CN115095411B - Detection method and device for removing selective catalytic reduction carrier - Google Patents
Detection method and device for removing selective catalytic reduction carrier Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 139
- 238000010531 catalytic reduction reaction Methods 0.000 title claims abstract description 39
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 141
- 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 58
- 239000004202 carbamide Substances 0.000 claims abstract description 58
- 238000001914 filtration Methods 0.000 claims abstract description 47
- 238000002347 injection Methods 0.000 claims abstract description 33
- 239000007924 injection Substances 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 25
- 230000008569 process Effects 0.000 claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 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
- 239000007789 gas Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000006722 reduction reaction Methods 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
- 230000010354 integration Effects 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
- 230000009467 reduction Effects 0.000 description 2
- 239000007921 spray Substances 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
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000446 fuel Substances 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
- 238000000746 purification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 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
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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]
-
- 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
-
- 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
Abstract
The application discloses a detection method and a detection device for removing a selective catalytic reduction carrier. The method comprises the following steps: in response to the urea injection signal, injecting urea into an upstream line of the selective catalytic reduction SCR device; the urea injection signal carries a preset detection signal; acquiring a nitrogen oxide response signal from a pipeline at the downstream of the SCR device; filtering the oxynitride response signal to obtain a filtered signal; the filtering process is used for filtering out signal components of preset detection signals in the nitric oxide response signals; based on the NOx response signal and the filtered signal, it is detected whether an SCR carrier of the SCR device is removed. Thus, 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 detection method and device for removing a selective catalytic reduction carrier.
Background
SCR (SELECTIVE CATALYTIC Reduction) technology is an exhaust gas treatment technology applied to a diesel engine aftertreatment system, which can perform a chemical reaction through a catalyst on an SCR carrier to convert harmful nitrogen oxides in exhaust gas into harmless nitrogen. However, the SCR carrier in the SCR device may be removed, resulting in exhaust gas pollutants exceeding the regulatory standards, causing environmental pollution.
To address this issue, it is currently possible to detect whether an SCR carrier is removed by SCR conversion efficiency. When the SCR conversion efficiency decreases, it is determined that the SCR carrier is removed. However, many factors affecting the SCR conversion efficiency, such as sulfur poisoning of the catalyst on the SCR carrier, and unstable engine operating conditions, may result in a decrease in the SCR conversion efficiency. Therefore, whether the SCR carrier in the SCR device is removed or not is detected based on the SCR conversion efficiency, the reliability is low, and the accuracy of the detection result is insufficient.
Disclosure of Invention
The embodiment of the application provides a detection method and a detection device for removing a selective catalytic reduction carrier, which are used for solving the problems of low reliability and insufficient accuracy of detection results of the existing method for detecting whether an SCR carrier is removed or not.
In a first aspect, an embodiment of the present application provides a method for detecting removal of a selective catalytic reduction carrier, including:
In response to the urea injection signal, injecting urea into an upstream line of the selective catalytic reduction SCR device; the urea injection signal carries a preset detection signal;
Acquiring a nitrogen oxide response signal from a pipeline at the downstream of the SCR device;
Filtering the oxynitride response signal to obtain a filtered signal; the filtering process is used for filtering out signal components of the preset detection signals in the oxynitride response signals;
Based on the NOx response signal and the filtered signal, it is detected whether an SCR carrier of the SCR device is removed.
Optionally, the detecting whether the SCR carrier of the SCR device is removed based on the nox response signal and the filtered signal includes:
acquiring a signal difference between the oxynitride response signal and the filtered signal;
integrating the signal difference to obtain an integrated value;
Detecting whether the SCR carrier is removed based on the integral amount.
Optionally, the detecting whether the SCR carrier is removed based on the integral amount includes:
obtaining a detection result indicating that the SCR carrier is removed when the integral is greater than or equal to an integral threshold;
and when the integral quantity is smaller than an integral quantity threshold value, obtaining a detection result which indicates that the SCR carrier is not removed.
Optionally, after the obtaining of the detection result indicating that the SCR carrier is removed, the method further comprises:
re-detecting whether an SCR carrier of the SCR device is removed based on the nox response signal and the filtered signal;
And 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.
Optionally, before the injecting urea into the upstream line of the selective catalytic reduction SCR device, the method further comprises:
and when the engine does not pass through the reverse driving working condition, increasing the inlet temperature of the SCR device to a preset temperature, and controlling the duration that the inlet temperature is at the preset temperature to last for a preset duration.
In a second aspect, an embodiment of the present application provides a detection apparatus for selective catalytic reduction carrier removal, including:
the urea injection module is used for responding to the urea injection signal and injecting urea into 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 from a pipeline at the downstream of the SCR device;
The filtering processing module is used for carrying out filtering processing on the oxynitride response signal to obtain a filtering signal; the filtering process is used for filtering out signal components of the preset detection signals in the oxynitride response signals;
And the signal detection module is used for detecting whether the SCR carrier of the SCR device is removed or not based on the nitrogen oxide response signal and the filtering signal.
Optionally, the signal detection module includes:
The signal difference acquisition module is used for acquiring a signal difference between the oxynitride response signal and the filtering signal;
The integrating module is used for integrating the signal difference to obtain an integrated quantity;
An integral amount detection module for detecting whether the SCR carrier is removed based on the integral amount.
Optionally, the integral quantity detection module is specifically configured to:
obtaining a detection result indicating that the SCR carrier is removed when the integral is greater than or equal to an integral threshold;
and when the integral quantity is smaller than an integral quantity threshold value, obtaining a detection result which indicates that the SCR carrier is not removed.
Optionally, the detection device for selective catalytic reduction carrier removal 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 larger than or equal to a number threshold value.
Optionally, the detection device 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 does not pass through a reverse traction working condition, and controlling the duration that the inlet temperature is at the preset temperature to last for a preset duration.
From the above technical solutions, the embodiment of the present application has the following advantages:
In the embodiment of the application, when urea is injected into the upstream pipeline of the selective catalytic reduction SCR device in response to the urea injection signal carrying the preset detection signal, the nitrogen oxide response signal can be obtained in the downstream pipeline of the SCR device, and the nitrogen oxide response signal is filtered to obtain the filtering signal, wherein the filtering processing is used for filtering out the signal component of the preset detection signal in the nitrogen oxide response signal. It is then possible to detect whether the SCR carrier is removed based on the nox response signal and the filtered signal. Because urea is sprayed into the upstream pipeline of the SCR device when the SCR carrier in the SCR device is not removed, the signal component of a preset detection signal in the nitrogen oxide response signal in the downstream pipeline can be weakened; when the SCR carrier is removed, urea is sprayed into an upstream pipeline of the SCR device, and a signal component of a preset detection signal in a nitrogen oxide response signal in a 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 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 removal of a selective catalytic reduction carrier according to an embodiment of the present application;
FIG. 2 is a flow chart of another method for detecting selective catalytic reduction carrier removal according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a detection device for removing a selective catalytic reduction carrier according to an embodiment of the present application.
Detailed Description
As described above, the inventors found in studies on SCR carriers that: whether an SCR carrier is removed can currently be detected by SCR conversion efficiency. When the SCR conversion efficiency decreases, it is determined that the SCR carrier is removed. However, many factors affecting the SCR conversion efficiency, such as sulfur poisoning of the catalyst on the SCR carrier, and unstable engine operating conditions, may result in a decrease in the SCR conversion efficiency. Therefore, whether the SCR carrier in the SCR device is removed or not is detected based on the SCR conversion efficiency, the reliability is low, and the accuracy of the detection result is insufficient.
In order to solve the above problems, an embodiment of the present application provides a detection method for removing a selective catalytic reduction carrier, 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 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 used for filtering out a signal component of a preset detection signal in the nitrogen oxide response signal. It is then possible to detect whether the SCR carrier is removed based on the nox response signal and the filtered signal.
Because urea is sprayed into the upstream pipeline of the SCR device when the SCR carrier in the SCR device is not removed, the signal component of a preset detection signal in the nitrogen oxide response signal in the downstream pipeline can be weakened; when the SCR carrier is removed, urea is sprayed into an upstream pipeline of the SCR device, and a signal component of a preset detection signal in a nitrogen oxide response signal in a 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 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 more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Fig. 1 is a flowchart of a detection method for removing a selective catalytic reduction carrier according to an embodiment of the present application. Referring to fig. 1, a method for detecting removal of a selective catalytic reduction carrier according to an embodiment of the present application may include:
s101: in response to the urea injection signal, urea is injected into an upstream line of the selective catalytic reduction SCR device.
The urea injection signal may carry a preset detection signal, for example, a square wave signal with frequency f and amplitude a. It can be appreciated that the SCR technology is a purification technology for nitrogen oxides in diesel engine emissions, which can inhibit the generation of particulate pollutants in a cylinder by optimizing, then injecting and injecting a cylinder structure, then injecting urea with a certain concentration into an upstream pipeline, and under the action of a catalyst on an SCR carrier, NH 3 generated after high-temperature hydrolysis can be preferentially selected to undergo a reduction reaction with nitrogen oxides in the exhaust gas to generate N 2 and water, so that harmful nitrogen oxides are converted into harmless nitrogen, and the control of diesel engine pollutant emissions is completed. Therefore, under the condition that urea is injected into an upstream pipeline of the selective catalytic reduction SCR device and a certain time delay is passed, a nitrogen oxide sensor of a downstream pipeline can obtain a nitrogen oxide response signal along with chemical reaction between the urea and nitrogen oxide. Based on this, after a preset detection signal is applied to the urea injection signal, urea may be injected into an upstream line of the SCR device in response to the urea injection signal. After a certain time delay, a nitrogen oxide response signal can be acquired from a downstream pipeline of the SCR device, and the nitrogen oxide response signal carries a signal component of a preset detection signal.
In addition, the method for determining the urea injection amount corresponding to the urea injection into the upstream pipeline of the SCR device according to the embodiment of the present application may not be specifically limited, and 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 the urea injection amount may be determined based on an operation condition of the aftertreatment system.
S102: a nox response signal is acquired at a downstream line of the SCR device.
Based on the analysis, the nox response signal carries a signal component of the predetermined detection signal.
S103: and filtering the oxynitride response signal to obtain a filtered signal.
The filtering process may be used to filter out a signal component of a preset 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 delay system, urea is sprayed into an upstream pipeline of the SCR device at the moment, and a signal component of a preset detection signal in a nitrogen oxide response signal in a downstream pipeline can be found to be weakened after a certain delay. When the SCR carrier is removed, the first-order delay system is not present, and urea is sprayed into an upstream pipeline of the SCR device, the signal component of a preset detection signal in a nitrogen oxide response signal in a downstream pipeline is not weakened. Therefore, it is possible to determine whether the signal component is weakened based on the unprocessed nox response signal and the filtered signal obtained after the filtering process, thereby detecting whether the SCR carrier is removed.
S104: based on the NOx response signal and the filtered signal, it is detected whether an SCR carrier of the SCR device is removed.
Embodiments of the present application may not be particularly limited with respect to the implementation of detecting whether an SCR carrier is removed, and for ease of understanding, the following description is provided in connection with one possible implementation.
As a possible implementation manner, S104 may specifically include: acquiring a signal difference between the oxynitride response signal and the filtered signal; integrating the signal difference to obtain an integrated quantity; whether the SCR carrier is removed is detected based on the integral amount. The larger the integral amount corresponding to the signal difference between the nitrogen oxide response signal and the filtering signal, the more the signal component of the preset detection signal is filtered, that is, after urea is sprayed into the 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, so that the SCR carrier is removed. Accordingly, the smaller the integral corresponding to the signal difference between the nox response signal and the filtered signal, the less the signal component of the filtered preset detection signal, that is, the signal component of the preset detection signal in the nox response signal in the downstream line is attenuated after urea is injected into the upstream line of the SCR device, and thus the SCR carrier is not removed. It can be seen that, by the integral amount corresponding to the signal difference between the oxynitride response signal and the filtered signal, it can be determined whether the signal component in the preset detection signal is weaker, so that it can be accurately detected whether the SCR carrier is removed.
Correspondingly, detecting whether the SCR carrier is removed based on the integral amount may specifically include: when the integral quantity is greater than or equal to the integral quantity threshold value, a detection result indicating that the SCR carrier is removed is obtained; and when the integral quantity is smaller than the integral quantity threshold value, obtaining a detection result which indicates that the SCR carrier is not removed.
In addition, after the detection result indicating that the SCR carrier is removed is obtained, the accuracy of the detection result can be further improved through a cyclic detection mode. Specifically, after obtaining the detection result indicating that the SCR carrier is removed, the detection method for removing the SCR carrier may further include: re-detecting whether an SCR carrier of the SCR device is removed based on the nox response signal and the filtered signal; and 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. It will be appreciated that in a cyclical detection approach, if the number of detection results that indicate 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 a reminder may be issued directly. If there is a detection result indicating that the SCR carrier has not been removed, it may be indicated that erroneous judgment occurs in the removal judgment process of the SCR carrier, so that the detection may be stopped. In addition, the embodiment of the application can send out a fault prompt through various implementation modes, and is exemplified below.
As an example, if the detection result indicating that the SCR carrier is removed can be uploaded to the cloud server, a fault alert may be sent by the cloud server in a manner of sending information. For example, the cloud server may be communicatively connected to a terminal device associated with the vehicle, so as to send the detection result and/or the fault reminding information, which indicate that the SCR carrier is removed, to a vehicle detection personnel. 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, etc., or any combination thereof.
As another example, if the motor vehicle is configured with an information reminder, a fault reminder may be issued by the information reminder. For example, the information reminding device may be a vehicle-mounted display screen, and send out fault reminding in a manner of displaying the detection result and/or the fault reminding information indicating that the SCR carrier is removed through the vehicle-mounted display screen. Or the information reminding device can be a sound generating device, and the fault reminding is sent out in a mode that the sound generating device sends out prompt tones. The prompting sound may be a preset ringing sound effect, or may be a voice broadcast of the detection result and/or the fault reminding information indicating that the SCR carrier is removed.
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, applying a preset detection signal to the urea injection signal. Therefore, the condition for the detection logic for removing the SCR carrier is set in combination with the SCR conversion efficiency, so that the accuracy of a 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 description of S101-S104, in the embodiment of the present application, since urea is injected into the upstream pipeline 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 downstream pipeline is weakened; when the SCR carrier is removed, urea is sprayed into an upstream pipeline of the SCR device, and a signal component of a preset detection signal in a nitrogen oxide response signal in a 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 a 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 acquire a more accurate nitrogen oxide response signal from a pipeline downstream of the SCR device in a mode of increasing the emission amount of nitrogen oxides, thereby being beneficial to effectively detecting whether the SCR carrier is removed. In response thereto, the present application may also provide another detection method of selective catalytic reduction carrier removal. The method for detecting the removal of the selective catalytic reduction carrier will be described below with reference to examples and drawings, respectively.
Fig. 2 is a flowchart of another method for detecting removal of a selective catalytic reduction carrier according to an embodiment of the present application. Referring to fig. 2, a method for detecting removal of a selective catalytic reduction carrier according to an embodiment of the present application may include:
s201: and when the engine does not pass through the reverse traction working condition, the inlet temperature of the SCR device is increased to a preset temperature, and the duration that the inlet temperature is at the preset temperature is controlled to last for a preset duration.
The back-towing condition refers to a condition that the vehicle engine has no power demand when running to a road condition such as downhill, coasting and the like. When the engine enters a reverse towing working condition, the engine does not spray oil and the SCR device does not spray urea, and at the moment, the temperature of the SCR carrier is greatly reduced by air passing through the SCR device. When the engine is in the fuel injection operation again, the reduction of the temperature of the SCR carrier can lead to the reduction of the SCR conversion efficiency and the increase of the emission of nitrogen oxides. When the engine does not pass through the reverse-dragging working condition, in order to increase the emission 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 last for the preset duration, and in the process, NH 3 adsorbed by the active site of the catalyst on the SCR carrier begins to escape due to the influence of high temperature, so that the SCR conversion efficiency is reduced, and the emission of nitrogen oxides is increased.
S202: in response to the urea injection signal, injecting urea into an upstream line of the selective catalytic reduction SCR device; the urea injection signal carries a preset detection signal.
S203: a nox response signal is acquired at a downstream line of the SCR device.
S204: filtering the oxynitride response signal to obtain a filtered signal; the filtering process is used for filtering out signal components of a preset detection signal in the oxynitride 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.
As can be seen from the above description, the detection method for removing the SCR carrier provided by the embodiment of the present application can obtain a more accurate response signal of nitrogen oxides from the downstream pipeline of the SCR device by increasing the emission of nitrogen oxides, thereby being helpful for effectively detecting 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 detection device for removal of the selective catalytic reduction carrier will be described below with reference to examples and drawings, respectively.
Fig. 3 is a schematic structural diagram of a detection device for removing a selective catalytic reduction carrier according to an embodiment of the present application. Referring to fig. 3, a detection apparatus 300 for selective catalytic reduction carrier removal according to an embodiment of the present application may include:
A urea injection module 301 for injecting urea into an upstream line of the selective catalytic reduction SCR device in response to a urea injection signal; the urea injection signal carries a preset detection signal;
the signal acquisition module 302 is configured to acquire a nitrogen oxide response signal from a downstream pipeline of the SCR device;
The filtering processing module 303 is configured to perform filtering processing on the oxynitride response signal to obtain a filtered signal; the filtering process is used for filtering out signal components of preset detection signals in the nitric oxide response signals;
The signal detection module 304 is configured to detect whether an 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 nitrogen oxide response signal and the filtering signal related to the signal component, so that the reliability and the accuracy of detection are improved.
In order to effectively detect whether the SCR carrier is removed, and to 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 nitric oxide response signal and the filtering signal;
the integrating module is used for integrating the signal difference to obtain an integrated quantity;
and the integration quantity detection module is used for detecting whether the SCR carrier is removed or not based on the integration quantity.
As an embodiment, to effectively detect whether the SCR carrier is removed, to improve the reliability and accuracy of the detection, the integral amount detection module may specifically be used to:
When the integral quantity is greater than or equal to the integral quantity threshold value, a detection result indicating that the SCR carrier is removed is obtained;
And when the integral quantity is smaller than the integral quantity threshold value, obtaining a detection result which indicates that the SCR carrier is not removed.
As an embodiment, to effectively detect whether the SCR carrier is removed, to improve reliability and accuracy of detection, the detection apparatus 300 for removing the SCR carrier may further include:
the re-detection module is used for re-detecting whether the SCR carrier of the SCR device is removed or not based on the nitrogen oxide response signal and the filtering 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 larger than or equal to a number threshold value.
As an embodiment, to effectively detect whether the SCR carrier is removed, to improve reliability and accuracy of detection, the detection apparatus 300 for removing the SCR carrier may further include:
The SCR device control module is used for increasing the inlet temperature of the SCR device to a preset temperature when the engine does not pass through a reverse-dragging working condition, and controlling the duration that the inlet temperature is at the preset temperature to last for a preset duration.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (8)
1. A method for detecting removal of a selective catalytic reduction support, comprising:
When the engine does not pass through a reverse driving condition, increasing the inlet temperature of the selective catalytic reduction SCR device to a preset temperature, and controlling the duration that the inlet temperature is at the preset temperature to last for a preset duration;
injecting urea into an upstream line of the SCR device in response to a urea injection signal; the urea injection signal carries a preset detection signal, and the preset detection signal is applied to the urea injection signal when the SCR conversion efficiency is greater than or equal to an efficiency threshold;
Acquiring a nitrogen oxide response signal from a pipeline at the downstream of the SCR device;
Filtering the oxynitride response signal to obtain a filtered signal; the filtering process is used for filtering out signal components of the preset detection signals in the oxynitride response signals;
Based on the NOx response signal and the filtered signal, it is detected whether an SCR carrier of the SCR device is removed.
2. The method of claim 1, wherein the detecting whether the SCR carrier of the SCR device is removed based on the nox response signal and the filtered signal comprises:
acquiring a signal difference between the oxynitride response signal and the filtered signal;
integrating the signal difference to obtain an integrated value;
Detecting whether the SCR carrier is removed based on the integral amount.
3. The method of claim 2, wherein the detecting whether the SCR carrier is removed based on the integral amount comprises:
obtaining a detection result indicating that the SCR carrier is removed when the integral is greater than or equal to an integral threshold;
and when the integral quantity is smaller than an integral quantity threshold value, obtaining a detection result which indicates that the SCR carrier is not removed.
4. A method according to claim 3, wherein after the detection result indicating that the SCR carrier is removed is obtained, the method further comprises:
re-detecting whether an SCR carrier of the SCR device is removed based on the nox response signal and the filtered signal;
And 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.
5. A selective catalytic reduction support removal detection device, comprising:
The SCR device control module is used for increasing the inlet temperature of the selective catalytic reduction SCR device to a preset temperature when the engine does not pass through a reverse-dragging working condition, and controlling the duration that the inlet temperature is at the preset temperature to last for a preset duration;
the urea injection module is used for responding to a urea injection signal and injecting urea to an upstream pipeline of the SCR device; the urea injection signal carries a preset detection signal, and the preset detection signal is applied to the urea injection signal when the SCR conversion efficiency is greater than or equal to an efficiency threshold;
The signal acquisition module is used for acquiring a nitrogen oxide response signal from a pipeline at the downstream of the SCR device;
The filtering processing module is used for carrying out filtering processing on the oxynitride response signal to obtain a filtering signal; the filtering process is used for filtering out signal components of the preset detection signals in the oxynitride response signals;
And the signal detection module is used for detecting whether the SCR carrier of the SCR device is removed or not based on the nitrogen oxide response signal and the filtering signal.
6. The apparatus of claim 5, wherein the signal detection module comprises:
The signal difference acquisition module is used for acquiring a signal difference between the oxynitride response signal and the filtering signal;
The integrating module is used for integrating the signal difference to obtain an integrated quantity;
An integral amount detection module for detecting whether the SCR carrier is removed based on the integral amount.
7. The device according to claim 6, wherein the integral amount detection module is specifically configured to:
obtaining a detection result indicating that the SCR carrier is removed when the integral is greater than or equal to an integral threshold;
and when the integral quantity is smaller than an integral quantity threshold value, obtaining a detection result which indicates that the SCR carrier is not removed.
8. The apparatus as recited in claim 7, 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 larger than or equal to a number threshold value.
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