Vehicle drivability evaluation method and system, electronic equipment and storage medium

Abstract

The embodiment of the invention provides a vehicle drivability evaluation method and system, electronic equipment and a storage medium, and belongs to the technical field of automobile engineering. The method comprises the steps that when it is determined that a vehicle is in a constant acceleration working condition, a vehicle longitudinal acceleration disturbance scoring index, a high-frequency disturbance frequency and amplitude proportion scoring index, a longitudinal acceleration gradient scoring index, an expected acceleration scoring index, an accelerator map matching degree scoring index and a low-frequency resonance scoring index are calculated; based on the vehicle longitudinal acceleration disturbance scoring index, the high-frequency disturbance frequency and amplitude proportion scoring index, the longitudinal acceleration gradient scoring index, the expected acceleration scoring index, the accelerator map matching degree scoring index and the low-frequency resonance scoring index, calculation is conducted according to preset weights, and a drivability evaluation score is obtained. By combining multi-dimensional and quantitative evaluation indexes, accurate evaluation of the acceleration performance of the AMT heavy truck is realized, the evaluation consistency and efficiency are improved, and the evaluation cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of automobile engineering technology, and in particular to a vehicle driving performance evaluation method, system, electronic equipment and storage medium. Background Art

[0002] At present, the evaluation of driving performance of heavy-duty vehicles faces severe challenges. On the one hand, the evaluation process is highly dependent on the subjective feelings of the assessors and lacks a unified and objective evaluation standard, which not only greatly reduces the consistency and reliability of the evaluation results, but also significantly increases the cost and complexity of the evaluation. On the other hand, the software resources for heavy-duty vehicle driving performance evaluation on the market are scarce, and the existing software has obvious deficiencies. For example, the evaluation indicators fail to comprehensively and scientifically cover all aspects of driving performance, especially ignoring those subtle differences that are crucial to the driving experience; at the same time, the robustness of these systems needs to be improved. Slight changes in the external environment may cause significant fluctuations in the evaluation results, thereby reducing the accuracy and reliability of the evaluation.

[0003] Therefore, building a scientific, comprehensive, objective and highly robust heavy-duty vehicle driving performance evaluation system has become an important issue that needs to be solved urgently. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a vehicle driving performance evaluation method, system, electronic device and storage medium, which are used to fully or at least partially solve the technical problems existing in the above-mentioned prior art.

[0005] In order to achieve the above object, an embodiment of the present invention provides a method for evaluating the driving performance of a vehicle, comprising: When the vehicle is determined to be in a constant acceleration condition, the vehicle longitudinal acceleration disturbance score index, the frequency and amplitude ratio score index of high-frequency disturbance, the longitudinal acceleration gradient score index, the expected acceleration score index, the throttle map matching score index and the low-frequency resonance score index are calculated respectively; The driving performance evaluation score is obtained by calculating the vehicle longitudinal acceleration disturbance score index, the frequency and amplitude ratio score index of high-frequency disturbance, the longitudinal acceleration gradient score index, the expected acceleration score index, the throttle map matching score index and the low-frequency resonance score index according to the preset weights.

[0006] Optionally, the process of determining whether the vehicle is in a constant acceleration condition includes: Based on the acceleration condition determination condition, it is determined whether the vehicle is in the acceleration condition. If the vehicle meets the acceleration condition determination condition, it means that the vehicle is in the acceleration condition; wherein the acceleration condition determination condition is characterized by the accelerator pedal position being greater than zero, the accelerator pedal position change rate being less than a calibrated rated value, the vehicle acceleration being greater than zero, and the current gear position of the transmission being greater than zero; If the vehicle is in an acceleration condition, it is determined whether the vehicle is in a constant throttle acceleration condition based on the constant throttle acceleration condition determination condition. If the vehicle meets the constant throttle acceleration condition determination condition, it means that the vehicle is in a constant acceleration condition; wherein, the constant throttle acceleration condition determination condition is characterized by the pedal being at a constant level and not exceeding the full load throttle position and the transmission gear position remaining unchanged for a preset time.

[0007] Optionally, the calculation process of the vehicle longitudinal acceleration disturbance scoring index and the longitudinal acceleration gradient scoring index includes: Calculate the average acceleration of the vehicle in the entire acceleration interval, and filter out the maximum and minimum acceleration values ​​in the interval; Determine a peak value that deviates from the average value of acceleration, and use the peak value as the vehicle longitudinal acceleration disturbance value, wherein the larger the vehicle longitudinal acceleration disturbance value is, the lower the vehicle longitudinal acceleration disturbance score index is; The longitudinal acceleration gradient is determined based on the difference between the maximum value and the minimum value of the acceleration in the interval, wherein the larger the longitudinal acceleration gradient is, the lower the longitudinal acceleration gradient score index of the vehicle is.

[0008] Optionally, calculate the expected acceleration curve under the current throttle according to the following formula:

[0009]

[0010] In the formula, m represents the vehicle mass, represents the resistance parameter, θ represents the road slope, represents the total ratio of the transmission speed ratio multiplied by the differential speed ratio, η represents the DPI efficiency, r represents the dynamic wheel radius, n represents the engine speed, It represents the maximum engine speed, v represents the vehicle speed, k(n) represents the coefficient related to the engine speed, simulating the influence of the moment of inertia, and the coefficient α represents the influence coefficient of the moment of inertia.

[0011] Optionally, the throttle map match evaluates the deviation between the actual acceleration and the ideal acceleration at the current throttle position, and calculates the expected acceleration value at a certain throttle position according to the following formula:

[0012] In the formula, m represents the vehicle mass, r represents the tire radius, i represents the total transmission ratio, Indicates the accelerator pedal position percentage, Indicates the rated torque at the current engine speed.

[0013] Optionally, the root mean square value of the acceleration signal in the low frequency band is calculated according to the following formula to characterize the low frequency resonance score index:

[0014] In the formula, N represents the total number of elements in the data set. It represents the square of the i-th acceleration signal in the low-frequency band data set. The higher the RMS value, the greater the overall fluctuation of the vehicle's acceleration in the low-frequency range, and the lower the low-frequency resonance score.

[0015] Optionally, the driving performance evaluation score is calculated according to the following formula:

[0016] In the formula, , , , , , They represent the weight coefficients of the vehicle longitudinal acceleration disturbance score index, the frequency and amplitude ratio score index of high-frequency disturbance, the longitudinal acceleration gradient score index, the expected acceleration score index, the throttle map matching score index, and the low-frequency resonance score index for comprehensive drivability evaluation. Indicates the vehicle longitudinal acceleration disturbance score index, Indicates the frequency and amplitude ratio of high-frequency disturbances. Represents the longitudinal acceleration gradient scoring index, represents the expected acceleration score index, Indicates the throttle map matching score index, Represents the low-frequency resonance scoring indicator.

[0017] On the other hand, the present invention also provides a vehicle driving performance evaluation system, comprising: A calculation unit, used to determine when the vehicle is in a constant acceleration condition, and respectively calculate the vehicle longitudinal acceleration disturbance score index, the frequency and amplitude ratio score index of the high-frequency disturbance, the longitudinal acceleration gradient score index, the expected acceleration score index, the throttle map matching score index and the low-frequency resonance score index; The evaluation unit is used to calculate the driving performance evaluation score based on the vehicle longitudinal acceleration disturbance scoring index, the frequency and amplitude proportion scoring index of high-frequency disturbance, the longitudinal acceleration gradient scoring index, the expected acceleration scoring index, the throttle map matching scoring index and the low-frequency resonance scoring index according to preset weights.

[0018] On the other hand, the present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned vehicle driving performance evaluation method when executing the program.

[0019] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the vehicle driving performance evaluation method described above are implemented.

[0020] Through the above technical solution, combined with multi-dimensional and quantitative evaluation indicators, an objective and accurate evaluation of the acceleration performance of AMT heavy-duty vehicles can be achieved, the consistency and efficiency of the evaluation can be improved, and the evaluation cost can be reduced.

[0021] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings: Figure 1 is an implementation flow chart of a vehicle driving performance evaluation method provided by an embodiment of the present invention; Figure 2 is a detailed implementation flow chart of a vehicle driving performance evaluation method provided by an embodiment of the present invention; Figure 3 It is a structural schematic diagram of a vehicle driving performance evaluation system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0024] See also Figure 1 As shown, it is a flowchart of an implementation method of a vehicle driving performance evaluation method provided by an embodiment of the present invention, including the following execution steps: Step 100: When it is determined that the vehicle is in a constant acceleration condition, the vehicle longitudinal acceleration disturbance score index, the frequency and amplitude ratio score index of the high-frequency disturbance, the longitudinal acceleration gradient score index, the expected acceleration score index, the throttle map matching score index and the low-frequency resonance score index are calculated respectively.

[0025] In some embodiments, the process of determining whether a vehicle is in a constant acceleration condition includes: based on an acceleration condition determination condition, determining whether the vehicle is in an acceleration condition, if the vehicle satisfies the acceleration condition determination condition, it indicates that the vehicle is in an acceleration condition; wherein, the acceleration condition determination condition is characterized by an accelerator pedal position greater than zero, an accelerator pedal position change rate less than a calibrated rated value, a vehicle acceleration greater than zero, and a current gear position of the transmission greater than zero; if the vehicle is in an acceleration condition, determining whether the vehicle is in a constant throttle acceleration condition based on a constant throttle acceleration condition determination condition, if the vehicle satisfies the constant throttle acceleration condition determination condition, it indicates that the vehicle is in a constant acceleration condition; wherein, the constant throttle acceleration condition determination condition is characterized by the pedal being at a constant level and not exceeding the full load throttle position and the transmission gear position remaining unchanged for a preset time.

[0026] In some embodiments, the acceleration condition determination conditions: the throttle pedal position is greater than 0, the throttle pedal position change rate is less than the calibrated rated value, the vehicle acceleration is greater than 0, and the current gear position of the transmission is greater than 0; Detailed definition and exit conditions of the constant throttle acceleration condition: Determination conditions: the pedal is at a constant level for 0-5 seconds and does not exceed the full load throttle position, and the gearbox gear remains unchanged for the same time as above. Exit conditions: the throttle pedal position changes by more than 5%, the transmission shifts, or the engine speed reaches 95% of the rated speed.

[0027] The acceleration conditions are divided into four conditions according to the throttle action, and the boundary conditions of the constant throttle acceleration condition are clearly defined.

[0028] In some embodiments, the calculation process of the vehicle longitudinal acceleration disturbance score index and the longitudinal acceleration gradient score index includes the following steps: S1: Calculate the average acceleration of the vehicle in the entire acceleration interval, and filter out the maximum and minimum acceleration values ​​in the interval.

[0029] S2: Determine a peak value that deviates from the average value of acceleration, and use the peak value as a vehicle longitudinal acceleration disturbance value, wherein a larger vehicle longitudinal acceleration disturbance value is, a lower vehicle longitudinal acceleration disturbance score index is.

[0030] S3: Determine the longitudinal acceleration gradient based on the difference between the maximum value and the minimum value of the acceleration in the interval, wherein the larger the longitudinal acceleration gradient is, the lower the longitudinal acceleration gradient score index of the vehicle is.

[0031] In some embodiments, the longitudinal acceleration disturbance refers to the degree to which the acceleration value fluctuates around its mean value during the actual acceleration process, which reflects the smoothness of the vehicle acceleration. Calculate the average acceleration value of the entire acceleration interval ( ), find the maximum value of acceleration in this interval ( ) and minimum value ( ), but usually more attention is paid to fluctuations that are larger than the mean to reflect the acceleration impact of the vehicle, so peaks and valleys that deviate greatly from the mean are considered. ,in is each value in the acceleration sequence. The larger the longitudinal acceleration disturbance, the lower the score. When in a larger throttle position, the longitudinal acceleration disturbance is positively corrected.

[0032]

[0033] Where: b is the throttle opening (%), n is the throttle 1 voltage signal change gradient.

[0034] In some embodiments, to further refine the evaluation, the frequency and amplitude ratio of high-frequency disturbances are further calculated, and the frequency of each disturbance from one peak to the next same peak, or from trough to trough is calculated, and the ratio of the intervals with amplitudes greater than d% of the mean in the intervals with frequencies greater than cHz is calculated. Since high amplitudes represent vibrations and bumps, the ratio ( x ), the larger the value, the lower the score.

[0035]

[0036]

[0037]

[0038]

[0039] Where: f is the disturbance frequency, T is the period, c is given by the measurement personnel, the larger the c is, the higher the tolerance to vibration is, the value range is: 2~50, the default is c=10; d is given by the measurement personnel, the larger the d is, the higher the tolerance to uncomfortable bumps is, the value range is: 0~100%, the default is d=50%; i is the interval where the disturbance frequency is greater than 10Hz, z is the interval where the amplitude is 50% larger than the mean, for z Interval time Total time greater than 10Hz percentage.

[0040] In some embodiments, the longitudinal acceleration gradient refers to the significant difference in acceleration change during acceleration, which reflects the linearity of acceleration change and the dynamic response capability of the vehicle. Find the maximum value of acceleration in this interval ( ) and minimum value ( ), The larger the longitudinal acceleration gradient is, the worse the acceleration linearity is, and the lower the score is.

[0041] Not only is the maximum value of the acceleration disturbance calculated, but frequency analysis is also introduced, especially the proportion of high-frequency disturbances and the frequency of fluctuations whose amplitude exceeds the set threshold, to comprehensively evaluate the acceleration smoothness.

[0042] In some embodiments, the expected acceleration is a theoretical acceleration value calculated based on the vehicle dynamics model and the current throttle position, which is used to compare with the actual acceleration to evaluate the response performance of the power system. For constant throttle position acceleration, the expected acceleration curve under the current throttle is calculated according to the formula based on vehicle parameters such as vehicle mass, drag coefficient, road slope, total speed ratio, efficiency, wheel radius, engine moment of inertia, etc.: ; ; In the formula, m represents the vehicle mass, represents the resistance parameter, θ represents the road slope, represents the total ratio of the transmission speed ratio multiplied by the differential speed ratio, η represents the DPI efficiency, r represents the dynamic wheel radius, n represents the engine speed, Indicates the maximum engine speed, v indicates the vehicle speed, k(n) indicates the coefficient related to the engine speed, simulating the influence of the moment of inertia. The coefficient α represents the influence of the moment of inertia. The larger the value, the greater the influence. It is given by the measurement personnel, α value ≤ 1, the default α = 0.8, the lower the average acceleration level is relative to the expected average acceleration level, the lower the score. When the throttle position is small and the trigger time is short, the expected acceleration is negatively corrected.

[0043] Establish an expected acceleration calculation model that is dynamically adjusted based on the vehicle's real-time status (such as mass, drag coefficient, road slope, etc.) to improve the accuracy and adaptability of the evaluation.

[0044] In some embodiments, the throttle map matching degree: evaluates the deviation between the actual acceleration and the ideal acceleration at the current throttle position, reflecting the degree of optimization of the throttle response curve. The expected acceleration value at a certain throttle is calculated according to the formula, and the positive / negative deviation between the ideal acceleration and the actual acceleration corresponding to the current vehicle speed at a certain throttle.

[0045]

[0046] In the formula, m represents the vehicle mass, r represents the tire radius, i represents the total transmission ratio, Indicates the accelerator pedal position percentage, Indicates the rated torque at the current engine speed.

[0047] The better the consistency between the ideal acceleration and the actual acceleration, the higher the score. When the throttle position is too large, resulting in the actual acceleration being greater than the ideal acceleration, or the throttle position is too small, the ideal acceleration is corrected to fit the actual acceleration curve as closely as possible.

[0048] A real-time feedback system is designed to dynamically correct the throttle map according to the deviation between the throttle position and the actual acceleration, ensuring the continuous matching of the evaluation model with the actual vehicle performance.

[0049] In some embodiments, low-frequency resonance refers to the acceleration fluctuation phenomenon of the vehicle in the low frequency band (such as 2Hz-10Hz) during acceleration, which may affect driving comfort and stability. The acceleration signal is filtered to extract the components in the 2Hz-10Hz frequency band. The root mean square value (RMS) of the acceleration signal in this frequency band is calculated:

[0050] In the formula, N represents the total number of elements in the data set. Represents the square of each value in the low-frequency band data set. The higher the RMS value, the greater the overall fluctuation of the vehicle's acceleration in the low-frequency range, and the lower the low-frequency resonance score.

[0051] Step 101: Based on the vehicle longitudinal acceleration disturbance scoring index, the frequency and amplitude ratio scoring index of high-frequency disturbance, the longitudinal acceleration gradient scoring index, the expected acceleration scoring index, the throttle map matching scoring index and the low-frequency resonance scoring index, the driving performance evaluation score is obtained by calculating according to the preset weights.

[0052] In some implementations, calculations are performed based on the six evaluation indicators according to pre-set weights to ultimately obtain a drivability evaluation score.

[0053] Scoring mechanism: Based on the quantitative results of each evaluation index, a comprehensive score is given according to the preset weights to obtain the total score of the driving performance evaluation. The scoring formula is:

[0054] In the formula, , , , , , They represent the weight coefficients of the vehicle longitudinal acceleration disturbance score index, the frequency and amplitude ratio score index of high-frequency disturbance, the longitudinal acceleration gradient score index, the expected acceleration score index, the throttle map matching score index, and the low-frequency resonance score index for comprehensive drivability evaluation. Indicates the vehicle longitudinal acceleration disturbance score index, Indicates the frequency and amplitude ratio of high-frequency disturbances. Represents the longitudinal acceleration gradient scoring index, represents the expected acceleration score index, Indicates the throttle map matching score index, Represents the low-frequency resonance scoring indicator.

[0055] By integrating multiple sources of information such as vehicle sensor data (such as acceleration, speed, and throttle position), GPS data, and user feedback, a more comprehensive and objective drivability evaluation model can be constructed.

[0056] In some embodiments, see Figure 2 As shown, it is a detailed implementation flow chart of a vehicle driving performance evaluation method provided by an embodiment of the present invention, including: determining the vehicle driving condition, judging whether the vehicle acceleration is greater than 0, whether the throttle pedal position is greater than 0, whether the throttle pedal position change rate is less than the calibrated rated value, and whether the current gear position of the transmission is greater than 0, if so, determining that the vehicle is in an acceleration condition, continuing to judge whether the pedal is at a constant level for more than 1 second and does not exceed the full-load throttle position, and whether the gear position of the transmission remains unchanged for more than 1 second, if so, determining that the vehicle is in a constant acceleration condition, and calculating the longitudinal acceleration disturbance score, the longitudinal acceleration gradient score, the expected acceleration score, the throttle map matching score and the low-frequency resonance score, and respectively calculating the longitudinal acceleration disturbance calculation weight, the longitudinal acceleration gradient calculation weight, the expected acceleration calculation weight, the throttle map matching calculation weight and the low-frequency resonance calculation weight, and determining the constant acceleration condition comprehensive score based on the above weight values.

[0057] Through the above technical solution, combined with multi-dimensional and quantitative evaluation indicators, an objective and accurate evaluation of the acceleration performance of AMT heavy-duty vehicles can be achieved, the consistency and efficiency of the evaluation can be improved, and the evaluation cost can be reduced.

[0058] See also Figure 3 FIG. 1 is a schematic diagram of a vehicle driving performance evaluation system provided by an embodiment of the present invention, comprising: The calculation unit 30 is used to determine that when the vehicle is in a constant acceleration condition, calculate the vehicle longitudinal acceleration disturbance scoring index, the frequency and amplitude ratio scoring index of the high-frequency disturbance, the longitudinal acceleration gradient scoring index, the expected acceleration scoring index, the throttle map matching scoring index and the low-frequency resonance scoring index respectively; The evaluation unit 31 is used to calculate the driving performance evaluation score based on the vehicle longitudinal acceleration disturbance scoring index, the frequency and amplitude proportion scoring index of the high-frequency disturbance, the longitudinal acceleration gradient scoring index, the expected acceleration scoring index, the throttle map matching scoring index and the low-frequency resonance scoring index according to preset weights.

[0059] On the other hand, the present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned vehicle driving performance evaluation method when executing the program.

[0060] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the vehicle driving performance evaluation method described above are implemented.

[0061] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0062] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0063] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0064] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0065] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0066] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0067] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0068] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0069] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A method for evaluating the driving performance of a vehicle, characterized in that: include: When the vehicle is determined to be in a constant acceleration condition, the vehicle longitudinal acceleration disturbance score index, the frequency and amplitude ratio score index of high-frequency disturbance, the longitudinal acceleration gradient score index, the expected acceleration score index, the throttle map matching score index and the low-frequency resonance score index are calculated respectively; The driving performance evaluation score is obtained by calculating the vehicle longitudinal acceleration disturbance score index, the frequency and amplitude ratio score index of high-frequency disturbance, the longitudinal acceleration gradient score index, the expected acceleration score index, the throttle map matching score index and the low-frequency resonance score index according to the preset weights.

2. The vehicle driving performance evaluation method according to claim 1, characterized in that: The process of determining whether the vehicle is in a constant acceleration condition includes: Based on the acceleration condition determination condition, it is determined whether the vehicle is in the acceleration condition. If the vehicle meets the acceleration condition determination condition, it means that the vehicle is in the acceleration condition; wherein the acceleration condition determination condition is characterized by the accelerator pedal position being greater than zero, the accelerator pedal position change rate being less than a calibrated rated value, the vehicle acceleration being greater than zero, and the current gear position of the transmission being greater than zero; If the vehicle is in an acceleration condition, it is determined whether the vehicle is in a constant throttle acceleration condition based on the constant throttle acceleration condition determination condition. If the vehicle meets the constant throttle acceleration condition determination condition, it means that the vehicle is in a constant acceleration condition; wherein, the constant throttle acceleration condition determination condition is characterized by the pedal being at a constant level and not exceeding the full load throttle position and the transmission gear position remaining unchanged for a preset time.

3. The vehicle driving performance evaluation method according to claim 1, characterized in that: The calculation process of the vehicle longitudinal acceleration disturbance score index and the longitudinal acceleration gradient score index includes: Calculate the average acceleration of the vehicle in the entire acceleration interval, and filter out the maximum and minimum acceleration values ​​in the interval; Determine a peak value that deviates from the average value of acceleration, and use the peak value as the vehicle longitudinal acceleration disturbance value, wherein the larger the vehicle longitudinal acceleration disturbance value is, the lower the vehicle longitudinal acceleration disturbance score index is; The longitudinal acceleration gradient is determined based on the difference between the maximum value and the minimum value of the acceleration in the interval, wherein the larger the longitudinal acceleration gradient is, the lower the longitudinal acceleration gradient score index of the vehicle is.

4. The vehicle driving performance evaluation method according to claim 1, characterized in that: Calculate the expected acceleration at the current throttle using the following formula: ； ； In the formula, m represents the vehicle mass, represents the resistance parameter, θ represents the road slope, represents the total ratio of the transmission speed ratio multiplied by the differential speed ratio, η represents the DPI efficiency, r represents the dynamic wheel radius, n represents the engine speed, It represents the maximum engine speed, v represents the vehicle speed, k(n) represents the coefficient related to the engine speed, simulating the influence of the moment of inertia, and the coefficient α represents the influence coefficient of the moment of inertia.

5. The vehicle driving performance evaluation method according to claim 1, characterized in that: The throttle map matching evaluates the deviation between the actual acceleration and the ideal acceleration at the current throttle position, and calculates the expected acceleration value at a certain throttle according to the following formula: ； In the formula, m represents the vehicle mass, r represents the tire radius, i represents the total transmission ratio, Indicates the accelerator pedal position percentage, Indicates the rated torque at the current engine speed.

6. The vehicle driving performance evaluation method according to claim 1, characterized in that: The root mean square value of the acceleration signal in the low frequency band is calculated according to the following formula to characterize the low frequency resonance score index: ； In the formula, N represents the total number of elements in the data set. It represents the square of the i-th acceleration signal in the low-frequency band data set. The higher the RMS value, the greater the overall fluctuation of the vehicle's acceleration in the low-frequency range, and the lower the low-frequency resonance score.

7. The vehicle driving performance evaluation method according to claim 1, characterized in that: The driving performance evaluation score is calculated according to the following formula: ； In the formula, , , , , , They represent the weight coefficients of the vehicle longitudinal acceleration disturbance score index, the frequency and amplitude ratio score index of high-frequency disturbance, the longitudinal acceleration gradient score index, the expected acceleration score index, the throttle map matching score index, and the low-frequency resonance score index for comprehensive drivability evaluation. Indicates the vehicle longitudinal acceleration disturbance score index, Indicates the frequency and amplitude ratio of high-frequency disturbances. Represents the longitudinal acceleration gradient scoring index, represents the expected acceleration score index, Indicates the throttle map matching score index, Represents the low-frequency resonance scoring indicator.

8. A vehicle driving performance evaluation system, characterized in that: include: A calculation unit, used to determine when the vehicle is in a constant acceleration condition, and respectively calculate the vehicle longitudinal acceleration disturbance score index, the frequency and amplitude ratio score index of the high-frequency disturbance, the longitudinal acceleration gradient score index, the expected acceleration score index, the throttle map matching score index and the low-frequency resonance score index; The evaluation unit is used to calculate the driving performance evaluation score based on the vehicle longitudinal acceleration disturbance scoring index, the frequency and amplitude proportion scoring index of high-frequency disturbance, the longitudinal acceleration gradient scoring index, the expected acceleration scoring index, the throttle map matching scoring index and the low-frequency resonance scoring index according to preset weights.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the vehicle driving performance evaluation method according to any one of claims 1 to 7 are implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the vehicle driving performance evaluation method according to any one of claims 1 to 7 are implemented.

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