CN112648056B - Method, device and system for monitoring SCR conversion efficiency - Google Patents
Method, device and system for monitoring SCR conversion efficiency Download PDFInfo
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- CN112648056B CN112648056B CN202011446106.6A CN202011446106A CN112648056B CN 112648056 B CN112648056 B CN 112648056B CN 202011446106 A CN202011446106 A CN 202011446106A CN 112648056 B CN112648056 B CN 112648056B
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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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2250/00—Combinations of different methods of purification
- F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
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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
- 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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/04—Methods of control or diagnosing
- F01N2900/0416—Methods of control or diagnosing using the state of a sensor, e.g. of an exhaust gas sensor
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
- F01N2900/1402—Exhaust gas composition
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1606—Particle filter loading or soot amount
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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
- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
- F01N2900/1621—Catalyst conversion efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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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)
- Exhaust Gas After Treatment (AREA)
Abstract
The method for monitoring the SCR conversion efficiency comprises the steps of obtaining the temperature of the DPF upstream; acquiring the carbon loading of the DPF according to the condition that the upstream temperature of the DPF is greater than a first limit value; acquiring the upstream temperature of the SCR according to the condition that the carbon loading of the DPF is less than a second limit value; entering an SCR efficiency monitoring window according to the condition that the SCR upstream temperature is smaller than a third limit value, the SCR efficiency monitoring request condition is met and the SCR efficiency monitoring release condition is met; integrating the NOx mass flow at the upstream of the SCR and the NOx mass flow at the downstream of the SCR according to the SCR efficiency monitoring window, and calculating the SCR conversion efficiency; and reporting the fault of low SCR conversion efficiency according to the condition that the SCR conversion efficiency is lower than a fourth limit value. The invention has the effects of effectively utilizing the DPF parking regeneration process to monitor the SCR efficiency, ensuring the normal work of the SCR and improving the SCR efficiency monitoring execution rate.
Description
Technical Field
The invention relates to the technical field of tail gas aftertreatment, in particular to a method, a device and a system for monitoring SCR conversion efficiency.
Background
This section provides background information related to the present disclosure only and is not necessarily prior art.
The existing six-diesel-engine whole vehicle currently used almost adopts an SCR route. For special purpose vehicles (such as sanitation vehicles, truck-mounted cranes and the like), due to the fact that the vehicle running load is low, the aftertreatment exhaust temperature is low, and the temperature characteristic of an SCR catalyst, nitrogen oxide emission detection cannot be carried out when the exhaust temperature is low, so that SCR efficiency monitoring cannot be executed all the time, normal work cannot be carried out, the SCR efficiency monitoring execution rate is reduced, and meanwhile, the regulation requirements are not met. Also, due to low load of operation and low exhaust temperature, carbon loading is accumulated quickly, and the DPF parking regeneration period is shortened.
Disclosure of Invention
The invention aims to at least solve the problems of effectively utilizing the DPF parking regeneration process to monitor the SCR efficiency, ensuring the normal work of the SCR and improving the SCR efficiency monitoring execution rate. The purpose is realized by the following technical scheme:
a first aspect of the invention provides a method of monitoring SCR conversion efficiency, comprising
Pressing a DPF parking regeneration switch to enter a normal parking regeneration process when the carbon loading of the DPF is higher than a seventh limit value;
acquiring the temperature of the DPF upstream;
acquiring the carbon loading of the DPF according to the condition that the upstream temperature of the DPF is greater than a first limit value;
acquiring the upstream temperature of the SCR according to the condition that the carbon loading of the DPF is less than a second limit value;
entering an SCR efficiency monitoring window according to the condition that the SCR upstream temperature is smaller than a third limit value, the SCR efficiency monitoring request condition is met and the SCR efficiency monitoring release condition is met;
integrating the NOx mass flow at the upstream of the SCR and the NOx mass flow at the downstream of the SCR according to the SCR efficiency monitoring window, and calculating the SCR conversion efficiency;
and reporting the fault of low SCR conversion efficiency according to the condition that the SCR conversion efficiency is lower than a fourth limit value.
According to the method for monitoring the SCR conversion efficiency, the parking regeneration process is effectively utilized for the special-purpose vehicle, the normal work of the SCR is ensured, and the SCR efficiency monitoring execution rate is improved.
In addition, the method for monitoring the conversion efficiency of the SCR can also have the following additional technical characteristics:
in some embodiments of the invention, the SCR efficiency monitoring request condition includes at least one of an engine run time greater than a run time limit, a vehicle mileage greater than a mileage limit, or a total fuel consumption greater than a fuel consumption limit.
In some embodiments of the invention, the SCR efficiency monitoring release conditions comprise that the SCR upstream and downstream NOx sensor collection values are valid, the SCR upstream temperature is in the range of 220-280 ℃, the SCR upstream NOx concentration is in the range of 50-1500 ppm, and the exhaust gas mass flow is in the range of 350-1600 Kg/h.
In some embodiments of the invention, the SCR conversion efficiency is calculated based on when the SCR upstream NOx mass flow integral is above a fifth limit.
In some embodiments of the invention, SCR efficiency monitoring is discontinued based on the SCR upstream NOx mass flow integral not reaching the fifth limit and SCR upstream temperature being below a sixth limit.
In some embodiments of the invention, the SCR upstream NOx mass flow and the SCR downstream NOx mass flow are measured from NOx sensors.
The invention also provides a device for monitoring the SCR conversion efficiency, which is used for executing the method for monitoring the SCR conversion efficiency in the first aspect and comprises a data receiving module, a monitoring condition judging module, an integrating module, an efficiency calculating module and a fault judging module;
the data receiving module is used for receiving and processing signals sent by an engine ECU and an NOx sensor;
the monitoring condition judging module is used for calculating the received data and judging whether the working condition of the engine can carry out efficiency monitoring or not;
the integration module is used for integrating the NOx mass flow at the upstream part of the SCR and the NOx mass flow at the downstream part of the SCR;
the efficiency calculation module is used for calculating the conversion efficiency through the integrated quality value;
and the fault judgment module is used for judging the magnitude of the fourth limit value and the actual value of the conversion efficiency so as to report a fault.
The invention also provides a system for monitoring the SCR conversion efficiency, which comprises a memory and the device for monitoring the SCR conversion efficiency, wherein the memory stores the method for monitoring the SCR conversion efficiency.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:
FIG. 1 is a schematic illustration of efficiency monitoring during a cooling phase of a park regeneration process according to the present application;
FIG. 2 is a flow chart of SCR efficiency monitoring of the present application;
FIG. 3 is a schematic view of an SCR conversion efficiency system of the present application.
Reference numerals:
1. a light-off stage; 2. a DPF regeneration stage; 3. a cooling stage; 4. SCR efficiency monitoring window.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
As shown in FIGS. 1-2, according to an embodiment of the present invention, a method for monitoring SCR conversion efficiency is provided, comprising
S1, acquiring the temperature of the DPF upstream;
s2, acquiring the carbon loading of the DPF according to the condition that the upstream temperature of the DPF is greater than a first limit value;
s3, acquiring the SCR upstream temperature according to the condition that the carbon loading of the DPF is smaller than a second limit value;
s4, entering an SCR efficiency monitoring window according to the condition that the SCR upstream temperature is smaller than a third limit value, the SCR efficiency monitoring request condition is met and the SCR efficiency monitoring release condition is met;
and S5, integrating the mass flow of the NOx upstream of the SCR and the mass flow of the NOx downstream of the SCR according to the SCR efficiency monitoring window, and calculating the SCR conversion efficiency.
And S6, reporting the fault of low SCR conversion efficiency according to the fact that the SCR conversion efficiency is lower than the fourth limit value.
The specific operation steps are as follows: as shown in the figures 1-2 of the drawings,
when the carbon load of the DPF is higher than a limit value (such as 4g/L), a DPF parking regeneration switch is pressed to enter a normal parking regeneration process.
S1, acquiring the temperature of the DPF upstream through a temperature sensor;
s2, entering a DPF regeneration stage and acquiring DPF carbon loading according to the condition that the temperature of the upstream of the DPF is greater than a first limit value (such as 250 ℃);
s3, entering a cooling stage and acquiring the SCR upstream temperature according to the condition that the carbon loading of the DPF is smaller than a second limit value (such as 0.3 g/L);
s4, entering an SCR efficiency monitoring window according to the condition that the SCR upstream temperature is lower than a third limit value (such as 280 ℃), the condition of the SCR efficiency monitoring request is met, the condition of the SCR efficiency monitoring release is met, and entering the SCR efficiency monitoring window when the SCR efficiency monitoring request is met and the condition of the SCR efficiency monitoring release is met;
and S5, integrating the mass flow rate of the NOx upstream of the SCR (the integral value is m1) and the mass flow rate of the NOx downstream of the SCR (the integral value is m2) according to the SCR efficiency monitoring window, and calculating the SCR conversion efficiency, wherein the mass flow rate of the NOx upstream of the SCR and the mass flow rate of the NOx downstream of the SCR are acquired by NOx sensors.
When the SCR upstream NOx mass flow integral value reaches a fifth limit (e.g., 10g), the SCR conversion efficiency calculation is started.
SCR conversion efficiency is [ (m 1-m 2)/m1 ]. multidot.100%
When the calculated SCR conversion efficiency is lower than a fourth limit value (such as 75%), a fault with low SCR conversion efficiency is reported, otherwise, a normal SCR conversion efficiency is reported without fault. In the integral window, if the mass flow integral value of the NOx at the upstream of the SCR does not reach a fifth limit value (such as 10g) but the temperature at the upstream of the SCR is lower than a sixth limit value (such as 220 ℃), the efficiency monitoring is stopped, a relevant integrator is cleared, and no result is output in the SCR efficiency monitoring at the parking regeneration cooling stage.
Further, the SCR efficiency monitoring request conditions include: the engine running time is more than the running time limit (such as 300h), the vehicle mileage is more than the mileage limit (such as 20000km) or the total fuel consumption is more than the fuel consumption limit (such as 8000L). And sending the SCR efficiency monitoring request when the three conditions or any one condition is met.
The SCR efficiency monitoring release conditions include: the collection value of the NOx sensor at the upstream and the downstream of the SCR is effective, the temperature at the upstream of the SCR is in a certain range (such as 220-280 ℃), the concentration of the NOx at the upstream of the SCR is in a certain range (such as 50-1500 ppm) and the mass flow of the exhaust gas is in a certain range (such as 350-1600 Kg/h). And when the conditions are met, the SCR efficiency monitoring request is released.
Further, if the number of times that the efficiency monitoring cannot be released reaches the limit value (for example, 5 times) in the cooling stage, the reduction rate of the exhaust temperature can be reduced by adopting thermal management means such as adjusting the engine speed and the exhaust throttle valve, so that the normal release of the efficiency monitoring is ensured.
As shown in fig. 3, another aspect of the present invention further provides an apparatus for monitoring SCR conversion efficiency, which is used for executing the method for monitoring SCR conversion efficiency, and includes a data receiving module, a monitoring condition determining module, an integrating module, an efficiency calculating module, and a fault determining module.
And the data receiving module is used for receiving and processing signals sent by an engine ECU and an NOx sensor.
And the monitoring condition judgment module is used for calculating the received data and judging whether the working condition of the engine can carry out efficiency monitoring or not.
The integration module is used for integrating the NOx mass flow rate at the upstream of the SCR and the NOx mass flow rate at the downstream of the SCR.
And the efficiency calculation module is used for calculating the conversion efficiency through the integrated quality value.
And the fault judgment module is used for judging the magnitude of the fourth limit value and the actual value of the conversion efficiency so as to report a fault.
The invention also provides a system for monitoring the SCR conversion efficiency, which comprises a memory and a device for monitoring the SCR conversion efficiency, wherein the memory is stored with a method for monitoring the SCR conversion efficiency.
In actual operation, the data receiving module judges that when the carbon load of the DPF is higher than a limit value (such as 4g/L), the vehicle is alarmed to stop at a proper place, and a DPF parking regeneration switch is pressed to enter a normal parking regeneration process. The data receiving module obtains the carbon loading of the DPF when the carbon loading is lower than a second limit value (such as 0.3g/L) and enters a cooling stage. And the monitoring condition judgment module judges that the SCR efficiency monitoring request condition is met and the SCR efficiency monitoring release condition is met when the upstream temperature of the SCR is less than a third limit value (such as 280 ℃) in the cooling stage, and enters an SCR efficiency monitoring window.
At the moment, the integration module starts to integrate the mass flow of the NOx upstream of the SCR and the mass flow of the NOx downstream of the SCR in an SCR efficiency monitoring window, and when the mass flow integral value of the NOx upstream of the SCR reaches a limit value (such as 10g), the SCR conversion efficiency is calculated through the efficiency calculation module.
When the calculated SCR conversion efficiency is lower than a limit value (such as 75%), a fault is judged and reported through a fault judgment module, otherwise, the SCR conversion efficiency is normal if no fault exists.
In conclusion, according to the method for monitoring the SCR conversion efficiency provided by the invention, the normal work of the SCR can be ensured by effectively utilizing the parking regeneration process for the vehicle, and the SCR efficiency monitoring execution rate is improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method of monitoring SCR conversion efficiency, characterized by: comprises that
Pressing a DPF parking regeneration switch to enter a normal parking regeneration process when the carbon loading of the DPF is higher than a seventh limit value;
acquiring the temperature of the DPF upstream;
acquiring the carbon loading of the DPF according to the condition that the upstream temperature of the DPF is greater than a first limit value;
acquiring the upstream temperature of the SCR according to the condition that the carbon loading of the DPF is less than a second limit value;
entering an SCR efficiency monitoring window according to the condition that the SCR upstream temperature is smaller than a third limit value, the SCR efficiency monitoring request condition is met and the SCR efficiency monitoring release condition is met;
integrating the NOx mass flow at the upstream of the SCR and the NOx mass flow at the downstream of the SCR according to the SCR efficiency monitoring window, and calculating the SCR conversion efficiency;
and reporting the fault of low SCR conversion efficiency according to the condition that the SCR conversion efficiency is lower than a fourth limit value.
2. The method of monitoring SCR conversion efficiency according to claim 1, characterized in that: the SCR efficiency monitoring request condition comprises at least one of the condition that the running time of the engine is greater than a running time limit value, the running mileage of the vehicle is greater than a running mileage limit value or the total fuel consumption is greater than a fuel consumption limit value.
3. The method of monitoring SCR conversion efficiency according to claim 1, characterized in that: the SCR efficiency monitoring release conditions comprise that the collected values of the NOx sensors at the upstream and the downstream of the SCR are effective, the temperature at the upstream of the SCR is in the range of 280 ℃ of 220-.
4. The method of monitoring SCR conversion efficiency according to claim 1, characterized in that: and calculating the SCR conversion efficiency according to the condition that the mass flow integral of the NOx at the upstream of the SCR is higher than a fifth limit value.
5. Method of monitoring the SCR conversion efficiency according to claim 4, characterized in that: and when the SCR upstream NOx mass flow integral does not reach the fifth limit value and the SCR upstream temperature is lower than a sixth limit value, the SCR efficiency monitoring is stopped.
6. The method of monitoring SCR conversion efficiency according to claim 1, characterized in that: measuring the SCR upstream NOx mass flow and the SCR downstream NOx mass flow according to a NOx sensor.
7. An apparatus for monitoring SCR conversion efficiency for performing a method of monitoring SCR conversion efficiency according to any one of claims 1 to 6, characterized in that: the system comprises a data receiving module, a monitoring condition judging module, an integrating module, an efficiency calculating module and a fault judging module;
the data receiving module is used for receiving and processing signals sent by an engine ECU and an NOx sensor;
the monitoring condition judging module is used for calculating the received data and judging whether the working condition of the engine can carry out efficiency monitoring or not;
the integration module is used for integrating the NOx mass flow at the upstream part of the SCR and the NOx mass flow at the downstream part of the SCR;
the efficiency calculation module is used for calculating the conversion efficiency through the integrated quality value;
and the fault judgment module is used for judging the magnitude of the fourth limit value and the actual value of the conversion efficiency so as to report a fault.
8. A system for monitoring SCR conversion efficiency, comprising: the system for monitoring SCR conversion efficiency comprises a memory in which the method for monitoring SCR conversion efficiency according to any one of claims 1 to 6 is stored, and a device for monitoring SCR conversion efficiency according to claim 7.
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| CN113153502B (en) * | 2021-04-26 | 2022-04-05 | 潍柴动力股份有限公司 | Fault determination method and fault determination system for engine SCR carrier and engine |
| CN114592950A (en) * | 2022-02-24 | 2022-06-07 | 上海和夏骏智科技有限公司 | SCR (Selective catalytic reduction) failure active treatment method based on DPF active regeneration and SCR failure control device |
| CN116771474B (en) * | 2023-08-25 | 2023-11-17 | 潍柴动力股份有限公司 | Active regeneration control method and device, electronic equipment and readable storage medium |
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| CN110761881A (en) * | 2019-09-20 | 2020-02-07 | 东风商用车有限公司 | SCR efficiency diagnosis method |
| CN110848010A (en) * | 2019-11-29 | 2020-02-28 | 潍柴动力股份有限公司 | Exhaust temperature control system and control method |
| CN110985174A (en) * | 2019-12-17 | 2020-04-10 | 凯龙高科技股份有限公司 | SCR system conversion efficiency monitoring system and method |
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