Automatic gearbox gear shifting quality evaluation method and device, electronic equipment and medium

Abstract

The embodiment of the invention relates to the technical field of vehicle vibration comfort evaluation, and discloses an automatic gearbox gear shifting quality evaluation method and device, electronic equipment and a medium. The method comprises the steps that the gear shifting evaluation working condition of the AMT is designed; collecting vehicle state parameters and a vibration acceleration signal of each gear shifting evaluation working condition under a set frequency; performing a preprocessing operation on the vibration acceleration signal to obtain a standard vibration acceleration signal; segmenting the standard vibration acceleration signal into at least one transient signal segment based on the vehicle state parameter; calculating at least one dimension evaluation index of each transient signal segment, and determining a comprehensive total weighted value of the current transient signal segment based on all dimension evaluation indexes; and gear shifting quality evaluation of the AMT is completed according to all the comprehensive total weighted values of all the transient signal segments. The AMT gear shifting quality evaluation standard can be standardized, and the evaluation accuracy is improved.

Description

Technical Field

[0001] This invention relates to the field of vehicle vibration comfort evaluation technology, and in particular to an automatic transmission shift quality evaluation method, device, electronic device and medium. Background Technology

[0002] With the increasing demands for driving comfort in the commercial vehicle industry, the shifting quality of automated mechanical transmissions (AMT), as a core transmission component of commercial vehicles, directly impacts driver efficiency, physical and mental health, and driving safety, becoming a key indicator for measuring a vehicle's overall competitiveness. Existing AMT shifting quality evaluation methods suffer from two major problems: First, evaluation relies on the subjective judgment of engineers, with different individuals having varying definitions of shift shocks and jerks, lacking a unified quantitative standard; second, existing evaluation methods primarily focus on vibrations caused by road surface excitation, failing to adequately address vibrations generated by the powertrain system (engine torque variations, gear meshing, clutch engagement, etc.) during AMT shifting, and thus cannot accurately capture transient vibration characteristics under shifting conditions. This leads to a disconnect between evaluation results and actual driving experience, making it difficult to effectively guide AMT shifting performance optimization. Summary of the Invention

[0003] The purpose of this invention is to provide an automatic transmission shift quality evaluation method, device, electronic device and medium, so as to at least solve the problems of strong subjectivity and poor pertinence of existing evaluation methods, which will help to standardize the AMT shift quality evaluation standard, improve the evaluation accuracy and protect the user's driving experience.

[0004] To address the aforementioned technical problems, in a first aspect, the present invention provides a method for evaluating the shift quality of an automatic transmission, comprising at least:

[0005] Design shift evaluation conditions for automatic manual transmission (AMT);

[0006] Collect vehicle status parameters and vibration acceleration signals at a set frequency for each of the aforementioned shift evaluation conditions;

[0007] Perform preprocessing on the vibration acceleration signal to obtain a standard vibration acceleration signal;

[0008] Based on the vehicle state parameters, the standard vibration acceleration signal is divided into at least one transient signal segment;

[0009] Calculate at least one dimension evaluation index for each transient signal segment, and determine the overall weighted value of the current transient signal segment based on all the dimension evaluation indices;

[0010] The shift quality evaluation of the AMT is completed based on the comprehensive weighted value of all transient signal segments.

[0011] Optionally, before collecting the vehicle state parameters and the vibration acceleration signal at a set frequency for each of the shift evaluation conditions, the method further includes:

[0012] External measuring points for the vibration acceleration signal are arranged outside the ATM vehicle cab, and internal measuring points for the vibration acceleration signal are arranged inside the ATM vehicle cab according to the direct contact points of the human body.

[0013] Optionally, the step of segmenting the standard vibration acceleration signal into at least one transient signal segment based on the vehicle state parameters specifically includes:

[0014] Based on the vehicle state parameters, the standard vibration acceleration signal is divided into the idle static shift transient signal segment, the Tip in / Tip out transient signal segment, the start transient signal segment, and the acceleration / deceleration shift transient signal segment.

[0015] Optionally, the step of calculating at least one dimension evaluation index for each transient signal segment and determining the comprehensive total weighted value of the current transient signal segment based on all the dimension evaluation indices specifically includes:

[0016] Calculate the vibration dose value, maximum instantaneous vibration value, peak value of acceleration change rate, standard deviation of acceleration change rate, impact duration and number of impacts for each transient signal segment to obtain the corresponding dimensional evaluation indicators;

[0017] The overall weighted value of the current transient signal segment is determined based on all the evaluation indicators mentioned above.

[0018] Optionally, the shift evaluation conditions include at least one of the following: idling condition, starting condition, acceleration condition, tip in / tip out condition, and deceleration condition;

[0019] The vehicle status parameters include at least one of the following: gear position, accelerator pedal opening, engine speed, and vehicle speed.

[0020] Secondly, the present invention also provides an automatic transmission shift quality evaluation device, comprising at least:

[0021] The working condition design module is used to design the shift evaluation working conditions for automatic transmission (AMT).

[0022] The signal acquisition module is used to acquire vehicle status parameters and vibration acceleration signals at a set frequency for each shift evaluation condition.

[0023] A standardization module is used to perform preprocessing operations on the vibration acceleration signal to obtain a standard vibration acceleration signal;

[0024] A signal segmentation module is used to segment the standard vibration acceleration signal into at least one transient signal segment based on the vehicle state parameters.

[0025] The comprehensive weighting module is used to calculate at least one dimension evaluation index for each transient signal segment and determine the comprehensive total weighting value of the current transient signal segment based on all the dimension evaluation indexes.

[0026] The quality evaluation module is used to complete the shift quality evaluation of the AMT based on the comprehensive total weighted value of all transient signal segments.

[0027] Optionally, it also includes:

[0028] The measuring point layout module is used to arrange external measuring points for the vibration acceleration signal outside the ATM vehicle cab and internal measuring points for the vibration acceleration signal inside the ATM vehicle cab according to the direct contact points of the human body.

[0029] Optionally, the signal splitting module is specifically used for:

[0030] Based on the vehicle state parameters, the standard vibration acceleration signal is divided into the idle static shift transient signal segment, the Tip in / Tip out transient signal segment, the start transient signal segment, and the acceleration / deceleration shift transient signal segment.

[0031] Thirdly, the present invention also provides an electronic device, including a memory and a processor, the memory storing a computer program executable on the processor, wherein the processor, when executing the program, implements the steps in the automatic transmission shift quality evaluation method according to any one of the first aspects.

[0032] Fourthly, the present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps in the automatic transmission shift quality evaluation method according to any one of the first aspects.

[0033] The technical solution provided by this invention firstly designs shift evaluation conditions for an automatic transmission (AMT); secondly, it collects vehicle state parameters and vibration acceleration signals at a set frequency for each shift evaluation condition; thirdly, it performs preprocessing on the vibration acceleration signals to obtain standard vibration acceleration signals; fourthly, it divides the standard vibration acceleration signals into at least one transient signal segment based on the vehicle state parameters; then, it calculates at least one dimension evaluation index for each transient signal segment and determines the comprehensive total weighted value of the current transient signal segment based on all dimension evaluation indices; finally, it completes the shift quality evaluation of the AMT based on the comprehensive total weighted value of all transient signal segments.

[0034] Therefore, this invention, on the one hand, performs preprocessing on the vibration acceleration signal to obtain a standard vibration acceleration signal, making the standard vibration acceleration signal simulate the frequency perception characteristics of the human body, thus matching the physical quantity with the subjective feeling of the human body and effectively improving the accuracy of subsequent shift quality evaluation. On the other hand, this invention calculates at least one dimension evaluation index for each transient signal segment and determines the comprehensive total weighted value evaluation index of the current transient signal segment based on all dimension evaluation indices to assess vibration intensity. This aims to more precisely characterize the dynamic characteristics of impact vibration under transient conditions, especially caused by sudden torque changes in the powertrain system, effectively standardizing AMT shift quality evaluation standards and ensuring the user's driving experience. Attached Figure Description

[0035] Figure 1 This is a flowchart of an automatic transmission shift quality evaluation method provided in an embodiment of the present invention;

[0036] Figure 2 This is a flowchart of another automatic transmission shift quality evaluation method provided in an embodiment of the present invention;

[0037] Figure 3 This is a flowchart of another automatic transmission shift quality evaluation method provided in an embodiment of the present invention;

[0038] Figure 4 This is a scatter plot showing the correlation between MTVV and subjective evaluation provided in an embodiment of the present invention;

[0039] Figure 5 This is a scatter plot showing the correlation between VDV and subjective evaluation provided in an embodiment of the present invention;

[0040] Figure 6 This is a Jerk provided in an embodiment of the present invention. peak Scatter plot of correlation between subjective evaluation and subjective evaluation;

[0041] Figure 7 This is a Jerk provided in an embodiment of the present invention. std Scatter plot of correlation between subjective evaluation and subjective evaluation;

[0042] Figure 8 This is a schematic diagram of the structure of an automatic transmission shift quality evaluation device provided in an embodiment of the present invention;

[0043] Figure 9 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The singular forms “a,” “said,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0046] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0047] It should be understood that although the terms first, second, third, etc., may be used in the embodiments of this application, these descriptions should not be limited to these terms. These terms are only used to distinguish the descriptions. For example, first may also be referred to as second without departing from the scope of the embodiments of this application, and similarly, second may also be referred to as first.

[0048] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0049] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0050] It should be noted that any symbols and / or numbers present in the specification that are not marked in the accompanying drawings are not reference numerals.

[0051] Figure 1 This is a flowchart of an automatic transmission shift quality evaluation method provided by an embodiment of the present invention. This embodiment is applicable to shift quality evaluation scenarios for at least various types of AMT vehicles. The automatic transmission shift quality evaluation method can be, but is not limited to, executed by the automatic transmission shift quality evaluation device in this embodiment of the present invention. This execution device can be implemented in software and / or hardware. Figure 1 As shown, the method for evaluating the shift quality of an automatic transmission includes at least the following steps:

[0052] S1. Design the shift evaluation conditions for an automatic manual transmission (AMT).

[0053] The shift evaluation condition can be understood as the vehicle's driving state. This embodiment designs a special test condition based on the characteristics of the powertrain system to induce specific vibration phenomena. In one specific implementation, the shift evaluation condition may optionally include at least one of the following: idling condition, starting condition, acceleration condition, tip-in / tip-out condition, and deceleration condition.

[0054] The idling condition can be the condition in which the gear is switched between PRND gears, and is used to evaluate the static shift vibration and impact.

[0055] The starting conditions can be assessed by having the vehicle idle at a flat surface and on a 10% standard incline, using 1st gear, 2nd gear...the highest starting gear and reverse gear, with the accelerator pedal at 25%, 50%, 75%, and 100% respectively. This is used to evaluate the smoothness of the starting process and the degree of clutch engagement jerking. Understandably, if the evaluation vehicle is equipped with an automatic start function, an evaluation of the smoothness of automatic start is also required.

[0056] The acceleration conditions correspond to the operation of the accelerator pedal at 25%, 50%, 75%, and 100% opening, respectively, starting from 1st gear / default gear and accelerating to the maximum vehicle speed at that accelerator pedal opening. This condition is used to evaluate whether there is a shift shock, jerking, or jerkiness when disengaging and engaging the clutch and selecting gears during acceleration.

[0057] Tip-in and tip-out are transient operating conditions, most likely to occur during normal driving. Tip-in refers to the driver quickly and deeply depressing the accelerator pedal when the vehicle is driving steadily (such as cruising or coasting). Tip-out refers to the driver quickly and completely releasing the accelerator pedal when the vehicle is in motion (such as accelerating or driving at a constant speed). Tip-in and tip-out cause drastic changes in engine output torque, and these rapid torque changes can cause vehicle surging and jerking. Therefore, it is necessary to perform tip-in and tip-out actions at different gears (1st gear to the highest gear) and different engine speeds (1000 rpm, 1200 rpm, 1400 rpm, 1600 rpm, 1800 rpm, 2000 rpm) to evaluate whether surging, jerking, or jerking occurs at different gears and engine speeds.

[0058] The deceleration condition can be the condition in which the vehicle accelerates to the highest gear on a flat road and then releases the accelerator to coast. Downshifting is performed under the following conditions: no braking, light braking (deceleration of 0.1g, where g represents gravitational acceleration), moderate braking (deceleration of 0.3g), and heavy braking (deceleration of 0.6g). This condition is used to evaluate whether there is a shift shock, jerking, or jerkiness when the vehicle downshifts.

[0059] S2. Collect vehicle status parameters and vibration acceleration signals at a set frequency for each gear shift evaluation condition.

[0060] The set frequency can be a sampling frequency of not less than 200Hz. To accurately capture the vibration transmission path of the powertrain system, the acquisition method can be to use a three-axis accelerometer to collect vibration acceleration signals along the X, Y, and Z axes in the vehicle coordinate system to comprehensively capture vibrations in all directions, especially longitudinal vibrations. In another specific implementation, optionally, the vehicle state parameters include at least one of the following: gear position, accelerator pedal opening, engine speed, and vehicle speed. It is known that the vehicle state parameters can be obtained via the CAN bus.

[0061] S3. Perform preprocessing operations on the vibration acceleration signal to obtain a standard vibration acceleration signal.

[0062] S4. Based on the vehicle state parameters, the standard vibration acceleration signal is divided into at least one transient signal segment.

[0063] It is understandable that step S4 can be interpreted as segmenting signal segments based on CAN bus signals (gear position, accelerator pedal opening, brake switch, etc.), dividing them into dynamic operating conditions where the vehicle's state changes significantly, such as the idle static shifting process, the tip-in and tip-out process at different gears / engine speeds, the starting process at different throttle openings / gears, and the acceleration / deceleration shifting process at different throttle openings. One process can correspond to one transient signal segment.

[0064] S5. Calculate at least one dimension evaluation index for each transient signal segment, and determine the comprehensive total weighted value of the current transient signal segment based on all dimension evaluation indices.

[0065] One of the evaluation indicators can correspond to a vehicle usage process, and the total weighted value can correspond to the complete vehicle usage process.

[0066] S6. Evaluate the shift quality of the AMT based on the total weighted value of all transient signal segments.

[0067] The technical solution provided in this embodiment firstly designs shift evaluation conditions for an automatic transmission (AMT); secondly, it collects vehicle state parameters and vibration acceleration signals at a set frequency for each shift evaluation condition; thirdly, it performs preprocessing on the vibration acceleration signals to obtain standard vibration acceleration signals; fourthly, it divides the standard vibration acceleration signals into at least one transient signal segment based on the vehicle state parameters; then, it calculates at least one dimension evaluation index for each transient signal segment and determines the comprehensive total weighted value of the current transient signal segment based on all dimension evaluation indices; finally, it completes the shift quality evaluation of the AMT based on the comprehensive total weighted value of all transient signal segments.

[0068] Therefore, this embodiment, on the one hand, performs preprocessing operations on the vibration acceleration signal to obtain a standard vibration acceleration signal, making the standard vibration acceleration signal simulate the frequency perception characteristics of the human body, matching the physical quantity with the subjective feeling of the human body, and effectively improving the accuracy of subsequent shift quality evaluation. On the other hand, this embodiment calculates at least one dimension evaluation index for each transient signal segment, and determines the comprehensive total weighted value evaluation index of the current transient signal segment based on all dimension evaluation indexes to evaluate vibration intensity. This aims to more precisely characterize the dynamic characteristics of impact vibration under transient conditions, especially caused by sudden torque changes in the power transmission system, which can effectively standardize the AMT shift quality evaluation standard and ensure the user's driving experience.

[0069] Based on the above embodiments or implementation methods Figure 2 This is a flowchart of another automatic transmission shift quality evaluation method provided in an embodiment of the present invention. Figure 3This is a flowchart of another automatic transmission shift quality evaluation method provided by an embodiment of the present invention. This embodiment is based on the above embodiment and includes additional steps. Figure 2 and Figure 3 As shown, the method for evaluating the shift quality of an automatic transmission includes at least the following steps:

[0070] S1. Design the shift evaluation conditions for an automatic manual transmission (AMT).

[0071] S7. Arrange external measuring points for vibration acceleration signals outside the ATM vehicle cab, and arrange internal measuring points for vibration acceleration signals inside the ATM vehicle cab according to the direct contact points with the human body.

[0072] External measuring points can be the engine housing, chassis, or cab mounting points. Internal measuring points are determined based on the direct contact points between the human body and the vehicle, and can be above the driver's seat cushion, the seat back, or the floor near the feet.

[0073] Understandably, the measurement points on the gearbox housing are used to directly measure the vibration of the gearbox body and assess the effects of gear meshing, etc.; the measurement points on the chassis are used to measure the structural vibration that forms the basis of the vehicle's vibration, analyze the impact of chassis rigidity on vibration transmission, and identify structural resonances caused by non-powertrain components; the measurement points on the cab suspension points are used to assess the effectiveness of vibration isolation components and the final vibration level transmitted to the cab; the measurement points above the driver's seat cushion are used to directly measure the vibration transmitted to the human body and assess ride comfort and the final vibration level perceived by the human body; the measurement points on the driver's seat back are used to measure the vibration at the back contact point, analyze the impact of the backrest on whole-body vibration, and assess vibration transmission in a specific direction; and the measurement points on the foot floor are used to measure the vibration transmitted directly to the driver's feet through the floor.

[0074] S2. Collect vehicle status parameters and vibration acceleration signals at a set frequency for each gear shift evaluation condition.

[0075] S3. Perform preprocessing operations on the vibration acceleration signal to obtain a standard vibration acceleration signal.

[0076] Preprocessing can involve filtering and frequency-weighting the vibration acceleration signals from human contact points such as seat cushions, seat backs, and footwells according to the GB / T 13441.1-2007 standard. It's understandable that, despite different excitation sources, vibration is ultimately perceived by the human body. Therefore, the vibration acceleration signals transmitted to human contact points such as seat rails, seat cushions, and seat backs can also be frequency-weighted filtered according to GB / T 13441.1-2007 to simulate the frequency perception characteristics of the human body, matching physical quantities with subjective human perception. For structural vibration points such as the gearbox housing, frame, and cab suspension, the goal is to diagnose the characteristics of the vibration source, analyze the vibration transmission path, and evaluate the effectiveness of vibration isolation components. What's needed is the physical vibration quantity, that is, to reflect the vibration intensity and frequency components of the structure itself as realistically as possible, without being distorted by human perception characteristics. Therefore, the vibration acceleration signals from structural vibration points such as the gearbox housing, frame, and cab suspension retain their original characteristics, i.e., unweighted vibration acceleration time histories are used to calculate vibration intensity and other indicators.

[0077] S41. Based on vehicle state parameters, the standard vibration acceleration signal is divided into the idle static shift transient signal segment, the Tip in / Tip out transient signal segment, the start transient signal segment, and the acceleration / deceleration shift transient signal segment.

[0078] For transient conditions where the vehicle's state changes significantly, such as starting, acceleration, tip-in / tip-out, and deceleration, the vibration intensity is evaluated using evaluation indicators such as maximum instantaneous vibration value (MTVV), vibration dose value (VDV), peak value of acceleration change rate, standard deviation of acceleration change rate, impact duration, and number of impacts. This aims to more precisely characterize the dynamic characteristics of impact vibrations under transient conditions, especially those caused by sudden torque changes in the power transmission system.

[0079] S51. Calculate the vibration dose value, maximum instantaneous vibration value, peak value of acceleration change rate, standard deviation of acceleration change rate, impact duration and number of impacts for each transient signal segment to obtain the corresponding dimensional evaluation indicators.

[0080] The vibration dose value can be obtained using the vibration dose method (VDV, unit). It was determined that the vibration dose method is more sensitive to peak values, and its calculation formula is as follows:

[0081] ;

[0082] In the formula, For weighted acceleration time history, the unit is . ; Action time (unit: Random shocks and transient vibrations are considered by using a short integral time constant.

[0083] Furthermore, the vibration amplitude is defined as the maximum instantaneous vibration value (MTVV, unit) ), is by Given the maximum value over time, The defining formula is:

[0084] ;

[0085] In the formula, Calculate acceleration for instantaneous frequency; The average integration time (default is 1 second). For time (integral variable); Let be the observation time (instantaneous time). The maximum instantaneous vibration value MTVV can then be determined by the following formula:

[0086] ;

[0087] In the formula, In a measurement cycle Inside The maximum value.

[0088] Peak rate of change of acceleration (Jerk) peak This can be a weighted acceleration signal. The absolute maximum value of the first derivative with respect to time is calculated using the following formula:

[0089] ;

[0090] Its physical meaning is the degree of drastic change in vibration acceleration, reflecting the rate of change of force / torque and the instantaneous sharpness of the impact. The unit is usually m / s³. The human body is very sensitive to the rate of change of acceleration; a high peak value of the rate of change of acceleration directly corresponds to the subjective feeling of impact and jerking. For example, in tip-in conditions, an extremely high peak value of the rate of change of acceleration often means that the throttle response is too sensitive and the power delivery is not smooth. In start-up conditions, if the engine torque and vehicle resistance torque are not well matched at the moment of clutch engagement, or if the clutch engagement speed is too fast, it will cause a sudden loading of vehicle power, producing an extremely high peak value of the rate of change of acceleration, corresponding to the subjective feeling of "lurching forward" or "jerkiness." In acceleration / deceleration upshifting / downshifting conditions, if the rate of change of torque during the torque increase and decrease phases is too fast, it will produce a large peak value of the rate of change of acceleration, corresponding to the subjective feeling of "shifting shock" or "shifting jerking."

[0091] Standard deviation of the rate of change of acceleration (Jerk) std (This refers to the time period for transient analysis) Inner Jerk peak The standard deviation of is calculated using the following formula:

[0092] ;

[0093] in, , During this period The average value, This is the weighted acceleration time history. This index calculates the rate of change of acceleration over the entire transient event analysis period. The magnitude of the fluctuations deviating from the average value, i.e., its dispersion, characterizes the process of establishing vibration stability. A smaller standard deviation means that after the shock, the vibration can quickly and smoothly converge to a new stable state; while a larger standard deviation indicates that during the transient process, the acceleration changes erratically, with continuous "surge" or "shaking," corresponding to "unsmoothness" in subjective evaluation.

[0094] Impact duration is used to quantify the total time from the start to the end of a single jitter / impact, and is calculated using the following formula:

[0095] ;

[0096] in, The moment of impact initiation is the moment when the acceleration signal first exceeds the threshold continuously. This is the moment when the acceleration signal last falls below the threshold and remains stable. If the impact duration is too long, it indicates insufficient system damping and slow vibration decay, giving the impression of "significant aftershocks"; if the duration is too short but the peak value is too high, it gives the impression of a "collision".

[0097] Furthermore, in a single transient condition (such as a gear shift or a tip-in), the vibration energy may not be in a single-peak form, but rather exhibit multiple rises and falls. The impact count is used to statistically analyze the number of significant vibration impact events occurring within the analysis period. An amplitude threshold and a minimum time interval threshold need to be set, and then the number of peak points exceeding the amplitude threshold is counted, with the time interval between adjacent peak points needing to be greater than the minimum time interval threshold.

[0098] S52. Determine the overall weighted value of the current transient signal segment based on all dimensions of evaluation indicators.

[0099] Understandably, in order to conduct correlation analysis between vibration evaluation indicators and corresponding subjective evaluation scores, it is necessary to calculate the total weighted MTVV value and VDV value at each measuring point. Value and The value is calculated using the following formula:

[0100] ;

[0101] In the formula, , , They are respectively Axial, Axial, Axial MTVV, VDV, Jerk peak and Jerk std Indicator value, These represent n measurement points, such as the area above the seat cushion and the driver's cab floor. The total weighted value is then calculated. Calculated by the following formula:

[0102] ;

[0103] S6. Evaluate the shift quality of the AMT based on the total weighted value of all transient signal segments.

[0104] In another specific implementation, to verify the effectiveness and practicality of the evaluation method constructed in this patent, this embodiment also includes a verification stage. The verification stage includes the following specific steps: the evaluation engineer subjectively scores each shift condition according to a 10-point scoring standard, calculates the comprehensive weighted value of each objective indicator, and establishes a correlation model between the objective indicators and the subjective scores:

[0105] During the verification phase, experienced evaluation engineers subjectively score the smoothness under each operating condition immediately after each test, using a unified scoring criterion. The average score from multiple tests is then taken as the subjective evaluation score for that operating condition, using a 10-point scoring system. Finally, a correlation analysis is performed on the vibration evaluation indicators and their corresponding subjective evaluation scores based on the calculation results. When the correlation between the objective indicators and the subjective scores is ≥80%, the automated evaluation of AMT shifting quality is completed.

[0106] More specifically, this embodiment selects a representative starting condition for case analysis. As a typical transient process of a vehicle transitioning from a static to a dynamic state, the starting condition comprehensively reflects the torque response of the powertrain system, the clutch engagement quality, and the overall vehicle inertial response, making it a key scenario for evaluating ride comfort.

[0107] During the test, three-dimensional vibration acceleration signals from the seat cushion and floor were simultaneously collected. Vehicle status parameters such as accelerator pedal opening, engine speed, vehicle speed, and transmission gear position were also recorded via the CAN bus. Experienced evaluation engineers subjectively scored the ride comfort under each condition immediately after each test, using a standardized scoring criterion. The average score from multiple tests was taken as the subjective evaluation score for that condition, using a 10-point scoring system. It should be noted that the verification analysis in this example primarily focuses on verifying whether the proposed objective indicators accurately reflect the final subjective experience of the driver and passengers. Therefore, data collection and analysis are concentrated on the points of direct human contact (seat and floor). Vibration measurement points on structures such as the transmission housing, frame, and cab mounting points are primarily used for vibration source identification and transmission path diagnosis, belonging to a deeper level of engineering problem analysis and optimization, and are not included in the verification scope of this example.

[0108] On a flat asphalt road surface, under full load, a test vehicle underwent start-up tests in both A and M modes: the AMT transmission was in 2nd gear, and the accelerator pedal opening was fixed at four typical operating conditions: 25%, 50%, 75%, and 100%. Each operating condition was repeated three times to ensure data repeatability and reliability. After preprocessing the collected raw signals, calculations were performed strictly according to the method. Table 1 is a subjective evaluation result table provided in this embodiment, and Tables 2-5 are objective evaluation result tables provided in this embodiment. As shown in Tables 1-5, with the increase of accelerator pedal opening (from 25% to 100%), MTVV, VDV, and Jerk... peak The three objective indicators generally showed an upward trend, while the corresponding subjective scores showed a downward trend. In addition, under full load conditions, when performing straight-line start-up operations with different throttle openings in second gear, the subjective feeling was that the vehicle exhibited obvious vibration in the Y direction. Objective test data showed that under this condition, the peak value of the vibration acceleration change rate in the Y direction was significantly higher than the vibration indicators in other directions, which preliminarily verified the consistency between the objective indicators and subjective feelings.

[0109] Table 1

[0110]

[0111] Table 2

[0112]

[0113] Table 3

[0114]

[0115] Table 4

[0116]

[0117] Table 5

[0118]

[0119] Furthermore, a correlation analysis was conducted on the vibration evaluation indicators and their corresponding subjective evaluation scores. First, the total weighted MTVV value, DVD value, and Jerk score at the seat and floor were calculated. peak Values ​​and Jerk std The value is calculated using the following formula:

[0120] ;

[0121] in, , , They are respectively Axial, Axial, Axial MTVV, DVD, Jerk peak and Jerk std Indicator value, These represent the two locations: above the seat cushion and on the driver's cab floor. The overall weighted value is then calculated. Calculated by the following formula

[0122] ;

[0123] Table 6 is a comprehensive weighted value table provided in the embodiments of the present invention, showing the final calculated comprehensive weighted MTVV value, DVD value, and Jerk value. peak Values ​​and Jerk std The values ​​can be shown in Table 6.

[0124] Table 6

[0125]

[0126] Furthermore, a correlation analysis was conducted on the vibration evaluation indicators and their corresponding subjective evaluation scores based on the calculation results. Figure 4 This is a scatter plot showing the correlation between MTVV and subjective evaluation provided in an embodiment of the present invention. Figure 5 This is a scatter plot showing the correlation between VDV and subjective evaluation provided in an embodiment of the present invention. Figure 6 This is a Jerk provided in an embodiment of the present invention. peak Scatter plot of correlation with subjective evaluation Figure 7 This is a Jerk provided in an embodiment of the present invention. std A scatter plot showing the correlation between subjective evaluation and... (e.g.) Figure 4-7 As shown, the correlation between MTVV and subjective evaluation is 79.9%, the correlation between VDV and subjective evaluation is 82.5%, and the correlation between Jerk... peak The correlation between the indicators and subjective evaluations was 96.4%, and Jerk...std The correlation between the indicators and subjective evaluations was 88.8%. Among them, Jerk... peak It has the highest correlation with subjective scores, which also indicates that the objective evaluation index proposed in this patent is accurate and effective.

[0127] In summary, this embodiment deploys three-dimensional acceleration sensors at key locations such as the seat cushion, floor, backrest, gearbox housing, frame, and cab suspension to collect vibration acceleration signals under core AMT shifting performance evaluation conditions, including idling, starting, acceleration, and braking. Frequency-weighted filtering is applied to signals from human contact points, while preserving the original characteristics of signals from structural vibration points. Objective evaluation indicators such as vibration dose value (VDV), maximum instantaneous vibration value (MTVV), peak acceleration rate of change, standard deviation of acceleration rate of change, impact duration, and number of impacts are calculated to construct a multi-dimensional evaluation indicator system. Finally, the objective indicators are correlated with subjective scores to achieve automated and precise evaluation of AMT shifting quality, providing data support for AMT shifting performance optimization.

[0128] Figure 8 This is a schematic diagram of an automatic transmission shift quality evaluation device provided in an embodiment of the present invention. This embodiment is applicable to shift quality evaluation scenarios for at least various types of AMT vehicles. The automatic transmission shift quality evaluation device can be implemented using software and / or hardware. Figure 8 As shown, the automatic transmission shift quality evaluation device includes at least:

[0129] The working condition design module 110 is used to design the shift evaluation working conditions of an automatic transmission (AMT).

[0130] The signal acquisition module 120 is used to acquire vehicle status parameters and vibration acceleration signals at a set frequency for each gear shift evaluation condition.

[0131] The standardization module 130 is used to perform preprocessing operations on the vibration acceleration signal to obtain a standard vibration acceleration signal.

[0132] The signal segmentation module 140 is used to segment a standard vibration acceleration signal into at least one transient signal segment based on vehicle state parameters.

[0133] The comprehensive weighting module 150 is used to calculate at least one dimension evaluation index for each transient signal segment and determine the comprehensive total weighting value of the current transient signal segment based on all dimension evaluation indexes.

[0134] The quality evaluation module 160 is used to complete the shift quality evaluation of the AMT based on the total weighted value of all transient signal segments.

[0135] Optionally, it also includes:

[0136] The measuring point layout module 170 is used to arrange external measuring points for vibration acceleration signals outside the ATM vehicle cab and internal measuring points for vibration acceleration signals inside the ATM vehicle cab according to the direct contact points of the human body.

[0137] Optionally, the signal splitting module is specifically used for:

[0138] Based on vehicle state parameters, the standard vibration acceleration signal is divided into the idle static shift transient signal segment, the Tipin / Tip out transient signal segment, the start-up transient signal segment, and the acceleration / deceleration shift transient signal segment.

[0139] Optionally, the comprehensive weighting module 150 is specifically used for:

[0140] The vibration dose value, maximum instantaneous vibration value, peak value of acceleration change rate, standard deviation of acceleration change rate, impact duration and number of impacts for each transient signal segment are calculated to obtain the corresponding dimensional evaluation indicators; and the comprehensive total weighted value of the current transient signal segment is determined based on all dimensional evaluation indicators.

[0141] Optionally, the shift evaluation conditions include at least one of the following: idling condition, starting condition, acceleration condition, tip in / tip out condition, and deceleration condition;

[0142] Vehicle status parameters include at least one of the following: gear position, accelerator pedal opening, engine speed, and vehicle speed.

[0143] The technical solution provided in this embodiment firstly designs the shift evaluation conditions of an automatic transmission (AMT) through a working condition design module; further, it acquires vehicle state parameters and vibration acceleration signals at a set frequency for each shift evaluation condition through a signal acquisition module; further, it performs preprocessing operations on the vibration acceleration signals through a standardization module to obtain standard vibration acceleration signals; further, it segments the standard vibration acceleration signals into at least one transient signal segment based on the vehicle state parameters through a signal segmentation module; further, it calculates at least one dimension evaluation index for each transient signal segment through a comprehensive weighting module, and determines the comprehensive total weighting value of the current transient signal segment based on all dimension evaluation indices; finally, it completes the shift quality evaluation of the AMT through a quality evaluation module based on the comprehensive total weighting value of all transient signal segments.

[0144] Therefore, this embodiment, on the one hand, performs preprocessing operations on the vibration acceleration signal to obtain a standard vibration acceleration signal, making the standard vibration acceleration signal simulate the frequency perception characteristics of the human body, matching the physical quantity with the subjective feeling of the human body, and effectively improving the accuracy of subsequent shift quality evaluation. On the other hand, this embodiment calculates at least one dimension evaluation index for each transient signal segment, and determines the comprehensive total weighted value evaluation index of the current transient signal segment based on all dimension evaluation indexes to evaluate vibration intensity. This aims to more precisely characterize the dynamic characteristics of impact vibration under transient conditions, especially caused by sudden torque changes in the power transmission system, which can effectively standardize the AMT shift quality evaluation standard and ensure the user's driving experience.

[0145] This embodiment provides an electronic device. Figure 9 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. See also: Figure 9 The electronic device 1000 includes a processor 1001 and a memory 1002. The memory 1002 stores computer-readable instructions. When the computer-readable instructions are executed by the processor 1001, the steps in any of the above automatic transmission shift quality evaluation methods are performed. Through the above technical solution, the processor 1001 and the memory 1002 are interconnected and communicate with each other through a communication bus and / or other forms of connection mechanism (not shown). The memory 1002 stores a computer program that can be executed by the processor. When the electronic device 1000 is running, the processor 1001 executes the computer program to execute the automatic transmission shift quality evaluation method in any optional implementation of the above embodiments, so as to achieve at least the following functions: designing the shift evaluation conditions of the automatic transmission AMT; collecting vehicle state parameters and vibration acceleration signals of each shift evaluation condition at a set frequency; performing preprocessing operations on the vibration acceleration signals to obtain standard vibration acceleration signals; dividing the standard vibration acceleration signals into at least one transient signal segment based on the vehicle state parameters; calculating at least one dimension evaluation index for each transient signal segment, and determining the comprehensive total weighted value of the current transient signal segment based on all dimension evaluation indexes; and completing the shift quality evaluation of the AMT based on the comprehensive total weighted value of all transient signal segments.

[0146] This embodiment provides a computer-readable storage medium storing a computer program. When executed by a processor, the program implements the automatic transmission shift quality evaluation method provided in all embodiments of this application: designing shift evaluation conditions for an automatic transmission (AMT); collecting vehicle state parameters and vibration acceleration signals at a set frequency for each shift evaluation condition; performing preprocessing operations on the vibration acceleration signals to obtain standard vibration acceleration signals; dividing the standard vibration acceleration signals into at least one transient signal segment based on the vehicle state parameters; calculating at least one dimension evaluation index for each transient signal segment and determining the comprehensive total weighted value of the current transient signal segment based on all dimension evaluation indices; and completing the shift quality evaluation of the AMT based on the comprehensive total weighted value of all transient signal segments.

[0147] Any combination of one or more computer-readable media may be used. A computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium can be, for example—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.

[0148] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including—but not limited to—electromagnetic signals, optical signals, or any suitable combination thereof. Computer-readable signal media may also be any computer-readable medium other than computer-readable storage media, capable of transmitting, propagating, or transmitting programs for use by or in connection with an instruction execution system, apparatus, or device.

[0149] The program code contained on a computer-readable medium may be transmitted using any suitable medium, including—but not limited to—wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0150] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof. Programming languages ​​include object-oriented programming languages—such as Java, Smalltalk, and C++—as well as conventional procedural programming languages—such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0151] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for evaluating the shift quality of an automatic transmission, characterized in that, At least including: Design shift evaluation conditions for automatic manual transmission (AMT); Collect vehicle status parameters and vibration acceleration signals at a set frequency for each of the aforementioned shift evaluation conditions; Perform preprocessing on the vibration acceleration signal to obtain a standard vibration acceleration signal; Based on the vehicle state parameters, the standard vibration acceleration signal is divided into at least one transient signal segment; Calculate at least one dimension evaluation index for each transient signal segment, and determine the overall weighted value of the current transient signal segment based on all the dimension evaluation indices; The shift quality evaluation of the AMT is completed based on the comprehensive weighted value of all transient signal segments.

2. The method for evaluating the shift quality of an automatic transmission according to claim 1, characterized in that, Before collecting the vehicle state parameters and the vibration acceleration signal at a set frequency for each shift evaluation condition, the method further includes: External measuring points for the vibration acceleration signal are arranged outside the ATM vehicle cab, and internal measuring points for the vibration acceleration signal are arranged inside the ATM vehicle cab according to the direct contact points of the human body.

3. The method for evaluating the shift quality of an automatic transmission according to claim 1, characterized in that, The step of dividing the standard vibration acceleration signal into at least one transient signal segment based on the vehicle state parameters specifically includes: Based on the vehicle state parameters, the standard vibration acceleration signal is divided into the idle static shift transient signal segment, the Tip in / Tip out transient signal segment, the start transient signal segment, and the acceleration / deceleration shift transient signal segment.

4. The method for evaluating the shift quality of an automatic transmission according to claim 1, characterized in that, The calculation of at least one dimension evaluation index for each transient signal segment and the determination of the comprehensive total weighted value of the current transient signal segment based on all the dimension evaluation indices specifically include: Calculate the vibration dose value, maximum instantaneous vibration value, peak value of acceleration change rate, standard deviation of acceleration change rate, impact duration and number of impacts for each transient signal segment to obtain the corresponding dimensional evaluation indicators; The overall weighted value of the current transient signal segment is determined based on all the evaluation indicators mentioned above.

5. The method for evaluating the shift quality of an automatic transmission according to claim 1, characterized in that, The shift evaluation conditions include at least one of the following: idling condition, starting condition, acceleration condition, tip in / tip out condition, and deceleration condition; The vehicle status parameters include at least one of the following: gear position, accelerator pedal opening, engine speed, and vehicle speed.

6. An automatic transmission shift quality evaluation device, characterized in that, At least including: The working condition design module is used to design the shift evaluation working conditions for automatic transmission (AMT). The signal acquisition module is used to acquire vehicle status parameters and vibration acceleration signals at a set frequency for each shift evaluation condition. A standardization module is used to perform preprocessing operations on the vibration acceleration signal to obtain a standard vibration acceleration signal; A signal segmentation module is used to segment the standard vibration acceleration signal into at least one transient signal segment based on the vehicle state parameters. The comprehensive weighting module is used to calculate at least one dimension evaluation index for each transient signal segment and determine the comprehensive total weighting value of the current transient signal segment based on all the dimension evaluation indexes. The quality evaluation module is used to complete the shift quality evaluation of the AMT based on the comprehensive total weighted value of all transient signal segments.

7. The automatic transmission shift quality evaluation device according to claim 6, characterized in that, Also includes: The measuring point layout module is used to arrange external measuring points for the vibration acceleration signal outside the ATM vehicle cab and internal measuring points for the vibration acceleration signal inside the ATM vehicle cab according to the direct contact points of the human body.

8. The automatic transmission shift quality evaluation device according to claim 6, characterized in that, The signal segmentation module is specifically used for: Based on the vehicle state parameters, the standard vibration acceleration signal is divided into the idle static shift transient signal segment, the Tip in / Tip out transient signal segment, the start transient signal segment, and the acceleration / deceleration shift transient signal segment.

9. An electronic device comprising a memory and a processor, the memory storing a computer program executable on the processor, characterized in that, When the processor executes the program, it implements the steps in the automatic transmission shift quality evaluation method according to any one of claims 1 to 5.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps in the automatic transmission shift quality evaluation method according to any one of claims 1 to 5.

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