CN104213958A - Exhaust gas treatment system with emission control during filter regeneration - Google Patents
Exhaust gas treatment system with emission control during filter regeneration Download PDFInfo
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- CN104213958A CN104213958A CN201410227708.0A CN201410227708A CN104213958A CN 104213958 A CN104213958 A CN 104213958A CN 201410227708 A CN201410227708 A CN 201410227708A CN 104213958 A CN104213958 A CN 104213958A
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- exhaust
- particulate filter
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Classifications
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
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- 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
Abstract
An exhaust gas treatment system for an engine includes an exhaust gas inlet tube configured to receive an 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 particulate filter is configured to undergo thermal regeneration when the exhaust gas in the particulate filter is heated above a regeneration temperature. The controller is configured to control a temperature difference, between a present temperature of the second SCR device and a predefined optimal second SCR temperature, to be within a predefined threshold during the thermal regeneration of the particulate filter. The controller may be configured to direct an injector to inject a reductant into the first SCR device when the temperature difference is below the predefined threshold, thereby controlling a NOx emission in the exhaust gas.
Description
Technical field
The present invention relates generally to for the exhaust-gas treatment system of vehicle and the method for controlling exhaust-gas treatment system.
Background technique
Many effulents produced by explosive motor, various nitrogen oxide, are jointly called NOx gas herein.NOx gas enters when nitrogen in air and oxygen molecule are exposed under the high temperature of burning and is formed being present in motor.Exhaust-gas treatment system is used in vehicle, so that the NOx gas reducing and formed in process combustion process.Exhaust-gas treatment system uses selective catalytic reduction (selective catalytic reduction:SCR) device usually, its reducing agent using such as ammonia such, its can combine with unnecessary oxygen and with NOx gas reaction, to reduce NOx gas.
Exhaust-gas treatment system also uses particulate filter, the particle produced by motor or particulate matter to be filtered out.At regular intervals, particulate filter must by hot recycling, so that the particle of removing accumulation.Along with particulate filter temperature increases, the temperature of SCR device also increases, and makes ammonia from SCR device desorption.Ammonia can be oxidized to form NOx gas through particulate filter, increases NOx emission thing thus during the hot recycling of particulate filter.
Summary of the invention
For generation of an exhaust-gas treatment system for the motor of exhaust, comprise and be configured to receive the exhaust inlet pipe from the exhaust of motor.Particulate filter, heat exchange series the first and second selective catalytic reduction (SCR) device of unifying is communicated with exhaust entrance pipe fluid.Heat-exchange system is positioned at the downstream of particulate filter.First and second SCR device are positioned at the upstream and downstream of heat-exchange system respectively.Hot recycling is experienced when the particulate filter exhaust be configured in particulate filter is heated to more than regeneration temperature.First temperature transducer is operatively connected to the second SCR device and is configured to determine the current 2nd SCR temperature (T of the second SCR device
s2).Controller is operatively connected to the first temperature transducer and is configured to determine whether hot recycling occurs in particulate filter.Controller is configured to current 2nd SCR temperature (T during the hot recycling of particulate filter
s2) and predetermined the best the 2nd SCR temperature (T
o) between temperature difference (T
s2– T
o) control within predetermined threshold.
Sparger is operatively connected to the first SCR device and is configured to optionally be mapped in the first SCR device by injection of reducing agent.Reducing agent is configured to advance to the second SCR device.Controller can be configured at temperature difference (T
s2– T
o) lower than indicating the agent of sparger injection reduction during predetermined threshold, the NOx emission during controlling particulate filter hot recycling thus in exhaust.In one example in which, predetermined the best the 2nd SCR temperature (T
o) be about 200 to 220 degrees Celsius.In another example, predetermined the best the 2nd SCR temperature (T
o) be about 220 degrees Celsius and predetermined threshold is about 10 ° degrees Celsius.
Controller is configured to temperature difference (T
s2– T
o) control to comprise within predetermined threshold: at temperature difference (T
s2– T
o) higher than heat-exchange system transmission will be indicated during predetermined threshold to carry out self-purging heat.Thus, exhaust-gas treatment system uses heat-exchange system to control the current 2nd SCR temperature (T of the second SCR device during particulate filter hot recycling
s2).
First and second pressure transducers can be positioned at the upstream and downstream of particulate filter respectively.First and second pressure transducers are configured to determine the differential pressure through particulate filter.Controller can be configured to pass determines when the differential pressure through particulate filter determines whether hot recycling occurs in particulate filter higher than predetermined threshold pressure.
Second temperature transducer is operatively connected to particulate filter and is configured to determine the current filter actuator temperature (T of particulate filter
f).Controller can be configured to pass the current filter actuator temperature (T determining particulate filter at a predetermined temperature
f) whether have passed through the time of prearranging quatity and determined whether hot recycling occurs in particulate filter.In one example in which, the time of prearranging quatity is 30 minutes and predetermined temperature is 550 degrees Celsius.
First SCR device can comprise the first catalyzer and particulate filter can comprise multiple passages with respective wall.First SCR device and particulate filter can be arranged in common housing, thus the first catalyzer is painted in the respective wall of multiple passages of particulate filter.First and second NOx sensor can be positioned at the upstream and downstream of particulate filter respectively.First and second NOx sensor are configured to determine the respective amount of NOx in the exhaust of particulate filter upstream and downstream.
Heat-exchange system can include notch portion, and it is configured to receive the exhaust from particulate filter.The exit portion of heat-exchange system is configured to exhaust to be delivered to the second SCR device.Internal cavities connects entrance and exit portion and limits centre gangway and bypass passageways.Heat-exchange device to be positioned in bypass passageways and to be configured to transmit self-purging heat.
Bypass valve is optionally movable between multiple position, optionally to allow exhaust to enter the second SCR device, to comprise the first portion from centre gangway and the second portion from bypass passageways.Bypass valve can be positioned as making at temperature difference (T
s2– T
o) be about 100% lower than first portion during predetermined threshold and second portion is about 0%.Bypass valve can be positioned as making at temperature difference (T
s2– T
o) be about 60% higher than first portion during predetermined threshold and second portion is about 40%.
Coolant circuit is operably connected to heat-exchange system, thus heat-exchange device is configured to, and optionally future, self-purging heat was delivered to coolant circuit.A kind of method for controlling exhaust-gas treatment system operation is provided.
Above-mentioned the features and advantages of the present invention and other feature and advantage easily can be understood in the detailed description that enforcement better model of the present invention is made hereafter carried out by reference to the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of exemplary exhaust treatment system and the controller using algorithm described herein.
Fig. 2 is the indicative flowchart for the algorithm or method controlling exhaust-gas treatment system as shown in Figure 1; With
Fig. 3 is the perspective schematic view of the exemplary hot switch that can be used in the exhaust-gas treatment system of Fig. 1.
Embodiment
See accompanying drawing, wherein in a few width figure, identical reference character indicates same or similar parts, and as shown in Figure 1, it has the motor 12 producing exhaust 14 to a part for vehicle 10.In one example in which, motor 12 is diesel engine.But the present invention is applicable to the motor of any type.Vehicle 10 comprises exhaust-gas treatment system 16, and it is for the treatment of the composition in exhaust 14, such as nitrogen oxide (NOx).Exhaust inlet pipe 18 is communicated with exhaust 14 fluid from motor 12 and is configured to receive the exhaust from motor.
See Fig. 1, processing system 16 comprises the particulate filter 20 be communicated with exhaust inlet pipe 18 fluid.Heat-exchange system 22 is communicated with exhaust inlet pipe 18 fluid and is positioned at the downstream of particulate filter 20.First selective catalytic reduction (SCR) device 24 is communicated with exhaust inlet pipe 18 fluid, and is positioned at the upstream of heat-exchange system 22.Second selective catalytic reduction (SCR) device 26 is communicated with exhaust inlet pipe 18 fluid, and is positioned at the downstream of heat-exchange system 22.First and second SCR device 24,26 objects are by changing nitrogen and water vapor into and the nitrogen oxide (NOx) reduced in exhaust 14.First and second SCR device 24,26 use reducing agent 28, and it can react with the NOx combined with unnecessary oxygen.Reducing agent 28 can be urea, ammonia, ammonia precursor or any other suitable material.In one example in which, reducing agent 28 is diesel exhaust fluid (diesel exhaust fluid:DEF).
See Fig. 1, sparger 29 is operatively connected to the first SCR device 24 and is configured to optionally reducing agent 28 is ejected into the first SCR device 24.Reducing agent 28 is configured to pass particulate filter 20 and heat-exchange system 22 and advances to the second SCR device 26.Alternatively, the second sparger (not shown) is operably connected to the second SCR device 26 and is configured to reducing agent 28 to be ejected into the second SCR device 26.
See Fig. 1, mixer 30 can be connected to exhaust inlet pipe 18 by fluid.Mixer 30 can orientate next-door neighbour's sparger 29 as, mixes with the straight-through of exhaust 14 to make reducing agent 28.Mixer 30 can comprise machine-direction oriented passage, and described passage allows exhaust 14 and reducing agent 28 at the forward slip value entering the first SCR device 24.
NOx reduction reaction is there is through first and second SCR device 24,26 time in exhaust 14.See Fig. 1, the second SCR device 26 comprises carrier or matrix 34, and it is immersed in the washcoat (washcoat) containing active catalyst component, is called the second catalyzer 36 herein.Second catalyzer 36 is painted on matrix 34.Second catalyzer 36 can be the oxide of zeolite and alkali metal (such as vanadium, molybdenum, tungsten).In one example in which, the second catalyzer 36 is iron or copper exchange type zeolite (iron-or copper-exchanged zeolite).In order to efficiency is maximum, in the second SCR device 26, the second catalyzer 36 needs optimum temperature.Matrix 34 is configured to increase the surface area that can be used for the second catalyzer 36 coating.Matrix 34 can comprise ceramic honeycomb block, metal or any other suitable material.Matrix 34 can install in container 38 subsequently with metal or mineral " pad (mat) " (not shown).Container 38 can be stainless cylinder of steel.Any matrix 34 can be used in the second SCR device 26.
Particulate filter 20 filters out for the particle that produced by motor 12 or particulate matter.These particles can comprise coal smoke, hydrocarbon, cigarette ash and sulfuric acid.To see Fig. 1, particulate filter 20 can comprise multiple passage 40, and it is single-ended and has corresponding porous wall.Exhaust 14 is advanced through the porous wall of passage 40, as shown in arrow 42, leaves the particle be filtered on the wall of passage 40.Passage 40 can comprise pottery or any other suitable material.
See Fig. 1, the first SCR device 24 comprises active catalyst component, is called the first catalyzer 44 herein.First catalyzer 44 can be the oxide of zeolite and alkali metal (such as vanadium, molybdenum, tungsten).In one example in which, the first catalyzer 44 is copper exchange type zeolites.First SCR device 24 and particulate filter 20 can be arranged in common housing 46, thus the first catalyzer 44 is painted in the respective wall of passage 40 of particulate filter 20.
Exhaust-gas treatment system 16 is included in one or more sensors of various position, for the temperature of sensing system 16, pressure and other performances.See Fig. 1, the first temperature transducer 48 is operatively connected to the second SCR device 26 and is configured to determine that the Current Temperatures of the second SCR device 26 (is called " current 2nd SCR temperature T herein
s2").Second temperature transducer 50 is operatively connected to particulate filter 20 and is configured to determine the current filter actuator temperature (T of particulate filter 20
f).First and second NOx sensor 52,53 can be positioned at the upstream and downstream of particulate filter 20 respectively.First and second NOx sensor 52,53 are configured to determine the respective amount of NOx in the exhaust 14 of particulate filter 20 upstream and downstream.First and second pressure transducers 54,56 can be positioned at the upstream and downstream of particulate filter 20 respectively.First and second pressure transducers 54,56 are configured to determine the differential pressure through particulate filter 20.
See Fig. 1, exhaust-gas treatment system 16 can comprise oxidation catalyzer 58.Oxidation catalyzer 58 is positioned at the upstream of particulate filter 20.The first SCR device 24 is entered through oxidation catalyzer 58 from the exhaust 14 of motor 12.NO (nitrous oxide) gas is converted to NO by oxidation catalyzer 58
2, it is easily processed in the first SCR device 24.Oxidation catalyzer 58 is also by will be other compounds and eliminate described sulfur derivatives and other compounds from some sulfur derivatives of exhaust 14 and other compound oxidations.When the hydrocarbon emissions in exhaust 14 is oxidized by oxidation catalyzer 58, the releases heat due to the characteristic exotherm of reaction.This heat may be used for the regeneration realizing particulate filter 20 as described below.
Particulate filter 20 must regenerate at regular intervals, so that the particle of removing accumulation.Experience hot recycling when particulate filter 20 exhaust 14 be configured in particulate filter 20 is heated to more than regeneration or combustion temperature, allows particle burning thus or lights.In one example in which, regeneration temperature is between 600-750 DEG C.Any appropriate method performing regeneration can be adopted, include but not limited to use fuel burner, use resistance heating coil and use microwave energy.Along with particulate filter temperature increases, the temperature of the first SCR device 24 also increases, and causes reducing agent 28 (such as ammonia) from the first SCR device 24 desorption.Ammonia can be oxidized through particulate filter 20, to form NOx gas (various nitrogen oxide), increases NOx emission thus during the hot recycling of particulate filter 20.
See Fig. 1, controller 60 is operatively connected to the miscellaneous part of motor 12 and vehicle 10.Controller 60 is configured to during the hot recycling of particulate filter 20, make the NOx emission in exhaust 14 minimize.Controller 60 realizes this point by execution algorithm 200, and described algorithm is present in controller 60 or is easy to otherwise be performed by controller 60.Controller 60 can based on microprocessor, such as computer, and it has central processing unit, storage (RAM and/or ROM) and relevant input and output bus.Controller 60 can be that specific integrated circuit maybe can be formed by other logic device known in the art.Controller 60 can be central vehicle main control unit (such as engine control module (ECM), interactive vehicle dynamic module, main control module, there is the control circuit of power supply) a part or be combined to single integration control module in can be maybe independently control module.
With reference to figure 2, the execution of algorithm 200 is hereafter being described.Beginning and exit function are marked as " S " and " E " in fig. 2 respectively.Should be understood that controller 60 can eliminate one or more step or can with not order determination step as above.Algorithm 200 can start in step 202, and wherein the controller 60 of Fig. 1 determines whether hot recycling occurs in particulate filter 20.This can realize in many ways.In one embodiment, controller 60 can be configured to pass and determine when the differential pressure (as determined by the first and second pressure transducers 54,56 as shown in Figure 1) through particulate filter 20 determines whether hot recycling occurs in particulate filter 20 higher than predetermined threshold pressure.In one example in which, predetermined threshold pressure can for the load being about 4-5g/L.
In another embodiment, controller 60 can be configured to pass the current filter actuator temperature (T determining particulate filter 20 at a predetermined temperature
f) whether (as determined by the second temperature transducer 50 as shown in Figure 1) have passed through the time of prearranging quatity and determined whether hot recycling occurs in particulate filter 20.In one example in which, the time of prearranging quatity is 30 minutes and predetermined temperature is 550 degrees Celsius.Any other suitable method determining when hot recycling occurs can be adopted.
If hot recycling does not occur, then algorithm 200 exits, as shown in line 210.If hot recycling occurs, then algorithm 200 proceeds to step 204.In the step 204 of Fig. 2, during the hot recycling of particulate filter 20, controller 60 is by the current 2nd SCR temperature (T of the second SCR device 26
s2) and predetermined best SCR temperature (T
o) between temperature difference (T
s2– T
o) control as within being in predetermined threshold.This can realize via sub-step 204A-C as described below.
In sub-step 204A, controller 60 determines the current 2nd SCR temperature (T of the second SCR device 26 based on the first temperature transducer 48 being operatively connected to the second SCR device 26
s2).In the sub-step 204B of Fig. 2, controller 60 determines temperature difference (T
s2– T
o) higher than or lower than predetermined threshold.
At sub-step 204C, at temperature difference (T
s2– T
o) higher than predetermined threshold time, controller 60 indicates heat-exchange system 22 to transmit heat from exhaust 14.In one example in which, predetermined the best the 2nd SCR temperature (T
o) be about 200 to 220 degrees Celsius.In another example, predetermined the best the 2nd SCR temperature (T
o) be about 220 degrees Celsius and predetermined threshold is about 10 degrees Celsius.In this case, if current 2nd SCR temperature (T
s2) higher than 230 degrees Celsius, then controller 60 indicates heat-exchange system 22 to transmit heat from exhaust 14, until current 2nd SCR temperature (T
s2) be in best 2nd SCR temperature (T
o) the scope of about 10 ° degrees Celsius in, or (T
s2– T
o) <10.
Thus, exhaust-gas treatment system 16 uses heat-exchange system 22 to maintain the optimum temperature of the second SCR device 26 during the hot recycling of particulate filter 20.As shown in line 206, algorithm 200 gets back to step 204, until temperature difference (T
s2– T
o) no longer higher than predetermined threshold.
In the step 208 of Fig. 2, at temperature difference (T
s2– T
o) lower than predetermined threshold time, controller 60 indicates sparger 29 injection reduction agent 28, to control the NOx emission in exhaust 14.Reducing agent 28 is configured to advance to the second SCR device 26, under this is in the help of the second catalyzer 36, NOx reduction reaction occurs, and reduces the NOx emission in exhaust 14 thus.
Controller 60 can determine the amount of the reducing agent 28 wanting injected device 29 to spray based on some blocking factors.Factor can include but not limited to respective amount, the current 2nd SCR temperature (T of NOx in particulate filter 20 upstream and downstream exhaust 14
s2), the extraction flow at the amount of the first and second catalyzer 44,36 respectively in the first and second SCR device 24,26 and exhaust inlet pipe 18 place of motor 12.
See Fig. 1, heat-exchange system 22 can be the part of vehicle exhaust heat recovery (EGHR) system or its can be mounted in independent unit in vehicle 10.Heat-exchange system 22 can include notch portion 62, and it is configured to receive the exhaust 14 from particulate filter 20.The exit portion 64 of heat-exchange system 22 is configured to exhaust 14 to be delivered to the second SCR device 26.Internal cavities 66 connects entrance and exit portion 62,64 and limits centre gangway 68 and bypass passageways 70.
See Fig. 1, heat-exchange system 22 comprises the heat-exchange device 72 be positioned in bypass passageways 70.It is heat sink that heat-exchange device 72 is used as in heat-exchange system 22, and be configured to transmit the heat from the exhaust 14 being advanced through bypass passageways 70.Bypass valve 74 controls the flowing of the exhaust 14 through heat-exchange device 72.Bypass valve 74 can move in response to the control signal carrying out self-controller 60.Bypass valve 74 can be in directly solenoid, mechanical thermostat, wax motor, vacuum actuator or other suitable control devices control.
See Fig. 1, bypass valve 74 is optionally movable between multiple position (such as 76A, B and C), optionally to allow exhaust 14 to enter the second SCR device 26, to comprise the first portion 78 from centre gangway 68 and the second portion 80 from bypass passageways 70.First and second parts 78,80 can any position between 0 to 100% of exhaust 14 total amount.Controller 60 can at temperature difference (T
s2– T
o) lower than indicating bypass valve 74 to reach primary importance 76A during predetermined threshold.In primary importance 76A, first portion 78 can be about 100% and second portion 80 can be approximately 0%, is namely only allowed to enter the second SCR device 26 from the exhaust 14 of centre gangway 68.
Controller 60 can at temperature difference (T
s2– T
o) higher than indicating bypass valve 74 to reach the second place 76B during predetermined threshold.In second place 76B, first portion 78 can be about 60% and second portion 80 can be about 40%.Controller 60 also can indicate bypass valve 74 to reach the 3rd position 76C, and in this position, first portion 78 is about 0% and second portion 80 is about 100%.As shown in Figure 1, bypass valve 74 can be positioned at exit portion 64 place.Bypass valve 74 also can be positioned at intake section 62 place.The range of movement of bypass valve 74 can change based on current embody rule.
See Fig. 1, heat-exchange system 22 is configured to heat to be delivered to coolant circuit 82 from exhaust 14, makes the freezing mixture 84 in coolant circuit 82 heat thus.Freezing mixture 84 can flow into respectively by freezing mixture entry port 86 and freezing mixture output port 88 and flow out heat-exchange system 22.Coolant circuit 82 is configured to connecting engine 12 and heat-exchange system 22.Coolant circuit 82 is merged in the main pump 90 supplied with pressurized freezing mixture 84 in motor 12.Main pump 90 can be the mechanical pump of the rotary actuation by engine crankshaft (not shown).Service pump 92 may be used for increasing pressure and increasing the flowing flowing through coolant circuit 82.Service pump 92 may be used for main pump 90 make supplement or can in any case (such as when motor 12 and main pump 90 do not run) as unique pump.
Coolant circuit 82 can between various vehicle component transferring heat, comprise motor 12, vent systems 16, heater cores 94 and transmission for vehicles (not shown).Heater cores 94 allows heat to be delivered to the passenger carriage (not shown) of vehicle 10 from the freezing mixture 84 leaving motor 12.Coolant circuit 82 can comprise heater cores by-pass portion 98, and it is parallel with heater cores 94, and heater cores bypass valve 96 is configured to the flowing of controlled cooling model agent 84 through heater cores 94 and heater cores by-pass portion 98.Coolant circuit 82 can comprise flow limiter, such as limiter 99, and it is placed in the various positions in loop 82.Vehicle 10 can comprise various miscellaneous part well known by persons skilled in the art, includes but not limited to, radiator, speed changer heat exchanger and thermostat (not shown).
Fig. 3 is the perspective schematic view of exemplary hot switch 72, and it can be used in the exhaust-gas treatment system 16 of Fig. 1.See Fig. 3, heat-exchange device 72 can comprise multiple plate 102, has corresponding space 104 between plate 102.Additional space 104 is defined for the first flow path of exhaust 14.Each plate 102 can comprise one or more corresponding conduit 106A, B, C and D.See Fig. 3, corresponding conduit 106A-D can arrange as assembling corresponding pipe 108A-D, and described pipe is configured to for allowing freezing mixture 84 flow.In each plate 102, the position of conduit and quantity can change based on current embody rule.Plate 102 and pipe 108A-D can comprise pleated portions, to improve the efficiency of heat trnasfer.Device is as shown in Figure 3 an example, and can adopt the device of any suitable type well known by persons skilled in the art.
The controller 60 of Fig. 1 can comprise computing device, and described computing device adopts operation system or processor, for storage and the executable instruction of execution computer.Computer executable instructions from computer program compiling or can be understood, and it uses various programming language and/or technology to be formed, and includes but not limited to (alone or in combination) Java
tM, C, C++, Visual Basic, Java Script, Perl etc.Usually, processor (such as microprocessor) receives instruction, such as, from storage, and computer-readable medium etc., and perform these instructions, perform one or more process thus, comprise one or more process as herein described.This instruction and other data can use various computer-readable medium to store and transmit.Computer-readable medium (being also called processor readable medium) comprises any non-momentary (such as entity) medium, is implemented as the data (such as instruction) providing and can be read by computer (such as by the processor of computer).This medium can take much formation, includes but not limited to, non-volatile media and volatile medium.Non-volatile media can comprise such as CD or disk and other permanent memories.Volatile medium can comprise such as dynamic RAM (DRAM), and it can form main memory.This instruction can one or more Transfer Medium transmission, comprises coaxial cable, copper conductor and optical fiber, comprises the wire containing the system bus being connected to computer processor.The computer-readable medium of some forms comprises such as floppy disk, flexible disk, hard disk, tape, any other medium, any other optical medium of CD-ROM, DVD, punch card, paper tape, any other physical medium with hole pattern, RAM, PROM, EPROM, FLASH-EEPROM, any other storage chip or cassette tape or any other medium computer-readable.
Detailed description in accompanying drawing and display are to support of the present invention and description, and scope of the present invention limits by means of only claim.But although detailed description those skilled in the art are carried out to execution better model of the present invention can learn that being used in the scope of appended claim implements many replacement design and implementation examples of the present invention.
Claims (10)
1., for generation of an exhaust-gas treatment system for the motor of exhaust, this system comprises:
Exhaust inlet pipe, is configured to receive exhaust;
Particulate filter, be communicated with exhaust entrance pipe fluid and the exhaust be configured in particulate filter is heated to more than regeneration temperature time experience hot recycling;
Heat-exchange system, is communicated with exhaust entrance pipe fluid and is positioned at the downstream of particulate filter;
First selective catalytic reduction (SCR) device, is communicated with exhaust entrance pipe fluid and is positioned at the upstream of heat-exchange system;
Second selective catalytic reduction (SCR) device, is communicated with exhaust entrance pipe fluid and is positioned at the downstream of heat-exchange system;
First temperature transducer, is operatively connected to the second SCR device and is configured to determine the current 2nd SCR temperature (T of the second SCR device
s2);
Controller, is operatively connected to the first temperature transducer and is configured to determine whether hot recycling occurs in particulate filter; With
Wherein, controller during the hot recycling of particulate filter by current 2nd SCR temperature (T
s2) and predetermined the best the 2nd SCR temperature (T
o) between temperature difference (T
s2– T
o) control within predetermined threshold.
2. exhaust-gas treatment system as claimed in claim 1, comprises further:
Sparger, be operatively connected to the first SCR device and be configured to optionally injection reduction agent in the first SCR device, reducing agent is configured to advance to the second SCR device; With
Wherein, controller is configured at temperature difference (T
s2– T
o) lower than indicating the agent of sparger injection reduction during predetermined threshold, control the discharge of NOx in exhaust thus.
3. exhaust-gas treatment system as claimed in claim 1, wherein, controller is configured to temperature difference (T
s2– T
o) control this operation within predetermined threshold and comprise:
Controller is configured at temperature difference (T
s2– T
o) higher than indicating heat-exchange system transmission to carry out self-purging heat during predetermined threshold.
4. exhaust-gas treatment system as claimed in claim 1, comprises further:
First and second pressure transducers, are positioned at the upstream and downstream of particulate filter respectively, and are configured to determine the differential pressure through particulate filter; With
Its middle controller is configured to pass determines when the differential pressure through particulate filter determines whether hot recycling occurs in particulate filter higher than predetermined threshold pressure.
5. exhaust-gas treatment system as claimed in claim 1, wherein:
First SCR device comprises the first catalyzer;
Particulate filter comprises multiple passages with respective wall; With
First SCR device and particulate filter are arranged in common housing, thus the first catalyzer is painted in the respective wall of multiple passages of particulate filter.
6. exhaust-gas treatment system as claimed in claim 1, wherein heat-exchange system comprises:
Intake section, is configured to receive the exhaust from particulate filter;
Exit portion, is configured to exhaust to be delivered to the second SCR device;
Internal cavities, connects entrance and exit portion and limits centre gangway and bypass passageways;
Heat-exchange device, to be positioned in bypass passageways and to be configured to transmit self-purging heat; With
Bypass valve, optionally movable between multiple position, optionally to allow exhaust to enter the second SCR device, to comprise the first portion from centre gangway and the second portion from bypass passageways.
7. exhaust-gas treatment system as claimed in claim 6, wherein bypass valve is orientated as and is made at temperature difference (T
s2– T
o) be about 60% higher than first portion described during predetermined threshold and described second portion is about 40%.
8. a vehicle, comprising:
Motor;
Exhaust inlet pipe, is communicated with the exhaust fluid from motor and is configured to receive the exhaust from motor;
Particulate filter, be communicated with exhaust entrance pipe fluid and the exhaust be configured in particulate filter is heated to more than regeneration temperature time experience hot recycling;
Heat-exchange system, is communicated with exhaust entrance pipe fluid and is positioned at the downstream of particulate filter;
First selective catalytic reduction (SCR) device, is communicated with exhaust entrance pipe fluid and is positioned at the upstream of heat-exchange system;
Second selective catalytic reduction (SCR) device, is communicated with exhaust entrance pipe fluid and is positioned at the downstream of heat-exchange system;
Sparger, be operatively connected to the first SCR device and be configured to optionally injection reduction agent in the first SCR device, reducing agent is configured to advance to the second SCR device;
First temperature transducer, is operatively connected to the second SCR device and is configured to determine the Current Temperatures of the second SCR device;
Controller, is operatively connected to the first temperature transducer and is configured to determine whether hot recycling occurs in particulate filter;
Wherein, controller is configured to current 2nd SCR temperature (T during the hot recycling of particulate filter
s2) and predetermined the best the 2nd SCR temperature (T
o) between temperature difference (T
s2– T
o) control within predetermined threshold; With
Wherein, controller is configured to indicate the agent of sparger injection reduction in temperature difference lower than during predetermined threshold, controls the discharge of NOx in exhaust thus.
9., for controlling a method for the operation of the exhaust-gas treatment system produced in the motor of exhaust, described method comprises:
Operatively exhaust inlet pipe is connected to motor, for receiving exhaust;
Operatively particulate filter is connected for be communicated with exhaust entrance pipe fluid with heat-exchange system, when the particulate filter exhaust be configured in particulate filter is heated to more than regeneration temperature, experiences hot recycling;
Operatively connect the first and second selective catalytic reduction (SCR) device for be communicated with exhaust entrance pipe fluid, the first and second SCR device are positioned at the upstream and downstream of heat-exchange system respectively;
Operatively sparger is connected to the first SCR device, for being optionally mapped to by injection of reducing agent in the first SCR device;
Detect in particulate filter and when hot recycling occurs;
During the hot recycling of particulate filter, the temperature difference between current SCR temperature and predetermined best SCR temperature is controlled within predetermined threshold; With
In temperature difference lower than indicating the agent of sparger injection reduction during predetermined threshold, control the NOx emission in exhaust thus.
10. method as claimed in claim 9, wherein controls temperature difference, within predetermined threshold, to comprise during the hot recycling of particulate filter:
The current 2nd SCR temperature of the second SCR device is determined based on the first temperature transducer being operatively connected to the second SCR device;
Determine when there is hot recycling in particulate filter temperature difference between current SCR temperature and predetermined best SCR temperature higher than or lower than predetermined threshold; With
Self-purging heat is carried out higher than indicating heat-exchange system transmission during predetermined threshold in temperature difference.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/906,940 | 2013-05-31 | ||
| 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 |
|---|---|
| CN104213958A true CN104213958A (en) | 2014-12-17 |
Family
ID=51899554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410227708.0A Pending CN104213958A (en) | 2013-05-31 | 2014-05-27 | 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) |
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| CN107035476A (en) * | 2016-02-03 | 2017-08-11 | 通用汽车环球科技运作有限责任公司 | Generation and conveying of the ammonia in waste gas system |
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| CN108779695A (en) * | 2016-03-09 | 2018-11-09 | 法国大陆汽车公司 | The method of reducing agent consumption in exhaust line for optimizing motor vehicles |
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| CN108779695B (en) * | 2016-03-09 | 2021-08-17 | 法国大陆汽车公司 | Method for optimizing the consumption of a reducing agent in an exhaust line of a motor vehicle |
| CN107191253A (en) * | 2016-03-15 | 2017-09-22 | 现代自动车株式会社 | Method for preventing exhaust heat recovery from failing |
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| 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 |
| CN110325719A (en) * | 2017-02-27 | 2019-10-11 | 图里诺研究合作有限公司 | The electric physical unit of nitrogen conversion is carried out for activating the nitric oxide for including in engine exhaust gas |
| CN110344917A (en) * | 2018-04-05 | 2019-10-18 | 罗伯特·博世有限公司 | Method for running exhausted gas post-processing system |
| CN110344917B (en) * | 2018-04-05 | 2023-02-17 | 罗伯特·博世有限公司 | Method for operating an exhaust gas 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 |
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| 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 |
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| DE102014107006A1 (en) | 2014-12-04 |
| US20140352279A1 (en) | 2014-12-04 |
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Application publication date: 20141217 |