst SCR device 24. The ammonia may pass through theparticulate filter 20 and be oxidized to form NOx gases (various oxides of nitrogen), thereby increasing NOx emissions during thermal regeneration of theparticulate filter 20. - Referring to
FIG. 1 , acontroller 60 is operatively connected to theengine 12 and other components of thevehicle 10.Controller 60 is configured to minimize NOx emissions in theexhaust gas 14 during the thermal regeneration of theparticulate filter 20.Controller 60 does so by executing analgorithm 200 which resides within thecontroller 60 or is otherwise readily executable by thecontroller 60. Thecontroller 60 may be microprocessor based such as a computer having a central processing unit, memory (RAM and/or ROM), and associated input and output buses. Thecontroller 60 may be an application-specific integrated circuit or may be formed of other logic devices known in the art. Thecontroller 60 may be a portion of a central vehicle main control unit such as the engine control module (ECM), an interactive vehicle dynamics module, a main control module, a control circuit having a power supply, combined into a single integrated control module, or may be a stand-alone control module. - Execution of
algorithm 200 is described below with reference toFIG. 2 . The start and exit functions are denoted inFIG. 2 as “S” and “E”, respectively. It is to be appreciated that thecontroller 60 may eliminate one or more steps or may determine the steps in an order other than as described above.Algorithm 200 may begin withstep 202, where thecontroller 60 ofFIG. 1 determines whether the thermal regeneration is taking place in theparticulate filter 20. This may be done in multiple ways. In one embodiment, thecontroller 60 may be configured to determine whether the thermal regeneration is taking place in theparticulate filter 20 by determining when a differential pressure across the particulate filter 20 (as determined by first andsecond pressure sensors FIG. 1 ) is above a predefined threshold pressure. In one example, the predefined threshold pressure may be approximately 4-5 g/L loading. - In another embodiment, the
controller 60 may be configured to determine whether the thermal regeneration is taking place in theparticulate filter 20 by determining whether the present filter temperature (TF) of the particulate filter 20 (as determined by thesecond temperature sensor 50 shown inFIG. 1 ) has elapsed a predefined amount of time at a predefined temperature. In one example, the predefined amount of time is 30 minutes and the predefined temperature is 550 Celsius. Any other suitable way of determining when the thermal regeneration is taking place may be employed. - If thermal regeneration is not taking place, the
algorithm 200 is exited as indicated byline 210. If thermal regeneration is taking place, thealgorithm 200 proceeds to step 204. Instep 204 ofFIG. 2 , thecontroller 60 controls the temperature difference (TS2−TO) between the present second SCR temperature (TS2) of thesecond SCR device 26 and a predefined optimal SCR temperature (TO) to be within a predefined threshold during the thermal regeneration of theparticulate filter 20. This may be done via sub-steps 204A-C as described below. - In sub-step 204A, the
controller 60 determines the present second SCR temperature (TS2) of thesecond SCR device 26, based on thefirst temperature sensor 48 operatively connected to thesecond SCR device 26. In sub-step 204B ofFIG. 2 , thecontroller 60 determines whether the temperature difference (TS2−TO) is above or below a predefined threshold. - In sub-step 204C, the
controller 60 directs theheat exchange system 22 to transfer heat from theexhaust gas 14 when the temperature difference (TS2−TO) is above the predefined threshold. In one example, the predefined optimal second SCR temperature (TO) is between approximately 200 and 220° Celsius. In another example, the predefined optimal second SCR temperature (TO) is approximately 220° Celsius and the predefined threshold is approximately 10° Celsius. In this case, if the present second SCR temperature (TS2) is above 230° Celsius, thecontroller 60 directs theheat exchange system 22 to transfer heat from theexhaust gas 14 until the present second SCR temperature (TS2) is within approximately 10° Celsius of the optimal second SCR temperature (TO), or (TS2−TO)≦10. - Thus, the exhaust
gas treatment system 16 uses theheat exchange system 22 to maintain an optimal temperature of thesecond SCR device 26 during the thermal regeneration of theparticulate filter 20. As shown byline 206,algorithm 200 loops back to step 204 until the temperature difference (TS2−TO) is no longer above the predefined threshold. - In
step 208 ofFIG. 2 , thecontroller 60 directs theinjector 29 to inject thereductant 28 when the temperature difference (TS2−TO) is below the predefined threshold in order to control the NOx emission in theexhaust gas 14. Thereductant 28 is configured to travel to thesecond SCR device 26, where a NOx reduction reaction takes place with the aid ofsecond catalyst 36, thereby reducing the amount of NOx emission in theexhaust gas 14. - The
controller 60 may determine the amount of thereductant 28 to be injected by theinjector 29 based upon a number of combination factors. The factors may include, but are not limited to, the respective amounts of NOx in theexhaust gas 14 upstream and downstream of theparticulate filter 20, the present second SCR temperature (TS2), the amount of first andsecond catalysts second SCR devices gas inlet tube 18 of theengine 12. - Referring to
FIG. 1 , theheat exchange system 22 may be a portion of a vehicle exhaust gas heat recovery (EGHR) system or it may be a separate unit installed within thevehicle 10. Theheat exchange system 22 may include aninlet portion 62 configured to receive theexhaust gas 14 from theparticulate filter 20. Anoutlet portion 64 of theheat exchange system 22 is configured to transmit theexhaust gas 14 to thesecond SCR device 26. Aninterior cavity 66 connects the inlet andoutlet portions central passageway 68 and abypass passageway 70. - Referring to
FIG. 1 , theheat exchange system 22 includes aheat exchange device 72 positioned within thebypass passageway 70. Theheat exchange device 72 functions as a heat sink within theheat exchange system 22 and is configured to transfer heat from theexhaust gas 14 travelling through thebypass passageway 70. Abypass valve 74 controls flow of theexhaust gas 14 through theheat exchange device 72. Thebypass valve 74 may be moved in response to a control signal from acontroller 60. Thebypass valve 74 may be controlled by a solenoid, a mechanical thermostat, a wax motor, vacuum actuator, or other suitable controls. - Referring to
FIG. 1 , thebypass valve 74 is selectively movable between a plurality of positions, such as 76A, B and C, to selectively permit theexhaust gas 14 entering thesecond SCR device 26 to include afirst portion 78 from thecentral passageway 68 and asecond portion 80 from thebypass passageway 70. The first andsecond portions exhaust gas 14. Thecontroller 60 may direct thebypass valve 74 to thefirst position 76A when the temperature difference (TS2−TO) is below the predefined threshold. In thefirst position 76A, thefirst portion 78 may be approximately 100% and thesecond portion 80 may be approximately 0%, i.e., onlyexhaust gas 14 from thecentral passageway 68 is permitted to enter thesecond SCR device 26. - The
controller 60 may direct thebypass valve 74 to thesecond position 76B when the temperature difference (TS2−TO) is above the predefined threshold. In thesecond position 76B, thefirst portion 78 may be approximately 60% and thesecond portion 80 may be approximately 40%. Thecontroller 60 may also direct thebypass valve 74 to athird position 76C, in which thefirst portion 78 is approximately 0% and thesecond portion 80 is approximately 100%. As shown inFIG. 1 , thebypass valve 74 may be positioned at theoutlet portion 64. Thebypass valve 74 may also be positioned at theinlet portion 62. The range of motion of thebypass valve 74 may be varied based on the particular application at hand. - Referring to
FIG. 1 , theheat exchange system 22 is configured to transfer heat from theexhaust gas 14 to acoolant circuit 82, thereby warming acoolant 84 within thecoolant circuit 82.Coolant 84 may flow into and out of theheat exchange system 22 through acoolant inlet port 86 and acoolant output port 88, respectively. Thecoolant circuit 82 is configured to connect theengine 12 and theheat exchange system 22. Thecoolant circuit 82 is supplied withpressurized coolant 84 by aprimary pump 90 incorporated with theengine 12. Theprimary pump 90 may be a mechanical pump driven by rotation of the engine crankshaft (not shown). Anauxiliary pump 92 may be used to add pressure and increase flow through thecoolant circuit 82. Theauxiliary pump 92 may be used to supplement theprimary pump 90 or may be used as the sole pump in certain situations, for example, when theengine 12 and theprimary pump 90 are not operating. - The
coolant circuit 82 may transfer heat between various vehicle components, including theengine 12, theexhaust system 16, aheater core 94, and the vehicle transmission (not shown). Theheater core 94 allows heat to be transferred from thecoolant 84 leaving theengine 12 to the passenger compartment (not shown) of thevehicle 10. Thecoolant circuit 82 may include aheater core bypass 98 in parallel with theheater core 94, and a heatercore bypass valve 96 configured to control flow ofcoolant 84 through theheater core 94 and theheater core bypass 98. Thecoolant circuit 82 may include flow restrictors, such asrestrictor 99, placed at various locations within thecircuit 82. Thevehicle 10 may include various other components known to those skilled in the art, including but not limited to, a radiator, transmission heat exchanger and thermostat (not shown). -
FIG. 3 is a schematic perspective view of an exampleheat exchange device 72 that may be employed in the exhaustgas treatment system 16 ofFIG. 1 . Referring toFIG. 3 , theheat exchange device 72 may include a plurality ofplates 102 havingrespective spaces 104 between theplates 102. Therespective spaces 104 define a first flow path for theexhaust gas 14. Each of theplates 102 may include one or morerespective slots 106A, B, C and D. Referring toFIG. 3 , therespective slots 106A-D may be aligned to fitrespective tubes 108A-D configured for flow of thecoolant 84. The location and number of slots in eachplate 102 may be varied based on the particular application at hand. Theplates 102 andtubes 108A-D may include corrugations to improve the efficiency of heat transfer. The device shown inFIG. 3 is one example and any suitable type of device known to those skilled in the art may be employed. - The
controller 60 ofFIG. 1 may include a computing device that employs an operating system or processor for storing and executing computer-executable instructions. Computer-executable instructions may be compiled or interpreted from computer programs created using a variety of programming languages and/or technologies, including, without limitation, and either alone or in combination, Java™, C, C++, Visual Basic, Java Script, Perl, etc. In general, a processor (e.g., a microprocessor) receives instructions, e.g., from a memory, a computer-readable medium, etc., and executes these instructions, thereby performing one or more processes, including one or more of the processes described herein. Such instructions and other data may be stored and transmitted using a variety of computer-readable media. A computer-readable medium (also referred to as a processor-readable medium) includes any non-transitory (e.g., tangible) medium that participates in providing data (e.g., instructions) that may be read by a computer (e.g., by a processor of a computer). Such a medium may take many forms, including, but not limited to, non-volatile media and volatile media. Non-volatile media may include, for example, optical or magnetic disks and other persistent memory. Volatile media may include, for example, dynamic random access memory (DRAM), which may constitute a main memory. Such instructions may be transmitted by one or more transmission media, including coaxial cables, copper wire and fiber optics, including the wires that comprise a system bus coupled to a processor of a computer. Some forms of computer-readable media include, for example, a floppy disk, a flexible disk, hard disk, magnetic tape, any other magnetic medium, a CD-ROM, DVD, any other optical medium, punch cards, paper tape, any other physical medium with patterns of holes, a RAM, a PROM, an EPROM, a FLASH-EEPROM, any other memory chip or cartridge, or any other medium from which a computer can read. - The detailed description and the drawings or figures are supportive and descriptive of the invention, but the scope of the invention is defined solely by the claims. While some of the best modes and other embodiments for carrying out the claimed invention have been described in detail, various alternative designs and embodiments exist for practicing the invention defined in the appended claims.
Claims (19)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/906,940 US20140352279A1 (en) | 2013-05-31 | 2013-05-31 | Exhaust gas treatment system with emission control during filter regeneration |
DE102014107006.2A DE102014107006A1 (en) | 2013-05-31 | 2014-05-19 | Exhaust gas treatment system with emission control during a filter regeneration |
CN201410227708.0A CN104213958A (en) | 2013-05-31 | 2014-05-27 | Exhaust gas treatment system with emission control during filter regeneration |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/906,940 US20140352279A1 (en) | 2013-05-31 | 2013-05-31 | Exhaust gas treatment system with emission control during filter regeneration |
Publications (1)
Publication Number | Publication Date |
---|---|
US20140352279A1 true US20140352279A1 (en) | 2014-12-04 |
Family
ID=51899554
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/906,940 Abandoned US20140352279A1 (en) | 2013-05-31 | 2013-05-31 | Exhaust gas treatment system with emission control during filter regeneration |
Country Status (3)
Country | Link |
---|---|
US (1) | US20140352279A1 (en) |
CN (1) | CN104213958A (en) |
DE (1) | DE102014107006A1 (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160061085A1 (en) * | 2013-03-07 | 2016-03-03 | Isuzu Motors Limited | Control method for exhaust gas aftertreatment device |
US20160216174A1 (en) * | 2015-01-26 | 2016-07-28 | Bosal Emission Control Systems Nv | Device for the diagnosis of the operability of a particle filter for an exhaust gas stream of an internal combustion engine |
US20170009633A1 (en) * | 2014-02-06 | 2017-01-12 | Perkins Engines Company Limited | Heating system for an exhaust gas treatment system |
US20170268400A1 (en) * | 2016-03-15 | 2017-09-21 | Hyundai Motor Company | System and method for preventing failure of exhaust heat recovery device |
CN109183560A (en) * | 2018-08-08 | 2019-01-11 | 三汽车制造有限公司 | The exhaust treatment system of hot-mix plant recycling equipment for asphalt mixture |
US10823030B2 (en) * | 2018-06-11 | 2020-11-03 | Faurecia Emissions Control Technologies, Usa, Llc | Method and apparatus to control valve operation for close coupled SCR |
WO2020226656A1 (en) * | 2019-05-09 | 2020-11-12 | Cummins Emission Solutions Inc. | Valve arrangement for split-flow close-coupled catalyst |
GB2607300A (en) * | 2021-06-01 | 2022-12-07 | Daimler Ag | A method for determining an active regeneration process of a gasoline particulate filter of an exhaust system, as well as an exhaust system |
US11668219B2 (en) * | 2020-09-28 | 2023-06-06 | Nooter/Eriksen, Inc. | System and method for treating process exhaust gas |
IT202100033182A1 (en) * | 2021-12-31 | 2023-07-01 | Marelli Europe Spa | IMPROVED INTERNAL COMBUSTION ENGINE PROVIDED WITH AN EXHAUST GAS HEAT RECOVERY CIRCUIT AND METHOD FOR CONTROL OF SAID ENGINE |
US20230332526A1 (en) * | 2020-09-28 | 2023-10-19 | Nooter/Eriksen, Inc. | System and method for treating gas turbine exhaust gas |
US12031468B2 (en) * | 2023-06-05 | 2024-07-09 | Nooter/Eriksen, Inc. | System and method for treating gas turbine exhaust gas |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9765674B2 (en) * | 2015-09-09 | 2017-09-19 | Cummins Emission Solutions Inc. | Asynchronous reductant insertion in aftertreatment systems |
CN105422227B (en) * | 2015-12-22 | 2018-06-05 | 常熟理工学院 | Heat transfer and the tandem type vehicle exhaust heat-exchanger rig of thermoradiation efficiency superposition |
US9687782B1 (en) * | 2016-02-03 | 2017-06-27 | GM Global Technology Operations LLC | Generation and delivery of ammonia gas in an exhaust gas system |
CN111219234B (en) * | 2016-03-09 | 2022-12-02 | 康明斯排放处理公司 | NOx level determination using reductant mass sensor |
FR3048720B1 (en) * | 2016-03-09 | 2021-02-12 | Continental Automotive France | PROCESS FOR OPTIMIZING THE CONSUMPTION OF REDUCING AGENT IN AN EXHAUST LINE OF A MOTOR VEHICLE |
CN106194360A (en) * | 2016-08-26 | 2016-12-07 | 深圳市贝斯特净化设备有限公司 | A kind of can the device for purifying and treating tail gas of initiative regeneration and diesel vehicle |
GB2554479B (en) * | 2017-02-27 | 2019-02-27 | Rocco Tulino Rosario | Electro-physical apparatus for the activation of nitrogen contained in engines at internal combustion emissions |
DE102018205132A1 (en) * | 2018-04-05 | 2019-10-10 | Robert Bosch Gmbh | Method for operating an exhaust aftertreatment system |
CN109569294A (en) * | 2019-01-31 | 2019-04-05 | 福建鑫泽环保设备工程有限公司 | Magnesite shaft furnace flue gas NO_x Reduction by Effective equipment and its technique |
CN110657012A (en) * | 2019-08-23 | 2020-01-07 | 中国汽车技术研究中心有限公司 | Diesel engine exhaust temperature thermal management system |
CN112502813B (en) * | 2020-11-30 | 2022-04-05 | 潍柴动力股份有限公司 | Engine tail gas treatment device and engine |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060207245A1 (en) * | 2005-03-07 | 2006-09-21 | Denso Corporation | Exhaust gas heat exchanger |
US20070022742A1 (en) * | 2003-06-23 | 2007-02-01 | Isuzu Motors Limited | Exhaust gas cleaning method and exhaust gas cleaning system |
US7272924B2 (en) * | 1998-06-23 | 2007-09-25 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification device of internal combustion engine |
US20110023591A1 (en) * | 2009-07-30 | 2011-02-03 | Ford Global Technologies, Llc | Methods and systems for diagnostics of an emission system with more than one scr region |
US20110173950A1 (en) * | 2009-04-03 | 2011-07-21 | Basf Catalysts Llc | Emissions Treatment System with Ammonia-Generating and SCR Catalysts |
US20120036850A1 (en) * | 2010-08-09 | 2012-02-16 | Cummins Intellectual Properties, Inc. | Waste heat recovery system for recapturing energy after engine aftertreatment systems |
US20120180463A1 (en) * | 2009-10-21 | 2012-07-19 | Yarmar Co., Ltd. | Diesel engine |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7229597B2 (en) * | 2003-08-05 | 2007-06-12 | Basfd Catalysts Llc | Catalyzed SCR filter and emission treatment system |
US7886529B2 (en) * | 2007-05-30 | 2011-02-15 | Gm Global Technology Operations, Inc. | Electrically heated DPF/SCR 2-way system |
US7966812B2 (en) * | 2007-08-29 | 2011-06-28 | Ford Global Technologies, Llc | Multi-stage regeneration of particulate filter |
US8621854B2 (en) * | 2010-06-29 | 2014-01-07 | GM Global Technology Operations LLC | System and method for determining an age of and controlling a selective catalytic reduction catalyst |
-
2013
- 2013-05-31 US US13/906,940 patent/US20140352279A1/en not_active Abandoned
-
2014
- 2014-05-19 DE DE102014107006.2A patent/DE102014107006A1/en not_active Withdrawn
- 2014-05-27 CN CN201410227708.0A patent/CN104213958A/en active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7272924B2 (en) * | 1998-06-23 | 2007-09-25 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification device of internal combustion engine |
US20070022742A1 (en) * | 2003-06-23 | 2007-02-01 | Isuzu Motors Limited | Exhaust gas cleaning method and exhaust gas cleaning system |
US20060207245A1 (en) * | 2005-03-07 | 2006-09-21 | Denso Corporation | Exhaust gas heat exchanger |
US20110173950A1 (en) * | 2009-04-03 | 2011-07-21 | Basf Catalysts Llc | Emissions Treatment System with Ammonia-Generating and SCR Catalysts |
US20110023591A1 (en) * | 2009-07-30 | 2011-02-03 | Ford Global Technologies, Llc | Methods and systems for diagnostics of an emission system with more than one scr region |
US20120180463A1 (en) * | 2009-10-21 | 2012-07-19 | Yarmar Co., Ltd. | Diesel engine |
US20120036850A1 (en) * | 2010-08-09 | 2012-02-16 | Cummins Intellectual Properties, Inc. | Waste heat recovery system for recapturing energy after engine aftertreatment systems |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160061085A1 (en) * | 2013-03-07 | 2016-03-03 | Isuzu Motors Limited | Control method for exhaust gas aftertreatment device |
US9562463B2 (en) * | 2013-03-07 | 2017-02-07 | Isuzu Motors Limited | Control method for exhaust gas aftertreatment device |
US20170009633A1 (en) * | 2014-02-06 | 2017-01-12 | Perkins Engines Company Limited | Heating system for an exhaust gas treatment system |
US10082065B2 (en) * | 2014-02-06 | 2018-09-25 | Perkins Engines Company Limited | Heating system for an exhaust gas treatment system |
US20160216174A1 (en) * | 2015-01-26 | 2016-07-28 | Bosal Emission Control Systems Nv | Device for the diagnosis of the operability of a particle filter for an exhaust gas stream of an internal combustion engine |
US20170268400A1 (en) * | 2016-03-15 | 2017-09-21 | Hyundai Motor Company | System and method for preventing failure of exhaust heat recovery device |
US10087809B2 (en) * | 2016-03-15 | 2018-10-02 | Hyundai Motor Company | System and method for preventing failure of exhaust heat recovery device |
US10823030B2 (en) * | 2018-06-11 | 2020-11-03 | Faurecia Emissions Control Technologies, Usa, Llc | Method and apparatus to control valve operation for close coupled SCR |
CN109183560A (en) * | 2018-08-08 | 2019-01-11 | 三汽车制造有限公司 | The exhaust treatment system of hot-mix plant recycling equipment for asphalt mixture |
CN113924408A (en) * | 2019-05-09 | 2022-01-11 | 康明斯排放处理公司 | Valve device for split-flow type close connection catalyst |
WO2020226656A1 (en) * | 2019-05-09 | 2020-11-12 | Cummins Emission Solutions Inc. | Valve arrangement for split-flow close-coupled catalyst |
GB2597182A (en) * | 2019-05-09 | 2022-01-19 | Cummins Emission Solutions Inc | Valve arrangement for split-flow close-coupled catalyst |
GB2597182B (en) * | 2019-05-09 | 2023-11-22 | Cummins Emission Solutions Inc | Valve arrangement for split-flow close-coupled catalyst |
US11867111B2 (en) | 2019-05-09 | 2024-01-09 | Cummins Emission Solutions Inc. | Valve arrangement for split-flow close-coupled catalyst |
US11668219B2 (en) * | 2020-09-28 | 2023-06-06 | Nooter/Eriksen, Inc. | System and method for treating process exhaust gas |
US20230332526A1 (en) * | 2020-09-28 | 2023-10-19 | Nooter/Eriksen, Inc. | System and method for treating gas turbine exhaust gas |
GB2607300A (en) * | 2021-06-01 | 2022-12-07 | Daimler Ag | A method for determining an active regeneration process of a gasoline particulate filter of an exhaust system, as well as an exhaust system |
IT202100033182A1 (en) * | 2021-12-31 | 2023-07-01 | Marelli Europe Spa | IMPROVED INTERNAL COMBUSTION ENGINE PROVIDED WITH AN EXHAUST GAS HEAT RECOVERY CIRCUIT AND METHOD FOR CONTROL OF SAID ENGINE |
EP4206444A1 (en) | 2021-12-31 | 2023-07-05 | Marelli Europe S.p.A. | Improved internal combustion engine provided with an exhaust gas heat recovery system and method to control said engine |
US12031468B2 (en) * | 2023-06-05 | 2024-07-09 | Nooter/Eriksen, Inc. | System and method for treating gas turbine exhaust gas |
Also Published As
Publication number | Publication date |
---|---|
CN104213958A (en) | 2014-12-17 |
DE102014107006A1 (en) | 2014-12-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20140352279A1 (en) | Exhaust gas treatment system with emission control during filter regeneration | |
US9687782B1 (en) | Generation and delivery of ammonia gas in an exhaust gas system | |
US7799289B2 (en) | Exhaust treatment system with NO2 control | |
US10113465B2 (en) | Systems and methods to reduce reductant consumption in exhaust aftertreatment systems | |
US8166751B2 (en) | Particulate filter | |
US9656210B2 (en) | Internal combustion engine | |
US20090035194A1 (en) | Exhaust treatment system with an oxidation device for NO2 control | |
EP3192991B1 (en) | Method of heating an exhaust gas in an exhaust aftertreatment system | |
US20090205322A1 (en) | Exhaust Gas Aftertreatment System and Exhaust Gas Cleaning Method | |
US8910466B2 (en) | Exhaust aftertreatment system with diagnostic delay | |
EP2770178B1 (en) | System and method for sulfur recovery on an SCR catalyst | |
US20120258015A1 (en) | Exhaust treatment system for an internal combustion engine | |
US9222389B2 (en) | Systems and methods for controlling reductant delivery to an exhaust stream | |
US9016047B2 (en) | System and method for exhaust gas aftertreatment | |
CN108060957B (en) | Exhaust aftertreatment device conversion efficiency optimization | |
CN104838100B (en) | The emission control system of internal combustion engine | |
US9046019B2 (en) | System and method for particulate filter regeneration | |
US20140311122A1 (en) | Flow controlled electrically assisted dpf regeneration | |
US10288017B1 (en) | Model based control to manage eDOC temperature | |
JP2021076047A (en) | Exhaust emission control device | |
US11834977B2 (en) | Method for heating an exhaust system | |
Robel et al. | Exhaust treatment system with NO 2 control | |
JP2022054610A (en) | Reducer supply device | |
JP2021124043A (en) | Control device for exhaust emission control device, exhaust emission control device and vehicle | |
Gupta et al. | Systems and methods to mitigate NO x and HC emissions |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: GM GLOBAL TECHNOLOGY OPERATIONS LLC, MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GONZE, EUGENE V.;PARATORE, MICHAEL J., JR.;BEDFORD, JOSHUA CLIFFORD;SIGNING DATES FROM 20130523 TO 20130528;REEL/FRAME:030549/0351 |
|
AS | Assignment |
Owner name: WILMINGTON TRUST COMPANY, DELAWARE Free format text: SECURITY INTEREST;ASSIGNOR:GM GLOBAL TECHNOLOGY OPERATIONS LLC;REEL/FRAME:033135/0336 Effective date: 20101027 |
|
AS | Assignment |
Owner name: GM GLOBAL TECHNOLOGY OPERATIONS LLC, MICHIGAN Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:WILMINGTON TRUST COMPANY;REEL/FRAME:034287/0601 Effective date: 20141017 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |