Gearbox gear shifting control method, system and equipment and storage medium

Abstract

The invention discloses a gearbox gear shifting control method, system and equipment and a storage medium, and relates to the field of auxiliary driving, current is adjusted according to clutch oil pressure monitored in real time, and when the oil charge amount reaches a preset value and the pre-charge time is over, the current is controlled to set pressure to maintain required current. The oil filling amount can be accurately controlled, it is ensured that the clutch has enough oil supply in the gear shifting process, and unsmooth gear shifting caused by insufficient oil is avoided. In the overlapping stage, the actual oil pressure of the clutch is controlled according to the whole vehicle load and torque data, gear shifting is completed, in this way, smoothness in the gear shifting process can be ensured, and gear shifting failure or vehicle shaking caused by improper oil pressure control is avoided. The actual oil pressure of the clutch is compared with the preset required oil pressure, the pre-charging time compensation value during next gear shifting is determined, in this way, the gear shifting strategy can be further optimized, and gear shifting delay or impact caused by improper setting of the pre-charging time is reduced.

Description

Technical Field

[0001] The present invention relates to the field of assisted driving technology, and in particular to a transmission shift control method, system, device and storage medium. Background Art

[0002] CVT (Continuously Variable Transmission) achieves infinitely variable speeds through continuously variable transmission ratios, subverting the fixed gear ratio mode of traditional transmissions. The core of the CVT transmission lies in the power transmission mechanism, which achieves smooth power transmission through the combination of a pair of conical wheels and a steel belt or chain. This design enables the CVT transmission to provide a smooth acceleration experience during driving, without the frustration of traditional transmission shifting. The CVT transmission can achieve smooth power output according to the driver's intentions and vehicle driving conditions.

[0003] Although CVT transmissions are favored for their smoothness and fuel economy, there are also some problems in actual use. First, CVT transmissions may slip when subjected to high torque, especially when accelerating sharply or overtaking, which may cause the steel belt to break or the cone wheel to wear, affecting the service life of the transmission. Secondly, the oil supply circuit of the solenoid valve of the CVT transmission is prone to leakage due to wear. Insufficient oil supply to the solenoid valve will directly affect the solenoid valve's regulation of oil pressure, resulting in limited and abnormal acceleration performance of the transmission, or even acceleration tremors and abnormal noises. For vehicles with variable working conditions such as large agricultural tractors, CVT transmissions will frequently switch gears. Long-term operation may cause changes in the electrical parameters of the clutch solenoid valve. There are also consistency issues with the solenoid valve, which means that the same parameters cannot be applied to all transmissions. Insufficient clutch oil filling or pressure fluctuations will be shown on some vehicles. The final performance on the vehicle is that the vehicle will break through, and the driving experience at the shift point is uncomfortable, which cannot well reflect the advantages of continuously variable transmission. Summary of the invention

[0004] The main purpose of the present invention is to provide a gearbox shift control method, system, device and storage medium. By adjusting the current according to the real-time monitored clutch oil pressure, the oil filling amount can be accurately controlled to ensure that the clutch has sufficient oil supply during the shift process, avoiding the shifting not smooth due to insufficient oil. When the oil filling amount reaches the preset value and the pre-filling time is over, the current is controlled to the set pressure to maintain the required current, so as to ensure that the clutch has a stable oil pressure during the shift and reduce the impact during the shifting process. In the overlapping stage, the actual clutch oil pressure is controlled according to the vehicle load and torque data to complete the shift, so as to ensure the smoothness of the shifting process and avoid the shifting failure or vehicle shaking caused by improper oil pressure control. By comparing the actual clutch oil pressure with the preset required oil pressure, the pre-filling time compensation value for the next shift is determined, so that the shifting strategy can be further optimized and the shifting delay or impact caused by improper pre-filling time setting can be reduced.

[0005] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0006] According to a first aspect of an embodiment of the present application, a transmission shift control method is provided, the method comprising:

[0007] In response to a shift command, the solenoid valve is opened to allow oil to flow into the clutch;

[0008] The current is adjusted according to the real-time monitored clutch oil pressure to control the oil filling amount;

[0009] When the oil filling amount reaches a preset value and the pre-filling time ends, the current is controlled to a set pressure to maintain the required current;

[0010] Entering the overlap phase, the actual clutch oil pressure is controlled according to the vehicle load and torque data to complete the gear shift;

[0011] The pre-charge time compensation value for the next gear shift is determined by the actual clutch oil pressure and the preset required oil pressure.

[0012] Optionally, adjusting the current according to the clutch oil pressure monitored in real time to control the oil filling amount includes:

[0013] Real-time monitoring of clutch oil pressure;

[0014] When the clutch oil pressure reaches a preset pre-charge pressure value, the current passing through the solenoid valve is controlled according to a preset pre-charge current curve, so that the current is adjusted from a current pulse state to a pre-charge demand current to control the oil filling amount.

[0015] Optionally, controlling the actual oil pressure of the clutch according to the vehicle load and torque data to complete the gear shift includes:

[0016] According to the monitored vehicle load and torque data, with reference to a preset pressure rise curve, the oil pressure change curve required by the clutch in the overlap stage is determined;

[0017] adjusting the oil flow to the clutch according to the oil pressure change curve to ensure that the actual oil pressure of the clutch changes according to the oil pressure change curve;

[0018] The clutch is tightened by controlling the current of the solenoid valve;

[0019] When the clutch is fully engaged and the actual clutch oil pressure stabilizes at the required level, the gear shift is completed.

[0020] Optionally, determining the pre-charge time compensation value for the next gear shift by comparing the actual clutch oil pressure with a preset required oil pressure includes:

[0021] Obtaining a pressure integral ratio at each time point according to the actual clutch oil pressure and the preset required oil pressure;

[0022] comparing the minimum value of all pressure integral ratios with a preset threshold;

[0023] If the minimum value is less than the preset threshold, a pre-charge time compensation value is determined for the next gear shift.

[0024] Optionally, obtaining a pressure integral ratio at each time point according to the actual clutch oil pressure and the preset required oil pressure includes:

[0025] Real-time monitoring of actual clutch oil pressure;

[0026] Integrating the actual oil pressure of the clutch and time to obtain an actual oil pressure integral;

[0027] The ratio of the actual oil pressure integral to the required pressure integral at each time point is calculated to obtain the pressure integral ratio at each time point; the required pressure integral is the integral of the oil pressure changing with time that is preset according to the clutch properties and the shifting requirements.

[0028] Optionally, determining the pre-charge time compensation value for the next gear shift includes:

[0029] If the actual oil pressure of the clutch is lower than the required pressure, a pre-filling time compensation value is calculated to extend the pre-filling time;

[0030] If the actual oil pressure of the clutch is higher than the required pressure, a pre-filling time compensation value for shortening the pre-filling time is calculated.

[0031] Optionally, opening the solenoid valve to allow oil to flow into the clutch includes:

[0032] Entering the pre-charge stage, the solenoid valve is opened by applying a current pulse, allowing oil to flow into the clutch and generate oil pressure.

[0033] According to a second aspect of an embodiment of the present application, a transmission shift control system is provided, the system comprising:

[0034] An opening module, for opening the solenoid valve in response to a shift command, so that oil flows into the clutch;

[0035] An oil filling quantity control module, used to adjust the current according to the clutch oil pressure monitored in real time to control the oil filling quantity;

[0036] A current control module, used for controlling the current to a set pressure to maintain the required current when the oil filling amount reaches a preset value and the pre-filling time ends;

[0037] Overlap module, used to enter the overlap phase, control the actual clutch oil pressure according to the vehicle load and torque data, and complete the gear shift;

[0038] The compensation value calculation module is used to determine the pre-charge time compensation value for the next gear shift according to the actual oil pressure of the clutch and the preset required oil pressure.

[0039] According to a third aspect of an embodiment of the present application, an electronic device is provided, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method described in the first aspect above.

[0040] According to a fourth aspect of an embodiment of the present application, a computer-readable storage medium is provided, on which computer-readable instructions are stored. The computer-readable instructions can be executed by a processor to implement the method described in the first aspect above.

[0041] In summary, the embodiments of the present application provide a transmission shift control method, system, device and storage medium. By adjusting the current according to the real-time monitored clutch oil pressure, the oil filling amount can be accurately controlled to ensure that the clutch has sufficient oil supply during the shifting process, avoiding the shifting not smooth due to insufficient oil. When the oil filling amount reaches the preset value and the pre-filling time is over, the current is controlled to the set pressure to maintain the required current, so as to ensure that the clutch has a stable oil pressure during the shifting process and reduce the impact during the shifting process. In the overlapping stage, the actual clutch oil pressure is controlled according to the vehicle load and torque data to complete the shifting, so as to ensure the smoothness of the shifting process and avoid the shifting failure or vehicle shaking caused by improper oil pressure control. By comparing the actual clutch oil pressure with the preset required oil pressure, the pre-filling time compensation value for the next shifting is determined, so that the shifting strategy can be further optimized to reduce the shifting delay or impact caused by improper pre-filling time setting. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0043] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0044] Figure 1 A flow chart of a transmission shift control method provided in an embodiment of the present application;

[0045] Figure 2 A schematic diagram of pressure changes during a gear shifting process provided by an embodiment of the present application;

[0046] Figure 3 A shift strategy flow chart provided for an embodiment of the present application;

[0047] Figure 4 A schematic diagram of a transmission shift control system provided in an embodiment of the present application;

[0048] Figure 5 A structural diagram of an electronic device provided in an embodiment of the present application is shown;

[0049] Figure 6 A diagram showing a computer-readable storage medium provided in an embodiment of the present application.

[0050] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0053] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0056] Figure 1 A transmission shift control method provided by an embodiment of the present application is shown, the method comprising:

[0057] Step 101: In response to a shift command, the solenoid valve is turned on to allow oil to flow into the clutch;

[0058] Step 102: adjusting the current according to the clutch oil pressure monitored in real time to control the oil filling amount;

[0059] Step 103: When the oil filling amount reaches a preset value and the pre-filling time ends, the current is controlled to a set pressure to maintain the required current;

[0060] Step 104: Entering the overlap phase, controlling the actual oil pressure of the clutch according to the vehicle load and torque data, and completing the gear shift;

[0061] Step 105: Determine the pre-charge time compensation value for the next gear shift based on the actual clutch oil pressure and the preset required oil pressure.

[0062] In a possible implementation manner, in step 101, opening the solenoid valve to allow oil to flow into the clutch includes:

[0063] Entering the pre-charge stage, the solenoid valve is opened by applying a current pulse, allowing oil to flow into the clutch and generate oil pressure.

[0064] By controlling the opening of the solenoid valve through current pulses, a quick response to the clutch oil pressure can be achieved, which is essential for increasing shift speed and reducing shift delay. The application of current pulses can accurately control the opening degree of the solenoid valve, and then accurately control the amount of oil flowing into the clutch, ensuring accurate establishment of oil pressure.

[0065] Assume that a car is driving on a city road and the driver needs to shift from a low gear to a high gear to accelerate and overtake. In step 101, when the shift command is issued, the system will quickly enter the pre-charging stage. At this time, by applying a current pulse, the solenoid valve opens quickly, and the oil quickly flows into the clutch, quickly building up the required oil pressure. The rapid response of this process ensures that the shift can be completed quickly and smoothly, and the driver hardly feels any impact or delay, so that the overtaking action can be completed more safely and efficiently. At the same time, this fast and precise control also helps to reduce fuel waste caused by improper shifting and improve the fuel economy of the whole vehicle. In addition, due to the reduction of impact during the shifting process, the wear of the clutch will also be reduced accordingly, thereby reducing maintenance costs and extending the service life of the clutch.

[0066] In a possible implementation, in step 102, adjusting the current according to the clutch oil pressure monitored in real time to control the oil filling amount includes:

[0067] The clutch oil pressure is monitored in real time; when the clutch oil pressure reaches a preset pre-charge pressure value, the current passing through the solenoid valve is controlled according to a preset pre-charge current curve, so that the current is adjusted from a current pulse state to a pre-charge demand current to control the oil filling amount.

[0068] By monitoring the clutch oil pressure in real time and adjusting the current according to the preset pre-charge pressure value, the oil pressure can be accurately controlled to the required level to avoid excessive or low oil pressure. By controlling the current according to the preset pre-charge current curve, it can be smoothly adjusted from the current pulse state to the pre-charge demand current, which helps to optimize the oil filling process, reduce oil waste and system response time.

[0069] In step 102, the system monitors the clutch oil pressure in real time. When the oil pressure reaches the preset pre-charge pressure value, the system adjusts the current through the solenoid valve according to the preset pre-charge current curve. This means that the current is smoothly adjusted from the initial current pulse state to the pre-charge demand current to control the oil filling amount. Such control ensures the precise establishment of the clutch oil pressure, making the shifting process fast and smooth, and the driver hardly feels any impact. In addition, this precise control also helps to reduce fuel waste caused by improper oil pressure control and improve the fuel economy of the vehicle. At the same time, due to the reduction of oil pressure fluctuations and clutch wear, the maintenance cost of the clutch is reduced and the service life is extended.

[0070] In a possible implementation manner, in step 104, controlling the actual oil pressure of the clutch according to the vehicle load and torque data to complete the gear shift includes:

[0071] According to the monitored vehicle load and torque data, the oil pressure change curve required by the clutch in the overlapping stage is determined with reference to the preset pressure rise curve; the oil flow to the clutch is adjusted according to the oil pressure change curve to ensure that the actual oil pressure of the clutch changes according to the oil pressure change curve; the clutch is tightened by controlling the current of the solenoid valve; when the clutch is fully engaged and the actual oil pressure of the clutch is stabilized at the required level, the gear shift is completed.

[0072] Dynamically adjusting the oil pressure according to the vehicle load and torque data can reduce the impact and vibration during the gear shifting process and improve driving comfort. By accurately controlling the oil pressure change curve, the actual clutch oil pressure is ensured to match the required oil pressure, improving the accuracy of gear shifting. The clutch is tightened by controlling the current of the solenoid valve to ensure the continuity and efficiency of power transmission.

[0073] In step 104, the system monitors the vehicle load and torque data, and determines the oil pressure change curve required for the clutch in the overlap phase by referring to the preset pressure rise curve. The system adjusts the oil flow to the clutch according to this oil pressure change curve to ensure that the actual oil pressure of the clutch changes according to the predetermined curve. By controlling the current of the solenoid valve, the system realizes the clamping of the clutch. When the clutch is fully engaged and the actual oil pressure stabilizes at the required level, the shift is completed. For example, if the car is climbing a hill with a large load, the system will recognize that a higher oil pressure is required to ensure the smooth engagement of the clutch. The system adjusts the oil pressure change curve according to the load and torque data, and realizes this oil pressure change by controlling the current of the solenoid valve. In this way, even in the case of load changes, the smoothness and accuracy of the shift process can be ensured, and the shift failure or vehicle shaking caused by insufficient oil pressure can be avoided. This method of dynamically adjusting the oil pressure helps to improve driving comfort, reduce energy loss, improve fuel economy, and extend the service life of the clutch.

[0074] In a possible implementation manner, in step 105, determining the pre-charge time compensation value for the next gear shift by comparing the actual clutch oil pressure with the preset required oil pressure includes:

[0075] The pressure integral ratio at each time point is obtained based on the actual oil pressure of the clutch and the preset required oil pressure; the minimum value of all pressure integral ratios is compared with the preset threshold value; if the minimum value is less than the preset threshold value, the pre-charge time compensation value is determined for the next gear shift.

[0076] In a possible implementation manner, obtaining a pressure integral ratio at each time point according to the actual clutch oil pressure and the preset required oil pressure includes:

[0077] Monitor the actual oil pressure of the clutch in real time; integrate the actual oil pressure of the clutch with time to obtain the actual oil pressure integral; calculate the ratio of the actual oil pressure integral to the required pressure integral at each time point to obtain the pressure integral ratio at each time point; the required pressure integral is the integral of the oil pressure that changes with time and is pre-set based on the clutch properties and shifting requirements.

[0078] In a possible implementation manner, determining the pre-charging time compensation value for the next gear shift includes:

[0079] If the actual clutch oil pressure is lower than the required pressure, the pre-filling time compensation value that needs to extend the pre-filling time is calculated; if the actual clutch oil pressure is higher than the required pressure, the pre-filling time compensation value that needs to shorten the pre-filling time is calculated.

[0080] By calculating the pressure integral ratio and comparing the minimum value with the preset threshold, it can be determined whether the pre-charge time needs to be adjusted to optimize the shifting process. Dynamically adjusting the pre-charge time according to the difference between the actual oil pressure and the required oil pressure can reduce the delay in the shifting process and improve the shifting efficiency. By accurately controlling the pre-charge time, the shifting shock caused by oil pressure mismatch can be reduced and driving comfort can be improved.

[0081] In step 105, the system monitors the actual clutch oil pressure in real time and compares it with the preset required oil pressure. The system integrates the actual oil pressure with time to obtain the actual oil pressure integral, and calculates the ratio of the actual oil pressure integral to the required pressure integral at each time point, that is, the pressure integral ratio. If the minimum pressure integral ratio at a certain time point is found to be lower than the preset threshold, the system will determine the compensation value for extending the pre-filling time at the next gear shift. For example, if the system detects that the actual clutch oil pressure has been lower than the required pressure during a certain gear shift cycle, the system will calculate the pre-filling time compensation value that needs to be extended to ensure that the clutch oil pressure can reach the required pressure faster at the next gear shift to reduce the gear shift shock. On the contrary, if the actual oil pressure is higher than the required pressure, the system will calculate the pre-filling time compensation value that needs to be shortened to avoid gear shift delays caused by excessive oil pressure. This method of dynamically adjusting the pre-filling time helps to achieve smoother and more efficient gear shifts under different driving conditions, improving driving comfort and vehicle performance.

[0082] By improving the clutch oil filling control strategy of the gearbox, the smoothness and comfort of the gear shifting are improved. The gearbox shifting control method provided by the embodiment of the present application is described in detail below in conjunction with the accompanying drawings.

[0083] Figure 2 The pressure-time (Pt) diagram is shown to compare the pressure changes during the shifting process of the CVT transmission under the new control strategy (solid line) and the original control strategy (dashed line). The horizontal axis (t) represents time and shows the time series during the shifting process. The vertical axis (P) represents pressure and shows the pressure changes of the clutch during the shifting process. It includes the following stages:

[0084] 1. Pre-charging stage: At the beginning of the shift, the new control strategy quickly opens the solenoid valve by applying a large current pulse to quickly build up pressure. In the figure, the solid line rises rapidly. The original control strategy rises relatively slowly.

[0085] 2. Pressure maintenance stage: After the preset pressure is reached, the new control strategy drops the current to the normal pre-charge demand current and the pressure remains stable. In the figure, the solid line remains horizontal after reaching a certain height. The original control strategy has pressure fluctuations in this stage.

[0086] 3. OverLap stage: After the pre-charge stage, the new control strategy slowly reduces the current and enters the pressure holding stage to reduce pressure fluctuations. In the figure, the solid line slowly decreases after the pre-charge stage. The original control strategy has a large pressure drop in this stage, which may affect the smoothness of gear shifting.

[0087] 4. Rapid clamping stage: After the OverLap stage, the new control strategy will adjust the pressure rise curve according to the vehicle load and torque to achieve a smooth torque connection. In the figure, the solid line rises again after the OverLap stage. The original control strategy may have the problem of too fast or too slow pressure rise at this stage.

[0088] It can be seen that the new control strategy provided by the embodiment of the present application quickly builds up pressure in the pre-charging stage to reduce the delay during gear shifting; in the pressure holding stage, the current is slowly reduced to reduce pressure fluctuations; in the OverLap stage and the rapid compression stage, dynamic adjustment is performed to achieve smoother torque connection. It has obvious advantages in improving the comfort and responsiveness of the CVT transmission during gear shifting. In combination with the above stages, the control strategy for each stage is introduced:

[0089] Stage 1: Pulse oil filling during the clutch pre-filling stage.

[0090] Step 1: At the start of a gear shift, a large current pulse is applied during the clutch pre-charge phase to quickly open the solenoid valve. The purpose is to quickly build up the required oil pressure.

[0091] Step 2: Actual pressure detection: When the actual pressure reaches the preset pre-charge pressure value, the current will recover from the high current pulse state to the normal pre-charge demand current.

[0092] The second stage: dynamic adjustment of pre-charge flow.

[0093] Step 1: Pre-filling flow detection: During the pre-filling stage, the system will detect the actual filling oil flow in real time.

[0094] Step 2: Pre-charge time calculation: When the actual flow rate reaches the preset pre-charge flow rate, the pre-charge stage ends and the pre-charge time is calculated.

[0095] Phase 3: The current slowly decreases during the pressure maintenance phase.

[0096] After the pre-charge phase, the current will slowly decrease to the required current during the pressure maintenance phase. This slow decrease helps reduce pressure fluctuations caused by the solenoid valve closing too quickly.

[0097] Stage 4: Pressure rise curve in the OverLap stage.

[0098] In the OverLap stage, the pressure rise curve is obtained by looking up the table according to the load and torque of the vehicle. This stage is to ensure that the clutch can be smoothly engaged during the gear shifting process.

[0099] Phase 5: Calculation of the ratio of actual pressure to required pressure.

[0100] Step 1: Ratio calculation: In the OverLap and fast compression stages, calculate the ratio of the actual pressure integral to the required pressure integral.

[0101] The actual pressure integral refers to the integral of the actual clutch oil pressure changing over time during the shifting process. The actual pressure integral is calculated by monitoring the oil pressure in real time through the oil pressure sensor and integrating the oil pressure value with time. This integral reflects the actual oil pressure change that the clutch is subjected to during the shifting process. The demand pressure integral refers to the integral of the ideal oil pressure that is preset according to the design of the clutch and the shifting requirements. The demand pressure integral is the ideal oil pressure change curve calculated based on the working characteristics of the clutch and the shifting strategy. The system calculates the ratio of the actual pressure integral to the demand pressure integral. This ratio is used to evaluate the degree of match between the actual oil pressure and the ideal oil pressure. If the ratio deviates from 1, it means that there is a deviation between the actual oil pressure and the demand oil pressure.

[0102] Step 2: Minimum value detection: If the minimum value of this ratio is less than the set threshold, the system will compensate the oil filling time to adapt to different working conditions.

[0103] If the minimum value of the ratio is less than the set threshold, the system will compensate intelligently. This may involve adjusting the pre-fill time to optimize the smoothness of the gear shift. For example, if the actual pressure is lower than the required pressure, the system may extend the pre-fill time to ensure that the clutch has sufficient oil pressure; if the actual pressure is higher than the required pressure, the system may shorten the pre-fill time to avoid excessive oil pressure.

[0104] Figure 3 The schematic diagram of the implementation steps of the new control strategy is described in detail, including starting gear shifting, clutch pre-charging, pressure and flow detection, determination of pre-charging time, current adjustment in the pressure holding stage, calculation of the pressure rise curve in the OverLap stage, and compensation of the oil filling time according to the ratio.

[0105] Step 1: During the gear shift process, the clutch needs to be pre-filled with oil in preparation for engagement. At this time, the system will apply a large current pulse to quickly open the solenoid valve to quickly build up the required oil pressure.

[0106] Step 2: The system will detect whether the actual pressure reaches the preset value. If the actual pressure reaches the preset value (marked as "Y"), proceed to the next step; if it does not (marked as "N"), the pre-charge strategy needs to be adjusted.

[0107] Step 3: Once the actual pressure reaches the preset value, the clutch pre-charge current will drop to the normal pre-charge demand current.

[0108] Step 4: The system detects whether the actual pre-charge flow rate reaches the preset flow rate. If it reaches (marked as "Y"), proceed to the next step; if it does not reach, the pre-charge flow rate needs to be adjusted.

[0109] Step 5: When the actual pre-charge flow reaches the preset flow, the system will determine the pre-charge time.

[0110] Step 6: After the pre-charging stage, the clutch pre-charging ends and the current slowly decreases to the required current of the pressure holding stage to reduce pressure fluctuations.

[0111] Step 7: In the OverLap stage, the pressure rise curve is obtained by looking up the table according to the vehicle load and torque.

[0112] Step 8: Calculate the ratio of the actual pressure integral during OverLap and subsequent phases divided by the demand pressure integral.

[0113] Step 9: Check whether the minimum value of this ratio is less than the set threshold. If it is (marked as "Y"), the pre-filling time needs to be compensated; if not (marked as "N"), the process ends and the intelligent control of clutch oil filling during the gear shifting process is completed.

[0114] This flowchart shows a closed-loop control system that ensures that the oil filling pressure and flow of the clutch of the CVT transmission can meet the dynamic changes during the gear shift process through real-time monitoring and adjustment, thereby improving the smoothness and comfort of the gear shift. This method can effectively solve the gear shift intrusion problem caused by insufficient oil filling pressure or pressure fluctuation, and improve the driving experience.

[0115] By applying a large current pulse during the clutch pre-filling stage and slowly reducing the current after the pre-filling is completed, the pressure fluctuation is effectively reduced. At the same time, by dynamically adjusting the pre-filling time and adjusting the pressure rise curve according to the vehicle load and torque, intelligent control of clutch oil filling under different working conditions is achieved, thereby improving the shifting comfort of the CVT transmission.

[0116] In summary, the embodiment of the present application provides a gearbox shift control method. By adjusting the current according to the real-time monitored clutch oil pressure, the oil filling amount can be accurately controlled to ensure that the clutch has sufficient oil supply during the shifting process, avoiding unsmooth shifting due to insufficient oil. When the oil filling amount reaches the preset value and the pre-filling time is over, the current is controlled to the set pressure to maintain the required current, which can ensure that the clutch has a stable oil pressure during the shifting process and reduce the impact during the shifting process. In the overlapping stage, the actual clutch oil pressure is controlled according to the vehicle load and torque data to complete the shifting, which can ensure the smoothness of the shifting process and avoid shifting failure or vehicle shaking caused by improper oil pressure control. By comparing the actual clutch oil pressure with the preset required oil pressure, the pre-filling time compensation value for the next shift is determined, which can further optimize the shifting strategy and reduce the shifting delay or impact caused by improper pre-filling time setting.

[0117] Based on the same technical concept, the embodiment of the present application also provides a transmission shift control system, such as Figure 4 As shown, the system comprises:

[0118] The opening module 401 is used to open the solenoid valve in response to the shift command, so that the oil flows into the clutch;

[0119] The oil filling amount control module 402 is used to adjust the current according to the clutch oil pressure monitored in real time to control the oil filling amount;

[0120] The current control module 403 is used to control the current to a set pressure to maintain the required current when the oil filling amount reaches a preset value and the pre-filling time ends;

[0121] Overlap module 404, used to enter the overlap phase, control the actual oil pressure of the clutch according to the vehicle load and torque data, and complete the gear shift;

[0122] The compensation value calculation module 405 is used to determine the pre-charge time compensation value for the next gear shift according to the actual clutch oil pressure and the preset required oil pressure.

[0123] The present application also provides an electronic device corresponding to the method provided in the above embodiment. Figure 5 , which shows an electronic device diagram provided by some embodiments of the present application. The electronic device 20 may include: a processor 200, a memory 201, a bus 202 and a communication interface 203, wherein the processor 200, the communication interface 203 and the memory 201 are connected via the bus 202; the memory 201 stores a computer program that can be run on the processor 200, and the processor 200 executes the method provided by any of the aforementioned embodiments of the present application when running the computer program.

[0124] The memory 201 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk memory. The communication connection between the system network element and at least one other network element is realized through at least one physical port (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used.

[0125] The bus 202 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory 201 is used to store programs, and the processor 200 executes the programs after receiving execution instructions. The method disclosed in any implementation of the aforementioned embodiment of the present application may be applied to the processor 200, or implemented by the processor 200.

[0126] The processor 200 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 200. The above processor 200 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a readily available programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application can be directly embodied as a hardware decoding processor to be executed, or the hardware and software modules in the decoding processor can be executed. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 201, and the processor 200 reads the information in the memory 201 and completes the steps of the above method in combination with its hardware.

[0127] The electronic device provided in the embodiment of the present application and the method provided in the embodiment of the present application are based on the same inventive concept and have the same beneficial effects as the method adopted, operated or implemented by them.

[0128] The present application also provides a computer-readable storage medium corresponding to the method provided in the above embodiment. Figure 6The computer-readable storage medium shown is a CD 30 on which a computer program (ie, a program product) is stored. When the computer program is run by a processor, the method provided in any of the aforementioned embodiments is executed.

[0129] It should be noted that examples of the computer-readable storage medium may also include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other optical or magnetic storage media, which are not listed here one by one.

[0130] The computer-readable storage medium provided in the above-mentioned embodiments of the present application and the method provided in the embodiments of the present application are based on the same inventive concept and have the same beneficial effects as the method adopted, run or implemented by the application program stored therein.

[0131] It should be noted that the above embodiments illustrate the present application rather than limit the present application, and that those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be constructed as a limitation to the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of multiple such elements. The present application may be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In a unit claim that lists several devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

[0132] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

[0133] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A gearbox shift control method, characterized in that: The method comprises: In response to a shift command, the solenoid valve is opened to allow oil to flow into the clutch; The current is adjusted according to the real-time monitored clutch oil pressure to control the oil filling amount; When the oil filling amount reaches a preset value and the pre-filling time ends, the current is controlled to a set pressure to maintain the required current; Entering the overlap phase, the actual clutch oil pressure is controlled according to the vehicle load and torque data to complete the gear shift; The pre-charge time compensation value for the next gear shift is determined by the actual clutch oil pressure and the preset required oil pressure.

2. The method according to claim 1, characterized in that The current is adjusted according to the clutch oil pressure monitored in real time to control the oil filling amount, including: Real-time monitoring of clutch oil pressure; When the clutch oil pressure reaches a preset pre-charge pressure value, the current passing through the solenoid valve is controlled according to a preset pre-charge current curve, so that the current is adjusted from a current pulse state to a pre-charge demand current to control the oil filling amount.

3. The method according to claim 1, characterized in that The actual clutch oil pressure is controlled according to the vehicle load and torque data to complete the gear shift, including: According to the monitored vehicle load and torque data, with reference to a preset pressure rise curve, the oil pressure change curve required by the clutch in the overlap stage is determined; adjusting the oil flow to the clutch according to the oil pressure change curve to ensure that the actual oil pressure of the clutch changes according to the oil pressure change curve; The clutch is tightened by controlling the current of the solenoid valve; When the clutch is fully engaged and the actual clutch oil pressure stabilizes at the required level, the gear shift is completed.

4. The method according to claim 1, characterized in that The determining of the pre-charge time compensation value for the next gear shift by using the actual clutch oil pressure and the preset required oil pressure includes: Obtaining a pressure integral ratio at each time point according to the actual clutch oil pressure and the preset required oil pressure; comparing the minimum value of all pressure integral ratios with a preset threshold; If the minimum value is less than the preset threshold, a pre-charge time compensation value is determined for the next gear shift.

5. The method according to claim 4, characterized in that The pressure integral ratio at each time point is obtained according to the actual clutch oil pressure and the preset required oil pressure, including: Real-time monitoring of actual clutch oil pressure; Integrating the actual oil pressure of the clutch and time to obtain an actual oil pressure integral; The ratio of the actual oil pressure integral to the required pressure integral at each time point is calculated to obtain the pressure integral ratio at each time point; the required pressure integral is the integral of the oil pressure changing with time that is preset according to the clutch properties and the shifting requirements.

6. The method according to claim 5, characterized in that The determining of the pre-charging time compensation value for the next gear shift includes: If the actual oil pressure of the clutch is lower than the required pressure, a pre-filling time compensation value is calculated to extend the pre-filling time; If the actual oil pressure of the clutch is higher than the required pressure, a pre-filling time compensation value for shortening the pre-filling time is calculated.

7. The method according to claim 1, characterized in that The step of opening the solenoid valve to allow the oil to flow into the clutch comprises: Entering the pre-charge stage, the solenoid valve is opened by applying a current pulse, allowing oil to flow into the clutch and generate oil pressure.

8. A gearbox shift control system, characterized in that: The system comprises: An opening module, for opening the solenoid valve in response to a shift command, so that oil flows into the clutch; An oil filling quantity control module, used to adjust the current according to the clutch oil pressure monitored in real time to control the oil filling quantity; A current control module, used for controlling the current to a set pressure to maintain the required current when the oil filling amount reaches a preset value and the pre-filling time ends; Overlap module, used to enter the overlap phase, control the actual clutch oil pressure according to the vehicle load and torque data, and complete the gear shift; The compensation value calculation module is used to determine the pre-charge time compensation value for the next gear shift according to the actual oil pressure of the clutch and the preset required oil pressure.

9. An electronic device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: Computer-readable instructions are stored thereon, and the computer-readable instructions can be executed by a processor to implement the method according to any one of claims 1-7.

Images