CN114810289A - Method and device for detecting state of SCR system, electronic equipment and vehicle - Google Patents
Method and device for detecting state of SCR system, electronic equipment and vehicle Download PDFInfo
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- CN114810289A CN114810289A CN202110649001.9A CN202110649001A CN114810289A CN 114810289 A CN114810289 A CN 114810289A CN 202110649001 A CN202110649001 A CN 202110649001A CN 114810289 A CN114810289 A CN 114810289A
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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
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
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- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
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Abstract
The embodiment of the application relates to the technical field of vehicle exhaust treatment, in particular to a method and a device for detecting the state of an SCR system and a vehicle. And detecting a urea system in the SCR system in the running process of the vehicle, wherein when the urea system fails, the urea system is the SCR system which fails. When the urea system is in a normal working state, acquiring a first nitrogen and oxygen flow rate of a first position on one side of an SCR inlet within a preset time period and a second nitrogen and oxygen flow rate of a second position on one side of an SCR outlet within the preset time period, then acquiring the conversion efficiency of the SCR according to the first nitrogen and oxygen flow rate and the second nitrogen and oxygen flow rate, and determining whether the SCR fails according to the conversion efficiency. When the urea system is in a normal working state, the SCR is determined to be in fault, and the SCR body can be considered to be in fault, so that the effect of detecting the SCR in fault is realized.
Description
Technical Field
The embodiment of the application relates to the technical field of vehicle exhaust treatment, in particular to a method and a device for detecting the state of an SCR system and a vehicle.
Background
According to advanced development experience of developed countries in the vehicle industry, the exhaust aftertreatment technology must be combined to control the emission of NOx and PM, the emission of PM is reduced through the internal purification technology, and then the emission of NOx is reduced through the selective catalytic reduction technology SCR, so that the emission of NOx and PM is reduced at the same time. By adopting the SCR exhaust aftertreatment technology, the engine body is slightly changed, the durability is improved, the emission can be effectively reduced, and 2-3% of fuel oil of a diesel engine can be saved.
In the related art, when the SCR system fails, the vehicle cannot be detected in time, resulting in emission of vehicle exhaust without sufficient treatment.
Disclosure of Invention
The embodiment of the application provides a method and a device for detecting the state of an SCR system and a vehicle, and aims to solve the problem that the vehicle cannot detect that an SCR fails in time.
In a first aspect, an embodiment of the present application provides a method for detecting a state of an SCR system, where the SCR system is based on a selective catalytic reduction system, and includes a urea system and a body of the SCR, and the method includes:
when the vehicle is in a running state, acquiring the working state of the urea system;
when the urea system is in a normal working state, acquiring a first nitrogen and oxygen flow rate of a first position in a preset time period and a second nitrogen and oxygen flow rate of a second position in the preset time period after a preset delay, wherein the first position is positioned at an inlet of the SCR, and the second position is positioned at an outlet of the SCR;
determining the conversion efficiency of the SCR according to the first nitrogen and oxygen flow and the second nitrogen and oxygen flow;
and determining whether the SCR fails according to the conversion efficiency of the SCR.
Optionally, when the urea system is in a normal operating state, acquiring a first flow rate of nitrogen and oxygen at a first position within a preset time period, and acquiring a second flow rate of nitrogen and oxygen at a second position within the preset time period after a preset delay, including:
when the urea spray head is unblocked and the urea pipeline is unblocked, acquiring a first nitrogen and oxygen flow of a first position in a preset time period and a second nitrogen and oxygen flow of a second position in the preset time period after a preset delay
Optionally, the obtaining a first flow rate of the first location within a preset time period and a second flow rate of the second location within the preset time period after a preset delay includes:
acquiring the exhaust flow of the SCR;
acquiring each first nitrogen-oxygen concentration of the first position in the preset time period, and determining the first nitrogen-oxygen flow according to each first nitrogen-oxygen concentration and the exhaust gas flow;
and acquiring each second nitrogen concentration of the second position in the preset time period, and determining the second nitrogen flow according to each second nitrogen concentration and the exhaust gas flow.
Optionally, the conversion efficiency of the SCR is determined according to the first flow rate of nitrogen and the second flow rate of nitrogen, wherein:
and obtaining a difference value according to the first nitrogen and oxygen flow and the second nitrogen and oxygen flow, wherein the difference value is the conversion amount of the SCR, and the conversion efficiency of the SCR is obtained according to the difference value and the first nitrogen and oxygen flow.
Optionally, the predetermined delay is a length of time required for exhaust gases of the vehicle to flow from the first location to the second location.
Alternatively, the engine ECU reports the failure information in the case where it is determined that the SCR has failed for a preset number of consecutive times.
Optionally, determining whether the SCR is faulty according to the conversion efficiency of the SCR, wherein; and when the conversion efficiency of the SCR is not higher than the preset conversion efficiency, determining that the SCR fails.
A second aspect of the embodiments of the present application provides a monitoring device, including:
the information acquisition module is used for acquiring the working state of the urea system when the vehicle is in a running state;
the flow acquisition module is used for acquiring a first nitrogen and oxygen flow of a first position in a preset time period and a second nitrogen and oxygen flow of a second position in the preset time period after a preset delay when the urea system works normally, wherein the first position is positioned at an inlet of a Selective Catalytic Reduction (SCR) system, and the second position is positioned at an outlet of the SCR system;
an efficiency calculation module for determining a conversion efficiency of the SCR based on the first and second flow rates;
a determination module to determine whether the SCR is malfunctioning based on a conversion efficiency of the SCR.
A third aspect of the embodiments of the present application provides an electronic device, including:
a memory for storing a computer program;
a processor for executing a computer program stored on the memory to implement the method provided by the first aspect.
A fourth aspect of the embodiments of the present application provides a vehicle, including a detection device, where the detection device is configured to implement the method provided in the first aspect.
By adopting the method and the device for detecting the state of the SCR system and the vehicle, the urea system in the SCR system is detected in the running process of the vehicle, and when the urea system fails, the SCR system fails. When the urea system is in a normal working state, acquiring a first nitrogen and oxygen flow rate at a first position on one side of an SCR inlet within a preset time period and a second nitrogen and oxygen flow rate at a second position on one side of an SCR outlet within the preset time period, then acquiring the conversion efficiency of the SCR according to the first nitrogen and oxygen flow rate and the second nitrogen and oxygen flow rate, and determining whether the SCR fails according to the conversion efficiency. When the urea system is in a normal working state, the SCR is determined to be in fault, and the SCR body can be considered to be in fault, so that the effect of detecting the SCR in fault is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a detection method according to an embodiment of the present application;
fig. 2 is a schematic block diagram of a detection apparatus according to an embodiment of the present application;
fig. 3 is a block diagram of a traffic acquisition module according to an embodiment of the present application;
fig. 4 is a schematic block diagram of an electronic device according to an embodiment of the present application.
Detailed Description
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 some, but not all, embodiments of the present application. 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.
The SCR system mainly comprises a urea system, a body and a control system. The catalyst is coated on the carrier in the body, so that the reduction reaction rate of NOx can be accelerated. The urea system provides high-pressure injection power for the urea nozzle, and urea liquid drops are fully atomized, so that the conversion efficiency of NOx is improved. The control system accurately controls the urea injection quantity in real time according to the working condition of the engine, detects the running condition of the SCR system, and can take corresponding treatment measures when the system breaks down.
In the related art, whether the SCR system breaks down or not can not be detected in time, when the SCR body breaks down, the chemical reaction for reacting NOx can not be carried out due to lack of participation of a catalyst, so that tail gas is discharged without being fully treated, and the environmental pollution is large.
Example one
In view of this, the present embodiment provides a method for detecting a state of an SCR system, and with reference to fig. 1, the method includes:
s1, acquiring the working state of the urea system when the vehicle is in a running state;
when the SCR treats the tail gas, two parts are adopted, namely, urea is injected through a urea system, so that NH is generated 3 Is II NH 3 By catalytic reaction of NH while passing over SCR body 3 React with Nox. When the vehicle produces tail gas in the driving process, at first detect the operating condition of urea system, obtain the operating condition of urea system to confirm whether urea system breaks down, be equivalent to the SCR system and break down when urea system breaks down, just can continue to detect the SCR body when urea system normally works.
S2, when the urea system works normally, acquiring a first nitrogen and oxygen flow rate of a first position in a preset time period and a second nitrogen and oxygen flow rate of a second position in the preset time period after a preset delay, wherein the first position is located at an inlet of the SCR, and the second position is located at an outlet of the SCR;
the first location is at the inlet of the SCR where the measured data is of the non-SCR treated exhaust gas and the second location is at the outlet of the SCR where the measured data is of the SCR treated exhaust gas.
The method comprises the steps of starting to detect tail gas at a first position, enabling the detected tail gas to pass through an SCR after a preset delay, reaching a second position after SCR treatment, starting to detect the tail gas at the second position, wherein the tail gas is the same as the tail gas at the first position, stopping detection after a preset time period, and obtaining the first nitrogen oxygen content at the first position and the second nitrogen oxygen content at the second position in the tail gas within the preset time period for detecting the SCR state subsequently.
The preset time period may be 1 hour in the present embodiment, and the duration of the preset time period may be half an hour, 2 hours, and the like in other embodiments, and may be set according to the vehicle condition.
S3, determining the conversion efficiency of the SCR according to the first nitrogen and oxygen flow rate and the second nitrogen and oxygen flow rate;
and obtaining a difference value according to the first nitrogen and oxygen flow and the second nitrogen and oxygen flow, wherein the difference value is the conversion amount of the SCR, and the conversion efficiency of the SCR is obtained according to the difference value and the first nitrogen and oxygen flow.
In this embodiment, the first nitrogen content is NOx1, the second nitrogen content is NOx2, and the resulting NOx1 and NOx2 are substituted into the SCR conversion efficiency equation:
and obtaining eta which is the conversion efficiency of the SCR in the preset time period.
And S4, determining whether the SCR is in failure according to the conversion efficiency of the SCR.
And determining whether the SCR fails according to the conversion efficiency of the SCR, and when the conversion efficiency of the SCR is not higher than the preset conversion efficiency, determining that the SCR fails. In the embodiment, the preset conversion efficiency may be 30%, and when the conversion rate η of the SCR is less than or equal to 30%, it may be determined that the SCR fails, and in other embodiments, the preset conversion efficiency that determines that the SCR fails may be set according to the vehicle condition.
And detecting a urea system in the SCR system in the running process of the vehicle, wherein when the urea system fails, the urea system is the SCR system which fails. When the urea system is in a normal working state, acquiring a first nitrogen and oxygen flow rate at a first position on one side of an SCR inlet within a preset time period and a second nitrogen and oxygen flow rate at a second position on one side of an SCR outlet within the preset time period, then acquiring the conversion efficiency of the SCR according to the first nitrogen and oxygen flow rate and the second nitrogen and oxygen flow rate, and determining whether the SCR fails according to whether the conversion efficiency of the SCR is lower than a critical value. When the urea system is in a normal working state, the SCR is determined to be in fault, and the SCR body can be considered to be in fault, so that the effect of detecting the fault of the SCR is realized.
Wherein, when urea system is in normal operating condition, obtain the first nitrogen oxygen flow of first position in the time quantum of predetermineeing to and the second nitrogen oxygen flow of second position in the time quantum of predetermineeing after the predetermined delay, include: when the urea spray head is unblocked and the urea pipeline is unblocked, a first nitrogen and oxygen flow of a first position in a preset time period and a second nitrogen and oxygen flow of a second position in the preset time period after a preset delay are obtained.
SCR divide into urea system and body two parts, because the body breaks down mostly ageing, unable direct detection, consequently detect urea system earlier, including whether the urea shower nozzle blocks up and whether the urea pipeline blocks up, when arbitrary department takes place to block up, urea all can't normally spray, just can think SCR breaks down, in this embodiment, can detect through flow sensor or pressure sensor, also can detect through other modes in other embodiments, as long as can detect urea shower nozzle and urea pipeline and whether switch on can.
When the urea sprayer and the urea pipeline are unblocked, urea can be normally sprayed, the urea system is in a normal state, and when the SCR is detected to be in fault, the SCR body can be considered to be in fault, such as aging and other conditions.
Wherein, obtain the first nitrogen oxygen flow of first position in the time quantum of predetermineeing to and the second nitrogen oxygen flow of second position in the time quantum of predetermineeing after the predetermined delay, include:
acquiring the exhaust flow of the SCR;
acquiring each first nitrogen and oxygen concentration of a first position in a preset time period, and determining a first nitrogen and oxygen flow according to each first nitrogen and oxygen concentration and the exhaust flow;
and acquiring each second nitrogen concentration of the second position in a preset time period, and determining the second nitrogen flow according to each second nitrogen concentration and the exhaust gas flow.
When the first nitrogen-oxygen concentration is obtained, firstly detecting the flow of the tail gas, and simultaneously detecting the first nitrogen-oxygen concentration NOxup in the tail gas when the tail gas flows through the first position, and then according to the following steps:
NOx1 ═ NOxup × exhaust flow dt
Wherein t is the duration of a preset time period to obtain a first nitrogen oxygen flow, and in a similar way, detecting a second nitrogen oxygen concentration Noxdown in the tail gas when the tail gas flows through a second position, and then according to:
NOx2 ═ NOxdown × exhaust flow dt
Thereby deriving a second flow rate of nitrous oxide. And then substituting the obtained first nitrogen-oxygen flow and the second nitrogen-oxygen flow into a conversion efficiency formula of the SCR to obtain the conversion efficiency of the SCR.
Wherein the predetermined delay is a length of time required for the exhaust gases of the vehicle to flow from the first location to the second location.
The tail gas that detects in the time quantum of predetermineeing flows to the second position from the primary importance and detects again, guarantees that the tail gas that detects is the tail gas of agreeing the period to make the testing result more accurate, consequently when detecting, after the primary importance begins to detect, detect in the second position after predetermineeing the delay, it is different according to the condition of vehicle, predetermine the delay and set up according to actual conditions.
In some embodiments, the engine ECU reports a fault message in the event that the SCR is determined to be faulty a predetermined number of consecutive times.
Due to the robustness of the detection method, the SCR is detected for multiple times when whether the SCR fails or not is determined, when the SCR fails for a preset number of times, the SCR system can be determined to fail, and the engine ECU reports the SCR failure, so that a driver can know the SCR failure in time, and the accuracy of the whole detection method is improved. The preset number of times may be 3 in the present embodiment, and in other embodiments, other numbers of times may be set according to different vehicle conditions.
Example two
Based on the same inventive concept, another embodiment of the present application further provides a monitoring device, and referring to fig. 2, the monitoring device includes:
the information acquisition module is used for acquiring the working state of the urea system when the vehicle is in a running state;
when the urea system breaks down, the SCR can be considered to break down, and when the urea system is in a normal working state, if the SCR is subsequently detected to break down, the SCR body can be considered to break down.
In this embodiment, the detection may be performed by a flow sensor or a pressure sensor, or may be performed in other embodiments by other methods as long as whether the urea nozzle and the urea pipe are connected or not can be detected.
The flow acquisition module is used for acquiring a first nitrogen and oxygen flow of a first position in a preset time period and a second nitrogen and oxygen flow of a second position in the preset time period after a preset delay when the urea system is in a normal working state, wherein the first position is positioned at an inlet of the selective catalytic reduction system SCR, and the second position is positioned at an outlet of the SCR;
referring to fig. 3, in the present embodiment, the flow rate acquisition module includes a first NOx sensor installed at a first position on an inlet side of the SCR, a second NOx sensor installed at a second position on an outlet side of the SCR, and a flow rate sensor.
Sensing the exhaust flow in a preset time period through a flow sensor, then measuring a first nitrogen-oxygen concentration at a first position in real time through a first NOx sensor, and then obtaining the first nitrogen-oxygen flow according to the exhaust flow and the first nitrogen-oxygen concentration; a second flow rate of the second nitrogen oxide is obtained from the exhaust gas flow rate and the second nitrogen oxide concentration.
The efficiency calculation module is used for determining the conversion efficiency of the SCR according to the first nitrogen and oxygen flow and the second nitrogen and oxygen flow;
and calculating the conversion efficiency of the SCR according to the conversion efficiency formula of the SCR by using the first nitrogen oxygen flow rate and the second nitrogen oxygen flow rate.
And the determining module is used for determining whether the SCR is in failure according to the conversion efficiency of the SCR.
According to the conversion efficiency of the SCR, when the conversion efficiency of the SCR is lower than a preset conversion efficiency critical point, the SCR can be determined to be in fault.
Wherein, the information acquisition module is also used for executing the following steps:
when the urea spray head is unblocked and the urea pipeline is unblocked, a first nitrogen and oxygen flow of a first position in a preset time period and a second nitrogen and oxygen flow of a second position in the preset time period after a preset delay are obtained.
SCR divide into urea system and body two parts, because the body breaks down mostly ageing, unable direct detection, consequently detects urea system earlier through flow sensor or pressure sensor, whether block up and whether the urea pipeline blocks up including the urea shower nozzle, when arbitrary one takes place to block up, urea all can't normally spray, just can think SCR breaks down.
When the urea sprayer and the urea pipeline are unblocked, urea can be normally sprayed, the urea system is in a normal state, and when the SCR is detected to be in fault, the SCR body can be considered to be in fault, such as aging and other conditions.
The flow acquisition module can be further used for executing the following steps:
acquiring the exhaust flow of the SCR;
acquiring each first nitrogen and oxygen concentration of a first position in a preset time period, and determining a first nitrogen and oxygen flow according to each first nitrogen and oxygen concentration and the exhaust flow;
and acquiring each second nitrogen concentration of the second position in a preset time period, and determining the second nitrogen flow according to each second nitrogen concentration and the exhaust gas flow.
Wherein the determining module is further configured to perform the following steps:
and under the condition that the SCR is determined to be in fault continuously for a preset time, the engine ECU reports fault information.
Based on the same inventive concept, another embodiment of the present application further provides an electronic device, and with reference to fig. 4, the electronic device includes:
a memory for storing a computer program;
and the processor is used for executing the computer program stored on the memory so as to realize the method provided by the first embodiment.
Based on the same inventive concept, another embodiment of the present application further provides a vehicle, including the detection device provided in the second embodiment, and the detection device is used for implementing the method provided in the first embodiment.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one of skill in the art, embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the true scope of the embodiments of the application.
Finally, it should also be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "include", "including" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or terminal device including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such process, method, article, or terminal device. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The pedal control system and the vehicle including the same provided by the present application are described in detail above, and the principle and the implementation of the present application are explained in the present application by applying specific examples, and the description of the above examples is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A method of detecting a condition of an SCR system, the SCR comprising a urea system and a body of the SCR, the method comprising:
when the vehicle is in a running state, acquiring the working state of the urea system;
when the urea system is in a normal working state, acquiring a first nitrogen and oxygen flow rate of a first position in a preset time period and a second nitrogen and oxygen flow rate of a second position in the preset time period after a preset delay, wherein the first position is positioned at an inlet of the SCR, and the second position is positioned at an outlet of the SCR;
determining the conversion efficiency of the SCR according to the first nitrogen and oxygen flow and the second nitrogen and oxygen flow;
and determining whether the SCR fails according to the conversion efficiency of the SCR.
2. A method in accordance with claim 1, wherein obtaining a first flow rate of nitrogen and oxygen at a first location during a predetermined time period and a second flow rate of nitrogen and oxygen at a second location during the predetermined time period after a predetermined delay while the urea system is in a normal operating state comprises:
when the urea sprayer is unblocked and the urea pipeline is unblocked, a first nitrogen and oxygen flow of a first position in a preset time period and a second nitrogen and oxygen flow of a second position in the preset time period after a preset delay are obtained.
3. A method as claimed in claim 1, wherein obtaining a first flow rate of nitrogen and oxygen at the first location for a predetermined period of time and a second flow rate of nitrogen and oxygen at the second location for the predetermined period of time after a predetermined delay comprises:
acquiring the exhaust flow of the SCR;
acquiring each first nitrogen-oxygen concentration of the first position in the preset time period, and determining the first nitrogen-oxygen flow according to each first nitrogen-oxygen concentration and the exhaust gas flow;
and acquiring each second nitrogen concentration of the second position in the preset time period, and determining the second nitrogen flow according to each second nitrogen concentration and the exhaust gas flow.
4. A method according to claim 1, determining a conversion efficiency of said SCR based on said first flow rate of nitrogen and said second flow rate of nitrogen, wherein:
and obtaining a difference value according to the first nitrogen and oxygen flow and the second nitrogen and oxygen flow, wherein the difference value is the conversion amount of the SCR, and the conversion efficiency of the SCR is obtained according to the difference value and the first nitrogen and oxygen flow.
5. A method according to claim 1 or 2, characterised in that said predetermined delay is the length of time required for the exhaust gases of the vehicle to flow from said first location to said second location.
6. A method according to claim 1, characterised in that the engine ECU reports a fault message in the event that the SCR is determined to be faulty a predetermined number of consecutive times.
7. A method according to claim 1, characterized by determining whether the SCR is malfunctioning according to the conversion efficiency of the SCR, wherein:
and when the conversion efficiency of the SCR is not higher than the preset conversion efficiency, determining that the SCR fails.
8. A monitoring device, comprising:
the information acquisition module is used for acquiring the working state of the urea system when the vehicle is in a running state;
the system comprises a flow obtaining module and a control module, wherein the flow obtaining module is used for obtaining a first nitrogen and oxygen flow of a first position in a preset time period and a second nitrogen and oxygen flow of a second position in the preset time period after a preset delay when the urea system is in a normal working state, the first position is positioned at an inlet of a Selective Catalytic Reduction (SCR) system, and the second position is positioned at an outlet of the SCR;
an efficiency calculation module for determining a conversion efficiency of the SCR based on the first and second flow rates;
a determination module to determine whether the SCR is malfunctioning based on a conversion efficiency of the SCR.
9. An electronic device, comprising:
a memory for storing a computer program;
a processor for executing a computer program stored on the memory to implement the method of any one of claims 1-7.
10. A vehicle, characterized by comprising detection means for implementing the method of any one of claims 1-7.
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| CN202110649001.9A CN114810289A (en) | 2021-06-10 | 2021-06-10 | Method and device for detecting state of SCR system, electronic equipment and vehicle |
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| CN202110649001.9A CN114810289A (en) | 2021-06-10 | 2021-06-10 | Method and device for detecting state of SCR system, electronic equipment and vehicle |
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