CN118088676A

CN118088676A - Clutch oil charge control method and device, automatic gearbox control unit and medium

Info

Publication number: CN118088676A
Application number: CN202410094861.4A
Authority: CN
Inventors: 于天浩; 宁甲奎; 孙飞; 朱桂庆; 赵洪元
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2024-01-23
Filing date: 2024-01-23
Publication date: 2024-05-28

Abstract

The embodiment of the invention discloses a clutch oil charge control method, a clutch oil charge control device, an automatic gearbox control unit and a medium. The method comprises the following steps: in the forward gear-reverse gear switching process, controlling the oil charge of the odd clutch so as to ensure that the actual pressure of the odd clutch rises and is always smaller than a preset pressure, wherein the preset pressure is smaller than the half-junction pressure of the odd clutch; controlling the odd clutch to charge oil based on a preset pressure so that the actual pressure is always smaller than the preset pressure and a first pressure difference value between the actual pressure and the preset pressure is within a first difference value range; controlling the odd clutch to charge oil based on a control pressure which takes a preset pressure as an initial pressure and gradually rises to a target pressure according to a rising curve, so that the slope of a change curve of torque transmitted by the odd clutch is located in a slope range; and controlling the odd clutch to charge oil based on the target pressure so as to complete gear shifting. According to the technical scheme provided by the embodiment of the invention, the vehicle can be prevented from being shrugged in the gear shifting process.

Description

Clutch oil charge control method and device, automatic gearbox control unit and medium

Technical Field

The embodiment of the invention relates to the technical field of automobiles, in particular to a clutch oil filling control method and device, an automatic gearbox control unit and medium.

Background

With the development of automobile technology, automatic transmissions are becoming increasingly popular. Among the various types of automatic transmissions, the dual clutch transmission (Dual Clutch Transmission, DCT) combines the advantages of manual and hydraulic automatic transmissions, and thus is favored by numerous manufacturers and market users.

For the odd drive shafts and the odd clutches responsible for the odd and reverse gears in the DCT, in order to ensure the rapidity of gear shift, when the reverse gear on the odd drive shafts is completely engaged, the automatic transmission control unit (Transmission Control Unit, TCU) controls the odd clutches to start to charge with oil, which results in rapid establishment of odd clutch pressure (i.e., actual pressure of the odd clutches) at this time.

In the process of realizing the invention, the inventor finds that the following technical problems exist in the prior art: the rapid build-up of the odd clutch pressure causes a rapid change in torque transmitted by the odd clutch, further causing the vehicle to shrug during the forward-reverse shift, affecting the driving experience.

Disclosure of Invention

The embodiment of the invention provides a clutch oil charge control method, a device, an automatic gearbox control unit and a medium, which solve the problem of vehicle shrugging in the forward gear-reverse gear switching process.

According to an aspect of the present invention, there is provided a clutch oil charge control method, which may include:

When the gear is detected to be switched from the forward gear to the reverse gear, controlling the odd clutch corresponding to the reverse gear in the double-clutch transmission to charge oil so that the actual pressure of the odd clutch is increased and is always smaller than the preset pressure, wherein the preset pressure is smaller than the half-junction pressure of the odd clutch;

Controlling the odd clutch to be filled with oil based on a preset pressure, so that the actual pressure of the odd clutch is always smaller than the preset pressure and a first pressure difference value between the actual pressure of the odd clutch and the preset pressure is within a preset first difference value range;

Controlling the odd clutch to charge oil based on a control pressure which takes a preset pressure as an initial pressure and gradually rises to a target pressure according to a preset rising curve, so that the slope of a change curve of torque transmitted by the odd clutch is positioned in a preset slope range;

and controlling the odd clutch to charge oil based on the target pressure so as to complete gear shifting.

According to another aspect of the present invention, there is provided a clutch oil charge control device, which may include:

The clutch oil filling first control module is used for controlling the odd clutch oil filling corresponding to the reverse gear in the double-clutch transmission under the condition that the gear is detected to be switched from the forward gear to the reverse gear, so that the actual pressure of the odd clutch is increased and is always smaller than the preset pressure, wherein the preset pressure is smaller than the half-combining point pressure of the odd clutch;

the clutch oil filling second control module is used for controlling the odd clutch to fill oil based on preset pressure, so that the actual pressure of the odd clutch is always smaller than the preset pressure and a first pressure difference value between the odd clutch and the preset pressure is within a preset first difference value range;

The clutch oil filling third control module is used for controlling the odd clutch to fill oil based on the control pressure which takes 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 change curve of the torque transmitted by the odd clutch is positioned in the preset slope range;

And the clutch oil filling fourth control module is used for controlling the odd clutch oil filling based on the target pressure so as to complete gear switching.

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

At least one processor; and

A memory communicatively coupled to the at least one processor; wherein,

The memory stores a computer program executable by the at least one processor, the computer program being executable by the at least one processor to cause the at least one processor to implement the clutch oil fill control method provided by any embodiment of the present invention when executed.

According to another aspect of the present invention, there is provided a computer readable storage medium having stored thereon computer instructions for causing a processor to execute the clutch oil fill control method provided by any of the embodiments of the present invention.

According to the technical scheme, under the condition that the gear is detected to be switched from the forward gear to the reverse gear, the odd clutch corresponding to the reverse gear in the double-clutch transmission is controlled to be filled with oil, so that the actual pressure of the odd clutch is increased and is always smaller than the preset pressure, the preset pressure is smaller than the half-junction pressure of the odd clutch, namely, the pressure is established for the odd clutch on the premise that the odd clutch can not transmit torque or can only transmit small torque; controlling the oil charge of the odd clutch based on the preset pressure, so that the actual pressure of the odd clutch is always smaller than the preset pressure and the first pressure difference between the actual pressure of the odd clutch and the preset pressure is within a preset first difference range, namely, the actual pressure of the odd clutch is stabilized under the condition that the odd clutch can not transmit torque or can only transmit small torque; controlling the odd clutch to charge oil based on a control pressure which takes the preset pressure as an initial pressure and gradually rises to a target pressure according to a preset rising curve, so that the slope of a change curve of the torque transmitted by the odd clutch is positioned in a preset slope range, namely, the torque transmitted by the odd clutch steadily rises; and controlling the odd clutch to be filled with oil based on the target pressure so as to complete the gear switching of the forward gear and the reverse gear. According to the technical scheme, after the pressure is built for the odd clutch, the odd clutch is controlled to be filled with oil so that the actual pressure of the odd clutch is stabilized below the half-junction pressure for a period of time, and then the odd clutch is continuously controlled to be filled with oil so that the torque transmitted by the odd clutch is stably increased on the basis of the pressure, and gear switching is completed, so that the problem that the torque transmitted by the odd clutch is rapidly increased due to the fact that the actual pressure of the odd clutch is directly increased to the target pressure, and further the vehicle is driven is solved, and smoothness of the forward gear-reverse gear switching process is guaranteed.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention, nor is it intended to be used to limit the scope of the invention. Other features of the present invention will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a flow chart of a clutch oil fill control method provided in accordance with an embodiment of the present invention;

FIG. 2 is a flow chart of another clutch oil fill control method provided in accordance with an embodiment of the present invention;

FIG. 3 is a flow chart of yet another clutch oil fill control method provided in accordance with an embodiment of the present invention;

FIG. 4 is a schematic illustration of a variation in control pressure for controlling odd clutch fill in yet another clutch fill control method provided in accordance with an embodiment of the present invention;

FIG. 5 is a block diagram of a clutch oil fill control device according to an embodiment of the present invention;

fig. 6 is a schematic structural view of an automatic transmission control unit implementing a clutch oil charge control method according to an embodiment of the present invention.

Detailed Description

In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. The cases of "target", "original", etc. are similar and will not be described in detail herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Before describing the embodiment of the present invention, the reason for the problem of vehicle shrugging during the forward gear-reverse gear shift described in the background art will be described in detail for better understanding the reason why the clutch oil charge control scheme provided by the embodiment of the present invention can solve the problem.

For example, a Dual Clutch Transmission (DCT), i.e., a wet DCT, may include an odd clutch responsible for odd forward gears such as first, third and fifth gears and reverse gears, and an even clutch responsible for even forward gears such as second, fourth and sixth gears.

The half-tie-point pressure may be understood as the actual pressure of the odd clutch (i.e., the tie-up pressure) when the driving and driven friction plates of the odd clutch are in a half-tie state. It should be noted that, during the process of combining the driving friction plate and the driven friction plate, the torque transmission capacity of the odd clutch does not change linearly with the combination pressure. Typically, when the engagement pressure is less than the half engagement point pressure, the torque transmitted by the odd clutch approaches 0; on the other hand, the torque transmitted by the odd clutch varies according to the clutch gain, and is rapidly variable, for example, from a small value to about 10nm (n·m).

On this basis, it is further noted that this rapidly changing torque can cause the vehicle to towering. This vehicle cocking phenomenon gives the driver limited feeling of cocking when the vehicle is in a running state. However, when the vehicle is in a substantially stationary state during the shift from the forward gear to the reverse gear, the vehicle tows to provide a relatively noticeable towering feel to the driver. Therefore, in order to secure the driving experience of the driver, this torque transmitting process of the odd clutch needs to be controlled.

On the basis, it should be further noted that the torque transmitted by the odd clutch can be controlled by controlling the oil filling and draining of the odd clutch, so the following embodiments provide corresponding clutch oil filling control schemes, so that the torque transmission process of the odd clutch is controlled, and the vehicle dynamic phenomenon caused by torque switching in the forward gear-reverse gear shifting process is eliminated, so that the shifting process is smoother.

Next, this will be explained in detail.

Fig. 1 is a flowchart of a clutch oil filling control method according to an embodiment of the present invention. The embodiment is applicable to the situation that the odd clutch is filled with oil to complete gear shifting in the forward gear-reverse gear switching process, and is particularly applicable to the situation that the odd clutch is filled with oil with the aim of ensuring stable change of torque transmitted by the odd clutch. The method may be performed by a clutch oil fill control device provided by an embodiment of the present invention, which may be implemented in software and/or hardware, which may be integrated on an automatic Transmission Control Unit (TCU).

Referring to fig. 1, the method of the embodiment of the present invention specifically includes the following steps:

S110, under the condition that the gear is detected to be switched from the forward gear to the reverse gear, controlling the odd clutch corresponding to the reverse gear in the dual clutch transmission to charge oil so that the actual pressure of the odd clutch is increased and is always smaller than the preset pressure, wherein the preset pressure is smaller than the half-junction pressure of the odd clutch.

The predetermined pressure is understood to be a pressure predetermined according to the half-junction pressure of the odd clutch, in particular a pressure which is smaller than the half-junction pressure, i.e. a pressure which does not substantially cause the odd clutch to transmit torque or which transmits only a small torque. In practical application, optionally, the torque transmission characteristics of different vehicles can be comprehensively analyzed, and the preset pressure is set, so that the preset pressure applicable to various vehicles is obtained.

Under the condition that the gear is detected to be switched from the forward gear to the reverse gear, particularly the gear is detected to be switched from the first gear in the forward gear to the reverse gear, the odd clutch is controlled to be filled with oil, so that the driving friction plate and the driven friction plate of the odd clutch are gradually combined, the actual pressure of the odd clutch is continuously increased and is always lower than the preset pressure, and the torque transmitted by the odd clutch is prevented from being changed rapidly.

S120, controlling the odd clutch to charge oil based on the preset pressure, so that the actual pressure of the odd clutch is always smaller than the preset pressure and a first pressure difference value between the actual pressure of the odd clutch and the preset pressure is within a preset first difference value range.

The first pressure difference is understood to be the difference between the actual pressure and the predetermined pressure. On the basis of this, optionally, in the current phase, the first pressure difference may be represented by a preset pressure-the actual pressure, since the actual pressure is always smaller than the preset pressure. The first differential range is understood to be a predetermined range of values associated with the first differential pressure, in particular a range in which the value is small, so that the first differential pressure lying within the first differential range is in a steady state.

In view of the response delay of the hydraulic system, in order to avoid the phenomenon that the odd clutch rapidly builds up pressure to cause the vehicle to rise, a slow oil charge holding stage as shown in this step is provided, so that the actual pressure of the odd clutch can be stabilized at a value that does not substantially allow the odd clutch to transmit torque or only transmits a small torque. Specifically, the odd clutch may be controlled to be filled with oil based on the preset pressure, so that the actual pressure of the odd clutch is always smaller than the preset pressure and the first pressure difference between the odd clutch and the preset pressure is within the first difference range, so that the actual pressure of the odd clutch is stabilized below the half-junction pressure for a period of time, which is helpful for effectively eliminating the vehicle cocking phenomenon caused by too fast filling of the odd clutch.

In addition, it should be noted that another benefit of stabilizing the actual pressure of the odd clutch below and near the preset pressure is that the slow oil filling stage at S130 can be provided with a controllable initial pressure (i.e., the preset pressure) so that the oil filling control at this stage is significant.

S130, controlling the oil charge of the odd clutch based on the control pressure which takes 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 change curve of the torque transmitted by the odd clutch is located in the preset slope range.

The target pressure is understood to be the pressure that the actual pressure of the odd clutch eventually needs to reach in order to complete the shift process. The control pressure in this step may be understood as a pressure that gradually increases to the target pressure in accordance with an increasing curve with the preset pressure as the initial pressure. The rising curve is understood to mean a preset curve which characterizes the rising pattern of the control pressure, in particular a compensation curve which is produced as a function of the characteristics of the hydraulic system, under the control of which the torque transmitted by the odd clutch rises steadily.

The change curve may characterize the change in torque transmitted by the odd clutch during the control of the odd clutch fill based on the control pressure described above. The slope is understood to be the slope of each point on the change curve, which may reflect how fast the torque transmitted by the odd clutch changes at the corresponding point. The slope range is understood to be a range which is preset in relation to the slope, in particular a range in which the value is small.

In particular, so far, the odd clutch has built up pressure and is held for a period of time, which allows the actual pressure of the odd clutch to better follow the control pressure. On the basis of this, the odd clutch oil charge can be controlled based on the control pressure which is set at the preset pressure and gradually rises in accordance with the rising curve, so that the actual pressure of the odd clutch obtained under such oil charge control can bring the slope of the change curve of the torque transmitted by the odd clutch within the slope range, i.e., the change curve of the torque transmitted by the odd clutch is smooth and not fluctuated, which means that the torque transmitted by the odd clutch rises smoothly and not rapidly, whereby the vehicle hunting phenomenon can be avoided.

S140, controlling the odd clutch to charge oil based on the target pressure so as to complete gear switching.

Wherein, as set forth above, the target pressure is the pressure that the actual pressure of the odd clutch will eventually reach in order to complete the shift process. Therefore, the odd clutch may be controlled to fill with oil based on the target pressure, thereby allowing the actual pressure of the odd clutch to reach the target pressure, completing the forward-reverse shift process.

In practical applications, optionally, the stages at which this step is performed may include an oil-filled waiting stage and an oil-filled finishing stage. Specifically, the oil-filling waiting period is set to avoid that the actual pressure of the odd clutch fails to accurately follow the control pressure for controlling the oil filling of the odd clutch, so that the accuracy of the actual pressure control can be ensured by executing the oil-filling waiting period. Optionally, when the pressure difference between the actual pressure and the target pressure is smaller than the set value, the oil filling waiting stage can be exited, and the oil filling completion stage can be entered. And in the oil filling completion stage, the odd clutch is completely attached and can normally transmit torque, and the gear switching is completed at the moment.

An alternative solution for controlling oil filling of an odd clutch, comprising:

And controlling the odd clutch to charge oil based on the preset pressure and the preset third duration.

The third duration may be understood as a preset duration that characterizes the odd clutch oil charge during the slow oil charge hold phase. And controlling the odd clutch to charge oil based on the preset pressure and the third duration.

The application of the third duration can avoid the situation that the slow oil charge maintaining stage cannot be finished, thereby ensuring the smooth completion of gear switching.

Another alternative solution, based on a target pressure, controls the odd clutch to be filled with oil to complete the gear shift, includes:

Controlling the odd clutch to charge oil based on the target pressure, and determining a third pressure difference between the actual pressure of the odd clutch and the target pressure during the oil charge;

And determining that gear switching is completed when the third pressure difference is within a preset second difference range or the duration of the oil filling process exceeds a preset fourth duration.

The third pressure difference may be understood as the difference between the actual pressure of the odd clutch and the target pressure. It will be appreciated that as the filling process progresses, the actual pressure of the odd clutch may change continuously, which may also change the third pressure differential determined during the filling process.

The second difference range is understood to be a preset range associated with the third pressure difference, in particular a range in which the value is small. And under the condition that the third pressure difference is in the second difference range, the actual pressure of the odd clutch is basically the target pressure, namely the driving friction plate and the driven friction plate of the odd clutch are basically in a combined state, oil charge is not needed to be carried out on the odd clutch, and gear switching is completed.

Of course, in order to avoid a situation that the gear shift cannot be completed due to the fact that the actual pressure of the odd clutch is not leveled with the target pressure, the odd clutch may be stopped to continue to be filled with oil when the duration of the oil filling process exceeds the preset fourth duration, and the gear shift is considered to be completed.

The technical scheme ensures the smooth completion of gear switching from different aspects.

FIG. 2 is a flow chart of another clutch fill control method provided in an embodiment of the present invention. The present embodiment is optimized based on the above technical solutions. In this embodiment, optionally, controlling oil filling of the odd clutch corresponding to the reverse gear in the dual clutch transmission so that the actual pressure of the odd clutch rises and is always smaller than the preset pressure includes: controlling oil filling of an odd clutch 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; in a preset second duration, based on the actual pressure and the preset pressure of the odd clutch, performing closed-loop control on the control pressure for controlling the oil charge of the odd clutch to obtain a second pressure; the odd clutch is controlled to be filled with oil based on the second pressure, so that the actual pressure of the odd clutch rises in the second time period and is always smaller than the preset pressure. Wherein, the explanation of the same or corresponding terms as the above embodiments is not repeated herein.

Referring to fig. 2, the method of this embodiment may specifically include the following steps:

S210, under the condition that the gear is detected to be switched from the forward gear to the reverse gear, oil filling of an odd clutch corresponding to the reverse gear in the dual clutch transmission is controlled based on a preset first duration and a first pressure, wherein the first pressure is larger than a target pressure.

The stage in this step is a fast oil filling stage, and the first duration may be understood as a preset duration for characterizing a duration for filling the odd clutch with oil in the fast oil filling stage. And controlling the odd clutch to charge oil based on a first pressure greater than the target pressure during a first period. The application of the first pressure can realize the rapid oil filling of the odd clutch, so that the pressure can be rapidly built up for the odd clutch, and the response time of the actual pressure of the odd clutch reaching the target pressure is shortened.

S220, performing closed-loop control on the control pressure for controlling the oil filling of the odd clutch based on the actual pressure and the preset pressure of the odd clutch in a preset second time period to obtain a second pressure, wherein the preset pressure is smaller than the half-junction pressure of the odd clutch.

The phase in this step is an oil-filling compensation phase, and the second duration may be understood as a preset duration for characterizing a duration for filling the odd clutch with oil in the oil-filling compensation phase.

Because the quick oil filling stage is open-loop oil filling, the phenomenon of over-filling or insufficient oil filling is easy to cause according to the different characteristics of a hydraulic system, the pressure closed-loop control can be carried out according to the actual pressure and the target pressure of the odd clutch, and the oil filling of the odd clutch is controlled on the basis, so that the oil filling compensation is completed.

Specifically, in the second period corresponding to the oil filling compensation stage, the control pressure for controlling the oil filling of the odd clutch at the current moment can be closed-loop controlled based on the actual pressure and the preset pressure of the odd clutch, so as to obtain the second pressure for controlling the oil filling of the odd clutch at the next moment at the current moment, wherein the second pressure is the control pressure at the next moment.

S230, controlling the odd clutch to charge oil based on the second pressure so that the actual pressure of the odd clutch rises in the second time period and is always smaller than the preset pressure.

Wherein the odd clutch is controlled to be filled with oil based on the second pressure, specifically, when the next time becomes the current time, the odd clutch is controlled to be filled with oil based on the second pressure.

During the second period, S220 and S230 are repeatedly performed, so that the odd clutch is charged with oil for the second period, so that the actual pressure of the odd clutch continuously rises and is always smaller than the preset pressure.

S240, controlling the odd clutch to charge oil based on the preset pressure, so that the actual pressure of the odd clutch is always smaller than the preset pressure and a first pressure difference value between the actual pressure of the odd clutch and the preset pressure is within a preset first difference value range.

S250, controlling the oil charge of the odd clutch based on the control pressure which takes 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 change curve of the torque transmitted by the odd clutch is located in the preset slope range.

S260, controlling the odd clutch to charge oil based on the target pressure so as to complete gear switching.

According to the technical scheme, in the oil filling compensation stage, the control pressure for controlling the oil filling of the odd clutch is subjected to closed-loop control, so that the over-filling or the insufficient oil filling generated in the quick oil filling stage is effectively compensated, and the effective follow-up oil filling control is ensured.

An optional technical solution, based on an actual pressure and a preset pressure of the odd clutch, performs closed-loop control on a control pressure currently used for controlling oil filling of the odd clutch to obtain a second pressure, including:

Determining a second pressure difference between the actual pressure of the odd clutch and a preset pressure;

And performing closed-loop control on the control pressure for controlling the oil filling of the odd clutch according to the second pressure difference value to obtain the second pressure.

According to the technical scheme, the control pressure is subjected to closed-loop control through the second pressure difference value, so that the actual pressure of the odd clutch is closer to the preset pressure after the odd clutch is controlled to charge oil based on the control pressure after closed-loop control, and the subsequent smooth operation of the slow oil charge maintaining stage is ensured.

FIG. 3 is a flow chart of yet another clutch oil fill control method provided in an embodiment of the present invention. The present embodiment is optimized based on the above technical solutions. In this embodiment, optionally, after detecting that the gear is shifted from the forward gear to the reverse gear, the method for controlling oil filling of the clutch further includes: the reverse shift fork for controlling the reverse gear is gradually hung into an odd transmission shaft in the double-clutch transmission, and in the gradual hanging process, the even clutch in the double-clutch transmission is controlled to gradually build pressure; after controlling the odd clutch charge based on the target pressure, the clutch charge control method may further include: and under the condition that the gear shifting is completed, controlling the even clutch to drain so as to reduce the actual pressure of the even clutch to a preset value. The same or corresponding terms as those of the above embodiments are not repeated herein.

Referring to fig. 3, the method of this embodiment may specifically include the following steps:

S310, under the condition that the gear is detected to be switched from the forward gear to the reverse gear, controlling a reverse gear shifting fork of the reverse gear to gradually engage with an odd-numbered drive shaft in the dual-clutch transmission, and controlling an even-numbered clutch in the dual-clutch transmission to gradually build pressure in the gradual engagement process.

The reverse gear shifting fork is understood to be a shifting fork corresponding to the reverse gear. An odd drive shaft can be understood as a drive shaft in the DCT that works in conjunction with an odd clutch; accordingly, an even drive shaft may be understood as a drive shaft in the DCT that cooperates with an even clutch.

In order to shift from the forward gear to the reverse gear, the reverse gear fork may be controlled to gradually engage the odd-numbered drive shafts. In the gradual engaging process, the even clutch can be controlled to gradually build pressure, so that the forward torque of the even clutch transmission part, especially the forward torque of the even transmission shaft transmitted to the output shaft, is larger than the reverse torque of the odd transmission shaft positioned in the reverse gear and transmitted to the output shaft, the engaged reverse gear can be always in a forward rotation trend, and noise caused by engaging the reverse gear fork in the gear shifting process can be effectively reduced.

S320, controlling the odd clutch corresponding to the reverse gear in the dual clutch transmission to be filled with oil, so that the actual pressure of the odd clutch is increased and is always smaller than the preset pressure, wherein the preset pressure is smaller than the half-junction pressure of the odd clutch.

S330, oil filling of the odd clutch is controlled based on the preset pressure, so that the actual pressure of the odd clutch is always smaller than the preset pressure and a first pressure difference value between the actual pressure and the preset pressure is within a preset first difference value range.

S340, controlling the oil charge of the odd clutch based on the control pressure which takes 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 change curve of the torque transmitted by the odd clutch is located in the preset slope range.

On the basis of S310, the engaged reverse gear is always in a forward rotation trend, so that noise caused by the engagement of the reverse gear shifting fork in a gear shifting process is effectively reduced. On the basis, by combining S330 and S340, the torque transmitted by the odd clutch can be stably increased, compared with the rapid increase, the rapid transition of the transmission system from the forward rotation trend to the reverse rotation trend can be avoided, and the vehicle can be prevented from being shrugged.

S350, controlling the odd clutch to charge oil based on the target pressure so as to complete gear switching.

S360, under the condition that gear switching is completed, oil drainage of the even clutch is controlled, so that the actual pressure of the even clutch is reduced to a preset value.

Wherein it is apparent from the above description that the even clutch is activated for reducing noise generated during the gear shift. Therefore, under the condition that the gear switching is completed, the even clutch can be controlled to drain so as to reduce the actual pressure of the even clutch to a preset value and stop working. In connection with the application scenario possibly related to the embodiment of the present invention, the preset value may be 0 or a value very close to 0, which is not limited.

According to the technical scheme, the even clutch is controlled to be filled with oil, so that the even clutch works, the transition from positive driving to reverse driving is smooth, and noise generated in the gear switching process is effectively reduced.

An optional technical scheme, the forward gear is a first gear, and before a reverse gear shifting fork for controlling the reverse gear is gradually engaged with an odd-numbered drive shaft in the dual clutch transmission, the clutch oil charge control method further comprises the following steps:

Controlling the odd clutch to drain so that the odd clutch is in a separation state;

The reverse shift fork of control reverse gear is hung into the odd numbered transmission shaft in the dual clutch transmission gradually, include:

under the condition that the odd clutch is in a separation state, aiming at an odd transmission shaft corresponding to the odd clutch in the double-clutch transmission, a first-gear shifting fork for controlling a first gear is taken off from the odd transmission shaft, and a reverse-gear shifting fork for controlling a reverse gear is gradually hung on the odd transmission shaft.

According to the technical scheme, the odd clutch is in the separation state by controlling the oil drainage of the odd clutch, under the condition, the first-gear shifting fork can be controlled to be pulled off from the odd transmission shaft, and the reverse-gear shifting fork is controlled to be gradually hung on the odd transmission shaft, so that the effective hanging of the reverse-gear shifting fork is realized.

In order to better understand the above-described respective technical solutions as a whole, an exemplary description thereof is given below in conjunction with specific examples. For example, referring to FIG. 4, the clutch fill control process illustrated may be divided into six phases: a fast oil filling stage, an oil filling compensation stage, a slow oil filling maintaining stage, a slow oil filling stage, an oil filling waiting stage and an oil filling completion stage. On the basis, the gear switching process is as follows:

1. The driver switches the gear from the first gear to the reverse gear, the TCU detects that the gear is switched from the first gear to the reverse gear, and then the odd clutch where the first gear and the reverse gear are positioned is controlled to discharge oil to reduce the actual pressure to 0, so that the driving friction plate and the driven friction plate of the odd clutch are separated, the engine rotating shaft is further separated from the transmission system, then the first gear shifting fork on the odd transmission shaft is disengaged, and the second gear shifting fork on the even transmission shaft is engaged;

2. the odd transmission shaft keeps the odd clutch in a separation state, then the reverse gear shifting fork is controlled to start to be hung into the odd transmission shaft, and meanwhile the even clutch is controlled to gradually build pressure to P _Clutch2, so that partial forward torque is transmitted, and tooth striking noise caused by rapid forward and reverse driving change of the transmission system due to the dragging characteristic of the odd clutch is prevented when the reverse gear shifting fork is gradually hung;

3. after the reverse shift fork is completely hung in, starting to control the control pressure of the odd clutch to charge oil;

4. In the quick oil filling stage, the control pressure P=P ₁,P₁ is higher than the target pressure P ₂, the maintaining time (namely the first time length) t=t1, and the oil is quickly filled in the oil cavity;

5. In the oil charge compensation stage, calculating a pressure difference value P _ERR =P4-P 'between the preset pressure P ₄ applied in the slow oil charge maintaining stage and the actual pressure P' of the odd clutch, and performing closed-loop control on P according to P _ERR to obtain a control pressure P=P ₃ applied in the stage, wherein the duration (namely the second duration) t=t2;

6. during the slow oil charge hold phase, let the control pressure p=p ₄, duration (i.e. third duration) t=t3;

7. In the slow oil filling stage, the control pressure P takes P ₄ as an initial pressure, and gradually rises along with a preset change curve until the control pressure P is increased to P ₂;

8. In the oil filling waiting period, the control pressure P=P ₂ is controlled, the pressure difference value |P ' -P2|betweenP ' and P ₂ of the odd clutch is calculated in real time until the |P ' -P2| < delta P or the duration of the oil filling waiting period exceeds the fourth time t4, and the oil filling waiting period is exited;

9. and in the oil filling completion stage, the odd clutch is completely engaged and can normally transmit torque, and the gear switching completion is marked. And (3) when the oil filling of the odd clutch is completed, calculating the rotation speed difference between the main friction plate and the auxiliary friction plate of the odd clutch according to the rotation speed of the engine, the rotation speed of the output shaft of the transmission and the reverse gear transmission ratio, and when the rotation speed difference is smaller than a preset value, judging that the gear switching is completed, controlling the actual pressure drop of the even clutch to be 0, and ending the gear shifting process.

In the above example, noise and a feeling of cocking in the shift of forward gear-reverse gear can be reduced at the same time, thereby improving the driving experience of the driver.

Fig. 5 is a block diagram of a clutch oil filling control device according to an embodiment of the present invention, where the device is configured to execute the clutch oil filling control method according to any of the foregoing embodiments. The device and the clutch oil filling control method of each embodiment belong to the same invention conception, and reference can be made to the embodiment of the clutch oil filling control method for details which are not described in detail in the embodiment of the clutch oil filling control device. Referring to fig. 5, the apparatus may specifically include: a first clutch oil charge control module 410, a second clutch oil charge control module 420, a third clutch oil charge control module 430, and a fourth clutch oil charge control module 440.

The clutch oil filling first control module 410 is configured to control, when it is detected that a gear is shifted from a forward gear to a reverse gear, filling oil into an odd clutch corresponding to the reverse gear in the dual clutch transmission, so that an actual pressure of the odd clutch rises and is always smaller than a preset pressure, where the preset pressure is smaller than a half-junction pressure of the odd clutch;

The clutch oil charging second control module 420 is configured to control the odd clutch oil charging based on a preset pressure, so that an actual pressure of the odd clutch is always smaller than the preset pressure and a first pressure difference between the odd clutch and the preset pressure is within a preset first difference range;

The clutch oil filling third control module 430 is configured to control the odd clutch oil filling based on a control pressure that takes a preset pressure as an initial pressure and gradually rises to a target pressure according to a preset rising curve, so that a slope of a change curve of torque transmitted by the odd clutch is located in a preset slope range;

the clutch oil-filled fourth control module 440 is configured to control the odd clutch oil-filled based on the target pressure to complete the gear shift.

Optionally, the clutch oil-filled first control module 410 may include:

the clutch oil filling first control unit is used for controlling oil filling of odd clutches corresponding to reverse gears in the double-clutch transmission based on a preset first duration and a first pressure, wherein the first pressure is larger than a target pressure;

The second pressure obtaining unit is used for performing closed-loop control on the control pressure for controlling the oil filling of the odd clutch based on the actual pressure and the preset pressure of the odd clutch in a preset second time period to obtain the second pressure;

And the clutch oil filling second control unit is used for controlling the odd clutch to fill oil based on the second pressure so that the actual pressure of the odd clutch rises in the second time period and is always smaller than the preset pressure.

On this basis, optionally, the second pressure obtaining unit may include:

A second pressure difference determining sub-unit for determining a second pressure difference between an actual pressure of the odd clutch and a preset pressure;

And the second pressure obtaining subunit is used for carrying out closed-loop control on the control pressure for controlling the oil filling of the odd clutch according to the second pressure difference value to obtain the second pressure.

Optionally, the clutch oil filled second control module 420 includes:

And the clutch oil filling third control unit is used for controlling the odd clutch oil filling based on the preset pressure and the preset third duration.

Optionally, the clutch oil-filled fourth control module 440 is specifically configured to:

Optionally, the clutch oil filling control device may further include:

the clutch pressure building module is used for controlling a reverse shift fork of the reverse gear to gradually engage with an odd-numbered transmission shaft in the double-clutch transmission after detecting that the gear is switched from the forward gear to the reverse gear, and controlling an even-numbered clutch in the double-clutch transmission to gradually build pressure in the gradual engagement process;

The clutch oil charge control device may further include:

And the clutch oil drainage first control module is used for controlling the even clutch to drain oil under the condition that the gear switching is completed after controlling the odd clutch to charge oil based on the target pressure so as to reduce the actual pressure of the even clutch to a preset value.

On this basis, optionally, the forward gear is a first gear, and the clutch oil filling control device may further include:

the clutch oil drainage second control module is used for controlling the oil drainage of the odd clutch before a reverse gear shifting fork for controlling the reverse gear is gradually hung on an odd transmission shaft in the double-clutch transmission so as to enable the odd clutch to be in a separation state;

A clutch pressure establishment module comprising:

The reverse gear shifting fork engaging unit is used for controlling the first gear shifting fork of the first gear to be disengaged from the odd-numbered transmission shaft aiming at the odd-numbered transmission shaft corresponding to the odd-numbered clutch in the double-clutch transmission under the condition that the odd-numbered clutch is in a separation state, and controlling the reverse gear shifting fork of the reverse gear to be gradually engaged on the odd-numbered transmission shaft.

According to the clutch oil filling control device provided by the embodiment of the invention, through the clutch oil filling first control module, under the condition that the gear is detected to be switched from the forward gear to the reverse gear, the odd clutch oil filling corresponding to the reverse gear in the double-clutch transmission is controlled, so that the actual pressure of the odd clutch is increased and is always smaller than the preset pressure, and the preset pressure is smaller than the half-junction pressure of the odd clutch, namely, the pressure is built for the odd clutch on the premise that the odd clutch can not transmit torque or can only transmit very small torque; the clutch oil filling second control module is used for controlling the odd clutch to fill oil based on preset pressure, so that the actual pressure of the odd clutch is always smaller than the preset pressure and a first pressure difference value between the odd clutch and the preset pressure is within a preset first difference value range, namely, the actual pressure of the odd clutch is stabilized under the condition that the odd clutch cannot transmit torque or only can transmit small torque; the third control module for filling oil of the clutch is used for controlling the oil filling of the odd clutch based on the control pressure which takes 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 change curve of the torque transmitted by the odd clutch is positioned in the preset slope range, namely the torque transmitted by the odd clutch steadily rises; and controlling the odd clutch to charge oil based on the target pressure by a clutch oil charging fourth control module so as to complete gear switching of forward gear and reverse gear. According to the device, after the pressure is built for the odd clutch, the odd clutch is controlled to be filled with oil so that the actual pressure of the odd clutch is stabilized below the half-junction pressure for a period of time, and then the odd clutch is continuously controlled to be filled with oil so that the torque transmitted by the odd clutch is stably increased on the basis of the pressure, and gear switching is completed, so that the problem that the torque transmitted by the odd clutch is rapidly increased due to the fact that the actual pressure of the odd clutch is directly increased to the target pressure, and then the vehicle is driven is solved, and smoothness of the forward gear-reverse gear switching process is guaranteed.

The clutch oil filling control device provided by the embodiment of the invention can execute the clutch oil filling control method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.

It should be noted that, in the embodiment of the clutch oil filling control device, each unit and module included are only divided according to the functional logic, but not limited to the above-mentioned division, so long as the corresponding functions can be implemented; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.

Fig. 6 shows a schematic structural diagram of an automatic transmission control unit 10 that can be used to implement an embodiment of the present invention. Automatic transmission control units are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The automatic gearbox control unit may also represent various forms of mobile devices such as personal digital assistants, cellular telephones, smart phones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the inventions described and/or claimed herein.

As shown in fig. 6, the automatic transmission control unit 10 includes at least one processor 11, and a memory such as a Read Only Memory (ROM) 12, a Random Access Memory (RAM) 13, etc. communicatively connected to the at least one processor 11, wherein the memory stores a computer program executable by the at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the Read Only Memory (ROM) 12 or the computer program loaded from the storage unit 18 into the Random Access Memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the automatic transmission control unit 10 may also be stored. The processor 11, the ROM 12 and the RAM 13 are connected to each other via a bus 14. An input/output (I/O) interface 15 is also connected to bus 14.

Various 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, a mouse, etc.; an output unit 17 such as various types of displays, speakers, and the like; a storage unit 18 such as a magnetic disk, an optical disk, or the like; and a communication unit 19 such as a network card, modem, wireless communication transceiver, etc. The communication unit 19 allows the automatic transmission control unit 10 to exchange information/data with other devices through a computer network such as the internet and/or various telecommunication networks.

The processor 11 may be a variety of general and/or special purpose processing components having 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 specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 11 performs the various methods and processes described above, such as the clutch fill control method.

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

Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.

A computer program for carrying out methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.

In the context of the present invention, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

To provide for interaction with a user, the systems and techniques described here 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 a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the automatic transmission control unit. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.

The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.

The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.

It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.

The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims

1. A clutch oil charge control method, comprising:

when the gear is detected to be switched from the forward gear to the reverse gear, controlling an odd clutch corresponding to the reverse gear in the dual clutch transmission to charge oil so that the actual pressure of the odd clutch is increased and is always smaller than a preset pressure, wherein the preset pressure is smaller than the half-junction pressure of the odd clutch;

Controlling the odd clutch to be filled with oil based on the preset pressure, so that the actual pressure of the odd clutch is always smaller than the preset pressure and a first pressure difference value between the actual pressure and the preset pressure is within a preset first difference value range;

Controlling the odd clutch to charge oil based on a control pressure which takes the preset pressure as an initial pressure and gradually rises to a target pressure according to a preset rising curve, so that the slope of a change curve of torque transmitted by the odd clutch is positioned in a preset slope range;

and controlling the odd clutch to charge oil based on the target pressure so as to complete gear switching.

2. The method of claim 1, wherein controlling the odd clutch of the dual clutch transmission corresponding to the reverse gear to be filled with oil such that an actual pressure of the odd clutch rises and is always less than a preset pressure, comprises:

controlling oil filling of an odd clutch corresponding to the reverse gear in a dual clutch transmission based on a preset first duration and a first pressure, wherein the first pressure is greater than the target pressure;

Performing closed-loop control on the control pressure for controlling the oil charge of the odd clutch based on the actual pressure of the odd clutch and the preset pressure within a preset second time period to obtain a second pressure;

and controlling the odd clutch to be filled with oil based on the second pressure so that the actual pressure of the odd clutch rises in the second time period and is always smaller than a preset pressure.

3. The method of claim 2, wherein the closed-loop controlling the control pressure for controlling the odd clutch charge based on the actual pressure of the odd clutch and the preset pressure to obtain a second pressure includes:

Determining a second pressure difference between the actual pressure of the odd clutch and the preset pressure;

and performing closed-loop control on the current control pressure for controlling the oil filling of the odd clutch according to the second pressure difference value to obtain a second pressure.

4. The method of claim 1, wherein said controlling said odd clutch charge based on said preset pressure comprises:

And controlling the odd clutch to be filled with oil based on the preset pressure and the preset third duration.

5. The method of claim 1, wherein said controlling said odd clutch charge to complete a gear shift based on said target pressure comprises:

controlling the odd clutch to fill with oil based on the target pressure, and determining a third pressure difference between the actual pressure of the odd clutch and the target pressure during the filling;

and determining that the gear switching is completed when the third pressure difference value is within a preset second difference value range or the duration of the oil filling process exceeds a preset fourth duration.

6. The method according to claim 1, further comprising, after said detecting a shift from forward to reverse, the steps of:

the reverse shifting fork for controlling the reverse gear is gradually hung into an odd transmission shaft in the double-clutch transmission, and in the gradual hanging process, the even clutch in the double-clutch transmission is controlled to gradually build pressure;

After said controlling said odd clutch charge based on said target pressure, further comprising:

And under the condition that the gear switching is completed, controlling the even clutch to drain oil so as to reduce the actual pressure of the even clutch to a preset value.

7. The method of claim 6, wherein the forward gear is a first gear, further comprising, prior to the reverse shift fork controlling the reverse gear gradually engaging an odd drive shaft in the dual clutch transmission:

The reverse shift fork for controlling the reverse gear is gradually engaged with an odd-numbered drive shaft in the dual clutch transmission, and includes:

Under the condition that the odd clutch is in a separation state, aiming at an odd transmission shaft corresponding to the odd clutch in the double-clutch transmission, a first-gear shifting fork of the first gear is controlled to be separated from the odd transmission shaft, and a reverse-gear shifting fork of the reverse gear is controlled to be gradually hung on the odd transmission shaft.

8. A clutch oil charge control device, comprising:

The clutch oil filling first control module is used for controlling the odd clutch corresponding to the reverse gear to fill oil in the dual clutch transmission under the condition that the gear is detected to be switched from the forward gear to the reverse gear, so that the actual pressure of the odd clutch is increased and is always smaller than a preset pressure, wherein the preset pressure is smaller than the half-junction pressure of the odd clutch;

The clutch oil filling second control module is used for controlling the odd clutch to fill oil based on the preset pressure so that the actual pressure of the odd clutch is always smaller than the preset pressure and a first pressure difference value between the actual pressure of the odd clutch and the preset pressure is within a preset first difference value range;

The clutch oil filling third control module is used for controlling the odd clutch to fill oil based on a control pressure which takes the preset pressure as an initial pressure and gradually rises to a target pressure according to a preset rising curve, so that the slope of a change curve of torque transmitted by the odd clutch is located in a preset slope range;

and the clutch oil filling fourth control module is used for controlling the odd clutch to fill oil based on the target pressure so as to complete gear switching.

9. An automatic transmission control unit, characterized by comprising:

At least one processor; and

A memory communicatively coupled to the at least one processor; wherein,

The memory stores a computer program executable by the at least one processor to cause the at least one processor to perform the clutch oil fill control method according to any one of claims 1-7.

10. A computer readable storage medium storing computer instructions for causing a processor to implement the clutch fill control method according to any one of claims 1-7 when executed.