US20120131905A1 - Exhaust gas post processing method - Google Patents
Exhaust gas post processing method Download PDFInfo
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- US20120131905A1 US20120131905A1 US13/168,217 US201113168217A US2012131905A1 US 20120131905 A1 US20120131905 A1 US 20120131905A1 US 201113168217 A US201113168217 A US 201113168217A US 2012131905 A1 US2012131905 A1 US 2012131905A1
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- exhaust gas
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- temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
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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
- F01N3/103—Oxidation catalysts for HC and CO only
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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
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0215—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission
- F02D41/0225—Introducing corrections for particular conditions exterior to the engine in relation with elements of the transmission in relation with the gear ratio or shift lever position
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
- F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
- F02D41/1447—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures with determination means using an estimation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
- F02D41/405—Multiple injections with post injections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/021—Engine temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0414—Air temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
- F02D2200/501—Vehicle speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/70—Input parameters for engine control said parameters being related to the vehicle exterior
- F02D2200/703—Atmospheric 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
Definitions
- the present invention relates to an exhaust gas post processing method that utilizes a rapid-heat-up (RHU) logic process to quickly raise a temperature of exhaust gas so as to activate catalyst that reduces harmful material included in the exhaust gas.
- RHU rapid-heat-up
- a diesel oxidation catalyst (DOC), a diesel particulate filter (DPF), and a selective catalytic reduction (SCR) unit are sequentially disposed along an exhaust passageway in a predetermined order in a conventional exhaust purification device.
- DOC diesel oxidation catalyst
- DPF diesel particulate filter
- SCR selective catalytic reduction
- the exhaust gas of the engine passes the diesel oxidation catalyst, the diesel particulate filter, and the SCR unit sequentially and harmful materials therein is eliminated.
- the diesel particulate filter traps particulate matters (PM) included in the exhaust gas
- the diesel oxidation catalyst oxidizes carbon monoxide and hydrocarbon included in the exhaust gas to carbon dioxide
- the SCR unit reduces nitrogen oxide included in the exhaust gas to nitrogen gas.
- the exhaust gas temperature of an upstream side of the SCR unit is to be higher than 200° C. so as to make the nitrogen oxide actively react with the reducing agent.
- the SCR unit is disposed at a rear end portion of the exhaust passageway, a comparably long time is necessary until the exhaust gas temperature of a front side of the SCR unit reaches a temperature higher than 200° C.
- the nitrogen oxide included in the exhaust gas is hardly reduced to be exhausted outside until the exhaust gas temperature of a front side of the SCR unit reaches 200° C.
- a rapid-heat-up (RHU) logic process for quickly raising the exhaust gas temperature has been gradually applied so as to quickly heat the catalyst, and it is necessary to determine a driving condition for performing the rapid-heat-up logic process and to detect an error thereof.
- the present invention has been made in an effort to provide an exhaust gas post processing method having the advantages of performing a rapid-heat-up logic process for quickly raising a temperature of exhaust gas and having on board diagnosis function determining whether the rapid-heat-up logic process is performed normally.
- An exhaust gas post processing method may include determining whether a driving condition requires monitoring a rapid-heat-up (RHU) logic process that is used to quickly raise a temperature of exhaust gas passing an exhaust line, detecting on/off signal that performs or stops the rapid-heat-up logic, determining whether an injection signal for performing the rapid-heat-up logic process is activated or not, detecting error of components for performing the rapid-heat-up logic process, and detecting the temperature of the exhaust during the rapid-heat-up logic process and comparing the detected temperature with a modeled value.
- RHU rapid-heat-up
- the exhaust gas post processing method may include outputting an error signal in a case that the detected temperature that is raised by the rapid-heat-up logic process gets out of the modeled value.
- the exhaust gas post processing method may include accumulating the error signal, and storing the accumulated value and activating a rapid-heat-up logic warning lamp, for example, a malfunction indicator lamp (MIL), if the accumulated value exceeds a predetermined value.
- a rapid-heat-up logic warning lamp for example, a malfunction indicator lamp (MIL)
- the driving condition for performing the rapid-heat-up logic process that requires entering into the rapid-heat-up logic process, and the condition for entering into the rapid-heat-up logic process is determined based on an atmospheric pressure, a vehicle speed, an engine speed, an intake air temperature, a coolant temperature, a gear speed, and a fuel injection amount.
- a post injection amount for performing the rapid-heat-up logic process is determined based on the engine speed and the fuel injection amount to inject the fuel.
- the component includes an injector injecting the fuel and a temperature sensor detecting the temperature of the exhaust gas in a step of the detecting the error of the component.
- a diesel oxidation catalyst that oxidizes harmful materials included in the exhaust gas, a diesel particulate filter that filters particulate matters included in the exhaust gas, a dosing module that injects reducing agent into the exhaust gas passing the exhaust line, and a selective catalyst reduction unit (SCR) that uses the reducing agent injected by the dosing module to reduce/oxidize nitrogen oxide included in the exhaust gas are sequentially disposed on the exhaust line.
- Temperature sensor detects temperatures of a rear side of the engine, a front side of the diesel oxidation catalyst, a front side of the diesel particulate filter, and a front side of the selective catalyst reduction unit.
- FIG. 1 is a schematic diagram of an exemplary exhaust gas post processing system according to the present invention.
- FIG. 2 is a schematic flowchart of an exemplary exhaust gas post processing method according to the present invention.
- FIG. 3 is a detailed flowchart showing an exemplary exhaust gas post processing method according to the present invention.
- FIG. 4 is a graph showing a temperature of exhaust gas and a diagnosis function thereof in a condition that an exemplary rapid-heat-up logic process is performed according to the present invention.
- FIG. 1 is a schematic diagram of an exhaust gas post processing system according to various embodiments of the present invention.
- an exhaust gas post processing system includes an engine 100 , an injector 110 , a control unit 120 , an exhaust line 130 , a diesel oxidation catalyst 140 , a diesel particulate filter 150 , a dosing module 160 , a mixer 170 , a selective catalyst reduction unit 180 , and a temperature sensor, which may include one or more sensors, for example, T 3 , T 4 , T 5 , T 6 , and/or T 7 .
- the injector 110 is provided on the engine 100 and the injector 110 injects fuel into a cylinder to perform a post injection for a rapid-heat-up (RHU).
- RHU rapid-heat-up
- the exhaust gas of the engine 100 sequentially passes the diesel oxidation catalyst 140 of the exhaust line 130 , the diesel particulate filter 150 , the mixer 170 , and the selective catalyst reduction unit 180 to be exhausted to the outside through a muffler.
- the temperature sensor T 6 and T 7 detects a temperature of the exhaust gas flowing into the diesel oxidation catalyst 140 , a temperature of the exhaust gas flowing into the diesel particulate filter 150 , and a temperature of the exhaust gas flowing into the selective catalyst reduction unit 180 .
- the control unit 120 uses a driving condition of the engine 100 and the exhaust gas temperature flowing the exhaust line 130 to determine whether a rapid-heat-up logic process is to be performed or not, and if the condition for performing the rapid-heat-up logic is satisfied, a normal injection and a post injection are performed through the injector 110 .
- control unit 120 uses a driving condition of the engine 100 and the exhaust gas temperature flowing the exhaust line 130 to stop the rapid-heat-up logic or not to start the rapid-heat-up logic.
- FIG. 2 is a schematic flowchart of an exhaust gas post processing method according to various embodiments of the present invention
- FIG. 3 is a detailed flowchart showing an exhaust gas post processing method according to various embodiments of the present invention.
- a monitored condition requires a rapid-heat-up function, for example, the RHU logic process.
- the monitoring of the rapid-heat-up function can itself be considered a condition that may warrant the rapid-heat-up function logic process be performed.
- the control unit 120 detects an atmospheric pressure, a vehicle speed, an engine speed, an intake air temperature, a coolant temperature, a gear speed, a fuel injection amount, and an exhaust gas temperature (T 6 or T 7 ), determines whether the rapid-heat-up function is to be performed or not, and monitors the condition that the rapid-heat-up function is being performed.
- the injection signal includes an operating signal that is transferred from the control unit 120 to operate the injector 110 such that a post injection is performed.
- An error of the components for performing the rapid-heat-up logic is detected in a S 230 .
- the injector 110 and the temperature sensor (T 3 to T 7 ) are used so as to perform the rapid-heat-up, if the injector 110 or the temperature sensor (T 3 to T 7 ) malfunctions or breaks down, the control unit 120 generates an error signal of the components for the rapid-heat-up.
- a temperature of the exhaust gas is detected during the rapid-heat-up, the detected temperature is compared to a modeled temperature, and it is determined whether the temperature of the exhaust gas ranges in a predetermined temperature area.
- the monitoring ends to output result thereof.
- the rapid-heat-up function is evaluated by detecting the temperature of the exhaust gas through the temperature sensor.
- a malfunction indicator lamp MIL
- FIG. 4 is a graph showing a temperature of exhaust gas and a diagnosis function thereof in a condition that a rapid-heat-up logic process is performed according to various embodiments of the present invention.
- a horizontal axis indicates time
- a vertical axis indicates a temperature of the exhaust gas flowing into the selective catalyst reduction unit 180 .
- a range of the RUH model temperature 400 is set by a predetermined map data, and a graph of the exhaust gas temperature 410 flowing into the selective catalyst reduction unit 180 is formed during the ON condition of the RHU. Further, a graph of the exhaust gas temperature 420 is formed during the OFF condition of the RUH.
- a modeled temperature 430 of the exhaust gas is formed by a driving condition of the engine and the rapid-heat-up logic, and an error signal 440 is generated, if a temperature 410 exceeds the modeled temperature 430 and the predetermined temperature range 400 .
- the control unit 120 counts the error signal and stores the counted number, and if the counted number exceeds a predetermined or modeled value, activates a warning lamp (MIL).
- MIL warning lamp
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Materials Engineering (AREA)
- Exhaust Gas After Treatment (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Testing Of Engines (AREA)
Abstract
An exhaust gas post processing method may include determining whether a driving condition is included in an area for monitoring a rapid-heat-up (RHU) logic process that is used to quickly raise a temperature of exhaust gas passing an exhaust line, detecting on/off signal that performs or stops the rapid-heat-up logic process, determining whether an injection signal for performing the rapid-heat-up logic process is activated or not, detecting error of components for performing the rapid-heat-up logic process, and detecting the temperature of the exhaust during the rapid-heat-up logic process and comparing the detected temperature with a modeled value.
Accordingly, malfunction of the rapid-heat-up logic process is prevented before hand to realize the rapid-heat-up logic process securely, and the malfunction by the error signal is informed to the driver such that the on board diagnosis function is improved.
Description
- The present application claims priority of Korean Patent Application No. 10-2010-0120936 filed Nov. 30, 2010, the entire contents of which is incorporated herein for all purposes by reference.
- 1. Field of the Invention
- The present invention relates to an exhaust gas post processing method that utilizes a rapid-heat-up (RHU) logic process to quickly raise a temperature of exhaust gas so as to activate catalyst that reduces harmful material included in the exhaust gas.
- 2. Description of the Related Art
- A diesel oxidation catalyst (DOC), a diesel particulate filter (DPF), and a selective catalytic reduction (SCR) unit are sequentially disposed along an exhaust passageway in a predetermined order in a conventional exhaust purification device.
- The exhaust gas of the engine passes the diesel oxidation catalyst, the diesel particulate filter, and the SCR unit sequentially and harmful materials therein is eliminated.
- That is, the diesel particulate filter traps particulate matters (PM) included in the exhaust gas, the diesel oxidation catalyst oxidizes carbon monoxide and hydrocarbon included in the exhaust gas to carbon dioxide, and the SCR unit reduces nitrogen oxide included in the exhaust gas to nitrogen gas.
- Meanwhile, the exhaust gas temperature of an upstream side of the SCR unit is to be higher than 200° C. so as to make the nitrogen oxide actively react with the reducing agent. However, since the SCR unit is disposed at a rear end portion of the exhaust passageway, a comparably long time is necessary until the exhaust gas temperature of a front side of the SCR unit reaches a temperature higher than 200° C.
- Accordingly, the nitrogen oxide included in the exhaust gas is hardly reduced to be exhausted outside until the exhaust gas temperature of a front side of the SCR unit reaches 200° C.
- Meanwhile, a rapid-heat-up (RHU) logic process for quickly raising the exhaust gas temperature has been gradually applied so as to quickly heat the catalyst, and it is necessary to determine a driving condition for performing the rapid-heat-up logic process and to detect an error thereof.
- The information disclosed in this Background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
- The present invention has been made in an effort to provide an exhaust gas post processing method having the advantages of performing a rapid-heat-up logic process for quickly raising a temperature of exhaust gas and having on board diagnosis function determining whether the rapid-heat-up logic process is performed normally.
- An exhaust gas post processing method may include determining whether a driving condition requires monitoring a rapid-heat-up (RHU) logic process that is used to quickly raise a temperature of exhaust gas passing an exhaust line, detecting on/off signal that performs or stops the rapid-heat-up logic, determining whether an injection signal for performing the rapid-heat-up logic process is activated or not, detecting error of components for performing the rapid-heat-up logic process, and detecting the temperature of the exhaust during the rapid-heat-up logic process and comparing the detected temperature with a modeled value.
- The exhaust gas post processing method may include outputting an error signal in a case that the detected temperature that is raised by the rapid-heat-up logic process gets out of the modeled value.
- The exhaust gas post processing method may include accumulating the error signal, and storing the accumulated value and activating a rapid-heat-up logic warning lamp, for example, a malfunction indicator lamp (MIL), if the accumulated value exceeds a predetermined value.
- The driving condition for performing the rapid-heat-up logic process that requires entering into the rapid-heat-up logic process, and the condition for entering into the rapid-heat-up logic process is determined based on an atmospheric pressure, a vehicle speed, an engine speed, an intake air temperature, a coolant temperature, a gear speed, and a fuel injection amount.
- If the condition for entering into the rapid-heat-up logic is satisfied, a post injection amount for performing the rapid-heat-up logic process is determined based on the engine speed and the fuel injection amount to inject the fuel.
- The component includes an injector injecting the fuel and a temperature sensor detecting the temperature of the exhaust gas in a step of the detecting the error of the component.
- A diesel oxidation catalyst that oxidizes harmful materials included in the exhaust gas, a diesel particulate filter that filters particulate matters included in the exhaust gas, a dosing module that injects reducing agent into the exhaust gas passing the exhaust line, and a selective catalyst reduction unit (SCR) that uses the reducing agent injected by the dosing module to reduce/oxidize nitrogen oxide included in the exhaust gas are sequentially disposed on the exhaust line.
- Temperature sensor detects temperatures of a rear side of the engine, a front side of the diesel oxidation catalyst, a front side of the diesel particulate filter, and a front side of the selective catalyst reduction unit.
- In the exhaust gas post processing method according to the present invention as described above, malfunction of the rapid-heat-up logic process is prevented before hand to realize the rapid-heat-up logic securely, and the malfunction by the error signal is informed to the driver such that the on board diagnosis function is improved.
- The methods and apparatuses of the present invention have other features and advantages which will be apparent from or are set forth in more detail in the accompanying drawings, which are incorporated herein, and the following Detailed Description of the Invention, which together serve to explain certain principles of the present invention.
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FIG. 1 is a schematic diagram of an exemplary exhaust gas post processing system according to the present invention. -
FIG. 2 is a schematic flowchart of an exemplary exhaust gas post processing method according to the present invention. -
FIG. 3 is a detailed flowchart showing an exemplary exhaust gas post processing method according to the present invention. -
FIG. 4 is a graph showing a temperature of exhaust gas and a diagnosis function thereof in a condition that an exemplary rapid-heat-up logic process is performed according to the present invention. - Reference will now be made in detail to various embodiments of the present invention(s), examples of which are illustrated in the accompanying drawings and described below. While the invention(s) will be described in conjunction with exemplary embodiments, it will be understood that present description is not intended to limit the invention(s) to those exemplary embodiments. On the contrary, the invention(s) is/are intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims.
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FIG. 1 is a schematic diagram of an exhaust gas post processing system according to various embodiments of the present invention. - Referring to
FIG. 1 , an exhaust gas post processing system includes anengine 100, aninjector 110, acontrol unit 120, anexhaust line 130, adiesel oxidation catalyst 140, adiesel particulate filter 150, adosing module 160, amixer 170, a selectivecatalyst reduction unit 180, and a temperature sensor, which may include one or more sensors, for example, T3, T4, T5, T6, and/or T7. - The
injector 110 is provided on theengine 100 and theinjector 110 injects fuel into a cylinder to perform a post injection for a rapid-heat-up (RHU). - The exhaust gas of the
engine 100 sequentially passes thediesel oxidation catalyst 140 of theexhaust line 130, thediesel particulate filter 150, themixer 170, and the selectivecatalyst reduction unit 180 to be exhausted to the outside through a muffler. - The temperature sensor T6 and T7 detects a temperature of the exhaust gas flowing into the
diesel oxidation catalyst 140, a temperature of the exhaust gas flowing into thediesel particulate filter 150, and a temperature of the exhaust gas flowing into the selectivecatalyst reduction unit 180. - The
control unit 120 uses a driving condition of theengine 100 and the exhaust gas temperature flowing theexhaust line 130 to determine whether a rapid-heat-up logic process is to be performed or not, and if the condition for performing the rapid-heat-up logic is satisfied, a normal injection and a post injection are performed through theinjector 110. - Further, the
control unit 120 uses a driving condition of theengine 100 and the exhaust gas temperature flowing theexhaust line 130 to stop the rapid-heat-up logic or not to start the rapid-heat-up logic. -
FIG. 2 is a schematic flowchart of an exhaust gas post processing method according to various embodiments of the present invention, andFIG. 3 is a detailed flowchart showing an exhaust gas post processing method according to various embodiments of the present invention. - Referring to
FIG. 2 , it is determined in a step S200 whether or not a monitored condition requires a rapid-heat-up function, for example, the RHU logic process. - Here, it is determined whether or not a driving condition warrants the rapid-heat-up logic process.
- Further, the monitoring of the rapid-heat-up function can itself be considered a condition that may warrant the rapid-heat-up function logic process be performed.
- More particularly, in a {circle around (1)} of
FIG. 3 , thecontrol unit 120 detects an atmospheric pressure, a vehicle speed, an engine speed, an intake air temperature, a coolant temperature, a gear speed, a fuel injection amount, and an exhaust gas temperature (T6 or T7), determines whether the rapid-heat-up function is to be performed or not, and monitors the condition that the rapid-heat-up function is being performed. - It is determined whether the rapid-heat-up function is ON or OFF in a S210 of
FIG. 2 , and it is determined whether an injection signal for performing the rapid-heat-up function is activated or not in a S220. - The injection signal includes an operating signal that is transferred from the
control unit 120 to operate theinjector 110 such that a post injection is performed. - An error of the components for performing the rapid-heat-up logic is detected in a S230. Referring to {circle around (4)} of
FIG. 3 , theinjector 110 and the temperature sensor (T3 to T7) are used so as to perform the rapid-heat-up, if theinjector 110 or the temperature sensor (T3 to T7) malfunctions or breaks down, thecontrol unit 120 generates an error signal of the components for the rapid-heat-up. - In a S240, a temperature of the exhaust gas is detected during the rapid-heat-up, the detected temperature is compared to a modeled temperature, and it is determined whether the temperature of the exhaust gas ranges in a predetermined temperature area.
- If the rapid-heat-up function is over in a S250, the monitoring ends to output result thereof. Referring to {circle around (5)} and {circle around (6)} of
FIG. 3 , the rapid-heat-up function is evaluated by detecting the temperature of the exhaust gas through the temperature sensor. - More particularly, if the exhaust gas temperature exceeds a predetermined temperature range during the monitoring, an error signal is generated, the generated error signal is counted, and the counted number is stored.
- Further, if the counted number exceeds a predetermined or modeled value, it is determined that the rapid-heat-up logic is abnormally operated to activate a warning lamp, for example, a malfunction indicator lamp (MIL).
-
FIG. 4 is a graph showing a temperature of exhaust gas and a diagnosis function thereof in a condition that a rapid-heat-up logic process is performed according to various embodiments of the present invention. - Referring to
FIG. 4 , a horizontal axis indicates time, and a vertical axis indicates a temperature of the exhaust gas flowing into the selectivecatalyst reduction unit 180. - As shown, a range of the
RUH model temperature 400 is set by a predetermined map data, and a graph of theexhaust gas temperature 410 flowing into the selectivecatalyst reduction unit 180 is formed during the ON condition of the RHU. Further, a graph of theexhaust gas temperature 420 is formed during the OFF condition of the RUH. - In addition, a modeled
temperature 430 of the exhaust gas is formed by a driving condition of the engine and the rapid-heat-up logic, and anerror signal 440 is generated, if atemperature 410 exceeds the modeledtemperature 430 and thepredetermined temperature range 400. - The
control unit 120 counts the error signal and stores the counted number, and if the counted number exceeds a predetermined or modeled value, activates a warning lamp (MIL). - For convenience in explanation and accurate definition in the appended claims, the terms “front” or “rear”, and etc. are used to describe features of the exemplary embodiments with reference to the positions of such features as displayed in the figures.
- The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and their practical application, to thereby enable others skilled in the art to make and utilize various exemplary embodiments of the present invention, as well as various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the Claims appended hereto and their equivalents.
Claims (8)
1. An exhaust gas post processing method, comprising:
determining whether a driving condition requires a rapid-heat-up (RHU) logic process to quickly raise a temperature of exhaust gas passing through an exhaust line;
detecting an on/off signal that performs or stops the rapid-heat-up logic process;
determining whether an injection signal for performing the rapid-heat-up logic process is activated or not;
detecting an error status of one or more components for performing the rapid-heat-up logic process; and
detecting the temperature of the exhaust during the rapid-heat-up logic process and comparing the detected temperature with a modeled value.
2. The exhaust gas post processing method of claim 1 , further comprising:
outputting an error signal when the detected temperature that is raised by the rapid-heat-up logic process various from the modeled value.
3. The exhaust gas post processing method of claim 2 , further comprising:
accumulating the error signal, and
storing the accumulated value and activating a rapid-heat-up logic warning lamp, if the accumulated value exceeds a predetermined value.
4. The exhaust gas post processing method of claim 1 , wherein the driving condition for entering into the rapid-heat-up logic process is determined based on an atmospheric pressure, a vehicle speed, an engine speed, an intake air temperature, a coolant temperature, a gear speed, and a fuel injection amount.
5. The exhaust gas post processing method of claim 4 , wherein if the condition for entering into the rapid-heat-up logic process is satisfied, a post injection amount for performing the rapid-heat-up logic process is determined based on the engine speed and the fuel injection amount to inject the fuel.
6. The exhaust gas post processing method of claim 1 , wherein one of the components includes an injector injecting the fuel and a temperature sensor detecting the temperature of the exhaust gas in a step of the detecting the error of the component.
7. The exhaust gas post processing method of claim 1 , wherein:
a diesel oxidation catalyst oxidizes harmful materials included in the exhaust gas;
a diesel particulate filter that filters particulate matters included in the exhaust gas;
a dosing module that injects reducing agent into the exhaust gas passing the exhaust line; and
a selective catalyst reduction unit (SCR) that uses the reducing agent injected by the dosing module to reduce/oxidize nitrogen oxide included in the exhaust gas are sequentially disposed on the exhaust line.
8. The exhaust gas post processing method of claim 7 , wherein:
a temperature sensor detects temperatures of a rear side of the engine, a front side of the diesel oxidation catalyst, a front side of the diesel particulate filter, and a front side of the selective catalyst reduction unit.
Applications Claiming Priority (2)
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KR10-2010-0120936 | 2010-11-30 | ||
KR1020100120936A KR101251515B1 (en) | 2010-11-30 | 2010-11-30 | Exhaust gas post processing method |
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US20120131905A1 true US20120131905A1 (en) | 2012-05-31 |
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US13/168,217 Abandoned US20120131905A1 (en) | 2010-11-30 | 2011-06-24 | Exhaust gas post processing method |
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US (1) | US20120131905A1 (en) |
JP (1) | JP2012117512A (en) |
KR (1) | KR101251515B1 (en) |
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US20170003179A1 (en) * | 2015-06-30 | 2017-01-05 | Hyundai Motor Company | Fault diagnosis system and method of exhaust gas temperature sensor of hybrid vehicle |
US9870651B1 (en) | 2016-07-25 | 2018-01-16 | Robert Bosch Gmbh | Diagnostic testing of rapid heat up of an exhaust sytem during engine decompression |
US11636870B2 (en) | 2020-08-20 | 2023-04-25 | Denso International America, Inc. | Smoking cessation systems and methods |
US11760169B2 (en) | 2020-08-20 | 2023-09-19 | Denso International America, Inc. | Particulate control systems and methods for olfaction sensors |
US11760170B2 (en) | 2020-08-20 | 2023-09-19 | Denso International America, Inc. | Olfaction sensor preservation systems and methods |
US11813926B2 (en) | 2020-08-20 | 2023-11-14 | Denso International America, Inc. | Binding agent and olfaction sensor |
US11828210B2 (en) | 2020-08-20 | 2023-11-28 | Denso International America, Inc. | Diagnostic systems and methods of vehicles using olfaction |
US11881093B2 (en) | 2020-08-20 | 2024-01-23 | Denso International America, Inc. | Systems and methods for identifying smoking in vehicles |
US11932080B2 (en) | 2020-08-20 | 2024-03-19 | Denso International America, Inc. | Diagnostic and recirculation control systems and methods |
US12017506B2 (en) | 2020-08-20 | 2024-06-25 | Denso International America, Inc. | Passenger cabin air control systems and methods |
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Also Published As
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JP2012117512A (en) | 2012-06-21 |
DE102011051476A1 (en) | 2012-05-31 |
KR20120059265A (en) | 2012-06-08 |
CN102477888A (en) | 2012-05-30 |
KR101251515B1 (en) | 2013-04-05 |
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