EGR cooler thermal performance test system and test method

Abstract

The present invention discloses an EGR cooler thermal performance test system and a test method thereof, which relate to the technical field of cooler testing, and solve the problem that the current EGR cooler thermal performance test method cannot simulate real working conditions, resulting in deviations between test data and actual use, and cannot fully reflect the comprehensive performance of the EGR cooler. The system includes a sealing test module, a heat exchange capacity evaluation module, a heat transfer efficiency analysis module, a thermal response analysis module and a thermal performance identification module. The sealing test module is used to test the sealing of the cooler, the heat exchange capacity evaluation module is used to evaluate the heat exchange capacity of the cooler, the heat transfer efficiency analysis module is used to analyze the heat transfer efficiency of the cooler, the thermal response analysis module is used to analyze the thermal response time of the cooler, and the thermal performance identification module is used to identify the thermal performance of the cooler. The present invention realizes comprehensive testing of the thermal performance of the EGR cooler.

Description

Technical Field

[0001] The invention belongs to the technical field of cooler testing, in particular to an EGR cooler thermal performance testing system and a testing method thereof. Background Art

[0002] The EGR cooler is a critical component in a vehicle's exhaust system, primarily responsible for reducing the temperature of exhaust gases entering the engine's intake system. By recirculating a portion of the exhaust gas back into the engine's combustion chamber and mixing it with fresh air, the EGR cooler reduces nitrogen oxide emissions and improves engine combustion efficiency. The EGR cooler utilizes coolant in the engine's cooling system to absorb heat from the exhaust gas, lowering its temperature and enabling more efficient exhaust gas recirculation and improved emissions control. Its performance directly impacts the engine's combustion stability, emissions levels, and fuel economy. Therefore, the EGR cooler's thermal performance, heat exchange capacity, and response time are crucial for automotive emissions control and engine optimization.

[0003] In the existing technology, the thermal performance test of the EGR cooler is carried out under standardized and idealized experimental conditions, which cannot simulate the working conditions of the EGR cooler under real working conditions, resulting in a deviation between the test data and actual use. In addition, the existing evaluation of EGR cooler performance often relies on a single parameter and cannot fully reflect the comprehensive performance of the EGR cooler.

[0004] To this end, the present invention proposes an EGR cooler thermal performance testing system and a testing method thereof. Summary of the Invention

[0005] The purpose of the present invention is to provide an EGR cooler thermal performance testing system and a testing method thereof to solve the problems raised in the above background technology.

[0006] The technical problems to be solved by the present invention are:

[0007] How to achieve comprehensive testing of the thermal performance of EGR coolers.

[0008] In the first aspect, in order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0009] The EGR cooler thermal performance test system is characterized by comprising a sealing test module, a heat exchange capacity evaluation module, a heat transfer efficiency analysis module, a data acquisition module, a thermal response analysis module, a thermal performance identification module, a database module, a display module and a main control center, wherein the sealing test module is used to test the sealing of the cooler, and the cooler sealing test result obtained by the test is sent to the main control center; if the received cooler sealing test result is qualified, a data acquisition instruction is generated and loaded into the database module and the data acquisition module; if the received cooler sealing test result is unqualified, a test failure signal is generated and sent to the display module, and the display module is used to display the test failure signal corresponding to the cooler;

[0010] The database module is used to store the standard test data of the cooler and the standard thermal response time of the cooler; the heat exchange capacity evaluation module is used to evaluate the heat exchange capacity of the cooler, and send the heat exchange capacity index of the cooler obtained by the evaluation to the thermal performance evaluation module through the main control center;

[0011] The data acquisition module is used to obtain real-time test data during the cooler test and send it to the heat transfer efficiency analysis module and the thermal response analysis module; the heat transfer efficiency analysis module is used to analyze the heat transfer efficiency of the cooler, and the heat exchange efficiency index of the cooler obtained by analysis is sent to the thermal performance evaluation module through the main control center;

[0012] The thermal response analysis module is used to analyze the thermal response time of the cooler, and send the thermal response time index of the cooler obtained by analysis to the thermal performance identification module through the main control center; the thermal performance identification module is used to identify the thermal performance of the cooler, and send the identified thermal performance of the cooler to the display module through the main control center, and the display module is used to display the thermal performance of the cooler.

[0013] Furthermore, the testing process of the sealing test module is as follows:

[0014] Inject helium into the cooler and pressurize the helium inside the cooler to a preset test pressure;

[0015] Obtain the helium concentration threshold in the standard test environment, use the seams outside the cooler as sampling points, and then detect the helium concentration at all sampling points;

[0016] If the helium concentration at any sampling point is greater than the helium concentration threshold in the standard test environment, the seal test result of the cooler is judged to be unqualified;

[0017] If the helium concentration at all collection points is less than or equal to the helium concentration threshold in the standard test environment, the ultrasonic signal strength outside the cooler is detected. When the ultrasonic signal strength outside the cooler is less than the signal strength threshold, the sealing test result of the cooler is determined to be qualified. When the ultrasonic signal strength outside the cooler is greater than or equal to the signal strength threshold, the sealing test result of the cooler is determined to be unqualified.

[0018] Furthermore, the standard test data include the heat exchange area of ​​the cooler and the specific heat capacity of the cooling medium used in the cooler to absorb the heat of the gas, the standard cooling medium flow rate used by the cooler within a fixed time, the standard gas flow rate passing through the cooler within a fixed time, the gas specific heat capacity corresponding to the gas cooled by the cooler, the standard heat exchange efficiency between the gas and the cooling medium in the cooler, the standard gas input temperature and the standard cooling medium input temperature of the cooler.

[0019] Furthermore, the evaluation process of the heat exchange capacity evaluation module is as follows:

[0020] Obtain the standard heat exchange efficiency between the gas and the cooling medium in the cooler, the standard gas input temperature, the standard cooling medium input temperature, and the cooler heat exchange area of ​​the cooler, and calculate the cooler standard heat absorption value of the cooler;

[0021] Then, the standard gas flow rate and gas specific heat capacity passing through the cooler within a fixed time are obtained, and the standard gas output temperature of the cooler is calculated.

[0022] Furthermore, the evaluation process of the heat exchange capacity evaluation module further includes:

[0023] Obtain the specific heat capacity of the cooling medium used to absorb gas heat in the cooler and the standard cooling medium flow rate passing through the cooler within a fixed time, and calculate the cooling medium temperature difference between the standard cooling medium output temperature and the standard cooling medium input temperature output by the cooler;

[0024] The standard gas input temperature is subtracted from the standard gas output temperature to obtain the gas temperature drop value, and then the heat exchange capacity index of the cooler is calculated.

[0025] Furthermore, the analysis process of the thermal response analysis module is as follows:

[0026] Construct a thermal response analysis scenario. Specifically, the cooling medium input temperature in the cooler is set to the test medium input temperature, and the cooling medium flow rate used by the cooler within a fixed time is set to the standard cooling medium flow rate.

[0027] Set the gas output temperature threshold. When the real-time gas output temperature drops to the gas output temperature threshold, and the temperature fluctuation value of the real-time gas output temperature falls within the temperature fluctuation range and lasts for the preset time, record the test gas cooling time and the real-time gas output temperature corresponding to each time node during the gas cooling;

[0028] Similarly, the test gas cooling time corresponding to the cooler at different test medium input temperatures is obtained;

[0029] Traverse and compare the test gas cooling time corresponding to the cooler at different test medium input temperatures to obtain the minimum value of the test gas cooling time, and use the minimum value of the test gas cooling time as the gas cooling time corresponding to the cooler;

[0030] The standard thermal response time of the cooler is obtained, and the gas cooling time of the cooler is divided by the standard thermal response time to obtain the thermal response time index of the cooler.

[0031] Furthermore, the real-time test data includes the real-time gas input temperature, the real-time cooling medium input temperature, the real-time gas output temperature and the real-time cooling medium output temperature of the cooler.

[0032] Furthermore, the analysis process of the heat transfer efficiency analysis module is as follows:

[0033] Obtain the real-time gas input temperature, real-time gas output temperature, gas specific heat capacity (BRR), and standard gas flow rate through the cooler within a fixed time during the cooler test, and calculate the actual heat release value of the cooler gas;

[0034] Obtain the specific heat capacity of the cooling medium used to absorb gas heat in the cooler, the standard cooling medium flow rate used by the cooler within a fixed time, the real-time cooling medium input temperature, and the real-time cooling medium output temperature, and calculate the actual heat absorption value of the cooling medium in the cooler;

[0035] Divide the actual heat absorption value of the cooling medium by the actual heat release value of the gas to obtain the actual heat exchange efficiency of the cooler;

[0036] Increase the standard cooling medium flow rate in the cooler at a fixed flow rate, repeat the above steps, and obtain the real-time cooling medium output temperature and real-time gas output temperature in the cooler at the next cooling medium flow rate, and so on, until the standard cooling medium flow rate reaches the upper limit of the cooling medium flow rate of the cooler;

[0037] Similarly, the standard cooling medium flow rate in the cooler is reduced downward at a fixed flow rate until the cooling medium flow rate reaches the cooling medium flow lower limit value of the cooler;

[0038] Repeat the above steps to obtain the actual heat exchange efficiency of the cooler under different cooling medium flow rates;

[0039] The actual heat exchange efficiency curve of the cooler is plotted with the actual heat exchange efficiency as the Y-axis and the cooling medium flow rate as the X-axis. The maximum value of the actual heat exchange efficiency of the cooler under different cooling medium flow rates is obtained through the actual heat exchange efficiency curve, and the maximum value of the actual heat exchange efficiency is used as the heat exchange efficiency index XLZ of the cooler.

[0040] Furthermore, the identification process of the thermal performance identification module is as follows:

[0041] Obtain the heat exchange capacity index, heat exchange efficiency index and thermal response time index of the cooler, and calculate the thermal performance index of the cooler;

[0042] When the thermal performance index of the cooler is greater than or equal to the first performance index threshold, the thermal performance of the cooler is determined to be excellent;

[0043] When the thermal performance index of the cooler is greater than or equal to the second performance index threshold and less than the first performance index threshold, the thermal performance of the cooler is determined to be general performance;

[0044] When the thermal performance index of the cooler is less than the second performance index threshold, the thermal performance of the cooler is determined to be unqualified; wherein the first performance index threshold is greater than the second performance index threshold, and the second performance index threshold is greater than zero.

[0045] In a second aspect, the present invention further proposes a method for testing the thermal performance of an EGR cooler, the method comprising:

[0046] Step S1, testing the sealing of the cooler. If the sealing test result of the cooler is unqualified, a test failure signal corresponding to the cooler is displayed. If the sealing test result of the cooler is qualified, a data acquisition instruction is generated.

[0047] Step S2, obtaining standard test data of the cooler and standard thermal response time of the cooler, and evaluating the heat exchange capacity of the cooler to obtain a heat exchange capacity index of the cooler;

[0048] Step S3, obtaining real-time test data during the cooler test, and analyzing the heat transfer efficiency of the cooler to obtain a heat exchange efficiency index of the cooler;

[0049] Step S4, analyzing the thermal response time of the cooler to obtain a thermal response time index of the cooler;

[0050] Step S5 , evaluating the thermal performance of the cooler according to the heat exchange capacity index, the heat exchange efficiency index, and the thermal response time index, to obtain the thermal performance of the cooler.

[0051] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0052] 1. The present invention first tests the sealing of the cooler. If the sealing test result of the cooler is unqualified, the test failure signal corresponding to the cooler is displayed. If the sealing test result of the cooler is qualified, further testing is performed to achieve preliminary detection of the cooler.

[0053] 2. The present invention obtains standard test data of the cooler and standard thermal response time of the cooler. On the one hand, it evaluates the heat exchange capacity of the cooler and obtains the heat exchange capacity index of the cooler. On the other hand, it obtains real-time test data during the cooler test and analyzes the heat transfer efficiency of the cooler to obtain the heat exchange efficiency index of the cooler. At the same time, it analyzes the thermal response time of the cooler to obtain the thermal response time index of the cooler. Finally, the thermal performance of the cooler is identified based on the heat exchange capacity index, the heat exchange efficiency index and the thermal response time index to obtain the thermal performance of the cooler. The present invention realizes a comprehensive test of the thermal performance of the EGR cooler. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0055] Figure 1 This is the overall system framework diagram of the present invention;

[0056] Figure 2 This is an example diagram of the actual heat exchange efficiency curve of the cooler in the present invention;

[0057] Figure 3 Flow chart of the method of the present invention. DETAILED DESCRIPTION

[0058] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0059] Example 1: Please refer to Figure 1 and Figure 2As shown, the technical solution provided by the present invention is: an EGR cooler thermal performance test system, including a sealing test module, a heat exchange capacity evaluation module, a heat transfer efficiency analysis module, a data acquisition module, a thermal response analysis module, a thermal performance identification module, a database module, a display module and a main control center, the database module is respectively connected to the heat exchange capacity evaluation module, the heat transfer efficiency analysis module and the thermal response analysis module, and the data acquisition module is respectively connected to the thermal response analysis module and the heat transfer efficiency analysis module;

[0060] In this embodiment, the sealing test module is used to test the sealing of the cooler. The testing process is as follows:

[0061] Inject helium into the cooler and pressurize the helium inside the cooler to a preset test pressure;

[0062] Obtain the helium concentration threshold in the standard test environment, use the seams outside the cooler as sampling points, and then detect the helium concentration at all sampling points;

[0063] The concentration threshold is the concentration of helium in a standard test environment, which is specifically standard atmospheric pressure, room temperature of 25°C, and humidity of 50%.

[0064] If the helium concentration at any collection point is greater than the helium concentration threshold in the standard test environment, the cooler sealing test result is determined to be unqualified; if the helium concentration at all collection points is less than or equal to the helium concentration threshold in the standard test environment, proceed to the next step;

[0065] Specifically, the helium concentration outside the cooler is detected by a mass spectrometer, which has extremely high sensitivity and can detect gas leaks in the cooler;

[0066] Detect the ultrasonic signal strength outside the cooler. If the ultrasonic signal strength outside the cooler is less than the signal strength threshold, the cooler sealing test result is determined to be qualified. If the ultrasonic signal strength outside the cooler is greater than or equal to the signal strength threshold, the cooler sealing test result is determined to be unqualified, and the cooler sealing test is stopped at this time.

[0067] The sealing test module sends the sealing test result of the cooler to the main control center. If the sealing test result of the cooler received by the main control center is qualified, a data acquisition instruction is generated and loaded into the database module and the data acquisition module. If the sealing test result of the cooler received by the main control center is unqualified, a test failure signal is generated and sent to the display module. The display module is used to display the test failure signal corresponding to the cooler.

[0068] Furthermore, the database module is used to store standard test data of the cooler, and the database module sends the standard test data to the heat exchange capacity evaluation module;

[0069] It should be specifically noted that the standard test data includes the heat exchange area of ​​the cooler and the specific heat capacity of the cooling medium used in the cooler to absorb heat from the gas, the standard cooling medium flow rate used by the cooler within a fixed time, the standard gas flow rate passing through the cooler within a fixed time, the gas specific heat capacity corresponding to the gas cooled by the cooler, the standard heat exchange efficiency between the gas and the cooling medium in the cooler, the standard gas input temperature and the standard cooling medium input temperature of the cooler;

[0070] In a specific implementation, the cooling medium may be water or coolant; the gas cooled by the cooler is exhaust gas recirculation gas, and in this embodiment, the gas is nitrogen oxides;

[0071] The heat exchange capacity evaluation module is used to evaluate the heat exchange capacity of the cooler. The evaluation process is as follows:

[0072] Obtain the standard heat exchange efficiency JHB between the gas and the cooling medium in the cooler, the standard gas input temperature QTR, the standard cooling medium input temperature JWD, and the cooler heat exchange area HRM of the cooler, and calculate the cooler standard heat absorption value LFH of the cooler by the formula. The specific formula is as follows:

[0073] LFH=JHB×HRM×|QTR-JWD|;

[0074] Obtain the standard gas flow QTZ and gas specific heat capacity BRR passing through the cooler within a fixed time, and calculate the standard gas output temperature SCW output by the cooler using the formula. The formula is as follows:

[0075] SCW=QTR-[LFH / (QTZ×BRR)];

[0076] Then, the specific heat capacity LQR of the cooling medium used to absorb the heat of the gas in the cooler and the standard cooling medium flow rate LQZ passing through the cooler within a fixed time are obtained, and the cooling medium temperature difference JZC between the standard cooling medium output temperature and the standard cooling medium input temperature output by the cooler is calculated by the formula. The specific formula is as follows:

[0077] JZC=LFH / (LQZ×LQR);

[0078] Subtract the standard gas output temperature from the standard gas input temperature to obtain the gas temperature reduction value JDZ. The heat exchange capacity index NLZ of the cooler is calculated by the formula. The specific formula is as follows:

[0079] NLZ=w1×LFH+w2×JDZ+w3×JZC, where w1, w2, and w3 are weight coefficients with fixed values, and w1>w2>w3>0;

[0080] The heat exchange capacity evaluation module sends the heat exchange capacity index of the cooler to the main control center, and the main control center sends the heat exchange capacity index of the cooler to the thermal performance identification module.

[0081] As a further solution of the present invention, the data acquisition module is used to obtain real-time test data during the cooler test, and send the real-time test data to the heat transfer efficiency analysis module and the thermal response analysis module;

[0082] It should be specifically disclosed that the real-time test data are the real-time gas input temperature, real-time cooling medium input temperature, real-time gas output temperature and real-time cooling medium output temperature of the cooler;

[0083] The heat transfer efficiency analysis module is used to analyze the heat transfer efficiency of the cooler and obtain the stability of the cooler according to different working conditions. The analysis process of the heat transfer efficiency analysis module is as follows:

[0084] Obtain the real-time gas input temperature SQW, real-time gas output temperature SQC, gas specific heat capacity BRR, and standard gas flow rate QTZ passing through the cooler within a fixed time during the cooler test, and calculate the actual heat release value SJF of the cooler gas using the formula. The formula is as follows:

[0085] SJF=QTZ×BRR×|SQC-SQW|;

[0086] The actual heat release value of the gas is the heat released by the gas, and the unit is watt;

[0087] Obtain the specific heat capacity LQR of the cooling medium used to absorb gas heat in the cooler, the standard cooling medium flow rate LQZ used by the cooler within a fixed time, the real-time cooling medium input temperature SJW, and the real-time cooling medium output temperature SJC. Calculate the actual heat absorption value SJX of the cooling medium in the cooler using the formula. The specific formula is as follows:

[0088] SJX=LQZ×LQR×|SJC-SJW|;

[0089] Specifically, the actual heat absorption value of the gas is the heat released by the gas, and the unit is watt;

[0090] Divide the actual heat absorption value of the cooling medium by the actual heat release value of the gas to obtain the actual heat exchange efficiency of the cooler;

[0091] Increase the standard cooling medium flow rate in the cooler at a fixed flow rate, repeat the above steps, and obtain the real-time cooling medium output temperature and real-time gas output temperature in the cooler at the next cooling medium flow rate, and so on, until the standard cooling medium flow rate reaches the upper limit of the cooling medium flow rate of the cooler;

[0092] Similarly, the standard cooling medium flow rate in the cooler is reduced downward at a fixed flow rate until the cooling medium flow rate reaches the cooling medium flow lower limit value of the cooler;

[0093] like Figure 2 As shown, repeat steps R1-R3 to obtain the actual heat exchange efficiency of the cooler under different cooling medium flow rates;

[0094] The actual heat exchange efficiency curve of the cooler is plotted with the actual heat exchange efficiency as the Y-axis and the cooling medium flow rate as the X-axis. The maximum value of the actual heat exchange efficiency of the cooler under different cooling medium flow rates is obtained through the actual heat exchange efficiency curve, and the maximum value of the actual heat exchange efficiency is used as the heat exchange efficiency index XLZ of the cooler;

[0095] The heat transfer efficiency analysis module sends the heat exchange efficiency index of the cooler to the main control center, and the main control center sends the heat exchange efficiency index of the cooler to the thermal performance identification module.

[0096] Furthermore, the database module is further configured to store the standard thermal response time of the cooler, and the database module sends the standard thermal response time of the cooler to the thermal response analysis module; the thermal response analysis module is configured to test the thermal response time of the cooler, and the specific testing process is as follows:

[0097] Construct a thermal response analysis scenario, wherein the thermal response analysis scenario specifically includes: setting the cooling medium input temperature in the cooler to the test medium input temperature, and setting the cooling medium flow rate used by the cooler in a fixed time to the standard cooling medium flow rate;

[0098] Set the gas output temperature threshold. When the real-time gas output temperature drops to the gas output temperature threshold, and the temperature fluctuation value of the real-time gas output temperature falls within the temperature fluctuation range and lasts for the preset time, record the test gas cooling time and the real-time gas output temperature corresponding to each time node during the gas cooling;

[0099] It should be specifically noted that the time from when the gas is input into the cooler is taken as the initial time node, until the gas temperature drops to the gas output temperature threshold and lasts for a preset time, and the time node when the real-time gas output temperature first drops to the gas output temperature threshold is taken as the end time node, and the time elapsed from the start time node to the end time node is recorded as the test gas cooling time; wherein the preset time length is less than the test gas cooling time length;

[0100] Similarly, the test gas cooling time corresponding to the cooler at different test medium input temperatures is obtained;

[0101] Traverse and compare the test gas cooling time corresponding to the cooler at different test medium input temperatures to obtain the minimum value of the test gas cooling time, and use the minimum value of the test gas cooling time as the gas cooling time corresponding to the cooler;

[0102] Obtain the standard thermal response time of the cooler, divide the gas cooling time of the cooler by the standard thermal response time, and obtain the thermal response time index SCZ of the cooler;

[0103] Among them, when the thermal response time index is less than or equal to 1, it means that the thermal response time of the cooler is a normal response time. When the thermal response time index is greater than 1, it means that the thermal response time of the cooler is an abnormal response time.

[0104] The thermal response analysis module sends the thermal response time index of the cooler to the main control center, and the main control center sends the thermal response time index of the cooler to the thermal performance identification module.

[0105] In this embodiment, the thermal performance evaluation module is used to evaluate the thermal performance of the cooler. The evaluation process is as follows:

[0106] Obtain the heat exchange capacity index NLZ, heat exchange efficiency index XLZ and thermal response time index SCZ of the cooler, and calculate the thermal performance index RGX of the cooler through the formula. The specific formula is as follows:

[0107] RGX=(NLZ+XLZ) / SCZ;

[0108] When the thermal performance index of the cooler is greater than or equal to the first performance index threshold, the thermal performance of the cooler is determined to be excellent performance; when the thermal performance index of the cooler is greater than or equal to the second performance index threshold and less than the first performance index threshold, the thermal performance of the cooler is determined to be average performance; when the thermal performance index of the cooler is less than the second performance index threshold, the thermal performance of the cooler is determined to be unqualified performance;

[0109] wherein the first performance index threshold is greater than the second performance index threshold, and the second performance index threshold is greater than zero;

[0110] The thermal performance evaluation module sends the thermal performance of the cooler to the main control center, and the main control center sends the thermal performance of the cooler to the display module, and the display module is used to display the thermal performance of the cooler;

[0111] In practice, the display module includes but is not limited to a display screen, an electronic screen, and the like.

[0112] In this application, if a corresponding calculation formula appears, the above calculation formula is dimensionless and its numerical calculation is performed. The weight coefficient, proportional coefficient and other coefficients in the formula are set to a result value obtained by quantifying each parameter. Regarding the size of the weight coefficient and the proportional coefficient, as long as it does not affect the proportional relationship between the parameter and the result value, it is acceptable.

[0113] Example 2: Figure 3 As shown, based on another concept of the same invention, a method for testing the thermal performance of a cooler is proposed, comprising the following steps:

[0114] Step S1, testing the sealing of the cooler. If the sealing test result of the cooler is unqualified, a test failure signal corresponding to the cooler is displayed. If the sealing test result of the cooler is qualified, a data acquisition instruction is generated.

[0115] Step S2, obtaining standard test data of the cooler and standard thermal response time of the cooler, and evaluating the heat exchange capacity of the cooler to obtain a heat exchange capacity index of the cooler;

[0116] Step S3, obtaining real-time test data during the cooler test, and analyzing the heat transfer efficiency of the cooler to obtain a heat exchange efficiency index of the cooler;

[0117] Step S4, analyzing the thermal response time of the cooler to obtain a thermal response time index of the cooler;

[0118] Step S5 , evaluating the thermal performance of the cooler according to the heat exchange capacity index, the heat exchange efficiency index, and the thermal response time index, to obtain the thermal performance of the cooler.

[0119] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. EGR cooler thermal performance test system, characterized by: It includes a sealing test module, a heat exchange capacity evaluation module, a heat transfer efficiency analysis module, a data acquisition module, a thermal response analysis module, a thermal performance identification module, a database module, a display module and a main control center. The sealing test module is used to test the sealing of the cooler, and the sealing test result of the cooler is sent to the main control center. If the sealing test result of the cooler is qualified, a data acquisition instruction is generated and loaded into the database module and the data acquisition module. If the sealing test result of the cooler is unqualified, a test failure signal is generated and sent to the display module. The display module is used to display the test failure signal corresponding to the cooler; The database module is used to store the standard test data of the cooler and the standard thermal response time of the cooler; the heat exchange capacity evaluation module is used to evaluate the heat exchange capacity of the cooler, and send the heat exchange capacity index of the cooler obtained by the evaluation to the thermal performance evaluation module through the main control center; The data acquisition module is used to obtain real-time test data during the cooler test and send it to the heat transfer efficiency analysis module and the thermal response analysis module; the heat transfer efficiency analysis module is used to analyze the heat transfer efficiency of the cooler, and the heat exchange efficiency index of the cooler obtained by analysis is sent to the thermal performance evaluation module through the main control center; The thermal response analysis module is used to analyze the thermal response time of the cooler, and send the thermal response time index of the cooler obtained by analysis to the thermal performance identification module through the main control center; the thermal performance identification module is used to identify the thermal performance of the cooler, and send the identified thermal performance of the cooler to the display module through the main control center, and the display module is used to display the thermal performance of the cooler.

2. The EGR cooler thermal performance test system according to claim 1, characterized in that: The testing process of the sealing test module is as follows: Inject helium into the cooler and pressurize the helium inside the cooler to a preset test pressure; Obtain the helium concentration threshold in the standard test environment, use the seams outside the cooler as sampling points, and then detect the helium concentration at all sampling points; If the helium concentration at any sampling point is greater than the helium concentration threshold in the standard test environment, the seal test result of the cooler is judged to be unqualified; If the helium concentration at all collection points is less than or equal to the helium concentration threshold in the standard test environment, the ultrasonic signal strength outside the cooler is detected. When the ultrasonic signal strength outside the cooler is less than the signal strength threshold, the sealing test result of the cooler is determined to be qualified. When the ultrasonic signal strength outside the cooler is greater than or equal to the signal strength threshold, the sealing test result of the cooler is determined to be unqualified.

3. The EGR cooler thermal performance test system according to claim 2, characterized in that: The standard test data includes the heat exchange area of ​​the cooler and the specific heat capacity of the cooling medium used in the cooler to absorb the heat of the gas, the standard cooling medium flow rate used by the cooler within a fixed time, the standard gas flow rate passing through the cooler within a fixed time, the gas specific heat capacity corresponding to the gas cooled by the cooler, the standard heat exchange efficiency between the gas and the cooling medium in the cooler, the standard gas input temperature and the standard cooling medium input temperature of the cooler.

4. The EGR cooler thermal performance test system according to claim 3, characterized in that: The evaluation process of the heat exchange capacity evaluation module is as follows: Obtain the standard heat exchange efficiency between the gas and the cooling medium in the cooler, the standard gas input temperature, the standard cooling medium input temperature, and the cooler heat exchange area of ​​the cooler, and calculate the cooler standard heat absorption value of the cooler; Then, the standard gas flow rate and gas specific heat capacity passing through the cooler within a fixed time are obtained, and the standard gas output temperature of the cooler is calculated.

5. The EGR cooler thermal performance testing system according to claim 4, characterized in that: The evaluation process of the heat exchange capacity evaluation module further includes: Obtain the specific heat capacity of the cooling medium used to absorb gas heat in the cooler and the standard cooling medium flow rate passing through the cooler within a fixed time, and calculate the cooling medium temperature difference between the standard cooling medium output temperature and the standard cooling medium input temperature output by the cooler; The standard gas input temperature is subtracted from the standard gas output temperature to obtain the gas temperature drop value, and then the heat exchange capacity index of the cooler is calculated.

6. The EGR cooler thermal performance testing system according to claim 5, characterized in that: The analysis process of the thermal response analysis module is as follows: Construct a thermal response analysis scenario. Specifically, the cooling medium input temperature in the cooler is set to the test medium input temperature, and the cooling medium flow rate used by the cooler within a fixed time is set to the standard cooling medium flow rate. Set the gas output temperature threshold. When the real-time gas output temperature drops to the gas output temperature threshold, and the temperature fluctuation value of the real-time gas output temperature falls within the temperature fluctuation range and lasts for the preset time, record the test gas cooling time and the real-time gas output temperature corresponding to each time node during the gas cooling; Similarly, the test gas cooling time corresponding to the cooler at different test medium input temperatures is obtained; Traverse and compare the test gas cooling time corresponding to the cooler at different test medium input temperatures to obtain the minimum value of the test gas cooling time, and use the minimum value of the test gas cooling time as the gas cooling time corresponding to the cooler; The standard thermal response time of the cooler is obtained, and the gas cooling time of the cooler is divided by the standard thermal response time to obtain the thermal response time index of the cooler.

7. The EGR cooler thermal performance testing system according to claim 6, characterized in that: The real-time test data include the real-time gas input temperature, the real-time cooling medium input temperature, the real-time gas output temperature and the real-time cooling medium output temperature of the cooler.

8. The EGR cooler thermal performance testing system according to claim 7, characterized in that: The analysis process of the heat transfer efficiency analysis module is as follows: Obtain the real-time gas input temperature, real-time gas output temperature, gas specific heat capacity, and standard gas flow rate through the cooler within a fixed time during the cooler test, and calculate the actual heat release value of the cooler gas; Obtain the specific heat capacity of the cooling medium used to absorb gas heat in the cooler, the standard cooling medium flow rate used by the cooler within a fixed time, the real-time cooling medium input temperature, and the real-time cooling medium output temperature, and calculate the actual heat absorption value of the cooling medium in the cooler; Divide the actual heat absorption value of the cooling medium by the actual heat release value of the gas to obtain the actual heat exchange efficiency of the cooler; The standard cooling medium flow rate in the cooler is increased upward at a fixed flow rate to obtain the real-time cooling medium output temperature and the real-time gas output temperature in the cooler at the next cooling medium flow rate, and so on, until the standard cooling medium flow rate reaches the upper limit of the cooling medium flow rate of the cooler; Similarly, the standard cooling medium flow rate in the cooler is reduced downward at a fixed flow rate until the cooling medium flow rate reaches the cooling medium flow lower limit value of the cooler; Repeat the above steps to obtain the actual heat exchange efficiency of the cooler under different cooling medium flow rates; The actual heat exchange efficiency curve of the cooler is plotted with the actual heat exchange efficiency as the Y-axis and the cooling medium flow rate as the X-axis. The maximum value of the actual heat exchange efficiency of the cooler under different cooling medium flow rates is obtained through the actual heat exchange efficiency curve, and the maximum value of the actual heat exchange efficiency is used as the heat exchange efficiency index of the cooler.

9. The EGR cooler thermal performance testing system according to claim 8, characterized in that: The identification process of the thermal performance identification module is as follows: Obtain the heat exchange capacity index, heat exchange efficiency index and thermal response time index of the cooler, and calculate the thermal performance index of the cooler; When the thermal performance index of the cooler is greater than or equal to the first performance index threshold, the thermal performance of the cooler is determined to be excellent; When the thermal performance index of the cooler is greater than or equal to the second performance index threshold and less than the first performance index threshold, the thermal performance of the cooler is determined to be general performance; When the thermal performance index of the cooler is less than the second performance index threshold, the thermal performance of the cooler is determined to be unqualified; wherein the first performance index threshold is greater than the second performance index threshold, and the second performance index threshold is greater than zero.

10. EGR cooler thermal performance test method, characterized in that: Based on the EGR cooler thermal performance testing system according to any one of claims 1 to 9, the method includes: Step S1, testing the sealing of the cooler. If the sealing test result of the cooler is unqualified, a test failure signal corresponding to the cooler is displayed. If the sealing test result of the cooler is qualified, a data acquisition instruction is generated. Step S2, obtaining standard test data of the cooler and standard thermal response time of the cooler, and evaluating the heat exchange capacity of the cooler to obtain a heat exchange capacity index of the cooler; Step S3, obtaining real-time test data during the cooler test, and analyzing the heat transfer efficiency of the cooler to obtain a heat exchange efficiency index of the cooler; Step S4, analyzing the thermal response time of the cooler to obtain a thermal response time index of the cooler; Step S5 , evaluating the thermal performance of the cooler according to the heat exchange capacity index, the heat exchange efficiency index, and the thermal response time index, to obtain the thermal performance of the cooler.

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