CN115199388B - 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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- CN115199388B CN115199388B CN202110378912.2A CN202110378912A CN115199388B CN 115199388 B CN115199388 B CN 115199388B CN 202110378912 A CN202110378912 A CN 202110378912A CN 115199388 B CN115199388 B CN 115199388B
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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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- 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
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: collecting pre-catalysis tail gas emission data and post-catalysis tail gas emission data of a plurality of collecting points when the engine operates according to an emission curve; calculating the catalytic conversion efficiency at each acquisition point according to the ratio between the pre-catalysis tail gas emission data and the post-catalysis tail gas emission data; and carrying out weighted average on the catalytic efficiency at all the acquisition 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 larger than a qualified threshold. Therefore, the problems that the catalytic conversion efficiency of the catalyst mounted on the vehicle cannot be detected at present, the detection efficiency of the catalyst 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 requirements of emission regulations on production consistency guarantee of engine emission, a catalyst is generally added on the vehicle to catalyze and treat the tail gas so as to reduce the pollution of the tail gas to the atmosphere.
However, in the process of production consistency inspection, since the catalytic conversion efficiency of the catalyst mounted on the vehicle cannot be detected, once the emission exceeds the standard, it cannot be quickly determined whether the detection efficiency is greatly reduced due to the disqualification of the catalytic conversion efficiency of the catalyst.
Content of the application
The application provides a method and a device for detecting catalytic conversion efficiency of a vehicle catalyst and a vehicle, and aims to solve the problems that the catalytic conversion efficiency of the 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 a first aspect of the present application provides a method for detecting catalytic conversion efficiency of a vehicle catalyst, including the steps of: collecting pre-catalysis tail gas emission data and post-catalysis tail gas emission data of a plurality of collecting points when the engine operates according to an emission curve; calculating the catalytic conversion efficiency at each acquisition point according to the ratio between the pre-catalysis tail gas emission data and the post-catalysis tail gas emission data; and carrying out weighted average on the catalytic efficiency at all the acquisition 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.
Further, before collecting the exhaust emission data of the 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 working condition intervals meeting the number of preset working condition points in the rotating speed intervals as high-probability working condition intervals; and taking the central working point of the high-probability working condition interval as the plurality of acquisition points, and drawing the emission curve according to the rotating speeds and the loads of all the central working points.
Further, the drawing the emission curve according to the rotation speed and the load of all the central working points includes: determining a vehicle speed of the center operating point based on the rotational speed and the load; and running for preset time according to the vehicle speed of the central working point, and drawing the emission curve according to the running results corresponding to all the central working points.
Further, the calculation formula of the weighted average catalytic conversion efficiency is as follows:
wherein n is the number of the acquisition points, and the catalytic conversion efficiency i For the catalytic efficiency of the ith acquisition point, weighting factor i Is the weighting factor for the i-th acquisition point.
Further, the method further comprises the following steps: generating a failure 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 device of a vehicle catalyst, including: the acquisition module is used for acquiring pre-catalysis tail gas emission data and post-catalysis tail gas emission data of a plurality of acquisition points when the engine runs according to an emission curve; the calculation module is used for calculating the catalytic conversion efficiency at each acquisition point according to the ratio between the pre-catalysis tail gas emission data and the post-catalysis tail gas emission data; and the judging module is used for carrying out weighted average on the catalytic efficiency at all the acquisition 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 qualification threshold value.
Further, the method further comprises the following steps: 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 collecting the exhaust emission data of a plurality of collecting points when the engine operates 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 working condition intervals meeting the number of preset working condition points in the rotating speed intervals as high-probability working condition intervals; and taking the central working point of the high-probability working condition interval as the plurality of acquisition points, and drawing the emission curve according to the rotating speeds and the loads of all the central working points.
Further, the setting module is further configured to determine a vehicle speed of the central operating point based on the rotational speed and the load; and running for preset time according to the vehicle speed of the central working point, and drawing the emission curve according to the running results corresponding to all the central working points.
Further, the calculation formula of the weighted average catalytic conversion efficiency is as follows:
wherein n is the number of the acquisition points, and the catalytic conversion efficiency i For the catalytic efficiency of the ith acquisition point, weighting factor i Is the weighting factor for the i-th acquisition point.
Further, the method further comprises the following steps: and the generation module is used for generating a disqualification 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 the qualification threshold.
An embodiment of a third aspect of the application provides a vehicle including the catalytic conversion efficiency detection device of the vehicle catalyst described in the above embodiment.
The catalytic conversion efficiency at the acquisition points is obtained through calculation of the exhaust emission data before and after catalysis, the weighted average catalytic conversion efficiency according to the vehicle catalytic converter is calculated according to the catalytic efficiency at all the acquisition points, so that the catalytic conversion efficiency of the catalytic converter is determined, and the vehicle catalytic converter is judged to be qualified when the catalytic conversion efficiency is larger than a qualified threshold, 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 catalytic converter can be rapidly detected in the whole vehicle environment by a whole vehicle manufacturing enterprise in the production stage, and the detection efficiency is effectively improved. Therefore, the problems that the catalytic conversion efficiency of the catalyst mounted on the vehicle cannot be detected at present, the detection efficiency of the catalyst is low and the like are solved.
Additional aspects and advantages of the 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 application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a flowchart of a method for detecting catalytic conversion efficiency of a vehicle catalyst according to an embodiment of the present application;
FIG. 2 is a flow chart of a method for detecting catalytic conversion efficiency of a vehicle catalyst according to an embodiment of the present application;
FIG. 3 is a schematic diagram illustrating a high probability operating mode interval selection according to an embodiment of the present application
FIG. 4 is a schematic view of an emission profile provided in accordance with an embodiment of the present application;
FIG. 5 is a schematic illustration of a catalyst adapted for use in a dedicated emission curve according to 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 application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
The method and apparatus for detecting the catalytic conversion efficiency of a vehicle catalyst and the vehicle according to the embodiments of the present application are described below with reference to the accompanying drawings. Aiming at 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 in the background art center, the application provides a method for detecting the catalytic conversion efficiency of the vehicle catalyst, in the method, the catalytic conversion efficiency at the acquisition points is calculated through 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 at all the acquisition points, so that 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, so that the catalytic conversion efficiency can be rapidly and accurately determined according to the exhaust emission data before and after catalysis, and 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. Therefore, the problems that the catalytic conversion efficiency of the catalyst mounted on the vehicle cannot be detected at present, the detection efficiency of the catalyst 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 the vehicle catalyst includes the steps of:
in step S101, pre-catalysis exhaust emission data and post-catalysis exhaust emission data of a plurality of collection points when the engine operates according to an emission curve are collected.
The main body of the method for detecting the catalytic conversion efficiency 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 application may be executed by the device for detecting the catalytic conversion efficiency of the vehicle catalyst according to the embodiment of the application, and the device for detecting the catalytic conversion efficiency of the vehicle catalyst according to the embodiment of the 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 application.
The emission curve is used for detecting the catalytic conversion efficiency of the vehicle catalyst, and the emission test can be performed 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, and install the catalyst on a vehicle, and perform an emission test on an engine emission hub according to the emission curve so as to collect exhaust emission data before and after the catalyst is catalyzed. And in order to ensure the reliability of the acquired data, the data acquisition can be performed for a preset number of times, for example, can be repeated for 2-3 times.
In some embodiments, prior to collecting the exhaust emission data for a plurality of collection points when the engine is operating according to the emission profile, further comprising: 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 point of the high-probability working condition interval as a plurality of acquisition points, and drawing an emission curve according to the rotating speeds and the loads of all the central working points.
The number of the preset operating points may be set according to actual situations, for example, 3, which is not specifically limited herein.
It can be appreciated that the embodiment of the application can select the high-probability working condition interval through the discharge cycle, and formulate the corresponding discharge curve based on the center working condition point of the high-probability working condition interval. Wherein the discharge cycle refers to: the real vehicle test in the research and development stage is used for obtaining the distribution condition of the rotating speed and the load of the whole circulating engine, and the data that the temperature of the cooling liquid is smaller than the preset temperature, such as 80 ℃ is removed, so that the high-probability working condition interval of the engine operation can be obtained.
As an example, the selection principle of the high probability operating mode interval is as follows:
(1) Dividing working condition intervals based on different rotating speeds of +/-100 rpm and different loads of +/-10 N.m, and counting the number of working condition points in the working condition intervals;
(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, selecting the first 1-3 working conditions as working condition intervals to be selected based on the sequence from high to low of the number of the working condition points in the working condition intervals;
(4) Based on the selected working condition intervals to be selected, finally determining 8 working condition intervals to be selected as high-probability working condition intervals according to the principle of covering all rotating speed areas;
(5) The number of high probability operating mode intervals is not limited to 8.
In this embodiment, the drawing of the emission curve according to the rotational speed and the load of all the center operating points includes: determining the speed of the central working point based on the rotation speed and the load; and running for a preset time according to the vehicle speed of the central working point, and drawing an emission curve according to the running results corresponding to all the central working points.
It can be understood that the embodiment of the application can determine the stable vehicle speed and gear of the whole vehicle under the working condition point through the rotating speed and the load based on the selected central working condition point of the high-probability working condition interval, and order the vehicle speed from low to high, so as to ensure that the operation of the whole vehicle at the corresponding vehicle speed is not lower than the preset time, such as 120 seconds, so as to make the emission curve. The preset time may be set according to actual situations, and is only used as an example and is not specifically limited herein.
In step S102, the catalytic conversion efficiency at each of the collection points 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 embodiment of the application can obtain the engine exhaust pollutant data at the front end and the rear end of the catalyst, 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 is:
wherein, get gas point 1 i Taking gas point 2 as the data of the emission of the tail gas before catalysis of the ith collection point i Is the data of the exhaust emission after catalysis of the ith collection 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 as to determine that the vehicle catalyst is acceptable when the weighted-average catalytic conversion is greater than the acceptable threshold.
The qualification threshold may be set according to practical situations, 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 catalyst based on the catalytic conversion efficiency and the weighting factors 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 the acquisition points, and the catalytic conversion efficiency i For the catalytic efficiency of the ith acquisition point, weighting factor i Is the weighting factor for the i-th acquisition point.
In some embodiments, further comprising: when the weighted average catalytic conversion efficiency is less than or equal to the pass threshold, a fail report is generated based on the weighted average catalytic conversion efficiency of the vehicle catalyst.
It will be appreciated that embodiments of the present application may be based on a weighted algorithm to obtain a final weighted average catalytic conversion efficiency of the vehicle catalyst and complete the evaluation, and may generate a failure report when the catalytic conversion efficiency of the vehicle catalyst fails, wherein the failure report includes 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 a specific embodiment, as shown in fig. 2, specifically comprising the steps of:
1. extracting a working condition interval of high probability of running of the whole vehicle emission cycle (rotating speed/load) engine; FIG. 3 is a plot of operating conditions based on speed and load for a complete vehicle WLTC emission cycle, eliminating data for coolant temperatures less than 80 ℃. The rectangular frame in fig. 3 is the 8 selected high probability working condition intervals, and the selection principle is as follows:
(1) Based on different rotational speeds of +/-100 rpm and different loads of +/-10 N.m, working condition intervals are divided, and the number of working condition points in the working condition intervals is counted.
(2) The operating mode scatter diagram is divided into a low-rotation speed region (the rotation speed is less than 2000 rpm), a medium-rotation speed region (the rotation speed is less than or equal to 2000rpm and less than 3000 rpm), a high-rotation speed region (the rotation speed is less than or equal to 3000rpm and less than 4000 rpm) and an ultrahigh-rotation speed region (the rotation speed is more than or equal to 4000 rpm) according to the rotation speed.
(3) And selecting the first 1-3 intervals as working condition intervals to be selected based on the number of working condition points in the working condition intervals from high to low in the low rotation speed area. As shown in the interval of the number 1 in FIG. 3, the rotating speed is 1600+/-100 rpm, and the load is 20+/-10 N.m; the interval shown in the number 2 has the rotating speed of 1600+/-100 rpm and the load of 60+/-10 N.m.
(4) And selecting the first 1-3 intervals as working condition intervals to be selected based on the number of working condition points in the working condition intervals from high to low in the middle rotating speed area. As shown in the interval of number 3 in FIG. 3, the rotation speed is 2400+ -100 rpm, and the load is 40+ -10 N.m; the interval shown in the number 4 has a rotation speed of 2400+ -100 rpm and a load of 100+ -10 N.m.
(5) And selecting the first 1-3 intervals as working condition intervals to be selected based on the number of working condition points in the working condition intervals from high to low in the high rotating speed area. As shown in the interval of number 5 in FIG. 3, the rotation speed is 3000+ -100 rpm, and the load is 100+ -10 N.m; in the interval shown in the number 6, the rotation speed is 3400+ -100 rpm, and the load is 160+ -10 N.m.
(6) And the ultrahigh rotating speed region is used for selecting the first 1-3 regions as working condition regions to be selected based on the condition points in the working condition regions from high to low. In the interval shown by the number 7 in FIG. 3, the rotation speed is 3800+ -100 rpm, and the load is 130+ -10 N.m; in the interval shown in the number 8, the rotation speed is 4000+ -100 rpm, and the load is 100+ -10 N.m.
As shown in fig. 1, based on the selected working condition intervals to be selected, 8 working condition intervals to be selected are finally determined as high-probability working condition intervals according to the principle of covering all the rotating speed areas. The number of the working points in different sequence number intervals is used as the weighting factor of the sequence number intervals.
TABLE 1
2. Setting a special emission curve based on a central working point of a high-probability working range
After the high-probability working condition interval is determined, the stable vehicle speed and gear of the whole vehicle under 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, as shown in table 1. The vehicle speed is sorted from low to high and is divided into two groups of working points of low vehicle speed and high vehicle speed, the whole vehicle is ensured to run for 120 seconds at the corresponding vehicle speed, the vehicle speed between the working points is excessively spaced for 12 seconds, the idling is performed for 20 seconds, and the total idling is performed for 1100 seconds, so that a special emission curve is prepared, and the special emission curve is shown in fig. 4.
3. Catalytic converter adapted for special emission curve
Meanwhile, the catalyst is modified, as shown in fig. 5, air taking holes are arranged in front of and behind the catalyst, the aperture of the air taking holes and the size of an extension pipe of the air taking holes are formulated based on the requirements of emission equipment, and the air taking holes are used for collecting engine tail gas pollutant data, namely collecting emission data before and after catalysis.
4. Emission test is carried out based on special emission curve, and emission data is collected
After the whole vehicle is completely heated (the temperature of the cooling liquid is more than 80 ℃), a special emission curve is operated, and engine tail gas pollutant data are respectively acquired from an air taking point 1 and an air taking point 2 in fig. 5 through emission equipment.
5. Calculating a weighted average catalytic conversion efficiency of a catalyst based on sampled data
Calculating weighted average catalytic conversion efficiency of the catalyst based on the collected engine exhaust pollutant data of the gas taking points of all the working points, wherein the catalytic conversion efficiency of all the working points is as follows:
weighted average catalytic conversion efficiency of the 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 calculation is greater than 99 percent.
According to the method for detecting the catalytic conversion efficiency of the vehicle catalyst, the catalytic conversion efficiency at the acquisition points is obtained through calculation of the exhaust emission data before and after catalysis, the weighted average catalytic conversion efficiency according to the vehicle catalyst is calculated according to the catalytic efficiency at all the acquisition points, so that 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 the qualified threshold, 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.
Next, a catalytic conversion efficiency detection apparatus for a vehicle catalyst according to an embodiment of the present application will be described with reference to the accompanying drawings.
Fig. 6 is a block diagram schematically showing a catalytic conversion efficiency detection apparatus 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: the system comprises an acquisition module 100, a calculation module 200 and a determination module 300.
The acquisition module 100 is used for acquiring pre-catalysis exhaust emission data and post-catalysis exhaust emission data of a plurality of acquisition points when the engine operates according to an emission curve; the calculation module 200 is used for calculating the catalytic conversion efficiency at each acquisition point according to the ratio between the pre-catalysis tail gas emission data and the post-catalysis tail gas 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 qualification threshold.
Further, the apparatus 10 according to the embodiment of the present application further includes: and setting a module. The setting module is used for determining a plurality of working condition points according to the rotating speed and the load of the engine before collecting the tail gas emission data of a plurality of collecting points when the engine operates 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 point of the high-probability working condition interval as a plurality of acquisition points, and drawing an emission curve according to the rotating speeds and the loads of all the central working points.
Further, the setting module is further used for determining the vehicle speed of the central working point based on the rotating speed and the load; and running for a preset time according to the vehicle speed of the central working point, and drawing an emission curve according to the running results corresponding to all the central working points.
Further, the calculation formula of the weighted average catalytic conversion efficiency is:
wherein n is the number of the acquisition points, and the catalytic conversion efficiency i For the catalytic efficiency of the ith acquisition point, weighting factor i Is the weighting factor of the i-th operating point.
Further, the apparatus 10 according to the embodiment of the present application further includes: and generating a module. The generation module is used for generating a failure 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 qualification threshold.
It should be noted that the foregoing explanation of the embodiment of the method for detecting the catalytic conversion efficiency of the vehicle catalyst is also applicable to the catalytic conversion efficiency detecting device of the vehicle catalyst of this embodiment, and will not be repeated here.
According to the catalytic conversion efficiency detection device for the vehicle catalyst, provided by the embodiment of the application, the catalytic conversion efficiency at the acquisition points is obtained through the calculation of the exhaust emission data before and after catalysis, the weighted average catalytic conversion efficiency according to the vehicle catalyst is calculated according to the catalytic efficiency at all the acquisition points, so that 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 the qualified threshold, 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 addition, the embodiment of the application also provides a vehicle, comprising 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 at the acquisition points is obtained through the calculation of the exhaust emission data before and after catalysis, the weighted average catalytic conversion efficiency according to the vehicle catalyst is calculated according to the catalytic efficiency at all the acquisition points, so that 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 the qualified threshold, 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 by a whole vehicle manufacturing enterprise in the production stage, and the detection efficiency is effectively improved.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," 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 present application. In this specification, schematic representations of the above terms are not necessarily directed 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, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, for example, two, three, etc., unless specifically defined 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 specific logical functions or steps of the process, and further 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 the embodiments of the present application.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing 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 cartridge (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). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may 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 is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described 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. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.
Claims (8)
1. The method for detecting the catalytic conversion efficiency of the vehicle catalyst is characterized by comprising the following steps of:
collecting pre-catalysis tail gas emission data and post-catalysis tail gas emission data of a plurality of collecting points when the engine operates according to an emission curve;
calculating the catalytic conversion efficiency at each acquisition point according to the ratio between the pre-catalysis tail gas emission data and the post-catalysis tail gas emission data; and
weighted average is carried out on the catalytic efficiency at all the acquisition points, and the weighted average catalytic conversion efficiency of the vehicle catalyst is obtained through calculation, so that the vehicle catalyst is judged to be qualified when the weighted average catalytic conversion efficiency is larger than a qualified threshold; before collecting the exhaust emission data of a plurality of collecting 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 working condition intervals meeting the number of preset working condition points in the rotating speed intervals as high-probability working condition intervals;
and taking the central working point of the high-probability working condition interval as the plurality of acquisition points, and drawing the emission curve according to the rotating speeds and the loads of all the central working points.
2. The method of claim 1, wherein said plotting said emission profile as a function of rotational speed and load at all center operating points comprises:
determining a vehicle speed of the center operating point based on the rotational speed and the load;
and running for preset time according to the vehicle speed of the central working point, and drawing the emission curve according to the running results corresponding to all the central working points.
3. The method of claim 1, wherein the weighted average catalytic conversion efficiency is calculated as:
wherein n is the number of the acquisition points, and the catalytic conversion efficiency i For the catalytic efficiency of the ith acquisition point, weighting factor i Is the weighting factor for the i-th acquisition point.
4. The method as recited in claim 1, further comprising:
generating a failure 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.
5. A catalytic conversion efficiency detection device of a vehicle catalyst, characterized by comprising:
the acquisition module is used for acquiring pre-catalysis tail gas emission data and post-catalysis tail gas emission data of a plurality of acquisition points when the engine runs according to an emission curve;
the calculation module is used for calculating the catalytic conversion efficiency at each acquisition point according to the ratio between the pre-catalysis tail gas emission data and the post-catalysis tail gas emission data; and
the judging module is used for carrying out weighted average on the catalytic efficiency at all the acquisition 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 efficiency is greater than a qualification threshold;
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 collecting the exhaust emission data of a plurality of collecting points when the engine operates 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 working condition intervals meeting the number of preset working condition points in the rotating speed intervals as high-probability working condition intervals; taking the central working point of the high-probability working condition interval as the plurality of acquisition points, and drawing the emission curve according to the rotating speeds and loads of all the central working 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 preset time according to the vehicle speed of the central working point, and drawing the emission curve according to the running results corresponding to all the central working points.
6. The apparatus of claim 5, wherein the weighted average catalytic conversion efficiency is calculated by the formula:
wherein n is the number of the acquisition points, and the catalytic conversion efficiency i For the catalytic efficiency of the ith acquisition point, weighting factor i Is the weighting factor for the i-th acquisition point.
7. The apparatus as recited in claim 5, further comprising:
and the generation module is used for generating a disqualification 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 the qualification threshold.
8. A vehicle comprising the catalytic conversion efficiency detection apparatus of a vehicle catalyst according to any one of claims 5 to 7.
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| DE19852240A1 (en) * | 1998-11-12 | 2000-05-18 | Volkswagen Ag | Monitoring method for NOx storage catalytic converters and exhaust gas purification device for carrying out this method |
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| US6151547A (en) * | 1999-02-24 | 2000-11-21 | Engelhard Corporation | Air/fuel ratio manipulation code for optimizing dynamic emissions |
| CN203385554U (en) * | 2013-08-08 | 2014-01-08 | 安徽江淮汽车股份有限公司 | Basic calibration system for vehicle engine control unit |
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