Power transmission control method and system, terminal and medium

Abstract

The invention belongs to the technical field of vehicle power control, and particularly discloses a power transmission control method and system, a terminal and a medium. Comprising the following steps: acquiring operating parameters, performing standardization processing on the parameters, performing weighted calculation according to a preset weight, and generating a comprehensive judgment value capable of representing a vehicle power state switching demand; respectively determining a power connection threshold value and a power disconnection threshold value based on the comprehensive judgment value, and executing power disconnection control when the comprehensive judgment value meets a disconnection condition or a specific vehicle working condition meets a disconnection requirement; the power engagement control is executed when the integrated determination value satisfies an engagement condition or the vehicle is in an operation mode in which an increase in driving force is required. By introducing a double-threshold structure of the connection judgment value and the disconnection judgment value, the power switching time is more accurate, frequent switching can be reduced, and the reliability of power response is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vehicle power control, and particularly relates to a power transmission control method, system, terminal and medium. BACKGROUND

[0002] In a vehicle transmission system, the transmission of power between a driving motor, a speed change mechanism, a differential mechanism and a wheel usually needs to be realized through a controllable engagement mechanism. In a hybrid vehicle, an electric drive axle and an electric four-wheel drive system, a mechanical or electrically controlled clutch structure is often used to realize power path switching, front-rear axle driving mode switching or energy recovery mode switching, so as to complete the conversion of the power transmission path through engagement or disengagement.

[0003] In the prior art, the control mode of power engagement / disengagement mainly depends on preset working condition thresholds. However, the working conditions of a vehicle are complex and changeable, and the power demand of a driver has obvious individual differences. It is difficult for a fixed threshold to take into account different scenarios and different driving habits, which often leads to the following problems: Inaccurate determination of power switching timing. Traditional algorithms are often based on a single parameter or simple logical judgment, and the coupling relationship between different parameters is not fully considered, which may result in late power engagement, early disengagement or frequent switching, affecting the power response and ride comfort of the vehicle.

[0004] Inability to adaptively optimize according to driver feedback. In actual use of a vehicle, a driver may manually intervene in the system due to power response lag, excessive switching frequency or unsatisfactory engagement time. However, the traditional control system does not have the ability to automatically adjust the engagement logic based on the driver's reverse operation behavior, and cannot realize a control strategy that continuously optimizes over time. SUMMARY

[0005] The application provides a power transmission control method, system, terminal and medium to solve the problem of inaccurate determination of power switching timing in the background art, which affects the power response and ride comfort of the vehicle. At the same time, the problem of inability to adaptively optimize according to driver feedback is solved.

[0006] The technical solution adopted by the application is as follows: In a first aspect, the application provides a power transmission control method, which includes the following steps: Collecting calculation parameters, including driving motor speed, driving motor torque, load rate, battery capacity, ambient temperature and vehicle speed; The collected calculation parameters are standardized to obtain standardized calculation parameters, weights are assigned to the calculation parameters according to the influence degree of the calculation parameters on the power disconnection or engagement trend, and the current power demand of the vehicle is calculated based on the standardized calculation parameters and the weights to obtain a comprehensive judgment value for representing the power state switching demand; An engagement threshold for power engagement control and a disconnection threshold for power disconnection control are set; When the comprehensive judgment value reaches the disconnection threshold, or when at least one of the following conditions is met: the vehicle speed is greater than a preset vehicle speed condition, the torque demand is less than a preset torque condition, and the battery power is lower than a preset power condition, the power disconnection control is executed; When the comprehensive judgment value reaches the engagement threshold, or when the vehicle is in an operating mode that requires improved driving capability, the power engagement control is executed.

[0007] Further, when performing power engagement determination, the comprehensive judgment value is temperature compensated according to the difference between the ambient temperature and the preset optimal working temperature; When performing power disconnection determination, the comprehensive judgment value is compensated for speed fluctuation according to the difference between the current speed of the drive motor and the target speed; Wherein, the temperature compensation is used to correct the comprehensive judgment value to reflect the influence of temperature change on power demand when engaging, and the speed fluctuation compensation is used to correct the comprehensive judgment value to reflect the influence of speed change on power demand when disengaging.

[0008] Further, the calculation of the comprehensive judgment value includes: The standardized calculation parameters are weighted according to the weights of the parameters, and based on the weighted results, an engagement judgment value for power engagement determination and a disconnection judgment value for power disconnection determination are constructed respectively; When the engagement judgment value is greater than the engagement threshold, the power engagement control is executed; When the disconnection judgment value is less than the disconnection threshold, the power disconnection control is executed; The engagement judgment value The disconnection judgment value are determined according to the following formulas respectively:

[0009]

[0010] Wherein, is the i-th standardized calculation parameter; is the weight corresponding to the i-th standardized calculation parameter; is the difference between the current ambient temperature and the preset optimal working temperature; is the difference between the current speed of the drive motor and the target speed; is the temperature compensation coefficient when engaging; is a break-off time speed fluctuation compensation coefficient; The ambient temperature and the driving motor speed are both used as standardized calculation parameters in the weighted calculation, and are also used to modify the engagement decision value and the break-off decision value in the form of deviation through the temperature compensation term and the speed fluctuation compensation term respectively.

[0011] Further, after the power engagement control or the power break-off control is executed, the parameter weight or the compensation coefficient used for calculating the comprehensive decision value is linearly self-adaptively adjusted based on the driver's operation behavior, including: After the power engagement or break-off is automatically executed by the system, it is monitored whether the driver performs a manual reverse switching operation on the power state within a preset time window; When the manual reverse switching is detected within the time window, the time interval between the system automatically completing the engagement or break-off operation and the driver performing the reverse switching is recorded, and a linear proportional adjustment coefficient used for adjusting the decision value is determined according to the time interval, the adjustment coefficient increasing with the decrease of the time interval; When the driver's reverse engagement operation is received after the system automatically performs the break-off, the break-off decision value is adjusted, so that the trend of the break-off decision value decreasing is weakened; When the driver's reverse break-off operation is received after the system automatically performs the engagement, the engagement decision value is adjusted, so that the trend of the engagement decision value increasing is weakened.

[0012] Further, the adjustment of the engagement decision value or the break-off decision value satisfies the following steps: The proportional adjustment coefficient is calculated When the driver performs the reverse engagement operation after the system automatically breaks off, the break-off decision value is updated according to the following formula:

[0013] When the driver performs the reverse break-off operation after the system automatically engages, the engagement decision value is updated according to the following formula:

[0014] wherein t is the time interval between the system automatically completing the power switching and the driver performing the reverse switching, is a preset time window, is a break-off threshold value, is an engagement threshold value.

[0015] In the second aspect, the application provides a power transmission control system, which adopts the power transmission control method as described in the first aspect, and the system comprises: A detection unit is configured to collect driving motor speed, torque, load rate, battery power, ambient temperature and vehicle speed parameters; ​A processor is electrically connected with the detection unit, configured to calculate a comprehensive determination value based on the operating parameter, and determine a control instruction of power engagement or power disengagement according to a threshold relationship between the engagement determination value and the disengagement determination value. An execution device is electrically connected with the processor, configured to implement an engagement action when receiving the power engagement control instruction, and implement a disengagement action when receiving the power disengagement control instruction.

[0016] Further, the execution device includes: An eccentric shaft swing and longitudinal mechanism is configured to generate an axial thrust during the power engagement or disengagement; An execution motor is configured to drive the eccentric shaft swing and longitudinal mechanism to implement a thrust action; A driving dog is connected with the eccentric shaft swing and longitudinal mechanism, and moves along an axial direction under the thrust action of the eccentric shaft swing and longitudinal mechanism to selectively separate or engage with a driven dog; The driven dog is arranged on a differential half shaft hub, and forms a separable transmission engagement structure with the driving dog; A planetary gear train is used to form a corresponding power transmission path according to the power engagement or disengagement state; A split differential case is used to accommodate the driving dog and the driven dog, and provides structural mounting support.

[0017] Further, the eccentric shaft swing and longitudinal mechanism includes an eccentric shaft, a following swing block, and a sliding sleeve, the eccentric shaft rotates around an axis under the driving of the execution motor, the following swing block is in contact with an eccentric segment of the eccentric shaft and generates a linear displacement along the sliding sleeve in an axial direction under the driving of the eccentric rotation, and the displacement of the following swing block is used to apply an axial thrust to the driving dog to implement the engagement or separation.

[0018] In a third aspect, the present application provides a terminal, including: A memory is used to store a power transmission control program; A processor is used to implement the steps of the power transmission control method according to the first aspect when executing the power transmission control program.

[0019] In a fourth aspect, the present application provides a computer readable storage medium, the storage medium stores computer instructions, when the computer reads the computer instructions in the storage medium, the computer executes the power transmission control method according to the first aspect.

[0020] It can be seen from the above technical solutions that the present application has the following advantages: By standardizing and weighting a plurality of operating parameters to form a comprehensive decision value, the decision of power engagement and disengagement can reflect the current real working condition of the vehicle, avoiding the misjudgment problem caused by the traditional fixed threshold. By introducing a double-threshold structure of engagement decision value and disengagement decision value, the power switching timing is more accurate, which helps to reduce frequent switching and improve the reliability of power response. The supplementary decision mechanism formed by combining vehicle speed, torque, power and other conditions can trigger power switching in time under special working conditions, improving the safety and adaptability of the system.

[0021] By introducing compensation factors such as torque demand, temperature state, and speed difference in power engagement or disengagement decision, the calculation of comprehensive decision value can reflect the influence of instantaneous working condition on power switching trend, so that the decision logic is no longer dependent on a single parameter, and the sensitivity of the algorithm to complex working condition changes is improved. This compensation mechanism can intervene in advance to adjust when the motor temperature rises, power demand changes suddenly, or the speed difference is abnormal, improving the accuracy of power switching.

[0022] By introducing a linear adaptive adjustment mechanism based on the driver's reverse operation behavior, the power switching logic has self-learning and self-correction ability. When the driver expresses dissatisfaction by manually reversing the operation after the system automatically switches, the system can automatically adjust the decision logic based on time interval, so that the power control is more in line with the driver's habits and continuously optimized, avoiding mis-switching or unnecessary power lag in long-term use. This mechanism enables the system to adaptively evolve under different driving styles, improving user experience.

[0023] By introducing linear proportional update formulas for engagement decision value and disengagement decision value respectively, the adjustment process of the decision logic has continuity, controllability and stability. The design that the adjustment amount is inversely proportional to the reverse operation time interval can ensure that the stronger the driver's intention, the greater the system's update strength of the decision value; and when the driver's intervention is weak, the system only makes fine tuning, so that the overall strategy is sensitive but not overcorrected, ensuring that the power switching logic remains stable and reliable in long-term operation.

[0024] The eccentric shaft swing and longitudinal mechanism can provide stable axial thrust under the premise of compact size, and the separable meshing structure of the driving disc and the driven disc can realize fast and reliable power engagement or disengagement. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the present application, the drawings needed in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1A schematic diagram of the steps of the power transmission control method in the embodiment; Figure 2 A schematic diagram of the structure of the execution device in the embodiment; Figure 3 A schematic diagram of the structure of the eccentric shaft swing and longitudinal mechanism and the planetary gear set; Figure 4 A schematic diagram of the structure of the driving gear; Figure 5 A schematic diagram of the structure of the driven gear; Figure 6 A schematic diagram of the structure of the sliding sleeve.

[0027] In the figure: 1, execution motor; 2, driving gear; 3, driven gear; 4, planetary gear set; 5, split differential case; 6, eccentric shaft; 7, swing block; 8, sliding sleeve. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described in connection with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0029] Please refer to Figure 1 The present application provides a power transmission control method, which comprises: Step S1, collecting calculation parameters, the calculation parameters comprising driving motor speed, driving motor torque, load rate, battery capacity, ambient temperature and vehicle speed; In a specific embodiment, the calculation parameters are collected in real time by the multi-source sensors arranged on the vehicle, the driving motor speed can be measured by the motor Hall speed sensor or high-speed encoder, the driving motor torque can be obtained by the motor controller based on the current, voltage and flux linkage estimation model, the load rate can be calculated based on the total mass of the vehicle, acceleration and wheel end resistance model, the battery capacity is provided by the battery management system, the ambient temperature is obtained by the temperature sensor arranged near the vehicle power compartment or driving module, and the vehicle speed is output by the wheel speed sensor or vehicle speed fusion algorithm. In the embodiment, the system reads the above-mentioned parameters at a fixed period, for example, 20 ms as a control period, and forms data interaction with the power switching control module. In order to ensure the accuracy of collection, abnormal data can be removed, for example, when the motor speed is detected to be suddenly changed beyond the reasonable range, the latest valid value is used to replace it, so as to ensure the stability and reliability of subsequent calculation.

[0030] In another embodiment, the system performs a safety boundary check on the battery power and the ambient temperature, for example, when the battery power is lower than 10% or the temperature is higher than a certain threshold, the system will be forced to mark as a high-risk state, so that the subsequent step of the decision logic can identify the power decline trend and provide evidence for power switching in advance.

[0031] Step S2, the collected calculation parameters are standardized to obtain standardized calculation parameters, the influence degree of each calculation parameter on the power disconnection or connection trend is assigned a corresponding weight, and the current power demand of the vehicle is weighted calculated based on the standardized calculation parameters and the weight to obtain a comprehensive judgment value for representing the power state switching demand; In a specific embodiment, the standardization process can include converting parameters of different dimensions into a unified dimensionless interval, for example, the speed, torque, vehicle speed, power, etc. are mapped to 0 to 1 according to their effective range, so that they can be directly weighted calculated. In actual application, the standardized torque and power can more directly reflect whether the current power is sufficient, and the standardized load rate represents the urgency of power demand. Then, according to engineering experience or historical data, weights are assigned to each parameter. In the working condition where the torque demand is high, the weight of the torque parameter can be appropriately increased to enhance the sensitivity of power connection.

[0032] In an embodiment, the system trains a set of initial weight combinations through historical operation data, which can reflect typical driving characteristics. For example, in urban road working conditions, the vehicle speed changes frequently, and the system enhances the influence of vehicle speed on power switching trend, so that the opening and closing of connection or disconnection is more sensitive. In high-speed cruising working conditions, the speed weight can be appropriately reduced, so that the power switching logic pays more attention to the torque and power trend, avoiding frequent switching to reduce driving experience. Through the above-mentioned manner, the system obtains a comprehensive judgment value, which can accurately represent the current trend of the vehicle being more suitable for power connection or disconnection.

[0033] Step S3, setting a connection threshold for power connection control and a disconnection threshold for power disconnection control; In a specific embodiment, the connection threshold and the disconnection threshold are generated in a interval separation manner, so that a certain difference is maintained between them, thereby forming a hysteresis judgment interval to avoid frequent switching of power state. For example, in a period of time when the comprehensive judgment value tends to connect, the connection threshold can be maintained at a high level, so that the system performs the connection action after the power demand is stable, thereby improving the action reliability.

[0034] In an embodiment, the system dynamically adjusts the threshold according to the running mode of the vehicle. When the vehicle is in a slope starting scene with large traction load, the system can reduce the connection threshold to achieve a more rapid power response; when the vehicle is in an energy recovery priority mode, the disconnection threshold is appropriately increased, so that the system tends to maintain the power disconnection state to reduce energy loss.

[0035] In another embodiment, the threshold generation module can smooth the historical trend of the integrated decision value, for example, using a sliding window to count the fluctuation of the integrated decision value. When the fluctuation is large, the threshold interval for engagement and disengagement can be appropriately expanded to reduce the possibility of misjudgment, making the system more stable in complex working conditions.

[0036] Step S4, when the integrated decision value reaches the disengagement threshold, or when at least one of the following conditions is met: the vehicle speed is greater than the preset vehicle speed condition, the torque demand is less than the preset torque condition, and the battery power is lower than the preset power condition, the power disengagement control is executed. When the integrated decision value reaches the engagement threshold, or when the vehicle is in an operating mode that requires improved driving capability, the power engagement control is executed.

[0037] In a specific embodiment, when the integrated decision value enters the disengagement region, the control module sends a disengagement instruction to the power execution device, causing the shifting mechanism to drive the driving disc to disengage from the driven disc. To ensure smooth disengagement, the execution device adjusts the shifting speed according to the friction state of the mechanism and the current mechanical load, for example, using a slower exit speed in high-speed driving state to reduce structural impact.

[0038] In an embodiment, when the vehicle speed exceeds a certain threshold or the power is at a low level, the system directly triggers the disengagement control as an auxiliary condition to ensure that energy is prioritized when power supply is insufficient, improving the overall safety of the system. When the torque demand is close to zero, such as when the vehicle is in a coasting or long downhill state, the system also performs the disengagement action in advance to reduce mechanical transmission loss.

[0039] In another embodiment, the system evaluates the speed difference before disengagement, and when the speed difference is large, it temporarily delays or adjusts the action speed of the execution device to avoid disengagement at inappropriate times, thereby improving mechanical reliability.

[0040] In a specific embodiment, the power engagement control, upon receiving an engagement instruction, drives the driving disc to move towards the driven disc. During mechanical engagement, the system can determine whether to adjust the engagement speed based on the speed, torque, and state of the driving motor to avoid engagement impact. When the speed difference is small or the torque demand is high, the system completes engagement at a faster speed to improve power response; when the speed difference is large, the engagement pushing speed is reduced to make the tooth surface enter the meshing more smoothly.

[0041] In an embodiment, when the vehicle enters a strong power demand scenario, such as rapid overtaking, steep slope acceleration, etc., the control module can execute the engagement action in advance when the integrated decision value has not yet reached the engagement threshold, so that the power system can quickly recover to the traction state, improving the transient performance of the vehicle.

[0042] In another embodiment, to avoid excessive mechanical wear caused by frequent engagement actions, the system combines historical engagement times, current temperature, and vehicle driving conditions to determine whether to allow immediate execution of the engagement instruction; when the temperature is too high or the structure is in an overload state, the system automatically limits the engagement speed or applies a short delay to improve durability.

[0043] In some embodiments, when performing the power engagement determination, the comprehensive determination value is temperature compensated according to the difference between the ambient temperature and the preset optimal working temperature; When performing the power disengagement determination, the comprehensive determination value is speed fluctuation compensated according to the difference between the current speed of the drive motor and the target speed; Wherein, the temperature compensation is used to correct the comprehensive determination value to reflect the influence of temperature change on power demand when engaging, and the speed fluctuation compensation is used to correct the comprehensive determination value to reflect the influence of speed change on power demand when disengaging.

[0044] In the specific implementation, the temperature compensation can obtain the real-time temperature by reading the temperature sensor arranged in the motor shell or the interior of the power compartment, and compare it with the optimal working temperature interval determined in the vehicle calibration stage. For example, when the ambient temperature is low, to avoid mechanical impact caused by insufficient lubrication of gear meshing, the system will add a certain positive correction to the comprehensive determination value, so that the power engagement action is more cautious. Similarly, in a high temperature scenario, to reduce the thermal load of the components, the temperature factor in the comprehensive determination value will make the system more inclined to delay the engagement.

[0045] When performing the disengagement determination, the system obtains the real-time speed from the motor controller, and obtains the target speed suitable for the current working condition through table lookup or interpolation. When the speed deviation is large, the speed fluctuation compensation will make the comprehensive determination value more close to the disengagement trend, ensuring that the disengagement action is completed before the speed deviation is too large, thereby reducing the impact on the gear surface. In an embodiment, when the system detects that the motor speed oscillates or jumps, it will increase the influence weight of the speed compensation, so that the comprehensive determination value more quickly reflects the instability of the power system.

[0046] In some embodiments, the calculation of the comprehensive determination value includes: The standardized calculation parameters are weighted calculated according to the weight of each parameter, and the weighted results are used to construct an engagement determination value for power engagement determination and a disengagement determination value for power disengagement determination; The engagement determination value is greater than the engagement threshold value, and the power engagement control is executed; The disengagement determination value is less than the disengagement threshold value, and the power disengagement control is executed; The engagement determination value The disengagement determination value Determined according to the following formula respectively:

[0047]

[0048] wherein, is the ith normalized calculation parameter, and in this embodiment, there are 5 normalized calculation parameters, respectively corresponding to is the driving motor speed, the driving motor torque, the load rate, the ambient temperature, and the vehicle speed; is the weight corresponding to the ith normalized calculation parameter, and in this embodiment, are 0.25, 0.3, 0.2, 0.15, and 0.1, respectively; is the difference between the current ambient temperature and the preset optimal working temperature; is the difference between the current driving motor speed and the target speed; is the temperature compensation coefficient when engaged, and in this embodiment, it is 0.13; is the speed fluctuation compensation coefficient when disengaged, and in this embodiment, it is 0.07; The ambient temperature and the driving motor speed are both used as normalized calculation parameters to participate in weighted calculation, and are also respectively modified to the engagement decision value and the disengagement decision value in the form of deviation through the temperature compensation term and the speed fluctuation compensation term.

[0049] In a specific embodiment, the system uses a set of weights obtained from historical working conditions training or manual calibration to weight the normalized parameters, so that the influence of different parameters on the final decision is adjustable and controllable. For example, in the full load or drag working condition of the vehicle, the system can increase the load rate weight, so that the decision value pays more attention to the power demand. In the economy mode, the weight of the electric quantity parameter will be appropriately increased, so that the system is more inclined to disengage the power system to save energy without affecting the power.

[0050] In one embodiment, the engagement decision value and the disengagement decision value use different parameter combinations, so that the two types of actions pay attention to the mechanical engagement ability and the power transmission demand, respectively. When the engagement decision value exceeds the set threshold value, the system triggers engagement to restore power transmission; when the disengagement decision value is lower than the threshold value, the system performs disengagement to reduce energy loss. In another embodiment, to avoid frequent switching, the system performs time smoothing on the decision value, that is, it requires that the engagement or disengagement condition be met for a plurality of consecutive control periods before performing the action.

[0051] In some embodiments, after performing the power engagement control or the power disengagement control, the parameter weight or the compensation coefficient used to calculate the comprehensive decision value is linearly self-adaptively adjusted based on the driver's operation behavior, including: After the power engagement or disengagement is automatically performed by the system, it is monitored whether the driver performs a manual reverse switching operation on the power state within a preset time window; detecting a manual reverse switch within a time window, recording a time interval between the system automatically completing the engagement or disengagement operation and the driver performing the reverse switch, determining a linear proportional adjustment coefficient for adjusting the decision value according to the time interval, the adjustment coefficient increasing as the time interval decreases; when receiving a reverse engagement operation of the driver after the system automatically performing disengagement, adjusting the disengagement decision value to weaken the tendency of the disengagement decision value decreasing; when receiving a reverse disengagement operation of the driver after the system automatically performing engagement, adjusting the engagement decision value to weaken the tendency of the engagement decision value increasing.

[0052] In an embodiment, the system performs outlier rejection on parameters such as motor speed, torque and power before generating the decision value, to avoid false judgment caused by transient noise. When detecting that the deviation of temperature or speed exceeds a safe range, the correction term is significantly enhanced, so that the system prioritizes ensuring the stability of the power system.

[0053] In another embodiment, the compensation coefficient can be automatically learned and optimized by the system under different environments. For example, in vehicles that run more in cold regions, the temperature compensation coefficient will automatically increase over time, making the system more suitable for typical working conditions.

[0054] In the specific implementation, the system uses independent decision value structures, so that the engagement logic and disengagement logic consider different influencing factors respectively. For example, the engagement decision value pays more attention to temperature deviation, because too low temperature may cause insufficient lubrication, and too high temperature may cause metal expansion, both of which will affect the engagement quality; the disengagement decision value pays more attention to speed fluctuation, because the power train is still under stress before disengagement, so it should be ensured that disengagement is performed when the speed difference is appropriate.

[0055] In the specific implementation, when the system automatically performs power switching and detects the reverse operation of the driver, the system regards this behavior as the feedback of the driver's dissatisfaction with the current strategy, and thus adaptively adjusts the decision logic. For example, if the driver re-executes engagement shortly after disengagement, it means that the disengagement judgment of the system is too aggressive, and the disengagement tendency needs to be reduced; otherwise.

[0056] In an embodiment, the system identifies the reverse intention of the driver through the steering wheel switch, gear selector or driving mode selection instruction. Once the reverse action is identified, the system immediately calculates the corresponding time interval and adjusts the decision value accordingly.

[0057] In another embodiment, the system records several reverse operations and gradually corrects the decision structure in a cumulative manner, so that the vehicle can automatically cater to the habits of the driver after being used for a period of time, thereby reducing the number of human interventions and improving the overall experience.

[0058] In some embodiments, the adjustment of the engagement decision value or disengagement decision value satisfies the following steps: calculating a proportional adjustment coefficient ; When the driver performs a reverse engagement operation after the system automatically disengages, the disengagement decision value is updated according to the following formula:

[0059] When the driver performs a reverse disengagement operation after the system automatically engages, the engagement decision value is updated according to the following formula:

[0060] where t is the time interval between the system automatically completing power switching and the driver performing a reverse switching, is a preset time window, is a disengagement threshold value, is an engagement threshold value.

[0061] In the specific implementation, the proportional adjustment coefficient is used to represent the urgency of the driver's feedback. The shorter the time, the less the driver agrees with the current switching timing of the system, and thus the greater the adjustment. In actual application, the system will filter the recorded time to avoid unnecessary correction caused by driver's misoperation.

[0062] In an embodiment, when the system automatically disengages and soon receives an engagement instruction, the disengagement decision value is moderately pushed closer to the disengagement threshold value, so that the future disengagement condition becomes more stringent, thereby reducing the recurrence of similar misjudgments.

[0063] In another embodiment, the adjustment of the engagement decision value also follows a similar principle. If the driver quickly performs a disengagement instruction after engagement, the system will weaken the engagement logic, making future engagement more cautious. Through repeated adjustment, the system gradually forms a power switching logic suitable for the current driving user and maintains stability in the long-term operation, and will not cause excessive adjustment due to single feedback.

[0064] Please refer to Figures 2-6 In some embodiments, the present application provides a power transmission control system, which adopts the power transmission control method. The system comprises: a detection unit configured to collect driving motor speed, torque, load rate, battery capacity, environmental temperature and vehicle speed parameters; In the specific embodiment, the detection unit can include a Hall-type rotating speed sensor, a current sampling module built in the motor controller, a control algorithm for estimating torque based on voltage and current, a state of charge detection module provided by the battery management system, and a temperature sampling probe arranged in the power cabin, etc. Among them, the vehicle speed can be obtained through the wheel speed sensor or the inertial navigation system. In an embodiment, the detection unit uploads the collected data to the processor at a fixed period, for example, with a sampling period of 10 ms or 20 ms, so as to ensure the real-time performance of the power switching determination. In another embodiment, the detection unit has an abnormal value filtering function, when a sudden change in rotating speed, a current spike or a jump in temperature data is detected, the most recent reliable data is used for replacement, so as to improve the overall stability of the system. In addition, the detection unit can automatically adjust the sampling frequency according to the current working condition of the vehicle, for example, in complex road conditions or rapid speed change working conditions, the sampling frequency is increased to obtain more detailed power state information.

[0065] The processor is electrically connected with the detection unit, and is configured to calculate a comprehensive determination value based on the operating parameters, and determine a control instruction of power engagement or power disengagement according to a threshold relationship between the engagement determination value and the disengagement determination value; In the specific embodiment, the processor can be a vehicle central controller, an electric drive controller or an independent power switching control unit. After receiving the operating parameters uploaded by the detection unit, the processor first performs data validity check on each parameter, then converts the parameters into dimensionless values according to the standardized rules set by the system, and then calculates a comprehensive determination value in combination with the weights. In an embodiment, the processor adopts a hysteresis determination structure, that is, the engagement threshold value and the disengagement threshold value maintain a certain difference, so that the power switching action has stability and avoids frequent switching in and out in the critical interval. In another embodiment, the processor dynamically changes the threshold strategy according to the vehicle operating mode, for example, increases the disengagement tendency in the energy saving mode, and reduces the engagement threshold in the sports mode. Before generating the power engagement or disengagement instruction, the processor also performs logical check on the mechanical execution conditions, for example, judges whether the rotating speed difference is in the allowed interval and whether the system temperature is safe, so as to avoid executing switching when the mechanical conditions are not suitable.

[0066] The execution device is electrically connected with the processor, and realizes the engagement action when receiving the power engagement control instruction, and realizes the disengagement action when receiving the power disengagement control instruction.

[0067] In some embodiments, the execution device includes: The eccentric shaft swing and longitudinal mechanism is configured to generate an axial thrust during the power engagement or disengagement process; The execution motor 1 is configured to drive the eccentric shaft swing and longitudinal mechanism to realize the thrust action; The driving gear 2 is connected with the eccentric shaft swing and longitudinal mechanism, and moves along the axial direction under the thrust action of the eccentric shaft swing and longitudinal mechanism to selectively separate or engage with the driven gear 3; The passive gear plate 3 is arranged on the differential half shaft hub and forms a detachable transmission meshing structure with the driving gear plate 2. The planetary gear set 4 is used to form a corresponding power transmission path according to the power engagement or disengagement state. The split differential case 5 is used to accommodate the driving gear plate 2 and the passive gear plate 3 and provides structural mounting support.

[0068] In some embodiments, the eccentric shaft swing and longitudinal movement mechanism includes an eccentric shaft 6, a follower swing block 7 and a sliding sleeve 8. The eccentric shaft 6 rotates around the shaft center under the driving of the motor 1. The follower swing block 7 is in contact with the eccentric segment of the eccentric shaft 6 and generates linear displacement along the sliding sleeve 8 under the driving of the eccentric rotation. The displacement of the follower swing block 7 is used to apply an axial thrust to the driving gear plate 2 to achieve engagement or disengagement.

[0069] In the specific embodiment, the execution device can include a driving motor, an eccentric shaft 6 swing assembly, a moving sliding block and a driving gear plate 2 pushing mechanism, etc. When the processor issues an engagement instruction, the execution device drives the pushing mechanism to move in the engagement direction, so that the driving gear plate 2 gradually contacts and finally engages with the passive gear plate 3. Under the disengagement instruction, the pushing mechanism is executed in the opposite direction, and the driving gear plate 2 moves away from the passive gear plate 3, thereby cutting off the power transmission. In an embodiment, the execution device can automatically adjust the thrust output according to the mechanical resistance and the execution speed to realize stable action characteristics in different environments. In another embodiment, the execution device can also collect the execution position and the action speed for feedback to the processor to judge whether the engagement is successful or whether secondary adjustment is needed, thereby improving the control accuracy and mechanical reliability. The execution device can complete the power switching in a short time, so that the system has good responsiveness and power smoothness during driving.

[0070] In some embodiments, the present application provides a terminal, comprising: a memory for storing a power transmission control program; a processor for executing the power transmission control program to realize the steps of the power transmission control method.

[0071] In some embodiments, the present application provides a computer readable storage medium, which stores computer instructions. When the computer reads the computer instructions in the storage medium, the computer executes the power transmission control method.

[0072] The above description is only a preferred embodiment of one or more embodiments of the present specification, and does not limit one or more embodiments of the present specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of one or more embodiments of the present specification shall be included in the protection scope of one or more embodiments of the present specification.

Claims

1. A power transmission control method characterized by comprising: The method comprises the following steps: collecting calculation parameters, the calculation parameters including driving motor speed, driving motor torque, load rate, battery power, ambient temperature and vehicle speed; standardizing the collected calculation parameters to obtain standardized calculation parameters, assigning corresponding weights according to the influence degree of each calculation parameter on the power disconnection or connection trend, and performing weighted calculation on the current power demand of the vehicle based on the standardized calculation parameters and the weights to obtain a comprehensive judgment value for representing the power state switching demand; setting an engagement threshold for power engagement control and a disengagement threshold for power disconnection control; when the comprehensive judgment value reaches the disengagement threshold, or when at least one of the following conditions is met: the vehicle speed is greater than a preset vehicle speed condition, the torque demand is less than a preset torque condition, and the battery power is lower than a preset power condition, the power disconnection control is executed; when the comprehensive judgment value reaches the engagement threshold, or when the vehicle is in an operating mode that requires improved driving capability, the power engagement control is executed.

2. The power transmission control method according to claim 1 characterized by, When performing power engagement judgment, the comprehensive judgment value is temperature compensated according to the difference between the ambient temperature and the preset optimal working temperature; When performing power disconnection judgment, the comprehensive judgment value is speed fluctuation compensated according to the difference between the current speed of the driving motor and the target speed. The temperature compensation is used to correct the comprehensive judgment value to reflect the influence of temperature change on power demand when engaging, and the speed fluctuation compensation is used to correct the comprehensive judgment value to reflect the influence of speed change on power demand when disengaging.

3. The power transmission control method according to claim 2, characterized by, The calculation of the comprehensive judgment value comprises: performing weighted calculation on the standardized calculation parameters according to the weights of each parameter, and constructing an engagement judgment value for power engagement judgment and a disengagement judgment value for power disconnection judgment based on the weighted results; when the engagement judgment value is greater than the engagement threshold, the power engagement control is executed; when the disengagement judgment value is less than the disengagement threshold, the power disconnection control is executed; engagement determination value disengagement determination value respectively determined in accordance with the following equations: wherein, is the ith normalized calculation parameter; is the weight corresponding to the ith normalized calculation parameter; is the difference between the current ambient temperature and the preset optimal working temperature; is the difference between the current rotation speed of the driving motor and the target rotation speed; is the temperature compensation coefficient when engaged; is the rotation speed fluctuation compensation coefficient when disengaged; The ambient temperature and the driving motor speed are both used as standardized calculation parameters for weighted calculation, and are also used to correct the engagement judgment value and the disengagement judgment value in the form of deviation through the temperature compensation term and the speed fluctuation compensation term, respectively.

4. The power transmission control method according to claim 2 or 3, characterized by, After the power engagement control or the power disconnection control is executed, the parameter weights or the compensation coefficients used to calculate the comprehensive judgment value are linearly self-adaptively adjusted based on the driver's operation behavior, comprising: After the power engagement or disconnection is automatically executed by the system, it is monitored whether the driver performs a manual reverse switching operation on the power state within a preset time window; When the manual reverse switching is detected within the time window, the time interval between the automatic completion of the engagement or disconnection operation by the system and the execution of the reverse switching by the driver is recorded, and a linear proportional adjustment coefficient for adjusting the judgment value is determined according to the time interval, which increases with the decrease of the time interval; When the driver's reverse engagement operation is received after the system automatically executes disconnection, the disengagement judgment value is adjusted to weaken the trend of decreasing the disengagement judgment value; When the driver's reverse disconnection operation is received after the system automatically executes engagement, the engagement judgment value is adjusted to weaken the trend of increasing the engagement judgment value.

5. The power transmission control method according to claim 4, characterized by, The adjustment of the engagement judgment value or the disengagement judgment value satisfies the following steps: Computing a scaling factor ; When the driver performs a reverse engagement operation after the system automatically disconnects, the disengagement judgment value is updated according to the following formula: When the driver performs the reverse disengagement operation after the system automatically engages, the engagement determination value is updated according to the following formula: wherein t is the time interval between the system automatically completing the power shift to the driver performing the reverse shift, is a predetermined time window, is a disengagement threshold, is an engagement threshold.

6. A power transmission control system characterized by comprising: The system comprises: The detection unit is configured to collect the driving motor speed, torque, load rate, battery power, ambient temperature and vehicle speed parameters; The processor is electrically connected with the detection unit and is configured to calculate the comprehensive determination value based on the operating parameters, and determine the power engagement or power disengagement control instruction according to the threshold relationship between the engagement determination value and the disengagement determination value; The execution device is electrically connected with the processor, and realizes the engagement action when receiving the power engagement control instruction, and realizes the disengagement action when receiving the power disengagement control instruction.

7. The power transmission control system according to claim 6, characterized by, The execution device comprises: The eccentric shaft swing and longitudinal mechanism is configured to generate an axial thrust during power engagement or disengagement; The execution motor (1) is configured to drive the eccentric shaft swing and longitudinal mechanism to realize the thrust action; The driving dog plate (2) is connected with the eccentric shaft swing and longitudinal mechanism and moves axially under the thrust action of the eccentric shaft swing and longitudinal mechanism to selectively separate or engage with the driven dog plate (3); The driven dog plate (3) is arranged on the differential half shaft hub and forms a detachable transmission engagement structure with the driving dog plate (2); The planetary gear train (4) is used to form a corresponding power transmission path according to the power engagement or disengagement state; The split differential case (5) is used to accommodate the driving dog plate (2) and the driven dog plate (3) and provide structural mounting support.

8. The power transmission control system according to claim 7, characterized by, The eccentric shaft swing and longitudinal mechanism comprises an eccentric shaft (6), a follow-up swing block (7) and a sliding sleeve (8), the eccentric shaft (6) rotates around the shaft center under the driving of the execution motor (1), the follow-up swing block (7) is in contact with the eccentric segment of the eccentric shaft (6) and generates linear displacement axially along the sliding sleeve (8) under the eccentric rotation driving, and the displacement of the follow-up swing block (7) is used to apply an axial thrust to the driving dog plate (2) to realize engagement or separation.

9. A terminal, characterized by comprising: It comprises: The storage medium stores computer instructions, and when the computer reads the computer instructions in the storage medium, the computer executes the power transmission control method as claimed in claim 1. The storage medium stores computer instructions, and when the computer reads the computer instructions in the storage medium, the computer executes the power transmission control method as claimed in claim 1.

10. A computer-readable storage medium, characterized in that, ​

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