CN113803182B - SCR system performance recovery method and device, storage medium and vehicle - Google Patents
SCR system performance recovery method and device, storage medium and vehicle Download PDFInfo
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- CN113803182B CN113803182B CN202010555432.4A CN202010555432A CN113803182B CN 113803182 B CN113803182 B CN 113803182B CN 202010555432 A CN202010555432 A CN 202010555432A CN 113803182 B CN113803182 B CN 113803182B
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- 238000000034 method Methods 0.000 title claims abstract description 73
- 238000011084 recovery Methods 0.000 title claims abstract description 21
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 176
- 230000008929 regeneration Effects 0.000 claims abstract description 110
- 238000011069 regeneration method Methods 0.000 claims abstract description 110
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 99
- 230000023556 desulfurization Effects 0.000 claims abstract description 99
- 238000006243 chemical reaction Methods 0.000 claims abstract description 88
- 238000002347 injection Methods 0.000 claims abstract description 49
- 239000007924 injection Substances 0.000 claims abstract description 49
- 239000000446 fuel Substances 0.000 claims abstract description 40
- 238000011282 treatment Methods 0.000 claims abstract description 36
- 230000003197 catalytic effect Effects 0.000 claims abstract description 10
- 239000003054 catalyst Substances 0.000 claims description 40
- 230000003647 oxidation Effects 0.000 claims description 34
- 238000007254 oxidation reaction Methods 0.000 claims description 34
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 24
- 239000004202 carbamide Substances 0.000 claims description 24
- 230000008859 change Effects 0.000 claims description 24
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 20
- 229910052717 sulfur Inorganic materials 0.000 claims description 20
- 239000011593 sulfur Substances 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 19
- 238000004422 calculation algorithm Methods 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 8
- 238000004590 computer program Methods 0.000 claims description 4
- 239000007789 gas Substances 0.000 abstract description 11
- 238000010531 catalytic reduction reaction Methods 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 19
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 10
- 229910052802 copper Inorganic materials 0.000 description 10
- 239000010949 copper Substances 0.000 description 10
- 239000000126 substance Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/008—Mounting or arrangement of exhaust sensors in or on 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
-
- 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
- F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
- F02D41/0275—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a NOx trap or adsorbent
- F02D41/028—Desulfurisation of NOx traps or adsorbent
-
- 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
- F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
- F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
Abstract
The application relates to the technical field of vehicle tail gas treatment, in particular to a method and a device for recovering performance of an SCR (selective catalytic reduction) system, a storage medium and a vehicle, and solves the problem that in the prior art, the regeneration time of the recovery performance of the SCR system cannot be determined according to the conversion efficiency of the SCR system to nitrogen oxides. The method comprises the following steps: obtaining the conversion efficiency of the SCR system to nitrogen oxides; determining target desulfurization regeneration times according to the conversion efficiency; sending a parking regeneration request; acquiring the average desulfurization regeneration time length and a first vehicle operation parameter in a parking state; obtaining the total duration for executing the desulfurization regeneration treatment according to the target desulfurization regeneration times and the desulfurization regeneration average duration; judging whether the first vehicle operation parameters meet a first preset enabling condition or not; when the first vehicle operation parameters meet a first preset enabling condition, controlling the regenerated fuel injection quantity so that the SCR system carries out desulfurization regeneration treatment according to the total duration at a preset temperature, and recovering the catalytic performance of the SCR system.
Description
Technical Field
The application relates to the technical field of vehicle tail gas treatment, in particular to a method and a device for recovering performance of an SCR (selective catalytic reduction) system, a storage medium and a vehicle.
Background
With the development of social economy, the national importance of environmental protection is higher, and according to different regional requirements, the national six products will also log in the market successively, so as to meet the discharge requirements of the national six, various diesel engine manufacturers commonly adopt DOC (Diesel oxidation catalyst ) +dpf (Diesel Particulate Filter, particle catcher) +scr (Selective Catalytic Reduction, selective catalytic reduction system) control strategies, wherein in order to meet the emission limit of NOX (nitrogen oxides), the SCR system is required to have a conversion efficiency of up to 99% for NOX.
The copper-based SCR carrier can well meet the requirement of NOX emission, particularly has excellent low-temperature performance, but the copper-based SCR carrier is very sensitive to sulfur content in fuel, and needs to meet the national six fuel with sulfur content lower than 10ppm, so that the copper-based SCR carrier fails, but the quality of the fuel in China is uneven at present, the sulfur content of the fuel in some areas reaches hundreds or thousands ppm, a large number of copper-based SCR catalysts fail, NOX conversion efficiency is reduced after the copper-based SCR carrier fails, speed limit and torque limit of vehicles are caused, and huge economic losses are brought to customers and engine manufacturers.
At present, the performance of the SCR system is recovered through high Wen Zhuche when the conversion efficiency of the SCR system to NOX is low in the prior art, but the performance of the SCR system cannot be recovered to the optimal state due to the short regeneration time because the performance regeneration time of the SCR system cannot be accurately controlled according to the conversion capability of the SCR system to NOX at present, so that the problem of low conversion efficiency to NOX is caused; long regeneration times can lead to long parking times for users, affecting user experience.
Disclosure of Invention
The application provides a method and a device for recovering performance of an SCR system, a storage medium and a vehicle, and solves the problem that in the prior art, the regeneration time of the recovery performance of the SCR system cannot be determined according to the conversion efficiency of the SCR system to nitrogen oxides.
In a first aspect, the present application provides a method for recovering performance of an SCR system, the method comprising:
obtaining the conversion efficiency of the SCR system to nitrogen oxides;
determining target desulfurization regeneration times according to the conversion efficiency;
sending a parking regeneration request;
acquiring the average desulfurization regeneration time length and a first vehicle operation parameter in a parking state;
obtaining the total duration for executing the desulfurization regeneration treatment according to the target desulfurization regeneration times and the desulfurization regeneration average duration;
judging whether the first vehicle operation parameter meets a first preset enabling condition or not;
when the first vehicle operation parameters meet a first preset enabling condition, controlling the regenerated fuel injection quantity so that the SCR system carries out desulfurization regeneration treatment according to the total duration at a preset temperature, and recovering the catalytic performance of the SCR system.
According to an embodiment of the present application, optionally, in the above method for recovering SCR system performance, determining the target desulfurization regeneration number according to the conversion efficiency includes:
obtaining a desulfurization information corresponding table, wherein the desulfurization information corresponding table comprises a plurality of preset conversion efficiencies and preset desulfurization regeneration times corresponding to each preset conversion efficiency;
searching a preset conversion efficiency matched with the conversion efficiency in the desulfurization information corresponding table, and taking the preset desulfurization regeneration times corresponding to the preset conversion efficiency as target desulfurization regeneration times.
According to an embodiment of the present application, optionally, in the above SCR system performance recovery method, when the sulfur removal information correspondence table further includes a fuel sulfur content corresponding to each of the preset conversion efficiencies, the method further includes:
searching a preset conversion efficiency matched with the conversion efficiency in the desulfurization information corresponding table, and displaying the fuel sulfur content corresponding to the preset conversion efficiency on a vehicle instrument panel.
According to an embodiment of the present application, optionally, in the above SCR system performance recovery method, when the first vehicle operation parameter includes a vehicle speed, a clutch working state, an accelerator signal, a parking brake state, a brake signal, an SCR system working state, an engine working state, and an engine speed, determining whether the first vehicle operation parameter meets a first preset enabling condition includes:
judging whether the vehicle speed is 0, judging whether the clutch working state is a preset clutch working state, judging whether the accelerator signal is 0, judging whether the parking braking state is an on state, judging whether the brake signal is 0, judging whether the SCR system working state is a preset SCR system working state, judging whether the engine working state is a preset engine working state, and judging whether the engine rotating speed is in a first preset rotating speed range.
According to an embodiment of the present application, optionally, in the above method for recovering performance of an SCR system, controlling a regenerated fuel injection amount includes:
and controlling the PID controller to adjust the regenerated fuel injection quantity according to the preset temperature, the real-time temperature of the front end of the diesel oxidation catalyst, the real-time temperature of the rear end of the diesel oxidation catalyst and a preset fuel injection quantity control algorithm so as to maintain the real-time temperature of the rear end of the diesel oxidation catalyst at the preset temperature within the total duration.
According to an embodiment of the present application, optionally, in the above method for recovering performance of an SCR system, before obtaining conversion efficiency of the SCR system to nitrogen oxides, the method further includes:
acquiring a second vehicle operation parameter in a vehicle operation state;
judging whether the second vehicle operation parameter meets a second preset enabling condition or not;
and executing the step of acquiring the conversion efficiency of the SCR system to the nitrogen oxides when the second vehicle operation parameter meets a second preset enabling condition.
According to an embodiment of the present application, optionally, in the above SCR system performance recovery method, when the second vehicle operation parameter includes an engine operation state, an engine speed change rate, an engine torque change rate, an operation state of a urea injection device, a urea injection amount, an operation state of a nitrogen oxide sensor, and an operation state of a temperature sensor, determining whether the second vehicle operation parameter meets a second preset enabling condition includes:
judging whether the engine working state is a preset engine working state, judging whether the engine rotating speed is in a second preset rotating speed range, judging whether the engine rotating speed change rate is in a preset rotating speed change rate range, judging whether the engine torque is in a preset torque range, judging whether the engine torque change rate is in a preset torque change rate range, judging whether the working state of the urea injection device is a preset urea device working state, judging whether the urea injection quantity is in a preset injection quantity range, judging whether the working state of the nitrogen oxide sensor is a first preset sensor working state, and judging whether the working state of the temperature sensor is a second preset sensor working state.
In a second aspect, the present application provides an SCR system performance recovery apparatus, the apparatus comprising:
the first acquisition module is used for acquiring the conversion efficiency of the SCR system to nitrogen oxides;
the determining module is used for determining target desulfurization regeneration times according to the conversion efficiency;
the sending module is used for sending a parking regeneration request;
the second acquisition module is used for acquiring the average desulfurization regeneration duration and the first vehicle operation parameters in the parking state;
the calculation module is used for obtaining the total duration for executing the desulfurization regeneration treatment according to the target desulfurization regeneration times and the desulfurization regeneration average duration;
the judging module is used for judging whether the first vehicle operation parameters meet a first preset enabling condition or not;
and the regeneration module is used for controlling the regenerated fuel injection quantity when the first vehicle operation parameter meets a first preset enabling condition so as to enable the SCR system to carry out desulfurization regeneration treatment according to the total duration at a preset temperature and recover the catalytic performance of the SCR system.
In a third aspect, the present application provides a storage medium storing a computer program which, when executed by one or more processors, implements an SCR system performance recovery method as in the first aspect described above.
In a fourth aspect, the present application provides a vehicle comprising:
an engine;
an exhaust manifold, an inlet end of the exhaust manifold being connected to the engine;
the front end of the diesel oxidation catalyst is connected with the outlet end of the exhaust manifold, the front end of the diesel oxidation catalyst is provided with a nitrogen oxide sensor, and the front end and the rear end of the diesel oxidation catalyst are both provided with temperature sensors;
the front end of the particle catcher is connected with the rear end of the diesel oxidation catalyst;
the front end of the SCR system is connected with the rear end of the particle catcher, the rear end of the SCR system is provided with a nitrogen oxide sensor, and the front end and the rear end of the SCR system are both provided with temperature sensors;
and a processor, connected with the engine, the temperature sensor and the nitrogen oxide sensor, for executing the SCR system performance recovery method as in the first aspect.
One or more embodiments of the above-described solution may have the following advantages or benefits compared to the prior art:
the application provides a method and a device for recovering performance of an SCR system, a storage medium and a vehicle, wherein the method comprises the following steps: obtaining the conversion efficiency of the SCR system to nitrogen oxides; determining target desulfurization regeneration times according to the conversion efficiency; sending a parking regeneration request; acquiring the average desulfurization regeneration time length and a first vehicle operation parameter in a parking state; obtaining the total duration for executing the desulfurization regeneration treatment according to the target desulfurization regeneration times and the desulfurization regeneration average duration; judging whether the first vehicle operation parameter meets a first preset enabling condition or not; when the first vehicle operation parameters meet a first preset enabling condition, controlling the regenerated fuel injection quantity so that the SCR system carries out desulfurization regeneration treatment according to the total duration at a preset temperature, and recovering the catalytic performance of the SCR system. According to the method, the conversion efficiency of the SCR system to NOX is obtained in real time, the time of desulfurization and regeneration treatment of the SCR system is determined, the condition that the SCR system is incomplete in performance recovery due to the fact that the time of desulfurization and regeneration treatment is too short or the SCR system is unnecessarily parked for a long time due to the fact that the time of desulfurization and regeneration treatment is too long is avoided, and the conversion efficiency of the SCR system to NOX is ensured.
Drawings
The present application will be described in more detail hereinafter based on embodiments and with reference to the accompanying drawings.
Fig. 1 is a flowchart of an SCR system performance recovery method according to an embodiment of the present application.
Fig. 2 is a schematic diagram of hardware connection of a vehicle according to a fourth embodiment of the present application.
Reference numerals: 1-engine, 2-exhaust manifold, 3-exhaust line, 4-first nitrogen oxide sensor, 5-particle trap, 6-second nitrogen oxide sensor, 7-first temperature sensor, 8-second temperature sensor, 9-third temperature sensor, 10-differential pressure sensor, 11-fourth temperature sensor, 12-fifth temperature sensor, 13-diesel oxidation catalyst, 14-SCR system.
In the drawings, like parts are given like reference numerals, and the drawings are not drawn to scale.
Detailed Description
The following will describe embodiments of the present application in detail with reference to the drawings and examples, thereby how to apply technical means to the present application to solve technical problems, and realizing processes achieving corresponding technical effects can be fully understood and implemented accordingly. The embodiments and the features in the embodiments can be combined with each other under the condition of no conflict, and the formed technical schemes are all within the protection scope of the application.
In the art, an SCR system is a device for reducing NOX in exhaust gas of a diesel engine, and under the action of an SCR carrier, reducing agent ammonia or urea is injected to reduce NOX in the exhaust gas into nitrogen and water, so as to meet the emission requirements of automobiles.
Taking a copper-based SCR carrier as an example, a catalyst for promoting the acceleration treatment of tail gas is arranged on the copper-based SCR carrier, if the sulfur content in fuel oil is too high along with the long-time use of an SCR system, the surface of the copper-based SCR carrier is covered by other substances, so that the catalyst on the copper-based SCR carrier is invalid, and the conversion efficiency of the SCR system to NOX is reduced. Therefore, it is necessary to treat the surface of the copper-based SCR carrier to restore the catalytic performance of the SCR system.
Example 1
Referring to fig. 1, the present application provides an SCR system performance recovery method applicable to a processor in a vehicle, and the SCR system performance recovery method performs steps S110 to S170 when applied to the processor.
Step S110: and obtaining the conversion efficiency of the SCR system to the nitrogen oxides.
In this embodiment, the conversion efficiency of the SCR system to nitrogen oxides is reflected from the side due to the activity of the SCR carrier surface catalyst in the SCR system. Therefore, the performance of the catalyst in the SCR system can be reflected from the side surface by researching the conversion efficiency of the SCR system to the nitrogen oxides, and whether the performance of the SCR system needs to be recovered is judged according to the conversion efficiency of the SCR system to the nitrogen oxides.
In some embodiments, the conversion efficiency of the oxynitride may be calculated by a window average method. Specifically, the conversion efficiency is calculated by adopting a window average method according to the concentration of nitrogen oxides before the tail gas treatment, the concentration of nitrogen oxides after the tail gas treatment, the engine speed and the engine torque. The window averaging method is a technique well known to those skilled in the art, and the description of this embodiment is omitted.
It will be appreciated that in order to improve the robustness and reliability of the method, the method may be performed after ensuring that the conversion efficiency of the SCR system to NOX is low due to the use of fuel with high sulfur content, rather than the conversion efficiency of the SCR system to NOX due to other factors, i.e. the conversion efficiency of the SCR system to nitrogen oxides is obtained. In the present embodiment, it is considered that the value of the conversion efficiency directly affects the determination of the SCR system performance, and therefore, it is first necessary to ensure that there is no large error in the calculation of the conversion efficiency.
In the present embodiment, factors that affect conversion efficiency include, but are not limited to, engine operating conditions, engine speed, engine torque, operating conditions of the urea injection device, urea injection quantity, operating conditions of the nox sensor (including reading and its rate of change), operating conditions of the temperature chemical sensor (including reading and its rate of change). Whether the factors meet preset conditions or not can be judged, and further, after the conclusion that other factors do not influence the conversion efficiency is guaranteed, the conversion efficiency of the SCR system on NOX is obtained. Specific:
first, a second vehicle operating parameter in a vehicle operating state is obtained.
And secondly, judging whether the second vehicle operation parameter meets a second preset enabling condition, and executing the step of acquiring the conversion efficiency of the SCR system to the nitrogen oxides when the second vehicle operation parameter meets the second preset enabling condition.
It will be appreciated that each second vehicle operating parameter corresponds to a different second preset enabling condition. Therefore, determining whether the second vehicle operation parameter satisfies a second preset enabling condition specifically includes: judging whether the engine working state is a preset engine working state, judging whether the engine rotating speed is in a second preset rotating speed range, judging whether the engine rotating speed change rate is in a preset rotating speed change rate range, judging whether the engine torque is in a preset torque range, judging whether the engine torque change rate is in a preset torque change rate range, judging whether the working state of the urea injection device is a preset urea device working state, judging whether the urea injection quantity is in a preset injection quantity range, judging whether the working state of the nitrogen oxide sensor is a first preset sensor working state, and judging whether the working state of the temperature sensor is a second preset sensor working state.
Firstly, since the calculation of the conversion efficiency is related to the engine working state, the engine rotating speed and the engine torque, the engine working state needs to be ensured to be the normal working state, and no condition of any engine fault code can exist, so that whether the engine rotating speed is in a second preset rotating speed range, whether the engine rotating speed change rate is in a preset rotating speed change rate range, whether the engine torque is in a preset torque range and whether the engine torque change rate is in a preset torque change rate range is ensured. Secondly, considering that the working state and the urea injection amount of the urea injection device can also directly influence the conversion efficiency of NOX, the working state and the injection amount of the urea injection device need to be detected, and if the working state of the urea injection device is that the preset urea device working state and the urea injection amount are within the preset injection amount range, the working state and the injection amount of the urea injection device can be determined without influencing the calculation of the conversion efficiency. Then, consider again whether the nox sensor is in the first preset sensor operating state (including whether it is in the operating state and the range of the read value and whether the rate of change is within a certain range), and whether the temperature sensor is in the second preset sensor operating state (including whether it is in the operating state and the range of the read value and whether the rate of change is within a certain range). The nitrogen oxide sensor comprises a nitrogen oxide sensor arranged at the front end of the diesel oxidation catalyst and the rear end of the SCR system; the temperature sensor includes a temperature sensor disposed on the SCR system.
In the present embodiment, the setting of the values of the various conditions concerning the factors affecting the conversion efficiency may be set according to the actual requirements, and the present embodiment is not limited in any way.
Step S120: and determining target desulfurization regeneration times according to the conversion efficiency.
In this embodiment, different conversion efficiencies characterize different degrees of reduction of the exhaust by the SCR system. A desulfurization information corresponding table is preset, wherein the desulfurization information corresponding table comprises a plurality of preset conversion efficiencies and preset desulfurization regeneration times corresponding to each preset conversion efficiency. It can be understood that when the surface of the SCR carrier is covered with a larger area in the SCR system, the reduction degree of the SCR system on the tail gas is lower, and then multiple desulfurization regeneration treatments are needed, and the materials covered on the surface of the SCR carrier are treated for multiple times, so that the performance of the SCR system can be recovered to the optimal state.
In this embodiment, the preset conversion efficiency matched with the conversion efficiency is searched in the desulfurization information correspondence table, and the preset desulfurization regeneration number corresponding to the preset conversion efficiency is used as the target desulfurization regeneration number, which is the desulfurization regeneration number corresponding to the SCR system performance recovered to the optimal state.
It can be understood that the desulfurization information corresponding table may further include fuel sulfur content corresponding to each of the preset conversion efficiencies, the preset conversion efficiency matched with the conversion efficiency is searched in the desulfurization information corresponding table, the fuel sulfur content corresponding to the preset conversion efficiency is displayed on a vehicle instrument panel, the condition of fuel used by the vehicle is effectively monitored, reminding is provided for a driver, accidental use of fuel with high sulfur content by the driver is avoided, and convenience is provided for service claims.
In some embodiments, a correspondence between conversion efficiency and sulfur content and a correspondence between fuel sulfur content and desulfurization regeneration times may be further set, and after the fuel sulfur content is determined by the calculated conversion efficiency, the desulfurization regeneration times corresponding to the fuel sulfur content may be found by the determined fuel sulfur content as the target desulfurization regeneration times. The corresponding relation can be set according to the actual requirement, and the embodiment is not limited in any way.
Step S130: and sending a parking regeneration request.
In this embodiment, after the target number of desulfurization regenerations is determined, a request for parking regeneration may be sent to allow the driver to park the vehicle while seeing the request.
Step S140: and acquiring the average desulfurization regeneration time length and a first vehicle operation parameter in a parking state.
In this embodiment, in order to detect whether the vehicle is parked, it is necessary to acquire the first vehicle operation parameter in real time.
In this embodiment, the average desulfurization regeneration time period is obtained in order to determine the time at which the SCR system performs the desulfurization regeneration process.
In this example, the average duration of desulfurization regeneration was 30 minutes. The preset temperature may also be set according to the actual situation, which is not limited in this embodiment.
Step S150: and obtaining the total duration for executing the desulfurization regeneration treatment according to the target desulfurization regeneration times and the desulfurization regeneration average duration.
Step S160: and judging whether the first vehicle operation parameter meets a first preset enabling condition or not.
It will be appreciated that each second vehicle operating parameter corresponds to a different second preset enabling condition. Therefore, when the first vehicle operation parameter includes a vehicle speed, a clutch operating state, an accelerator signal, a parking brake state, a brake signal, an SCR system operating state, an engine operating state, and an engine speed, determining whether the first vehicle operation parameter satisfies a first preset enabling condition includes:
judging whether the vehicle speed is 0, judging whether the clutch working state is a preset clutch working state, judging whether the accelerator signal is 0, judging whether the parking braking state is an on state, judging whether the brake signal is 0, judging whether the SCR system working state is a preset SCR system working state, judging whether the engine working state is a preset engine working state, and judging whether the engine rotating speed is in a first preset rotating speed range. Wherein the preset clutch working state is a combination state; the working state of the preset SCR system is that no related faults exist; the first preset rotational speed range is the rotational speed range of the engine when the engine is in a low idle state.
Step S170: when the first vehicle operation parameters meet a first preset enabling condition, controlling the regenerated fuel injection quantity so that the SCR system carries out desulfurization regeneration treatment according to the total duration at a preset temperature, and recovering the catalytic performance of the SCR system.
In this embodiment, when the first vehicle operating parameter meets the first preset enabling condition, the regenerated fuel injection quantity is controlled, and the regenerated fuel injection quantity is oxidized to release heat when passing through the diesel oxidation catalyst, so as to ensure that the real-time temperature of the rear end of the diesel oxidation catalyst reaches a preset temperature, and at the preset temperature, the substance (sulfur-containing substance) covered on the SCR carrier by the SCR system is increased Wen Shaodiao, so as to recover the performance of the SCR system, and ensure the activity of the catalyst and the contact area with other substances.
In this embodiment, the regenerated fuel injection amount may be adjusted using PID. Specifically, the PID controller adjusts the regenerated fuel injection quantity according to a preset temperature, a real-time temperature of the front end of the diesel oxidation catalyst, a real-time temperature of the rear end of the diesel oxidation catalyst and a preset fuel injection quantity control algorithm, so that the real-time temperature of the rear end of the diesel oxidation catalyst is maintained at the preset temperature within the total duration. The preset fuel injection amount control algorithm is an algorithm well known to those skilled in the art, and therefore, this embodiment is not described in detail.
In this embodiment, the preset temperature is 600 ℃. The preset temperature may also be set according to the actual situation, which is not limited in this embodiment.
In this embodiment, according to the conversion efficiency of the SCR system to NOX obtained in real time, the time of the SCR system for desulfurization regeneration treatment is determined, so that the situation that the SCR system performance is not completely recovered due to too short time of desulfurization regeneration treatment or the SCR system is unnecessarily parked for a long time due to too long time of desulfurization regeneration treatment is avoided, the conversion efficiency of the SCR system to NOX is ensured, repeated inbound maintenance work of customers is not required, and the maintenance cost of drivers and merchants is reduced. And the development cost can be effectively reduced without changing the existing hardware or adding new hardware.
Example two
The embodiment provides an SCR system performance recovery device, which comprises a first acquisition module, a determination module, a sending module, a second acquisition module, a calculation module, a judgment module and a regeneration module. The first acquisition module is used for acquiring the conversion efficiency of the SCR system to nitrogen oxides; the determining module is used for determining target desulfurization regeneration times according to the conversion efficiency; the sending module is used for sending a parking regeneration request; the second acquisition module is used for acquiring the average desulfurization regeneration duration and the first vehicle operation parameters in the parking state; the calculation module is used for obtaining the total duration for executing the desulfurization regeneration treatment according to the target desulfurization regeneration times and the desulfurization regeneration average duration; the judging module is used for judging whether the first vehicle operation parameters meet a first preset enabling condition or not; and the regeneration module is used for controlling the regenerated fuel injection quantity when the first vehicle operation parameter meets a first preset enabling condition so as to enable the SCR system to carry out desulfurization regeneration treatment according to the total duration at a preset temperature and recover the catalytic performance of the SCR system.
The implementation process of the first acquisition module may refer to the implementation process of step S110 in the first embodiment, the implementation process of the determination module may refer to the implementation process of step S120 in the first embodiment, the implementation process of the sending module may refer to the implementation process of step S130 in the first embodiment, the implementation process of the second acquisition module may refer to the implementation process of step S140 in the first embodiment, the implementation process of the calculation module may refer to the implementation process of step S150 in the first embodiment, the implementation process of the determination module may refer to the implementation process of step S160 in the first embodiment, and the implementation process of the regeneration module may refer to the implementation process of step S170 in the first embodiment, which is not repeated herein.
Example III
The present embodiment also provides a storage medium, such as a flash memory, a hard disk, a multimedia card, a card memory (e.g., SD or DX memory, etc.), a Random Access Memory (RAM), a Static Random Access Memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, an optical disk, a server, an App application mall, etc., on which a computer program is stored, where the computer program may be executed by a processor to implement all or part of the steps of the SCR system performance recovery method described in the first embodiment, and the detailed embodiment procedure of all or part of the steps of the SCR system performance recovery method described in the first embodiment may be referred to as embodiment one, and the detailed description of the embodiment is not repeated here.
Example IV
The embodiment of the application provides a vehicle, which comprises:
an engine;
an exhaust manifold, an inlet end of the exhaust manifold being connected to the engine;
the front end of the diesel oxidation catalyst is connected with the outlet end of the exhaust manifold, the front end of the diesel oxidation catalyst is provided with a nitrogen oxide sensor, and the front end and the rear end of the diesel oxidation catalyst are both provided with temperature sensors;
the front end of the particle catcher is connected with the rear end of the diesel oxidation catalyst;
the front end of the SCR system is connected with the rear end of the particle catcher, the rear end of the SCR system is provided with a nitrogen oxide sensor, and the front end and the rear end of the SCR system are both provided with temperature sensors;
and a processor, connected to the engine, the temperature sensor, and the nitrogen oxide sensor, for performing all or part of the steps in the SCR system performance recovery method according to the first embodiment.
In this embodiment, the time for the SCR system to perform desulfurization regeneration treatment is determined according to the conversion efficiency of the SCR system to NOX obtained in real time, so that the situation that the SCR system is incomplete in performance recovery due to too short time of desulfurization regeneration treatment or the SCR system is unnecessarily parked for a long time due to too long time of desulfurization regeneration treatment is avoided, and the conversion efficiency of the SCR system to NOX is ensured.
As shown in fig. 2, the engine 1 is connected with an inlet end of the exhaust manifold 2, an outlet end of the exhaust manifold 2 is connected with a front end of the diesel oxidation catalyst 13 through the exhaust pipeline 3, a first nitrogen oxide sensor 4 is arranged on the front end, close to the diesel oxidation catalyst 13, of the exhaust pipeline 3, a rear end of the diesel oxidation catalyst 13 is connected with a front end of the particle catcher 5, a rear end of the particle catcher 5 is connected with a front end of the SCR system 14, the particle catcher 5 is provided with a differential pressure sensor 10, a second nitrogen oxide sensor 6 is arranged at the rear end of the SCR system 14, a first temperature sensor 7 and a second temperature sensor 8 are respectively arranged at the rear end and the front end of the SCR system 14, a third temperature sensor 9 is arranged at the rear end of the particle catcher 5, and a fourth temperature sensor 11 and a fifth temperature sensor 12 are respectively arranged at the rear end and the front end of the diesel oxidation catalyst 13.
In this embodiment, the processor controls the PID controller to adjust the regenerated fuel injection amount according to the preset temperature, the real-time temperature of the front end of the diesel oxidation catalyst (i.e., the temperature detected by the fifth temperature sensor 12), the real-time temperature of the rear end of the diesel oxidation catalyst (the temperature detected by the fourth temperature sensor 11), and the preset fuel injection amount control algorithm so that the real-time temperature of the rear end of the diesel oxidation catalyst (the temperature detected by the fourth temperature sensor 11) is maintained at the preset temperature for the total duration. The preset fuel injection amount control algorithm is an algorithm well known to those skilled in the art, and therefore, this embodiment is not described in detail.
In the present embodiment, the front end of the diesel oxidation catalyst 13 is provided with a first nitrogen oxide sensor 4 for detecting the concentration of untreated nitrogen oxides.
In this embodiment, the particle catcher 5 is provided with a differential pressure sensor 10 to detect a pressure difference across the particle catcher 5, and when the pressure difference is large, it is proved that the particle catcher 5 is clogged, and regeneration of the particle catcher 5 is required. The rear end of the particle catcher 5 is provided with a third temperature sensor 9 for detecting whether the temperature required for regeneration of the particle catcher 5 reaches a set temperature when regenerating the particle catcher 5.
In the present embodiment, a second nox sensor 6 is provided at the rear end of the SCR system 14 for detecting whether the treated exhaust gas emissions are acceptable. Because the SCR system needs to reach a certain temperature when treating the tail gas, the rear end and the front end of the SCR system 14 are respectively provided with a first temperature sensor 7 and a second temperature sensor 8 for detecting whether the temperature required by the SCR system when treating the tail gas reaches a set temperature, so as to avoid the problem that the SCR carrier is invalid due to urea crystallization caused by low temperature.
In summary, the method, the device, the storage medium and the vehicle for recovering the performance of the SCR system provided by the present application, the method includes: obtaining the conversion efficiency of the SCR system to nitrogen oxides; determining target desulfurization regeneration times according to the conversion efficiency; sending a parking regeneration request; acquiring the average desulfurization regeneration time length and a first vehicle operation parameter in a parking state; obtaining the total duration for executing the desulfurization regeneration treatment according to the target desulfurization regeneration times and the desulfurization regeneration average duration; judging whether the first vehicle operation parameter meets a first preset enabling condition or not; when the first vehicle operation parameters meet a first preset enabling condition, controlling the regenerated fuel injection quantity so that the SCR system carries out desulfurization regeneration treatment according to the total duration at a preset temperature, and recovering the catalytic performance of the SCR system. According to the method, the conversion efficiency of the SCR system to NOX is obtained in real time, the time of desulfurization and regeneration treatment of the SCR system is determined, the condition that the SCR system is incomplete in performance recovery due to the fact that the time of desulfurization and regeneration treatment is too short or the SCR system is unnecessarily parked for a long time due to the fact that the time of desulfurization and regeneration treatment is too long is avoided, and the conversion efficiency of the SCR system to NOX is ensured.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The apparatus and method embodiments described above are merely illustrative.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although the embodiments disclosed in the present application are described above, the descriptions are merely for facilitating understanding of the present application, and are not intended to limit the present application. Any person skilled in the art to which this application pertains will be able to make any modifications and variations in form and detail of implementation without departing from the spirit and scope of the disclosure, but the scope of the patent claims of this application shall be subject to the scope of the claims that follow.
Claims (10)
1. A method for recovering performance of an SCR system, the method comprising:
obtaining the conversion efficiency of the SCR system to nitrogen oxides;
determining target desulfurization regeneration times according to the conversion efficiency;
sending a parking regeneration request;
acquiring the average desulfurization regeneration time length and a first vehicle operation parameter in a parking state;
obtaining the total duration for executing the desulfurization regeneration treatment according to the target desulfurization regeneration times and the desulfurization regeneration average duration;
judging whether the first vehicle operation parameter meets a first preset enabling condition or not;
when the first vehicle operation parameters meet a first preset enabling condition, controlling the regenerated fuel injection quantity so that the SCR system carries out desulfurization regeneration treatment according to the total duration at a preset temperature, and recovering the catalytic performance of the SCR system.
2. The method of claim 1, wherein determining a target number of desulfurization regenerations based on the conversion efficiency comprises:
obtaining a desulfurization information corresponding table, wherein the desulfurization information corresponding table comprises a plurality of preset conversion efficiencies and preset desulfurization regeneration times corresponding to each preset conversion efficiency;
searching a preset conversion efficiency matched with the conversion efficiency in the desulfurization information corresponding table, and taking the preset desulfurization regeneration times corresponding to the preset conversion efficiency as target desulfurization regeneration times.
3. The method according to claim 2, wherein when the sulfur removal information correspondence table further includes fuel sulfur content corresponding to each of the preset conversion efficiencies, the method further comprises:
searching a preset conversion efficiency matched with the conversion efficiency in the desulfurization information corresponding table, and displaying the fuel sulfur content corresponding to the preset conversion efficiency on a vehicle instrument panel.
4. The method of claim 1, wherein determining whether the first vehicle operating parameter meets a first preset enabling condition when the first vehicle operating parameter includes vehicle speed, clutch operating state, throttle signal, park brake state, brake signal, SCR system operating state, engine operating state, and engine speed comprises:
judging whether the vehicle speed is 0, judging whether the clutch working state is a preset clutch working state, judging whether the accelerator signal is 0, judging whether the parking braking state is an on state, judging whether the brake signal is 0, judging whether the SCR system working state is a preset SCR system working state, judging whether the engine working state is a preset engine working state, and judging whether the engine rotating speed is in a first preset rotating speed range.
5. The method of claim 1, wherein controlling the regeneration injection quantity comprises:
and controlling the PID controller to adjust the regenerated fuel injection quantity according to the preset temperature, the real-time temperature of the front end of the diesel oxidation catalyst, the real-time temperature of the rear end of the diesel oxidation catalyst and a preset fuel injection quantity control algorithm so as to maintain the real-time temperature of the rear end of the diesel oxidation catalyst at the preset temperature within the total duration.
6. The method of claim 1, wherein prior to obtaining the conversion efficiency of the SCR system to nitrogen oxides, the method further comprises:
acquiring a second vehicle operation parameter in a vehicle operation state;
judging whether the second vehicle operation parameter meets a second preset enabling condition or not;
and executing the step of acquiring the conversion efficiency of the SCR system to the nitrogen oxides when the second vehicle operation parameter meets a second preset enabling condition.
7. The method of claim 6, wherein determining whether the second vehicle operating parameter meets a second preset enabling condition when the second vehicle operating parameter includes an engine operating state, an engine speed change rate, an engine torque change rate, an operating state of a urea injection device, a urea injection quantity, an operating state of a nitrogen oxide sensor, an operating state of a temperature sensor, comprises:
judging whether the engine working state is a preset engine working state, judging whether the engine rotating speed is in a second preset rotating speed range, judging whether the engine rotating speed change rate is in a preset rotating speed change rate range, judging whether the engine torque is in a preset torque range, judging whether the engine torque change rate is in a preset torque change rate range, judging whether the working state of the urea injection device is a preset urea device working state, judging whether the urea injection quantity is in a preset injection quantity range, judging whether the working state of the nitrogen oxide sensor is a first preset sensor working state, and judging whether the working state of the temperature sensor is a second preset sensor working state.
8. An SCR system performance restoration device, the device comprising:
the first acquisition module is used for acquiring the conversion efficiency of the SCR system to nitrogen oxides;
the determining module is used for determining target desulfurization regeneration times according to the conversion efficiency;
the sending module is used for sending a parking regeneration request;
the second acquisition module is used for acquiring the average desulfurization regeneration duration and the first vehicle operation parameters in the parking state;
the calculation module is used for obtaining the total duration for executing the desulfurization regeneration treatment according to the target desulfurization regeneration times and the desulfurization regeneration average duration;
the judging module is used for judging whether the first vehicle operation parameters meet a first preset enabling condition or not;
and the regeneration module is used for controlling the injection regeneration fuel injection quantity when the first vehicle operation parameter meets a first preset enabling condition so that the SCR system carries out desulfurization regeneration treatment according to the total duration at a preset temperature and the catalytic performance of the SCR system is recovered.
9. A storage medium storing a computer program which, when executed by one or more processors, implements the SCR system performance restoration method of any one of claims 1-7.
10. A vehicle, characterized by comprising:
an engine;
an exhaust manifold, an inlet end of the exhaust manifold being connected to the engine;
the front end of the diesel oxidation catalyst is connected with the outlet end of the exhaust manifold, the front end of the diesel oxidation catalyst is provided with a nitrogen oxide sensor, and the front end and the rear end of the diesel oxidation catalyst are both provided with temperature sensors;
the front end of the particle catcher is connected with the rear end of the diesel oxidation catalyst;
the front end of the SCR system is connected with the rear end of the particle catcher, the rear end of the SCR system is provided with a nitrogen oxide sensor, and the front end and the rear end of the SCR system are both provided with temperature sensors;
a processor, coupled to the engine, the temperature sensor, the nox sensor, for performing the SCR system performance recovery method of any one of claims 1-7.
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