CN115095411A - Detection method and device for removal of selective catalytic reduction carrier - Google Patents
Detection method and device for removal of selective catalytic reduction carrier Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 131
- 238000010531 catalytic reduction reaction Methods 0.000 title claims abstract description 41
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 180
- 230000004044 response Effects 0.000 claims abstract description 88
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000004202 carbamide Substances 0.000 claims abstract description 56
- 238000001914 filtration Methods 0.000 claims abstract description 46
- 238000002347 injection Methods 0.000 claims abstract description 29
- 239000007924 injection Substances 0.000 claims abstract description 29
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 25
- 239000000758 substrate Substances 0.000 claims description 8
- 230000010354 integration Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 16
- 239000003054 catalyst Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 231100000572 poisoning Toxicity 0.000 description 2
- 230000000607 poisoning effect Effects 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The application discloses a selective catalytic reduction carrier removal detection method and a device. The method comprises the following steps: injecting urea into a pipeline upstream of the Selective Catalytic Reduction (SCR) device in response to a urea injection signal; the urea injection signal carries a preset detection signal; acquiring a nitrogen oxide response signal in a pipeline at the downstream of the SCR device; filtering the nitrogen oxide response signal to obtain a filtered signal; the filtering processing is used for filtering out the signal component of a preset detection signal in the nitrogen oxide response signal; based on the NOx response signal and the filtered signal, it is detected whether an SCR carrier of the SCR device is removed. Therefore, whether the SCR carrier is removed or not can be effectively detected, and the reliability and the accuracy of detection are improved.
Description
Technical Field
The application relates to the technical field of automobile engineering, in particular to a selective catalytic reduction carrier removal detection method and device.
Background
The SCR (Selective Catalytic Reduction) technology is a tail gas treatment technology applied to a diesel engine after-treatment system, and can convert harmful nitrogen oxides in tail gas into harmless nitrogen by chemical reaction through a catalyst on an SCR carrier. However, the SCR carriers in the SCR device may be removed, resulting in exhaust pollutants exceeding the specified standards, causing environmental pollution.
In response to this problem, it is currently possible to detect whether the SCR carrier is removed by the SCR conversion efficiency. When the SCR conversion efficiency decreases, it is determined that the SCR carrier is removed. However, factors affecting the SCR conversion efficiency, such as sulfur poisoning of the catalyst on the SCR carrier and unstable engine operating conditions, all result in a decrease in the SCR conversion efficiency. Therefore, whether the SCR carrier in the SCR device is removed is detected based on the SCR conversion efficiency, reliability is low, and accuracy of the detection result is insufficient.
Disclosure of Invention
The embodiment of the application provides a selective catalytic reduction carrier removal detection method and device, and aims to solve the problems that an existing method for detecting whether an SCR carrier is removed is low in reliability and insufficient in accuracy of detection results.
In a first aspect, an embodiment of the present application provides a method for detecting removal of a selective catalytic reduction carrier, including:
injecting urea into a pipe upstream of the Selective Catalytic Reduction (SCR) device in response to a urea injection signal; the urea injection signal carries a preset detection signal;
acquiring a nitrogen oxide response signal in a pipeline downstream of the SCR device;
filtering the nitrogen oxide response signal to obtain a filtered signal; the filtering processing is used for filtering out the signal component of the preset detection signal in the nitrogen oxide response signal;
detecting whether an SCR substrate of the SCR device is removed based on the NOx response signal and the filtered signal.
Optionally, said detecting whether an SCR substrate of the SCR device is removed based on the nox response signal and the filtered signal comprises:
acquiring a signal difference between the nitrogen oxide response signal and the filtering signal;
integrating the signal difference to obtain an integral quantity;
detecting whether the SCR carrier is removed based on the integrated amount.
Optionally, the detecting whether the SCR carrier is removed based on the integrated amount includes:
when the integral quantity is greater than or equal to an integral quantity threshold value, obtaining a detection result indicating that the SCR carrier is removed;
and when the integral quantity is smaller than an integral quantity threshold value, obtaining a detection result indicating that the SCR carrier is not removed.
Optionally, after obtaining the detection result indicating that the SCR carrier is removed, the method further includes:
re-detecting whether an SCR carrier of the SCR device is removed based on the NOx response signal and the filtered signal;
and when the new detection result still indicates that the SCR carrier is removed, circularly detecting whether the SCR carrier of the SCR device is removed or not until the detection result indicates that the SCR carrier is not removed, or the quantity of the detection results indicating that the SCR carrier is removed is larger than or equal to a quantity threshold value.
Optionally, before injecting urea into the pipeline upstream of the SCR device, the method further comprises:
when the engine does not pass through the back-dragging working condition, the inlet temperature of the SCR device is increased to a preset temperature, and the time length of the inlet temperature at the preset temperature is controlled to last for a preset time length.
In a second aspect, embodiments of the present application provide a selective catalytic reduction carrier removal detection apparatus, including:
the urea injection module is used for responding to a urea injection signal and injecting urea to an upstream pipeline of the selective catalytic reduction SCR device; the urea injection signal carries a preset detection signal;
the signal acquisition module is used for acquiring a nitrogen oxide response signal in a pipeline downstream of the SCR device;
the filtering processing module is used for carrying out filtering processing on the nitrogen oxide response signal to obtain a filtering signal; the filtering processing is used for filtering out the signal component of the preset detection signal in the nitrogen oxide response signal;
a signal detection module to detect whether an SCR carrier of the SCR device is removed based on the NOx response signal and the filtered signal.
Optionally, the signal detection module includes:
a signal difference acquisition module for acquiring a signal difference between the nitrogen oxide response signal and the filtered signal;
the integration module is used for integrating the signal difference to obtain an integral quantity;
and the integral quantity detection module is used for detecting whether the SCR carrier is removed or not based on the integral quantity.
Optionally, the integral quantity detection module is specifically configured to:
when the integral quantity is larger than or equal to an integral quantity threshold value, obtaining a detection result indicating that the SCR carrier is removed;
and when the integral quantity is smaller than an integral quantity threshold value, obtaining a detection result indicating that the SCR carrier is not removed.
Optionally, the selective catalytic reduction carrier removal detection apparatus further comprises:
a re-detection module for re-detecting whether an SCR carrier of the SCR device is removed based on the NOx response signal and the filtered signal;
and the information reminding module is used for circularly detecting whether the SCR carrier of the SCR device is removed or not when the new detection result still indicates that the SCR carrier is removed until the detection result indicates that the SCR carrier is not removed, or the number of the detection results indicating that the SCR carrier is removed is greater than or equal to a number threshold value.
Optionally, the detection apparatus for selective catalytic reduction carrier removal further comprises:
and the SCR device control module is used for increasing the inlet temperature of the SCR device to a preset temperature when the engine is not in a back-dragging working condition and controlling the duration of the inlet temperature at the preset temperature to last for a preset duration.
According to the technical scheme, the embodiment of the application has the following advantages:
in the embodiment of the application, when urea is injected to an upstream pipeline of the selective catalytic reduction SCR device in response to a urea injection signal carrying a preset detection signal, a nitrogen oxide response signal can be obtained in a downstream pipeline of the SCR device, and the nitrogen oxide response signal is filtered to obtain a filtering signal, wherein the filtering processing is to filter a signal component of the preset detection signal in the nitrogen oxide response signal. It is then possible to detect whether the SCR substrate has been removed based on the nox response signal and the filtered signal. Since urea is injected into the pipeline upstream of the SCR device when the SCR carrier in the SCR device is not removed, the signal component of the preset detection signal in the nitrogen oxide response signal in the pipeline downstream can be weakened; when the SCR carrier is removed, the urea is sprayed into an upstream pipeline of the SCR device, and the signal component of a preset detection signal in a nitrogen oxide response signal in a downstream pipeline cannot be weakened, so that whether the SCR carrier is removed or not can be effectively detected according to the nitrogen oxide response signal and a filtering signal related to the signal component, and the reliability and the accuracy of detection are improved.
Drawings
FIG. 1 is a flow chart of a method for detecting Selective Catalytic Reduction (SCR) carrier removal provided in an embodiment of the present application;
FIG. 2 is a flow chart of another method for detecting selective catalytic reduction support removal provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a selective catalytic reduction carrier removal detection apparatus according to an embodiment of the present application.
Detailed Description
As described hereinbefore, the inventors found in the study on the SCR carrier that: it is currently possible to detect whether the SCR carrier is removed by the SCR conversion efficiency. When the SCR conversion efficiency decreases, it is determined that the SCR carrier is removed. However, the conversion efficiency of SCR is decreased by a large number of factors, such as sulfur poisoning of the catalyst on the SCR carrier and unstable engine operating conditions. Therefore, whether the SCR carrier in the SCR device is removed is detected based on the SCR conversion efficiency, reliability is low, and accuracy of the detection result is insufficient.
In order to solve the above problem, an embodiment of the present application provides a method for detecting removal of a selective catalytic reduction carrier, the method including: when urea is injected into an upstream pipeline of the selective catalytic reduction SCR device in response to the urea injection signal, a nitrogen oxide response signal can be obtained from a downstream pipeline of the SCR device, and the nitrogen oxide response signal is filtered to obtain a filtering signal, wherein the filtering process is used for filtering a signal component of a preset detection signal in the nitrogen oxide response signal. It is then possible to detect whether the SCR substrate has been removed based on the nox response signal and the filtered signal.
Since urea is injected into the pipeline upstream of the SCR device when the SCR carrier in the SCR device is not removed, the signal component of the preset detection signal in the nitrogen oxide response signal in the pipeline downstream can be weakened; when the SCR carrier is removed, the urea is sprayed into an upstream pipeline of the SCR device, and the signal component of a preset detection signal in a nitrogen oxide response signal in a downstream pipeline cannot be weakened, so that whether the SCR carrier is removed or not can be effectively detected according to the nitrogen oxide response signal and a filtering signal related to the signal component, and the reliability and the accuracy of detection are improved.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Fig. 1 is a flowchart of a detection method for selective catalytic reduction carrier removal according to an embodiment of the present disclosure. Referring to fig. 1, a method for detecting removal of a selective catalytic reduction carrier provided in an embodiment of the present application may include:
s101: urea is injected into a conduit upstream of the selective catalytic reduction SCR device in response to a urea injection signal.
The urea injection signal may carry a predetermined detection signal, such as a square wave signal with frequency f and amplitude a. It is understood that the SCR technology is a technology for purifying nitrogen oxides in diesel engine emissions by optimizing and then injecting and cylinder structures to suppress the generation of particulate pollutants in a cylinder, and then injecting urea of a certain concentration into an upstream pipeline to generate NH after hydrolysis at a high temperature 3 Can be preferentially selected to perform reduction reaction with nitrogen oxides in tail gas to generate N under the action of a catalyst on an SCR carrier 2 And water, so that harmful nitrogen oxides are converted into harmless nitrogen, and the control on the pollutant emission of the diesel engine is finished. Therefore, in the case where urea is injected into the upstream line of the SCR device with a certain time delay, a nox sensor of the downstream line may obtain a nox response signal as a chemical reaction between urea and nox. Based on this, after applying a preset detection signal to the urea injection signal, urea may be injected to the upstream line of the SCR device in response to the urea injection signal. After a certain time delay, a nox response signal can be obtained from the line downstream of the SCR device and carries a signal component of the predetermined detection signal.
In addition, as for the determination method of the urea injection amount corresponding to the urea injection to the upstream pipeline of the SCR device, the embodiment of the present application may not be specifically limited, for example, the urea injection amount may be determined based on a preset vacuum ratio and a preset injection period of the urea nozzle, or may be determined based on the operation condition of the aftertreatment system.
S102: a NOx response signal is obtained in a conduit downstream of the SCR device.
Based on the above analysis, the nox response signal carries a signal component of the predetermined detection signal.
S103: and filtering the nitrogen oxide response signal to obtain a filtered signal.
The filtering process may be used to filter out a signal component of a predetermined detection signal in the nox response signal. When the SCR carrier in the SCR device is not removed, the SCR device is equivalent to a first-order time delay system, urea is injected into a pipeline at the upstream of the SCR device, and the signal component of a preset detection signal in a nitrogen oxide response signal in the pipeline at the downstream can be weakened after a certain time delay. When the SCR carrier is removed, the first-order time delay system does not exist, and urea is sprayed into an upstream pipeline of the SCR device at the moment, so that the signal component of a preset detection signal in a nitrogen oxide response signal in the downstream pipeline can be found not to be weakened. Therefore, whether the signal component is weakened or not can be judged based on the unprocessed nitrogen oxide response signal and the filtered signal obtained after the filtering processing, so that whether the SCR carrier is removed or not can be detected.
S104: based on the NOx response signal and the filtered signal, it is detected whether an SCR carrier of the SCR device is removed.
For the implementation of detecting whether the SCR carrier is removed, the embodiment of the present application is not particularly limited, and for convenience of understanding, the following description is made in conjunction with one possible implementation.
As a possible implementation manner, S104 may specifically include: acquiring a signal difference between the nitrogen oxide response signal and the filtering signal; integrating the signal difference to obtain an integral quantity; whether the SCR carrier is removed is detected based on the integrated amount. The integral quantity corresponding to the signal difference between the nitrogen oxide response signal and the filtering signal is larger, so that the signal component of the filtered preset detection signal is more, namely, after urea is injected into an upstream pipeline of the SCR device, the signal component of the preset detection signal in the nitrogen oxide response signal in the downstream pipeline is not weakened, and the SCR carrier is removed. Correspondingly, the smaller the integral quantity corresponding to the signal difference between the nitrogen oxide response signal and the filter signal, the smaller the signal component of the filtered preset detection signal, that is, after urea is injected into the pipeline upstream of the SCR device, the signal component of the preset detection signal in the nitrogen oxide response signal in the pipeline downstream is weakened, and therefore, the SCR carrier is not removed. Therefore, whether the signal component in the preset detection signal is weaker can be judged through the integral quantity corresponding to the signal difference between the nitrogen oxide response signal and the filtering signal, and whether the SCR carrier is removed can be accurately detected.
Correspondingly, detecting whether the SCR carrier is removed based on the integral quantity may specifically include: when the integral quantity is greater than or equal to the integral quantity threshold value, obtaining a detection result indicating that the SCR carrier is removed; when the integral quantity is smaller than the integral quantity threshold value, a detection result indicating that the SCR carrier is not removed is obtained.
In addition, after the detection result indicating that the SCR carrier is removed is obtained, the embodiment of the present application may further improve the accuracy of the detection result by means of cycle detection. Specifically, after obtaining the detection result indicating that the SCR carrier is removed, the detection method for selective catalytic reduction carrier removal may further include: redetecting whether an SCR substrate of the SCR device is removed based on the NOx response signal and the filtered signal; and when the new detection result still indicates that the SCR carrier is removed, circularly detecting whether the SCR carrier of the SCR device is removed or not until the detection result indicates that the SCR carrier is not removed, or the quantity of the detection results indicating that the SCR carrier is removed is larger than or equal to a quantity threshold value. It is to be understood that in the loop detection mode, if the number of detection results indicating that the SCR carrier is removed is greater than or equal to the number threshold, it may be determined that the SCR carrier is removed, and thus the warning may be issued directly. If the detection result indicating that the SCR carrier is not removed exists, the removal judgment process of the SCR carrier can be misjudged, and the detection can be stopped. In addition, the embodiment of the present application may send out the failure prompt through various implementation manners, which are described below by way of example.
As an example, if the detection result indicating that the SCR carrier is removed can be uploaded to the cloud server, the cloud server may issue a fault alert by sending a message. For example, the cloud server may be in communication connection with a terminal device associated with the vehicle, so as to send the detection result indicating that the SCR carrier is removed and/or the fault reminding message to a vehicle inspector. In addition, the terminal device is, for example, a mobile device, a computer, or the like, or any combination thereof. In some embodiments, the mobile device may include a cell phone, a wearable device, a tablet, a virtual reality device, or the like, or any combination thereof.
As another example, if the vehicle is equipped with an information alert device, a fault alert may be issued by the information alert device. For example, the information reminding device may be an on-board display screen, and the fault reminding is sent out by displaying the detection result indicating that the SCR carrier is removed and/or the fault reminding information through the on-board display screen. Or the information reminding device can be a sound generating device, and fault reminding is sent out in a mode that the sound generating device sends out a reminding sound. The prompt tone may be a preset ringing sound effect, or may be a voice broadcast of the detection result indicating that the SCR carrier is removed and/or the fault prompt information.
In addition, the SCR conversion efficiency can be calculated in the embodiment of the application; and when the SCR conversion efficiency is greater than or equal to the efficiency threshold value, applying a preset detection signal to the urea injection signal. Therefore, the condition for carrying out the detection logic for removing the SCR carrier is set by combining the SCR conversion efficiency, so that the accuracy of the detection result is further improved, the detection for removing the SCR carrier is not required to be carried out in real time, and the detection efficiency is improved.
Based on the above related contents of S101-S104, in the embodiment of the present application, since urea is injected into the pipeline upstream of the SCR device when the SCR carrier in the SCR device is not removed, the signal component of the predetermined detection signal in the NOx response signal in the pipeline downstream is weakened; when the SCR carrier is removed, the urea is sprayed into an upstream pipeline of the SCR device, and the signal component of a preset detection signal in the nitrogen oxide response signal in the downstream pipeline is not weakened, so that whether the SCR carrier is removed or not can be effectively detected according to the nitrogen oxide response signal and the filtering signal related to the signal component, and the reliability and the accuracy of detection are improved.
In order to more accurately detect whether the SCR carrier is removed, the embodiment of the application can obtain a more accurate nitrogen oxide response signal from a pipeline downstream of the SCR device in a mode of increasing the discharge amount of nitrogen oxide, so that the SCR carrier can be effectively detected whether the SCR carrier is removed. In response, the present application may also provide another method of detecting selective catalytic reduction support removal. The following describes the detection method of selective catalytic reduction carrier removal with reference to examples and drawings, respectively.
FIG. 2 is a flow chart of another method for detecting selective catalytic reduction carrier removal provided in embodiments of the present application. Referring to fig. 2, a method for detecting removal of a selective catalytic reduction carrier provided in an embodiment of the present application may include:
s201: when the engine does not pass through the back-dragging working condition, the inlet temperature of the SCR device is increased to a preset temperature, and the duration of the inlet temperature at the preset temperature is controlled to last for a preset duration.
The back-dragging working condition refers to a working condition that the engine of the vehicle does not have power demand when running to a downhill, sliding and other road conditions. When the engine enters a drag-down working condition, the engine does not inject oil, and the SCR device does not inject urea, so that the temperature of the SCR carrier is greatly reduced by air passing through the SCR device. When the engine is operated by injecting oil again, the SCR carrier temperature is reduced, the SCR conversion efficiency is reduced, and the emission amount of nitrogen oxides is increased. And when the engine is not in a dragging-down working condition, in order to improve the discharge amount of nitrogen oxides, the inlet temperature of the SCR device can be increased to a preset temperature, the duration that the inlet temperature is at the preset temperature is controlled to be continuous for a preset duration, and in the process, due to the influence of high temperature, NH adsorbed by active sites of a catalyst on the SCR carrier 3 Slip begins, and thus, the SCR conversion efficiency decreases and the amount of nitrogen oxide emissions increases.
S202: injecting urea into a pipe upstream of the Selective Catalytic Reduction (SCR) device in response to a urea injection signal; the urea injection signal carries a predetermined detection signal.
S203: a NOx response signal is obtained in a conduit downstream of the SCR device.
S204: filtering the nitrogen oxide response signal to obtain a filtered signal; and the filtering processing is used for filtering out the signal component of the preset detection signal in the nitrogen oxide response signal.
S205: based on the NOx response signal and the filtered signal, it is detected whether an SCR carrier of the SCR device is removed.
From the above description, it can be known that the detection method for selective catalytic reduction carrier removal according to the embodiments of the present application obtains a more accurate nitrogen oxide response signal from a pipeline downstream of an SCR device by increasing the emission amount of nitrogen oxide, thereby facilitating to effectively detect whether the SCR carrier is removed.
Based on the detection method for removing the selective catalytic reduction carrier provided by the embodiment, the embodiment of the application also provides a detection device for removing the selective catalytic reduction carrier. The following describes the detecting device for selective catalytic reduction carrier removal with reference to the examples and the accompanying drawings, respectively.
Fig. 3 is a schematic structural diagram of a selective catalytic reduction carrier removal detection apparatus according to an embodiment of the present application. Referring to fig. 3, the selective catalytic reduction carrier removal detection apparatus 300 provided in the embodiment of the present application may include:
a urea injection module 301 for injecting urea into an upstream pipe of the SCR device in response to a urea injection signal; the urea injection signal carries a preset detection signal;
a signal acquisition module 302 for acquiring a nitrogen oxide response signal in a pipeline downstream of the SCR device;
the filtering processing module 303 is configured to perform filtering processing on the nitrogen oxide response signal to obtain a filtered signal; the filtering processing is used for filtering out the signal component of a preset detection signal in the nitrogen oxide response signal;
a signal detection module 304 for detecting whether the SCR carrier of the SCR device is removed based on the NOx response signal and the filtered signal.
In the embodiment of the application, through the cooperation of the urea injection module 301, the signal acquisition module 302, the filtering processing module 303 and the signal detection module 304, whether the SCR carrier is removed or not can be effectively detected according to the nox response signal and the filtering signal related to the signal component, so that the reliability and the accuracy of the detection are improved.
As an embodiment, in order to effectively detect whether the SCR carrier is removed, and improve the reliability and accuracy of the detection, the signal detection module 304 may include:
the signal difference acquisition module is used for acquiring the signal difference between the nitrogen oxide response signal and the filtering signal;
the integration module is used for integrating the signal difference to obtain an integral quantity;
and the integral quantity detection module is used for detecting whether the SCR carrier is removed or not based on the integral quantity.
As an embodiment, in order to effectively detect whether the SCR carrier is removed and improve the reliability and accuracy of the detection, the integral amount detection module may be specifically configured to:
when the integral quantity is greater than or equal to the integral quantity threshold value, obtaining a detection result indicating that the SCR carrier is removed;
when the integral quantity is smaller than the integral quantity threshold value, a detection result indicating that the SCR carrier is not removed is obtained.
As an embodiment, in order to effectively detect whether the SCR carrier is removed and improve the reliability and accuracy of the detection, the device 300 for detecting the removal of the selective catalytic reduction carrier may further include:
a re-detection module for re-detecting whether the SCR carrier of the SCR device is removed based on the NOx response signal and the filtered signal;
and the information reminding module is used for circularly detecting whether the SCR carrier of the SCR device is removed or not when the new detection result still indicates that the SCR carrier is removed until the detection result indicates that the SCR carrier is not removed, or the number of the detection results indicating that the SCR carrier is removed is greater than or equal to a number threshold value.
As an embodiment, in order to effectively detect whether the SCR carrier is removed or not and improve the reliability and accuracy of the detection, the detection apparatus 300 for removing a selective catalytic reduction carrier may further include:
and the SCR device control module is used for increasing the inlet temperature of the SCR device to a preset temperature when the engine is not in a back-dragging working condition and controlling the duration of the inlet temperature at the preset temperature to last for a preset duration.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A method for detecting removal of a selective catalytic reduction support, comprising:
injecting urea into a pipeline upstream of the Selective Catalytic Reduction (SCR) device in response to a urea injection signal; the urea injection signal carries a preset detection signal;
acquiring a nitrogen oxide response signal in a pipeline downstream of the SCR device;
filtering the nitrogen oxide response signal to obtain a filtered signal; the filtering processing is used for filtering out the signal component of the preset detection signal in the nitrogen oxide response signal;
detecting whether an SCR substrate of the SCR device is removed based on the NOx response signal and the filtered signal.
2. The method of claim 1, wherein detecting whether an SCR substrate of the SCR device is removed based on the nox response signal and the filtered signal comprises:
acquiring a signal difference between the nitrogen oxide response signal and the filtering signal;
integrating the signal difference to obtain an integral quantity;
detecting whether the SCR carrier is removed based on the integrated amount.
3. The method according to claim 2, wherein the detecting whether the SCR carrier is removed based on the integrated amount includes:
when the integral quantity is larger than or equal to an integral quantity threshold value, obtaining a detection result indicating that the SCR carrier is removed;
and when the integral quantity is smaller than an integral quantity threshold value, obtaining a detection result indicating that the SCR carrier is not removed.
4. The method of claim 3, wherein after obtaining the detection result indicating that the SCR carrier is removed, the method further comprises:
re-detecting whether an SCR substrate of the SCR device is removed based on the NOx response signal and the filtered signal;
and when the new detection result still indicates that the SCR carrier is removed, circularly detecting whether the SCR carrier of the SCR device is removed or not until the detection result indicates that the SCR carrier is not removed, or the quantity of the detection results indicating that the SCR carrier is removed is larger than or equal to a quantity threshold value.
5. The method of any one of claims 1 to 4, wherein prior to injecting urea into a conduit upstream of a Selective Catalytic Reduction (SCR) device, the method further comprises:
when the engine does not pass through the back-dragging working condition, the inlet temperature of the SCR device is increased to a preset temperature, and the time length of the inlet temperature at the preset temperature is controlled to last for a preset time length.
6. A selective catalytic reduction support removal detection device, comprising:
the urea injection module is used for responding to a urea injection signal and injecting urea to an upstream pipeline of the selective catalytic reduction SCR device; the urea injection signal carries a preset detection signal;
the signal acquisition module is used for acquiring a nitrogen oxide response signal in a pipeline downstream of the SCR device;
the filtering processing module is used for carrying out filtering processing on the nitrogen oxide response signal to obtain a filtering signal; the filtering processing is used for filtering out the signal component of the preset detection signal in the nitrogen oxide response signal;
a signal detection module to detect whether an SCR carrier of the SCR device is removed based on the NOx response signal and the filtered signal.
7. The apparatus of claim 6, wherein the signal detection module comprises:
the signal difference acquisition module is used for acquiring the signal difference between the nitrogen oxide response signal and the filtering signal;
the integration module is used for integrating the signal difference to obtain an integral quantity;
and the integral quantity detection module is used for detecting whether the SCR carrier is removed or not based on the integral quantity.
8. The apparatus of claim 7, wherein the integral quantity detection module is specifically configured to:
when the integral quantity is larger than or equal to an integral quantity threshold value, obtaining a detection result indicating that the SCR carrier is removed;
and when the integral quantity is smaller than an integral quantity threshold value, obtaining a detection result indicating that the SCR carrier is not removed.
9. The apparatus of claim 8, further comprising:
a re-detection module for re-detecting whether an SCR carrier of the SCR device is removed based on the NOx response signal and the filtered signal;
and the information reminding module is used for circularly detecting whether the SCR carrier of the SCR device is removed or not when the new detection result still indicates that the SCR carrier is removed until the detection result indicates that the SCR carrier is not removed, or the number of the detection results indicating that the SCR carrier is removed is greater than or equal to a number threshold value.
10. The apparatus of any one of claims 6 to 9, further comprising:
and the SCR device control module is used for increasing the inlet temperature of the SCR device to a preset temperature when the engine is not in a towing working condition, and controlling the duration of the inlet temperature at the preset temperature to be continuous for a preset duration.
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