A gearbox temperature testing method

Abstract

The invention discloses a gearbox temperature testing method, and relates to the technical field of vehicle detection. The invention provides various suitable temperature test groups and various high temperature test groups, performs suitable temperature tests on various suitable temperature test groups and high temperature tests on various high temperature test groups in a test scene, thereby collecting suitable temperature test information corresponding to various suitable temperature test groups and high temperature test information corresponding to various high temperature test groups, and analyzes the gearbox shift response speed corresponding to various suitable temperature test groups at various time points, the noise decibel generated under the gearbox operating state, and according to the gearbox oil concentration, the hydraulic pressure in the gearbox, the apparent image of the gearbox to be tested, the carbon monoxide concentration and the nitrogen concentration in the test field, the operation compliance index of the gearbox to be tested under various suitable temperature test groups and the operation safety index of the gearbox to be tested under various high temperature test groups, thereby better and more accurately detecting the gearbox temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle detection, and in particular to a gearbox temperature testing method. Background Art

[0002] At present, the temperature test of the gearbox is mainly carried out by placing a temperature sensor inside the gearbox to directly detect the gearbox temperature. This temperature test method has the following problems: 1. The temperature sensor is usually installed in a fixed position on the gearbox housing, which cannot accurately represent the temperature distribution inside the entire gearbox. Especially when the temperature gradient inside the gearbox is large, the measurement result of a single position may not fully reflect the actual situation. Since there is a certain heat transfer delay between the sensor and the internal temperature of the gearbox, the measurement result may not reflect the temperature change inside the gearbox immediately. Especially when the temperature changes frequently, the delay may affect the accuracy of the test results.

[0003] 2. There may be a temperature gradient of the liquid in the gearbox, that is, the temperature difference at different positions, which may cause the measurement result at a single position to be unable to fully reflect the true average temperature of the liquid inside the gearbox. The temperature change of the gearbox is not analyzed from multiple aspects. The temperature of the gearbox is detected from a single aspect, which may affect the accuracy of the test results due to other influencing factors. Summary of the invention

[0004] The purpose of the present invention is to provide a gearbox temperature testing method, which solves the problems existing in the background technology.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: The present invention provides a gearbox temperature testing method, which comprises the following steps: Step 1, gearbox acquisition: acquiring standard information corresponding to each gearbox to be tested, wherein the standard information comprises a standard suitable working temperature, a standard maximum temperature, and a reference gearbox temperature corresponding to each driving speed;

[0006] Step 2: Gearbox temperature test: Based on the standard suitable working temperature of the gearbox to be tested, set each temperature test group, and then perform temperature tests on each temperature test group in the test scenario, so as to collect temperature test information corresponding to each temperature test group;

[0007] Step 3: Gearbox suitable temperature analysis: According to the suitable temperature test information corresponding to each suitable temperature test group, analyze the operation compliance index of the gearbox corresponding to each suitable temperature test group, and screen out the actual suitable temperature corresponding to the gearbox to be tested, and at the same time determine whether the standard suitable operating temperature of the gearbox of the vehicle to be tested is accurate;

[0008] Step 4: High-temperature test of the gearbox: Based on the standard maximum temperature corresponding to the gearbox to be tested, each high-temperature test group is set, and then each high-temperature test group is tested at high temperature in the test scenario, so as to collect high-temperature test information corresponding to each high-temperature test group;

[0009] Step 5: Gearbox high temperature analysis: Based on the corresponding high temperature test information in each high temperature test group, analyze the operation safety index of the gearbox to be tested under each high temperature test group, and screen out the actual maximum temperature corresponding to the gearbox to be tested, and determine whether the standard maximum temperature of the gearbox to be tested is accurate;

[0010] Step 6. Test result display: Displays whether the standard suitable working temperature and standard maximum temperature of the gearbox to be tested are accurate, and displays the corresponding suitable operating temperature and upper limit operating temperature of the gearbox to be tested.

[0011] Preferably, a temperature adaptation test is performed in step 2, and the specific test process is as follows: S1, setting the test temperature corresponding to each temperature adaptation test group according to the set temperature difference and the standard suitable working temperature corresponding to the gearbox to be tested, and then placing each gearbox to be tested in each temperature adaptation test group test vehicle in the test field in turn;

[0012] S2. According to the test temperature corresponding to each temperature test group and the reference gearbox temperature corresponding to each driving speed, the driving speed of the test vehicle corresponding to each temperature test group is obtained, and then the test vehicle corresponding to each temperature test group is controlled to travel at its driving speed, and after driving for a preset time, the driving speed of the test vehicle corresponding to each temperature test group is increased according to the preset driving speed increase value, and after the acceleration is completed, the driving time is preset to complete the temperature test of each temperature test group, and then the temperature test information corresponding to each temperature test group of the gearbox corresponding to the tested vehicle is collected. The temperature test information corresponding to each temperature test group of the gearbox corresponding to the tested vehicle includes the gearbox shift response speed corresponding to each temperature test group at each time point and the noise decibel generated in the gearbox operating state.

[0013] Preferably, the analysis of the operation compliance index of the gearbox to be tested under each suitable temperature test group is specifically performed as follows: the gearbox shift response speed of the gearbox to be tested in each suitable temperature test group corresponding to each suitable temperature test group of the test field at each time point and the decibel of noise generated under the gearbox running state are substituted into the calculation formula Get the operation compliance index ξ of the gearbox to be tested under each temperature test group i , where A t i , B t iThey respectively represent the gearbox shift response speed corresponding to the i-th temperature test group at the t-th time point and the noise decibel generated in the gearbox operation state, i represents the number corresponding to each temperature test group, i=1, 2..., n, n is any integer greater than 2, t represents the number corresponding to each time point, t=2,..., m, m is any integer greater than 2, A i t-1 , B i t-1 They respectively represent the gearbox shift response speed and the noise decibel generated under the gearbox operating state of the i-th suitable temperature test group at the t-1th time point, ΔA and ΔB are the set allowable gearbox shift response speed difference and the allowable gearbox operating state noise decibel difference, μ1 and μ2 are the weight factors corresponding to the set gearbox shift response speed and the noise decibel generated under the gearbox operating state, respectively.

[0014] Preferably, the actual suitable temperature corresponding to the gearbox to be tested is screened out, and at the same time, whether the standard suitable operating temperature of the gearbox of the vehicle to be tested is judged to be accurate, and the specific process is as follows: the operation compliance index of the gearbox to be tested under each temperature test group is compared with a preset operation compliance index threshold value, if the operation compliance index of the gearbox to be tested under a certain temperature test group is greater than or equal to the preset operation compliance index threshold value, then the temperature in the temperature test group is judged to be a suitable temperature;

[0015] The operation compliance indexes of the gearboxes to be tested in each suitable temperature test group are sorted in descending order, and the temperature in the suitable temperature test group corresponding to the first-ranked operation compliance index is used as the actual temperature corresponding to the gearbox to be tested;

[0016] The actual temperature corresponding to the gearbox to be tested is compared with the standard suitable working temperature. If the actual temperature corresponding to the gearbox to be tested is the same as the standard suitable working temperature, it is determined that the standard suitable working temperature of the gearbox to be tested is accurate; otherwise, it is determined that the standard suitable working temperature of the gearbox to be tested is inaccurate.

[0017] Preferably, a high temperature test is performed in step 4, and the specific test process is as follows: A1, the test temperature corresponding to each high temperature test group is set according to the standard maximum temperature corresponding to the gearbox to be tested and the set temperature difference, and then each gearbox to be tested is sequentially placed in each high temperature test group test vehicle of the test field;

[0018] A2. According to the test temperature corresponding to each high-temperature test group and the reference gearbox temperature corresponding to each driving speed, the driving speed of the test vehicle corresponding to each high-temperature test group is obtained, and then the test vehicle corresponding to each high-temperature test group is controlled to travel at its driving speed, and after driving for a preset time, the driving speed of the test vehicle corresponding to each high-temperature test group is increased according to the preset driving speed increase value. After the driving speed of the test vehicle reaches the set maximum speed, it drives for a preset time to complete the high-temperature test of each high-temperature test group, and then the high-temperature test information corresponding to each high-temperature test group of the gearbox corresponding to the vehicle to be tested is collected. The high-temperature test information corresponding to each high-temperature test group of the gearbox corresponding to the vehicle to be tested includes gearbox oil concentration, hydraulic pressure in the gearbox, apparent image of the gearbox to be tested, carbon monoxide concentration and nitrogen concentration at the gearbox.

[0019] Preferably, the analysis of the operation compliance index of the gearbox to be tested under each high temperature test group is specifically performed as follows: according to the gearbox oil concentration and the gearbox internal hydraulic pressure corresponding to each high temperature test group in the test field, the first operation compliance index corresponding to the gearbox to be tested under each high temperature test group is obtained by analysis, which is recorded as Wherein j represents the number corresponding to each high temperature test group, j=1, 2...x, x is any integer greater than 2;

[0020] According to the apparent image of the gearbox to be tested corresponding to each high temperature test group in the test field, the carbon monoxide concentration and the nitrogen concentration in the test field, the operation safety compliance index corresponding to the gearbox to be tested under each high temperature test group is analyzed and obtained, which is recorded as

[0021] By calculating the formula Get the operating safety index of the gearbox to be tested under each high temperature test group Among them, ε1 and ε2 are the weight factors corresponding to the set first operation compliance index and operation safety compliance index respectively.

[0022] Preferably, the specific calculation formula of the first operation compliance index corresponding to the gearbox to be tested in each high temperature test group is: Among them C t j , P t j are the gearbox oil concentration and gearbox hydraulic pressure corresponding to the jth high temperature test group at the tth time point, C j t-1 , P j t-1They respectively represent the gearbox oil concentration and the gearbox hydraulic pressure corresponding to the j-th high temperature test group at the t-1th time point, ΔC and ΔP are the set allowable gearbox oil concentration difference and the allowable gearbox hydraulic pressure difference, η1 and η2 are the weight factors corresponding to the set gearbox oil concentration and the gearbox hydraulic pressure, respectively.

[0023] Preferably, the analysis obtains the operation safety compliance index corresponding to the gearbox to be tested under each high temperature test group. The specific analysis process is as follows: based on the apparent image of the gearbox to be tested corresponding to each high temperature test group in the test field, the surface flatness compliance coefficient corresponding to the gearbox to be tested corresponding to each high temperature test group is calculated and recorded as

[0024] By calculating the formula Obtain the operation safety compliance index corresponding to the gearbox to be tested under each high temperature test group Among them j 、N j They respectively represent the carbon monoxide concentration and hydrogen concentration in the test field corresponding to the i-th high-temperature test group, co and N respectively represent the initial carbon monoxide concentration and initial nitrogen concentration in the test field, γ1, γ2, and γ3 are the weight factors corresponding to the set surface flatness compliance coefficient, carbon monoxide concentration, and nitrogen concentration, respectively.

[0025] Preferably, the specific calculation formula of the surface flatness compliance coefficient of the gearbox to be tested corresponding to each high temperature test group is: Substitute the average roughness parameter of the gearbox surface and the height difference between the highest peak and the lowest valley of the gearbox surface into the calculation formula Obtain the surface flatness compliance coefficient of the gearbox to be tested corresponding to each high temperature test group Where E j 、F j are the average roughness parameter of the gearbox surface corresponding to the i-th high temperature test group, the height difference between the highest peak and the lowest valley on the gearbox surface, and E j ′、F j ′ is the standard average roughness parameter of the gearbox surface and the standard height difference between the highest peak and the lowest valley of the gearbox surface, ΔE and ΔF are the allowable average roughness parameter difference of the gearbox surface and the allowable height difference between the highest peak and the lowest valley of the gearbox surface, δ1 and δ2 are the weight factors corresponding to the average roughness parameter of the gearbox surface and the height difference between the highest peak and the lowest valley of the gearbox surface, respectively.

[0026] Preferably, the actual upper limit temperature corresponding to the gearbox to be tested is screened out, and at the same time, it is judged whether the upper limit value of the standard maximum temperature of the gearbox to be tested is accurate. The specific process is as follows: the operation safety index of the gearbox to be tested under each high temperature test group is compared with the preset operation safety index threshold value. If the operation safety index of the gearbox to be tested under a certain high temperature test group is greater than or equal to the preset operation safety index threshold value, it is judged that the temperature in the high temperature test group is a safe temperature, and the high temperature test group is recorded as a safe high temperature test group, so as to screen out each safe high temperature test group;

[0027] The operating safety indexes of the gearboxes to be tested in each safety high temperature test group are sorted in descending order, and the temperature in the safety high temperature test group corresponding to the first-ranked operating safety index is used as the actual temperature corresponding to the gearbox to be tested;

[0028] The actual temperature corresponding to the gearbox to be tested is compared with the upper limit value of the standard maximum temperature. If the actual temperature corresponding to the gearbox to be tested is the same as the upper limit value of the standard maximum temperature, it is determined that the upper limit value of the standard maximum temperature of the gearbox to be tested is accurate; otherwise, it is determined that the upper limit value of the standard maximum temperature of the gearbox to be tested is inaccurate.

[0029] The beneficial effects of the present invention are as follows: 1. A gearbox temperature testing method provided by the present invention, by setting various suitable temperature test groups and various high temperature test groups, performs suitable temperature tests on each suitable temperature test group and performs high temperature tests on each high temperature test group in a test scenario, thereby collecting suitable temperature test information corresponding to each suitable temperature test group and high temperature test information corresponding to each high temperature test group, by analyzing the gearbox shifting response speed corresponding to each suitable temperature test group at each time point and the noise decibel generated under the gearbox operating state, and according to the gearbox oil concentration, the hydraulic pressure in the gearbox, the apparent image of the gearbox to be tested, the carbon monoxide concentration and the nitrogen concentration in the test field, a multi-faceted analysis is performed to obtain the operating compliance index of the gearbox to be tested under each suitable temperature test group and the operating safety index of the gearbox to be tested under each high temperature test group, thereby better and more accurately detecting the gearbox temperature.

[0030] 2. The operation safety compliance index corresponding to the gearbox to be tested under each high temperature test group and the surface flatness compliance coefficient corresponding to the gearbox to be tested under each high temperature test group are calculated and analyzed, so as to obtain the operation safety index of the gearbox to be tested under each high temperature test group. By analyzing the suitable temperature and the maximum temperature to be tolerated of the gearbox, and analyzing and comparing the obtained temperature data, more in-depth fault diagnosis and preventive measures can be provided, thereby helping to extend the service life of the gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 The present invention is a schematic flow chart of the steps for implementing the method. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1 As shown, the present invention provides a gearbox temperature testing method, the method comprising the following steps: Step 1, gearbox acquisition: acquiring standard information corresponding to each gearbox to be tested, wherein the standard information includes a standard suitable working temperature, a standard maximum temperature, and a reference gearbox temperature corresponding to each driving speed;

[0035] Step 2: Gearbox temperature test: Based on the standard suitable working temperature of the gearbox to be tested, set each temperature test group, and then perform temperature tests on each temperature test group in the test scenario, so as to collect temperature test information corresponding to each temperature test group;

[0036] It should be noted that the temperature test information corresponding to each temperature test group is obtained by detecting the shifting speed during vehicle driving and detecting the decibel of noise generated by the gearbox during vehicle driving through a decibel detector.

[0037] In a specific embodiment, the step 2 performs a temperature test, and the specific test process is as follows: S1, setting the test temperature corresponding to each temperature test group according to the set temperature difference and the standard suitable working temperature of the gearbox to be tested, and then placing each gearbox to be tested in each temperature test group test vehicle of the test field in turn;

[0038] S2. According to the test temperature corresponding to each temperature test group and the reference gearbox temperature corresponding to each driving speed, the driving speed of the test vehicle corresponding to each temperature test group is obtained, and then the test vehicle corresponding to each temperature test group is controlled to travel at its driving speed, and after driving for a preset time, the driving speed of the test vehicle corresponding to each temperature test group is increased according to the preset driving speed increase value, and after the acceleration is completed, the driving time is preset to complete the temperature test of each temperature test group, and then the temperature test information corresponding to each temperature test group of the gearbox corresponding to the tested vehicle is collected. The temperature test information corresponding to each temperature test group of the gearbox corresponding to the tested vehicle includes the gearbox shift response speed corresponding to each temperature test group at each time point and the noise decibel generated in the gearbox operating state.

[0039] Step 3: Gearbox suitable temperature analysis: According to the suitable temperature test information corresponding to each suitable temperature test group, analyze the operation compliance index of the gearbox corresponding to each suitable temperature test group, and screen out the actual suitable temperature corresponding to the gearbox to be tested, and at the same time determine whether the standard suitable operating temperature of the gearbox of the vehicle to be tested is accurate;

[0040] In a specific embodiment, the operation compliance index of the gearbox to be tested under each suitable temperature test group is analyzed. The specific analysis process is as follows: the gearbox shift response speed of the gearbox to be tested in each suitable temperature test group corresponding to each suitable temperature test group of the test field at each time point and the noise decibel generated under the gearbox running state are substituted into the calculation formula Get the operation compliance index ξ of the gearbox to be tested under each temperature test group i , where A t i , B t i They respectively represent the gearbox shift response speed corresponding to the i-th temperature test group at the t-th time point and the noise decibel generated in the gearbox operation state, i represents the number corresponding to each temperature test group, i=1, 2..., n, n is any integer greater than 2, t represents the number corresponding to each time point, t=2,..., m, m is any integer greater than 2, A i t-1 , B i t-1 They respectively represent the gearbox shift response speed and the noise decibel generated under the gearbox operating state of the i-th suitable temperature test group at the t-1th time point, ΔA and ΔB are the set allowable gearbox shift response speed difference and the allowable gearbox operating state noise decibel difference, μ1 and μ2 are the weight factors corresponding to the set gearbox shift response speed and the noise decibel generated under the gearbox operating state, respectively.

[0041] In a specific embodiment, the actual suitable temperature corresponding to the gearbox to be tested is screened out, and at the same time, whether the standard suitable operating temperature of the gearbox of the vehicle to be tested is determined to be accurate, the specific process is as follows: the operation compliance index of the gearbox to be tested under each temperature test group is compared with the preset operation compliance index threshold value, if the operation compliance index of the gearbox to be tested under a certain temperature test group is greater than or equal to the preset operation compliance index threshold value, then the temperature in the temperature test group is determined to be a suitable temperature;

[0042] The operation compliance indexes of the gearboxes to be tested in each suitable temperature test group are sorted in descending order, and the temperature in the suitable temperature test group corresponding to the first-ranked operation compliance index is used as the actual temperature corresponding to the gearbox to be tested;

[0043] The actual temperature corresponding to the gearbox to be tested is compared with the standard suitable working temperature. If the actual temperature corresponding to the gearbox to be tested is the same as the standard suitable working temperature, it is determined that the standard suitable working temperature of the gearbox to be tested is accurate; otherwise, it is determined that the standard suitable working temperature of the gearbox to be tested is inaccurate.

[0044] Step 4: High-temperature test of the gearbox: Based on the standard maximum temperature corresponding to the gearbox to be tested, each high-temperature test group is set, and then each high-temperature test group is tested at high temperature in the test scenario, so as to collect high-temperature test information corresponding to each high-temperature test group;

[0045] It should be noted that the high temperature test information corresponding to each high temperature test group is obtained by detecting the concentration of the gearbox oil by colorimetry, detecting the hydraulic pressure in the gearbox by a hydraulic oil pressure gauge, detecting the surface image of the gearbox to be tested by installing a camera device on the gearbox surface, and installing a carbon monoxide concentration detector device and a nitrogen concentration detection device on the gearbox surface.

[0046] In a specific embodiment, a high temperature test is performed in step 4, and the specific test process is as follows: A1, the test temperature corresponding to each high temperature test group is set according to the standard maximum temperature corresponding to the gearbox to be tested and the set temperature difference, and then each gearbox to be tested is placed in each high temperature test group test vehicle in the test field in turn;

[0047] A2. According to the test temperature corresponding to each high-temperature test group and the reference gearbox temperature corresponding to each driving speed, the driving speed of the test vehicle corresponding to each high-temperature test group is obtained, and then the test vehicle corresponding to each high-temperature test group is controlled to travel at its driving speed, and after driving for a preset time, the driving speed of the test vehicle corresponding to each high-temperature test group is increased according to the preset driving speed increase value. After the driving speed of the test vehicle reaches the set maximum speed, it drives for a preset time to complete the high-temperature test of each high-temperature test group, and then the high-temperature test information corresponding to each high-temperature test group of the gearbox corresponding to the vehicle to be tested is collected. The high-temperature test information corresponding to each high-temperature test group of the gearbox corresponding to the vehicle to be tested includes gearbox oil concentration, hydraulic pressure in the gearbox, apparent image of the gearbox to be tested, carbon monoxide concentration and nitrogen concentration at the gearbox.

[0048] Step 5: Gearbox high temperature analysis: Based on the corresponding high temperature test information in each high temperature test group, analyze the operation safety index of the gearbox to be tested under each high temperature test group, and screen out the actual maximum temperature corresponding to the gearbox to be tested, and determine whether the standard maximum temperature of the gearbox to be tested is accurate;

[0049] In a specific embodiment, the operation compliance index of the gearbox to be tested under each high temperature test group is analyzed, and the specific analysis process is as follows: according to the gearbox oil concentration and the hydraulic pressure in the gearbox corresponding to each high temperature test group in the test field, the first operation compliance index corresponding to the gearbox to be tested under each high temperature test group is obtained by analysis, which is recorded as Wherein j represents the number corresponding to each high temperature test group, j=1, 2...x, x is any integer greater than 2;

[0050] According to the apparent image of the gearbox to be tested corresponding to each high temperature test group in the test field, the carbon monoxide concentration and the nitrogen concentration in the test field, the operation safety compliance index corresponding to the gearbox to be tested under each high temperature test group is analyzed and obtained, which is recorded as

[0051] By calculating the formula Get the operating safety index of the gearbox to be tested under each high temperature test group Among them, ε1 and ε2 are the weight factors corresponding to the set first operation compliance index and operation safety compliance index respectively.

[0052] In a specific embodiment, the specific calculation formula of the first operation compliance index corresponding to the gearbox to be tested in each high temperature test group is: Among them C t j , P t j are the gearbox oil concentration and gearbox hydraulic pressure corresponding to the jth high temperature test group at the tth time point, C jt-1 , P j t-1 They respectively represent the gearbox oil concentration and the gearbox hydraulic pressure corresponding to the j-th high temperature test group at the t-1th time point, ΔC and ΔP are the set allowable gearbox oil concentration difference and the allowable gearbox hydraulic pressure difference, η1 and η2 are the weight factors corresponding to the set gearbox oil concentration and the gearbox hydraulic pressure, respectively.

[0053] In a specific embodiment, the analysis obtains the operation safety compliance index corresponding to the gearbox to be tested under each high temperature test group. The specific analysis process is as follows: based on the apparent image of the gearbox to be tested corresponding to each high temperature test group in the test field, the surface flatness compliance coefficient corresponding to the gearbox to be tested corresponding to each high temperature test group is calculated and recorded as

[0054] By calculating the formula Obtain the operation safety compliance index corresponding to the gearbox to be tested under each high temperature test group Among them j 、N j They respectively represent the carbon monoxide concentration and hydrogen concentration in the test field corresponding to the i-th high-temperature test group, co and N respectively represent the initial carbon monoxide concentration and initial nitrogen concentration in the test field, γ1, γ2, and γ3 are the weight factors corresponding to the set surface flatness compliance coefficient, carbon monoxide concentration, and nitrogen concentration, respectively.

[0055] In a specific embodiment, the specific calculation formula of the surface flatness compliance coefficient of the gearbox to be tested corresponding to each high temperature test group is: Substitute the average roughness parameter of the gearbox surface and the height difference between the highest peak and the lowest valley of the gearbox surface into the calculation formula Obtain the surface flatness compliance coefficient of the gearbox to be tested corresponding to each high temperature test group Where E j 、F j are the average roughness parameter of the gearbox surface corresponding to the i-th high temperature test group, the height difference between the highest peak and the lowest valley on the gearbox surface, and E j ′、F j ′ is the standard average roughness parameter of the gearbox surface and the standard height difference between the highest peak and the lowest valley of the gearbox surface, ΔE and ΔF are the allowable average roughness parameter difference of the gearbox surface and the allowable height difference between the highest peak and the lowest valley of the gearbox surface, δ1 and δ2 are the weight factors corresponding to the average roughness parameter of the gearbox surface and the height difference between the highest peak and the lowest valley of the gearbox surface, respectively.

[0056] In a specific embodiment, the actual upper limit temperature corresponding to the gearbox to be tested is screened out, and at the same time, it is determined whether the upper limit value of the standard maximum temperature of the gearbox to be tested is accurate. The specific process is as follows: the operation safety index of the gearbox to be tested under each high temperature test group is compared with a preset operation safety index threshold value. If the operation safety index of the gearbox to be tested under a certain high temperature test group is greater than or equal to the preset operation safety index threshold value, it is determined that the temperature in the high temperature test group is a safe temperature, and the high temperature test group is recorded as a safe high temperature test group, so as to screen out each safe high temperature test group;

[0057] The operating safety indexes of the gearboxes to be tested in each safety high temperature test group are sorted in descending order, and the temperature in the safety high temperature test group corresponding to the first-ranked operating safety index is used as the actual temperature corresponding to the gearbox to be tested;

[0058] The actual temperature corresponding to the gearbox to be tested is compared with the upper limit value of the standard maximum temperature. If the actual temperature corresponding to the gearbox to be tested is the same as the upper limit value of the standard maximum temperature, it is determined that the upper limit value of the standard maximum temperature of the gearbox to be tested is accurate; otherwise, it is determined that the upper limit value of the standard maximum temperature of the gearbox to be tested is inaccurate.

[0059] Step 6. Test result display: Displays whether the standard suitable working temperature and standard maximum temperature of the gearbox to be tested are accurate, and displays the corresponding suitable operating temperature and upper limit operating temperature of the gearbox to be tested.

[0060] The present invention provides a gearbox temperature testing method. By setting various suitable temperature test groups and various high temperature test groups, suitable temperature tests are performed on various suitable temperature test groups and high temperature tests are performed on various high temperature test groups in a test scenario, thereby collecting suitable temperature test information corresponding to various suitable temperature test groups and high temperature test information corresponding to various high temperature test groups. By analyzing the gearbox shift response speed corresponding to various suitable temperature test groups at various time points and the noise decibels generated under the gearbox operating state, and based on the gearbox oil concentration, the hydraulic pressure in the gearbox, the apparent image of the gearbox to be tested, the carbon monoxide concentration and the nitrogen concentration in the test field, a multi-faceted analysis is performed to obtain the operating compliance index of the gearbox to be tested under various suitable temperature test groups and the operating safety index of the gearbox to be tested under various high temperature test groups, thereby better and more accurately detecting the gearbox temperature.

[0061] The above contents are merely examples and explanations of the concept of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A gearbox temperature testing method, characterized in that: include: Step 1: Gearbox acquisition: obtain standard information corresponding to each gearbox to be tested, wherein the standard information includes standard suitable temperature, standard maximum temperature, and reference gearbox temperature corresponding to each driving speed; Step 2: Gearbox temperature test: Based on the standard suitable working temperature of the gearbox to be tested, set each temperature test group, and then perform temperature tests on each temperature test group in the test scenario, so as to collect temperature test information corresponding to each temperature test group; Step 3: Gearbox suitable temperature analysis: According to the suitable temperature test information corresponding to each suitable temperature test group, analyze the operation compliance index of the gearbox corresponding to each suitable temperature test group, and screen out the actual suitable temperature corresponding to the gearbox to be tested, and at the same time determine whether the standard suitable operating temperature of the gearbox of the vehicle to be tested is accurate; Step 4: High-temperature test of the gearbox: Based on the standard maximum temperature corresponding to the gearbox to be tested, each high-temperature test group is set, and then each high-temperature test group is tested at high temperature in the test scenario, so as to collect high-temperature test information corresponding to each high-temperature test group; Step 5: Gearbox high temperature analysis: Based on the corresponding high temperature test information in each high temperature test group, analyze the operation safety index of the gearbox to be tested under each high temperature test group, and screen out the actual maximum temperature corresponding to the gearbox to be tested, and determine whether the standard maximum temperature of the gearbox to be tested is accurate; Step 6. Test result display: Display whether the standard suitable temperature and standard maximum temperature of the gearbox to be tested are accurate, and display the corresponding suitable operating temperature and upper operating limit temperature of the gearbox to be tested.

2. A gearbox temperature testing method according to claim 1, characterized in that: In step 2, a temperature adaptation test is performed, and the specific test process is as follows: S1. Set the test temperature corresponding to each temperature-appropriate test group according to the standard suitable working temperature of the gearbox to be tested and the set temperature difference, and then put each gearbox to be tested into each temperature-appropriate test group test vehicle in the test field in turn; S2. According to the test temperature corresponding to each temperature test group and the reference gearbox temperature corresponding to each driving speed, the driving speed of the test vehicle corresponding to each temperature test group is obtained, and then the test vehicle corresponding to each temperature test group is controlled to travel at its driving speed, and after driving for a preset time, the driving speed of the test vehicle corresponding to each temperature test group is increased according to the preset driving speed increase value, and after the acceleration is completed, the driving time is preset to complete the temperature test of each temperature test group, and then the temperature test information corresponding to each temperature test group of the gearbox corresponding to the tested vehicle is collected. The temperature test information corresponding to each temperature test group of the gearbox corresponding to the tested vehicle includes the gearbox shift response speed corresponding to each temperature test group at each time point and the noise decibel generated in the gearbox operating state.

3. A gearbox temperature testing method according to claim 1, characterized in that: The analysis of the operation compliance index of the gearbox to be tested under each temperature test group is as follows: Substitute the gearbox shift response speed of the gearbox to be tested in each temperature test group corresponding to each time point in the test field and the noise decibel generated under the gearbox operation state into the calculation formula Get the operation compliance index ξ of the gearbox to be tested under each temperature test group i , where A t i , B t i They respectively represent the gearbox shift response speed corresponding to the i-th temperature test group at the t-th time point and the noise decibel generated in the gearbox operation state, i represents the number corresponding to each temperature test group, i=1, 2..., n, n is any integer greater than 2, t represents the number corresponding to each time point, t=2,..., m, m is any integer greater than 2, A i t-1 , B i t-1 They respectively represent the gearbox shift response speed and the noise decibel generated under the gearbox operating state of the i-th suitable temperature test group at the t-1th time point, ΔA and ΔB are the set allowable gearbox shift response speed difference and the allowable gearbox operating state noise decibel difference, μ1 and μ2 are the weight factors corresponding to the set gearbox shift response speed and the noise decibel generated under the gearbox operating state, respectively.

4. A gearbox temperature testing method according to claim 3, characterized in that: The actual suitable temperature corresponding to the gearbox to be tested is screened out, and at the same time, whether the standard suitable working temperature of the gearbox of the vehicle to be tested is accurate is determined. The specific process is as follows: Compare the operation compliance index of the gearbox to be tested in each suitable temperature test group with the preset operation compliance index threshold value. If the operation compliance index of the gearbox to be tested in a certain suitable temperature test group is greater than or equal to the preset operation compliance index threshold value, then the temperature in the suitable temperature test group is judged to be a suitable temperature; The operation compliance indexes of the gearboxes to be tested in each suitable temperature test group are sorted in descending order, and the temperature in the suitable temperature test group corresponding to the first-ranked operation compliance index is used as the actual temperature corresponding to the gearbox to be tested; The actual temperature corresponding to the gearbox to be tested is compared with the standard optimum temperature. If the actual temperature corresponding to the gearbox to be tested is the same as the standard optimum temperature, it is determined that the standard optimum temperature of the gearbox to be tested is accurate; otherwise, it is determined that the standard optimum temperature of the gearbox to be tested is inaccurate.

5. A gearbox temperature testing method according to claim 4, characterized in that: In step 4, a high temperature test is performed, and the specific test process is as follows: A1. Set the test temperature corresponding to each high temperature test group according to the standard maximum temperature corresponding to the gearbox to be tested and the set temperature difference, and then put each gearbox to be tested into the test vehicle of each high temperature test group in the test field in turn; A2. According to the test temperature corresponding to each high-temperature test group and the reference gearbox temperature corresponding to each driving speed, the driving speed of the test vehicle corresponding to each high-temperature test group is obtained, and then the test vehicle corresponding to each high-temperature test group is controlled to travel at its driving speed, and after driving for a preset time, the driving speed of the test vehicle corresponding to each high-temperature test group is increased according to the preset driving speed increase value. After the driving speed of the test vehicle reaches the set maximum speed, it drives for a preset time to complete the high-temperature test of each high-temperature test group, and then the high-temperature test information corresponding to each high-temperature test group of the gearbox corresponding to the vehicle to be tested is collected. The high-temperature test information corresponding to each high-temperature test group of the gearbox corresponding to the vehicle to be tested includes gearbox oil concentration, hydraulic pressure in the gearbox, apparent image of the gearbox to be tested, carbon monoxide concentration and nitrogen concentration at the gearbox.

6. A gearbox temperature testing method according to claim 5, characterized in that: The analysis of the operation compliance index of the gearbox to be tested under each high temperature test group is as follows: According to the gearbox oil concentration and gearbox hydraulic pressure corresponding to each high temperature test group in the test field, the first operation compliance index corresponding to the gearbox under each high temperature test group is obtained, which is recorded as Wherein j represents the number corresponding to each high temperature test group, j=1, 2...x, x is any integer greater than 2; According to the apparent image of the gearbox to be tested corresponding to each high temperature test group in the test field, the carbon monoxide concentration and the nitrogen concentration in the test field, the operation safety compliance index corresponding to the gearbox to be tested under each high temperature test group is analyzed and obtained, which is recorded as By calculating the formula Get each high temperature test group Operational safety index of the gearbox to be tested Among them, ε1 and ε2 are the weight factors corresponding to the set first operation compliance index and operation safety compliance index respectively.

7. A gearbox temperature testing method according to claim 6, characterized in that: The specific calculation formula of the first operation compliance index corresponding to the gearbox to be tested in each high temperature test group is: Among them C t j , P t j are the gearbox oil concentration and gearbox hydraulic pressure corresponding to the jth high temperature test group at the tth time point, C j t-1 , P j t-1 They respectively represent the gearbox oil concentration and the gearbox hydraulic pressure corresponding to the j-th high temperature test group at the t-1th time point, ΔC and ΔP are the set allowable gearbox oil concentration difference and the allowable gearbox hydraulic pressure difference, η1 and η2 are the weight factors corresponding to the set gearbox oil concentration and the gearbox hydraulic pressure, respectively.

8. A gearbox temperature testing method according to claim 7, characterized in that: The analysis obtains the operation safety compliance index corresponding to the gearbox to be tested under each high temperature test group. The specific analysis process is as follows: Based on the apparent image of the gearbox to be tested corresponding to each high-temperature test group in the test field, the surface flatness compliance coefficient of the gearbox to be tested corresponding to each high-temperature test group is calculated and recorded as By calculating the formula Obtain the operation safety compliance index corresponding to the gearbox to be tested under each high temperature test group Among them j 、N j They respectively represent the carbon monoxide concentration and hydrogen concentration in the test field corresponding to the i-th high-temperature test group, co and N respectively represent the initial carbon monoxide concentration and initial nitrogen concentration in the test field, γ1, γ2, and γ3 are the weight factors corresponding to the set surface flatness compliance coefficient, carbon monoxide concentration, and nitrogen concentration, respectively.

9. A gearbox temperature testing method according to claim 8, characterized in that: The specific calculation formula for the surface flatness compliance coefficient of the gearbox to be tested corresponding to each high temperature test group is: Substitute the average roughness parameter of the gearbox surface and the height difference between the highest peak and the lowest valley on the gearbox surface into the calculation formula Obtain the surface flatness compliance coefficient of the gearbox to be tested corresponding to each high temperature test group Where E j 、F j are the average roughness parameter of the gearbox surface corresponding to the i-th high temperature test group, the height difference between the highest peak and the lowest valley on the gearbox surface, and E j ′、F j ′ is the standard average roughness parameter of the gearbox surface and the standard height difference between the highest peak and the lowest valley of the gearbox surface, ΔE and ΔF are the allowable average roughness parameter difference of the gearbox surface and the allowable height difference between the highest peak and the lowest valley of the gearbox surface, δ1 and δ2 are the weight factors corresponding to the average roughness parameter of the gearbox surface and the height difference between the highest peak and the lowest valley of the gearbox surface, respectively.

10. A gearbox temperature testing method according to claim 6, characterized in that: The actual upper limit temperature corresponding to the gearbox to be tested is screened out, and at the same time, it is determined whether the upper limit value of the standard maximum temperature of the gearbox to be tested is accurate. The specific process is as follows: The operation safety index of the gearbox to be tested in each high temperature test group is compared with the preset operation safety index threshold. If the operation safety index of the gearbox to be tested in a certain high temperature test group is greater than or equal to the preset operation safety index threshold, the temperature in the high temperature test group is judged to be a safe temperature, and the high temperature test group is recorded as a safe high temperature test group, so as to screen out various safe high temperature test groups; The operating safety indexes of the gearboxes to be tested in each safety high temperature test group are sorted in descending order, and the temperature in the safety high temperature test group corresponding to the first-ranked operating safety index is used as the actual temperature corresponding to the gearbox to be tested; The actual temperature corresponding to the gearbox to be tested is compared with the upper limit value of the standard maximum temperature. If the actual temperature corresponding to the gearbox to be tested is the same as the upper limit value of the standard maximum temperature, it is determined that the upper limit value of the standard maximum temperature of the gearbox to be tested is accurate; otherwise, it is determined that the upper limit value of the standard maximum temperature of the gearbox to be tested is inaccurate.

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