Carbon tank performance detection device and detection method

Abstract

The invention discloses a carbon tank performance detection device and method, and the device comprises a vibration table which bears at least one carbon tank and can apply mechanical vibration to the borne carbon tank; the fuel oil system is connected with the carbon tank and is used for conveying volatile oil gas into the carbon tank; the gas measuring device is connected with the carbon tank and is used for monitoring the gas concentration in the adsorption or desorption process of the carbon tank; and the control system is in communication connection with the vibration table, the fuel oil system and the gas measuring device, and is used for processing the received data and issuing a control instruction. The carbon tank performance detection device provided by the invention can simulate the mechanical vibration and volatile oil gas environment in the actual running of the vehicle, accurately evaluate the adsorption and desorption performance of the carbon tank under the real working condition, avoid the deviation caused by the single working condition in the traditional test method, and provide reliable data support. Meanwhile, a multi-carbon-tank parallel testing function is achieved, the testing period can be shortened, and the testing efficiency is improved.

Description

Technical Field

[0001] The present application generally relates to the technical field of components for vehicle fuel evaporation control systems. More specifically, the present application relates to a carbon canister performance testing device; furthermore, the present application also relates to a method for testing the performance of a carbon canister. Background Art

[0002] With the continuous increase in vehicle ownership, vehicle exhaust emissions have become a significant source of environmental pollution. To address this challenge, countries around the world have introduced increasingly stringent environmental regulations, placing higher demands on vehicle evaporative emissions control. In this context, the EVAP (Evaporative Air Pollution Control) system, as a key system for controlling evaporative emissions, has a direct impact on vehicle emissions levels. The carbon canister, a core component of the EVAP system, primarily serves to adsorb and store fuel vapor and release it to the engine for combustion. Its performance has a crucial impact on the efficiency of controlling evaporative pollutants.

[0003] However, traditional carbon canister performance testing equipment has numerous shortcomings in terms of technical principles, test scenario coverage, and evaluation dimensions, making it difficult to meet current practical needs. In terms of test conditions, traditional equipment is typically only capable of performance testing under steady-state operating conditions and fixed oil and gas concentrations. This single-mindedness results in significant deviations between the measured adsorption or desorption efficiency and the actual performance of the carbon canister, making it impossible to accurately assess the vehicle's emissions control capabilities.

[0004] Furthermore, in terms of dynamic process monitoring, traditional tests rely on static indicators such as adsorption saturation time and desorption residue to evaluate carbon canister performance, lacking real-time monitoring of the entire adsorption or desorption process. For example, it is difficult to accurately capture changes in the adsorption rate of a carbon canister under transient high-concentration oil and gas shock, or localized penetration caused by uneven airflow distribution during desorption.

[0005] Given the numerous limitations of traditional carbon canister performance testing equipment, developing a comprehensive, accurate, and efficient carbon canister performance testing device and method is crucial and urgent. This will not only improve the design, production, and optimization of carbon canisters, but also better meet increasingly stringent environmental regulations and provide strong support for the performance testing and development of automotive exhaust emission control equipment.

[0006] In view of this, there is an urgent need to provide a carbon canister performance detection device and detection method solution to improve the detection accuracy and efficiency of the carbon canister. Summary of the Invention

[0007] In order to at least solve one or more of the technical problems mentioned above, the present application proposes a carbon canister performance detection device and detection method scheme with higher accuracy and efficiency in carbon canister performance detection in multiple aspects.

[0008] In the first aspect, the present application provides a carbon canister performance detection device, comprising: a vibration table, which carries at least one carbon canister and can apply mechanical vibration to the carried carbon canister; a fuel system, which is connected to the carbon canister and is used to transport volatile oil and gas into the carbon canister; a gas measuring device, which is connected to the carbon canister and is used to monitor the gas concentration during the adsorption or desorption process of the carbon canister; and a control system, which is communicatively connected to the vibration table, the fuel system and the gas measuring device, and is used to process the received data and issue control instructions.

[0009] In some embodiments, a temperature control device is further included, which is connected to the fuel system and the control system; the temperature control device includes a heat exchanger and a temperature sensor, wherein the temperature sensor is arranged at the air outlet of the heat exchanger, and the heat exchanger is connected to the carbon canister and adjusts the temperature of the gas entering the carbon canister.

[0010] In some embodiments, a pressure control device is further included that is communicatively connected to the control system; the pressure control device includes a pressure regulator and a pressure sensor, wherein the pressure sensor is arranged in the carbon canister, and the pressure regulator is arranged on the connecting pipe between the gas measuring device and the carbon canister.

[0011] In some embodiments, a condenser is further included; the condenser is connected to the gas outlet end of the carbon canister and is connected to the fuel system in an on-off manner.

[0012] In some embodiments, a gas-liquid separator is further included, and the gas-liquid separator is connected to the condenser, the gas measuring device and the fuel system respectively.

[0013] In some embodiments, a filter is further connected to the air inlet of the carbon canister, and the filter is used to filter impurities in the gas entering the carbon canister.

[0014] In a second aspect, the present application provides a method for testing the performance of a carbon canister using the above-mentioned device. The testing of the adsorption performance comprises the following steps:

[0015] S1. Control the fuel system to deliver volatile oil or butane into the carbon canister;

[0016] S2. Perform at least one of the following tests on the carbon canister:

[0017] Mechanical vibration test: simulate vehicle driving vibration by using a vibration table at preset frequency, amplitude and acceleration;

[0018] Temperature cycle test: The gas temperature is controlled within a preset temperature range through a heat exchanger and a temperature sensor;

[0019] Pressure cycle test: The system pressure is controlled within the preset pressure range through the pressure regulating valve;

[0020] S3. The gas measuring device detects the gas concentration data discharged from the carbon canister and transmits the data to the control system. The control system processes the data to obtain the adsorption capacity, transient adsorption rate and adsorption saturation time of the carbon canister.

[0021] In some embodiments, the desorption performance test comprises the following steps:

[0022] S4, shut down the fuel system and control the air intake system to deliver gas to the carbon canister;

[0023] S5. Performing a test on the carbon canister, wherein the test includes at least one of the mechanical vibration test, the temperature cycle test, and the pressure cycle test;

[0024] S6. During the desorption process, the mixed gas discharged from the carbon canister is introduced into the condenser for complete condensation. The condensed liquid fuel is separated by the gas-liquid separator and returned to the fuel system. The separated gas enters the gas measuring device to measure the concentration data and transmit the data to the control system. The control system processes the data to obtain the desorption residue of the carbon canister.

[0025] In some embodiments, the durability of the carbon canister during long-term use is evaluated by combining the butane adsorption efficiency decline curve and the temperature rise effect data in multiple cycle tests.

[0026] In some embodiments, multiple carbon canisters are placed on the same vibration table, and independent gas pipelines and pressure regulating valves are used to provide each carbon canister with the same temperature, pressure, and oil and gas concentration test conditions, so that multi-condition comprehensive testing can be performed simultaneously.

[0027] Through the carbon canister performance testing device provided above, the embodiment of the present application sets up a vibration table that can carry at least one carbon canister and can apply mechanical vibration to the carbon canister, as well as a fuel system that provides volatile oil and gas to the carbon canister. It can not only simultaneously detect the performance of multiple carbon canisters, shorten the test cycle, and improve test efficiency, but also simulate the mechanical vibration and volatile oil and gas environment during actual driving of the vehicle, accurately evaluate the adsorption and desorption performance of the carbon canister under real working conditions, avoid the deviation of traditional testing methods caused by a single working condition, and provide reliable data support. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other objects, features and advantages of the exemplary embodiments of the present application will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0029] Figure 1 A schematic diagram of a carbon canister performance detection device according to an embodiment of the present application is shown;

[0030] Figure 2 A flow chart of a carbon canister performance detection method according to an embodiment of the present application is shown;

[0031] Figure 3 A flow chart of a carbon canister performance detection method according to an embodiment of the present application is shown.

[0032] In the figure: 100, detection device:

[0033] 101. Carbon canister; 102. Vibration table; 103. Fuel tank; 103-1. Evaporator; 104. Gas measuring device; 105. Heat exchanger; 106. Condenser; 107. Gas-liquid separator; 108. First air intake line; 109. Second air intake line; 110. Third air intake line; 111. First solenoid valve; 112. Second solenoid valve; 113. Pressure regulating valve; 114. Filter. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0035] It should be understood that the terms "include" and "comprising" used in the description and claims of this application indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0036] It should also be understood that the terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this specification and claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should also be further understood that the term "and / or" as used in this specification and claims refers to any and all possible combinations of one or more of the associated listed items, including and including these combinations.

[0037] As used in this specification and claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0038] The specific implementation of the present application will be described in detail below with reference to the accompanying drawings.

[0039] like Figure 1 As shown, in some embodiments, the present application provides a carbon canister 101 performance detection device 100, which includes: a vibration table 102, which carries at least one carbon canister 101 and can apply mechanical vibration to the carried carbon canister 101; a fuel system, which can be connected to the carbon canister 101 and is used to transport volatile oil and gas into the carbon canister 101; a gas measuring device 104, which is connected to the carbon canister 101 and is used to monitor the gas concentration during the adsorption or desorption process of the carbon canister 101; and a control system, which is communicatively connected to the vibration table 102, the fuel system and the gas measuring device 104, and is used to process the received data and issue control instructions.

[0040] The carbon canister 101 performance detection device 100 provided in this solution includes a vibration table 102, a fuel system, a gas measuring device 104 and a control system. Specifically, the vibration table 102 can carry at least one carbon canister 101, and can apply mechanical vibration according to the vibration frequency, amplitude, acceleration and duration set by the user through the control system, simulate the vibration working conditions during vehicle driving, and test the vibration environment performance and durability of the carbon canister 101. The fuel system is connected to the carbon canister 101 and is used to transport volatile oil and gas into the carbon canister 101, and the oil and gas flow rate and concentration can be adjusted within a certain range. The gas measuring device 104 is a hydrogen flame ionization detector (FID), which is connected to the air outlet of the carbon canister 101 and is used to monitor the change in gas concentration in real time during the adsorption or desorption process, providing key data for evaluating the adsorption and desorption efficiency of the carbon canister 101. The control system serves as the core control unit and is connected to the vibration table 102, the fuel system and the gas measuring device 104 for communication. It receives and processes the data fed back from the vibration table 102, the fuel system and the gas measuring device 104, and issues control instructions to each execution component according to the preset test procedures and parameters, thereby achieving precise control and automated operation of the entire test process.

[0041] It's worth noting that the fuel evaporation system in this embodiment includes a fuel tank 103, a fuel pump (not shown), and an evaporator 103-1, with the evaporator 103-1 also connected to a first air intake line 108. Specifically, the fuel tank 103 stores fuel, while the fuel pump, installed inside the tank 103 or on a pipeline connected to the tank 103, pumps fuel from the tank 103 and delivers it to the evaporator 103-1. The evaporator 103-1, a key component of the system, is connected to the first air intake line 108, which draws in outside air to mix with the fuel vapor in the evaporator 103-1 and drive the fuel vapor into the carbon canister 101 for adsorption.

[0042] The carbon canister 101 performance testing device 100 provided in this application can simulate the mechanical vibrations of a vehicle during actual driving, and the fuel evaporation system simulates the volatile oil and gas during actual driving. This allows for a more accurate assessment of the adsorption and desorption performance of the carbon canister 101 under real-world operating conditions, effectively avoiding the test result deviations associated with traditional testing methods due to the single test condition, and providing more reliable data support for the performance evaluation of the carbon canister 101. Furthermore, the device also features a multi-canister 101 parallel testing function, enabling simultaneous performance testing of multiple canisters 101 under the same test conditions, significantly shortening the testing cycle and improving testing efficiency.

[0043] In a specific embodiment, a temperature control device is also included, which is connected to the fuel system and the control system; the temperature control device includes a heat exchanger 105 and a temperature sensor, wherein the temperature sensor is arranged at the air outlet of the heat exchanger 105, and the heat exchanger 105 is connected to the carbon canister 101 and adjusts the temperature of the gas entering the carbon canister 101.

[0044] The device in this embodiment also includes a temperature control device connected to the fuel system control system. This device regulates the temperature of the fuel gas entering the carbon canister 101 from the fuel system to meet the requirements of testing or actual operating conditions. The temperature control device includes a heat exchanger 105 and a temperature sensor. Heat exchanger 105 regulates the gas temperature by exchanging heat with a cooling or heating medium. It is connected to the carbon canister 101, allowing the temperature-regulated gas to enter the carbon canister 101 directly. The temperature sensor is located at the outlet of heat exchanger 105, monitoring the gas temperature in real time and feeding the signal back to the control system to accurately adjust the heat exchanger 105 to ensure that the temperature of the gas entering the carbon canister 101 remains stable within the set range.

[0045] The temperature control device in this solution can simulate the temperature changes of the vehicle when it is running under different climatic conditions, which makes the performance test of the carbon canister 101 more accurate, can truly reflect its actual adsorption and desorption efficiency, and provide reliable data support for performance evaluation.

[0046] In a specific embodiment, a condenser 106 is further included; the condenser 106 is connected to the gas outlet end of the carbon canister 101 and is connected to the fuel system in an on-off manner.

[0047] The performance testing device 100 in this embodiment also includes a condenser 106, which is connected to the outlet of the carbon canister 101 and is used to receive and condense the gas (including unadsorbed oil vapor, air, and trace amounts of VOCs) that escapes from the carbon canister 101 after adsorption saturation or during desorption. Furthermore, the condenser 106 is also connected to the fuel system via a switchable connection. This means that when adsorption saturation is reached, a second solenoid valve 112 connecting the condenser 106 and the fuel system is activated, allowing the condensed oil to enter the fuel system directly through the pipeline.

[0048] In a specific embodiment, it further includes a gas-liquid separator 107, which is connected to the condenser 106, the gas measuring device 104 and the fuel system respectively.

[0049] The carbon canister performance detection device 100 in this solution also includes a gas-liquid separator 107, and the gas-liquid separator 107 is respectively connected to the condenser 106, the gas measuring device 104 and the fuel tank in the fuel system. During the adsorption test, when the carbon canister 101 reaches the adsorption saturation state, the excess volatile oil and gas that are not adsorbed will flow through the high-efficiency condenser 106 along a preset path for rapid cooling and liquefaction. The liquefied oil and gas mixture flows into the gas-liquid separator 107, where the gas-liquid two-phase separation is completed, and the liquid fuel component is accurately recovered to the fuel system for recycling, while the remaining uncondensed gaseous oil and gas is introduced into the hydrogen flame ionization detector (FID) for real-time concentration monitoring. Similarly, in the desorption test link, the oil and gas desorbed from the carbon canister 101 also need to pass through the condenser 106 and the gas-liquid separator 107 in sequence for corresponding processing procedures.

[0050] In a specific embodiment, it also includes a pressure control device that is communicatively connected to the control system; the pressure control device includes a pressure regulator and a pressure sensor, wherein the pressure sensor is arranged in the carbon canister 101, and the pressure regulator is arranged on the connecting pipeline between the gas measuring device 104 and the carbon canister 101.

[0051] The performance detection device 100 in this solution also includes a pressure control device that is communicatively connected to the control system. The pressure control device includes a pressure regulator and a pressure sensor, wherein the pressure regulator is a pressure regulating valve 113 provided on the connecting pipeline between the gas measuring device 104 and the gas-liquid separator 107, which can effectively control the pressure of the gas entering the carbon canister 101, accurately adjust it according to actual needs, and prevent pressure fluctuations. The pressure sensor is installed inside the carbon canister 101 and can monitor the pressure changes in the carbon canister 101 in real time. During the adsorption and desorption process of the carbon canister 101, the pressure sensor monitors the pressure in the carbon canister 101 in real time and converts the pressure signal into an electrical signal to feed back to the control system. The control system accurately controls the pressure regulator based on the preset pressure parameters and the information fed back by the sensor.

[0052] Those skilled in the art will appreciate that the atmospheric pressure environment of the carbon canister 101 can vary significantly at different vehicle altitudes and driving conditions. This solution utilizes a pressure control device to simulate the atmospheric pressure conditions under various actual operating conditions, making the test more closely aligned with the vehicle's actual operating environment and improving the applicability and reliability of the test results.

[0053] In a specific embodiment, a filter 114 is further connected to the air inlet of the carbon canister 101 , and the filter 114 is used to filter impurities in the gas entering the carbon canister 101 .

[0054] In this embodiment, the air inlet of the carbon canister 101 is connected to a second air inlet line 109, which is openable and disconnectable. This second air inlet line 109 is used to deliver nitrogen or air into the carbon canister 101. Furthermore, a filter 114 and a solenoid valve are connected to the second air inlet line 109. The filter 114 is used to filter dust, particulate matter, oil, and other impurities from the air entering the carbon canister 101, preventing these impurities from adhering to the surface of the activated carbon in the carbon canister 101 and clogging the pores between the activated carbon and reducing its adsorption performance.

[0055] It is worth noting that the filter 114 in this scheme is also connected to the connecting pipeline between the gas-liquid separator 107 and the gas measuring device 104 (not shown in the figure). The gas filtered by the filter 114 is directly introduced into the connecting pipeline to provide background gas for the gas measuring device 104.

[0056] In a specific embodiment, the carbon canister 101 has a third air inlet line 110 that can be switched on and off at the air inlet. The third air inlet line 110 is used to transport butane into the carbon canister 101 so that the carbon canister 101 can undergo a volatile organic compound (VOC) test.

[0057] In this solution, a third air intake line 110 is installed at the air inlet of carbon canister 101. This line is equipped with a high-precision electromagnetically controlled valve, providing an on-off connection to the air inlet of carbon canister 101. When the test is initiated, the valve opens, connecting third air intake line 110 to the air inlet of carbon canister 101, creating a dedicated test air path. When the test is complete or other operating tests are being performed, the valve closes, physically isolating third air intake line 110 and ensuring that the normal function of carbon canister 101 is not disturbed.

[0058] It's worth emphasizing that the core function of this third intake line 110 is to deliver butane test gas to the carbon canister 101. As a volatile organic compound (VOC) calibrant specified by national standards, butane's molecular properties are highly similar to those of fuel vapor, accurately simulating the oil and gas components handled by the carbon canister 101 during actual vehicle operation. During testing, a controlled concentration of butane mixture is injected into the carbon canister 101 through this line. This not only tests the maximum adsorption capacity and rate of the carbon canister 101 under dynamic conditions, but also its desorption capacity, providing important data support and technical basis for design optimization, performance improvement, and compliance with relevant emission regulations.

[0059] The carbon canister performance testing device provided in this application not only has the function of parallel testing of multiple carbon canisters, but can also perform performance tests on multiple carbon canisters at the same time under the same test conditions. It can also simulate the mechanical vibration of the vehicle during driving through a vibration table, adjust the gas temperature through a temperature control device, and control the gas pressure through a pressure control device. It can fully simulate the various complex working conditions that the carbon canister faces during actual driving, including different road conditions, climatic conditions, and driving conditions. This makes the test of carbon canister performance closer to the actual use scenario, avoids the test result deviation caused by the single working condition of traditional testing methods, and provides more accurate and reliable data support for carbon canister performance evaluation.

[0060] like Figure 2 As shown, in some embodiments, the present application provides a method for testing the performance of a carbon canister using the above-mentioned device, wherein the testing of the adsorption performance includes the following steps:

[0061] S1, control the fuel system to deliver volatile oil and gas into the carbon canister;

[0062] S2. Perform at least one of the following tests on the carbon canister:

[0063] Mechanical vibration test: simulate vehicle driving vibration by using a vibration table at preset frequency, amplitude and acceleration;

[0064] Temperature cycle test: The gas temperature is controlled within a preset temperature range through a heat exchanger and a temperature sensor;

[0065] Pressure cycle test: The system pressure is controlled within the preset pressure range through the pressure regulating valve;

[0066] S3. The gas measuring device detects the gas concentration data discharged from the carbon canister and transmits the data to the control system. The control system processes the data to obtain the adsorption capacity, transient adsorption rate and adsorption saturation time of the carbon canister.

[0067] The carbon canister performance testing method provided in this application uses the testing device described in the above embodiment to comprehensively test the adsorption performance of the carbon canister. The specific steps are as follows:

[0068] Step S1 includes connecting the first solenoid valve 111 between the fuel system and the carbon canister 101, controlling the fuel system to deliver volatile oil and gas into the carbon canister 101, and at the same time starting the fuel system and controlling the first air intake line 108 to ventilate the evaporator 103-1, thereby providing an oil and gas source for the adsorption performance test of the carbon canister 101 and simulating the process of fuel vapor entering the carbon canister 101 during actual vehicle operation.

[0069] The step S2 of performing at least one of the mechanical vibration test, temperature cycle test and pressure cycle test on the carbon canister 101 means that only one test can be performed, or two or three tests can be performed at the same time. Specifically, the mechanical vibration test refers to simulating the vehicle driving vibration by the vibration table 102 at a preset frequency, amplitude and acceleration to test the adsorption performance of the carbon canister 101 under a vibration environment. The temperature cycle test refers to controlling the temperature of the volatile oil and gas entering the carbon canister 101 within a preset temperature range by using the heat exchanger 105 and the temperature sensor to simulate the influence of different ambient temperatures on the adsorption performance of the carbon canister 101. The pressure cycle test refers to controlling the system pressure within a preset pressure range by means of the pressure regulating valve 113 to evaluate the adsorption effect of the carbon canister 101 under different pressure conditions.

[0070] Step S3 involves the gas measuring device 104 detecting the gas concentration data exiting the carbon canister 101 and transmitting the data to the control system. The gas measuring device 104 monitors the concentration of volatile gases in the gas exiting the carbon canister 101 in real time. This data provides a direct reflection of the carbon canister 101's adsorption performance. After receiving the gas concentration data, the control system processes and analyzes the data to determine key performance indicators for the carbon canister 101, including adsorption capacity, transient adsorption rate, and adsorption saturation time. Specifically, the adsorption capacity reflects the maximum amount of oil and gas that the carbon canister 101 can adsorb. This can be determined by calculating the change in oil and gas concentration before and after adsorption by the carbon canister 101, combined with the total volume of gas and the specifications of the carbon canister 101. The transient adsorption rate indicates the rate at which the carbon canister 101 adsorbs oil and gas per unit time and can be used to assess the carbon canister 101's ability to adsorb oil and gas in a short period of time. The transient adsorption rate can be determined by monitoring the changes in gas concentration at the outlet of the carbon canister 101 in real time, yielding a curve of adsorption capacity versus time. This curve, which is then used to determine the transient adsorption rate, is the amount of oil and gas adsorbed by the adsorbent per unit time. The adsorption saturation time refers to the time required for the carbon canister 101 to reach the adsorption saturation state, which helps to determine the effective working time of the carbon canister 101 in actual use. The adsorption saturation time can be obtained by monitoring the change of the oil and gas concentration at the outlet of the carbon canister 101 over time, and then determining the time required for the carbon canister 101 to reach a stable value from the beginning of adsorption to the oil and gas concentration at the outlet of the carbon canister 101.

[0071] The solution of this application can comprehensively and accurately evaluate the performance of the carbon canister under different working conditions through the above three-step testing process, providing strong data support for the design optimization and performance improvement of the carbon canister and meeting the requirements of relevant emission regulations.

[0072] In another specific embodiment, butane is introduced into the carbon canister 101 to perform a volatile organic compound test on the carbon canister 101. Specifically, the difference between this embodiment and the above embodiment lies in step S1. Step S1 in this embodiment involves opening the second air intake line 109 and introducing air or nitrogen into the carbon canister 101 to simulate the gas flow conditions under the engine desorption condition. In addition, it is necessary to open the third air intake line 110 and inject butane gas with an adjustable concentration into the carbon canister 101 to ensure that the test medium is fully consistent with regulatory requirements. The remaining steps are the same as the above embodiment.

[0073] like Figure 3 As shown, in a specific embodiment, the detection of desorption performance includes the following steps:

[0074] S4, shut down the fuel system and control the air intake system to deliver gas to the carbon canister;

[0075] S5. Performing a test on the carbon canister, wherein the test includes at least one of the mechanical vibration test, the temperature cycle test, and the pressure cycle test;

[0076] S6. During the desorption process, the mixed gas discharged from the carbon canister is introduced into the condenser for complete condensation. The condensed liquid fuel is separated by the gas-liquid separator and returned to the fuel system. The separated gas enters the gas measuring device to measure the concentration data and transmit the data to the control system. The control system processes the data to obtain the desorption residue of the carbon canister.

[0077] In this solution, when testing the desorption performance of the carbon canister, the following steps are performed in sequence:

[0078] Step S4: Control the second air intake line 109 to deliver air or nitrogen filtered by the filter 114 to the carbon canister 101 . These gases act as a purge during the desorption process, helping to desorb the oil and gas adsorbed in the carbon canister 101 from the carbon canister 101 .

[0079] Next, step S5 is performed. This step is identical to step S2 in the adsorption process described above, namely, the carbon canister 101 is subjected to at least one of a mechanical vibration test, a temperature cycle test, and a pressure cycle test. These tests are intended to simulate various complex operating conditions that the carbon canister 101 may encounter in actual use, thereby evaluating the stability and reliability of its desorption performance under various environmental conditions.

[0080] Step S6: The mixed gas desorbed from the carbon canister 101 is introduced into the condenser 106 for complete condensation. The function of the condenser 106 is to cool the gaseous fuel components in the mixed gas and convert them into liquid. The condensed liquid fuel then flows into the gas-liquid separator 107, where it is separated from the uncondensed gaseous components. The separated liquid fuel flows back to the fuel system through the pipeline to achieve resource recycling. The separated gaseous components enter the gas measuring device 104, which can measure the concentration data of these gases and transmit the data to the control system in real time. After receiving these data, the control system processes and analyzes them to calculate the desorption efficiency and desorption residue of the carbon canister 101.

[0081] Those skilled in the art will appreciate that in the above scheme, the steps are not strictly sequential; some steps can be performed simultaneously, and the order can be flexibly adjusted. For example, when testing desorption performance, steps S5 and S6 can be performed simultaneously. In actual operation, step S5 can be performed first and then step S4, depending on the specific situation, to meet testing requirements.

[0082] The scheme of this application can obtain key performance indicators such as desorption efficiency and desorption residue of the carbon canister 101 under different working conditions through the steps recorded in this scheme, providing strong data support for the design optimization, performance improvement and compliance with relevant emission regulations of the carbon canister 101.

[0083] In another specific embodiment, when the carbon canister 101 is subjected to a volatile organic compound test, the desorption process of the carbon canister 101 is identical to the above steps S4 to S6 and will not be further elaborated herein.

[0084] It is worth noting that during the actual adsorption test, when the system detects that the carbon canister 101 is saturated with adsorption through the hydrogen flame ionization detector (FID), a phased operation will be performed. Specifically, the first phase is the delayed shutdown of the fuel supply. The fuel supply is maintained for a preset duration to ensure that the adsorption front inside the carbon canister 101 reaches a dynamic steady state (eliminating concentration gradient fluctuations). At this time, the excess oil and gas that cannot be adsorbed is continuously discharged from the outlet of the carbon canister 101. This is followed by the condensation recovery phase. The discharged oil and gas first enter the condenser 106 and are converted into a mixture of liquid fuel and trace amounts of uncondensed gas. The mixture is transported to the gas-liquid separator 107 for phase separation. The liquid fuel is returned to the fuel system for recycling and reuse; the gaseous residue is transported to the gas measurement device 104 for real-time monitoring of concentration and flow rate to provide data support for adsorption capacity calculation. After completing the above operations, the fuel system is shut down and the oil and gas supply is stopped. The desorption detection program is simultaneously switched to, and hot nitrogen is introduced into the carbon canister 101 to initiate desorption.

[0085] It is also worth noting that in this solution, both the adsorption and desorption testing processes of the carbon canister 101 support dynamic environmental simulation. This means that independent temperature and pressure control devices can adjust the system temperature and pressure in real time to accurately replicate the vehicle's actual operating conditions. The specific timing of temperature and pressure adjustments (such as pre-cooling before adsorption and pressurization during desorption) is dynamically defined by test requirements. This solution is not fixed to a single operating step, retaining the flexibility to respond to different test standards (such as the GB18352.6 day and night test and the US EPA heat soak test).

[0086] In a specific embodiment, the durability of the carbon canister 101 during long-term use is evaluated by combining the butane adsorption efficiency decline curve and the temperature rise effect data in multiple cycle tests.

[0087] In this solution, when the carbon canister 101 is subjected to volatile organic compound tests multiple times, the adsorption efficiency of each cycle is recorded, and a curve showing the change in adsorption efficiency with the number of cycles is drawn, i.e., a butane adsorption efficiency decline curve. This curve can intuitively reflect the changing trend of the adsorption efficiency of the carbon canister 101 during long-term use. The durability of the carbon canister 101 is evaluated by analyzing the downward trend of the curve. For example, if the curve declines gently, it indicates that the adsorption performance of the carbon canister 101 in long-term use is relatively stable and has good durability. On the contrary, if the curve declines rapidly, it means that the adsorption performance of the carbon canister 101 in long-term use may decline significantly and its durability is poor.

[0088] In a specific implementation scheme, multiple carbon canisters 101 are placed on the same vibration table 102, and the same temperature, pressure and oil and gas concentration test conditions are provided to each carbon canister 101 through independent gas pipelines and pressure regulating valves 113, so that multi-condition comprehensive tests are performed synchronously.

[0089] In this solution, multiple carbon canisters 101 are placed simultaneously on a common vibration table 102 in the test setup. This vibration table 102 provides a uniform mechanical vibration environment for all carbon canisters 101, simulating the vibration conditions experienced during vehicle operation. This ensures that each carbon canister 101 experiences the same vibration frequency, amplitude, and acceleration during testing, thereby ensuring consistency and comparability of test results.

[0090] Regarding the gas supply system, each canister 101 is equipped with independent gas piping and pressure regulators. This design allows for precise control of the gas parameters entering each canister 101, including temperature, pressure, and oil / gas concentration. Although the gas piping is independent, it is connected to a common gas supply and control system, ensuring that each canister 101 receives the same gas conditions.

[0091] For data collection and analysis, the test data of each carbon canister 101 (including adsorption efficiency, desorption performance, durability, etc.) is independently collected and recorded, and then transmitted to the central control system for analysis and processing to evaluate the performance of each carbon canister 101.

[0092] In terms of working condition simulation, by precisely controlling parameters such as temperature, pressure and oil and gas concentration in the gas pipeline, various working conditions that may be encountered in the actual use of the carbon canister 101 can be simulated, such as temperature changes under different climatic conditions, pressure changes at different altitudes, and oil and gas concentration changes under different driving conditions.

[0093] Furthermore, the system has test flexibility. Although the test conditions are the same, special tests can be performed on individual carbon canisters 101 or test parameters can be adjusted to meet specific research or development needs.

[0094] In summary, this solution achieves simultaneous execution of comprehensive testing under multiple operating conditions by placing multiple carbon canisters 101 on the same vibration table 102 and providing each canister 101 with an independent gas pipeline and pressure regulating valve 113. This not only improves testing efficiency but also ensures the consistency and accuracy of test results, providing strong support for performance evaluation and durability analysis of carbon canisters 101.

[0095] The detection method provided in this application comprehensively evaluates the performance of the carbon canister under different environmental stresses by simultaneously performing comprehensive tests on multiple working conditions. Based on the precise closed-loop control of temperature, pressure and oil and gas concentration in the gas pipeline, the system can simulate the actual vehicle operating conditions (such as day and night temperature differences, altitude pressure changes) with high fidelity, so that the deviation between the test results and the actual usage scenarios is small. In addition, the adsorption efficiency, desorption performance and durability data generated by the test provide the core basis for carbon canister design optimization and quality control, significantly improving product reliability and service life.

[0096] Although multiple embodiments of the present application have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art can conceive of many changes, modifications, and alternatives without departing from the thought and spirit of the present application. It should be understood that in the process of practicing the present application, various alternatives to the embodiments of the present application described herein can be adopted. The accompanying claims are intended to define the scope of protection of the present application and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A carbon canister performance detection device, characterized in that: include: a vibration table, carrying at least one carbon canister and capable of applying mechanical vibration to the carried carbon canister; a fuel system connected to the carbon canister and used to transport volatile oil and gas into the carbon canister; a gas measuring device connected to the carbon canister and used to monitor the gas concentration during the adsorption or desorption process of the carbon canister; as well as A control system is communicatively connected with the vibration table, the fuel system and the gas measuring device, and is used to process received data and issue control instructions.

2. The device according to claim 1, characterized in that Also included is a temperature control device connected to the fuel system and the control system; The temperature control device includes a heat exchanger and a temperature sensor, wherein the temperature sensor is arranged at the position of the gas outlet of the heat exchanger, and the heat exchanger is connected to the carbon canister and adjusts the temperature of the gas entering the carbon canister.

3. The device according to claim 2, characterized in that Also included is a pressure control device in communication with the control system; The pressure control device includes a pressure regulator and a pressure sensor, wherein the pressure sensor is arranged in the carbon canister, and the pressure regulator is arranged on the communication pipeline between the gas measuring device and the carbon canister.

4. The device according to any one of claims 1 to 3, characterized in that It also includes a condenser; the condenser is connected to the gas outlet end of the carbon canister and is connected to the fuel system in an on-off manner.

5. The device according to claim 4, characterized in that It also includes a gas-liquid separator, which is connected to the condenser, the gas measuring device and the fuel system respectively.

6. The device according to claim 1, characterized in that The air inlet of the carbon canister is also connected to a filter, and the filter is used to filter impurities in the gas entering the carbon canister.

7. A method for testing the performance of a carbon canister using the device according to any one of claims 1 to 6, characterized in that: The adsorption performance test includes the following steps: S1. Control the fuel system to deliver volatile oil or butane into the carbon canister; S2. Perform at least one of the following tests on the carbon canister: Mechanical vibration test: simulate vehicle driving vibration by using a vibration table at preset frequency, amplitude and acceleration; Temperature cycle test: The gas temperature is controlled within a preset temperature range through a heat exchanger and a temperature sensor; Pressure cycle test: The system pressure is controlled within the preset pressure range through the pressure regulating valve; S3. The gas measuring device detects the gas concentration data discharged from the carbon canister and transmits the data to the control system. The control system processes the data to obtain the adsorption capacity, transient adsorption rate and adsorption saturation time of the carbon canister.

8. The method according to claim 7, characterized in that The desorption performance test includes the following steps: S4, shut down the fuel system and control the air intake system to deliver gas to the carbon canister; S5. Performing a test on the carbon canister, wherein the test includes at least one of the mechanical vibration test, the temperature cycle test, and the pressure cycle test; S6. During the desorption process, the mixed gas discharged from the carbon canister is introduced into the condenser for complete condensation. The condensed liquid fuel is separated by the gas-liquid separator and returned to the fuel system. The separated gas enters the gas measuring device to measure the concentration data and transmit the data to the control system. The control system processes the data to obtain the desorption residue of the carbon canister.

9. The method according to claim 8, characterized in that The durability of the carbon canister during long-term use is evaluated by combining the butane adsorption efficiency decline curve and temperature rise effect data from multiple cycle tests.

10. The method according to any one of claims 7 to 9, characterized in that: Multiple carbon canisters are placed on the same vibration table, and independent gas pipelines and pressure regulating valves are used to provide each carbon canister with the same temperature, pressure and oil and gas concentration test conditions, so that multi-condition comprehensive tests can be performed simultaneously.

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