Electric vehicle transmission rapid shift control method and system

Abstract

This invention belongs to the field of intelligent control technology for new energy-driven vehicles, specifically relating to a method and system for rapid gear shifting control of electric vehicle transmissions. The method includes: acquiring raw speed data of the drive motor and output shaft, as well as the accelerator pedal opening; obtaining filtered speed data using a discretized first-order lag filtering algorithm, and calculating the speed deviation and the rate of change of deviation; constructing a synchronization state index based on the speed deviation and the rate of change of deviation to characterize the generalized distance between the system state and the ideal static synchronization point; calculating an allowable judgment threshold based on the accelerator pedal opening; and making a gear engagement triggering decision based on the inequality relationship between the synchronization state index, the rate of change of deviation, and the allowable judgment threshold. This invention can effectively suppress high-frequency noise interference, solve the gear grinding problem under high dynamic conditions, and achieve an adaptive balance between shifting comfort and power performance, as well as precise gear engagement timing control.

Description

Technical Field

[0001] This invention relates to the field of intelligent control technology for new energy-powered vehicles. More specifically, this invention relates to a method and system for rapid gear shifting control of electric vehicle transmissions. Background Technology

[0002] With the continuous evolution of power transmission technology for new energy vehicles, in order to balance the high efficiency range of the drive motor under different operating conditions and improve the overall power performance of the vehicle, the application of multi-speed mechanical automatic transmissions in electric vehicle powertrains is becoming increasingly widespread. During gear shifting operations while the vehicle is in motion, the speed synchronization control between the drive motor and the transmission output shaft is the core factor determining the shifting quality. The ideal synchronization process requires that the linear velocities of the engagement sleeve and the target gear ring be kept consistent at the moment of contact to eliminate the inertial impact caused by the speed difference, thereby ensuring the smoothness of the shifting process and extending the service life of mechanical components.

[0003] Existing shift synchronization control strategies typically employ a threshold-based method based on static speed difference. Specifically, the controller monitors the drive motor's speed and the output shaft speed (calculated using the speed ratio) in real time, calculating the absolute difference between them. When this speed difference is less than a preset fixed constant, the control system determines that synchronization is complete and sends a gear engagement command to the shift motor. This method can achieve relatively reliable gear engagement under steady-state vehicle driving or slow speed changes.

[0004] However, in actual vehicle operation, especially under high dynamic conditions such as rapid acceleration, rapid deceleration, or severe fluctuations in road load, the above-mentioned determination method based on static speed difference reveals obvious limitations: Since there is an objective physical action delay of tens to hundreds of milliseconds from the time the shift motor receives the electrical signal command to the time when the shift fork pushes the engagement sleeve to actually contact the gear ring, in the transient process with a very high rate of speed change, even if the speed difference at the time of determination meets the threshold requirement, the speed drift caused by high acceleration is ignored by the system. During the time delay of the shift motor action, the speed difference between the drive motor and the output shaft will quickly widen again. This phenomenon of "determination expires" results in a large relative speed between the engagement sleeve and the gear ring when they actually contact each other, which causes serious gear grinding noise and mechanical impact. Long-term accumulation can lead to synchronizer damage or even gearbox failure. Summary of the Invention

[0005] To address the technical problem in the prior art that neglects the physical delay of the shifting motor, leading to the failure of shifting synchronization determination under high dynamic conditions, and consequently causing gear grinding and mechanical impact, the present invention provides solutions in the following aspects.

[0006] In a first aspect, the present invention provides a method for rapid gear shifting control of an electric vehicle transmission, comprising: acquiring raw speed data of a drive motor and an output shaft and performing filtering processing; calculating a speed deviation and a deviation change rate based on the filtered drive motor speed and the filtered output shaft speed; constructing a synchronization state index based on the speed deviation and the deviation change rate, wherein the synchronization state index characterizes the generalized distance of the system state from the ideal static synchronization point; acquiring the accelerator pedal opening degree and dynamically calculating an allowable judgment threshold based on the accelerator pedal opening degree; performing a predictive triggering decision based on the synchronization state index, the deviation change rate, the allowable judgment threshold, and the inherent physical delay time of the gear shifting motor; and outputting a drive command to control the gear shifting motor to perform a gear engagement action when a preset triggering condition is met.

[0007] This invention collects raw speed data of the drive motor and output shaft, as well as accelerator pedal opening, and processes the raw speed data using a discretized first-order hysteresis filtering algorithm. This effectively filters out high-frequency electromagnetic noise while preserving the effective dynamic characteristics of the signal, avoiding noise amplification caused by direct differential calculation, and providing a clean and accurate data foundation for subsequent calculations. By constructing a synchronization state index that includes positional dimension deviation energy and velocity dimension kinetic energy deviation based on speed deviation and deviation change rate, this invention can comprehensively evaluate the synchronization energy state of the system, avoiding the limitation of a single index failing to identify high dynamic risks. By calculating the current permissible judgment threshold based on accelerator pedal opening and combining it with preset inequality relationships for decision-making, this invention achieves an adaptive balance between shifting comfort and power performance, as well as precise gear engagement timing control.

[0008] Preferably, the step of collecting and filtering the raw speed data of the drive motor and output shaft includes: obtaining the filtered drive motor speed in the current control cycle, the value of which is equal to the sum of the product of the filtering weighting coefficient and the raw drive motor speed collected in the current control cycle, plus 1 minus the filtering weighting coefficient, and the product of the filtered drive motor speed in the previous control cycle; obtaining the filtered output shaft speed in the current control cycle, the value of which is equal to the sum of the product of the filtering weighting coefficient and the raw output shaft speed collected in the current control cycle, plus 1 minus the filtering weighting coefficient, and the product of the filtered output shaft speed in the previous control cycle.

[0009] This invention obtains the filtered drive motor speed and the filtered output shaft speed by using an iterative calculation method based on weighted coefficients. By using a weighted sum of historical filtered values ​​and the current original values, a balance is achieved between suppressing high-frequency interference signals generated by high-voltage electrical environments and maintaining the real-time tracking performance of the signal. This operation prevents the signal lag caused by over-filtering from affecting the dynamic response capability of the control system, while also avoiding numerical jitter caused by insufficient filtering, thereby ensuring the accuracy and smoothness of the speed data used to calculate the deviation.

[0010] Preferably, the calculation of speed deviation and deviation change rate based on the filtered drive motor speed and the filtered output shaft speed includes: subtracting the product of the filtered output shaft speed and the speed ratio constant of the current target gear from the filtered drive motor speed of the current control cycle to obtain the speed deviation of the current control cycle; subtracting the difference between the speed deviation of the previous control cycle and the speed deviation of the current control cycle from the speed deviation of the current control cycle, and dividing by the duration of the control cycle to obtain the deviation change rate of the current control cycle.

[0011] By calculating the difference between the filtered drive motor speed and the converted output shaft speed, the speed deviation is obtained. Furthermore, the rate of change of the deviation is calculated by taking the derivative of the speed deviation with respect to time. This invention not only obtains the positional speed difference between the drive motor and the output shaft but also quantifies the relative acceleration between the input and output ends. This operation provides multi-dimensional evidence for a comprehensive evaluation of the system's synchronization energy state, enabling the system to perceive the dynamic trend of speed synchronization, rather than just the current static difference, thus providing necessary state variables for precise control.

[0012] Preferably, the step of constructing the synchronization state index based on the rotational speed deviation and the rate of change of the deviation includes: In the formula, Indicates the current control cycle The synchronization state index; Indicates the current control cycle The speed deviation; This represents the acceleration weighting coefficient; This indicates the physical cycle of the shift motor; Indicates the current control cycle The rate of change of deviation.

[0013] This invention constructs a synchronization state index that integrates the square term of the speed deviation and the square term of the deviation change rate, extending the evaluation of the synchronization state from a one-dimensional line segment to a two-dimensional phase plane. This index can characterize the generalized distance between the system state and the ideal static synchronization point. This operation enables the system to effectively identify dangerous operating conditions with small speed deviations but extremely large deviation change rates, thereby avoiding mechanical shocks and gear grinding caused by shifting gears under such high dynamic energy conditions. This significantly improves the safety of the shifting process and the robustness of the system.

[0014] Preferably, the allowable threshold increases non-linearly with the increase of the accelerator pedal opening.

[0015] Preferably, the allowable judgment threshold satisfies the expression: In the formula, Indicates the current control cycle The permissible threshold for judgment; Indicates the baseline safety threshold; Represents the natural logarithm function; Indicates a radical regulatory factor; Indicates the current control cycle The accelerator pedal opening.

[0016] This invention calculates the permissible judgment threshold using the natural logarithmic function relationship, so that the threshold increases gradually with the increase of the accelerator pedal opening. This operation utilizes the characteristics of the logarithmic function, which ensures that the threshold is appropriately relaxed under high power demand to reduce power interruption time, while avoiding the threshold from increasing too quickly and causing the judgment to be too lenient and causing shock. Thus, it achieves precise matching of different driving intentions and controllable adjustment of the threshold, and prevents the threshold from getting out of control.

[0017] Preferably, predictive triggering decisions are made based on the synchronization state index, the deviation change rate, the permissible judgment threshold, and the inherent physical delay time of the shift motor, including: In the formula, Indicates the current control cycle The synchronization state index; Indicates the current control cycle The rate of change of deviation; This indicates the inherent physical delay time of the shift motor; Represents a symbolic function; Indicates the current control cycle The speed deviation; Indicates the current control cycle The permissible threshold for judgment.

[0018] This invention quantifies the potential drift of the system state within the physical delay time by using the product of the current deviation rate and the inherent physical delay time as a predictor and incorporating it into the determination of the synchronization state. This operation uses the current dynamic trend to extrapolate the state at the time of action execution, ensuring that the control decision is made based on the estimated state at the actual engagement moment, rather than based on the lagging current state. This effectively avoids gear collisions caused by system response lag and achieves precise, shock-free gear shifting.

[0019] Preferably, the sign function is used to characterize the directional attribute of the speed deviation: when the speed deviation... When the value is greater than zero, the sign function takes the value of 1; when the speed deviation... When the value is less than zero, the sign function takes the value of -1; when the speed deviation is zero, the sign function takes the value of 0.

[0020] Preferably, the value range of the filter weighting coefficient is from 0.10 to 0.25.

[0021] In a second aspect, the present invention provides a fast shift control system for an electric vehicle transmission, including a processor and a memory, wherein the memory stores computer program instructions, and when the computer program instructions are executed by the processor, the above-described fast shift control method for an electric vehicle transmission is implemented.

[0022] By adopting the above technical solution, the above-mentioned electric vehicle gearbox rapid shift control method is generated into a computer program and stored in a memory for loading and execution by a processor. A terminal device is then created based on the memory and processor for convenient use.

[0023] The beneficial effects of this invention are as follows: This invention identifies transient driving conditions by constructing a two-dimensional evaluation index and combines driving intention and hardware delay for prediction and compensation, effectively preventing gear grinding under high relative acceleration, while taking into account both shift smoothness and power response. Attached Figure Description

[0024] Figure 1 This is a flowchart illustrating the rapid gear shifting control method for an electric vehicle transmission in this invention; Figure 2 This is a schematic diagram illustrating the dynamic changes of physical variables during the gear shifting synchronization process; Figure 3 This is a schematic diagram illustrating the shift triggering logic of the traditional static threshold method; Figure 4 This is a schematic diagram illustrating the shift triggering logic based on the phase plane dynamic stability domain of the present invention. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0027] This invention discloses a method for controlling rapid gear shifting in an electric vehicle transmission, referring to... Figure 1 This includes steps S1-S4: S1. Collect the original speed data of the drive motor and output shaft, and calculate the speed deviation and the rate of change of deviation.

[0028] It should be noted that the high-voltage electrical environment of electric vehicles generates significant electromagnetic interference, causing high-frequency noise to be mixed into the raw speed signal acquired by the sensors. Directly performing differential calculations on the noisy signal would greatly amplify the noise amplitude, leading to distortion or even unusable calculations of the subsequent deviation rate of change, thus misleading the control strategy. Therefore, this invention first introduces a discretized first-order hysteresis filtering process to filter out high-frequency interference while preserving the effective dynamic characteristics of the signal, providing a clean data foundation for subsequent accurate calculations.

[0029] Specifically, the present invention collects the original speed of the drive motor, the original speed of the output shaft, and the accelerator pedal opening in each control cycle, and obtains the filtered drive motor speed and the filtered output shaft speed based on a discretized first-order hysteresis filtering algorithm.

[0030] The filtered drive motor speed and the filtered output shaft speed satisfy the following expression:

[0031]

[0032] In the formula, Indicates the current control cycle The filtered drive motor speed; Indicates the current control cycle The original rotational speed of the drive motor was collected; Indicates the filter weighting coefficients; Indicates the previous control cycle The filtered drive motor speed; Indicates the current control cycle The output shaft speed after filtering; Indicates the current control cycle The original rotational speed of the output shaft is collected; Indicates the previous control cycle The output shaft speed after filtering.

[0033] It should be further noted that the filter weighting coefficient in this invention is set to a value range of 0.10 to 0.25. The filter weighting coefficient determines the cutoff frequency and signal hysteresis. If the filter weighting coefficient is too small, the weight of historical values ​​is too large. Although the high-frequency noise suppression effect is enhanced, the signal hysteresis will increase significantly, resulting in a sluggish response of the control system. If the filter weighting coefficient is too large, the signal tracking performance is enhanced, but the noise suppression capability decreases, resulting in jitter in subsequent calculations. In this embodiment, the filter weighting coefficient is set to 0.15 to balance noise suppression and signal real-time performance. In other embodiments, implementers can set the filter weighting coefficient according to the actual situation.

[0034] Furthermore, the present invention calculates the speed deviation and the rate of change of deviation based on the filtered drive motor speed and the filtered output shaft speed.

[0035] The rotational speed deviation and the rate of change of deviation satisfy the following expression:

[0036]

[0037] In the formula, Indicates the current control cycle The speed deviation; This represents the gear ratio constant for the current target gear. Indicates the current control cycle The rate of change of deviation; Indicates the duration of the control cycle.

[0038] In the formula, the speed deviation It reflects the speed difference between the drive motor and the converted output shaft, directly indicating the degree of synchronization; deviation change rate It is the derivative of the speed deviation with respect to time, which physically corresponds to the relative acceleration between the input and output terminals; the larger the value of the deviation change rate, the faster the speed deviation changes, and the system is in a highly dynamic change process.

[0039] For example, Figure 2 This diagram illustrates the dynamic changes of physical variables during the gear shifting synchronization process. It shows the dynamic characteristics of key physical variables changing over time during the gear shifting synchronization process. The solid curve representing the speed deviation drops rapidly from its initial high position and crosses the zero axis at a certain moment. At the same time, the dashed curve representing the relative acceleration shows a large amplitude at the moment the speed deviation crosses the zero axis, indicating that the system is in a transient crossing state with high kinetic energy difference. Subsequently, both curves gradually converge to near the zero axis, indicating that the system has entered a stable synchronization state with both speed deviation and relative acceleration being extremely small.

[0040] S2. Construct a synchronization state index that integrates rotational speed deviation and deviation change rate.

[0041] It should be noted that existing technologies typically rely solely on one-dimensional speed deviation for judgment, failing to identify transient crossing conditions where the speed deviation is zero but the rate of change of deviation is extremely high. Under such conditions, if gear shifting is performed, the engagement sleeve and gear ring will violently impact due to the enormous relative kinetic energy, leading to severe mechanical shock and gear breakage. Therefore, this invention constructs a two-dimensional evaluation index that integrates speed deviation and the rate of change of deviation, extending state assessment from a one-dimensional line segment to a two-dimensional phase plane, thereby comprehensively measuring the synchronous energy state of the system.

[0042] Specifically, the present invention constructs a synchronization state index that includes rotational speed deviation and deviation change rate, which is used to characterize the generalized distance between the system state and the ideal static synchronization point.

[0043] The synchronization state exponent satisfies the expression:

[0044] In the formula, Indicates the current control cycle The synchronization state index; Indicates the current control cycle The speed deviation; This represents the acceleration weighting coefficient; This represents the physical cycle of the shift motor, which is 0.1 seconds in this embodiment; Indicates the current control cycle The rate of change of deviation.

[0045] Acceleration weighting coefficient The value is used to adjust the system's sensitivity to the rate of change of deviation, and ranges from 0.8 to 1.5. The larger the value, the stronger the system's ability to suppress high acceleration conditions. In this embodiment, the acceleration weight coefficient is set to 1.0 to balance the anti-gear-scratching effect and shifting efficiency. In other embodiments, the implementer can set the acceleration weight coefficient according to the actual situation.

[0046] In the formula, the first term The second term represents the bias energy in the position dimension. It characterizes the kinetic energy deviation in the velocity dimension.

[0047] S3. Dynamically calculate the allowable judgment threshold based on the accelerator pedal opening.

[0048] It should be noted that different driving scenarios have inherently contradictory requirements for shift quality; low-speed following requires extreme smoothness to prevent jerking, while rapid acceleration requires rapid power response and allows for slight impacts; a fixed threshold will result in jerking at low speeds or sluggish power response at high speeds. Therefore, this invention dynamically adjusts the threshold for allowing gear shifting based on the driver's power demand, achieving an adaptive balance between comfort and power.

[0049] Specifically, the present invention calculates the current permissible threshold based on the accelerator pedal opening.

[0050] The allowable threshold satisfies the expression:

[0051] In the formula, Indicates the current control cycle The permissible threshold for judgment; The reference safety threshold is a physical limit value determined through bench testing, and in this embodiment it is set to 20 revolutions per minute. Represents the natural logarithm function; Indicates a radical regulatory factor; Indicates the current control cycle The accelerator pedal opening.

[0052] radical regulators The sensitivity of the threshold to changes in pedal opening is determined, with a value ranging from 0.5 to 2.0; in this embodiment, it is set to 1.0; in other embodiments, implementers can set an aggressive adjustment factor according to the actual situation.

[0053] In this formula, the expression utilizes the properties of the natural logarithm function to make the permissible judgment threshold increase nonlinearly with the increase of the accelerator pedal opening. When the accelerator pedal opening is small, the permissible judgment threshold is close to the baseline safety threshold to ensure smooth shifting. When the accelerator pedal opening is large, the permissible judgment threshold is appropriately relaxed, but the growth rate gradually slows down to avoid threshold runaway.

[0054] S4. Decision-making based on prediction and compensation mechanism for gear shifting.

[0055] It should be noted that there is a fixed physical delay between the shift motor receiving the command and the shift fork actually contacting the synchronizer gear ring. If the judgment is based solely on the current state, the system state often drifts by the time the action is completed, leading to missing the optimal synchronization point or causing a collision. Therefore, this invention introduces a predictive compensation mechanism for the physical delay, using the current rate of change of deviation to extrapolate the future state, ensuring that the execution time precisely coincides with the optimal synchronization time.

[0056] Specifically, the present invention determines whether the synchronization state index, the deviation change rate, and the allowable judgment threshold satisfy a preset inequality relationship. If they are satisfied, a drive command is output to control the shift motor to perform a gear engagement action.

[0057] The pre-defined inequality relationship satisfies the expression:

[0058] In the formula, Indicates the current control cycle The synchronization state index; Indicates the current control cycle The rate of change of deviation; This represents the inherent physical delay time of the shift motor, used to predict actual communication and mechanical delays. In this embodiment, the inherent physical delay time... The time delay is set to 0.15 seconds. In other embodiments, implementers can set the inherent physical delay time according to the actual situation. Represents a symbolic function; Indicates the current control cycle The speed deviation; Indicates the current control cycle The permissible threshold for judgment.

[0059] Among them, the sign function Used to characterize the directional attribute of speed deviation; specifically, when the speed deviation When the value is greater than zero, it means that the drive motor speed is higher than the converted output shaft speed, and the sign function takes the value of 1; when the speed deviation is greater than zero, it means that the drive motor speed is higher than the converted output shaft speed. When the value is less than zero, it means that the speed of the drive motor is lower than the converted output shaft speed, and the sign function takes the value of -1; when the speed deviation is zero, the sign function takes the value of 0.

[0060] In the decision logic, this sign function is mainly used to determine the convergence of the system state and apply predictive compensation accordingly: when the deviation rate changes... With speed deviation When the signs are opposite (i.e., opposite), it indicates that the current speed difference is decreasing and the system is in the automatic convergence process toward the synchronization point. At this time, the product of the deviation change rate, physical delay time, and sign function is negative. This negative value, as a compensation term, reduces the total value on the left side of the judgment inequality, allowing the system to meet the judgment condition in advance when the synchronization state index is slightly higher than the allowable judgment threshold, thereby triggering the gear shifting command. The inherent physical delay time of the mechanism action is used to offset the remaining speed deviation, achieving precise coincidence between the action arrival time and the optimal synchronization time. Conversely, when the two signs are the same, it indicates that the error is diverging, and the compensation term is positive, thereby delaying the trigger to avoid shifting shock caused by state deterioration.

[0061] In the formula, the intermediate term Quantified the inherent physical delay time Internal state drift prediction; sign function Used to indicate the direction of deviation; when the system is in a convergent trend, that is, the deviation change rate and the speed deviation have different signs, the prediction term is negative, which reduces the value on the left side of the inequality, so that the judgment condition is met in advance before the synchronization state index is completely lower than the allowable judgment threshold, and zero-wait gear engagement is achieved; when the system is in a divergent trend, the prediction term is positive, and the trigger is delayed to avoid risks.

[0062] For example, Figure 3 This diagram illustrates the shift triggering logic of the traditional static threshold method, showcasing the control logic and limitations of existing technologies based on static speed difference thresholds. The diagram shows a dotted curve representing the absolute value of the speed deviation, which decreases rapidly over time. When the curve value falls below the horizontal dashed line representing a fixed preset threshold, the system determines that the synchronization condition is met and triggers the shift command. Figure 2 It can be seen that at the triggering moment, although the speed deviation meets the threshold requirement, the system is still in a state of extremely high relative acceleration. This indicates that the traditional method misjudges the highly dynamic transient crossing point as the synchronization point, thus leading to the risk of gear breakage.

[0063] For example, Figure 4 This is a schematic diagram of the shift triggering logic based on the dynamic stability domain of the phase plane according to the present invention. It illustrates the triggering logic and effect of the control method proposed in this invention: the solid curve representing the synchronization state index in the figure still maintains a high amplitude during the stage when the speed deviation transiently crosses the zero axis. This is because the index incorporates the relative acceleration term, thereby effectively suppressing false triggering under high acceleration conditions. The system only triggers the shift command when the synchronization state index curve drops below the dotted-dash curve representing the dynamic allowable judgment threshold. This triggering moment corresponds to the region where both the speed deviation and relative acceleration have converged, verifying that the present invention can accurately lock the safe and stable optimal synchronization point.

[0064] This invention also discloses a fast shift control system for an electric vehicle transmission, including a processor and a memory. The memory stores computer program instructions, and when the computer program instructions are executed by the processor, the fast shift control method for an electric vehicle transmission according to this invention is implemented.

[0065] The system also includes other components well known to those skilled in the art, such as communication buses and communication interfaces, the settings and functions of which are known in the art and will not be described in detail here.

Claims

1. A method for controlling rapid gear shifting in an electric vehicle transmission, characterized in that, include: The raw speed data of the drive motor and output shaft are collected and filtered, including: The filtered drive motor speed of the current control cycle is obtained. Its value is equal to the product of the filter weighting coefficient and the original drive motor speed collected in the current control cycle, plus the product of the difference obtained by subtracting the filter weighting coefficient from 1 and the filtered drive motor speed of the previous control cycle. The output shaft speed after filtering in the current control cycle is obtained. Its value is equal to the sum of the product of the filtering weighting coefficient and the original output shaft speed collected in the current control cycle, plus the product of the difference obtained by subtracting the filtering weighting coefficient from 1 and the output shaft speed after filtering in the previous control cycle. The speed deviation and the rate of change of deviation are calculated based on the filtered drive motor speed and the filtered output shaft speed, including: The speed deviation of the current control cycle is obtained by subtracting the product of the output shaft speed of the current control cycle and the speed ratio constant of the current target gear from the filtered drive motor speed of the current control cycle; the speed deviation of the current control cycle is subtracted from the speed deviation of the previous control cycle, and then divided by the duration of the control cycle to obtain the deviation change rate of the current control cycle. A synchronization state index is constructed based on the speed deviation and the rate of change of the deviation. The synchronization state index characterizes the generalized distance between the system state and the ideal static synchronization point. Obtain the accelerator pedal opening and dynamically calculate the allowable judgment threshold based on the accelerator pedal opening; Based on the synchronization state index, the deviation change rate, the allowable judgment threshold, and the inherent physical delay time of the shift motor, a predictive triggering decision is made. When the preset triggering conditions are met, a drive command is output to control the shift motor to perform a shifting action.

2. The method for rapid gear shifting control of an electric vehicle transmission according to claim 1, characterized in that, The construction of the synchronization state index based on the speed deviation and the rate of change of the deviation includes: ； In the formula, Indicates the current control cycle The synchronization state index; Indicates the current control cycle The speed deviation; This represents the acceleration weighting coefficient; This indicates the physical cycle of the shift motor; Indicates the current control cycle The rate of change of deviation.

3. The method for rapid gear shifting control of an electric vehicle transmission according to claim 1, characterized in that, The permissible threshold increases non-linearly with the increase of the accelerator pedal opening.

4. The method for rapid gear shifting control of an electric vehicle transmission according to claim 3, characterized in that, The allowable threshold satisfies the expression: ； In the formula, Indicates the current control cycle The permissible threshold for judgment; Indicates the baseline safety threshold; Represents the natural logarithm function; Indicates a radical regulatory factor; Indicates the current control cycle The accelerator pedal opening.

5. The method for rapid gear shifting control of an electric vehicle transmission according to claim 1, characterized in that, Predictive triggering decisions are made based on the synchronization state index, the deviation change rate, the permissible judgment threshold, and the inherent physical delay time of the shift motor, including: ； In the formula, Indicates the current control cycle The synchronization state index; Indicates the current control cycle The rate of change of deviation; This indicates the inherent physical delay time of the shift motor; Represents a symbolic function; Indicates the current control cycle The speed deviation; Indicates the current control cycle The permissible threshold for judgment.

6. The method for rapid gear shifting control of an electric vehicle transmission according to claim 5, characterized in that, The sign function is used to characterize the directional attribute of the speed deviation: when the speed deviation... When the value is greater than zero, the sign function takes the value of 1; when the speed deviation... When the value is less than zero, the sign function takes the value of -1; when the speed deviation is zero, the sign function takes the value of 0.

7. The method for rapid gear shifting control of an electric vehicle transmission according to claim 1, characterized in that, The value range of the filter weighting coefficient is 0.10 to 0.

25.

8. A fast shift control system for an electric vehicle transmission, characterized in that, include: A processor and a memory, wherein the memory stores computer program instructions that, when executed by the processor, implement the electric vehicle transmission rapid shift control method according to any one of claims 1-7.

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