Gearbox synchronizer dynamic performance detection system based on multi-mode signal fusion

Abstract

The invention relates to the technical field of gearbox detection, in particular to a gearbox synchronizer dynamic performance detection system based on multi-modal signal fusion, comprising: a working condition simulation module comprising a first simulation unit for simulating a light-load driving working condition and a second simulation unit for simulating a heavy-load driving working condition; comprising a synchronization time length acquisition unit and a peak value acquisition unit; the state determining module is used for judging the performance grade of the synchronizer according to the operation stability characterization value of the synchronizer; the processing module is used for secondarily determining the performance grade of the synchronizer according to the abnormal vibration peak value proportion under the condition that the performance grade of the synchronizer is the second grade; and the strategy determination module is used for determining the reason of the synchronizer at the third grade according to the working condition failure ratio of the synchronizer under the condition that the performance grade of the synchronizer is the third grade. According to the invention, the synchronizer detection accuracy is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gearbox detection, and particularly relates to a gearbox synchronizer dynamic performance detection system based on multi-modal signal fusion. BACKGROUND

[0002] The gearbox synchronizer is a shift buffer component of a manual gearbox, and is essentially a precision mechanism composed of a synchronizer ring, a synchronizer cone, a coupling sleeve and the like. When shifting, the gearbox synchronizer makes the two gears to be engaged reach the same speed quickly, so as to avoid the gear impact sound caused by hard friction, and make the shift smoother and protect the gears from being worn.

[0003] The working principle of the gearbox synchronizer is that the synchronizer in the gearbox is used for the tooth or tooth engagement of the constant meshing gear. It makes a pair of gears have the same speed before engaging, so as to reduce the impact when the tooth engages. The synchronizer is a device for engaging the second shaft gear of the gearbox with the driving gear and the second shaft four / three gear by a set of metal friction cone and a set of tooth engagement.

[0004] As a core component of the vehicle transmission system, the performance of the gearbox synchronizer directly determines the shift quality, driving comfort and even the reliability of the transmission system. During long-term use, the key friction elements (such as the synchronizer ring) of the synchronizer will gradually wear out, resulting in an increase in synchronization time and shift impact, and even shift failure or gear impact in severe cases, which may cause mechanical failure. Therefore, it is very important to quickly, accurately and reliably detect the performance of the synchronizer during the production and quality detection of the gearbox.

[0005] Chinese patent application publication No. CN114001951A discloses a synchronizer detection system and method of a gearbox. The system comprises a gearbox body, an audio sensor and a control module; the gearbox body is in communication connection with the control module; the control module is used to drive the input shaft speed of the gearbox body to be a first preset speed and the output shaft speed of the gearbox body to be a second preset speed; the gearbox body comprises a shift fork position sensor; the shift fork position sensor is used to detect the synchronization position signal of the synchronizer when the input shaft speed is the first preset speed and the output shaft speed is the second preset speed; the audio sensor is arranged on one side of the gearbox body and is used to collect the audio signal of the gearbox body and its surrounding environment; the control module is further used to acquire the audio signal when the shift fork position sensor detects the synchronization position of the synchronizer and within a preset time after detecting the synchronization position of the synchronizer, and judge whether the synchronizer is abnormal according to the audio signal.

[0006] It can be seen that the above technical solution only uses a single fixed working condition and only relies on a single detection signal, and cannot simulate the performance difference of the synchronizer under different loads, has poor anti-interference ability, and thus causes the problem of poor detection accuracy of the synchronizer. SUMMARY

[0007] To this end, the application provides a gearbox synchronizer dynamic performance detection system based on multi-modal signal fusion, to overcome the problem that the prior art only uses a single fixed working condition and only relies on a single detection signal, cannot simulate the performance difference of the synchronizer under different loads, has poor anti-interference ability, and thus leads to poor synchronizer detection accuracy.

[0008] To achieve the above-mentioned purpose, the application provides a gearbox synchronizer dynamic performance detection system based on multi-modal signal fusion, comprising: a working condition simulation module, comprising a first simulation unit for simulating a light-load driving working condition and a second simulation unit for simulating a heavy-load driving working condition; a data acquisition module connected to the working condition simulation module, comprising a synchronization time length acquisition unit for acquiring synchronization time lengths of the first simulation unit and the second simulation unit respectively, and a peak value acquisition unit for acquiring a plurality of vibration peak values of the gearbox of the first simulation unit; a state determination module connected to the data acquisition module, for determining the performance grade of the synchronizer according to the running stability characteristic value of the synchronizer; a processing module connected to the working condition simulation module and the state determination module respectively, for determining the performance grade of the synchronizer according to the abnormal vibration peak value proportion twice under the condition that the performance grade of the synchronizer is the second grade; a strategy determination module connected to the state determination module and the processing module respectively, for determining the reason why the synchronizer is in the third grade according to the working condition failure ratio of the synchronizer under the condition that the performance grade of the synchronizer is the third grade.

[0009] Further, the first simulation unit repeatedly performs gear shifting tests from neutral to a preset gear position a plurality of times under the condition that the input shaft and the output shaft of the gearbox maintain a first preset speed difference and a first preset load torque is applied; the second simulation unit repeatedly performs gear shifting tests from neutral to a preset gear position a plurality of times under the condition that the input shaft and the output shaft of the gearbox maintain a second preset speed difference and a second preset load torque is applied; wherein the second preset speed difference is greater than the first preset speed difference, the second preset load torque is greater than the first preset load torque, and the number of gear shifting tests of the first simulation unit is the same as that of the second simulation unit.

[0010] Further, the state determination module determines the performance grade of the synchronizer according to the running stability characteristic value of the synchronizer, wherein, If the running stability characterization value is less than the first preset running stability threshold, it is determined that the performance level of the synchronizer is a first level. If the running stability characterization value is greater than or equal to the first preset running stability threshold and less than a second preset running stability threshold, it is determined that the performance level of the synchronizer is a second level. If the running stability characterization value is greater than or equal to the second preset running stability threshold, it is determined that the performance level of the synchronizer is a third level. The first level indicates that the performance of the synchronizer is higher than the second level, and the second level indicates that the performance of the synchronizer is higher than the third level.

[0011] Further, the running stability characterization value is determined by the maximum value of the synchronization time length of the first simulation unit, the minimum value of the synchronization time length, the first average value of the synchronization time length, and the second average value of the synchronization time length of the second simulation unit.

[0012] Further, under the condition that the performance level of the synchronizer is the second level, the processing module increases the second preset load torque in the second simulation unit according to the difference between the running stability characterization value and the first preset running stability threshold, and instructs the second simulation unit to simulate a heavy load driving condition based on the increased second preset load torque. The processing module determines the performance level of the synchronizer according to the abnormal vibration peak value ratio of the synchronizer under the increased heavy load driving condition.

[0013] Further, the increase range of the second preset load torque in the second simulation unit is positively correlated with the running deviation value, wherein the running deviation value is the difference between the running stability characterization value and the first preset running stability threshold.

[0014] Further, the processing module determines the performance level of the synchronizer according to the abnormal vibration peak value ratio, wherein, If the abnormal vibration peak value ratio is less than a preset abnormal vibration peak value ratio, the performance level of the synchronizer is adjusted to the first level, and the detection interval period of the synchronizer is reduced according to the difference between the preset abnormal vibration peak value ratio and the abnormal vibration peak value ratio. If the abnormal vibration peak value ratio is greater than or equal to the preset abnormal vibration peak value ratio, the performance level of the synchronizer is reduced to the third level. The abnormal vibration peak value ratio is the ratio of the number of abnormal vibration peak values to the total number of vibration peak values, wherein the number of abnormal vibration peak values is the number of peak values greater than a preset vibration peak value.

[0015] Further, the processing module is provided with several cycle adjustment modes for the reduction of the detection interval period of the synchronizer, and each cycle adjustment mode is different in the reduction amplitude of the detection interval period.

[0016] Further, under the condition that the performance level of the synchronizer is the third level, the strategy determination module determines the reason why the synchronizer is at the third level according to the working condition failure ratio of the synchronizer, wherein, if the working condition failure ratio is less than a preset working condition failure ratio, the reason is that the synchronizer ring in the synchronizer is worn out; if the working condition failure ratio is greater than or equal to the preset working condition failure ratio, the reason is that the mechanical structure of the synchronizer is damaged.

[0017] Further, the working condition failure ratio is the ratio of the number of gear shifting tests in which the synchronization time of the synchronizer is greater than a preset synchronization time to the total number of gear shifting tests under the condition that the first simulation unit performs several gear shifting tests.

[0018] Compared with the prior art, the beneficial effects of the present application are that the present application constructs a multi-dimensional detection data space by simulating two differentiated working conditions of light load and heavy load and fusing two types of heterogeneous signals of synchronization time and vibration peak value. This multi-modal fusion method overcomes the one-sidedness and contingency caused by single working condition and single signal source, so that the detection result can more comprehensively reflect the comprehensive performance of the synchronizer. The establishment of a three-level performance level evaluation system effectively identifies the synchronizer in a critical state and predictive maintenance. The secondary confirmation of the critical state synchronizer by the vibration signal reduces the risk of misjudgment caused by environmental interference or accidental factors, thereby improving the accuracy of the synchronizer detection.

[0019] Further, the present application clearly distinguishes the differences between light load and heavy load working conditions and ensures the fairness of the test number. This design enables the performance evaluation to be based on comparable data, which can not only test the stability of the synchronizer under normal conditions, but also test its extreme working capacity and durability, simulating the full scene of smooth driving and intense driving of users, thereby achieving comprehensive evaluation of the synchronizer.

[0020] Further, the present application introduces the running stability representation value and the three-level performance level, and divides the performance into three levels of excellent, critical and failure, instead of simple binary judgment, so that the detection system can effectively identify the synchronizer in a critical state whose performance has declined but has not completely failed, thereby realizing the fine management of the health state of the synchronizer.

[0021] Further, the application designs a dynamic weighting test mechanism for the second-grade synchronizer, automatically increases the load torque, simulates more severe working conditions to trigger potential defects that may be hidden under regular tests, improves the accuracy of the final judgment on the critical state synchronizer, and thus avoids misjudgment caused by insufficient test strength.

[0022] Further, the application performs secondary determination through the vibration signal and adjusts the detection interval period, introduces the abnormal vibration peak value ratio as a quantitative index of the vibration state, makes the grade adjustment more objective, reduces the detection interval period for the synchronizer adjusted to the first grade, and thus strengthens the subsequent monitoring of the synchronizer, thereby improving the intelligent level of the system. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A module connection schematic diagram of a gearbox synchronizer dynamic performance detection system based on multi-modal signal fusion according to an embodiment of the application; Figure 2 A flowchart of determining the performance grade of the synchronizer according to the running stability characteristic value of the synchronizer according to an embodiment of the application; Figure 3 A flowchart of determining the performance grade of the synchronizer according to the abnormal vibration peak value ratio according to an embodiment of the application; Figure 4 A flowchart of determining the reason why the synchronizer is in the third grade according to an embodiment of the application. DETAILED DESCRIPTION

[0024] In order to make the objects and advantages of the present application clearer, the following further describes the present application with reference to the embodiments; it should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the protection scope of the present application.

[0025] The preferred embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and do not limit the protection scope of the present application.

[0026] It should be pointed out that the data in the present embodiment are obtained by comprehensive analysis and evaluation of historical detection data and corresponding historical detection results of the present application in the past three months before the present detection. Those skilled in the art can understand that the determination method of the present application for a single parameter can be to select the value with the highest ratio as the preset standard parameter according to the data distribution, to use weighted summation to obtain the value as the preset standard parameter, to substitute each historical data into a specific formula and to obtain the value as the preset standard parameter using the formula, or other selection methods, as long as the present application can clearly define different specific conditions in the single determination process through the obtained value.

[0027] Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , which are respectively a module connection diagram of a gearbox synchronizer dynamic performance detection system based on multi-modal signal fusion according to an embodiment of the present application; a flowchart for determining the performance level of the synchronizer according to the running stability characteristic value of the synchronizer; a flowchart for determining the performance level of the synchronizer according to the abnormal vibration peak value proportion twice; and a flowchart for determining the reason why the synchronizer is in the third level according to an embodiment of the present application.

[0028] An embodiment of the present application provides a gearbox synchronizer dynamic performance detection system based on multi-modal signal fusion, comprising: a working condition simulation module, comprising a first simulation unit for simulating a light-load driving working condition and a second simulation unit for simulating a heavy-load driving working condition; a data acquisition module connected with the working condition simulation module, comprising a synchronization time length acquisition unit for acquiring synchronization time lengths of the first simulation unit and the second simulation unit respectively and a peak value acquisition unit for acquiring a plurality of vibration peak values of the gearbox of the first simulation unit; a state determination module connected with the data acquisition module, for determining the performance level of the synchronizer according to the running stability characteristic value of the synchronizer; a processing module connected with the working condition simulation module and the state determination module respectively, for determining the performance level of the synchronizer according to the abnormal vibration peak value proportion twice under the condition that the performance level of the synchronizer is the second level; a strategy determination module connected with the state determination module and the processing module respectively, for determining the reason why the synchronizer is in the third level according to the working condition failure ratio of the synchronizer under the condition that the performance level of the synchronizer is the third level.

[0029] Specifically, the specific structure of the state determination module, the processing module and the strategy determination module is not limited, and each unit thereof can be composed of a logic component, which includes a field programmable component, a computer or a microprocessor in the computer.

[0030] Specifically, the synchronization time length acquisition unit adopts a laser displacement sensor installed on the outside of the gearbox fork to collect the displacement change curve of the fork from the neutral position to the 3-gear engagement position in real time; and records the time difference from the start of displacement change to the stable displacement, which is the single synchronization time length.

[0031] The peak acquisition unit is installed on the side of the gearbox shell near the 3rd synchronizer, and collects the vibration acceleration signal of the gearbox shell during the gear shifting process. After filtering (low-pass filtering, cutoff frequency 1 kHz) of the vibration signal, the maximum vibration acceleration value in each gear shifting process is extracted, which is the single vibration peak value.

[0032] Specifically, the working condition simulation module is arranged on the gearbox test bench.

[0033] Specifically, the first simulation unit repeatedly performs the gear shifting test of engaging the 3rd gear from the neutral gear under the condition that the first preset speed difference 80 rpm is maintained between the input shaft and the output shaft of the gearbox and the first preset load torque 200 N·m is applied. The second simulation unit repeatedly performs the gear shifting test of engaging the preset gear from the neutral gear under the condition that the second preset speed difference 150 rpm is maintained between the input shaft and the output shaft of the gearbox and the second preset load torque 500 N·m is applied. The second preset speed difference is greater than the first preset speed difference, the second preset load torque is greater than the first preset load torque, and the number of gear shifting tests of the first simulation unit is the same as that of the second simulation unit.

[0034] In this embodiment, the synchronization time of the first simulation unit refers to the synchronization time measured in each gear shifting test under the light-load driving condition, i.e., the first simulation unit; the synchronization time of the second simulation unit refers to the synchronization time measured in each gear shifting test under the heavy-load driving condition, i.e., the second simulation unit; the synchronization time is obtained by the synchronization time acquisition unit in the data acquisition module, and the synchronization time is the time period experienced by the synchronizer from the start of the gear shifting action (i.e., the start of the movement of the fork) to the completion of the synchronization process (i.e., the rotational speed of the synchronization ring and the corresponding gear of the 3rd gear reaches consistency and engages).

[0035] Specifically, the repeated number of times in the repeated gear shifting test of engaging the preset gear from the neutral gear refers to the number of repetitions of the gear shifting test. In this embodiment, the number of repetitions is 10.

[0036] Specifically, the state determination module determines the performance level of the synchronizer according to the running stability representation value of the synchronizer, wherein, If the running stability representation value is less than the first preset running stability threshold 0.35, it is determined that the performance level of the synchronizer is the first level. If the running stability representation value is greater than or equal to the first preset running stability threshold and less than the second preset running stability threshold 0.65, it is determined that the performance level of the synchronizer is the second level. If the running stability representation value is greater than or equal to the second preset running stability threshold, it is determined that the performance level of the synchronizer is the third level. wherein the first level indicates that the performance of the synchronizer is higher than the second level, and the second level indicates that the performance of the synchronizer is higher than the third level.

[0037] Specifically, the first preset running stability threshold value is in the range of [0.25, 0.45], and the second preset running stability threshold value is in the range of [0.55, 0.75], preferably, the first preset running stability threshold value is 0.35, and the second preset running stability threshold value is 0.65.

[0038] Specifically, the running stability characteristic value comprehensively reflects the stability of the synchronizer under light load working conditions and the anti-decay ability of the synchronizer under heavy load working conditions. When the running stability characteristic value is less than the first preset running stability threshold value, i.e., the first level, it indicates that the synchronization process of the synchronizer should be smooth and have good repeatability. When the running stability characteristic value is greater than or equal to the first preset running stability threshold value and less than the second preset running stability threshold value, i.e., the second level, this interval is a performance warning zone of the synchronizer. When the running stability characteristic value is greater than or equal to the second preset running stability threshold value, it indicates that the performance of the synchronizer has seriously declined.

[0039] Specifically, the running stability characteristic value is calculated by the following formula:

[0040] In the formula, P represents the running stability characteristic value, a represents the first weight, and a is set to 0.4; T 1max represents the maximum value of the synchronization duration of the first simulation unit; T 1min represents the minimum value of the synchronization duration of the first simulation unit; T1 represents the average value of the synchronization duration of the first simulation unit; β represents the second weight, and β is set to 0.6, and a+β=1; T2 represents the average value of the second synchronization duration of the second simulation unit.

[0041] Specifically, the first weight is less than the second weight. The light load driving working condition simulated by the first simulation unit mainly reflects the performance consistency of the synchronizer under mild and ideal working conditions. Even if a synchronizer has slight wear, its synchronization time may still remain stable and have small fluctuations under light load conditions with low load and low speed difference. The heavy load driving working condition simulated by the second simulation unit directly reflects the performance retention ability of the synchronizer under a high stress state close to its working boundary. By setting the second weight to be greater than the first weight, it is ensured that the running stability characteristic value can more sensitively capture the performance decay of the synchronizer caused by wear, aging, etc.

[0042] Specifically, under the condition that the performance level of the synchronizer is the second level, the processing module increases a second preset load torque in the second simulation unit according to a difference between the running stability characteristic value and the first preset running stability threshold, and instructs the second simulation unit to simulate a heavy load driving condition based on the increased second preset load torque, and the processing module determines the performance level of the synchronizer according to the abnormal vibration peak value proportion of the synchronizer under the heavy load driving condition.

[0043] Specifically, the increase range of the second preset load torque in the second simulation unit is positively correlated with the running deviation value, where the positive correlation is, for example, linear positive correlation or nonlinear positive correlation, and the linear slope of the linear positive correlation is not specifically limited. It can be understood that the greater the running deviation value, the greater the increase range of the second preset load torque in the second simulation unit. The running deviation value is the difference between the running stability characteristic value and the first preset running stability threshold.

[0044] Specifically, the processing module determines the performance level of the synchronizer according to the abnormal vibration peak value proportion twice. If the abnormal vibration peak value proportion is less than a preset abnormal vibration peak value proportion 0.25, the performance level of the synchronizer is adjusted to the first level, and the detection interval period of the synchronizer is reduced according to a difference between the preset abnormal vibration peak value proportion and the abnormal vibration peak value proportion. If the abnormal vibration peak value proportion is greater than or equal to the preset abnormal vibration peak value proportion, the performance level of the synchronizer is reduced to the third level. The abnormal vibration peak value proportion is a ratio of an abnormal vibration peak value number to a total vibration peak value number, where the abnormal vibration peak value number is a peak value number whose vibration peak value is greater than a preset vibration peak value 15 m / s 2 .

[0045] In this embodiment, the preset abnormal vibration peak value proportion is selected as 0.25, but the above value is not limited thereto, and a person skilled in the art can adjust the value according to actual needs. The preset abnormal vibration peak value proportion is obtained based on experimental data statistical analysis. In the research and development stage, a large amount of vibration data of 50 normal synchronizers in the shifting process is collected, the distribution of the abnormal vibration peak value proportion is analyzed, and the value with the most occurrence times of the abnormal vibration peak value proportion is determined as the preset abnormal vibration peak value proportion.

[0046] Specifically, the abnormal vibration peak proportion is used to distinguish accidental fluctuations from systematic failures. A single or a few abnormal peaks may be caused by random interference or accidental factors (such as a small bubble in the oil or an accidental impact in the test environment); but if the frequency of abnormal peaks is too high, it indicates that there is a persistent and systematic problem.

[0047] Specifically, when the secondary determination adjusts the performance level to the first level, the system does not simply "release" but dynamically reduces the detection interval period according to the difference between the abnormal proportion and the threshold, which means that the system considers that the synchronizer has "flaws" but is temporarily reliable, so it needs to be closely monitored. Specifically, the processing module is provided with a plurality of period adjustment modes for the reduction of the detection interval period of the synchronizer, wherein, If the abnormal vibration deviation value is less than the first preset abnormal vibration deviation value 0.08, the processing module uses the first adjustment coefficient 0.96 to reduce the detection interval period to the corresponding value; If the abnormal vibration deviation value is greater than or equal to the first preset abnormal vibration deviation value and less than the second preset abnormal vibration deviation value 0.11, the processing module uses the second adjustment coefficient 0.94 to reduce the detection interval period to the corresponding value; If the abnormal vibration deviation value is greater than or equal to the second preset abnormal vibration deviation value, the processing module uses the third adjustment coefficient 0.92 to reduce the detection interval period to the corresponding value; The abnormal vibration deviation value is the difference between the preset abnormal vibration peak proportion and the abnormal vibration peak proportion.

[0048] Specifically, under the condition that the performance level of the synchronizer is the third level, the strategy determination module determines the reason why the synchronizer is at the third level according to the working condition failure ratio of the synchronizer, wherein, If the working condition failure ratio is less than the preset working condition failure ratio 0.40, the reason is that the synchronizer ring in the synchronizer is worn out; If the working condition failure ratio is greater than or equal to the preset working condition failure ratio, the reason is that the mechanical structure of the synchronizer is damaged.

[0049] Specifically, the working condition failure ratio is the ratio of the number of gear shifting tests in which the synchronization time of the synchronizer is greater than the preset synchronization time 0.8s to the total number of gear shifting tests under the condition that the first simulation unit performs a plurality of gear shifting tests.

[0050] Specifically, the preset working condition failure ratio is 0.40, but the above value is not limited thereto, and the person skilled in the art can also adjust the value according to actual needs; the preset working condition failure ratio is determined based on historical failure data, by collecting a large number of working condition failure ratios when the synchronizer fails for 50 times, counting the working condition failure ratio distribution corresponding to the synchronizer ring wear and mechanical structure damage, and selecting the working condition failure ratio with the most occurrences as the preset working condition failure ratio.

[0051] Specifically, the working condition failure ratio is calculated under light load conditions rather than heavy load conditions, and only those synchronizers with severe mechanical structure damage will continue to fail, which makes the working condition failure ratio a highly sensitive indicator for distinguishing failure types.

[0052] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the drawings, but the person skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. The person skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after such changes or replacements will fall within the protection scope of the present application.

[0053] The above description is only the preferred embodiments of the present application and is not intended to limit the present application; for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included within the protection scope of the present application.

Claims

1. A gearbox synchronizer dynamic performance detection system based on multi-modal signal fusion, characterized in that, The method comprises the following steps: a working condition simulation module, comprising a first simulation unit for simulating a light-load driving working condition and a second simulation unit for simulating a heavy-load driving working condition; a data acquisition module connected to the working condition simulation module, comprising a synchronization time length acquisition unit for acquiring synchronization time lengths of the first simulation unit and the second simulation unit respectively and a peak value acquisition unit for acquiring a plurality of vibration peak values of a gearbox of the first simulation unit; a state determination module connected to the data acquisition module, for determining a performance level of the synchronizer according to a running stability characteristic value of the synchronizer; a processing module connected to the working condition simulation module and the state determination module respectively, for determining the performance level of the synchronizer according to an abnormal vibration peak value proportion twice on the condition that the performance level of the synchronizer is a second level; a strategy determination module connected to the state determination module and the processing module respectively, for determining a reason why the synchronizer is in a third level according to a working condition failure ratio of the synchronizer on the condition that the performance level of the synchronizer is the third level.

2. The gearbox synchronizer dynamic performance detection system based on multi-modal signal fusion according to claim 1, characterized in that, The first simulation unit repeatedly performs a shift test of engaging a preset gear from a neutral gear a plurality of times on the condition that a first preset rotational speed difference is maintained between an input shaft and an output shaft of a gearbox and a first preset load torque is applied. The second simulation unit repeatedly performs a shift test of engaging a preset gear from a neutral gear a plurality of times on the condition that a second preset rotational speed difference is maintained between an input shaft and an output shaft of a gearbox and a second preset load torque is applied. The second preset rotational speed difference is greater than the first preset rotational speed difference, the second preset load torque is greater than the first preset load torque, and the number of shift tests of the first simulation unit is the same as that of the second simulation unit.

3. The gearbox synchronizer dynamic performance detection system based on multi-modal signal fusion according to claim 2, characterized in that, The state determination module determines the performance level of the synchronizer according to a running stability characteristic value of the synchronizer, wherein if the running stability characteristic value is less than a first preset running stability threshold, the performance level of the synchronizer is determined to be a first level; if the running stability characteristic value is greater than or equal to the first preset running stability threshold and less than a second preset running stability threshold, the performance level of the synchronizer is determined to be a second level; if the running stability characteristic value is greater than or equal to the second preset running stability threshold, the performance level of the synchronizer is determined to be a third level; The first level indicates that the performance of the synchronizer is higher than the second level, and the second level indicates that the performance of the synchronizer is higher than the third level.

4. The gearbox synchronizer dynamic performance detection system based on multi-modal signal fusion according to claim 3, characterized in that, The running stability characteristic value is determined by a maximum synchronization time length, a minimum synchronization time length, a first synchronization time length average of the first simulation unit, and a second synchronization time length average of the second simulation unit.

5. The multi-modal signal fusion based gearbox synchronizer dynamic performance detection system according to claim 4, wherein, Under the condition that the performance level of the synchronizer is the second level, the processing module increases a second preset load torque in the second simulation unit according to a difference between the running stability characteristic value and the first preset running stability threshold, and instructs the second simulation unit to simulate a heavy load driving condition based on the increased second preset load torque, and the processing module determines the performance level of the synchronizer according to the abnormal vibration peak proportion of the synchronizer under the heavy load driving condition again.

6. The multi-modal signal fusion based gearbox synchronizer dynamic performance detection system according to claim 5, wherein, The increase range of the second preset load torque in the second simulation unit is positively correlated with a running deviation value, wherein the running deviation value is a difference between the running stability characteristic value and the first preset running stability threshold.

7. The multi-modal signal fusion based gearbox synchronizer dynamic performance detection system according to claim 6, wherein, The processing module determines the performance level of the synchronizer according to the abnormal vibration peak proportion again, wherein, if the abnormal vibration peak proportion is less than a preset abnormal vibration peak proportion, the performance level of the synchronizer is adjusted to the first level, and a detection interval period of the synchronizer is reduced according to a difference between the preset abnormal vibration peak proportion and the abnormal vibration peak proportion; if the abnormal vibration peak proportion is greater than or equal to the preset abnormal vibration peak proportion, the performance level of the synchronizer is reduced to the third level; the abnormal vibration peak proportion is a ratio of an abnormal vibration peak number to a total vibration peak number, wherein the abnormal vibration peak number is a peak number of vibration peaks greater than a preset vibration peak.

8. The multi-modal signal fusion based gearbox synchronizer dynamic performance detection system according to claim 7, wherein, The processing module is provided with a plurality of cycle adjustment modes for the reduction of the detection interval period of the synchronizer, and each cycle adjustment mode has a different reduction range of the detection interval period.

9. The multi-modal signal fusion based gearbox synchronizer dynamic performance detection system according to claim 8, wherein, Under the condition that the performance level of the synchronizer is the third level, the strategy determination module determines the reason why the synchronizer is in the third level according to a working condition failure ratio of the synchronizer, wherein, if the working condition failure ratio is less than a preset working condition failure ratio, the reason is that a synchronizing ring in the synchronizer is worn out; if the working condition failure ratio is greater than or equal to the preset working condition failure ratio, the reason is that a mechanical structure of the synchronizer is damaged.

10. The multi-modal signal fusion based gearbox synchronizer dynamic performance detection system of claim 9, wherein, The working condition failure ratio is a ratio of a number of times that a synchronization time of the synchronizer is greater than a preset synchronization time to a total number of times of shift tests under the condition that the first simulation unit performs a plurality of shift tests.

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