A test method for real-time determination of excessive fueling emissions of a vehicle

Abstract

The present application relates to the technical field of automobile emission testing, and specifically discloses a testing method for real-time determination of excessive fueling emission of a vehicle, which comprises collecting vehicle data by using a vehicle-mounted emission detection device; arranging the vehicle data to generate a corresponding fueling emission test condition set; sorting each fueling emission test condition in the fueling emission test condition set according to the order of fueling time; calculating the pollutant emission limit value under the single fueling amount in each fueling emission test condition and the final result value of the pollutant emission test during the fueling process; and comparing and determining whether the current corresponding fueling emission test condition is excessive according to the calculated pollutant emission limit value and final result value. The present application can solve the problem that the vehicle cannot be determined and warned in time when the vehicle fueling process causes excessive pollutants.

Description

Technical Field

[0001] This invention relates to the field of automotive emissions testing technology, and specifically to a testing method for real-time determination of excessive emissions during vehicle refueling. Background Technology

[0002] With the development of the automotive industry and the social economy, as well as the national policies on carbon peaking and carbon neutrality, my country has attached unprecedented importance to vehicle emissions.

[0003] During the refueling process, vehicles are affected by multiple factors, which will generate a certain amount of fuel vapor and directly evaporate into the air, causing air pollution. Therefore, when formulating the "National VI" standard, my country included the "Refueling Process Pollutant Emission Test (Type VII Test)" and set the strictest limit standard in the world.

[0004] Existing pollutant emission tests during refueling primarily involve pre-treating the vehicle and charcoal canister before fuel is added to determine the amount of hydrocarbons volatilized during refueling, thereby assessing the environmental pollution caused by pollutants generated during the refueling process. This testing procedure is complex, time-consuming, and labor-intensive, and it cannot monitor in-use vehicles in real time. Furthermore, if pollutant levels exceed standards during refueling, it cannot be promptly identified and alerted, leading to inaccurate test results.

[0005] Therefore, there is an urgent need for a testing method to determine whether vehicle refueling emissions exceed standards in real time. This method would solve the problem in existing technologies where light-duty gasoline vehicles and light-duty gasoline / electric hybrid vehicles cannot promptly detect and warn of excessive levels of pollutants (HC) during refueling. Summary of the Invention

[0006] One of the objectives of this invention is to provide a test method for real-time determination of excessive emissions during vehicle refueling, which can solve the problem in the prior art that when light-duty gasoline vehicles and light-duty gasoline / electric hybrid vehicles are refueled, pollutants exceed the standard during the actual use of the vehicle, and the problem cannot be detected and warned in time.

[0007] To achieve the above objectives, a testing method for real-time determination of vehicle refueling emissions exceeding standards is provided, comprising the following steps:

[0008] S1. Collect vehicle data using on-board emission testing equipment;

[0009] S2. According to a predefined refueling emission test condition, organize the vehicle data to generate a corresponding refueling emission test condition set; the predefined refueling emission test condition is the process from when the refueling nozzle is turned on until when the refueling nozzle is turned off, and it is not turned on again within a preset time after it is turned off;

[0010] S3. Sort the various refueling emission test conditions in the refueling emission test condition set according to the order of refueling time.

[0011] S4. Based on the vehicle data in each refueling emission test condition, calculate the pollutant emission limit under a single fuel refueling amount in each refueling emission test condition and the final result value of the pollutant emission test during the refueling process.

[0012] S5. Based on the calculated pollutant emission limits and the final result value, compare and determine whether the current refueling emission test condition exceeds the emission limit. If the final result value is greater than the pollutant emission limit, the judgment result is that the refueling emission test condition exceeds the emission limit; otherwise, the judgment result is that the refueling emission test condition does not exceed the emission limit.

[0013] S6. Based on the judgment results corresponding to each refueling emission test condition, determine them in sequence. If the judgment result of the refueling emission test condition exceeds the standard three or more times within 10 consecutive refueling emission test conditions, then when refueling is carried out next time, a warning message will be issued through the on-board detection equipment, and the corresponding data will be uploaded to the background.

[0014] The principle and effect of this solution are as follows: First, vehicle data is collected using on-board emission testing equipment. Then, the vehicle data is organized according to a predefined refueling emission test condition to form a refueling emission test condition set. Specifically, a refueling emission test condition is defined as the refueling nozzle being turned on until it is turned off, and not being turned on again within a preset time after being turned off. This method organizes the data, making the boundary conditions of the data more stable and continuous, and the test data more accurate.

[0015] Then, the fuel application for each refueling emission test condition is sorted to organize the test conditions. Next, the vehicle data for each refueling emission test condition is processed sequentially to calculate both the final result of the pollutant emission test during refueling and the pollutant emission limit for a single fuel refueling amount. By comparing these two data points, it is determined whether the refueling emissions for the corresponding test condition exceed the standard. Based on this determination, if emissions exceed the standard after accumulating over 10 consecutive refueling emission test conditions, an early warning is issued via the onboard emission detection equipment during the next refueling operation, and the data is uploaded to the background. This achieves real-time detection of vehicle refueling emission exceedances, solving the problem in existing technologies where pollutant exceedances during refueling of light-duty gasoline vehicles and light-duty gasoline / electric hybrid vehicles cannot be detected and warned in a timely manner.

[0016] By monitoring all vehicles in use for real-time emissions exceeding standards during refueling and uploading the corresponding data to the backend, vehicle manufacturers or environmental protection authorities can obtain and understand the refueling pollution emissions of each vehicle through the backend. This facilitates the management of vehicles by manufacturers or environmental protection authorities, greatly reducing the complexity of managing excessive refueling pollution emissions. At the same time, it can also promptly remind vehicle owners to facilitate subsequent maintenance and other operations.

[0017] Meanwhile, the corresponding testing methods are simple, greatly saving testing costs; they have broad coverage, capable of testing all light-duty gasoline vehicles and light-duty gasoline / electric hybrid vehicles on the market; they can provide a reference for manufacturers or environmental protection authorities to supervise, and manufacturers or environmental protection authorities only need to test vehicles whose emissions already exceed the standards under this testing method, without needing to conduct additional tests.

[0018] Furthermore, the vehicle data includes vehicle model, VIN, fuel tank volume, fuel filling amount, number of times the fuel nozzle is opened and closed, ambient temperature, real-time HC emissions per second during fuel filling, as well as fuel filling time, temperature, fuel filling flow rate, charcoal canister working capacity, effective volume and temperature, and fuel tank temperature.

[0019] Beneficial effects: Diversifying the types of vehicle data collection provides a better foundation for subsequent data analysis.

[0020] Furthermore, the steps between S2 and S3 include:

[0021] S230. Filter the data in each refueling emission test condition in the refueling emission test condition set. If the preset filtering conditions are not met, delete the refueling emission test condition.

[0022] The screening criteria include fuel filling temperature: 20℃±1℃;

[0023] Fuel filling flow rate: 37L / min ± 1L / min;

[0024] Ambient temperature: 23℃±3℃;

[0025] The time interval between two refueling nozzle activations is 3 to 15 seconds.

[0026] Beneficial effects: By setting filtering conditions to filter data within each refueling emission test condition, it is more conducive to the effective analysis of the data in the future.

[0027] Furthermore, S2 and S3 also include the following steps:

[0028] S231. Based on the selected refueling emission test conditions, the working capacity of the charcoal canister and the fuel tank temperature in each refueling emission test condition are analyzed in real time. The initial working capacity of the charcoal canister, the initial data of the effective volume, and the different volatilization rates of gasoline at different temperatures are analyzed. The collected vehicle data are corrected according to the analysis results.

[0029] Beneficial Effects: This solution fully considers the need to thoroughly desorb the charcoal canister during refueling emission tests, disconnect the charcoal canister from the fuel tank, and then allow the vehicle to stand in an environment at 23℃±3℃ for 6–36 hours until the engine oil and coolant temperatures reach 23℃±2℃ before reconnecting the charcoal canister to the fuel tank for refueling emission tests. Before refueling, although the vehicle may have traveled a certain distance, it cannot be guaranteed that the charcoal canister has been completely desorbed. Furthermore, vehicle operation causes an increase in overall vehicle temperature, primarily in the fuel tank and charcoal canister, leading to accelerated fuel vapor evaporation and directly affecting the accuracy of refueling emission data. Therefore, by analyzing the charcoal canister's working capacity and fuel tank temperature in real time for each refueling emission test condition and correcting the vehicle data based on the analysis results, the accuracy of the data is greatly improved.

[0030] Furthermore, S1 also includes:

[0031] When the vehicle is turned off and the fuel filler cap is turned on, the on-board emission detection equipment starts a self-test program to perform a self-test, calibrate the on-board emission detection equipment, and collect the fuel vapor concentration at this time, using this concentration as the zero point.

[0032] Beneficial effects: In this solution, when the vehicle is turned off and the fuel filler cap is clicked, the on-board emission testing equipment starts a self-test program to perform a self-test, thereby calibrating the on-board emission testing equipment. It fully considers that the pollutant emission test (Type VII test) during the refueling process is carried out in a closed evaporation chamber, while refueling is carried out in a gas station. In this environment, there are large temperature and humidity changes and high fuel vapor concentration. This solution greatly avoids the influence of these factors on the test.

[0033] Furthermore, S4 includes the following steps:

[0034] S40. Based on the vehicle data corresponding to each refueling emission test condition, and using the first calculation formula, calculate the final result value of the pollutant emission test during the refueling process in each refueling emission test condition.

[0035] The first calculation formula is:

[0036]

[0037] RE i The pollutant emissions during the refueling process are expressed in g / L.

[0038] M HCi The mass of the hydrocarbon is in grams.

[0039] V Di Fuel filling volume, in liters (L);

[0040] S41. Based on the second calculation formula, calculate the pollutant emission limits for a single fuel refueling amount under each refueling emission test condition; the second calculation formula is:

[0041]

[0042] T i =T0×A i

[0043] A i The ratio of a single fuel fill to 85% of the nominal volume of the fuel tank, 1;

[0044] V 0.85 It is 85% of the nominal volume of the fuel tank, in liters (L).

[0045] T i The pollutant emission limits for a refueling emission test condition;

[0046] T0 is the limit specified in the standard: 0.05 g / L. Attached Figure Description

[0047] Figure 1This is a flowchart of a test method for real-time determination of vehicle refueling emissions exceeding standards, as described in an embodiment of the present invention. Detailed Implementation

[0048] The following detailed description illustrates the specific implementation method:

[0049] Example 1

[0050] A test method for real-time determination of vehicle refueling emissions exceeding standards, basically as follows: Figure 1 As shown, it includes the following steps:

[0051] S1. Vehicle data is collected using on-board emission testing equipment. This vehicle data includes vehicle model, VIN, fuel tank capacity, fuel filler quantity, number of times the fuel nozzle is opened and closed, ambient temperature, real-time HC emissions per second during fuel filling, fuel filling time, temperature, fuel filling flow rate, charcoal canister capacity, effective volume and temperature, and fuel tank temperature. Specific data is shown in the table below. In this implementation, data is collected for each refueling operation.

[0052]

[0053]

[0054] Table 1: Vehicle data for refueling emission test conditions

[0055] S1 also includes:

[0056] When the vehicle is turned off and the fuel filler cap is clicked, the on-board emission detection equipment initiates a self-test program to calibrate itself and simultaneously collects the fuel vapor concentration at that moment, using this concentration as the zero point. In this embodiment, it is mainly considered that the pollutant emission test (Type VII test) during refueling, according to GB 18352.6-2016 "Limits and Measurement Methods for Pollutant Emissions from Light-Duty Vehicles (China Stage VI)", is conducted in a closed evaporation chamber. In-use refueling takes place at a gas station, where there are significant temperature and humidity variations and high fuel vapor concentrations.

[0057] S2. According to a predefined refueling emission test condition, organize the vehicle data to generate a corresponding refueling emission test condition set; the predefined refueling emission test condition is the process from when the refueling nozzle is turned on until when the refueling nozzle is turned off, and it is not turned on again within a preset time after it is turned off;

[0058] The steps between S2 and S3 are as follows:

[0059] S230. Filter the data in each refueling emission test condition in the refueling emission test condition set. If the preset filtering conditions are not met, delete the refueling emission test condition.

[0060] The screening criteria include fuel filling temperature: 20℃±1℃;

[0061] Fuel filling flow rate: 37L / min ± 1L / min;

[0062] Ambient temperature: 23℃±3℃;

[0063] The time interval between two refueling nozzle activations is 3 to 15 seconds. In this embodiment, if any data does not meet the corresponding filtering criteria, the data for that operating condition is considered unqualified and must be deleted. For example, as shown in Table 1, the data in operating conditions 5, 9, and 13 do not meet the requirements and are directly deleted. In this embodiment, if the time is less than 3 seconds, the data is invalid. If the time is greater than 15 seconds, it is defined as the second operating condition.

[0064] S231. Based on the selected refueling emission test conditions, the working capacity of the charcoal canister and the fuel tank temperature are analyzed in real time under each refueling emission test condition. The initial working capacity of the charcoal canister, the initial effective volume data, and the different volatilization rates of gasoline at different temperatures are analyzed, and the collected vehicle data are corrected according to the analysis results. In this embodiment, considering that when conducting the refueling process pollutant emission test (Type VII test) according to GB 18352.6-2016 "Limits and Measurement Methods for Pollutant Emissions from Light-Duty Vehicles (China Stage VI)", it is necessary to completely desorb the vehicle's charcoal canister, disconnect the pipeline connecting the charcoal canister to the fuel tank, and then place the vehicle in an environment with a temperature of 23℃±3℃ for 6 to 36 hours until the vehicle's engine oil temperature and coolant temperature reach 23℃±2℃ before reconnecting the pipeline between the charcoal canister and the fuel tank, the refueling process pollutant emission test can then be conducted. Before refueling, even if the vehicle has traveled a certain distance, it cannot be guaranteed that the charcoal canister has completely desorbed pollutants. Furthermore, vehicle operation causes the overall vehicle temperature to rise, primarily in the fuel tank and charcoal canister, leading to accelerated fuel vapor evaporation. This directly affects the accuracy of pollutant emission data during refueling. Therefore, real-time data collection of the charcoal canister's working capacity and fuel tank temperature is conducted. The initial working capacity and effective volume of the charcoal canister, along with the different evaporation rates of gasoline at different temperatures, are used to correct the data collected during actual refueling to ensure accuracy.

[0065] S3. Sort the various refueling emission test conditions in the refueling emission test condition set according to the order of fuel refueling time. In this embodiment, the various refueling emission test conditions are sorted according to the order of fuel refueling time, and the conditions are defined as Condition 1, Condition 2, Condition 3, etc.

[0066] S4. Based on the data from each refueling emission test condition, calculate the pollutant emission limit for a single fuel refueling amount under each refueling emission test condition and the final result value of the pollutant emission test during the refueling process.

[0067] S4 includes the following steps:

[0068] S40. Based on the vehicle data corresponding to each refueling emission test condition, and using the first calculation formula, calculate the final result value of the pollutant emission test during the refueling process in each refueling emission test condition.

[0069] The first calculation formula is:

[0070]

[0071] RE i The pollutant emissions during the refueling process are expressed in g / L.

[0072] M HCi The mass of the hydrocarbon is in grams.

[0073] V Di Fuel filling volume, in liters (L);

[0074] S41. Based on the second calculation formula, calculate the pollutant emission limits for a single fuel refueling amount under each refueling emission test condition; the second calculation formula is:

[0075]

[0076] T i =T0×A i

[0077] A i The ratio of a single fuel fill to 85% of the nominal volume of the fuel tank, 1;

[0078] V 0.85 It is 85% of the nominal volume of the fuel tank, in liters (L).

[0079] T i The pollutant emission limits for a refueling emission test condition;

[0080] T0 is the limit specified in the standard: 0.05 g / L. In this embodiment, T0 is the limit specified in GB 18352.6-2016 "Limits and Measurement Methods for Pollutant Emissions from Light-Duty Vehicles (China VI)" standard: 0.05 g / L. In this embodiment, the corresponding calculation results will be displayed in tabular form, as shown in Table 2:

[0081] 1 0.001 68.63 0.034 qualified -- 2 0.002 39.22 0.020 qualified -- 3 0.000 78.43 0.039 qualified -- 4 0.000 58.82 0.029 qualified -- 6 0.017 58.82 0.029 qualified -- 7 0.013 58.82 0.029 qualified -- 8 0.039 39.22 0.020 Unqualified -- 10 0.002 66.67 0.033 qualified -- 11 0.010 98.04 0.049 qualified -- 12 0.076 78.43 0.039 Unqualified no 14 0.034 58.82 0.029 Unqualified no 15 0.013 78.43 0.039 qualified yes

[0082] Table 2 shows the calculation results for the refueling emission test conditions.

[0083] S5. Based on the calculated pollutant emission limits and the final result value, compare and determine whether the current refueling emission test condition exceeds the emission limit. If the final result value is greater than the pollutant emission limit, the judgment result is that the refueling emission test condition exceeds the emission limit; otherwise, the judgment result is that the refueling emission test condition does not exceed the emission limit.

[0084] S6. Based on the judgment results corresponding to each refueling emission test condition, the results are determined sequentially. If the judgment result of three or more consecutive refueling emission test conditions indicates that the refueling emission test condition exceeds the standard, a warning message will be issued through the on-board detection equipment during the next fuel refueling, and the corresponding data will be uploaded to the background. In this embodiment, when issuing a warning, the driver, vehicle manufacturer, and environmental protection authorities will be notified. Specifically, the data corresponding to the refueling emissions of vehicles in use will be uploaded to the server in the background. In this way, vehicle manufacturers and environmental protection authorities can access the server to obtain the refueling emission data of each vehicle in use, thereby achieving effective supervision of the refueling emission data of vehicles in use. This solves the problem of the difficulty in supervising the refueling emissions of vehicles in use, and also promptly reminds vehicle owners of vehicles in use, effectively addressing the problem of excessive pollution.

[0085] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Some typical well-known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A test method for real-time determination of vehicle refueling emissions exceeding standards, characterized in that: Includes the following steps: S1. Collect vehicle data using on-board emission testing equipment; S2. According to a predefined refueling emission test condition, organize the vehicle data to generate a corresponding refueling emission test condition set; the predefined refueling emission test condition is the process from when the refueling nozzle is turned on until when the refueling nozzle is turned off, and it is not turned on again within a preset time after it is turned off; S3. Sort the various refueling emission test conditions in the refueling emission test condition set according to the order of refueling time. S4. Based on the vehicle data in each refueling emission test condition, calculate the pollutant emission limit under a single fuel refueling amount in each refueling emission test condition and the final result value of the pollutant emission test during the refueling process. S5. Based on the calculated pollutant emission limits and the final result value, compare and determine whether the current refueling emission test condition exceeds the emission limit. If the final result value is greater than the pollutant emission limit, the judgment result is that the refueling emission test condition exceeds the emission limit; otherwise, the judgment result is that the refueling emission test condition does not exceed the emission limit. S6. Based on the judgment results corresponding to each refueling emission test condition, determine them in sequence. If the judgment result of the refueling emission test condition exceeds the standard three or more times in a total of 10 consecutive refueling emission test conditions, then when refueling is carried out next time, a warning message will be issued through the on-board detection equipment and the corresponding data will be uploaded to the background. The vehicle data includes vehicle model, VIN, fuel tank volume, fuel filling amount, number of times the fuel nozzle is opened and closed, ambient temperature, real-time HC emissions per second during fuel filling, as well as fuel filling time, temperature, fuel filling flow rate, charcoal canister working capacity, effective volume and temperature, and fuel tank temperature. S4 includes the following steps: S40. Based on the vehicle data corresponding to each refueling emission test condition, and using the first calculation formula, calculate the final result value of the pollutant emission test during the refueling process in each refueling emission test condition. The first calculation formula is: The pollutant emissions during the refueling process are expressed in g / L. The mass of the hydrocarbon is in grams. The fuel volume for a single refueling, in liters (L). S41. Based on the second calculation formula, calculate the pollutant emission limits for a single fuel refueling amount under each refueling emission test condition. The second calculation formula is: It is the ratio of the amount of fuel added in a single transaction to 85% of the nominal volume of the fuel tank; It is 85% of the nominal volume of the fuel tank, in L; The pollutant emission limits for a refueling emission test condition; The limit specified in the standard is 0.05 g / L.

2. The test method for real-time determination of vehicle refueling emissions exceeding standards according to claim 1, characterized in that: The steps between S2 and S3 are as follows: S230. Filter the data in each refueling emission test condition in the refueling emission test condition set. If the preset filtering conditions are not met, delete the refueling emission test condition. The screening conditions include: fuel filling temperature: 20℃±1℃; fuel filling flow rate: 37L / min±1L / min; ambient temperature: 23℃±3℃; and the time interval between two fuel nozzle openings: 3 seconds to 15 seconds.

3. The test method for real-time determination of vehicle refueling emissions exceeding standards according to claim 2, characterized in that: S2 and S3 further include the following steps: S231. Based on the selected refueling emission test conditions, the working capacity of the charcoal canister and the fuel tank temperature in each refueling emission test condition are analyzed in real time. The initial working capacity of the charcoal canister, the initial data of the effective volume, and the different volatilization rates of gasoline at different temperatures are analyzed. The collected vehicle data are corrected according to the analysis results.

4. The test method for real-time determination of vehicle refueling emissions exceeding standards according to claim 3, characterized in that: S1 also includes: When the vehicle is turned off and the fuel filler cap is turned on, the on-board emission detection equipment starts a self-test program to perform a self-test, calibrate the on-board emission detection equipment, and collect the fuel vapor concentration at this time, using this concentration as the zero point.

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