CN117248987A - Control device and method for avoiding HC poisoning of catalyst in real time - Google Patents
Control device and method for avoiding HC poisoning of catalyst in real time Download PDFInfo
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- CN117248987A CN117248987A CN202311431167.9A CN202311431167A CN117248987A CN 117248987 A CN117248987 A CN 117248987A CN 202311431167 A CN202311431167 A CN 202311431167A CN 117248987 A CN117248987 A CN 117248987A
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- catalyst
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- 239000003054 catalyst Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 34
- 231100000572 poisoning Toxicity 0.000 title claims abstract description 28
- 230000000607 poisoning effect Effects 0.000 title claims abstract description 28
- 238000009825 accumulation Methods 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 20
- 238000002347 injection Methods 0.000 claims abstract description 9
- 239000007924 injection Substances 0.000 claims abstract description 9
- 230000001052 transient effect Effects 0.000 claims abstract description 7
- 230000001133 acceleration Effects 0.000 claims abstract description 4
- 230000003197 catalytic effect Effects 0.000 claims abstract description 4
- 238000012937 correction Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 230000015556 catabolic process Effects 0.000 claims description 3
- 238000006731 degradation reaction Methods 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000011217 control strategy Methods 0.000 abstract description 3
- 208000005374 Poisoning Diseases 0.000 description 19
- 239000000446 fuel Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000003745 diagnosis Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- 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
-
- 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
-
- 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
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2550/00—Monitoring or diagnosing the deterioration of exhaust systems
- F01N2550/02—Catalytic activity of catalytic converters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/026—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting NOx
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/12—Hydrocarbons
-
- 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
Landscapes
- 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)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention discloses a control device and a method for avoiding HC poisoning of a catalyst in real time, wherein the control method comprises the following steps: obtaining HC emission under different working conditions, and establishing a steady-state model of HC emission; determining a correction coefficient of HC in a transient acceleration process; determining a current HC conversion efficiency of the catalyst; determining an HC accumulation amount at a minimum efficiency limit allowable for the conversion efficiency of the catalyst based on the characteristics of the catalyst and the routability of the emission; the injection parameters of the engine are adjusted, and the timing, rail pressure, throttle valve and post-injection quantity enable the temperature sensed by the catalytic T4 temperature sensor to be higher than 300 ℃; and estimating the conversion efficiency of the current catalyst in real time, and calculating the current HC accumulation amount until the HC accumulation amount is less than the limit value of the HC accumulation amount. Therefore, the HC in the catalyst can be removed through a reasonable control strategy, the conversion efficiency of the catalyst can be recovered, the triggering torque limiting strategy can be reduced, and the complaints of users are reduced.
Description
Technical Field
The invention relates to the field of engine design and manufacturing, in particular to a control device and method for avoiding HC poisoning of a catalyst in real time.
Background
With the increasing emissions regulations, state six diesel engines have used complex aftertreatment systems to reduce emissions of pollutants such as NOx, PM, and PN in the exhaust. Because the scene is complex in the use process, and the oil quality residual error is uneven. With poisoning of the catalyst itself and reduced catalyst efficiency. The emission exceeds the alarm limit value of OBD, and strategies such as torque limiting and the like are triggered, so that customer complaints are caused.
Among the causes of the decrease in catalyst efficiency, catalyst HC poisoning is a common failure mode, in which diesel engines are operated at medium to small loads and idle due to the edge region of fuel injection, HC is generated due to lean air and low in-cylinder combustion temperature, and in the region of low air-fuel ratio at large load, more HC emissions are generated due to insufficient combustion of fuel. When HC in the tail gas passes through the catalyst, the HC is adsorbed on the surface of the catalyst, so that the catalyst cannot react with pollutants in the tail gas, and is commonly called poisoning. However, HC poisoning is reversible, and through a reasonable control strategy, not only can HC in the catalyst be cleared, and the conversion efficiency of the catalyst be recovered, but also trigger torque limiting strategies can be reduced, and user complaints can be reduced.
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 of ordinary skill in the art.
Disclosure of Invention
The invention aims to provide a control device and a control method for avoiding HC poisoning of a catalyst in real time, which can not only clear HC in the catalyst and recover the conversion efficiency of the catalyst through a reasonable control strategy, but also reduce triggering torque limiting strategies and reduce complaints of users.
In order to achieve the above object, the present invention provides a control device for avoiding HC poisoning of a catalyst in real time, including a T4 temperature sensor and a NOx sensor; the T4 temperature sensor is arranged at the joint of the exhaust device and the DOC+DPF; the NOx sensor is arranged at the joint of the exhaust device and the DOC+DPF.
In a preferred embodiment, the method further comprises SCR+ASC sequentially connected with DOC+DPF.
In order to achieve the above object, the present invention further provides a control method for avoiding HC poisoning of a catalyst in real time, which employs the control device as described above, and the control method includes: step one, enabling tail gas of an engine to sequentially pass through a T4 temperature sensor, DOC, DPF, SCR and ASC; step two, HC emission under different working conditions is obtained through a steady-state test of a rack, and a steady-state model of HC emission is established; step three, combining transient calibration of a rack and lambda value obtained from a NOx sensor in tail gas to determine a correction coefficient of HC in a transient acceleration process; determining the HC conversion efficiency of the current catalyst through the characteristics of the catalyst, the current exhaust flow, the current exhaust temperature, the current oxygen concentration and the current degradation coefficient; fifthly, determining the HC accumulation amount at the lowest efficiency limit value allowed by the conversion efficiency of the catalyst according to the characteristics of the catalyst and the route property of the emission; step six, the temperature sensed by a catalytic T4 temperature sensor is higher than 300 ℃ through adjusting the injection parameters of the engine, the timing, the rail pressure, the throttle valve and the post-injection quantity; and step seven, according to the new working state of the engine, the conversion efficiency of the current catalyst is estimated in real time, and the current HC accumulation amount is calculated until the HC accumulation amount is smaller than the limit value of the HC accumulation amount.
In a preferred embodiment, the control method further comprises: the accumulated HC emission amount in the present catalyst is obtained through the step two and the step three.
In a preferred embodiment, the control method further comprises: the HC emission amount accumulated in the catalyst can be obtained by obtaining the accumulated HC emission amount in the current catalyst through the second and third steps, and the HC conversion efficiency obtained through the fourth step, and the actual HC accumulation amount can be obtained by integrating and accumulating the HC emission amount accumulated in the catalyst in real time.
In a preferred embodiment, the control method further comprises: and (3) comparing the actual HC accumulation amount with the HC accumulation amount obtained in the step (V), and triggering a HC removal program if the limit value is exceeded.
In a preferred embodiment, the control method further comprises: if the temperature sensed by the T4 temperature sensor is not greater than 300 ℃, then the loop is closed in real time until the T4 temperature reaches greater than 300 ℃.
Compared with the prior art, the control device and method for avoiding HC poisoning of the catalyst in real time have the following beneficial effects: the scheme combines the characteristics of emission and a catalyst to determine the boundary of HC poisoning; triggering a HC removal program according to comparison between the HC accumulation amount of the actual catalyst and the HC poisoning boundary; the HC removing mode is provided, and the exhaust temperature is improved by adopting a mode of adjusting engine control parameters; the influence caused by the deterioration of the efficiency of the catalyst is eliminated, the HC poisoning diagnosis accuracy is improved, the performance of the catalyst is recovered in time, the conversion efficiency of tail gas is improved, and the user complaints caused by limiting torque are reduced.
Drawings
FIG. 1 is a schematic view of an arrangement of a control device according to an embodiment of the present invention;
fig. 2 is a control flow diagram of a control method according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.
As shown in fig. 1, a control device for avoiding HC poisoning of a catalyst in real time according to a preferred embodiment of the present invention includes a T4 temperature sensor and a NOx sensor; the T4 temperature sensor is arranged at the joint of the exhaust device and the DOC+DPF; the NOx sensor is arranged at the joint of the exhaust device and the DOC+DPF.
In some embodiments, the method further comprises scr+asc sequentially engaged with the doc+dpf. The exhaust gas of the diesel engine passes through a T4 temperature sensor, a NOx sensor, a DOC, DPF, SCR, ASC device and the like and is discharged.
As shown in fig. 2, a control method for avoiding HC poisoning of a catalyst in real time according to a preferred embodiment of the present invention, which employs the control device as described above, includes: step one, enabling tail gas of an engine to sequentially pass through a T4 temperature sensor, DOC, DPF, SCR and ASC; step two, HC emission under different working conditions is obtained through a steady-state test of a rack, and a steady-state model of HC emission is established; step three, combining transient calibration of a rack and lambda value obtained from a NOx sensor in tail gas to determine a correction coefficient of HC in a transient acceleration process; determining the HC conversion efficiency of the current catalyst through the characteristics of the catalyst, the current exhaust flow, the current exhaust temperature, the current oxygen concentration and the current degradation coefficient; fifthly, determining the HC accumulation amount at the lowest efficiency limit value allowed by the conversion efficiency of the catalyst according to the characteristics of the catalyst and the route property of the emission; step six, the temperature sensed by a catalytic T4 temperature sensor is higher than 300 ℃ through adjusting the injection parameters of the engine, the timing, the rail pressure, the throttle valve and the post-injection quantity; and step seven, according to the new working state of the engine, the conversion efficiency of the current catalyst is estimated in real time, and the current HC accumulation amount is calculated until the HC accumulation amount is smaller than the limit value of the HC accumulation amount.
In some embodiments, the control method further comprises: the accumulated HC emission amount in the present catalyst is obtained through the step two and the step three.
In some embodiments, the control method further comprises: the HC emission amount accumulated in the catalyst can be obtained by obtaining the accumulated HC emission amount in the current catalyst through the second and third steps, and the HC conversion efficiency obtained through the fourth step, and the actual HC accumulation amount can be obtained by integrating and accumulating the HC emission amount accumulated in the catalyst in real time.
In some embodiments, the control method further comprises: and (3) comparing the actual HC accumulation amount with the HC accumulation amount obtained in the step (V), and triggering a HC removal program if the limit value is exceeded.
In some embodiments, the control method further comprises: if the temperature sensed by the T4 temperature sensor is not greater than 300 ℃, then the loop is closed in real time until the T4 temperature reaches greater than 300 ℃.
In summary, the control device and method for avoiding HC poisoning of the catalyst in real time have the following advantages: the scheme combines the characteristics of emission and a catalyst to determine the boundary of HC poisoning; triggering a HC removal program according to comparison between the HC accumulation amount of the actual catalyst and the HC poisoning boundary; the HC removing mode is provided, and the exhaust temperature is improved by adopting a mode of adjusting engine control parameters; the influence caused by the deterioration of the efficiency of the catalyst is eliminated, the HC poisoning diagnosis accuracy is improved, the performance of the catalyst is recovered in time, the conversion efficiency of tail gas is improved, and the user complaints caused by limiting torque are reduced.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (7)
1. A control device for avoiding HC poisoning of a catalyst in real time, comprising:
a T4 temperature sensor arranged at the joint of the exhaust device and the DOC+DPF; and
a NOx sensor is arranged at the joint of the exhaust device and the DOC+DPF.
2. The control device for avoiding HC poisoning of a catalyst in real time according to claim 1, further comprising an scr+asc sequentially engaged with the doc+dpf.
3. A control method for avoiding HC poisoning of a catalyst in real time, using the control device according to any of claims 1 to 2, characterized in that the control method comprises:
step one, enabling the tail gas of an engine to sequentially pass through the T4 temperature sensor, the DOC, DPF, SCR and the ASC;
step two, HC emission under different working conditions is obtained through a steady-state test of a rack, and a steady-state model of HC emission is established;
step three, combining transient calibration of a rack and lambda value obtained from a NOx sensor in tail gas to determine a correction coefficient of HC in a transient acceleration process;
determining the HC conversion efficiency of the current catalyst through the characteristics of the catalyst, the current exhaust flow, the current exhaust temperature, the current oxygen concentration and the current degradation coefficient;
fifthly, determining the HC accumulation amount at the lowest efficiency limit value allowed by the conversion efficiency of the catalyst according to the characteristics of the catalyst and the route property of the emission;
step six, the temperature sensed by a catalytic T4 temperature sensor is higher than 300 ℃ through adjusting the injection parameters of the engine, the timing, the rail pressure, the throttle valve and the post-injection quantity; and
and step seven, according to the working state of the new engine, the conversion efficiency of the current catalyst is estimated in real time, and the current HC accumulation amount is calculated until the HC accumulation amount is smaller than the limit value of the HC accumulation amount.
4. A control method for avoiding catalyst HC poisoning in real time according to claim 3, characterized in that the control method further comprises: the accumulated HC emission amount in the present catalyst is obtained through the step two and the step three.
5. A control method for avoiding catalyst HC poisoning in real time according to claim 3, characterized in that the control method further comprises: the HC emission amount accumulated in the catalyst can be obtained by obtaining the accumulated HC emission amount in the current catalyst through the second and third steps, and the HC conversion efficiency obtained through the fourth step, and the actual HC accumulation amount can be obtained by integrating and accumulating the HC emission amount accumulated in the catalyst in real time.
6. The control method for avoiding catalyst HC poisoning in real time according to claim 5, further comprising: and (3) comparing the actual HC accumulation amount with the HC accumulation amount obtained in the step (V), and triggering a HC removal program if the limit value is exceeded.
7. A control apparatus for avoiding catalyst HC poisoning in real time as defined in claim 3, further comprising: if the temperature sensed by the T4 temperature sensor is not greater than 300 ℃, then the loop is closed in real time until the T4 temperature reaches greater than 300 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311431167.9A CN117248987A (en) | 2023-10-31 | 2023-10-31 | Control device and method for avoiding HC poisoning of catalyst in real time |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311431167.9A CN117248987A (en) | 2023-10-31 | 2023-10-31 | Control device and method for avoiding HC poisoning of catalyst in real time |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117248987A true CN117248987A (en) | 2023-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311431167.9A Pending CN117248987A (en) | 2023-10-31 | 2023-10-31 | Control device and method for avoiding HC poisoning of catalyst in real time |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117248987A (en) |
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2023
- 2023-10-31 CN CN202311431167.9A patent/CN117248987A/en active Pending
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