CN115199388A - Method and device for detecting catalytic conversion efficiency of vehicle catalyst and vehicle - Google Patents
Method and device for detecting catalytic conversion efficiency of vehicle catalyst and vehicle Download PDFInfo
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- CN115199388A CN115199388A CN202110378912.2A CN202110378912A CN115199388A CN 115199388 A CN115199388 A CN 115199388A CN 202110378912 A CN202110378912 A CN 202110378912A CN 115199388 A CN115199388 A CN 115199388A
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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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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The application discloses a method and a device for detecting catalytic conversion efficiency of a vehicle catalyst and a vehicle, wherein the method comprises the following steps: acquiring exhaust emission data before catalysis and exhaust emission data after catalysis of a plurality of acquisition points when an engine operates according to an emission curve; calculating the catalytic conversion efficiency of each acquisition point according to the ratio of the exhaust emission data before catalysis to the exhaust emission data after catalysis; and carrying out weighted average on the catalytic efficiency of all the collection points, and calculating to obtain the weighted average catalytic conversion efficiency of the vehicle catalyst so as to judge that the vehicle catalyst is qualified when the weighted average catalytic conversion is greater than a qualified threshold value. Therefore, the problems that the catalytic conversion efficiency of a catalytic converter carried on a vehicle cannot be detected at present, the catalytic converter detection efficiency is low and the like are solved.
Description
Technical Field
The application relates to the technical field of vehicles, in particular to a method and a device for detecting catalytic conversion efficiency of a vehicle catalyst and a vehicle.
Background
At present, in order to meet the requirement of production consistency guarantee of vehicles for engine emission in order to meet emission regulations, a catalyst is generally added on the vehicles to perform catalytic treatment on tail gas so as to reduce pollution of the tail gas to the atmospheric environment.
However, in the process of checking the production consistency, the catalytic conversion efficiency of the catalyst mounted on the vehicle cannot be detected, so that once the emission exceeds the standard, whether the catalytic conversion efficiency of the catalyst is unqualified or not cannot be quickly determined, and the detection efficiency is greatly reduced.
Content of application
The application provides a catalytic conversion efficiency detection method and device of a vehicle catalyst and a vehicle, and aims to solve the problems that the catalytic conversion efficiency of a catalyst carried on the vehicle cannot be detected at present, so that the detection efficiency of the catalyst is low and the like.
An embodiment of the first aspect of the application provides a method for detecting catalytic conversion efficiency of a vehicle catalyst, which includes the following steps: acquiring exhaust emission data before catalysis and exhaust emission data after catalysis of a plurality of acquisition points when an engine operates according to an emission curve; calculating the catalytic conversion efficiency of each acquisition point according to the ratio of the exhaust emission data before catalysis to the exhaust emission data after catalysis; and carrying out weighted average on the catalytic efficiency of all the collection points, calculating to obtain the weighted average catalytic conversion efficiency of the vehicle catalyst, and judging that the vehicle catalyst is qualified when the weighted average catalytic conversion is greater than a qualified threshold value.
Further, before collecting the exhaust emission data of a plurality of collection points when the engine operates according to the emission curve, the method further comprises the following steps: determining a plurality of working condition points according to the rotating speed and the load of the engine, and dividing all the working condition points into a plurality of working condition intervals; dividing the rotating speed of the engine into a plurality of rotating speed intervals, and selecting a working condition interval meeting the number of preset working condition points in the rotating speed intervals as a high-probability working condition interval; and taking the central working condition point of the high-probability working condition interval as the plurality of acquisition points, and drawing the discharge curve according to the rotating speed and the load of all the central working condition points.
Further, the drawing the emission curve according to the rotating speed and the load of all the central working condition points comprises the following steps: determining a vehicle speed of the center operating point based on the rotation speed and the load; and running for a preset time according to the speed of the central working condition point, and drawing the discharge curve according to the running results corresponding to all the central working condition points.
Further, the calculation formula of the weighted average catalytic conversion efficiency is as follows:
wherein n is the number of collection points and the catalytic conversion efficiency i As the catalytic efficiency of the i-th collection point, a weighting factor i The weighting factor of the ith acquisition point.
Further, still include: generating a fail report based on the weighted average catalytic conversion efficiency of the vehicle catalyst when the weighted average catalytic conversion efficiency is less than or equal to the pass threshold.
An embodiment of a second aspect of the present application provides a catalytic conversion efficiency detection apparatus of a vehicle catalyst, including: the acquisition module is used for acquiring exhaust emission data before catalysis and exhaust emission data after catalysis of a plurality of acquisition points when the engine operates according to an emission curve; the calculation module is used for calculating the catalytic conversion efficiency of each acquisition point according to the ratio of the pre-catalytic exhaust emission data to the post-catalytic exhaust emission data; and the judging module is used for carrying out weighted average on the catalytic efficiency of all the collection points, calculating to obtain the weighted average catalytic conversion efficiency of the vehicle catalyst, and judging that the vehicle catalyst is qualified when the weighted average catalytic conversion is larger than a qualified threshold value.
Further, the method also comprises the following steps: the device comprises a setting module, a judging module and a judging module, wherein the setting module is used for determining a plurality of working condition points according to the rotating speed and the load of an engine before acquiring the tail gas emission data of a plurality of acquisition points when the engine runs according to an emission curve, and dividing all the working condition points into a plurality of working condition intervals; dividing the rotating speed of the engine into a plurality of rotating speed intervals, and selecting a working condition interval meeting the number of preset working condition points in the rotating speed intervals as a high-probability working condition interval; and taking the central working condition point of the high-probability working condition interval as the plurality of acquisition points, and drawing the discharge curve according to the rotating speed and the load of all the central working condition points.
Further, the setting module is further configured to determine a vehicle speed of the center operating point based on the speed and the load; and running for a preset time according to the speed of the central working condition point, and drawing the discharge curve according to the running results corresponding to all the central working condition points.
Further, the calculation formula of the weighted average catalytic conversion efficiency is as follows:
wherein n is the number of collection points and the catalytic conversion efficiency i As the catalytic efficiency of the i-th collection point, a weighting factor i The weighting factor for the ith acquisition point.
Further, the method also comprises the following steps: a generation module to generate a fail report based on the weighted average catalytic conversion efficiency of the vehicle catalyst when the weighted average catalytic conversion efficiency is less than or equal to the pass threshold.
An embodiment of a third aspect of the present application provides a vehicle including a catalytic conversion efficiency detection device of a vehicle catalyst as described in the above embodiment.
The catalytic conversion efficiency of the collection points is obtained through calculation of the exhaust emission data before and after catalysis, the weighted average catalytic conversion efficiency of the vehicle catalyst is calculated according to the catalytic efficiency of all the collection points, the catalytic conversion efficiency of the catalyst is determined, and the vehicle catalyst is judged to be qualified when the catalytic conversion efficiency is larger than a qualified threshold value, so that the catalytic conversion efficiency can be determined quickly and accurately according to the exhaust emission data before and after catalysis, the catalytic conversion efficiency of the catalyst can be detected quickly by a finished automobile manufacturing enterprise in a production stage under the finished automobile environment, and the detection efficiency is effectively improved. Therefore, the problem that the catalytic conversion efficiency of a catalyst carried on a vehicle cannot be detected at present, and the detection efficiency of the catalyst is low is solved.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a method for detecting catalytic conversion efficiency of a vehicle catalyst according to an embodiment of the application;
FIG. 2 is a flow chart of a method for detecting catalytic conversion efficiency of a vehicle catalyst according to one embodiment of the present application;
FIG. 3 is a schematic diagram illustrating high probability operating condition interval selection provided according to an embodiment of the present application
FIG. 4 is a schematic view of a discharge curve provided according to an embodiment of the present application;
FIG. 5 is a schematic illustration of a catalyst adapted for a specific emission profile adapted for retrofitting provided in accordance with an embodiment of the present application;
fig. 6 is an example diagram of a catalytic conversion efficiency detection device of a vehicle catalyst according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The following describes a method and device for detecting catalytic conversion efficiency of a vehicle catalyst, and a vehicle according to an embodiment of the present application, with reference to the drawings. In order to solve the problem that the catalytic conversion efficiency of a catalyst carried on a vehicle cannot be detected at present and the detection efficiency of the catalyst is low, the application provides a catalytic conversion efficiency detection method of a vehicle catalyst. Therefore, the problems that the catalytic conversion efficiency of a catalytic converter carried on a vehicle cannot be detected at present, the catalytic converter detection efficiency is low and the like are solved.
Specifically, fig. 1 is a schematic flow chart of a method for detecting catalytic conversion efficiency of a vehicle catalyst according to an embodiment of the present application.
As shown in fig. 1, the method for detecting the catalytic conversion efficiency of a vehicle catalyst includes the steps of:
in step S101, pre-catalytic exhaust emission data and post-catalytic exhaust emission data of a plurality of collection points are collected when the engine operates according to an emission curve.
It is noted that the execution subject of the catalytic conversion efficiency detection method of the vehicle catalyst may be a vehicle. The method for detecting the catalytic conversion efficiency of the vehicle catalyst according to the embodiment of the present application may be executed by the device for detecting the catalytic conversion efficiency of the vehicle catalyst according to the embodiment of the present application, and the device for detecting the catalytic conversion efficiency of the vehicle catalyst according to the embodiment of the present application may be configured in any vehicle to execute the method for detecting the catalytic conversion efficiency of the vehicle catalyst according to the embodiment of the present application.
The emission curve is used for detecting the catalytic conversion efficiency of the vehicle catalyst, and an emission test can be carried out based on the emission curve to acquire emission data. For example, the embodiment of the application can modify the catalyst into a catalyst suitable for an emission curve, install the catalyst on a vehicle, and perform an emission test on an engine emission rotating hub according to the emission curve so as to acquire exhaust emission data before and after the catalyst is catalyzed. And in order to ensure the reliability of the acquired data, data acquisition can be performed for a preset number of times, for example, the data acquisition can be repeated for 2 to 3 times.
In some embodiments, before collecting exhaust emission data for a plurality of collection points when the engine operates according to the emission curve, the method further comprises: determining a plurality of working condition points according to the rotating speed and the load of the engine, and dividing all the working condition points into a plurality of working condition intervals; dividing the rotating speed of the engine into a plurality of rotating speed intervals, and selecting a working condition interval meeting the number of preset working condition points in the rotating speed intervals as a high-probability working condition interval; and taking the central working condition point of the high-probability working condition interval as a plurality of acquisition points, and drawing an emission curve according to the rotating speed and the load of all the central working condition points.
The number of the preset operating points may be set according to an actual situation, for example, 3, and is not specifically limited herein.
It can be understood that the high-probability working condition interval can be selected through the emission cycle, and the corresponding emission curve is formulated based on the central working condition point of the high-probability working condition interval. Wherein, the discharge cycle means: the rotating speed load distribution condition of the whole cycle engine is obtained through a real vehicle test in a research and development stage, and data that the temperature of the cooling liquid is smaller than a preset temperature, such as 80 ℃, are rejected, so that a high-probability working condition interval of engine operation can be obtained.
As an example, the high probability operating condition interval is selected as follows:
(1) Dividing a working condition interval based on different rotating speeds +/-100 rpm and different loads +/-10 N.m, and counting the number of working condition points;
(2) Dividing the rotating speed into a low rotating speed area, a medium rotating speed area, a high rotating speed area and an ultrahigh rotating speed area;
(3) In the same rotating speed area, based on the sequencing of the number of working condition points in the working condition interval from high to low, selecting the first 1-3 working conditions as the working condition interval to be selected;
(4) Based on the selected candidate working condition intervals, finally determining 8 candidate working condition intervals as high-probability working condition intervals according to the principle of covering all rotating speed areas;
(5) The number of high probability operating condition intervals is not limited to 8.
In this embodiment, the emission curves are plotted according to the speed and load at all the center operating points, including: determining the vehicle speed of the central working condition point based on the rotating speed and the load; and running for a preset time according to the speed of the central working condition point, and drawing an emission curve according to the running results corresponding to all the central working condition points.
It can be understood that, in the embodiment of the application, based on the selected central operating point of the high-probability operating range, the stable speed and the stable gear of the whole vehicle at the operating point are determined through the rotating speed and the load, the vehicle speeds are ranked from low to high, and the whole vehicle is guaranteed to run at the corresponding vehicle speed for no less than a preset time, such as 120 seconds, so as to work out the emission curve. The preset time may be set according to actual conditions, and is only used as an example and is not specifically limited.
In step S102, the catalytic conversion efficiency at each collection point is calculated from the ratio between the pre-catalytic exhaust emission data and the post-catalytic exhaust emission data.
It can be understood that after the acquisition is completed, the engine exhaust pollutant data at the front end and the rear end of the catalyst can be obtained, so that the catalytic conversion efficiency of the catalyst in different high-probability working condition intervals can be calculated based on the sampling data.
In this example, the catalytic conversion efficiency at the collection point was:
wherein, the gas taking point 1 i Gas point 2 is the exhaust emission data before catalysis of the ith acquisition point i And the data is the exhaust emission data after the catalysis of the ith acquisition point.
In step S103, the catalytic efficiencies at all the collection points are weighted-averaged, and the weighted-average catalytic conversion efficiency of the vehicle catalyst is calculated, so that when the weighted-average catalytic conversion is greater than the pass threshold, it is determined that the vehicle catalyst is pass.
The qualified threshold may be set according to an actual situation, for example, may be set to 99%, and when the weighted average catalytic conversion efficiency of the catalyst is greater than 99%, it is determined that the catalytic conversion efficiency of the catalyst is qualified.
The embodiment of the application can calculate the final weighted average catalytic conversion efficiency of the catalytic converter based on the catalytic conversion efficiency and the weighting factor of different high-probability working condition intervals, wherein the calculation formula of the weighted average catalytic conversion efficiency is as follows:
wherein n is the number of collection points and the catalytic conversion efficiency i As the catalytic efficiency of the i-th collection point, a weighting factor i The weighting factor for the ith acquisition point.
In some embodiments, further comprising: an off-spec report is generated based on the weighted average catalytic conversion efficiency of the vehicle catalyst when the weighted average catalytic conversion efficiency is less than or equal to an acceptable threshold.
It is understood that the embodiment of the application can obtain the final weighted average catalytic conversion efficiency of the catalyst and complete the evaluation based on the weighted algorithm, and can generate a fail report when the catalytic conversion efficiency of the vehicle catalyst is failed, wherein the fail report comprises the catalytic conversion efficiency data of the vehicle catalyst.
The method for detecting the catalytic conversion efficiency of the vehicle catalyst will be further described by an embodiment, as shown in fig. 2, and specifically includes the following steps:
1. extracting a high-probability working condition interval of the whole vehicle emission cycle (rotating speed/load) engine operation; FIG. 3 is a working condition scatter diagram of a whole vehicle WLTC discharge cycle based on rotating speed and load, and data of the temperature of the cooling liquid smaller than 80 ℃ are removed. In fig. 3, the rectangular frame is 8 selected high-probability operating condition intervals, and the selection principle is as follows:
(1) Based on different rotating speeds +/-100 rpm and different loads +/-10 N.m, dividing a working condition interval, and counting the number of working condition points.
(2) The working condition scatter diagram is divided into a low rotating speed area (the rotating speed is less than 2000 rpm), a medium rotating speed area (the rotating speed is less than or equal to 2000rpm and less than 3000 rpm), a high rotating speed area (the rotating speed is less than or equal to 3000rpm and less than 4000 rpm) and an ultrahigh rotating speed area (the rotating speed is more than or equal to 4000 rpm) according to the rotating speed.
(3) And in the low rotating speed area, the first 1-3 intervals are selected as the working condition intervals to be selected based on the number of the working condition points in the working condition intervals from high to low. In the interval shown by the number 1 in FIG. 3, the rotation speed is 1600 + -100 rpm, and the load is 20 + -10 N.m; interval shown by number 2, rotation speed 1600 + -100 rpm, load 60 + -10 N.m.
(4) And in the middle rotating speed area, the first 1-3 intervals are selected as the working condition intervals to be selected based on the number of the working condition points in the working condition intervals from high to low. In the interval shown by the number 3 in FIG. 3, the rotation speed is 2400. + -.100 rpm, and the load is 40. + -.10 N.m; the interval shown by the number 4, the rotation speed 2400. + -.100 rpm, and the load 100. + -.10N · m.
(5) And in the high rotating speed area, the first 1-3 intervals are selected as the working condition intervals to be selected based on the number of the working condition points in the working condition intervals from high to low. In the interval shown by the number 5 in FIG. 3, the rotation speed is 3000 + -100 rpm, and the load is 100 + -10 N.m; the interval shown by number 6, rotation speed 3400. + -.100 rpm, load 160. + -.10 N.m.
(6) And in the ultrahigh rotating speed area, the first 1-3 intervals are selected as the working condition intervals to be selected based on the number of the working condition points in the working condition intervals from high to low. In the interval shown by the number 7 in FIG. 3, the rotating speed is 3800 + -100 rpm, and the load is 130 + -10 N.m; the interval shown by number 8, the rotation speed 4000. + -.100 rpm, and the load 100. + -.10 Nm.
As shown in the graph 1, based on the selected candidate working condition intervals, 8 candidate working condition intervals are finally determined as high-probability working condition intervals according to the principle of covering all the rotating speed areas. And the number of the working points of the different sequence number intervals is used as the weighting factor of the sequence number interval.
TABLE 1
2. Special emission curve is formulated based on central working condition point of high-probability working condition interval
After the high-probability working condition interval is determined, the stable speed and the gear of the whole vehicle at the working condition point are obtained based on the rotating speed and the load of the central working condition point of the high-probability working condition interval, and the stable speed and the gear are shown in the table 1. The vehicle speeds are sequenced from low to high and divided into two groups of working condition points of low vehicle speed and high vehicle speed, the whole vehicle is guaranteed to run for 120 seconds at the corresponding vehicle speed, the vehicle speed between the working condition points is excessively separated for 12 seconds, the idling time is 20 seconds and 1100 seconds, and a special emission curve is worked out, as shown in fig. 4.
3. Reforming catalyst suitable for special emission curve
Meanwhile, the catalyst is modified, as shown in fig. 5, air taking holes are arranged in the front and the back of the catalyst, the aperture of the air taking hole and the size of an extension pipe of the air taking hole are formulated based on the requirements of emission equipment, and the air taking hole is used for collecting the data of the pollutants in the tail gas of the engine, namely collecting the emission data before and after catalysis.
4. Carrying out emission test based on special emission curve and collecting emission data
After the complete heat engine of the whole vehicle (the temperature of the cooling liquid is more than 80 ℃), a special emission curve is operated, and the data of the pollutants in the tail gas of the engine are respectively collected from a gas taking point 1 and a gas taking point 2 in the graph 5 through emission equipment.
5. Calculating weighted average catalytic conversion efficiency of catalyst based on sampled data
Calculating the weighted average catalytic conversion efficiency of the catalyst based on the collected engine exhaust pollutant data of the gas taking points of the working condition points, wherein the catalytic conversion efficiency of each working condition point is as follows:
weighted average catalytic conversion efficiency of catalyst:
6. and judging whether the weighted average catalytic conversion efficiency of the catalyst is qualified or not.
And judging whether the catalytic conversion efficiency of the catalyst is qualified or not based on whether the weighted average catalytic conversion efficiency of the catalyst obtained by the calculation is greater than 99%.
According to the catalytic conversion efficiency detection method of the vehicle catalyst, catalytic conversion efficiency of the collection points is obtained through calculation of exhaust emission data before and after catalysis, weighted average catalytic conversion efficiency of the vehicle catalyst is calculated according to the catalytic efficiency of all the collection points, catalytic conversion efficiency of the catalyst is determined, and the vehicle catalyst is judged to be qualified when the catalytic conversion efficiency is larger than a qualified threshold value, so that the catalytic conversion efficiency can be rapidly and accurately determined according to the exhaust emission data before and after catalysis, catalytic conversion efficiency of the catalyst can be rapidly detected in a finished vehicle environment in a production stage of a finished vehicle manufacturing enterprise, and detection efficiency is effectively improved.
Next, a catalytic conversion efficiency detection device of a vehicle catalyst proposed according to an embodiment of the present application is described with reference to the drawings.
Fig. 6 is a block diagram schematically illustrating a catalytic conversion efficiency detection device of a vehicle catalyst according to an embodiment of the present application.
As shown in fig. 6, the catalytic conversion efficiency detection device 10 of the vehicle catalyst includes: an acquisition module 100, a calculation module 200 and a decision module 300.
The acquisition module 100 is used for acquiring pre-catalytic exhaust emission data and post-catalytic exhaust emission data of a plurality of acquisition points when the engine operates according to an emission curve; the calculation module 200 is configured to calculate the catalytic conversion efficiency at each collection point according to a ratio between the pre-catalytic exhaust emission data and the post-catalytic exhaust emission data; the determination module 300 is configured to perform weighted average on the catalytic efficiencies at all the collection points, and calculate a weighted average catalytic conversion efficiency of the vehicle catalyst, so as to determine that the vehicle catalyst is qualified when the weighted average catalytic conversion is greater than a qualified threshold.
Further, the apparatus 10 of the embodiment of the present application further includes: and setting a module. The device comprises a setting module, a control module and a control module, wherein the setting module is used for determining a plurality of working condition points according to the rotating speed and the load of an engine before acquiring the exhaust emission data of a plurality of acquisition points when the engine runs according to an emission curve, and dividing all the working condition points into a plurality of working condition intervals; dividing the rotating speed of the engine into a plurality of rotating speed intervals, and selecting a working condition interval meeting the number of preset working condition points in the rotating speed intervals as a high-probability working condition interval; and taking the central working condition point of the high-probability working condition interval as a plurality of acquisition points, and drawing an emission curve according to the rotating speed and the load of all the central working condition points.
Further, the setting module is further used for determining the vehicle speed of the central working condition point based on the rotating speed and the load; and running for a preset time according to the speed of the central working condition point, and drawing an emission curve according to the running results corresponding to all the central working condition points.
Further, the formula for calculating the weighted average catalytic conversion efficiency is:
wherein n is the number of collection points and the catalytic conversion efficiency i As the catalytic efficiency of the i-th collection point, a weighting factor i Is the weighting factor of the ith operating point.
Further, the apparatus 10 of the embodiment of the present application further includes: and generating a module. The generation module is used for generating an unqualified report based on the weighted average catalytic conversion efficiency of the vehicle catalyst when the weighted average catalytic conversion efficiency is smaller than or equal to a qualified threshold value.
It should be noted that the foregoing explanation of the embodiment of the method for detecting catalytic conversion efficiency of a vehicle catalyst is also applicable to the device for detecting catalytic conversion efficiency of a vehicle catalyst of this embodiment, and will not be repeated herein.
According to the catalytic conversion efficiency detection device of the vehicle catalyst, catalytic conversion efficiency of the collection point is obtained through calculation of exhaust emission data before and after catalysis, weighted average catalytic conversion efficiency of the vehicle catalyst is calculated according to catalytic efficiency of all the collection points, catalytic conversion efficiency of the catalyst is determined, and the vehicle catalyst is judged to be qualified when the catalytic conversion efficiency is larger than a qualified threshold value, catalytic conversion efficiency can be determined quickly and accurately according to the exhaust emission data before and after catalysis, catalytic conversion efficiency of the catalyst can be detected quickly by a finished vehicle manufacturing enterprise under a finished vehicle environment in a production stage, and detection efficiency is effectively improved.
In addition, the embodiment of the application also provides a vehicle, and the vehicle comprises the catalytic conversion efficiency detection device of the vehicle catalyst. According to the vehicle provided by the embodiment of the application, the catalytic conversion efficiency of the collection point is obtained through calculation of the exhaust emission data before and after catalysis, the weighted average catalytic conversion efficiency of the vehicle catalyst is calculated according to the catalytic efficiency of all the collection points, the catalytic conversion efficiency of the catalyst is determined, and the vehicle catalyst is judged to be qualified when the catalytic conversion efficiency is greater than a qualified threshold value, so that the catalytic conversion efficiency can be rapidly and accurately determined according to the exhaust emission data before and after catalysis, the catalytic conversion efficiency of the catalyst can be rapidly detected in the whole vehicle environment in the production stage of a whole vehicle manufacturing enterprise, and the detection efficiency is effectively improved.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "N" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of implementing the embodiments of the present application.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or N wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are well known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A method for detecting catalytic conversion efficiency of a vehicle catalyst, characterized by comprising the steps of:
acquiring exhaust emission data before catalysis and exhaust emission data after catalysis of a plurality of acquisition points when an engine operates according to an emission curve;
calculating the catalytic conversion efficiency of each acquisition point according to the ratio of the exhaust emission data before catalysis to the exhaust emission data after catalysis; and
and carrying out weighted average on the catalytic efficiency of all the collection points, calculating to obtain the weighted average catalytic conversion efficiency of the vehicle catalyst, and judging that the vehicle catalyst is qualified when the weighted average catalytic conversion is greater than a qualified threshold value.
2. The method of claim 1, further comprising, prior to collecting exhaust emission data for a plurality of collection points at which the engine operates according to an emission profile:
determining a plurality of working condition points according to the rotating speed and the load of the engine, and dividing all the working condition points into a plurality of working condition intervals;
dividing the rotating speed of the engine into a plurality of rotating speed intervals, and selecting a working condition interval meeting the number of preset working condition points in the rotating speed intervals as a high-probability working condition interval;
and taking the central working condition point of the high-probability working condition interval as the plurality of acquisition points, and drawing the discharge curve according to the rotating speed and the load of all the central working condition points.
3. The method of claim 2, wherein said plotting said emission curve as a function of speed and load at all center operating points comprises:
determining a vehicle speed of the center operating point based on the rotation speed and the load;
and operating for a preset time according to the vehicle speed of the central working condition point, and drawing the discharge curve according to the operation results corresponding to all the central working condition points.
4. The method of claim 1, wherein the weighted average catalytic conversion efficiency is calculated by:
wherein n is the number of collection points and the catalytic conversion efficiency i As the catalytic efficiency of the i-th collection point, a weighting factor i The weighting factor of the ith acquisition point.
5. The method of claim 1, further comprising:
generating an off-spec report based on the weighted average catalytic conversion efficiency of the vehicle catalyst when the weighted average catalytic conversion efficiency is less than or equal to the pass threshold.
6. A catalytic conversion efficiency detection device of a vehicle catalyst, characterized by comprising:
the acquisition module is used for acquiring exhaust emission data before catalysis and exhaust emission data after catalysis of a plurality of acquisition points when the engine operates according to an emission curve;
the calculation module is used for calculating the catalytic conversion efficiency of each acquisition point according to the ratio of the exhaust emission data before catalysis to the exhaust emission data after catalysis; and
and the judging module is used for carrying out weighted average on the catalytic efficiency of all the collection points, calculating to obtain the weighted average catalytic conversion efficiency of the vehicle catalyst, and judging that the vehicle catalyst is qualified when the weighted average catalytic conversion is larger than a qualified threshold value.
7. The apparatus of claim 6, further comprising:
the device comprises a setting module, a judging module and a judging module, wherein the setting module is used for determining a plurality of working condition points according to the rotating speed and the load of an engine before acquiring the tail gas emission data of a plurality of acquisition points when the engine runs according to an emission curve, and dividing all the working condition points into a plurality of working condition intervals; dividing the rotating speed of the engine into a plurality of rotating speed intervals, and selecting a working condition interval meeting the number of preset working condition points in the rotating speed intervals as a high-probability working condition interval; taking the central working condition point of the high-probability working condition interval as the plurality of acquisition points, and drawing the discharge curve according to the rotating speed and the load of all the central working condition points;
the setting module is further used for determining the vehicle speed of the central working condition point based on the rotating speed and the load; and running for a preset time according to the speed of the central working condition point, and drawing the discharge curve according to the running results corresponding to all the central working condition points.
8. The apparatus of claim 6, wherein the weighted average catalytic conversion efficiency is calculated by:
wherein n is the number of collection points and the catalytic conversion efficiency i As the catalytic efficiency of the i-th collection point, a weighting factor i The weighting factor of the ith acquisition point.
9. The apparatus of claim 6, further comprising:
a generation module to generate an off-spec report based on the weighted average catalytic conversion efficiency of the vehicle catalyst when the weighted average catalytic conversion efficiency is less than or equal to the pass threshold.
10. A vehicle characterized by comprising the catalytic conversion efficiency detection device of the vehicle catalyst recited in any one of claims 6 to 9.
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