A method, system and device for environmental temperature durability testing of a new energy transmission

Abstract

The application provides a kind of new energy transmission environmental temperature endurance test method, system and equipment, the method includes obtaining test data table, the data in test data table is analyzed and calculated to obtain a plurality of conversion data, transmission environmental temperature curve of design test bench test condition and inverter import water temperature temperature curve are calculated, and the total cycle number of test bench test condition is calculated, every test driving condition is cut into pieces, to obtain slice condition database, according to the inverter import water temperature data of test bench, the inverter temperature rise data set of every slice condition in slice condition database is replaced, based on the slice condition database after replacement, iteration calculation is carried out, to determine the slice condition of input test bench, by the setting, the high temperature aging endurance verification and temperature change endurance verification of electronic components can be met, and the working environment of new energy transmission under actual working condition is greatly restored, to avoid over-verification or insufficient verification of transmission electronic components.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy transmission testing, and in particular relates to a new energy transmission environmental temperature endurance test method, system and device. BACKGROUND

[0002] With the development of new energy vehicles, the proportion of electronic components used in new energy vehicles is also gradually increasing. For a transmission, a new energy transmission adopts a multi-in-one architecture, which increases electric components such as motors and inverters compared to a traditional transmission. Unlike the traditional transmission endurance verification, the new energy transmission not only needs to test the mechanical structure endurance, but also needs to consider the environmental temperature endurance of electronic components. For example, the inverter contains a large number of electronic components, the temperature of which is easily affected by the environmental temperature and the cooling water temperature. In particular, the temperature of the power module changes dramatically under the peak working condition of the motor, which easily causes temperature fatigue endurance failure of the electronic components. Therefore, how to design an environmental temperature endurance load spectrum for the verification of electronic components during the development of a new energy transmission is very important.

[0003] In the prior art, a new energy transmission manufacturer tests the new energy transmission by referring to the ISO-16750 standard or the VW-80000 standard. The VW-80000 standard defines the environmental temperature and the cooling water temperature of the transmission, but does not regulate the working load of the electronic components. The electrical load of the ISO-16750 standard is not related to the design parameters of the whole vehicle, for example, the electrical load cannot reflect the whole vehicle characteristic parameters such as the mass, the wind area, the wind resistance coefficient, the power of the motor, the battery, etc., and thus the environmental temperature endurance test load of the transmission cannot be accurately obtained.

[0004] Therefore, the existing test standards for new energy transmissions cannot accurately obtain the environmental temperature endurance test load of the new energy transmission. SUMMARY

[0005] Therefore, the present application aims to provide a new energy transmission environmental temperature endurance test method, system and device to solve the technical problem that the existing test standards for new energy transmissions cannot accurately obtain the environmental temperature endurance test load of the transmission.

[0006] The first aspect of the present application provides a new energy transmission environmental temperature endurance test method, which is applied to a test bench for testing a new energy transmission. The test method comprises the following steps:

[0007] The new energy transmission is mounted on a whole vehicle for multiple test drives;

[0008] Obtaining multiple test data of each test driving condition to constitute a test data table, wherein the test data table includes a transmission ambient temperature data set and an inverter temperature rise data set;

[0009] Respectively analyzing and calculating data in the transmission ambient temperature data set and data in the inverter temperature rise data set to obtain multiple conversion data of the bench test condition;

[0010] Designing a transmission ambient temperature curve and an inverter inlet water temperature curve of the bench test condition based on the transmission ambient temperature data set, and calculating the total cycle number of the bench test condition;

[0011] Slicing and dividing each test driving condition to obtain a slice condition database;

[0012] Replacing the inverter temperature rise data set of each slice condition in the slice condition database according to the inverter inlet water temperature data of the bench;

[0013] Based on the replaced slice condition database, iterative calculation is performed to determine a suitable slice condition, and the suitable slice condition is input into the bench to test the target new energy transmission.

[0014] Further, the inverter temperature rise data set includes an inverter junction temperature data subset and an inverter junction temperature rain flow data subset;

[0015] In the step of respectively analyzing and calculating data in the transmission ambient temperature data set and data in the inverter temperature rise data set to obtain multiple conversion data of the bench test condition, the step includes:

[0016] Respectively analyzing and converting each ambient temperature data in the transmission ambient temperature data set, each junction temperature data in the inverter junction temperature data subset, and each junction temperature rain flow data in the inverter junction temperature rain flow data subset to obtain transmission ambient high-temperature aging endurance data, inverter junction temperature high-temperature aging endurance data, and inverter junction temperature temperature change equivalent damage data of the bench test condition;

[0017] The transmission ambient high-temperature aging endurance data, the inverter junction temperature high-temperature aging endurance data, and the inverter junction temperature temperature change equivalent damage data are all conversion data.

[0018] Further, each ambient temperature data in the transmission ambient temperature data set is analyzed and converted according to the following formula:

[0019]

[0020]

[0021] wherein, is an acceleration factor, is an activation energy of failure, is a Boltzmann constant, is a test temperature, is a transmission ambient temperature collected from the vehicle test, is a time corresponding to the transmission ambient temperature, is a transmission ambient high-temperature aging endurance data.

[0022] Further, each junction temperature data in the inverter junction temperature data subset is analyzed and converted according to the following formula:

[0023]

[0024]

[0025] wherein, is an acceleration factor, is an activation energy of failure, is a Boltzmann constant, is a test temperature, is an inverter junction temperature collected from the vehicle test, is a time corresponding to the inverter junction temperature, is an inverter junction high-temperature aging endurance data.

[0026] Further, each junction temperature rainflow data in the inverter junction temperature rainflow data subset is analyzed and converted according to the following formula:

[0027]

[0028]

[0029] wherein, is a stress is a cycle number of the sample causing fatigue fracture, is a stress suffered by the sample, is a nominal stress of the sample, is a negative reciprocal of the SN curve slope of the sample, is a stress is a cycle number on the corresponding SN curve, is a temperature change difference of the electronic component actually collected, is an inverter junction temperature change endurance equivalent damage data.

[0030] Further, in the step of iteratively calculating based on the replacement of the slice working condition database to determine a suitable slice working condition, comprising:

[0031] The sum of the inverter junction temperature high temperature aging endurance data of each of the plurality of slice working conditions is combined with the sum of each of the junction temperature data to perform percentage calculation to obtain a junction temperature calculation result, wherein the inverter junction temperature high temperature aging endurance data is the inverter junction temperature high temperature aging endurance data of the test bench, and the junction temperature data is the inverter junction temperature high temperature aging endurance data of the whole vehicle in the test driving working condition;

[0032] The sum of the inverter junction temperature temperature change endurance equivalent damage data of each of the plurality of slice working conditions is combined with the sum of each of the junction temperature rain flow data to perform percentage calculation to obtain a junction temperature rain flow calculation result, wherein the inverter junction temperature temperature change endurance equivalent damage data is the inverter junction temperature temperature change endurance equivalent damage data of the test bench, and the junction temperature rain flow data is the inverter junction temperature temperature change endurance equivalent damage data of the whole vehicle in the test driving working condition;

[0033] The junction temperature calculation result and the junction temperature rain flow calculation result are compared with a pre-design calculation result respectively;

[0034] When the junction temperature calculation result and the junction temperature rain flow calculation result do not meet the pre-design calculation result, a slice working condition in the slice working condition database is selected N times, and iterative calculation is performed based on the plurality of slice working conditions selected each time, so that the Nth junction temperature calculation result and the Nth junction temperature rain flow calculation result corresponding to the Nth selection both meet the pre-design calculation result, and the slice working condition corresponding to the pre-design calculation result is input into the test bench to test the target new energy transmission.

[0035] Further, after the step of comparing the junction temperature calculation result and the junction temperature rain flow calculation result with the pre-design calculation result respectively, it further includes:

[0036] When the Nth junction temperature calculation result and the Nth junction temperature rain flow calculation result corresponding to the Nth selection do not meet the pre-design calculation result;

[0037] The inverter temperature rise data actually measured by the whole vehicle is adjusted by increasing / deleting, so that the inverter inlet water temperature data of the test bench is adjusted;

[0038] The inverter temperature rise data set of each of the slice working conditions in the slice working condition database is replaced based on the adjusted inverter inlet water temperature data of the test bench;

[0039] The slice working condition in the slice working condition database is selected again based on the replacement, so that the N+1th junction temperature calculation result and the N+1th junction temperature rain flow calculation result corresponding to the N+1th selection both meet the pre-design calculation result, and the slice working condition corresponding to the pre-design calculation result is input into the test bench to test the target new energy transmission.

[0040] Further, in the step of acquiring a plurality of test data of each test driving condition to constitute a test data table, further comprising:

[0041] Linearly extrapolating the plurality of test data to obtain a durability target of the whole life cycle.

[0042] The second aspect of the present application provides a kind of environmental temperature durability test system of new energy transmission, the system includes:

[0043] Test driving module, for being carried on new energy transmission in whole vehicle and carrying out multiple test driving;

[0044] Acquisition module, for acquiring a plurality of test data of each test driving condition to constitute a test data table, wherein the test data table includes transmission environmental temperature data set and inverter temperature rise data set;

[0045] Analysis and calculation module, for analyzing and calculating the data in the transmission environmental temperature data set and the data in the inverter temperature rise data set respectively, to obtain a plurality of conversion data of bench test condition;

[0046] Cycle number calculation module, for designing transmission environmental temperature curve and inverter import water temperature curve of bench test condition based on the transmission environmental temperature data set, and calculating the total cycle number of bench test condition;

[0047] Slicing module, for slicing segmentation to each test driving condition, to acquire slice condition database;

[0048] Replacement module, for replacing inverter temperature rise data set corresponding to each slice condition in the slice condition database according to the inverter import water temperature data of the bench;

[0049] Iterative calculation module, for iterative calculation based on the slice condition database after replacement, to determine suitable slice condition, and input suitable slice condition into the bench, to test target new energy transmission.

[0050] The third aspect of the present application provides a kind of environmental temperature durability test equipment of new energy transmission, including memory, processor and computer program stored in memory and can be run on processor, when processor executes program, realizes the environmental temperature durability test method of new energy transmission described above.

[0051] Compared with prior art, the environmental temperature durability test method, system and equipment of new energy transmission shown in the present application have the beneficial effects that:

[0052] In the environment temperature endurance test method of the new energy transmission provided by the application, the new energy transmission is first mounted on a whole vehicle to perform multiple test drives; multiple test data of each test driving condition are obtained to form a test data table, wherein the test data table includes a transmission environment temperature data set and an inverter temperature rise data set; then the data in the transmission environment temperature data set and the data in the inverter temperature rise data set are respectively analyzed and calculated to obtain multiple conversion data of a bench test condition; the transmission environment temperature curve and the inverter inlet water temperature curve of the bench test condition are designed based on the transmission environment temperature data set, and the total cycle number of the bench test condition is calculated; each test driving condition is segmented to obtain a slice condition database; the inverter temperature rise data set of each slice condition in the slice condition database is replaced according to the inverter inlet water temperature data of the bench; the replaced slice condition database is iteratively calculated to determine a suitable slice condition, and the suitable slice condition is input into the bench to test the target new energy transmission. Through the test method of the application, the slice condition obtained finally is the transmission environment temperature endurance test condition, so that the high-temperature aging endurance verification and the temperature change endurance verification of the electronic components can be met at the same time when the target new energy transmission is tested, and the designed condition greatly restores the working environment of the new energy transmission under the actual working condition of the whole vehicle, avoiding over-verification or insufficient verification of the transmission electronic components. BRIEF DESCRIPTION OF DRAWINGS

[0053] Figure 1 The flowchart of the environment temperature endurance test method of the new energy transmission in the first embodiment of the application;

[0054] Figure 2 The schematic diagram of the measured transmission environment temperature distribution of the whole vehicle test in the application;

[0055] Figure 3 The schematic diagram of the bench test environment temperature curve and the inverter inlet water temperature curve in the application;

[0056] Figure 4 The schematic diagram of the whole vehicle measured condition slicing in the application;

[0057] Figure 5 The schematic diagram of the design strategy of the bench environment temperature endurance condition in the application;

[0058] Figure 6 The schematic diagram of the environment temperature endurance test system of the new energy transmission in the second embodiment of the application;

[0059] Figure 7 The schematic diagram of the environment temperature endurance test equipment of the new energy transmission in the third embodiment of the application.

[0060] The following detailed description will further explain the present application with reference to the above mentioned drawings. DETAILED DESCRIPTION

[0061] For the purpose of promoting an understanding of the present application, the present application will be described with reference to the drawings. The present application is illustrated by a number of embodiments. However, the present application can be realized in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It will be apparent that the scope of the present application is not limited to the embodiments set forth herein.

[0062] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In addition, when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right", and the like as used herein are used for explanation purposes only.

[0063] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0064] First Embodiment

[0065] Referring to Figure 1 , a method for testing the environmental temperature durability of a new energy transmission is shown, the testing method is applied to a test bench for testing the new energy transmission, and the testing method specifically includes:

[0066] S01, the new energy transmission is mounted on a whole vehicle to perform multiple test drives.

[0067] It should be noted that in step S01, the transmission is mounted on the whole vehicle, and then several complete test cycles are run on the test site according to the requirements of the whole vehicle test specification.

[0068] S02, a plurality of test data of each test driving condition are obtained to form a test data table, wherein the test data table includes a transmission environmental temperature data set and an inverter temperature rise data set.

[0069] It should be noted that in some preferred embodiments, the test data table is not limited to the transmission environmental temperature data set and the inverter temperature rise data set, but can also include capacitance temperature signals, motor speed signals, motor torque signals, vehicle speed signals, etc.

[0070] In some preferred embodiments, the step of obtaining a plurality of test data of each test driving condition to form a test data table further comprises:

[0071] The plurality of test data is linearly extrapolated to obtain the durability target of the whole life cycle.

[0072] It should be noted that in the present embodiment, linear extrapolation of the plurality of test data can reduce the number of test cycles of the target vehicle, and the use of linear extrapolation technology enables test data of all conditions to be obtained in limited test driving conditions, achieving the purpose of saving resources.

[0073] S03, the data in the transmission ambient temperature data set and the data in the inverter temperature rise data set are analyzed and calculated respectively to obtain a plurality of conversion data of the bench test condition.

[0074] Specifically, the inverter temperature rise data set includes an inverter junction temperature data subset and an inverter junction temperature rain flow data subset;

[0075] In the step of analyzing and calculating the data in the transmission ambient temperature data set and the data in the inverter temperature rise data set respectively to obtain a plurality of conversion data of the bench test condition, the step includes:

[0076] Each ambient temperature data in the transmission ambient temperature data set, each junction temperature data in the inverter junction temperature data subset, and each junction temperature rain flow data in the inverter junction temperature rain flow data subset are analyzed and converted respectively to obtain transmission ambient high-temperature aging durability data, inverter junction temperature high-temperature aging durability data, and inverter junction temperature temperature change equivalent damage data of the bench test condition;

[0077] The transmission ambient high-temperature aging durability data, the inverter junction temperature high-temperature aging durability data, and the inverter junction temperature temperature change equivalent damage data are all conversion data.

[0078] Specifically, each ambient temperature data in the transmission ambient temperature data set is analyzed and converted according to the following formula:

[0079]

[0080]

[0081] In the formula, is an acceleration factor, is a failure activation energy, is a Boltzmann constant, is a test temperature, is a transmission ambient temperature collected by a whole vehicle test, is a time corresponding to the transmission ambient temperature, The high-temperature aging endurance data of the transmission environment.

[0082] It should be noted that in this formula, Figure 2 The temperature in table (a), Figure 2 The time in table (a) in the middle.

[0083] Each junction temperature data in the inverter junction temperature data subset is analyzed and converted according to the following formula:

[0084]

[0085]

[0086] In the formula, is the acceleration factor, is the failure activation energy, is the Boltzmann constant, is the test temperature, is the inverter junction temperature collected by the whole vehicle test, is the time corresponding to the inverter junction temperature, is the inverter junction temperature high-temperature aging endurance data.

[0087] It should be noted that in this formula, Figure 2 The temperature in table (b), Figure 2 The time in table (b) in the middle.

[0088] Each junction temperature rainflow data in the inverter junction temperature rainflow data subset is analyzed and converted according to the following formula:

[0089]

[0090]

[0091] In the formula, is the stress The number of cycles that causes the sample to fatigue fracture, is the stress suffered by the sample, is the nominal stress of the sample, is the negative reciprocal of the SN curve slope of the sample, is the stress The number of cycles on the SN curve corresponding to, is the actual collected temperature change difference of the electronic component, is the inverter junction temperature temperature change endurance equivalent damage data.

[0092] ​​​​It should be noted that in the analysis and conversion of each junction temperature data in the inverter junction temperature data set, the conventional finite element method needs to calculate the thermal stress of the inverter power module at each temperature, and then according to the temperature change rain flow fatigue ring, the stress fatigue ring corresponding to each temperature fatigue ring is calculated, and then the inverter junction temperature temperature change endurance equivalent damage data is calculated according to the stress fatigue ring. This conventional method involves finite element calculation, which is particularly time-consuming and is not conducive to the development of new energy transmission environmental temperature endurance working conditions.

[0093] Therefore, in the present application, a temperature change equivalent damage .

[0094] According to Wöhler's S-N fatigue theory,

[0095]

[0096]

[0097] In the formula, is the damage of the sample, is the actual cycle number of the sample under stress , is the cycle number on the SN curve corresponding to stress , is the cycle number of the sample under stress , is the stress suffered by the sample, is the nominal stress of the sample, is the negative reciprocal of the SN curve slope of the sample. Substitute into the expression of damage ,

[0098]

[0099] After sorting, we get

[0100]

[0101] For the temperature change fatigue stress

[0102]

[0103]

[0104] In the formula, is the actual temperature change difference of the electronic component, is the nominal temperature change difference of the electronic component, is a parameter related to the material and shape of the electronic component. Substitute and Substitution have to,

[0105]

[0106] The above formula shows that for the same electronic components... Since it is a nominal value, i.e. a constant value, let EDT = The expression for the thermal equivalent damage EDT is obtained.

[0107]

[0108] It should be noted that, For stress The corresponding number of cycles on the SN curve, that is Figure 2 The number of times in Table (c); The temperature difference of the nominal electronic components, that is Figure 2 The temperature difference between the maximum and minimum temperatures in Table (c).

[0109] S04. Based on the transmission ambient temperature dataset, design the transmission ambient temperature curve and inverter inlet water temperature curve for the bench test conditions, and calculate the total number of cycles for the bench test conditions.

[0110] It should be noted that the test data of the target vehicle are complex and variable, posing certain challenges to bench control. Furthermore, the full-vehicle test duration is lengthy, necessitating the acceleration of the test data to shorten the overall test time. Therefore, the full-vehicle test conditions need to be processed and converted into bench-operable conditions. The converted bench conditions shorten the test time while still meeting 100% of the durability target verification.

[0111] Specifically, the transmission ambient temperature profile of the test bench is set based on the highest and lowest ambient temperature data in the transmission ambient temperature dataset from step S01, for example... Figure 2 (a) The transmission ambient temperature curves of the test bench with the highest and lowest ambient temperatures.

[0112] In some preferred embodiments, the actual temperature control capability of the test bench also needs to be considered, that is, the inverter inlet water temperature measured in the whole vehicle in step S02 can be further used as a reference. Set the inverter inlet water temperature profile in the test bench, such as... Figure 3 As shown, the solid line represents the ambient temperature curve of the transmission on the test bench, and the dashed line represents the inlet water temperature curve of the inverter on the test bench.

[0113] Specifically, the total number of cycles for the bench test is n;

[0114] n

[0115] In addition, in order to reduce the total cycle times n , so as to accelerate the test effect, the time of high temperature test can be extended, corresponding Figure 3 to the duration of 100℃ ambient temperature.

[0116] It should be noted that the above is the sum of the ambient temperature data, is the sum of the transmission ambient high temperature aging endurance data.

[0117] S05, slice segmentation is carried out for each test driving condition to obtain a slice condition database.

[0118] Please refer to Figure 4 , Figure 4 one of the curves located above is the ambient temperature curve, Figure 4 three curves located below are three slice conditions, it should be noted that the three slice conditions are not limited to the number of slice conditions, and there can be other numbers, which are not particularly limited here.

[0119] S06, according to the inverter inlet water temperature data of the test bench, the inverter temperature rise data set of each slice condition in the slice condition database is replaced.

[0120] Specifically, according to the temperature rise characteristic of the inverter junction temperature, the junction temperature of the inverter is highly related to the inlet water temperature: when the inverter has no working load, the inverter junction temperature is almost equal to the inverter inlet water temperature, so the temperature rise of the whole vehicle after the inverter loading current under the test driving condition can be calculated by the following formula , that is the inverter temperature rise data.

[0121]

[0122] In the formula, is the measured inverter junction temperature of the target vehicle, is the measured inverter inlet water temperature of the target vehicle.

[0123] According to the inverter inlet water temperature data of the test bench , the inverter junction temperature of the test bench condition is calculated .

[0124]

[0125] The calculated inverter junction temperature is used for the junction temperature time statistics and rain flow calculation statistics of the inverter in the test bench, that is, the inverter temperature rise data set.

[0126] S07, based on the replaced slice working condition database, iterative calculation is performed to determine a suitable slice working condition, and the suitable slice working condition is input into the test bench to test the target new energy transmission.

[0127] Specifically, in the step of iterative calculation based on the plurality of test data and the corresponding plurality of conversion data in the plurality of slice working conditions, and determining a suitable slice working condition according to the calculation result, comprising:

[0128] The sum of each inverter junction temperature high temperature aging endurance data in the plurality of slice working conditions is combined with the sum of each junction temperature data to perform percentage calculation to obtain a junction temperature calculation result, wherein the inverter junction temperature high temperature aging endurance data is the inverter junction temperature high temperature aging endurance data of the test bench, and the junction temperature data is the inverter junction temperature high temperature aging endurance data of the whole vehicle in the test driving condition;

[0129] The sum of each inverter junction temperature temperature change endurance equivalent damage data in the plurality of slice working conditions is combined with the sum of each junction temperature rain flow data to perform percentage calculation to obtain a junction temperature rain flow calculation result, wherein the inverter junction temperature temperature change endurance equivalent damage data is the inverter junction temperature temperature change endurance equivalent damage data of the test bench, and the junction temperature rain flow data is the inverter junction temperature temperature change endurance equivalent damage data of the whole vehicle in the test driving condition;

[0130] The junction temperature calculation result and the junction temperature rain flow calculation result are compared with the pre-design calculation result respectively;

[0131] When the junction temperature calculation result and the junction temperature rain flow calculation result do not satisfy the pre-design calculation result, the slice working condition in the slice working condition database is selected N times, and iterative calculation is performed based on the plurality of slice working conditions selected each time, so that the Nth junction temperature calculation result and the Nth junction temperature rain flow calculation result corresponding to the Nth selection both satisfy the pre-design calculation result, and the slice working condition corresponding to the pre-design calculation result that satisfies the pre-design calculation result is input into the test bench to test the target new energy transmission.

[0132] In some preferred embodiments, after the step of comparing the junction temperature calculation result and the junction temperature rain flow calculation result with the pre-design calculation result, further comprising:

[0133] When the Nth junction temperature calculation result and the Nth junction temperature rain flow calculation result corresponding to the Nth selection do not satisfy the pre-design calculation result;

[0134] The inverter temperature rise data actually measured by the whole vehicle is adjusted by increasing / deleting, so that the inverter inlet water temperature data of the test bench is adjusted;

[0135] The inverter temperature rise data set of each slice working condition in the slice working condition database is replaced based on the adjusted inverter inlet water temperature data of the test bench.

[0136] The N+1th selection is performed again based on the replaced slice working condition in the slice working condition database, so that the N+1th selection corresponds to the N+1th junction temperature calculation result and the N+1th junction temperature rain flow calculation result both satisfying the pre-design calculation result, and the slice working condition corresponding to the pre-design calculation result is input into the test bench to test the target new energy transmission.

[0137] For the convenience of understanding the case, the specific adjustment strategy is used for illustration, please refer to Figure 5 shown in the strategy is the sum of the high-temperature aging endurance data of the plurality of inverters of the test bench, is the sum of the high-temperature aging endurance data of the plurality of inverters of the whole vehicle, is the sum of the temperature change endurance equivalent damage data of the plurality of inverters of the test bench, is the sum of the temperature change endurance equivalent damage data of the plurality of inverters of the whole vehicle.

[0138] The specific cycle iteration calculation method adopts the following adjustment strategy:

[0139] The first adjustment strategy: when , , the working conditions with small and occupancy ratios can be deleted.

[0140] The second adjustment strategy: when , , the slice working conditions with small and occupancy ratios can be selected from the slice working condition database and added to the test bench.

[0141] The third adjustment strategy: when , (deviation <2%), the occupancy time of the high-temperature region of the cooling water is increased. The can be increased, while the changes little.

[0142] The fourth adjustment strategy:

[0143] when , , the occupancy time of the high-temperature region of the cooling water is reduced. The can be reduced, while the changes little.

[0144] The fifth adjustment strategy: when (deviation <2%), , the slice working conditions with small single peak is higher, while the average single peak is higher, while the average single peak is higher, while the average single peak is higher, while the average single peak is higher, while the average

[0145] 6th adjustment strategy: when deviation < 2%, select from the slice condition database single peak is smaller, while the average single peak is smaller, while the average single peak is smaller, while the average single peak is smaller, while the average

[0146] Specifically, taking the durability test bench condition design of a certain project transmission in the ambient temperature environment as an example, first, select several conditions from the slice condition database to combine into the test bench durability condition, and calculate and , it should be noted that the test bench durability condition is the appropriate slice condition input into the test bench.

[0147] Suppose , , the 1st adjustment strategy is adopted, and the conditions with small proportions of and are deleted;

[0148] After deletion, recalculate and ;

[0149] If , , the 2nd adjustment strategy is adopted, and the conditions with small proportions of and are selected from the slice condition database and added to the test bench durability condition.

[0150] Recalculate and , there can be the following two cases:

[0151] (1) If , , the 4th adjustment strategy is adopted, the high temperature area time of the inverter inlet water temperature in Figure 3 is reduced while the temperature amplitude remains unchanged, that is, reduce while keeping unchanged. After adjustment, the verification target of , can be achieved.

[0152] (2) If , Then, the fifth adjustment strategy is adopted, selecting from the slice working condition database. The average value of a single peak value in the test bench durability test is higher than that in the test bench durability test. The operating conditions are quite challenging. Operating conditions with higher single peak values ​​can increase the amplitude of the temperature fatigue cycle, thereby increasing... After adjustment, it can be achieved. , The verification target.

[0153] In summary, the environmental temperature durability testing method for new energy transmissions shown in this embodiment has at least the following advantages compared with existing technologies for testing new energy transmissions:

[0154] In the environmental temperature durability testing method for a new energy transmission provided by this invention, the new energy transmission is first mounted on a vehicle for multiple test drives. Multiple test data points for each test drive condition are acquired to form a test data table, which includes a transmission environmental temperature dataset and an inverter temperature rise dataset. Then, the data in the transmission environmental temperature dataset and the inverter temperature rise dataset are analyzed and calculated separately to obtain multiple conversion data points for the bench test conditions. Based on the transmission environmental temperature dataset, transmission environmental temperature curves and inverter inlet water temperature curves for the bench test conditions are designed, and the total number of cycles for the bench test conditions is calculated. Each test drive condition is then segmented to obtain a segmented condition database. The inverter inlet water temperature data of the test bench is used to replace the inverter temperature rise dataset for each slice of the test condition database. Iterative calculations are then performed based on the replaced slice of the test condition database to determine the appropriate slice of the test condition. The appropriate slice of the test condition is then input into the test bench to test the target new energy transmission. Through the test method of this application, the final slice of the test condition is the transmission ambient temperature durability test condition. This allows the test of the target new energy transmission to simultaneously meet the high-temperature aging durability verification and temperature change durability verification of electronic components. Furthermore, the designed test condition greatly replicates the working environment of the new energy transmission under the actual working conditions of the vehicle, avoiding over-verification or under-verification of the transmission electronic components.

[0155] Second Embodiment

[0156] Another aspect of this invention provides an environmental temperature durability testing system for new energy transmissions; please refer to [link / reference]. Figure 6 The image shows an environmental temperature durability testing system for a new energy transmission according to a second embodiment of the present invention. The environmental temperature durability testing system for a new energy transmission includes:

[0157] Test drive module 11 is used to mount the new energy transmission on the vehicle for multiple test drives;

[0158] The acquisition module 12 is configured to acquire a plurality of test data of each test driving condition to form a test data table, wherein the test data table comprises a transmission ambient temperature data set and an inverter temperature rise data set;

[0159] The analysis and calculation module 13 is configured to analyze and calculate the data in the transmission ambient temperature data set and the data in the inverter temperature rise data set, respectively, to obtain a plurality of conversion data of the test bench test condition.

[0160] The cycle number calculation module 14 is configured to design a transmission ambient temperature curve and an inverter inlet water temperature curve of the test bench test condition based on the transmission ambient temperature data set, and calculate the total cycle number of the test bench test condition.

[0161] The slicing module 15 is configured to slice and segment each test driving condition to obtain a sliced condition database.

[0162] The replacement module 16 is configured to replace the inverter temperature rise data set corresponding to each sliced condition in the sliced condition database according to the inverter inlet water temperature data of the test bench.

[0163] The iteration calculation module 17 is configured to perform iteration calculation based on the replaced sliced condition database to determine a suitable sliced condition, and input the suitable sliced condition into the test bench to test the target new energy transmission.

[0164] Third embodiment

[0165] Another aspect of the present application also provides a new energy transmission environmental temperature endurance test device, please refer to Figure 7 , the new energy transmission environmental temperature endurance test device in the third embodiment of the present application is shown, including memory 20, processor 10 and computer program 30 stored in the memory and running on the processor, the processor 10 realizes the computer program 30 when the environmental temperature endurance test method of new energy transmission as above.

[0166] Among them, the new energy transmission environmental temperature endurance test device can be a computer, a new energy transmission environmental temperature endurance test device, etc., and the processor 10 can be a central processing unit (CPU), a controller, a microcontroller, a microprocessor or other data processing chip in some embodiments, used to run the program code stored in the memory 20 or process data, such as executing access restriction program.

[0167] The memory 20 includes at least one type of readable storage medium, such as a flash memory, a hard disk, a multimedia card, a card-type memory (e.g., an SD or DX memory, etc.), a magnetic memory, a disk, an optical disk, etc. The memory 20 can be an internal storage unit of the environment temperature durability test device for the new energy transmission in some embodiments, such as a hard disk of the environment temperature durability test device for the new energy transmission. The memory 20 can also be an external storage device of the environment temperature durability test device for the new energy transmission in other embodiments, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the environment temperature durability test device for the new energy transmission. Further, the memory 20 can include both the internal storage unit and the external storage device of the environment temperature durability test device for the new energy transmission. The memory 20 can be used not only to store application software and various data installed on the environment temperature durability test device for the new energy transmission, but also to temporarily store data that has been output or will be output.

[0168] It should be noted that, Figure 7 The illustrated structure does not constitute a limitation on the environment temperature durability test device for the new energy transmission, and in other embodiments, the environment temperature durability test device for the new energy transmission can include fewer or more components than those illustrated, or combine certain components, or different component arrangements.

[0169] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0170] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A method for environmental temperature durability testing of a new energy transmission, characterized in that, The test method is applied to a test bench for testing a new energy transmission, and the test method comprises: a new energy transmission is mounted on a whole vehicle to perform multiple test drives; a plurality of test data of each test drive condition is obtained to form a test data table, wherein the test data table comprises a transmission ambient temperature data set and an inverter temperature rise data set; data in the transmission ambient temperature data set and data in the inverter temperature rise data set are analyzed and calculated respectively to obtain a plurality of conversion data of the test bench test condition; the inverter temperature rise data set comprises an inverter junction temperature data subset and an inverter junction temperature rain flow data subset; each ambient temperature data in the transmission ambient temperature data set, each junction temperature data in the inverter junction temperature data subset, and each junction temperature rain flow data in the inverter junction temperature rain flow data subset are analyzed and converted respectively to obtain transmission ambient high temperature aging endurance data, inverter junction temperature high temperature aging endurance data, and inverter junction temperature temperature change equivalent damage data of the test bench test condition; wherein the transmission ambient high temperature aging endurance data, the inverter junction temperature high temperature aging endurance data, and the inverter junction temperature temperature change equivalent damage data are all conversion data; a transmission ambient temperature curve and an inverter inlet water temperature curve of the test bench test condition are designed based on the transmission ambient temperature data set, and the total cycle number of the test bench test condition is calculated; each test drive condition is sliced and divided to obtain a slice condition database; the inverter temperature rise data set of each slice condition in the slice condition database is replaced according to the inverter inlet water temperature data of the test bench; based on the replaced slice condition database, iterative calculation is performed to determine a suitable slice condition, and the suitable slice condition is input into the test bench to test the target new energy transmission; the sum of each inverter junction temperature high temperature aging endurance data in the plurality of slice conditions and the sum of each junction temperature data are combined for percentage calculation to obtain a junction temperature calculation result; the sum of each inverter junction temperature temperature change endurance equivalent damage data in the plurality of slice conditions and the sum of each junction temperature rain flow data are combined for percentage calculation to obtain a junction temperature rain flow calculation result; the junction temperature calculation result and the junction temperature rain flow calculation result are compared with the pre-designed calculation result respectively; when the junction temperature calculation result and the junction temperature rain flow calculation result both do not meet the pre-designed calculation result, the slice conditions in the slice condition database are selected N times, and iterative calculation is performed based on the plurality of slice conditions selected each time, so that the Nth junction temperature calculation result and the Nth junction temperature rain flow calculation result corresponding to the Nth selection both meet the pre-designed calculation result, and the slice condition meeting the pre-designed calculation result is input into the test bench to test the target new energy transmission.

2. The method of claim 1, wherein each ambient temperature data in the transmission ambient temperature data set is analyzed and converted according to the following formula: wherein, is the acceleration factor, is the failure activation energy, is the Boltzmann constant, is the test temperature, is the transmission ambient temperature collected in the vehicle test, is the time corresponding to the transmission ambient temperature, is the transmission ambient high-temperature aging endurance data.

3. The method of claim 1, wherein, each junction temperature data in the inverter junction temperature data subset is analyzed and converted according to the following formula: In the formula, is an acceleration factor, is an activation energy for failure, is the Boltzmann constant, is the test temperature, is the inverter junction temperature collected by the vehicle test, is the time corresponding to the inverter junction temperature, is the inverter junction temperature high-temperature aging endurance data.

4. The method of claim 1, wherein Each junction temperature rainflow data in the junction temperature rainflow data subset is analyzed and converted according to the following formula: In the formula, is the stress is the number of cycles is the stress is the nominal stress is the negative reciprocal of the slope of the SN curve is the stress is the number of cycles is the actual temperature difference of the electronic component is the inverter junction temperature variation endurance equivalent damage data 5. The method of claim 1, wherein, After the step of comparing the junction temperature calculation result and the junction temperature rainflow calculation result with the pre-design calculation result respectively, the method further comprises: When the Nth selected Nth junction temperature calculation result and Nth junction temperature rainflow calculation result do not satisfy the pre-design calculation result; The whole vehicle measured inverter temperature rising data is adjusted by adding or deleting, so that the inverter inlet water temperature data of the test bench is adjusted; The inverter temperature rising data set of each slice working condition in the slice working condition database is replaced based on the adjusted inverter inlet water temperature data of the test bench; The N+1th selection is performed again based on the replaced slice working condition in the slice working condition database, so that the N+1th selected N+1th junction temperature calculation result and N+1th junction temperature rainflow calculation result both satisfy the pre-design calculation result, and the slice working condition corresponding to the pre-design calculation result is input into the test bench to test the target new energy transmission.

6. The method of claim 1, wherein, In the step of obtaining a plurality of test data of each test driving working condition to form a test data table, the method further comprises: The plurality of test data are linearly extrapolated to obtain a full life cycle durability target.

7. An ambient temperature durability test system for a new energy transmission, characterized in that, The system tests the new energy transmission by the new energy transmission environmental temperature durability test method of any one of claims 1-6, and the system comprises: A test driving module for mounting the new energy transmission on a whole vehicle for multiple test driving; An acquisition module for acquiring a plurality of test data of each test driving working condition to form a test data table, wherein the test data table comprises a transmission environmental temperature data set and an inverter temperature rising data set; An analysis and calculation module for analyzing and calculating data in the transmission environmental temperature data set and data in the inverter temperature rising data set respectively to obtain a plurality of conversion data of test bench test working conditions; A cycle number calculation module for designing a transmission environmental temperature curve and an inverter inlet water temperature curve of test bench test working conditions based on the transmission environmental temperature data set, and calculating a total cycle number of test bench test working conditions; A slicing module for slicing and dividing each test driving working condition to obtain a slice working condition database; A replacement module for replacing an inverter temperature rising data set corresponding to each slice working condition in the slice working condition database according to the inverter inlet water temperature data of the test bench; An iterative calculation module for performing iterative calculation based on the replaced slice working condition database to determine a suitable slice working condition, and inputting the suitable slice working condition into the test bench to test the target new energy transmission.

8. An environmental temperature endurance test apparatus for a new energy transmission, characterized by, A computer program product comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the new energy transmission environmental temperature durability test method of any one of claims 1-6 when executing the program. A computer program product comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the new energy transmission environmental temperature durability test method of any one of claims 1-6 when executing the program.

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