Clutch oil filling control method and device, automatic transmission control unit and medium

Abstract

The embodiment of the application discloses a clutch oil filling control method and device, an automatic gearbox control unit and a medium. The method comprises the following steps: in the forward gear-reverse gear switching process, the odd clutch is controlled to be filled with oil, so that the actual pressure of the odd clutch rises and is always less than the preset pressure, and the preset pressure is less than the half combination point pressure of the odd clutch; based on the preset pressure, the odd clutch is controlled to be filled with oil, so that the actual pressure is always less than the preset pressure, and a first pressure difference between the actual pressure and the preset pressure is located in a first difference range; based on the preset pressure as an initial pressure, and the control pressure gradually rising to a target pressure according to a rising curve, the odd clutch is controlled to be filled with oil, so that the slope of the change curve of the torque transmitted by the odd clutch is located in a slope range; and based on the target pressure, the odd clutch is controlled to be filled with oil to complete the gear switching. The technical scheme of the embodiment of the application can avoid the vehicle from being jolted in the gear shifting process.

Description

Technical Field

[0001] The present invention relates to the field of automotive technology, and in particular to a clutch oil filling control method, device, automatic transmission control unit and medium. Background Technology

[0002] With the development of automotive technology, automatic transmissions are being used more and more widely. Among the many types of automatic transmissions, the dual-clutch transmission (DCT) combines the advantages of manual transmissions and hydraulic automatic transmissions, and therefore has gained favor from many manufacturers and market users.

[0003] In DCT, which is responsible for odd-numbered driveshafts and odd-numbered clutches for odd-numbered gears and reverse gears, in order to ensure rapid gear shifting, when reverse gear on the odd-numbered driveshaft is fully engaged, the automatic transmission control unit (TCU) will control the odd-numbered clutch to start filling with oil. This causes the odd-numbered clutch pressure (i.e., the actual pressure of the odd-numbered clutch) to build up rapidly at this time.

[0004] In the process of realizing this invention, the inventors discovered the following technical problems in the prior art: the rapid establishment of odd-numbered clutch pressure causes the torque transmitted by the odd-numbered clutch to change rapidly, which further causes the vehicle to jerk during the shift from forward to reverse gear, affecting the driving experience. Summary of the Invention

[0005] This invention provides a clutch oil filling control method, device, automatic transmission control unit, and medium, which solves the problem of vehicle jerking during forward-reverse gear shifting.

[0006] According to one aspect of the present invention, a clutch oil filling control method is provided, which may include:

[0007] When a shift from forward to reverse is detected, the odd-numbered clutches corresponding to reverse in the dual-clutch transmission are controlled to fill with oil, so that the actual pressure of the odd-numbered clutches rises and is always less than the preset pressure, wherein the preset pressure is less than the half-engagement point pressure of the odd-numbered clutches.

[0008] Based on the preset pressure, the odd-numbered clutches are controlled to fill with oil so that the actual pressure of the odd-numbered clutches is always less than the preset pressure and the first pressure difference between the odd-numbered clutches and the preset pressure is within the preset first difference range.

[0009] Based on the control pressure that starts at a preset pressure and gradually rises to the target pressure according to a preset rising curve, the odd-numbered clutches are controlled to fill with oil so that the slope of the torque change curve transmitted by the odd-numbered clutches is within the preset slope range.

[0010] Based on the target pressure, the odd-numbered clutches are controlled to fill with oil to complete gear shifting.

[0011] According to another aspect of the present invention, a clutch oil filling control device is provided, which may include:

[0012] The clutch filling control module is used to control the filling of the odd clutch corresponding to the reverse gear in the dual-clutch transmission when the gear is detected to be shifted from forward gear to reverse gear, so that the actual pressure of the odd clutch increases and is always less than the preset pressure, wherein the preset pressure is less than the half-engagement point pressure of the odd clutch.

[0013] The clutch filling second control module is used to control the filling of odd clutches with oil based on a preset pressure, so that the actual pressure of the odd clutches is always less than the preset pressure and the first pressure difference between the odd clutches and the preset pressure is within a preset first difference range.

[0014] The third control module for clutch oil filling is used to control the oil filling of odd-numbered clutches based on a control pressure that is initially set at a preset pressure and gradually rises to the target pressure according to a preset rising curve, so that the slope of the torque change curve transmitted by the odd-numbered clutches is within a preset slope range.

[0015] The fourth control module for clutch oil filling is used to control the oil filling of odd-numbered clutches based on the target pressure to complete gear shifting.

[0016] According to another aspect of the present invention, an automatic transmission control unit is provided, which may include:

[0017] At least one processor; and

[0018] A memory that is communicatively connected to at least one processor; wherein,

[0019] The memory stores a computer program that can be executed by at least one processor, such that when the at least one processor executes the program, it implements the clutch oil filling control method provided in any embodiment of the present invention.

[0020] According to another aspect of the present invention, a computer-readable storage medium is provided having computer instructions stored thereon for causing a processor to execute and implement the clutch oil filling control method provided in any embodiment of the present invention.

[0021] The technical solution of this invention, when detecting a shift from forward to reverse, controls the oil filling of the odd-numbered clutches corresponding to reverse in the dual-clutch transmission, so that the actual pressure of the odd-numbered clutches rises and remains below a preset pressure. This preset pressure is less than the half-engagement point pressure of the odd-numbered clutches, that is, pressure is established for the odd-numbered clutches while ensuring that they do not transmit torque or only transmit a very small amount of torque. Based on the preset pressure, the oil filling of the odd-numbered clutches is controlled so that the actual pressure of the odd-numbered clutches is always less than the preset pressure and the first pressure difference between the two is within a preset first difference range, thus stabilizing the actual pressure of the odd-numbered clutches at a level that prevents them from transmitting torque or allows them to transmit only a very small amount of torque. Based on a control pressure that starts at the preset pressure and gradually rises to the target pressure according to a preset rising curve, the oil filling of the odd-numbered clutches is controlled so that the slope of the torque change curve transmitted by the odd-numbered clutches is within a preset slope range, thus ensuring that the torque transmitted by the odd-numbered clutches rises smoothly. Based on the target pressure, the oil filling of the odd-numbered clutches is controlled to complete the shift from forward to reverse. The above technical solution, after establishing pressure for the odd-numbered clutches, controls the oil filling of the odd-numbered clutches to stabilize their actual pressure below the half-engagement point pressure for a period of time. Then, it continues to control the oil filling of the odd-numbered clutches to allow the torque transmitted by the odd-numbered clutches to rise smoothly, thus completing the gear shift. This solves the problem of rapid torque increase caused by the odd-numbered clutches due to the actual pressure of the odd-numbered clutches rising directly to the target pressure, which leads to vehicle jerking. It ensures the smoothness of the forward-to-reverse gear shifting process.

[0022] It should be understood that the description in this section is not intended to identify key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a flowchart of a clutch oil filling control method according to an embodiment of the present invention;

[0025] Figure 2 This is a flowchart of another clutch oil filling control method provided according to an embodiment of the present invention;

[0026] Figure 3 This is a flowchart of another clutch oil filling control method provided according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram illustrating the change of control pressure for controlling the oil filling of odd-numbered clutches in another clutch oil filling control method provided by an embodiment of the present invention.

[0028] Figure 5 This is a structural block diagram of a clutch oil filling control device according to an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of an automatic transmission control unit that implements the clutch oil filling control method of the present invention. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. The same applies to "target," "original," etc., and will not be repeated here. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0032] Before introducing the embodiments of the present invention, the cause of the vehicle jerking problem during the forward-reverse gear shifting process described in the background art will be explained by way of example, so as to better understand why the clutch oil filling control scheme proposed in the embodiments of the present invention can solve this problem.

[0033] For example, a dual-clutch transmission (DCT), also known as a wet DCT, may include an odd-numbered clutch and an even-numbered clutch. The odd-numbered clutch is responsible for odd-numbered forward gears such as first, third, and fifth gears, as well as reverse gear, while the even-numbered clutch is responsible for even-numbered forward gears such as second, fourth, and sixth gears.

[0034] The half-engagement point pressure can be understood as the actual pressure (i.e., engagement pressure) of the odd-numbered clutch when the driving and driven friction plates are in a half-engaged state. It should be noted that during the engagement of the driving and driven friction plates, the torque transmission capacity of the odd-numbered clutch does not change linearly with the engagement pressure. Typically, when the engagement pressure is less than the half-engagement point pressure, the torque transmitted by the odd-numbered clutch approaches zero; conversely, the torque transmitted by the odd-numbered clutch changes rapidly according to the clutch gain, for example, from a very small value to around 10 N·m.

[0035] Building on this, it's important to further explain that this rapidly changing torque can cause vehicle jerking. While the vehicle is in motion, this jerking is less noticeable to the driver. However, during the shift from drive to reverse, when the vehicle is essentially stationary, this jerking becomes more pronounced. Therefore, to ensure a good driving experience, the torque transmission process of the odd-numbered clutches needs to be controlled.

[0036] Based on this, it should be further explained that the torque transmitted by the odd-numbered clutches can be controlled by controlling the filling and emptying of the odd-numbered clutches. Therefore, the following embodiments propose corresponding clutch filling control schemes to control the torque transmission process of the odd-numbered clutches, thereby eliminating the vehicle jerking sensation caused by torque switching during the forward-reverse shifting process, making the shifting process smoother.

[0037] Next, we will elaborate on this in detail.

[0038] Figure 1 This is a flowchart of a clutch oil filling control method provided in an embodiment of the present invention. This embodiment is applicable to situations where, during forward-to-reverse gear shifting, the odd-numbered clutches are controlled to complete the shift, particularly suitable for situations where the goal is to ensure a smooth change in the torque transmitted by the odd-numbered clutches. This method can be executed by the clutch oil filling control device provided in this embodiment of the present invention, which can be implemented by software and / or hardware, and can be integrated into the automatic transmission control unit (TCU).

[0039] See Figure 1 The method of this invention specifically includes the following steps:

[0040] S110. When the gear is detected to shift from forward to reverse, the odd clutch corresponding to reverse in the dual-clutch transmission is controlled to fill with oil so that the actual pressure of the odd clutch increases and is always less than the preset pressure, wherein the preset pressure is less than the half-engagement point pressure of the odd clutch.

[0041] The preset pressure can be understood as a pressure pre-set based on the half-engagement point pressure of the odd-numbered clutches, specifically a pressure lower than the half-engagement point pressure, meaning that the odd-numbered clutches will basically not transmit torque or will only transmit a very small amount of torque. In practical applications, optionally, the torque transmission characteristics of different vehicles can be comprehensively analyzed to set the preset pressure, thereby obtaining a preset pressure applicable to a variety of vehicles.

[0042] When a shift from forward to reverse is detected, especially when a shift from one of the forward gears to reverse is detected, the odd-numbered clutch is controlled to fill with oil so that the driving and driven friction plates of the odd-numbered clutch gradually engage. This causes the actual pressure of the odd-numbered clutch to continuously rise and always remain below the preset pressure, in order to avoid rapid changes in the torque transmitted by the odd-numbered clutch.

[0043] S120. Based on the preset pressure, control the oil filling of the odd clutches so that the actual pressure of the odd clutches is always less than the preset pressure and the first pressure difference between the odd clutches and the preset pressure is within the preset first difference range.

[0044] The first pressure difference can be understood as the difference between the actual pressure and the preset pressure. Optionally, in the current stage, since the actual pressure is always less than the preset pressure, the first pressure difference can be represented as the preset pressure minus the actual pressure. The first difference range can be understood as a preset range related to the first pressure difference, specifically a very small range, thus ensuring that the first pressure difference falling within this range remains stable.

[0045] Considering the response delay in the hydraulic system, a slow filling and holding phase, as shown in this step, is implemented to prevent vehicle jerking caused by rapid pressure build-up in the odd-numbered clutches. This stabilizes the actual pressure of the odd-numbered clutches at a level that essentially prevents them from transmitting torque or only transmits a very small amount of torque. Specifically, based on a preset pressure, the filling of the odd-numbered clutches is controlled so that the actual pressure of the odd-numbered clutches is always lower than the preset pressure, and the first pressure difference between the two is within a first difference range. This stabilizes the actual pressure of the odd-numbered clutches below the half-engagement point pressure for a period of time, effectively eliminating vehicle jerking caused by excessively rapid filling of the odd-numbered clutches.

[0046] Additionally, it should be noted that another advantage of stabilizing the actual pressure of the odd-numbered clutches below and close to the preset pressure is that it allows the slow oil filling phase of S130 to have a controllable initial pressure (i.e., preset pressure), making the oil filling control in this phase meaningful.

[0047] S130. Based on the control pressure that is initially set as a preset pressure and gradually rises to the target pressure according to a preset rising curve, the odd-numbered clutches are controlled to fill with oil so that the slope of the torque change curve transmitted by the odd-numbered clutches is within the preset slope range.

[0048] The target pressure can be understood as the pressure that the odd-numbered clutches must ultimately reach to complete the gear shifting process. The control pressure in this step can be understood as the pressure that starts with a preset pressure and gradually increases to the target pressure according to a rising curve. This rising curve can be understood as a pre-set curve characterizing the way the control pressure rises, and more specifically, as a compensation curve created based on the characteristics of the hydraulic system. Under the control of this compensation curve, the torque transmitted by the odd-numbered clutches can rise smoothly.

[0049] The variation curve characterizes the change in torque transmitted by the odd-numbered clutches during the oil filling process controlled by the aforementioned control pressure. The slope can be understood as the slope at each point on the variation curve, reflecting the rate of change in torque transmitted by the odd-numbered clutches at that corresponding point. The slope range can be understood as a pre-set range related to the slope, specifically a very small numerical range.

[0050] Specifically, by this point, the odd-numbered clutches have established pressure and maintained it for a period of time, allowing the actual pressure of the odd-numbered clutches to follow the control pressure more effectively. Based on this, the odd-numbered clutches can be oiled using a preset initial pressure and a control pressure that gradually increases according to a rising curve. This ensures that the actual pressure of the odd-numbered clutches under such oiling control results in a curve whose slope of the torque transmission curve is within a certain range. In other words, the torque transmission curve of the odd-numbered clutches is smooth, not fluctuating. This means that the torque transmitted by the odd-numbered clutches increases steadily, rather than rapidly, thus avoiding vehicle jerking.

[0051] S140. Based on the target pressure, control the oil filling of the odd-numbered clutches to complete the gear shift.

[0052] As explained above, the target pressure is the pressure that the odd-numbered clutches must ultimately reach to complete the gear shifting process. Therefore, based on the target pressure, the oil filling of the odd-numbered clutches can be controlled to ensure that the actual pressure of the odd-numbered clutches reaches the target pressure, thus completing the forward-to-reverse gear shifting process.

[0053] In practical applications, this step can optionally include an oil filling waiting stage and an oil filling completion stage. Specifically, the oil filling waiting stage is set to prevent the actual pressure of the odd-numbered clutch from failing to accurately follow the control pressure used to control the oil filling of the odd-numbered clutch. Therefore, by executing the oil filling waiting stage, the accuracy of the actual pressure control can be guaranteed. Optionally, if the pressure difference between the actual pressure and the target pressure is less than the set value, the oil filling waiting stage can be exited, and the oil filling completion stage can be entered. In the oil filling completion stage, the odd-numbered clutch is fully engaged and can transmit torque normally; at this point, gear shifting is complete.

[0054] The technical solution of this invention, when detecting a shift from forward to reverse, controls the oil filling of the odd-numbered clutches corresponding to reverse in the dual-clutch transmission, so that the actual pressure of the odd-numbered clutches rises and remains below a preset pressure. This preset pressure is less than the half-engagement point pressure of the odd-numbered clutches, that is, pressure is established for the odd-numbered clutches while ensuring that they do not transmit torque or only transmit a very small amount of torque. Based on the preset pressure, the oil filling of the odd-numbered clutches is controlled so that the actual pressure of the odd-numbered clutches is always less than the preset pressure and the first pressure difference between the two is within a preset first difference range, thus stabilizing the actual pressure of the odd-numbered clutches at a level that prevents them from transmitting torque or allows them to transmit only a very small amount of torque. Based on a control pressure that starts at the preset pressure and gradually rises to the target pressure according to a preset rising curve, the oil filling of the odd-numbered clutches is controlled so that the slope of the torque change curve transmitted by the odd-numbered clutches is within a preset slope range, thus ensuring that the torque transmitted by the odd-numbered clutches rises smoothly. Based on the target pressure, the oil filling of the odd-numbered clutches is controlled to complete the shift from forward to reverse. The above technical solution, after establishing pressure for the odd-numbered clutches, controls the oil filling of the odd-numbered clutches to stabilize their actual pressure below the half-engagement point pressure for a period of time. Then, it continues to control the oil filling of the odd-numbered clutches to allow the torque transmitted by the odd-numbered clutches to rise smoothly, thus completing the gear shift. This solves the problem of rapid torque increase caused by the odd-numbered clutches due to the actual pressure of the odd-numbered clutches rising directly to the target pressure, which leads to vehicle jerking. It ensures the smoothness of the forward-to-reverse gear shifting process.

[0055] An optional technical solution for controlling the oil filling of odd-numbered clutches includes:

[0056] Based on the preset pressure and the preset third duration, the odd-numbered clutches are controlled to fill with oil.

[0057] The third duration can be understood as a preset value used to characterize the duration of oil filling for the odd-numbered clutches during the slow oil filling and holding phase. Oil filling of the odd-numbered clutches is controlled based on the preset pressure and the third duration.

[0058] The application of the third duration can avoid the situation where the slow fuel filling and holding phase cannot end, thus ensuring the smooth completion of gear shifting.

[0059] Another alternative technical solution involves controlling the oil filling of odd-numbered clutches based on the target pressure to complete gear shifting, including:

[0060] Based on the target pressure, the odd-numbered clutches are controlled to fill with oil, and during the filling process, a third pressure difference between the actual pressure of the odd-numbered clutches and the target pressure is determined;

[0061] If the third pressure difference is within the preset second difference range, or if the duration of the oil filling process exceeds the preset fourth duration, the gear shift is confirmed to be complete.

[0062] The third pressure difference can be understood as the difference between the actual pressure and the target pressure of the odd-numbered clutches. It is understandable that as the oil filling process progresses, the actual pressure of the odd-numbered clutches may continuously change, which would also cause the third pressure difference determined during the oil filling process to change continuously.

[0063] The second difference range can be understood as a pre-set range related to the third pressure difference, specifically a very small range. When the third pressure difference is within the second difference range, it indicates that the actual pressure of the odd-numbered clutch is basically the target pressure, meaning that the driving and driven friction plates of the odd-numbered clutch are basically engaged, and there is no need to add oil to the odd-numbered clutch; the gear shift is complete.

[0064] Of course, to avoid the situation where the actual pressure of the odd clutch fails to reach the target pressure, thus preventing the gear shift from being completed, the oil filling process can be stopped if it exceeds the preset fourth time, and the gear shift is considered to have been completed.

[0065] The above technical solutions ensure the smooth completion of gear shifting from different aspects.

[0066] Figure 2This is a flowchart of another clutch oil filling control method provided in this embodiment of the invention. This embodiment is an optimization based on the above-described technical solutions. In this embodiment, optionally, controlling the oil filling of the odd-numbered clutches corresponding to reverse gear in the dual-clutch transmission, so that the actual pressure of the odd-numbered clutches rises and is always less than a preset pressure, includes: controlling the oil filling of the odd-numbered clutches corresponding to reverse gear in the dual-clutch transmission based on a preset first duration and a first pressure, wherein the first pressure is greater than a target pressure; within a preset second duration, performing closed-loop control on the control pressure currently used to control the oil filling of the odd-numbered clutches based on the actual pressure of the odd-numbered clutches and the preset pressure to obtain a second pressure; and controlling the oil filling of the odd-numbered clutches based on the second pressure, so that the actual pressure of the odd-numbered clutches rises within the second duration and is always less than the preset pressure. The explanations of terms that are the same as or corresponding to those in the above embodiments are not repeated here.

[0067] See Figure 2 The method in this embodiment may specifically include the following steps:

[0068] S210. When a gear shift from forward to reverse is detected, based on a preset first duration and a first pressure, the odd-numbered clutches corresponding to the reverse gear in the dual-clutch transmission are controlled to fill with oil, wherein the first pressure is greater than the target pressure.

[0069] This step falls within the rapid oil filling phase. The first duration can be understood as a pre-set time, representing the duration of oil filling for the odd-numbered clutches during this phase. Within this first duration, oil filling of the odd-numbered clutches is controlled based on a first pressure greater than the target pressure. The application of this first pressure enables rapid oil filling of the odd-numbered clutches, thereby quickly establishing pressure and shortening the response time for the actual pressure of the odd-numbered clutches to reach the target pressure.

[0070] S220. Within a preset second time period, based on the actual pressure of the odd clutch and the preset pressure, the control pressure currently used to control the oil filling of the odd clutch is controlled in a closed loop to obtain a second pressure, wherein the preset pressure is less than the half-engagement point pressure of the odd clutch.

[0071] The current step is in the oil filling compensation stage, and the second duration can be understood as a pre-set duration used to characterize the duration of oil filling for the odd-numbered clutches during the oil filling compensation stage.

[0072] Since the rapid oil filling phase is an open-loop oil filling process, depending on the characteristics of the hydraulic system, it can easily lead to overfilling or underfilling. Therefore, pressure closed-loop control can be performed based on the actual pressure and target pressure of the odd-numbered clutches, and the oil filling of the odd-numbered clutches can be controlled on this basis to complete the oil filling compensation.

[0073] Specifically, during the second time period corresponding to the oil filling compensation phase, the control pressure used to control the oil filling of the odd clutch at the current moment can be closed-loop controlled based on the actual pressure and preset pressure of the odd clutch, so as to obtain the second pressure used to control the oil filling of the odd clutch at the next moment. This second pressure is the control pressure at the next moment.

[0074] S230. Based on the second pressure, control the oil filling of the odd clutch so that the actual pressure of the odd clutch rises during the second time period and is always less than the preset pressure.

[0075] Specifically, based on the second pressure, the odd-numbered clutches are controlled to fill with oil. In other words, when the next moment becomes the current moment, the odd-numbered clutches are controlled to fill with oil based on the second pressure.

[0076] During the second duration, S220 and S230 are executed repeatedly to provide oil filling for the odd clutch for the second duration, so that the actual pressure of the odd clutch continues to rise and is always less than the preset pressure.

[0077] S240. Based on the preset pressure, control the oil filling of the odd clutches so that the actual pressure of the odd clutches is always less than the preset pressure and the first pressure difference between the odd clutches and the preset pressure is within the preset first difference range.

[0078] S250. Based on the control pressure that is initially set as a preset pressure and gradually rises to the target pressure according to a preset rising curve, the odd-numbered clutches are controlled to fill with oil so that the slope of the torque change curve transmitted by the odd-numbered clutches is within the preset slope range.

[0079] S260. Based on the target pressure, control the oil filling of the odd-numbered clutches to complete the gear shift.

[0080] The technical solution of this invention, in the oil filling compensation stage, performs closed-loop control on the control pressure used to control the oil filling of the odd clutch, thereby effectively compensating for overfilling or underfilling that occurs in the rapid oil filling stage, and thus ensuring the effective operation of subsequent oil filling control.

[0081] An optional technical solution involves performing closed-loop control on the current control pressure used to control the oil filling of the odd-numbered clutches, based on the actual pressure and preset pressure of the odd-numbered clutches, to obtain a second pressure, including:

[0082] Determine the second pressure difference between the actual pressure and the preset pressure of the odd-numbered clutches;

[0083] Based on the second pressure difference, the control pressure currently used to control the oil filling of the odd-numbered clutches is controlled in a closed loop to obtain the second pressure.

[0084] The above technical solution uses the second pressure difference to perform closed-loop control of the control pressure. This makes the actual pressure of the odd clutch closer to the preset pressure after the control pressure is controlled to fill the odd clutch based on the closed-loop control, thereby ensuring the smooth progress of the subsequent slow filling and holding phase.

[0085] Figure 3 This is a flowchart of another clutch oil filling control method provided in this embodiment of the invention. This embodiment is an optimization based on the above-mentioned technical solutions. In this embodiment, optionally, after detecting a shift from forward gear to reverse gear, the above-mentioned clutch oil filling control method further includes: controlling the reverse gear shift fork to gradually engage with the odd-numbered driveshaft in the dual-clutch transmission, and during the gradual engagement process, controlling the even-numbered clutch in the dual-clutch transmission to gradually build up pressure; after controlling the odd-numbered clutch to fill with oil based on the target pressure, the above-mentioned clutch oil filling control method may further include: controlling the even-numbered clutch to release oil after the gear shift is completed, so that the actual pressure of the even-numbered clutch is reduced to a preset value. The explanations of terms that are the same as or corresponding to those in the above embodiments will not be repeated here.

[0086] See Figure 3 The method in this embodiment may specifically include the following steps:

[0087] S310. When a gear shift from forward to reverse is detected, the reverse shift fork is gradually engaged into the odd-numbered driveshaft of the dual-clutch transmission, and during the engagement process, the even-numbered clutches in the dual-clutch transmission are gradually pressured.

[0088] In this context, the reverse gear shift fork can be understood as the shift fork corresponding to reverse gear. The odd-numbered driveshaft can be understood as the driveshaft in a DCT that works with the odd-numbered clutches; correspondingly, the even-numbered driveshaft can be understood as the driveshaft in a DCT that works with the even-numbered clutches.

[0089] To shift from forward to reverse, the reverse fork can be controlled to gradually engage the odd-numbered driveshaft. During this gradual engagement, pressure can also be gradually built up on the even-numbered clutches, ensuring that they transmit a portion of the positive torque. In particular, the positive torque transmitted from the even-numbered driveshaft to the output shaft is greater than the negative torque transmitted from the odd-numbered driveshaft in reverse to the output shaft. This ensures that the engaged reverse gear always maintains a forward rotation tendency, effectively reducing noise caused by the reverse fork engaging during gear shifting.

[0090] S320. Control the oil filling of the odd clutch corresponding to reverse gear in the dual-clutch transmission so that the actual pressure of the odd clutch rises and is always less than the preset pressure, wherein the preset pressure is less than the half-engagement point pressure of the odd clutch.

[0091] S330. Based on the preset pressure, control the oil filling of the odd clutches so that the actual pressure of the odd clutches is always less than the preset pressure and the first pressure difference between the odd clutches and the preset pressure is within the preset first difference range.

[0092] S340. Based on the control pressure that is initially set as a preset pressure and gradually rises to the target pressure according to a preset rising curve, the odd-numbered clutches are controlled to fill with oil so that the slope of the torque change curve transmitted by the odd-numbered clutches is within the preset slope range.

[0093] Building upon the S310, the reverse gear is always in a forward rotation trend, effectively reducing noise caused by the reverse gear fork during gear shifting. Furthermore, combining the S330 and S340 allows for a smooth increase in torque transmitted by the odd-numbered clutches. Compared to a rapid increase, this prevents the transmission system from quickly switching from a forward rotation trend to a reverse rotation trend, thus avoiding vehicle jerking.

[0094] S350. Based on the target pressure, control the oil filling of the odd-numbered clutches to complete gear shifting.

[0095] S360. When gear shifting is complete, control the even-numbered clutch to release oil so that the actual pressure of the even-numbered clutch is reduced to a preset value.

[0096] As explained above, the even-numbered clutches are activated to reduce noise generated during gear shifting. Therefore, once gear shifting is complete, the even-numbered clutches can be controlled to release oil, reducing their actual pressure to a preset value and stopping operation. Considering the potential application scenarios of this invention, the preset value can be 0 or a value very close to 0, without limitation.

[0097] The technical solution of this invention controls the oil filling of even-numbered clutches to make even-numbered clutches work, so as to make the transition from forward drive to reverse drive smooth, thereby effectively reducing the noise generated during gear shifting.

[0098] In an alternative technical solution, where the forward gear is first gear, the aforementioned clutch oil filling control method further includes, before the reverse gear shift fork gradually engages the odd-numbered driveshaft in the dual-clutch transmission:

[0099] Control the oil discharge of the odd-numbered clutches so that the odd-numbered clutches are in the disengaged state;

[0100] The reverse shift fork, which controls the reverse gear, gradually engages with the odd-numbered driveshaft in the dual-clutch transmission, including:

[0101] When the odd-numbered clutches are disengaged, for the odd-numbered drive shaft corresponding to the odd-numbered clutches in the dual-clutch transmission, the first gear shift fork for first gear is disengaged from the odd-numbered drive shaft, and the reverse gear shift fork for reverse gear is gradually engaged onto the odd-numbered drive shaft.

[0102] The above technical solution controls the oil discharge of the odd-numbered clutches to keep them in a disengaged state. Under such conditions, the first gear shift fork can be disengaged from the odd-numbered drive shaft, and the reverse gear shift fork can be gradually engaged onto the odd-numbered drive shaft, thereby achieving effective engagement of the reverse gear shift fork.

[0103] To better understand the various technical solutions described above, specific examples are provided below for illustration. For examples, see [link to example]. Figure 4 The clutch oil filling control process it demonstrates can be divided into the following six stages: rapid oil filling stage, oil filling compensation stage, slow oil filling holding stage, slow oil filling stage, oil filling waiting stage, and oil filling completion stage. Based on this, the gear shifting process is as follows:

[0104] 1. When the driver shifts the gear from first gear to reverse, the TCU detects the shift and controls the odd-numbered clutches containing first and reverse gears to release oil to reduce the actual pressure to 0. This causes the driving and driven friction plates of the odd-numbered clutches to separate, thereby disengaging the engine shaft from the transmission system. Then, the first gear shift fork on the odd-numbered drive shaft is disengaged, and the second gear shift fork on the even-numbered drive shaft is engaged.

[0105] 2. Keep the odd-numbered driveshaft and odd-numbered clutches disengaged, then control the reverse shift fork to engage the odd-numbered driveshaft, while simultaneously controlling the even-numbered clutches to gradually build up pressure to P. Clutch2 This allows it to transmit part of the positive torque, thereby preventing gear grinding noise caused by rapid forward and reverse drive changes in the transmission system due to the dragging characteristics of the odd-numbered clutches when the reverse gear fork is gradually engaged.

[0106] 3. After the reverse gear shift fork is engaged, begin controlling the control pressure of the odd-numbered clutches to fill them with oil;

[0107] 4. During the rapid oil filling stage, set the control pressure P = P1, where P1 is greater than the target pressure P2, and maintain this pressure for a duration (i.e., the first duration) t = t1, so that the oil quickly fills the oil chamber.

[0108] 5. During the oil filling compensation phase, calculate the pressure difference P between the preset pressure P4 applied during the slow oil filling holding phase and the actual pressure P' of the odd-numbered clutches. ERR =P4-P', and according to P ERR By performing closed-loop control on P, the control pressure P = P3 applied in this stage is obtained, and the duration (i.e. the second duration) t = t2 is obtained.

[0109] 6. During the slow oil filling and holding phase, set the control pressure P = P4 and the duration (i.e. the third time interval) t = t3;

[0110] 7. During the slow oil filling stage, set the control pressure P to P4 as the initial pressure, and gradually increase it according to the preset change curve until it increases to P2.

[0111] 8. During the oil filling waiting phase, set the control pressure P = P2, and calculate the pressure difference |P'-P2| between P' and P2 of the odd-numbered clutches in real time. When |P'-P2| < ΔP or the duration of the oil filling waiting phase exceeds the fourth duration t4, exit the oil filling waiting phase.

[0112] 9. During the oil filling stage, the odd-numbered clutches are fully engaged and able to transmit torque normally, indicating that the gear shift is complete. After the odd-numbered clutches have finished oil filling, the speed difference between the driving and driven friction plates of the odd-numbered clutches is calculated based on the engine speed, the transmission output shaft speed, and the reverse gear ratio. When the speed difference is less than the preset value, the gear shift is considered complete, and the actual pressure of the even-numbered clutches is reduced to 0, ending the gear shifting process.

[0113] The above example can simultaneously reduce noise and jerking sensation during gear shifting from forward to reverse, thereby improving the driver's driving experience.

[0114] Figure 5 This is a structural block diagram of a clutch oil filling control device provided in an embodiment of the present invention. This device is used to execute the clutch oil filling control method provided in any of the above embodiments. This device and the clutch oil filling control methods of the above embodiments belong to the same inventive concept. Details not described in detail in the embodiments of the clutch oil filling control device can be found in the embodiments of the clutch oil filling control method described above. See also... Figure 5 The device may specifically include: a clutch oil filling first control module 410, a clutch oil filling second control module 420, a clutch oil filling third control module 430, and a clutch oil filling fourth control module 440.

[0115] The clutch filling control module 410 is used to control the filling of the odd clutch corresponding to the reverse gear in the dual-clutch transmission when the gear is detected to be switched from forward gear to reverse gear, so that the actual pressure of the odd clutch increases and is always less than the preset pressure, wherein the preset pressure is less than the half engagement point pressure of the odd clutch.

[0116] The clutch filling second control module 420 is used to control the filling of odd clutches with oil based on a preset pressure, so that the actual pressure of the odd clutches is always less than the preset pressure and the first pressure difference between the actual pressure and the preset pressure is within a preset first difference range.

[0117] The clutch filling third control module 430 is used to control the filling of odd clutches based on a control pressure that is initially set to a preset pressure and gradually rises to a target pressure according to a preset rising curve, so that the slope of the torque change curve transmitted by the odd clutches is within a preset slope range.

[0118] The fourth control module 440 for clutch filling is used to control the filling of odd-numbered clutches based on the target pressure to complete gear shifting.

[0119] Optionally, the clutch filling first control module 410 may include:

[0120] The clutch filling control unit is used to control the filling of the odd-numbered clutches corresponding to reverse gear in the dual-clutch transmission based on a preset first duration and a first pressure, wherein the first pressure is greater than the target pressure;

[0121] The second pressure obtaining unit is used to perform closed-loop control on the control pressure currently used to control the oil filling of the odd clutches based on the actual pressure of the odd clutches and the preset pressure within a preset second time period, so as to obtain the second pressure.

[0122] The clutch filling control unit is used to control the filling of the odd clutch based on the second pressure, so that the actual pressure of the odd clutch rises within the second time period and is always less than the preset pressure.

[0123] Based on this, optionally, the second pressure obtaining unit may include:

[0124] The second pressure difference determination subunit is used to determine the second pressure difference between the actual pressure of the odd-numbered clutches and the preset pressure.

[0125] The second pressure obtaining sub-unit is used to perform closed-loop control on the current control pressure used to control the oil filling of the odd-numbered clutches based on the second pressure difference, and obtain the second pressure.

[0126] Optionally, the clutch filling second control module 420 includes:

[0127] The clutch filling third control unit is used to control the filling of odd-numbered clutches based on a preset pressure and a preset third duration.

[0128] Optional, the clutch filling fourth control module 440 is specifically used for:

[0129] Based on the target pressure, the odd-numbered clutches are controlled to fill with oil, and during the filling process, a third pressure difference between the actual pressure of the odd-numbered clutches and the target pressure is determined;

[0130] If the third pressure difference is within the preset second difference range, or if the duration of the oil filling process exceeds the preset fourth duration, the gear shift is confirmed to be complete.

[0131] Optionally, the above-mentioned clutch oil filling control device may further include:

[0132] The clutch pressure building module is used to control the reverse gear shift fork to gradually engage the odd-numbered driveshaft in the dual-clutch transmission after detecting a shift from forward to reverse gear, and to control the even-numbered clutches in the dual-clutch transmission to gradually build up pressure during the engagement process.

[0133] The aforementioned clutch oil filling control device may further include:

[0134] The first clutch oil release control module is used to control the oil release of the even clutch after controlling the odd clutch to fill with oil based on the target pressure and after the gear shift is completed, so as to reduce the actual pressure of the even clutch to a preset value.

[0135] Based on this, optionally, with the forward gear being first gear, the aforementioned clutch oil filling control device may further include:

[0136] The second clutch oil drain control module is used to control the oil drain of the odd clutch before the reverse gear shift fork gradually engages the odd drive shaft in the dual-clutch transmission, so that the odd clutch is in a disengaged state.

[0137] The clutch pressure build-up module includes:

[0138] The reverse gear shift fork engagement unit is used to control the first gear shift fork of first gear to disengage from the odd-numbered drive shaft corresponding to the odd-numbered clutch in a dual-clutch transmission when the odd-numbered clutch is disengaged, and to control the reverse gear shift fork of reverse gear to gradually engage with the odd-numbered drive shaft.

[0139] The clutch oil filling control device provided in this embodiment of the invention, through a first clutch oil filling control module, controls the oil filling of the odd-numbered clutches corresponding to reverse gear in the dual-clutch transmission when a gear shift from forward to reverse is detected. This ensures that the actual pressure of the odd-numbered clutches rises but remains below a preset pressure, which is less than the half-engagement point pressure of the odd-numbered clutches. In other words, pressure is established for the odd-numbered clutches while ensuring they transmit little or no torque. A second clutch oil filling control module, based on the preset pressure, controls the oil filling of the odd-numbered clutches to ensure that the actual pressure of the odd-numbered clutches is always less than the preset pressure and falls within a certain range. The first pressure difference is within the preset first difference range, so that the actual pressure of the odd clutch is stable at a level that prevents the odd clutch from transmitting torque or only transmits a very small amount of torque. The third clutch filling control module controls the odd clutch to fill with oil based on the control pressure, which is based on the preset pressure as the initial pressure and gradually rises to the target pressure according to the preset rising curve, so that the slope of the torque change curve transmitted by the odd clutch is within the preset slope range, so that the torque transmitted by the odd clutch rises smoothly. The fourth clutch filling control module controls the odd clutch to fill with oil based on the target pressure to complete the gear shift from forward to reverse. The aforementioned device, after establishing pressure for the odd-numbered clutches, controls the oil filling of the odd-numbered clutches to stabilize their actual pressure below the half-engagement point pressure for a period of time. Then, it continues to control the oil filling of the odd-numbered clutches to allow the torque transmitted by the odd-numbered clutches to rise smoothly, thus completing the gear shift. This solves the problem of rapid torque increase caused by directly raising the actual pressure of the odd-numbered clutches to the target pressure, which leads to vehicle jerking. It ensures the smoothness of the forward-to-reverse gear shifting process.

[0140] The clutch oil filling control device provided in the embodiments of the present invention can execute the clutch oil filling control method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0141] It is worth noting that in the embodiments of the clutch oil filling control device described above, the various units and modules included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of each functional unit are only for easy differentiation and are not used to limit the scope of protection of the present invention.

[0142] Figure 6A schematic diagram of an automatic transmission control unit 10, which can be used to implement embodiments of the present invention, is shown. The automatic transmission control unit is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The automatic transmission control unit can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (such as helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0143] like Figure 6 As shown, the automatic transmission control unit 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer programs stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 can also store various programs and data required for the operation of the automatic transmission control unit 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0144] Multiple components in the automatic transmission control unit 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, optical disk, etc.; and a communication unit 19, such as a network card, modem, wireless transceiver, etc. The communication unit 19 allows the automatic transmission control unit 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0145] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as the clutch oil filling control method.

[0146] In some embodiments, the clutch filling control method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program may be loaded into and / or installed on the automatic transmission control unit 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the clutch filling control method described above may be performed. Alternatively, in other embodiments, processor 11 may be configured to perform the clutch filling control method by any other suitable means (e.g., by means of firmware).

[0147] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0148] Computer programs used to implement the methods of the present invention can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The computer programs can be executed entirely on a machine, partially on a machine, as a standalone software package partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0149] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0150] To provide interaction with the user, the systems and techniques described herein can be implemented on an automatic transmission control unit having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the automatic transmission control unit. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0151] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0152] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0153] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0154] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A clutch oil filling control method, characterized in that, include: When a shift from forward to reverse is detected, the odd-numbered clutches in the dual-clutch transmission corresponding to the reverse gear are controlled to fill with oil, so that the actual pressure of the odd-numbered clutches rises and is always less than a preset pressure, wherein the preset pressure is less than the half-engagement point pressure of the odd-numbered clutches. Based on the preset pressure, the odd-numbered clutches are controlled to fill with oil so that the actual pressure of the odd-numbered clutches is always less than the preset pressure and the first pressure difference between the odd-numbered clutches and the preset pressure is within a preset first difference range. Based on the control pressure that takes the preset pressure as the initial pressure and gradually rises to the target pressure according to the preset rising curve, the odd-numbered clutch is controlled to fill with oil so that the slope of the torque change curve transmitted by the odd-numbered clutch is within the preset slope range. Based on the target pressure, the odd-numbered clutches are controlled to fill with oil to complete gear shifting.

2. The method according to claim 1, characterized in that, The control of the odd-numbered clutches in the dual-clutch transmission corresponding to the reverse gear to fill with oil, so that the actual pressure of the odd-numbered clutches rises and is always less than a preset pressure, includes: Based on a preset first duration and a first pressure, the odd-numbered clutches in the dual-clutch transmission corresponding to the reverse gear are controlled to fill with oil, wherein the first pressure is greater than the target pressure; Within a preset second time period, based on the actual pressure of the odd-numbered clutches and the preset pressure, the control pressure currently used to control the oil filling of the odd-numbered clutches is subjected to closed-loop control to obtain the second pressure; Based on the second pressure, the odd-numbered clutch is controlled to fill with oil so that the actual pressure of the odd-numbered clutch rises within the second time period and is always less than the preset pressure.

3. The method according to claim 2, characterized in that, The second pressure is obtained by performing closed-loop control on the current control pressure used to control the oil filling of the odd-numbered clutches based on the actual pressure of the odd-numbered clutches and the preset pressure, including: Determine a second pressure difference between the actual pressure of the odd-numbered clutches and the preset pressure; Based on the second pressure difference, the control pressure currently used to control the oil filling of the odd-numbered clutches is controlled in a closed loop to obtain the second pressure.

4. The method according to claim 1, characterized in that, The step of controlling the oil filling of the odd-numbered clutches based on the preset pressure includes: Based on the preset pressure and the preset third duration, the odd-numbered clutches are controlled to fill with oil.

5. The method according to claim 1, characterized in that, The step of controlling the oil filling of the odd-numbered clutches based on the target pressure to complete gear shifting includes: Based on the target pressure, the odd-numbered clutches are controlled to fill with oil, and during the oil filling process, a third pressure difference between the actual pressure of the odd-numbered clutches and the target pressure is determined; If the third pressure difference is within the preset second difference range, or if the duration of the oil filling process exceeds the preset fourth duration, the gear shift is determined to be complete.

6. The method according to claim 1, characterized in that, After detecting a shift from forward to reverse gear, the method further includes: The reverse gear shift fork is controlled to gradually engage with the odd-numbered driveshaft in the dual-clutch transmission, and during the gradual engagement process, the even-numbered clutches in the dual-clutch transmission are controlled to gradually build up pressure. After controlling the oil filling of the odd-numbered clutches based on the target pressure, the method further includes: When the gear shift is completed, control the even-numbered clutch to release oil so that the actual pressure of the even-numbered clutch is reduced to a preset value.

7. The method according to claim 6, characterized in that, The forward gear is first gear, and before the reverse gear shift fork controlling the reverse gear gradually engages with the odd-numbered driveshaft in the dual-clutch transmission, the following is also included: Control the oil discharge of the odd-numbered clutches so that the odd-numbered clutches are in a disengaged state; The reverse gear shift fork that controls the reverse gear gradually engages with the odd-numbered driveshaft in the dual-clutch transmission, including: When the odd-numbered clutch is in the disengaged state, for the odd-numbered drive shaft corresponding to the odd-numbered clutch in the dual-clutch transmission, the first gear shift fork of the first gear is controlled to disengage from the odd-numbered drive shaft, and the reverse gear shift fork of the reverse gear is controlled to gradually engage with the odd-numbered drive shaft.

8. A clutch oil filling control device, characterized in that, include: The clutch filling control module is used to control the filling of the odd-numbered clutches corresponding to the reverse gear in the dual-clutch transmission when the gear is detected to have shifted from forward gear to reverse gear, so that the actual pressure of the odd-numbered clutches rises and is always less than a preset pressure, wherein the preset pressure is less than the half-engagement point pressure of the odd-numbered clutches. The clutch filling second control module is used to control the filling of the odd-numbered clutches with oil based on the preset pressure, so that the actual pressure of the odd-numbered clutches is always less than the preset pressure and the first pressure difference between the clutches and the preset pressure is within a preset first difference range. The third control module for clutch filling is used to control the filling of the odd-numbered clutches based on the control pressure which is the initial pressure and gradually rises to the target pressure according to the preset rising curve, so that the slope of the torque change curve transmitted by the odd-numbered clutches is within the preset slope range. The fourth control module for clutch oil filling is used to control the oil filling of the odd-numbered clutches based on the target pressure to complete gear switching.

9. An automatic transmission control unit, characterized in that, include: At least one processor; as well as A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor to cause the at least one processor to perform the clutch oil filling control method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that cause a processor to execute the clutch oil filling control method as described in any one of claims 1-7.

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