CN104727905A - Method of controlling ammonia amount adsorbed in selective catalytic reduction catalyst and exhaust system using the same - Google Patents
Method of controlling ammonia amount adsorbed in selective catalytic reduction catalyst and exhaust system using the same Download PDFInfo
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- CN104727905A CN104727905A CN201410432844.3A CN201410432844A CN104727905A CN 104727905 A CN104727905 A CN 104727905A CN 201410432844 A CN201410432844 A CN 201410432844A CN 104727905 A CN104727905 A CN 104727905A
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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
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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]
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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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
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1614—NOx amount trapped in catalyst
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention provides a method of controlling the ammonia amount adsorbed in a selective catalytic reduction catalyst and an exhaust system using the same. The method of controlling ammonia amount adsorbed in a selective catalytic reduction (SCR) catalyst, may include detecting current temperature of the SCR catalyst, reading predicted maximum temperature of the SCR catalyst after a predetermined time based on the current temperature of the SCR catalyst, determining a target adsorption amount of ammonia (NH3) based on the predicted maximum temperature of the SCR catalyst, and controlling amount of urea or the NH3 injected into exhaust gas based on the target adsorption amount of the NH3 and current adsorption amount of the NH3.
Description
The cross reference of related application
This application claims the preference of No. 10-2013-0161441st, korean patent application and rights and interests submitted on December 23rd, 2013, the full content of this application is incorporated into this all objects for being quoted by this.
Technical field
The present invention relates to a kind of method controlling the ammonia amount absorbed in selective catalytic reduction catalysts and the vent systems using the method.More specifically, the present invention relates to one control the method for the ammonia amount absorbed in selective catalytic reduction (SCR) catalyzer and use the vent systems of the method, it improves the performance of SCR catalyst by the more ammonia (NH3) be absorbed in SCR catalyst, prevents NH3 from escaping from SCR catalyst simultaneously.
Background technique
Generally speaking, to be advanced to by the waste gas that gas exhaust manifold flows out from motor in the catalytic converter being arranged on outlet pipe and to be cleaned in catalytic converter.Afterwards, when the noise through baffler waste gas is lowered and waste gas then by tailpipe in air.Catalytic converter cleans comprises pollutant in the offgas.In addition, the particulate filter for catching the particulate matter (PM) comprised in the offgas is arranged in outlet pipe.
Selective catalytic reduction (SCR) catalyzer is a type of this catalytic converter.
Such as the reducing agent of urea, ammonia, carbon monoxide and hydrocarbon (HC) in SCR catalyst with oxygen reacting phase than reacting better with nitrogen oxide.
The vent systems being provided with the vehicle of SCR catalyst comprises urea box and dosing module.The reducing agent of such as urea is injected in waste gas through outlet pipe by dosing module, thus SCR catalyst purifying nitrogen oxide effectively.
The reducing agent injected from dosing module is absorbed in SCR catalyst, if the waste gas comprising nitrogen oxide is through SCR reducing agent, reducing agent is released, and and reaction of nitrogen oxides.
But, in SCR catalyst the amount of absorbed reducing agent and the temperature of SCR catalyst closely related.Therefore, can the amount of reducing agent of maximum flow of absorbed reducing agent be absorbed in SCR catalyst if to exceed under the Current Temperatures of SCR catalyst, then a part for reducing agent be escaped from SCR catalyst.
Ammonia is often used as the reducing agent of SCR catalyst.If ammonia is escaped from SCR catalyst, then the ammonia of escaping can stink and client may complain.Therefore, it is very important for preventing reducing agent from escaping from SCR catalyst.
According to the conventional method of the NH3 amount controlling to absorb in SCR catalyst, SCR catalyst is controlled so as to absorb the NH3 amount by the maximum NH3 amount under the Current Temperatures of SCR catalyst being obtained divided by sizable safety facfor.That is, SCR catalyst is controlled to the NH3 amount absorbing and be less than maximum NH3 and measure, and escapes from SCR catalyst to prevent NH3.Therefore, SCR catalyst may be performed poor.
In addition, because SCR catalyst is performed poor, therefore, the volume of SCR catalyst should be increased.
Information disclosed in background of invention part only for strengthening the understanding to general background of the present invention, and should not be regarded as admitting or imply by any way that this information forms prior art known to persons of ordinary skill in the art.
Summary of the invention
All aspects of of the present invention are devoted to provide a kind of and are controlled the method for the ammonia amount absorbed in selective catalytic reduction catalysts and use the vent systems of the method, it has by absorbing more NH3 in SCR catalyst the performance the volume reducing SCR catalyst that improve SCR catalyst, prevents the advantage that NH3 escapes from SCR catalyst simultaneously.
In one aspect of the invention, the method controlling the ammonia amount absorbed in selective catalytic reduction (SCR) catalyzer can comprise: the Current Temperatures detecting SCR catalyst, read the maximum temperature based on the SCR catalyst after predetermined a period of time of the prediction of the Current Temperatures of SCR catalyst, based on the target absorption amount of the maximum temperature determination ammonia (NH3) of the prediction of SCR catalyst, and control based on the target absorption amount of NH3 and the current uptake of NH3 the amount being injected into urea or NH3 in waste gas.
The target absorption amount of NH3 is the maximum NH3 amount absorbed in the maximum temperature place SCR catalyst of the prediction of SCR catalyst.
The target absorption amount of NH3 is for measuring by predetermined safety facfor being multiplied by the maximum NH3 absorbed in the maximum temperature place SCR catalyst of the prediction of SCR catalyst the value obtained.
When the Current Temperatures of SCR catalyst is greater than or equal to Urea Transformation temperature, perform the reading of the maximum temperature of the SCR catalyst after predetermined a period of time of prediction.
Be stored in predetermined mapping according to the SCR catalyst maximum temperature after predetermined a period of time that the Current Temperatures of SCR catalyst is predicted.
Predetermined mapping is stored in the nonvolatile memory of vehicle.
The method can comprise the actual maximum temperature predetermined a period of time detecting SCR catalyst further, determine that the actual maximum temperature of the SCR catalyst of predetermined a period of time is whether higher than the maximum temperature of the SCR catalyst after predetermined a period of time of prediction, and when the maximum temperature of the SCR catalyst after predetermined a period of time higher than prediction of the actual maximum temperature of the SCR catalyst of predetermined a period of time, the maximum temperature of the actual maximum temperature of the SCR catalyst of predetermined a period of time as the SCR catalyst after predetermined a period of time of prediction is stored in predetermined mapping.
In another aspect of this invention, vent systems can comprise motor, reducing agent supply, selective catalytic reduction (SCR) catalyzer, temperature transducer and controller, and motor is produced driving torque by the mixture of combustion air and fuel and will be produced waste gas in combustion and discharged by outlet pipe; Reducing agent supply to be arranged in the downstream of motor on outlet pipe and to be suitable for urea or ammonia (NH3) to be injected in waste gas, and wherein urea is decomposed ammonification; Selective catalytic reduction (SCR) catalyzer to be arranged in the downstream of reducing agent supply on outlet pipe and be suitable for absorbing ammonia and utilize absorb, inject or the ammonia that decomposes reduce and be included in nitrogen oxides of exhaust gas; Temperature transducer detects the temperature of SCR catalyst; And controller reads the maximum temperature based on the SCR catalyst after predetermined a period of time of the prediction of the Current Temperatures of SCR catalyst, based on the target absorption amount of the maximum temperature determination ammonia of the prediction of SCR catalyst, and control the amount of urea or the NH3 injected from reducing agent supply based on the target absorption amount of NH3 and the current uptake of NH3.
The target absorption amount of NH3 is the maximum NH3 amount absorbed in the maximum temperature place SCR catalyst of the prediction of SCR catalyst.
The target absorption amount of NH3 is for measuring by predetermined safety facfor being multiplied by the maximum NH3 absorbed in the maximum temperature place SCR catalyst of the prediction of SCR catalyst the value obtained.
Only when the Current Temperatures of SCR catalyst is greater than or equal to Urea Transformation temperature, controller reads the maximum temperature of the SCR catalyst after predetermined a period of time of prediction.
Maximum temperature according to the SCR catalyst after predetermined a period of time of the prediction of the Current Temperatures of SCR catalyst is stored in predetermined mapping.
Predetermined mapping is stored in the nonvolatile memory of vehicle.
When the maximum temperature of the SCR catalyst after predetermined a period of time higher than prediction of the actual maximum temperature of the SCR catalyst of predetermined a period of time, the maximum temperature of the actual maximum temperature of the SCR catalyst of predetermined a period of time as the SCR catalyst after predetermined a period of time of prediction is stored in predetermined mapping by controller.
Method and apparatus of the present invention has further feature and advantage, these further features and advantage are by apparent from being incorporated in this accompanying drawing and following embodiment, or state in detail in the drawings and specific embodiments, the drawings and specific embodiments are jointly for explaining some principle of the present invention.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the vent systems according to exemplary of the present invention.
Fig. 2 is the block diagram of the vent systems controlling the method for the ammonia amount absorbed in selective catalytic reduction catalysts according to the execution of exemplary of the present invention.
Fig. 3 is the flow chart of the method for the ammonia amount absorbed in selective catalytic reduction catalysts according to the control of exemplary of the present invention.
Fig. 4 is the temperature that the shows selective catalytic reduction catalysts plotted curve for an example of time.
Fig. 5 shows an example of predetermined mapping.
Fig. 6 is the plotted curve of the target absorption amount showing the target absorption amount according to the ammonia of conventional method and the ammonia according to this exemplary.
Should be appreciated that accompanying drawing is not necessarily pro rata, it presents the reduced representation to a certain degree of each feature that basic principle of the present invention is described.Specific design feature of the present invention disclosed herein comprises such as concrete size, direction, position and profile and will partly be determined by the environment specifically will applied and use.
In these figures, run through several figures of accompanying drawing, reference character quotes equally or equivalent part of the present invention.
Embodiment
Now with detailed reference to each embodiment of the present invention, its example is shown in the drawings and describe hereinafter.Although the present invention will describe in conjunction with exemplary, it will be appreciated that, this specification is not intended to the present invention to be limited to those exemplary.On the contrary, the invention is intended to not only cover exemplary, and cover can be included in as claims various replacement schemes in the spirit and scope of the present invention that define, amendment, equivalent and other embodiment.
Hereafter describe exemplary of the present invention with reference to the accompanying drawings in detail.
Fig. 1 is the schematic diagram of the vent systems according to exemplary of the present invention.
As shown in Figure 1, the nitrogen oxide when the waste gas produced in motor 10 is through selective catalytic reduction (SCR) catalyzer 30 in waste gas is eliminated.If needed, the particulate filter for catching the particulate matter comprised in the offgas and/or the oxidation catalyst for making to comprise carbon monoxide in the offgas or oxidizing hydrocarbon can be used.Waste gas system display as shown in Figure 1 can apply the simplified topology of the vent systems of spirit of the present invention, and understanding scope of the present invention is not limited to the vent systems shown in Fig. 1.
Motor 10 burns and is wherein mixed with the air/fuel mixture of fuel and air, so that chemical energy is converted into mechanical energy.Motor 10 be connected to intake manifold 16 with by air receiver in firing chamber 12, and be connected to gas exhaust manifold 18, make to be expelled to outside in the gas sampling produced in combustion to gas exhaust manifold 18.Sparger 14 is arranged in firing chamber 12 so that fuel is injected firing chamber 12.
Outlet pipe 20 is connected to gas exhaust manifold 18 and is suitable for waste gas to be expelled to the outside of vehicle.
SCR catalyst 30 to be arranged on outlet pipe 20 and to be suitable for using reducing agent that the reduction of nitrogen oxide comprised in the offgas is become nitrogen.
In order to these objects, releasing system comprises urea box, urea pump and dosing module 34 further.In order to brief description, in the accompanying drawings urea box and urea pump are not shown.In addition, urea is injected by dosing module 34 in this specification, but is not limited to dosing module 34 and only injects urea.That is, dosing module 34 can inject ammonia.And different from ammonia, reducing agent can inject or inject individually together with ammonia.
Urea by urea pump pumping is injected in outlet pipe 20 by dosing module 34.Dosing module 34 to be arranged on outlet pipe 20 and to be injected in waste gas by urea before entering SCR catalyst 30 between motor 10 and SCR catalyst 30.The urea be injected in waste gas is broken down into ammonia and the ammonia decomposed is used as the reducing agent of nitrogen oxide.
Meanwhile, the urea box described in this manual, urea pump and dosing module are the example of reducing agent supply, and will understand, and scope of the present invention is not limited to the example of reducing agent supply.That is, the reducing agent supply of other types can be used in an exemplary embodiment of the present invention.
Vent systems comprises multiple sensor further, and multiple sensor comprises the first NOx sensor 32, temperature transducer 36 and the second NOx sensor 38.
First NOx sensor 32 to be arranged in the upstream of SCR catalyst 30 on outlet pipe 20 and to detect the NOx amount be included in the waste gas of the upstream end of SCR catalyst.
Temperature transducer 36 is arranged on outlet pipe 20 or in SCR catalyst 30 in the upstream of SCR catalyst 30, and detects the temperature of the waste gas in the upstream end or SCR catalyst 30 of SCR catalyst 30.In order to better understand and be convenient to describe, the temperature of the SCR catalyst 30 described in the present specification and claims can be the temperature of the temperature of the waste gas of the upstream end of SCR catalyst 30 or the waste gas in SCR catalyst 30.
Second NOx sensor 38 to be arranged in the downstream of SCR catalyst 30 on outlet pipe 20 and to detect the NOx amount be included in the waste gas of the downstream part of SCR catalyst 30.In multiple exemplary, replace use second NOx sensor 38, can predict based on the amount of the operation history of waste gas flow velocity, motor, the temperature of SCR catalyst 30, the injection amount of reducing agent and/or the reducing agent absorbed in SCR catalyst 30 in the NOx amount of the upstream end of SCR catalyst 30.
Vent systems comprises controller 40 further.Controller 40 is based on the first NOx sensor 32 and the detection control sparger 14 of the second NOx sensor 38 and temperature transducer 36 and the operation of dosing module 36.
Fig. 2 is the block diagram of the vent systems controlling the method for the ammonia amount absorbed in selective catalytic reduction catalysts according to the execution of exemplary of the present invention.
Temperature transducer 36 detects the temperature of SCR catalyst 30 and will correspond to the Signal transmissions of the temperature of SCR catalyst 30 to controller 40.
First NOx sensor 32 detects the NOx amount that is included in the waste gas of the upstream end of SCR catalyst 30 and will correspond to the Signal transmissions of this NOx amount to controller 40.
Second NOx sensor 38 detects the NOx amount that is included in the waste gas of the downstream part of SCR catalyst 30 and will correspond to the Signal transmissions of this NOx amount to controller 40.
Controller 40 based on the temperature computation of the SCR catalyst 30 detected by temperature transducer 36 in SCR catalyst 30 by the target absorption amount of absorbed NH3, and based on the urea amount that the target absorption amount and being controlled by the NOx amount be included in the waste gas of the upstream end of SCR catalyst 30 that the first NOx sensor 32 detects of NH3 is injected by dosing module 34.
In addition, controller 40 can assess the performance of SCR catalyst 30 based on the NOx be included in the waste gas of the downstream part of SCR catalyst 30 detected by the second NOx sensor 38.
And controller 40 can control the fuel quantity that injected by sparger 14 and injection timing based on the driving condition of vehicle.
Controller 40 is by being realized by one or more processors of predetermined program activation, and predetermined program can be programmed to each step of the method performing the ammonia amount absorbed in selective catalytic reduction catalysts according to the control of exemplary of the present invention.
Meanwhile, controller 40 can comprise storage 42.Illustrate in this manual, but be not limited to storage 42 and be arranged in controller 40.Storage 42 can be nonvolatile memory.
Fig. 3 is the flow chart of the method for the ammonia amount absorbed in selective catalytic reduction catalysts according to the control of exemplary of the present invention, Fig. 4 is the temperature that the shows selective catalytic reduction catalysts plotted curve for an example of time, and Fig. 5 shows an example of predetermined mapping.
As shown in Figure 3, when opening ignition key in step S100 place, the method for the ammonia amount absorbed in selective catalytic reduction catalysts according to the control of exemplary of the present invention is started.
If open ignition key in step S100, then detect the Current Temperatures of SCR catalyst 30 in step S110 place temperature transducer 36 and will the Signal transmissions of this Current Temperatures be corresponded to controller 40.
If controller 40 receives the signal of the Current Temperatures corresponding to SCR catalyst 30, then determine that whether the Current Temperatures of SCR catalyst 30 is greater than or equal to Urea Transformation temperature in step S120 controller 40.At this, Urea Transformation temperature be by dosing module 34 inject urea can be decomposed ammonification and decompose ammonia can in the absorbed temperature of SCR catalyst 30.If inject urea at the temperature lower than Urea Transformation temperature, then urea can not be decomposed ammonification, can not be absorbed if be decomposed in SCR catalyst 30 and escape from SCR catalyst 30.Therefore, can normal running at the temperature greater than or equal to Urea Transformation temperature according to the method for embodiment of the present invention.
If in the Current Temperatures of step S120 place SCR catalyst 30 lower than Urea Transformation temperature, then method is back to step S100.If in the Current Temperatures of step S120 place SCR catalyst 30 greater than or equal to Urea Transformation temperature, then read SCR catalyst 30 maximum temperature after predetermined a period of time t of the prediction of the Current Temperatures based on SCR catalyst 30 in step S130 place controller 40.As shown in Figure 5, the maximum temperature of the SCR catalyst 30 after predetermined a period of time t predicted according to the Current Temperatures of SCR catalyst 30 is stored in predetermined mapping, and predetermined mapping can be stored in storage 42.Because storage 42 is nonvolatile memories, therefore predetermined mapping is not wiped from storage 42.
Although the temperature of SCR catalyst 30 constantly changes, the temperature of SCR catalyst 30 can change in particular range.That is, the temperature of SCR catalyst 30 can be equal to or less than the maximum temperature of the SCR catalyst 30 after predetermined a period of time t of prediction.In addition, if the temperature change of SCR catalyst 30 becomes the temperature of the maximum temperature of the SCR catalyst 30 at predetermined a period of time t higher than prediction, maximum temperature is stored in predetermined mapping by the maximum temperature of the prediction as SCR catalyst 30.
If read the maximum temperature according to the SCR catalyst 30 after predetermined a period of time t of the prediction of the Current Temperatures of SCR catalyst 30 in step S130 place, in the target absorption amount of step S140 place controller 40 based on the maximum temperature calculating NH3 of prediction.As mentioned above, the highest maximum temperature becoming the SCR catalyst 30 after predetermined a period of time t of prediction of temperature due to SCR catalyst 30, therefore, if calculate target absorption amount based on the maximum temperature of prediction, then NH3 can not escape from SCR catalyst 30.In multiple exemplary, the target absorption amount of NH3 can be that at the maximum temperature place of the prediction of SCR catalyst 30, absorbable maximum NH3 measures SCR catalyst 30.In multiple exemplary, the target absorption amount of NH3 may be that at the maximum temperature place of the prediction of SCR catalyst 30, absorbable maximum NH3 measures the value obtained by predetermined safety facfor being multiplied by SCR catalyst 30.In this case, safety facfor can be the value (such as, 1.1 or 1.2) close to 1.
If calculate the target absorption amount of NH3 in step S140, to be then injected into the urea amount in waste gas by dosing module 34 based on the target absorption amount of NH3 and the current NH3 amount control that absorbs in SCR catalyst 30 in step S150 place controller 40.Additionally, can consider to comprise NOx amount in the offgas at the upstream end of SCR catalyst 30.
After this, detect the predetermined a period of time t of actual maximum temperature of SCR catalyst 30 in step S160 place temperature transducer 36, and will the Signal transmissions of this actual maximum temperature be corresponded to controller 40.Perform step S160 to upgrade predetermined mapping, and describe this process in detail with reference to Fig. 4 and Fig. 5.
If detect the predetermined a period of time t of actual maximum temperature of SCR catalyst 30 in step S160, then determine in step S170 place controller 40 that the actual maximum temperature of the SCR catalyst 30 of predetermined a period of time t is whether higher than the maximum temperature of the SCR catalyst 30 after predetermined a period of time t predicted.
If in the actual maximum temperature of the SCR catalyst 30 of step S170 place t of predetermined a period of time less than or equal to the maximum temperature of the SCR catalyst 30 after predetermined a period of time t of prediction, then the method is back to step S100.If when the actual maximum temperature of the SCR catalyst 30 of predetermined a period of time t is higher than the maximum temperature of the SCR catalyst 30 after predetermined a period of time t of prediction, then upgrade predetermined mapping in step S180 controller 40.The renewal of predetermined mapping will be described in detail.
As shown in Figure 4, the temperature of SCR catalyst 30 is along with constantly changing time lapse.If the Current Temperatures of SCR catalyst 30 is Tc, then first the maximum temperature of the SCR catalyst 30 after predetermined time t predicted is set as T1 (please refer to the curve below in Fig. 5).After this, when the Current Temperatures of SCR catalyst 30 is Tc, for predetermined a period of time t, the temperature of SCR catalyst 30 is increased to T2.In this case, the maximum temperature of the prediction of SCR catalyst 30 is reset as T2 (please refer to the upper curve in Fig. 5).If when the Current Temperatures of SCR catalyst 30 is Tc, for predetermined a period of time t, the temperature of SCR catalyst 30 is not increased to T1, then the maximum temperature of the prediction of SCR catalyst 30 remains T1.Predetermined mapping is constantly updated by this way.
Fig. 6 is the plotted curve of the target absorption amount showing the target absorption amount according to the ammonia of conventional method and the ammonia according to this exemplary.In figure 6, solid line represents the target absorption amount of the NH3 according to exemplary of the present invention, and dotted line represents the target absorption amount of the NH3 according to conventional method.
As shown in Figure 6, according to conventional method, be m1 in the target absorption amount of the NH3 at the Current Temperatures Tc place of SCR catalyst 30, but according to exemplary of the present invention, the target absorption amount of the NH3 at the Current Temperatures Tc place of SCR catalyst 30 is m2.In addition, represent that the solid line of the target absorption amount of the NH3 according to exemplary of the present invention is located according to the dotted line of the target absorption amount of the NH3 of conventional method higher than expression.That is, compared with traditional method, at the identical temperature place of SCR catalyst 30, according to the more NH3 of SCR catalyst 30 Absorbable rod of exemplary of the present invention.Therefore, the over-all properties of SCR catalyst 30 can be utilized and the volume of SCR catalyst 30 can be reduced.
As mentioned above, exemplary of the present invention improves the performance of selective catalytic reduction catalysts by absorbing more NH3 in selective catalytic reduction catalysts and reduces the volume of selective catalytic reduction catalysts, prevents ammonia from escaping from selective catalytic reduction catalysts simultaneously.
Conveniently explain and accurately limit claims, term " on ", D score, " interior " and " outward " be used to the position of these features shown by reference accompanying drawing to describe the feature of illustrative embodiments.
The foregoing description of particular exemplary embodiment of the present invention provides to illustrate and describe.They are not intended to exhaustive or the present invention are limited to described precise forms, and in view of above instruction, many modifications and variations are obviously possible.They are not intended to exhaustive or the present invention are limited to described precise forms, and in view of above instruction, many modifications and variations and various replacement scheme are obviously possible with amendment.Scope of the present invention is intended to be limited by claims and equivalents thereof thereof.
Claims (14)
1. control a method for the ammonia amount absorbed in selective catalytic reduction SCR catalyst, comprising:
Detect the Current Temperatures of SCR catalyst;
Read the maximum temperature based on the described SCR catalyst after predetermined a period of time of the prediction of the Current Temperatures of described SCR catalyst;
Based on the target absorption amount of the maximum temperature determination ammonia NH3 of the prediction of described SCR catalyst; And
The amount of urea or the NH3 be injected in waste gas is controlled based on the target absorption amount of NH3 and the current uptake of NH3.
2. the method controlling the ammonia amount absorbed in selective catalytic reduction SCR catalyst according to claim 1, the maximum NH3 amount of target absorption amount for absorbing in SCR catalyst described in the maximum temperature place of the prediction in described SCR catalyst of wherein said NH3.
3. the method controlling the ammonia amount absorbed in selective catalytic reduction SCR catalyst according to claim 1, the target absorption amount of wherein said NH3 is for measuring by predetermined safety facfor being multiplied by the maximum NH3 absorbed in SCR catalyst described in the maximum temperature place of the prediction of SCR catalyst the value obtained.
4. the method controlling the ammonia amount absorbed in selective catalytic reduction SCR catalyst according to claim 1, wherein when the Current Temperatures of described SCR catalyst is greater than or equal to Urea Transformation temperature, perform the reading of the maximum temperature of the SCR catalyst after predetermined a period of time of prediction.
5. the method controlling the ammonia amount absorbed in selective catalytic reduction SCR catalyst according to claim 1, the maximum temperature of the SCR catalyst after predetermined a period of time wherein predicted according to the Current Temperatures of described SCR catalyst is stored in predetermined mapping.
6. the method controlling the ammonia amount absorbed in selective catalytic reduction SCR catalyst according to claim 5, wherein said predetermined mapping is stored in the nonvolatile memory of vehicle.
7. the method controlling the ammonia amount absorbed in selective catalytic reduction SCR catalyst according to claim 5, comprises further:
Detect actual maximum temperature predetermined a period of time of described SCR catalyst;
Determine that the actual maximum temperature of the SCR catalyst of predetermined a period of time is whether higher than the maximum temperature of the SCR catalyst after predetermined a period of time of prediction; And
When the maximum temperature of the SCR catalyst after predetermined a period of time higher than prediction of the actual maximum temperature of the SCR catalyst of described predetermined a period of time, the maximum temperature of the actual maximum temperature of the SCR catalyst of described predetermined a period of time as the SCR catalyst after predetermined a period of time of prediction is stored in described predetermined mapping.
8. a vent systems, comprising:
Motor, described motor is produced driving torque by the mixture of combustion air and fuel and is discharged by outlet pipe by the waste gas produced in combustion;
Reducing agent supply, described reducing agent supply to be arranged in the downstream of described motor on described outlet pipe and to be suitable for urea or ammonia NH3 to be injected in described waste gas, and wherein said urea is decomposed ammonification;
Selective catalytic reduction SCR catalyst, described selective catalytic reduction SCR catalyst to be arranged in the downstream of described reducing agent supply on described outlet pipe and be suitable for absorbing ammonia and utilize absorb, inject or the ammonia that decomposes reduce and be included in nitrogen oxides of exhaust gas;
Temperature transducer, described temperature transducer detects the temperature of SCR catalyst; And
Controller, described reading is based on the maximum temperature of the SCR catalyst after predetermined a period of time of the prediction of the Current Temperatures of described SCR catalyst, based on the target absorption amount of the maximum temperature determination ammonia of the prediction of described SCR catalyst, and control the amount of urea or the NH3 injected from described reducing agent supply based on the target absorption amount of NH3 and the current uptake of NH3.
9. vent systems according to claim 8, the maximum NH3 amount of target absorption amount for absorbing in SCR catalyst described in the maximum temperature place of the prediction in described SCR catalyst of wherein said NH3.
10. vent systems according to claim 8, the target absorption amount of wherein said NH3 is for measuring by predetermined safety facfor being multiplied by the maximum NH3 absorbed in SCR catalyst described in the maximum temperature place of the prediction of described SCR catalyst the value obtained.
11. vent systems according to claim 8, wherein only when the Current Temperatures of described SCR catalyst is greater than or equal to Urea Transformation temperature, described controller reads the maximum temperature of the SCR catalyst after predetermined a period of time of prediction.
12. vent systems according to claim 8, are wherein stored in predetermined mapping according to the maximum temperature of the SCR catalyst after predetermined a period of time of the prediction of the Current Temperatures of described SCR catalyst.
13. vent systems according to claim 12, wherein said predetermined mapping is stored in the nonvolatile memory of vehicle.
14. vent systems according to claim 12, wherein when the maximum temperature of the SCR catalyst after predetermined a period of time higher than prediction of the actual maximum temperature of the SCR catalyst of described predetermined a period of time, the maximum temperature of the actual maximum temperature of the SCR catalyst of described predetermined a period of time as the SCR catalyst after predetermined a period of time of prediction is stored in predetermined mapping by described controller.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2013-0161441 | 2013-12-23 | ||
| KR1020130161441A KR101534714B1 (en) | 2013-12-23 | 2013-12-23 | Method of controlling ammonia amount absorbed in selective catalytic reduction catalyst and exhaust system using the same |
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| CN104727905A true CN104727905A (en) | 2015-06-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201410432844.3A Pending CN104727905A (en) | 2013-12-23 | 2014-08-28 | Method of controlling ammonia amount adsorbed in selective catalytic reduction catalyst and exhaust system using the same |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20150176459A1 (en) |
| KR (1) | KR101534714B1 (en) |
| CN (1) | CN104727905A (en) |
| DE (1) | DE102014109184B4 (en) |
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| CN111502809A (en) * | 2019-01-31 | 2020-08-07 | 现代自动车株式会社 | Aftertreatment system and aftertreatment method for lean burn engine |
| CN113811486A (en) * | 2019-05-14 | 2021-12-17 | 大宇造船海洋株式会社 | Fuel supply system of environment-friendly ship |
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|---|---|---|---|---|
| US9494070B2 (en) * | 2014-09-17 | 2016-11-15 | Hyundai Motor Company | Method of controlling ammonia amount absorbed in selective catalytic reduction catalyst and exhaust system using the same |
| US10502113B2 (en) * | 2017-07-10 | 2019-12-10 | GM Global Technology Operations LLC | Selective catalytic reduction ammonia storage control |
| DE102019216520A1 (en) | 2019-10-28 | 2021-04-29 | Robert Bosch Gmbh | Method for adapting the dosage of reducing agent in an SCR catalytic converter |
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Also Published As
| Publication number | Publication date |
|---|---|
| DE102014109184B4 (en) | 2022-05-05 |
| US20150176459A1 (en) | 2015-06-25 |
| DE102014109184A1 (en) | 2015-06-25 |
| KR20150073578A (en) | 2015-07-01 |
| KR101534714B1 (en) | 2015-07-07 |
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