Wet clutch half-engagement point adaptive method, system, vehicle, and storage medium

Abstract

The application relates to a wet clutch half-engagement point adaptive method, a system, a vehicle and a storage medium, which comprises the following steps: S1, determining whether a non-torque clutch enters a clutch basic half-engagement point learning, if yes, entering S2, otherwise, executing S1; S2, clutch basic half-engagement point learning; S3, determining whether to enter clutch torque half-engagement point self-adaption, if yes, executing S4, otherwise, executing S1; S4, clutch torque half-engagement point self-adaption; S5, determining whether a current clutch target half-engagement point torque value has reached a set threshold, if yes, ending, otherwise, executing S6; S6, determining whether to enter clutch pressure following self-adaption, if yes, executing S7, otherwise, executing S1; S7, clutch pressure following self-adaption; S8, confirming whether a clutch half-engagement point target pressure meets the requirements of clutch pressure and torque control at the same time, if yes, ending, otherwise, executing S3. The application improves the oil filling and pressure following control precision of the clutch.

Description

Technical Field

[0001] This invention relates to the field of wet dual-clutch automatic transmission technology, specifically to a wet clutch half-engagement point adaptive method, system, vehicle, and storage medium. Background Technology

[0002] The clutch decoupling point in a wet dual-clutch transmission is crucial for vehicle crawling, starting, and shifting control. An inappropriate clutch decoupling point can lead to severe vehicle shocks, significantly impacting ride comfort. During the use of a wet dual-clutch transmission, frequent clutch engagement and disengagement, along with high-temperature friction, cause accumulated mechanical wear. This wear not only alters the clutch piston stroke but also changes the friction characteristics of the friction plates. Different driving conditions and habits can produce varying results, potentially increasing or decreasing the coefficient of friction. Therefore, timely and effective pressure and torque adaptation at the clutch decoupling point throughout its lifespan is essential.

[0003] Currently, there are two main types of adaptive methods for the partial engagement point of wet clutches:

[0004] The first method is adaptive learning based on the actual pressure response of the target clutch after oil filling. This is achieved in two main steps: first, filling the target clutch with oil; second, controlling the target clutch pressure to increase in a set step size, and adapting the semi-engagement point based on the actual clutch pressure response. For example, patent document CN105822692A discloses a self-learning method for the semi-engagement point of a dual-clutch transmission, which adapts by judging the rate of change of the actual clutch pressure. Another example is patent document CN113757357A, which discloses a self-learning method for oil filling and semi-engagement point of a dual-clutch automatic transmission, which adapts by judging the pressure difference between the target and actual clutch pressure. The shortcomings of these two methods are: 1) They cannot adapt to differences and changes in the friction coefficient, thus failing to guarantee the appropriate torque transmission during oil filling and low-pressure following control, and the low-speed driving performance and consistency between different vehicles and throughout the clutch's lifespan cannot be guaranteed; 2) Due to manufacturing and installation errors and performance degradation during the lifespan, the response consistency of the wet dual-clutch hydraulic system is difficult to guarantee, and the accuracy and consistency of the semi-engagement adaptation will also be affected.

[0005] The second method is to adapt based on the torque transmitted after the target clutch has been filled with oil. For example, patent document CN112443655A discloses a clutch half-engagement point adaptive method, device, control equipment, and storage medium, which adapts the half-engagement point based on the difference in the rate of change of the speed difference between the input and output ends before and after clutch filling. Another example is patent document CN113685457B, which discloses a dual-clutch transmission clutch half-engagement point pressure adaptive method and system, which adapts by calculating the clutch half-engagement point torque based on the shifting force during synchronizer shifting after the target clutch has been filled with oil. The shortcomings of these two methods are: 1) For situations with large differences in friction coefficients, they cannot account for changes in the half-engagement point caused by piston stroke variations, potentially leading to severe pressure following problems and a "bulging" phenomenon; 2) They cannot adapt to wet dual-clutch hydraulic systems, resulting in poor clutch filling and pressure following performance.

[0006] Therefore, it is necessary to develop a new adaptive method, system, vehicle, and storage medium for wet clutch half-engagement point. Summary of the Invention

[0007] The purpose of this invention is to provide a wet clutch semi-engagement point adaptive method, system, vehicle, and storage medium that can improve the accuracy of clutch oil filling and pressure following control.

[0008] In a first aspect, the wet dual-clutch half-engagement point adaptive method of the present invention includes the following steps:

[0009] S1: Determine whether the non-torque transmission clutch has entered the clutch basic half-engagement point learning. If yes, proceed to step S2; otherwise, execute step S1.

[0010] S2: Learning about the basic clutch semi-engagement point;

[0011] S3: Determine whether the clutch torque half-engagement point adaptive has been entered. If yes, proceed to step S4; otherwise, proceed to step S1.

[0012] S4: Clutch torque half-engagement point adaptive;

[0013] S5: Determine whether the current clutch target half-engagement point torque value has reached the set threshold. If yes, the clutch half-engagement point adaptive adjustment ends. If no, proceed to step S6.

[0014] S6: Determine if the clutch pressure follows the adaptive input. If yes, proceed to step S7; otherwise, proceed to step S1.

[0015] S7: Clutch pressure adaptive follow;

[0016] S8: Confirm whether the target pressure at the clutch half-engagement point simultaneously meets the requirements of clutch pressure and torque control. If yes, the clutch half-engagement point adaptive operation ends; otherwise, proceed to step S3.

[0017] In step S1, when all of the following conditions are met, it is considered that the non-torque transmission clutch has entered the clutch basic half-engagement point learning.

[0018] (1) The vehicle is driving stably in the preset gear;

[0019] (2) The transmission fluid temperature is within the preset temperature range;

[0020] (3) The driver did not apply the brakes;

[0021] (4) The throttle is greater than the minimum throttle threshold, and the throttle change rate is less than the throttle change rate threshold;

[0022] (5) The engine speed is within the preset speed threshold range;

[0023] (6) The non-torque transmission clutch does not complete the half-engagement point self-adaptation.

[0024] Optionally, step S2 includes the following steps:

[0025] S21. Request all gears on the input shaft where the non-torque transmission clutch is located, and determine whether all shift fork positions on the input shaft are within the set displacement threshold range. If so, proceed to step S22.

[0026] S22, Learn the average pressure change rate of the clutch;

[0027] S23. Learn the initial value of the clutch's basic half-engagement point;

[0028] S24. Calculate the basic half-engagement point of the clutch.

[0029] Optionally, step S22 includes the following steps:

[0030] S22-1, Control the non-torque clutch to the set target current TC prefill Pre-filling with oil is performed, when the pre-filling time T prefill Greater than the set pre-filling time threshold t prefill When the time comes, proceed to step S22-2;

[0031] S22-2, Control the current of the non-torsion clutch solenoid valve in a set current step. c Ascending, during this process, when the actual clutch pressure exceeds the set minimum pressure threshold TP min When the actual clutch pressure exceeds the set maximum pressure threshold TP, the maximum pressure change rate of the clutch is calculated. maxAt that time, record the current maximum clutch pressure change rate Grad max Proceed to step S22-3;

[0032] S22-3, The target current of the control non-torque transmission clutch solenoid valve is 0, when the clutch oil discharge time T drain The clutch oil release time threshold t is greater than the set value. drain When the time comes, proceed to step S22-4;

[0033] S22-4, Calculate the clutch mean pressure change rate Grad avg ;

[0034] S22-5. Determine if the average pressure change rate of the clutch is 0. If yes, return to step S22-1; otherwise, proceed to step S23.

[0035] Optionally, step S23 includes the following steps:

[0036] S23-1, Control the non-torque clutch to the set target current TC prefill Pre-filling with oil is performed, when the pre-filling time T prefill Greater than the set pre-filling time threshold t prefill When the time comes, proceed to step S23-2;

[0037] S23-2, Control the current of the non-torsion clutch solenoid valve in a set current step size. c Increment the clutch pressure and calculate the actual clutch pressure change rate Grad; when the actual clutch pressure change rate Grad is greater than the clutch average pressure change rate Grad... avg At that time, the current actual clutch pressure is recorded as the initial value VKP at the clutch base half-engagement point. init and proceed to step S23-3;

[0038] S23-3, Control the target current of the non-torque transmission clutch solenoid valve to be 0; when the clutch oil discharge time T drain The clutch oil release time threshold t is greater than the set value. drain At that time, proceed to step S24.

[0039] Optionally, step S24 includes the following steps:

[0040] S24-1. Based on the transmission oil temperature and the clutch half-engagement point temperature compensation curve stored in the controller, calculate the clutch half-engagement point temperature compensation value CP by referring to the table. temp ;

[0041] S24-2, Calculate the clutch basic half-engagement point VKP: VKP = VKP init +CP tempThe clutch basic half-engagement point learning is complete, marked by position 1. The clutch basic half-engagement point learning is finished.

[0042] Optionally, step S4 includes the following steps:

[0043] S41, Request to engage the target gear.

[0044] S42, Clutch torque half-engagement point oil filling control;

[0045] S43, learning the torque at the clutch half-engagement point.

[0046] Optionally, step S41 includes the following steps:

[0047] S41-1. Based on the vehicle's current driving gear, set the clutch torque half-engagement point to adaptively target the gear and issue a gear engagement request;

[0048] S41-2. Determine whether the target gear is successfully engaged. If yes, proceed to step S42; otherwise, proceed to step S41-1.

[0049] Optionally, step S42 includes the following steps:

[0050] S42-1, Calculate the clutch torque half-engagement point target pressure TKP fill ;

[0051] S42-2, Control the non-torque clutch to achieve the target pressure TKP at the clutch torque half-engagement point. fill The clutch is filled with oil to meet the target pressure, and the clutch torque half-engagement point adaptive oil filling timer is triggered simultaneously.

[0052] S42-3, Determining the adaptive oil filling time T for clutch torque half-engagement fill Is it greater than the set oil filling time threshold t? fill If yes, proceed to step S43; otherwise, proceed to step S42-2.

[0053] Optionally, step S42-1 specifically includes:

[0054] Select the clutch base engagement point VKP and the currently applied clutch engagement point KP. old The larger value in the equation is used as the adaptive initial value TKP for the clutch torque half-engagement point. init ;

[0055] Adaptive step size based on the set clutch torque half-engagement point. tkp Number of times N is adaptive to the clutch torque half-engagement point tkp Clutch torque half-engagement point adaptive direction D tkp Calculate the clutch torque half-engagement point target pressure TKPfill Among them, TKP fill =TKP init +Step tkp ×N tkp ×D tkp .

[0056] Optionally, step S43 includes the following steps:

[0057] S43-1, Request torque half-engagement point adaptive target gear TG tkp Return to neutral, triggering the gear return timer;

[0058] S43-2. ​​Determine whether the target gear shift fork displacement signal has reached the set shift fork displacement threshold range. If yes, proceed to step S43-3; otherwise, wait for the shift fork to return to neutral and continue to determine.

[0059] S43-3. Determine whether the speed difference between the input and output ends of the non-torque transmission clutch is less than the set first output speed difference threshold. If yes, execute S43-4; otherwise, wait and continue to determine.

[0060] S43-4. Record the current clutch output speed value as the clutch first output speed OutSpd1, and simultaneously trigger the half-engagement point torque learning timer.

[0061] S43-5. Determine whether the speed difference between the input and output ends of the non-torque transmission clutch is less than the set second output speed difference threshold. If yes, proceed to step S43-6; otherwise, wait and continue to determine.

[0062] S43-6. Record the current clutch output speed as the second output speed of the clutch, OutSpd2, and simultaneously record the current value of the half-engagement torque learning timer as the half-engagement torque learning time, T. tkp ;

[0063] S43-7. Calculate the key parameters for adaptive clutch torque half-engagement point, including the initial value of clutch half-engagement point torque Torq. tkp Number of times N is adaptive to the clutch torque half-engagement point tkp Adaptive direction D of clutch torque half-engagement point tkp ;

[0064] S43-8. Determine whether the clutch half-engagement point torque learning timer is less than the set clutch half-engagement point torque learning time threshold. If not, proceed to step S43-9; if yes, proceed to step S43-11.

[0065] S43-9 Determining the initial value of the clutch half-engagement torque Torq tkpIs it greater than 0? If yes, proceed to step S43-10; otherwise, proceed to step S43-2.

[0066] S43-10. Calculate the torque and pressure at the clutch half-engagement point;

[0067] S43-11, Calculate the adaptive flag for the clutch half-engagement point: When the initial value of the clutch half-engagement point torque is Torq... tkp Torq, greater than the maximum torque value at the clutch half-engagement point max Or, when Torq tkp The torque value Torq is greater than 0 and less than the minimum torque value at the clutch half-engagement point. min When the clutch half-engagement point adaptive flag is set to 1, the clutch half-engagement point adaptive flag is set to 0.

[0068] S43-12, Control the target current of the non-torque transmission clutch solenoid valve to be 0; when the clutch oil discharge time T drain The clutch oil release time threshold t is greater than the set value. drain At that time, proceed to step S5.

[0069] Optionally, step S43-10 includes:

[0070] When either condition A or condition B is met, the initial value of the clutch half-engagement torque Torq from the previous calculation is taken. tkp_z Torq, the torque at the clutch half-engagement point bp Torq bp =Torq tkp_z Clutch half-engagement point pressure bp Take the oil filling pressure TKP from the last adaptive test. fill_z That is: Press bp =TKP fill_z When neither condition A nor condition B is met, the clutch half-engagement point torque and pressure remain unchanged.

[0071] Condition A: Adaptive direction of clutch torque half-engagement point D tkp ≠-1, initial value of clutch half-engagement torque Torq tkp The maximum torque value Torq at the set clutch half-engagement point is greater than the specified value. max ;

[0072] Condition B: Adaptive direction of clutch torque half-engagement point D tkp =-1, initial value of clutch half-engagement torque Torq tkp The torque value Torq is less than the set minimum torque value at the clutch half-engagement point. min .

[0073] Optionally, step S7, based on the torque half-engagement point adaptation, further pressure following adaptation includes the following steps:

[0074] S71, Control the non-torque clutch to the target pressure TKP at the clutch torque half-engagement point. fill During the oil filling process, when the clutch oil filling time T... fowlling Greater than the set oil filling time threshold t fowlling At that time, execute S72;

[0075] S72, Control the target pressure of the non-torque clutch in a set pressure step. p Increase the pressure and calculate the maximum pressure difference ΔP between the clutch target pressure and the actual pressure. max When the clutch target pressure exceeds the set pressure follower adaptive maximum pressure threshold FP max When the time comes, proceed to step S73;

[0076] S73. Calculate the torque and pressure at the clutch half-engagement point;

[0077] S74. Calculate the adaptive flag for the clutch half-engagement point;

[0078] S75, the target current of the non-torque transmission clutch solenoid valve is 0, when the clutch oil discharge time T drain The clutch oil release time threshold t is greater than the set value. drain At that time, the clutch pressure adaptively ends.

[0079] Optionally, step S73 specifically includes:

[0080] When ΔP max When the pressure is less than the set adaptive differential pressure threshold, the initial value of the current clutch half-engagement torque, Torq, is recorded. tkp Torq is the torque value at the clutch half-engagement point. bp Record the current clutch torque half-engagement point target pressure TKP fill Press at the clutch half-engagement point bp In other cases, Torq bp and Press bp It remains unchanged.

[0081] Optionally, step S74 specifically includes:

[0082] When ΔP max If the pressure is less than the set adaptive differential pressure threshold, the clutch half-engagement point adaptive flag will be set to 1; otherwise, the clutch half-engagement point adaptive flag will remain at 0.

[0083] Secondly, the wet dual-clutch half-engagement point adaptive system of the present invention includes a controller and a memory, wherein the memory stores a computer-readable program, and the computer-readable program, when invoked by the controller, can execute the steps of the wet dual-clutch half-engagement point adaptive method of the present invention.

[0084] Thirdly, the vehicle described in this invention employs a wet dual-clutch half-engagement point adaptive system as described in this invention.

[0085] Fourthly, the present invention provides a storage medium storing a computer-readable program that, when invoked, can execute the steps of the wet dual-clutch half-engagement point adaptive method as described in the present invention.

[0086] The present invention has the following advantages:

[0087] (1) This invention can flexibly adapt to the hardware characteristics of wet clutches, solenoid valves and TCUs, and is easy to be ported to various wet clutch systems, greatly reducing the software development and calibration work caused by hardware system upgrades and changes.

[0088] (2) The present invention has achieved a perfect dual adaptation to the characteristics of hydraulic system and clutch friction characteristics, and combined with the actual application requirements of the whole vehicle, it has greatly improved the consistency of driving performance of mass-produced vehicles and the whole vehicle throughout its life, which is conducive to improving the customer's driving experience.

[0089] (3) The present invention can adapt to the clutch volume half engagement point and wet dual-clutch hydraulic system, improve the clutch filling and pressure following control accuracy, and at the same time ensure that the clutch transmits appropriate torque at the half engagement point, thereby improving driving comfort and consistency between different vehicles and during the life of wet clutch. Attached Figure Description

[0090] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0091] Figure 1 This is a flowchart of a wet clutch half-engagement point adaptive method according to an embodiment of the present invention;

[0092] Figure 2 This is a flowchart illustrating the learning process for the basic half-engagement point of a wet clutch according to an embodiment of the present invention.

[0093] Figure 3This is a flowchart illustrating the adaptive torque half-engagement point of a wet clutch according to an embodiment of the present invention.

[0094] Figure 4 This is a flowchart illustrating the wet clutch pressure following adaptive operation according to an embodiment of the present invention.

[0095] Figure 5 This is a schematic diagram of the wet clutch half-engagement point adaptive process according to an embodiment of the present invention;

[0096] Figure 6 This is an adaptive curve diagram of the wet clutch half-engagement point according to an embodiment of the present invention. Detailed Implementation

[0097] The present invention will now be described in detail with reference to the accompanying drawings.

[0098] In this embodiment, the adaptive half-engagement point of the wet clutch is divided into three stages: The first stage is basic clutch half-engagement point learning, which initially adapts to the characteristics of the wet dual-clutch hydraulic system and the clutch volume half-engagement point; the second stage is clutch torque half-engagement point adaptation, which, based on the basic half-engagement point, adapts to the friction characteristics of the friction plates, controlling the half-engagement point torque within an appropriate range; the third stage is clutch pressure following adaptation, which, based on the torque half-engagement point, further improves the accuracy of clutch oil filling and pressure following control. Basic clutch half-engagement point learning is the foundation of adaptation. The clutch torque half-engagement point adaptation and clutch pressure following adaptation stages can be repeated alternately until the optimal clutch half-engagement point is found. In specific implementation, if the adaptation process exits midway due to unmet driving conditions, it can resume from the previously exited stage when the conditions are met again, rather than always starting from the first stage.

[0099] like Figure 1 As shown in this embodiment, a wet dual-clutch half-engagement point adaptive method includes the following steps:

[0100] S1: Determine the learning process for the non-torque transmission clutch to enter the basic half-engagement point;

[0101] The criteria for determining whether a non-torsion clutch is entering the basic half-engagement point learning stage include:

[0102] (1) The vehicle is driving stably in a preset gear; in this embodiment, the preset gear is 4 / 5 / 6.

[0103] (2) The transmission oil temperature is within the preset oil temperature range. Considering the viscosity-temperature characteristics of the oil and the range of oil temperature used in actual applications, in this embodiment, the preset oil temperature range is set to 60℃~90℃.

[0104] (3) The driver did not apply the brakes.

[0105] (4) The throttle is greater than the minimum throttle threshold, and the throttle change rate is less than the throttle change rate threshold. In this embodiment, the minimum throttle threshold is set to 5%, and the throttle change rate threshold is set to 10%.

[0106] (5) The engine speed is within the preset speed threshold range. In this embodiment, the engine speed threshold range is set to 1500rpm~3000rpm.

[0107] (6) The non-torque transmission clutch did not complete the half-engagement point adaptation. In one driving cycle, the clutch can complete the half-engagement point adaptation at most once.

[0108] S2: Learning about the basic clutch semi-engagement point;

[0109] See Figure 2 The document details the specific process for learning the basic clutch engagement point, including the following steps:

[0110] S21. Request the return to all gears on the input shaft where the non-torque transmission clutch is located to avoid the impact of clutch engagement on the vehicle's movement. Determine whether all shift fork positions on this input shaft are within the set displacement threshold range. If so, proceed to step S22.

[0111] S22, Learn the average pressure change rate of the clutch.

[0112] This step involves adaptive learning tailored to the characteristics of wet dual-clutch hydraulic systems to improve consistency between production prototypes and the learning of the basic half-engagement point throughout the wet dual-clutch lifespan. To enhance accuracy, the average of two learning iterations is taken. The specific steps include:

[0113] S22-1, Control the non-torque clutch to the set target current TC prefill Pre-filling with oil is performed, when the pre-filling time T prefill Greater than the set pre-filling time threshold t prefill At that time, proceed to step S22-2.

[0114] In this embodiment, the target current TC prefill The target clutch pressure-current characteristic curve and the minimum design value of the clutch return spring preload are used for calculation from a table. The target oil filling current threshold TC is also calculated. prefill The current is 300mA. The pre-filling time threshold t... prefill Set to 500ms.

[0115] S22-2, Control the current of the non-torsion clutch solenoid valve in a set current step. cAscending, during this process, when the actual clutch pressure exceeds the set minimum pressure threshold TP min When the actual clutch pressure exceeds the set maximum pressure threshold TP, the maximum pressure change rate of the clutch is calculated. max At that time, record the current maximum clutch pressure change rate Grad max Proceed to step S22-3;

[0116] In this step, the current step size Step c It is obtained from bench testing and stored in the TCU unit, and is the result of the interaction between the hydraulic system and the clutch system. In this embodiment, the current step size Step c The minimum pressure threshold TP is set to 15mA. min and maximum pressure threshold TP max A pressure value is set at which the clutch is designed to be partially engaged or more engaged, in order to eliminate interference from clutch oil filling on the hydraulic system response. In this embodiment, the minimum pressure threshold is 4 bar, and the maximum pressure threshold is 5 bar.

[0117] S22-3, Control the target current of the non-torque transmission clutch solenoid valve to be 0. When the clutch oil discharge time T drain The clutch oil release time threshold t is greater than the set value. drain At that time, proceed to step S22-4.

[0118] Here, the clutch oil drain time threshold t drain The data obtained from bench testing is stored in the TCU unit and set to 300ms.

[0119] S22-4, Calculate the clutch mean pressure change rate Grad avg The clutch average pressure change rate Grad avg This refers to the arithmetic mean of the maximum pressure change rates Grad1 and Grad2 during the two learning processes after repeating steps S22-1 to S22-3, which improves the learning accuracy.

[0120] In this embodiment, the clutch mean pressure change rate Grad is calculated. avg Specifically:

[0121] A. Determine if the first pressure change rate is 0. If yes, record the current maximum pressure change rate of the clutch as the first pressure change rate Grad1 and execute step S22-5. If no, execute step B.

[0122] B. Record the current maximum clutch pressure change rate as the second pressure change rate Grad2, and calculate the clutch average pressure change rate Grad. avg = (Grad1 + Grad2) / 2.

[0123] S22-5. Determine if the average pressure change rate of the clutch is 0. If yes, return to step S22-1; otherwise, proceed to step S23.

[0124] S23. Learn the initial value of the basic clutch half-engagement point, which includes the following steps:

[0125] S23-1, Control the non-torque clutch to the set target current TC prefill Pre-filling with oil is performed, when the pre-filling time T prefill Greater than the set pre-filling time threshold t prefill When the time comes, proceed to step S23-2;

[0126] S23-2, Control the current of the non-torsion clutch solenoid valve in a set current step size. c Increment and calculate the actual clutch pressure change rate Grad. When the actual clutch pressure change rate Grad is greater than the average clutch pressure change rate Grad... avg At that time, the current actual clutch pressure is recorded as the initial value VKP at the clutch base half-engagement point. init and proceed to step S23-3;

[0127] S23-3, The target current of the non-torque transmission clutch solenoid valve is 0. When the clutch oil discharge time T drain The clutch oil release time threshold t is greater than the set value. drain At that time, proceed to step S24.

[0128] S24. Calculate the basic half-engagement point of the clutch, including the following steps:

[0129] S24-1. Based on the transmission oil temperature and the clutch half-engagement point temperature compensation curve stored in the controller, calculate the clutch half-engagement point temperature compensation value CP by referring to the table. temp .

[0130] The clutch half-engagement point temperature compensation curve was obtained through bench testing and stored in the TCU. The specific test included the following steps:

[0131] (1) Learn the basic half-engagement point of the clutch under different transmission oil temperatures and obtain the initial value of the basic half-engagement point;

[0132] (2) Using the initial value of the base half-junction point obtained at the set temperature as the reference point, calculate and record the difference between the initial value of the base half-junction point at other temperatures and the reference point;

[0133] (3) The above test was repeated for 100 transmissions from different batches, and the average value of the test results was stored in the TCU as the final test result. In this embodiment, the clutch half-engagement point temperature compensation curve is shown in the table below (unit: bar):

[0134] -10℃ 0℃ 30℃ 60℃ 90℃ -0.4 -0.28 -0.03 0 0.04

[0135] S24-2, Calculate the clutch basic half-engagement point VKP: VKP = VKP init +CP temp The clutch basic half-engagement point learning is complete, marked by position 1. The clutch basic half-engagement point learning is finished.

[0136] S3. Determine whether the clutch torque half-engagement point adaptive is engaged. If so, execute S4.

[0137] In this embodiment, determining whether the clutch torque half-engagement point has been entered adaptively includes the following criteria:

[0138] (1) All of the adaptive triggering conditions for the clutch half-engagement point are met;

[0139] (2) The clutch basic half-engagement point learning completion flag is 1.

[0140] S4: Clutch torque half-engagement point adaptive, based on the basic half-engagement point, adapts to the friction characteristics of the clutch friction plates. Detailed steps are as follows... Figure 3 As shown, the details are as follows:

[0141] S41. Request to engage the target gear, including the following steps:

[0142] S41-1. Based on the vehicle's current driving gear, set the clutch torque half-engagement point to adaptively target the gear and issue a gear engagement request;

[0143] S41-2. Determine whether the target gear is successfully engaged. If yes, proceed to step S42; otherwise, proceed to step S41-1.

[0144] S42, Clutch torque half-engagement point oil filling control, including the following steps:

[0145] S42-1, Calculate the clutch torque half-engagement point target pressure TKP fill , specifically:

[0146] First, select the clutch base engagement point VKP and the currently applied clutch engagement point KP. old The larger value in the equation is used as the adaptive initial value TKP for the clutch torque half-engagement point. init Then, based on the set clutch torque half-engagement point, the adaptive step size Step is used. tkpNumber of times N is adaptive to the clutch torque half-engagement point tkp Clutch torque half-engagement point adaptive direction D tkp Calculate the clutch torque half-engagement point target pressure TKP fill TKP fill =TKP init +Step tkp ×N tkp ×D tkp .

[0147] S42-2, Control the non-torque clutch to achieve the target pressure TKP at the clutch torque half-engagement point. fill The clutch is filled with oil to meet the target pressure, and the clutch torque half-engagement point adaptive oil filling timer is triggered simultaneously.

[0148] S42-3, Determining the adaptive oil filling time T for clutch torque half-engagement fill Is it greater than the set oil filling time threshold t? fill If yes, proceed to step S43; otherwise, proceed to S42-2. In this embodiment, the oil filling time threshold t... fill Set to 600ms.

[0149] S43, Clutch half-engagement point torque learning, includes the following steps:

[0150] S43-1, Request torque half-engagement point adaptive target gear TG tkp Return to empty, triggering the gear return timer.

[0151] S43-2. ​​Determine whether the target gear shift fork displacement signal has reached the set shift fork displacement threshold range. If yes, proceed to step S43-3. If no, wait for the shift fork to return to neutral and continue to determine.

[0152] In this embodiment, the shift fork displacement threshold is set to 4.5mm to confirm that the shift fork has disengaged from the gear engagement, eliminate the influence of vehicle speed on the clutch output speed, and improve the accuracy of torque calculation.

[0153] S43-3: Determine whether the speed difference between the input and output ends of the non-torque transmission clutch is less than the set first output speed difference threshold. If yes, proceed to S43-4; otherwise, wait and continue to determine. The first output speed difference threshold is set to 200 rpm.

[0154] S43-4. Record the current clutch output speed value as the clutch first output speed OutSpd1, and simultaneously trigger the half-engagement point torque learning timer.

[0155] S43-5. Determine whether the speed difference between the input and output ends of the non-torque transmission clutch is less than the set second output speed difference threshold. If yes, proceed to step S43-6; otherwise, wait and continue to determine.

[0156] Because the clutch friction characteristics are affected by the speed difference, the closer the first output speed difference threshold and the second output speed difference threshold are, the higher the accuracy of the clutch torque calculation. However, this is affected by the TCU task cycle and the response accuracy of the speed sensor. The second output speed difference threshold is set to 50 rpm.

[0157] S43-6. Record the current clutch output speed as the second output speed of the clutch, OutSpd2, and simultaneously record the current value of the half-engagement torque learning timer as the half-engagement torque learning time, T. tkp .

[0158] S43-7. Calculate key parameters for adaptive clutch torque half-engagement point: including the initial value of clutch half-engagement point torque Torq. tkp Number of times N is adaptive to the clutch torque half-engagement point tkp Adaptive direction D of clutch torque half-engagement point tkp .

[0159] (1) Calculate the initial value of the clutch half-engagement torque Torq tkp Calculation formula: Torq tkp =I*α, where I is the moment of inertia at the clutch output end and α is the acceleration at the clutch output end. When the clutch's first output speed is OutSpd1, second output speed is OutSpd2, and the half-engagement torque learning time is T... tkp When both values ​​are non-zero and OutSpd1 ≠ OutSpd2, then α = (OutSpd1 - OutSpd2) / T tkp When the clutch's first output speed OutSpd1, second output speed OutSpd2, and half-engagement torque learning time T tkp If any value in the α range is 0, or if OutSpd1 = OutSpd2, then α = 0.

[0160] (2) Calculate the number of adaptive clutch torque half-engagement point N tkp If Torq tkp ≠0, then N tkp Add 1 if Torq tkp =0, then N tkp Remain unchanged;

[0161] (3) Calculate the adaptive direction D of the clutch torque half-engagement point. tkp : Number of times N is the clutch torque half-engagement point adaptive tkpWhen = 0, if the initial value of the clutch half-engagement torque is Torq tkp ≠0 and Torq tkp The torque value Torq is less than the set minimum torque value at the clutch half-engagement point. min Then D tkp =1; if Torq tkp The maximum torque value Torq at the set clutch half-engagement point is greater than the specified value. max Then D tkp =-1; if neither of the above two cases is true, then D tkp =0. The number of times N adapts to the clutch torque half-engagement point. tkp When ≠0, then D tkp It remains unchanged.

[0162] S43-8. Determine whether the clutch half-engagement point torque learning timer is less than the set clutch half-engagement point torque learning time threshold. If not, proceed to step S43-9; if yes, proceed to step S43-11. The clutch half-engagement point torque learning time threshold is determined based on the hydraulic system response and the shift fork engagement time. In this embodiment, it is set to 2 seconds.

[0163] S43-9 Determining the initial value of the clutch half-engagement torque Torq tkp Is it greater than 0? If yes, execute S43-10; if no, execute step S43-2.

[0164] S43-10. Calculate the clutch half-engagement point torque and pressure, specifically:

[0165] When the clutch torque half-engagement point adaptive direction D tkp ≠-1 and the initial value of the clutch half-engagement torque is Torq tkp The maximum torque value Torq at the set clutch half-engagement point is greater than the specified value. max (i.e., condition A); or, when the clutch torque half-engagement point adaptive direction D... tkp = -1 and the initial value of the clutch half-engagement torque Torq tkp The torque value Torq is less than the set minimum torque value at the clutch half-engagement point. min When condition B is met, the initial value of the clutch half-engagement torque Torq calculated in the previous operation is taken. tkp_z Torq, the torque value at the clutch half-engagement point bp Torq bp =Torq tkp_z Correspondingly, the clutch half-engagement point pressure Press bp Take the oil filling pressure TKP from the last adaptive test. fill_z That is: Press bp =TKP fill_zIn other cases, the torque and pressure at the clutch half-engagement point remain unchanged.

[0166] In this embodiment, the maximum torque value Torq at the clutch half-engagement point max minimum torque value Torq at the clutch half-engagement point min It is determined based on the overall vehicle performance requirements and the friction characteristics of the clutch, such as the response speed during crawling and starting, starting impact, and overall vehicle impact during lever switching. In this embodiment, Torq... max Set to 8 Nm, Torq min The preferred setting is 4 Nm. When the clutch half-engagement torque is controlled within this range, the overall vehicle performance is excellent.

[0167] S43-11, Calculate the adaptive flag for the clutch half-engagement point: When the initial value of the clutch half-engagement point torque is Torq... tkp Torq, greater than the maximum torque value at the clutch half-engagement point max Or, when Torq tkp The torque value Torq is greater than 0 and less than the minimum torque value at the clutch half-engagement point. min If the clutch half-engagement point adaptive flag is set to 1, then the clutch half-engagement point adaptive flag will be set to 0.

[0168] S43-12, The target current of the non-torque transmission clutch solenoid valve is 0. When the clutch oil discharge time T drain The clutch oil release time threshold t is greater than the set value. drain At that time, proceed to step S5.

[0169] S5: Determine whether the current clutch target half-engagement point torque value has reached the set threshold. If yes, the clutch half-engagement point adaptive adjustment ends; otherwise, execute S6.

[0170] S6: Determine whether to enter clutch pressure follow-adaptive mode. If all of the following conditions are met, then determine whether to enter clutch pressure follow-adaptive mode; otherwise, proceed to step S1.

[0171] (1) The adaptive triggering conditions for the clutch half-engagement point described in step S1 are all met;

[0172] (2) The flag indicating completion of basic clutch half-engagement point learning is 1;

[0173] (3) The adaptive flag for clutch torque half engagement point is set to 1.

[0174] S7: Clutch pressure follows adaptively, such as Figure 4 As shown, it includes the following steps:

[0175] S71, Control the non-torque clutch to the target pressure TKP at the clutch torque half-engagement point. fill During the oil filling process, when the clutch oil filling time T... fowlling Greater than the set oil filling time threshold t fowlling At that time, S72 is executed. In this embodiment, the oil filling time threshold t fowlling To ensure complete clutch filling and hydraulic system stability, a setting of 3 seconds is preferred.

[0176] S72, Control the target pressure of the non-torque clutch in a set pressure step. p Increase the pressure and calculate the maximum pressure difference ΔP between the clutch target pressure and the actual pressure. max When the clutch target pressure exceeds the set pressure, it will follow the adaptive maximum pressure threshold FP. max Then, step S73 is executed. In this embodiment, the pressure follows the adaptive maximum pressure threshold FP. max The influence of the clutch half-engagement point and oil filling on the subsequent clutch pressure follow-up control should be completely eliminated. In this embodiment, it is set to 5 bar.

[0177] S73. Calculate the torque and pressure at the clutch half-engagement point.

[0178] When ΔP max When the pressure is less than the set adaptive differential pressure threshold, the initial value of the current clutch half-engagement torque, Torq, is recorded. tkp Torq is the torque value at the clutch half-engagement point. bp Record the current clutch torque half-engagement point target pressure TKP fill Press at the clutch half-engagement point bp In other cases, Torq bp and Press bp The value remains unchanged. In this embodiment, the pressure-following adaptive differential pressure threshold is preferably set to 0.25 bar, based on the response characteristics of the hydraulic system and the stiffness characteristics of the clutch.

[0179] S74. Calculate the adaptive flag of the clutch half-engagement point.

[0180] When ΔP max If the pressure is less than the set adaptive differential pressure threshold, the clutch half-engagement point adaptive flag will be set to 1; otherwise, the clutch half-engagement point adaptive flag will remain at 0.

[0181] S75, the target current of the non-torque transmission clutch solenoid valve is 0. When the clutch oil release time T... drain The clutch oil release time threshold t is greater than the set value. drain At that time, the clutch pressure adaptively ends.

[0182] S8. Confirm whether the target pressure at the clutch half-engagement point simultaneously meets the requirements of clutch pressure and torque control. If yes, the clutch half-engagement point adaptive operation ends; otherwise, execute S3.

[0183] In this embodiment, a wet dual-clutch half-engagement point adaptive system includes a controller and a memory. The memory stores a computer-readable program, which, when invoked by the controller, can execute the steps of the wet dual-clutch half-engagement point adaptive method as described in this embodiment.

[0184] The computer-readable program can be functionally divided into a clutch half-engagement point adaptive trigger judgment unit, a clutch half-engagement point adaptive termination judgment unit, a clutch pressure following adaptive trigger judgment unit, and a torque half-engagement point target pressure calculation unit. Specifically: the clutch half-engagement point adaptive trigger judgment unit determines whether the non-torque transmission clutch has entered the basic half-engagement point learning stage and whether it has entered the clutch torque half-engagement point adaptive stage. The clutch half-engagement point adaptive termination judgment unit determines whether the current clutch target half-engagement point torque value has reached a set threshold. The clutch pressure following adaptive trigger judgment unit determines whether to enter the clutch pressure following adaptive stage. The torque half-engagement point target pressure calculation unit determines whether the clutch torque half-engagement point target pressure meets the requirements of clutch pressure and torque control.

[0185] In this embodiment, a vehicle employs a wet dual-clutch half-engagement point adaptive system as described in this embodiment.

[0186] In this embodiment, a storage medium stores a computer-readable program that, when invoked, can execute the steps of the wet dual-clutch half-engagement point adaptive method as described in this embodiment.

[0187] Figure 5 The diagram illustrates the adaptive process of the clutch half-engagement point according to an embodiment of the present invention, vividly demonstrating the implementation process of the present invention.

[0188] Figure 6 The diagram shown is an adaptive test curve of the clutch half-engagement point according to an embodiment of the present invention. It further demonstrates the adaptive process of learning from the basic half-engagement point to the torque half-engagement point, then entering the pressure follow-up adaptive process, and then entering the torque half-engagement point adaptive process again, thereby greatly improving the accuracy of the torque and pressure follow-up control of the clutch half-engagement point.

[0189] In this embodiment, a vehicle employs a wet dual-clutch half-engagement point adaptive system as described in this embodiment.

[0190] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A method for adaptive engagement point of a wet dual-clutch transmission, characterized in that, Includes the following steps: S1: Determine whether the non-torque transmission clutch has entered the clutch basic half-engagement point learning. If yes, proceed to step S2; otherwise, execute step S1. S2: Learning about the basic clutch semi-engagement point; S3: Determine whether the clutch torque half-engagement point adaptive has been entered. If yes, proceed to step S4; otherwise, proceed to step S1. S4: Clutch torque half-engagement point adaptive; S5: Determine whether the current clutch target half-engagement point torque value has reached the set threshold. If yes, the clutch half-engagement point adaptive adjustment ends. If no, proceed to step S6. S6: Determine if the clutch pressure follows the adaptive input. If yes, proceed to step S7; otherwise, proceed to step S1. S7: Clutch pressure adaptive follow; S8: Confirm whether the target pressure at the clutch half-engagement point simultaneously meets the requirements of clutch pressure and torque control. If yes, the clutch half-engagement point adaptive operation ends; otherwise, proceed to step S3.

2. The adaptive method for the half-engagement point of a wet dual-clutch according to claim 1, characterized in that: In step S1, when all of the following conditions are met, it is considered that the non-torque transmission clutch has entered the clutch basic half-engagement point learning. (1) The vehicle is driving stably in the preset gear; (2) The transmission fluid temperature is within the preset temperature range; (3) The driver did not apply the brakes; (4) The throttle is greater than the minimum throttle threshold, and the throttle change rate is less than the throttle change rate threshold; (5) The engine speed is within the preset speed threshold range; (6) The non-torque transmission clutch does not complete the half-engagement point self-adaptation.

3. The adaptive method for the half-engagement point of a wet dual-clutch according to claim 1, characterized in that: Step S2 includes the following steps: S21. Request all gears on the input shaft where the non-torque transmission clutch is located, and determine whether all shift fork positions on the input shaft are within the set displacement threshold range. If so, proceed to step S22. S22, Learn the average pressure change rate of the clutch; S23. Learn the initial value of the clutch's basic half-engagement point; S24. Calculate the basic half-engagement point of the clutch.

4. The adaptive method for the half-engagement point of a wet dual-clutch according to claim 3, characterized in that: Step S22 includes the following steps: S22-1, Control the non-torque clutch to the set target current TC prefill Pre-filling with oil is performed, when the pre-filling time T prefill Greater than the set pre-filling time threshold t prefill When the time comes, proceed to step S22-2; S22-2, Control the current of the non-torsion clutch solenoid valve in a set current step. c Ascending, during this process, when the actual clutch pressure exceeds the set minimum pressure threshold TP min When the actual clutch pressure exceeds the set maximum pressure threshold TP, the maximum pressure change rate of the clutch is calculated. max At that time, record the current maximum clutch pressure change rate Grad max Proceed to step S22-3; S22-3, The target current of the control non-torque transmission clutch solenoid valve is 0, when the clutch oil discharge time T drain The clutch oil release time threshold t is greater than the set value. drain When the time comes, proceed to step S22-4; S22-4, Calculate the clutch mean pressure change rate Grad avg ; S22-5. Determine if the average pressure change rate of the clutch is 0. If yes, return to step S22-1; otherwise, proceed to step S23.

5. The adaptive method for the half-engagement point of a wet dual-clutch according to claim 3, characterized in that: Step S23 includes the following steps: S23-1, Control the non-torque clutch to the set target current TC prefill Pre-filling with oil is performed, when the pre-filling time T prefill Greater than the set pre-filling time threshold t prefill When the time comes, proceed to step S23-2; S23-2, Control the current of the non-torsion clutch solenoid valve in a set current step size. c Increment the clutch pressure and calculate the actual clutch pressure change rate Grad; when the actual clutch pressure change rate Grad is greater than the clutch average pressure change rate Grad... avg At that time, the current actual clutch pressure is recorded as the initial value VKP at the clutch base half-engagement point. init and proceed to step S23-3; S23-3, Control the target current of the non-torque transmission clutch solenoid valve to be 0; when the clutch oil discharge time T drain The clutch oil release time threshold t is greater than the set value. drain At that time, proceed to step S24.

6. The adaptive method for the half-engagement point of a wet dual-clutch according to claim 5, characterized in that: Step S24 includes the following steps: S24-1. Calculate the clutch half-engagement point temperature compensation value CP based on the transmission oil temperature and clutch half-engagement point temperature compensation curve, referring to the table. temp ; S24-2, Calculate the clutch basic half-engagement point VKP: VKP = VKP init +CP temp The clutch basic half-engagement point learning is complete, marked by position 1. The clutch basic half-engagement point learning is finished.

7. The adaptive method for the half-engagement point of a wet dual-clutch according to claim 6, characterized in that: Step S4 includes the following steps: S41, Request to engage the target gear. S42, Clutch torque half-engagement point oil filling control; S43, learning the torque at the clutch half-engagement point.

8. The adaptive method for the half-engagement point of a wet dual-clutch according to claim 7, characterized in that: Step S41 includes the following steps: S41-1. Based on the vehicle's current driving gear, set the clutch torque half-engagement point to adaptively target the gear and issue a gear engagement request; S41-2. Determine whether the target gear is successfully engaged. If yes, proceed to step S42; otherwise, proceed to step S41-1.

9. The adaptive method for the half-engagement point of a wet dual-clutch according to claim 7, characterized in that: Step S42 includes the following steps: S42-1, Calculate the clutch torque half-engagement point target pressure TKP fill ; S42-2, Control the non-torque clutch to achieve the target pressure TKP at the clutch torque half-engagement point. fill The clutch is filled with oil to meet the target pressure, and the clutch torque half-engagement point adaptive oil filling timer is triggered simultaneously. S42-3, Determining the adaptive oil filling time T for clutch torque half-engagement fill Is it greater than the set oil filling time threshold t? fill If yes, proceed to step S43; otherwise, proceed to step S42-2.

10. The adaptive method for the half-engagement point of a wet dual-clutch according to claim 9, characterized in that: Step S42-1 specifically involves: Select the clutch base engagement point VKP and the currently applied clutch engagement point KP. old The larger value in the equation is used as the adaptive initial value TKP for the clutch torque half-engagement point. init ; Adaptive step size based on the set clutch torque half-engagement point. tkp Number of times N is adaptive to the clutch torque half-engagement point tkp Clutch torque half-engagement point adaptive direction D tkp Calculate the clutch torque half-engagement point target pressure TKP fill Among them, TKP fill =TKP init +Step tkp ×N tkp ×D tkp .

11. The adaptive method for the half-engagement point of a wet dual-clutch according to claim 9, characterized in that: Step S43 includes the following steps: S43-1, Request torque half-engagement point adaptive target gear TG tkp Return to neutral, triggering the gear return timer; S43-2. ​​Determine whether the target gear shift fork displacement signal has reached the set shift fork displacement threshold range. If yes, proceed to step S43-3; otherwise, wait for the shift fork to return to neutral and continue to determine. S43-3. Determine whether the speed difference between the input and output ends of the non-torque transmission clutch is less than the set first output speed difference threshold. If yes, execute S43-4. If no, wait and continue to determine. S43-4. Record the current clutch output speed value as the clutch first output speed OutSpd1, and simultaneously trigger the half-engagement point torque learning timer. S43-5. Determine whether the speed difference between the input and output ends of the non-torque transmission clutch is less than the set second output speed difference threshold. If yes, proceed to step S43-6. If no, wait and continue to determine. S43-6. Record the current clutch output speed as the second output speed of the clutch, OutSpd2, and simultaneously record the current value of the half-engagement torque learning timer as the half-engagement torque learning time, T. tkp ; S43-7. Calculate the key parameters for adaptive clutch torque half-engagement point, including the initial value of clutch half-engagement point torque Torq. tkp Number of times N is adaptive to the clutch torque half-engagement point tkp Adaptive direction D of clutch torque half-engagement point tkp ; S43-8. Determine whether the clutch half-engagement point torque learning timer is less than the set clutch half-engagement point torque learning time threshold. If not, proceed to step S43-9; if yes, proceed to step S43-11. S43-9 Determining the initial value of the clutch half-engagement torque Torq tkp Is it greater than 0? If yes, proceed to step S43-10; otherwise, proceed to step S43-2. S43-10. Calculate the torque and pressure at the clutch half-engagement point; S43-11, Calculate the adaptive flag for the clutch half-engagement point: When the initial value of the clutch half-engagement point torque is Torq... tkp Torq, greater than the maximum torque value at the clutch half-engagement point max Or, when the initial value of the clutch half-engagement torque is Torq tkp The torque value Torq is greater than 0 and less than the minimum torque value at the clutch half-engagement point. min When the clutch half-engagement point adaptive flag is set to 1, the clutch half-engagement point adaptive flag is set to 0. S43-12, Control the target current of the non-torque transmission clutch solenoid valve to be 0; when the clutch oil discharge time T drain The clutch oil release time threshold t is greater than the set value. drain At that time, proceed to step S5.

12. The adaptive method for the half-engagement point of a wet dual-clutch according to claim 11, characterized in that: Step S43-10 includes: When either condition A or condition B is met, the initial value of the clutch half-engagement torque Torq from the previous calculation is taken. tkp_z Torq, the torque at the clutch half-engagement point bp Torq bp =Torq tkp_z Clutch half-engagement point pressure bp Take the oil filling pressure TKP from the last adaptive test. fill_z That is: Press bp =TKP fill_z When neither condition A nor condition B is met, the clutch half-engagement point torque and pressure remain unchanged. Condition A: Adaptive direction of clutch torque half-engagement point D tkp ≠-1, initial value of clutch half-engagement torque Torq tkp The maximum torque value Torq at the set clutch half-engagement point is greater than the specified value. max ; Condition B: Adaptive direction of clutch torque half-engagement point D tkp =-1, initial value of clutch half-engagement torque Torq tkp The torque value Torq is less than the set minimum torque value at the clutch half-engagement point. min .

13. The adaptive method for the half-engagement point of a wet dual-clutch according to claim 9, characterized in that: Step S7 includes the following steps: S71, Control the non-torque clutch to the target pressure TKP at the clutch torque half-engagement point. fill During the oil filling process, when the clutch oil filling time T... fowlling Greater than the set oil filling time threshold t fowlling At that time, execute S72; S72, Control the target pressure of the non-torque clutch in a set pressure step. p Increase the pressure and calculate the maximum pressure difference ΔP between the clutch target pressure and the actual pressure. max When the clutch target pressure exceeds the set pressure follower adaptive maximum pressure threshold FP max When the time comes, proceed to step S73; S73. Calculate the torque and pressure at the clutch half-engagement point; S74. Calculate the adaptive flag for the clutch half-engagement point; S75, the target current of the non-torque transmission clutch solenoid valve is 0, when the clutch oil discharge time T drain The clutch oil release time threshold t is greater than the set value. drain At that time, the clutch pressure adaptively ends.

14. The adaptive method for the half-engagement point of a wet dual-clutch according to claim 13, characterized in that: Step S73 specifically involves: When ΔP max When the pressure is less than the set adaptive differential pressure threshold, the initial value of the current clutch half-engagement torque, Torq, is recorded. tkp Torq is the torque value at the clutch half-engagement point. bp Record the current clutch torque half-engagement point target pressure TKP fill Press at the clutch half-engagement point bp In other cases, Torq bp and Press bp It remains unchanged.

15. The adaptive method for the half-engagement point of a wet dual-clutch according to claim 13, characterized in that: Step S74 specifically involves: When ΔP max If the pressure is less than the set adaptive differential pressure threshold, the clutch half-engagement point adaptive flag will be set to 1; otherwise, the clutch half-engagement point adaptive flag will remain at 0.

16. A wet dual-clutch half-engagement point adaptive system, characterized in that: It includes a controller and a memory, the memory storing a computer-readable program that, when invoked by the controller, can perform the steps of the wet dual-clutch half-engagement point adaptive method as described in any one of claims 1 to 15.

17. A vehicle, characterized in that: The wet dual-clutch half-engagement point adaptive system as described in claim 16 is adopted.

18. A storage medium, characterized in that: It contains a computer-readable program that, when invoked, performs the steps of the wet dual-clutch half-engagement point adaptive method as described in any one of claims 1 to 15.

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