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

Abstract

The present application relates to gearbox detection technical field, especially to a kind of gearbox synchronizer dynamic performance detection system based on multimodal signal fusion, comprising: including the first simulation unit for simulating light load driving condition and the second simulation unit for simulating heavy load driving condition condition simulation module;Including synchronization duration acquisition unit and peak acquisition unit data acquisition module;To determine the performance level of synchronizer according to the running stability characteristic value of synchronizer state determination module;To determine the performance level of synchronizer according to the proportion of abnormal vibration peak under the condition that the performance level of synchronizer is second level processing module;To determine the reason why synchronizer is in third level according to the condition of synchronizer condition failure ratio under the condition that the performance level of synchronizer is third level strategy determination module.The present application improves the accuracy of synchronizer detection.

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:

[0009] 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;

[0010] 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 number of vibration peak values of the gearbox of the first simulation unit;

[0011] A state determination module connected to the data acquisition module, for determining the performance level of the synchronizer according to the running stability characteristic value of the synchronizer;

[0012] 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 the abnormal vibration peak value proportion twice under the condition that the performance level of the synchronizer is the second level;

[0013] 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 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.

[0014] Further, the first simulation unit repeats the gear shifting test of engaging a preset gear from neutral position several times under the condition that the first preset speed difference is maintained between the input shaft and the output shaft of the gearbox and the first preset load torque is applied;

[0015] The second simulation unit repeats the gear shifting test of engaging a preset gear from neutral position several times under the condition that the second preset speed difference is maintained between the input shaft and the output shaft of the gearbox and the second preset load torque is applied;

[0016] 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.

[0017] Further, the state determining module determines the performance level of the synchronizer according to the running stability characteristic value of the synchronizer, wherein,

[0018] If the running stability characteristic value is less than a first preset running stability threshold, the performance level of the synchronizer is determined as a first level.

[0019] 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 as a second level.

[0020] 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 as a third level.

[0021] 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.

[0022] Further, the running stability characteristic value is determined by the maximum value of the synchronization time length, the minimum value of the synchronization time length, the first synchronization time length average value of the first simulation unit, and the second synchronization time length average value of the second simulation unit.

[0023] 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 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. 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.

[0024] 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 characteristic value and the first preset running stability threshold.

[0025] Further, the processing module determines the performance level of the synchronizer according to the abnormal vibration peak value ratio, wherein,

[0026] 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.

[0027] 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.

[0028] 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.

[0029] Further, 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 amplitude for the detection interval period.

[0030] 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,

[0031] 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.

[0032] 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.

[0033] Further, the working condition failure ratio is a ratio of the number of shift tests in which the synchronization time of the synchronizer is greater than a preset synchronization time to the total number of shift tests under the condition that the first simulation unit performs a plurality of shift tests.

[0034] Compared with the prior art, the present application has the beneficial effects that the present application simulates two differentiated working conditions of light load and heavy load, and fuses two types of heterogeneous signals of synchronization time and vibration peak to construct a multi-dimensional detection data space. 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. A three-level performance level evaluation system is established to effectively identify the synchronizer in a critical state and predictive maintenance. The critical state synchronizer is confirmed again through the vibration signal, which reduces the risk of misjudgment caused by environmental interference or accidental factors, thereby improving the accuracy of the synchronizer detection.

[0035] 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 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.

[0036] Further, the application divides the performance into three grades of excellent, critical and failure by introducing the running stability characteristic value and three-level performance grade, instead of simple binary judgment, so that the detection system can effectively identify the critical state synchronizer whose performance has declined but has not completely failed, thereby realizing fine management of the health state of the synchronizer.

[0037] 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 testing, improves the accuracy of final judgment of the critical state synchronizer, and thereby avoids misjudgment caused by insufficient test intensity.

[0038] Further, the application makes secondary determination by vibration signal and adjusts the detection interval period, introduces the abnormal vibration peak ratio as a quantitative index of vibration state, makes the grade adjustment more objective, reduces the detection interval period for the synchronizer adjusted to the first grade, and can strengthen the subsequent monitoring of the synchronizer, thereby improving the intelligent level of the system. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 A module connection schematic diagram of the transmission synchronizer dynamic performance detection system based on multi-modal signal fusion of the embodiment of the application;

[0040] Figure 2 A flowchart for determining the performance grade of the synchronizer according to the running stability characteristic value of the synchronizer of the embodiment of the application;

[0041] Figure 3 A flowchart for determining the performance grade of the synchronizer according to the abnormal vibration peak ratio of the embodiment of the application;

[0042] Figure 4 A flowchart for determining the reason why the synchronizer is in the third grade of the embodiment of the application. DETAILED DESCRIPTION

[0043] In order to make the purpose and advantages of the application more clear and obvious, the application will be further described below in combination with embodiments; it should be understood that the specific embodiments described herein are only used to explain the application, and do not limit the application.

[0044] The preferred embodiments of the application will be 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 application, and are not intended to limit the protection scope of the application.

[0045] It should be noted that the data in the embodiment are obtained by comprehensive analysis and evaluation of historical detection data and corresponding historical detection results of the application in the three months before the detection. Those skilled in the art can understand that the determination method of the application for a single parameter can be to select the value with the highest proportion 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 by using the formula as the preset standard parameter, or other selection methods, as long as the application can clearly define different specific situations in the single determination process through the obtained value.

[0046] 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 application; a flowchart of determining the performance level of the synchronizer according to the running stability characteristic value of the synchronizer according to an embodiment of the application; a flowchart of determining the performance level of the synchronizer according to the abnormal vibration peak value proportion twice according to an embodiment of the application; and a flowchart of determining the reason why the synchronizer is in the third level according to an embodiment of the application.

[0047] An embodiment of the application provides a gearbox synchronizer dynamic performance detection system based on multi-modal signal fusion, comprising:

[0048] 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;

[0049] 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;

[0050] A state determination module connected with the data acquisition module, for determining the performance level of the synchronizer according to a running stability characteristic value of the synchronizer;

[0051] 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;

[0052] 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.

[0053] Specifically, the specific structure of the state determining module, the processing module and the strategy determining module is not limited, and each unit thereof can be composed of a logic component including a field programmable component, a computer or a microprocessor in the computer.

[0054] Specifically, the synchronization duration acquisition unit adopts a laser displacement sensor installed on the outside of the gearshift fork of the gearbox, and collects the displacement change curve of the gearshift fork from the neutral position to the 3rd gear engagement position in real time; the time difference from the start of displacement change to the stable displacement is recorded, that is, the single synchronization duration.

[0055] The peak acquisition unit adopts an acceleration sensor installed on the side of the gearbox housing close to the 3rd synchronizer, and collects the vibration acceleration signal of the gearbox housing during the gear shifting process; after filtering (low-pass filtering with a cutoff frequency of 1 kHz) the vibration signal, the maximum vibration acceleration in each gear shifting process is extracted, that is, the single vibration peak.

[0056] Specifically, the working condition simulation module is deployed on the gearbox test bench.

[0057] Specifically, the first simulation unit repeats the gear shifting test from the neutral gear to the preset 3rd gear under the condition that the first preset speed difference of 80 rpm is maintained between the input shaft and the output shaft of the gearbox and the first preset load torque of 200 N·m is applied.

[0058] The second simulation unit repeats the gear shifting test from the neutral gear to the preset gear under the condition that the second preset speed difference of 150 rpm is maintained between the input shaft and the output shaft of the gearbox and the second preset load torque of 500 N·m is applied.

[0059] 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.

[0060] In this embodiment, the synchronization duration of the first simulation unit refers to the synchronization duration measured in each gear shifting test under the light-load driving condition, that is, the first simulation unit; the synchronization duration of the second simulation unit refers to the synchronization duration measured in each gear shifting test under the heavy-load driving condition, that is, the second simulation unit; the synchronization duration is acquired by the synchronization duration acquisition unit in the data acquisition module, and the synchronization duration is the duration experienced by the synchronizer from the start of gear shifting action (that is, the gearshift fork starts to move) to the completion of synchronization process (that is, the rotational speed of the synchronization ring and the corresponding gear of the 3rd gear reaches consistency and engages).

[0061] Specifically, the repeating several times in the shift test of engaging the preset gear from the neutral position refers to the number of repetitions of the shift test, and in this embodiment, the number of repetitions is 10 times.

[0062] Specifically, the state determination module determines the performance level of the synchronizer according to the running stability characteristic value of the synchronizer.

[0063] If the running stability characteristic value is less than a first preset running stability threshold 0.35, it is determined that the performance level of the synchronizer is a first level.

[0064] 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 0.65, it is determined that the performance level of the synchronizer is a second level.

[0065] If the running stability characteristic 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.

[0066] 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.

[0067] Specifically, the first preset running stability threshold has a value range of [0.25, 0.45], and the second preset running stability threshold has a value range of [0.55, 0.75]. Preferably, the first preset running stability threshold has a value of 0.35, and the second preset running stability threshold has a value of 0.65.

[0068] Specifically, the running stability characteristic value comprehensively reflects the stability of the synchronizer under light load conditions and the anti-decay ability of the synchronizer under heavy load conditions. If the running stability characteristic value is less than the first preset running stability threshold, it is determined that the first level, indicating that the synchronization process of the synchronizer should be smooth and repeatable. If the running stability characteristic value is greater than or equal to the first preset running stability threshold and less than the second preset running stability threshold, it is determined that the second level, which is a warning zone for the performance of the synchronizer. If the running stability characteristic value is greater than or equal to the second preset running stability threshold, it indicates that the performance of the synchronizer has seriously declined.

[0069] Specifically, the running stability characteristic value is calculated by the following formula:

[0070]

[0071] 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 synchronization time of the first simulation unit; T 1minT1 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, α+β=1; T2 represents the second average value of the second synchronization duration of the second simulation unit.

[0072] Specifically, the first weight is less than the second weight. The light-load driving condition simulated by the first simulation unit mainly reflects the performance consistency of the synchronizer in a mild and ideal working condition. Even if there is slight wear of the synchronizer, the synchronization time of the synchronizer may remain stable under the light-load condition of low load and low speed difference, and the fluctuation is small. The heavy-load driving condition simulated by the second simulation unit directly reflects the performance retention capability of the synchronizer under the condition of approaching the working boundary and high stress state. By setting the second weight to be greater than the first weight, it is ensured that the running stability representation value can more sensitively capture the performance degradation of the synchronizer due to wear, aging and the like.

[0073] Specifically, 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 representation 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.

[0074] Specifically, the increase range of the second preset load torque in the second simulation unit is positively correlated with the running deviation value, wherein the positive correlation is, for example, linear positive correlation or nonlinear positive correlation. The linear slope of the linear positive correlation is not limited, and 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 representation value and the first preset running stability threshold.

[0075] Specifically, the processing module determines the performance level of the synchronizer according to the abnormal vibration peak value ratio, wherein,

[0076] If the abnormal vibration peak value ratio is less than a preset abnormal vibration peak value ratio 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 the difference between the preset abnormal vibration peak value ratio and the abnormal vibration peak value ratio.

[0077] 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.

[0078] The abnormal vibration peak ratio is a ratio of the number of abnormal vibration peaks to the total number of vibration peaks, wherein the number of abnormal vibration peaks is the number of peaks greater than the preset vibration peak 15 m / s 2 .

[0079] In this embodiment, the preset abnormal vibration peak ratio is selected as 0.25, but the above value is not limited thereto, and a person skilled in the art can also adjust the value according to actual needs; the preset abnormal vibration peak ratio is obtained based on experimental data statistical analysis, in the research and development stage, by collecting a large amount of vibration data of 50 normal synchronizers in the shifting process, analyzing the distribution of abnormal vibration peak ratio, determining the value with the most frequent occurrence of abnormal vibration peak ratio as the preset abnormal vibration peak ratio.

[0080] Specifically, the abnormal vibration peak ratio is used to distinguish between accidental fluctuations and systematic failures, and a single or a few abnormal peaks may be caused by random interference or accidental factors (such as a small amount of air bubbles in the oil, 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.

[0081] Specifically, when the secondary determination adjusts the performance level to the first level, the system does not simply "release", but will dynamically reduce the detection interval period according to the difference between the abnormal ratio and the threshold value, which means that the system considers that the synchronizer has "defects" but is temporarily reliable, so it needs to be paid more attention to.

[0082] 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,

[0083] 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;

[0084] 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;

[0085] 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;

[0086] The abnormal vibration deviation value is the difference between the preset abnormal vibration peak ratio and the abnormal vibration peak ratio.

[0087] 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 in the third level according to the working condition failure ratio of the synchronizer, wherein,

[0088] If the working condition failure ratio is less than a preset working condition failure ratio 0.40, the reason is that the synchronizer ring in the synchronizer is worn out.

[0089] 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.

[0090] 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 a 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.

[0091] Specifically, the preset working condition failure ratio is 0.40, 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 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 example, 50 times, and by counting the working condition failure ratio distribution corresponding to the synchronizer ring wear and the mechanical structure damage, the working condition failure ratio with the highest occurrence frequency is selected as the preset working condition failure ratio.

[0092] Specifically, the working condition failure ratio is calculated under light load conditions rather than heavy load conditions, only those synchronizers with serious mechanical structure damage will continue to fail, which makes the working condition failure ratio a highly sensitive indicator for distinguishing failure types.

[0093] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the drawings, but a person skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. A person skilled in the art can make equivalent changes or replacements to related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will fall within the protection scope of the present application.

[0094] The above description is only for 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 in 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 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; the processing module determines the performance level of the synchronizer according to the abnormal vibration peak value proportion, wherein if the abnormal vibration peak value proportion is less than a preset abnormal vibration peak value proportion, the performance level of the synchronizer is adjusted to a first level, and a 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, wherein the abnormal vibration peak value number is a peak value number of vibration peak values greater than a preset vibration peak value; the running stability characteristic value is calculated by the following formula: In the formula, P represents a running stability characteristic value; a represents a first weight, and a is set as 0.4; T 1max represents a maximum value of a synchronization duration of the first simulation unit; T 1min represents a minimum value of the synchronization duration of the first simulation unit; T1 represents an average value of the synchronization duration of the first simulation unit; β represents a second weight, and β is set as 0.6, and a+β=1; T2 represents a second average value of a second synchronization duration of a second simulation unit; 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 an abnormal vibration deviation value is less than a first preset abnormal vibration deviation value, the processing module reduces the detection interval period to a corresponding value by using a first adjustment coefficient; if the abnormal vibration deviation value is greater than or equal to the first preset abnormal vibration deviation value and less than a second preset abnormal vibration deviation value, the processing module reduces the detection interval period to a corresponding value by using a second adjustment coefficient; if the abnormal vibration deviation value is greater than or equal to the second preset abnormal vibration deviation value, the processing module reduces the detection interval period to a corresponding value by using a third adjustment coefficient; the abnormal vibration deviation value is a difference between the preset abnormal vibration peak value proportion and the abnormal vibration peak value proportion.

2. The multi-modal signal fusion based gearbox synchronizer dynamic performance detection system according to claim 1, wherein, the first simulation unit repeatedly performs a gear shifting test of engaging a preset gear from a neutral gear under the condition that a first preset 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 gear shifting test of engaging a preset gear from a neutral gear under the condition that a second preset 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 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 shift tests of the first simulation unit is the same as the number of shift tests of the second simulation unit.

3. The multi-modal signal fusion based gearbox synchronizer dynamic performance detection system according to claim 2, wherein, The state determination module determines the performance level of the synchronizer according to the operation stability characteristic value of the synchronizer, wherein, If the operation stability characteristic value is less than a first preset operation stability threshold, the performance level of the synchronizer is determined to be a first level; If the operation stability characteristic value is greater than or equal to the first preset operation stability threshold and less than a second preset operation stability threshold, the performance level of the synchronizer is determined to be a second level; If the operation stability characteristic value is greater than or equal to the second preset operation 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 multi-modal signal fusion based gearbox synchronizer dynamic performance detection system according to claim 3, wherein, The operation stability characteristic value is determined by the maximum value of the synchronization time of the first simulation unit, the minimum value of the synchronization time, the first synchronization time average value, and the second synchronization time average value 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 the second preset load torque in the second simulation unit according to the difference between the operation stability characteristic value and the first preset operation 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 again according to the abnormal vibration peak value ratio of the synchronizer under the increased heavy load driving condition.

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 the operation deviation value, wherein the operation deviation value is the difference between the operation stability characteristic value and the first preset operation stability threshold.

7. The multi-modal signal fusion based gearbox synchronizer dynamic performance detection system according to claim 6, 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 for the detection interval period.

8. The multi-modal signal fusion based gearbox synchronizer dynamic performance detection system according to claim 7, 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 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.

9. The multi-modal signal fusion based gearbox synchronizer dynamic performance detection system according to claim 8, wherein, The working condition failure ratio is the ratio of the number of shift tests in which the synchronization time of the synchronizer is greater than a preset synchronization time to the total number of shift tests under the condition that the first simulation unit performs a plurality of shift tests.

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