CN113653555B - Method and device for removing crystals in SCR carrier box - Google Patents
Method and device for removing crystals in SCR carrier box Download PDFInfo
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- CN113653555B CN113653555B CN202111031180.6A CN202111031180A CN113653555B CN 113653555 B CN113653555 B CN 113653555B CN 202111031180 A CN202111031180 A CN 202111031180A CN 113653555 B CN113653555 B CN 113653555B
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- control temperature
- regeneration control
- regeneration
- carrier box
- scr carrier
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The invention belongs to the technical field of engine post-treatment, and discloses a method and a device for removing crystals of an SCR carrier box. The state of the SCR carrier box is judged by monitoring data reflecting the catalytic reduction effect of the SCR carrier box, when the SCR carrier box is in a preset working condition, the whole vehicle is controlled to carry out self-adaptive regeneration operation in time, the regeneration control temperature is increased on the basis of the previous regeneration control temperature to obtain the current expected regeneration control temperature, the whole vehicle is controlled to carry out regeneration operation at the current expected regeneration control temperature, and therefore the removal effect of the regeneration operation on crystals is improved. And recording the expected regeneration control temperature as the current regeneration control temperature, and leaving reference data for the subsequent regeneration operation of the SCR carrier box.
Description
Technical Field
The invention relates to the technical field of engine post-treatment, in particular to a method and a device for removing crystals of an SCR carrier box.
Background
Modern diesel locomotives adopt SCR selective catalytic reduction technology to treat tail gas, the tail gas reacts with urea sprayed by a urea pump on an SCR carrier box, reducing substances in the urea and nitrogen oxides in the tail gas are subjected to oxidation-reduction reaction under the catalytic action of a catalyst on an SCR carrier, and the tail gas is reduced into harmless gas and discharged into the atmosphere.
Because the operating condition of the engine changes greatly, urea has certain deviation in injection amount control, the proportion of reaction substances of the urea and the urea is not accurate, and redundant urea can form a layer of crystals on an SCR carrier after being cooled. Normally, the crystals will volatilize at high temperatures, but when combined with impurities in the tail gas, the crystals will need to reach temperatures as high as 600 degrees before they can be removed. Therefore, along with the increase of the driving mileage of the whole vehicle, crystals accumulated on the SCR carrier are more and more, so that the conversion efficiency of the SCR carrier box is reduced, and the tail gas treatment effect is influenced. When the whole vehicle is seriously crystallized, regeneration operation is required, and the high temperature generated by the regeneration operation burns off the crystals on the SCR carrier.
However, the existing method for removing the crystals of the SCR carrier box cannot control the whole vehicle to perform regeneration operation in time and has poor crystal removal effect.
Disclosure of Invention
The invention aims to provide a method and a device for removing SCR carrier box crystals, which realize the complete removal of the SCR carrier box crystals by regeneration operation.
In order to achieve the purpose, the invention adopts the following technical scheme:
an SCR carrier box crystallization removal method comprises the following steps:
monitoring data which embody the catalytic reduction effect of the SCR carrier box;
and if the SCR carrier box is judged to be in the preset working condition according to the monitoring data, controlling the whole vehicle to carry out self-adaptive regeneration operation, wherein the step of controlling the whole vehicle to carry out self-adaptive regeneration operation comprises the steps of determining the expected regeneration control temperature at this time, controlling the whole vehicle to carry out regeneration operation at the expected regeneration control temperature at this time, and recording the expected regeneration control temperature at this time as the regeneration control temperature at this time, wherein the expected regeneration control temperature at this time is the latest regeneration control temperature plus a preset temperature adjustment quantity.
Preferably, the monitoring data is an average conversion efficiency of the SCR carrier box per driving cycle.
Preferably, the preset working conditions are as follows:
the average conversion efficiency over a plurality of driving cycles gradually decreases, and the average conversion efficiency over the last driving cycle is lower than the first set value.
Preferably, the plurality of driving cycles is 3 driving cycles or more.
Preferably, after the engine regeneration operation, if the catalytic reduction effect of the SCR carrier box does not meet the adaptive exit condition, the whole vehicle is controlled again to perform the adaptive regeneration operation.
Preferably, the adaptive exit condition is:
the average conversion efficiency for the first drive cycle after completion of the regeneration operation is higher than the second set point.
Preferably, after the current expected regeneration control temperature is determined, the method further includes comparing the current expected regeneration control temperature with the maximum regeneration control temperature of the engine, and if the current expected regeneration control temperature is greater than the maximum regeneration control temperature of the engine, controlling the whole vehicle to perform regeneration operation by using the maximum regeneration control temperature of the engine, and recording the maximum regeneration control temperature of the engine as the current regeneration control temperature.
Preferably, if the engine meets the regeneration boundary condition and is not in the preset working condition, the whole vehicle is controlled to perform regeneration operation by adopting the standard regeneration control temperature, and the standard regeneration control temperature is recorded as the current regeneration control temperature.
Preferably, the regeneration boundary condition is that the running mileage of the whole vehicle reaches a set value and/or the accumulated carbon capacity of the whole vehicle reaches a preset value.
An engine aftertreatment crystal removal device for removing engine aftertreatment crystals by using the SCR carrier box crystal removal method.
The invention has the beneficial effects that:
according to the method for removing the crystal of the SCR carrier box, provided by the invention, the state of the SCR carrier box is judged by monitoring the monitoring data reflecting the catalytic reduction effect of the SCR carrier box, when the SCR carrier box is in a preset working condition, the whole vehicle is controlled to carry out self-adaptive regeneration operation in time, the regeneration control temperature is increased on the basis of the previous regeneration control temperature to obtain the current expected regeneration control temperature, and the whole vehicle is controlled to carry out regeneration operation at the current expected regeneration control temperature, so that the crystal removal effect of the regeneration operation is improved. And recording the expected regeneration control temperature as the current regeneration control temperature, and leaving reference data for the subsequent regeneration operation of the SCR carrier box.
Drawings
FIG. 1 is a flow chart of a method for removing crystals from an SCR carrier box according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The embodiment provides a method for removing crystals from an SCR carrier box, as shown in fig. 1, including: monitoring data representing the catalytic reduction effect of the SCR carrier box. Specifically, the catalytic reduction effect of the SCR carrier box is monitored through a monitoring device, monitoring data are recorded through a storage device, and the monitoring data are judged through a regeneration control unit. The monitoring data may be the conversion efficiency of the SCR carrier box or the average conversion efficiency of the SCR carrier box in each driving cycle, and in this embodiment, the monitoring data is preferably the average conversion efficiency of the SCR carrier box in each driving cycle. The average conversion efficiency of the SCR carrier box in one driving cycle is used as the basis for judging the catalytic reduction effect, so that the interference of the conversion efficiency fluctuation caused by sensor errors on monitoring data can be avoided, and the catalytic reduction effect of the SCR carrier box can be reflected more truly. In the present embodiment, the regeneration control unit is an in-vehicle ECU of the vehicle.
As shown in FIG. 1, during the operation of the engine, whether the SCR carrier box is in a preset working condition is judged according to the monitoring data. The preset working condition is that the average conversion efficiency of a plurality of driving cycles is gradually reduced, and the average conversion efficiency of the latest driving cycle is lower than a first set value. The SCR carrier box gradually reduces the average conversion efficiency of a plurality of driving cycles, which means that the reduction of the average conversion efficiency is caused by the accumulation of crystals, and the judgment of the regeneration control unit is prevented from being interfered by the sudden reduction of the conversion efficiency of a certain driving cycle caused by hardware damage and the like in an aftertreatment system. And the average conversion efficiency of a recent driving cycle is lower than the first set value, which indicates that the crystallization on the SCR carrier box seriously influences the catalytic reduction process of the tail gas, and the standard regeneration operation is difficult to completely remove the crystallization. The plurality of driving cycles referred to herein is 3 driving cycles or more.
And if the engine meets the boundary regeneration boundary condition, judging that the SCR carrier box is not in a preset working condition according to the monitoring data, controlling the whole vehicle to carry out regeneration operation by adopting the standard regeneration control temperature, and recording the standard regeneration control temperature as the current regeneration control temperature. The SCR carrier box is not in the preset working condition, which indicates that the crystallization on the SCR carrier box is not particularly serious, and the standard regeneration operation can completely remove the crystallization. Wherein the standard regeneration control temperature is 600 ℃. The regeneration boundary condition is that the running mileage of the whole vehicle reaches a set value and/or the accumulated carbon capacity of the whole vehicle reaches a preset value. Preferably, the regeneration boundary condition in this embodiment is that one of the running mileage of the entire vehicle reaches a set value and the accumulated carbon capacity of the entire vehicle reaches a set value, so as to ensure that the regeneration operation can be performed in time to remove crystals on the SCR carrier.
And if the SCR carrier box is judged to be in the preset working condition according to the monitoring data, controlling the whole vehicle to perform self-adaptive regeneration operation, wherein the step of controlling the whole vehicle to perform self-adaptive regeneration operation comprises the steps of determining the expected regeneration control temperature at the time, controlling the whole vehicle to perform regeneration operation at the expected regeneration control temperature at the time, and recording the expected regeneration control temperature at the time as the regeneration control temperature at the time, wherein the expected regeneration control temperature at the time is the latest regeneration control temperature plus the preset temperature adjustment amount. And the self-adaptive regeneration operation improves the crystal removal effect of the regeneration operation by improving the regeneration control temperature of the regeneration operation. The preset temperature adjustment amount can be set as required, and is generally preferably between 10 ℃ and 30 ℃, and in this embodiment, the preset temperature adjustment amount is preferably 20 ℃.
As shown in fig. 1, after the engine regeneration operation, if the catalytic reduction effect of the SCR carrier box does not satisfy the adaptive exit condition, the entire vehicle is controlled again to perform the adaptive regeneration operation. The adaptive exit condition is that the average conversion efficiency of the first driving cycle after completion of the regeneration operation is higher than the second set point. The method comprises the steps of judging the crystal removal effect of the regeneration operation after the regeneration operation by monitoring the working condition of an SCR carrier box after the regeneration operation, when the catalytic reduction effect of the SCR carrier box does not meet an adaptive exit condition, indicating that crystals are not completely removed, controlling the whole vehicle to carry out the adaptive regeneration operation again at the moment, increasing the regeneration temperature again, further increasing the crystal removal effect until the average conversion efficiency of a first driving cycle after the regeneration operation is finished is higher than a second set value, namely, the crystals are considered to be completely removed, wherein the second set value is the design conversion efficiency of the SCR carrier box in the embodiment.
As shown in fig. 1, after determining the current expected regeneration control temperature, the method further includes comparing the current expected regeneration control temperature with the maximum regeneration control temperature of the engine, and if the current expected regeneration control temperature is greater than the maximum regeneration control temperature of the engine, controlling the entire vehicle to perform a regeneration operation using the maximum regeneration control temperature of the engine, and recording the maximum regeneration control temperature of the engine as the current regeneration control temperature. That is, when the regeneration control temperature reaches the maximum regeneration control temperature of the engine, the regeneration control temperature is not further increased, thereby preventing damage to the equipment due to an excessively high regeneration control temperature. And if the average conversion efficiency of the first driving cycle after the regeneration operation is finished is still not higher than the second set value after the three times of regeneration operation are continuously carried out at the highest regeneration control temperature of the engine, the regeneration operation cannot realize the crystal removal, and at the moment, the self-adaptive regeneration operation is quitted and an SCR carrier box fault alarm is sent.
The embodiment also provides an engine post-treatment crystallization removal device which comprises a monitoring device, a storage device and a regeneration control unit, wherein the monitoring device is used for monitoring the catalytic reduction effect of the SCR carrier box, the storage device is used for recording monitoring data and regeneration control temperature of each regeneration operation, the regeneration control unit is used for judging the monitoring data, and the SCR carrier box crystallization removal method is used for removing crystals on the engine post-treatment SCR carrier. The state of the SCR carrier box is judged by monitoring data reflecting the catalytic reduction effect of the SCR carrier box, when the SCR carrier box is in a preset working condition, the whole vehicle is controlled to carry out self-adaptive regeneration operation in time, the regeneration control temperature is increased on the basis of the previous regeneration control temperature to obtain the current expected regeneration control temperature, the whole vehicle is controlled to carry out regeneration operation at the current expected regeneration control temperature, the removal effect of the regeneration operation on crystals is improved, the current expected regeneration control temperature is recorded as the current regeneration control temperature, and reference data are left for the subsequent regeneration operation of the SCR carrier box.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. An SCR carrier box crystallization removal method is characterized by comprising the following steps:
monitoring data which embody the catalytic reduction effect of the SCR carrier box;
if the SCR carrier box is judged to be in the preset working condition according to the monitoring data, controlling the whole vehicle to carry out self-adaptive regeneration operation, wherein the step of controlling the whole vehicle to carry out self-adaptive regeneration operation comprises the steps of determining the expected regeneration control temperature at the time, controlling the whole vehicle to carry out regeneration operation at the expected regeneration control temperature at the time, and recording the expected regeneration control temperature at the time as the current regeneration control temperature, wherein the expected regeneration control temperature at the time is the latest regeneration control temperature plus a preset temperature adjustment quantity;
the preset working conditions are as follows: the average conversion efficiency of a plurality of driving cycles gradually decreases, and the average conversion efficiency of the latest driving cycle is lower than a first set value;
after the engine is subjected to regeneration operation, if the catalytic reduction effect of the SCR carrier box does not meet the self-adaptive exit condition, controlling the whole vehicle to perform self-adaptive regeneration operation again;
the self-adaptive exit condition is as follows:
the average conversion efficiency of the first driving cycle after completion of the regeneration event is higher than the second set point.
2. The SCR carrier box crystal removal method of claim 1, wherein the monitoring data is an average conversion efficiency of the SCR carrier box over each driving cycle.
3. The SCR carrier box crystal removal method of claim 1, wherein the plurality of driving cycles is 3 driving cycles or more.
4. The SCR carrier box crystal removal method of claim 1, further comprising, after determining the current expected regeneration control temperature, comparing the current expected regeneration control temperature with a maximum engine regeneration control temperature, and if the current expected regeneration control temperature is greater than the maximum engine regeneration control temperature, controlling the entire vehicle to perform a regeneration operation using the maximum engine regeneration control temperature, and recording the maximum engine regeneration control temperature as the current regeneration control temperature.
5. The SCR carrier box crystal removal method of claim 1, wherein if the engine meets regeneration boundary conditions and is not in the preset working condition, controlling the whole vehicle to perform regeneration operation by adopting a standard regeneration control temperature, and recording the standard regeneration control temperature as the current regeneration control temperature.
6. The SCR carrier box crystal removal method of claim 5, wherein the regeneration boundary condition is that a vehicle mileage reaches a set value and/or a vehicle cumulative carbon loading reaches a preset value.
7. An engine aftertreatment crystal removal device, characterized in that engine aftertreatment crystals are removed by using the SCR carrier box crystal removal method of any one of claims 1 to 6.
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| CN202111031180.6A CN113653555B (en) | 2021-09-03 | 2021-09-03 | Method and device for removing crystals in SCR carrier box |
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| CN202111031180.6A CN113653555B (en) | 2021-09-03 | 2021-09-03 | Method and device for removing crystals in SCR carrier box |
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| CN113653555B true CN113653555B (en) | 2023-03-21 |
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| CN114718703A (en) * | 2022-04-14 | 2022-07-08 | 山东科技职业学院 | Aftertreatment heating device and control strategy of hybrid electric vehicle |
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| CN105240097B (en) * | 2015-10-27 | 2018-07-03 | 潍柴动力股份有限公司 | Dpf regeneration temprature control method and device |
| FR3054598B1 (en) * | 2016-08-01 | 2018-07-13 | Renault S.A.S | METHOD FOR CONTROLLING THE QUANTITY OF UREA CRYSTALS PRESENT IN AN EXHAUST LINE OF AN INTERNAL COMBUSTION ENGINE COMPRISING AN SCR CATALYST |
| DE112017004094T5 (en) * | 2016-08-15 | 2019-05-02 | Cummins Emission Solutions Inc. | System for the adaptive regeneration of aftertreatment system components |
| CN111828136B (en) * | 2019-04-17 | 2021-09-14 | 北京福田康明斯发动机有限公司 | System and method for eliminating crystallization of selective catalytic reduction system |
| CN110761881B (en) * | 2019-09-20 | 2021-01-08 | 东风商用车有限公司 | SCR efficiency diagnosis method |
| CN112282906B (en) * | 2020-10-30 | 2021-12-07 | 东风商用车有限公司 | SCR catalyst crystallization detection method, detection device and removal device |
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