Automatic determination method for oil filling time and sliding friction point pressure of wet clutch

Abstract

This invention discloses an automatic method for determining the oil filling time and slip point pressure of a wet clutch. It addresses the issue of wet clutches operating under no-load conditions when the vehicle is stationary. By setting different speeds, one clutch is kept in a long-engaged state at those speeds, while the other clutch continues to be oil-filled until the speed is reduced. The oil filling time at the end of this process is the FT value. Similarly, while keeping one clutch in a long-engaged state, the pressure of the other clutch slowly increases; when the speed begins to change, this is considered the KP value. This method can quickly and efficiently obtain the key clutch parameters FT and KP values, both during production line operation and in the vehicle environment. This rapidly improves shift quality and enhances overall vehicle comfort. Compared to manual calibration, it significantly saves time and costs. Automatically obtaining more accurate and stable clutch FT and KP values ​​ensures improved vehicle shifting comfort and reliability, better meeting the needs of production line operations and customer on-site operations.

Description

Technical Field

[0001] This invention pertains to vehicle automatic control technology, specifically involving a method for automatically determining the oil filling time and slip point pressure of a wet clutch. Background Technology

[0002] Shifting comfort of wet clutches is one of the key indicators customers use to evaluate transmissions. During mass production, due to variations in the mechanical consistency of clutch components, basic calibration data cannot guarantee good shifting quality for all vehicles. Furthermore, it's impossible to achieve one-vehicle-one-calibration in mass production. Therefore, it's necessary to obtain key clutch parameters—filling time (FT) and slip point pressure (KP)—during the production process or under vehicle conditions. Factory-installed clutches experience shifting shocks due to mechanical variations, and the rapid acquisition of FT and KP values ​​under vehicle conditions is crucial to mitigate these shocks and improve overall vehicle comfort. Therefore, a method is urgently needed to reasonably determine the filling time and slip point pressure of wet clutches under static conditions. Summary of the Invention

[0003] The purpose of this invention is to provide an automatic method for determining the oil filling time and slip point pressure of a wet clutch under static conditions. This method is applicable to both the complete vehicle and the production line. The FT and KP data obtained by this method can further ensure good clutch shifting quality and improve overall vehicle comfort.

[0004] To achieve the above-mentioned technical objectives, the present invention employs the following technical solution:

[0005] An automatic method for determining the oil filling time and slip point pressure of a wet clutch, the method comprising the following steps:

[0006] S1. Determine the initial state requirements of the transmission for engine TSC1 speed control;

[0007] S2. The clutch transition from disengagement to engagement is divided into six control stages:

[0008] FILL1 stage: Rapid oil filling stage, the clutch cavity is rapidly filled;

[0009] FILL2 stage: Slow oil filling stage, ensuring the clutch chamber is fully filled with oil;

[0010] KP stage: The clutch slip point pressure stage, which stabilizes the clutch pressure point and prepares for subsequent control.

[0011] TP stage: Torque transmission stage, ensuring the stability of clutch torque transmission;

[0012] SPON stage: Speed ​​regulation stage, which synchronizes the speeds of the clutch input and output ends;

[0013] LU stage: During the clamping stage, the pressure rises rapidly, causing the clutch control pressure to reach its maximum value;

[0014] S3: Determine the FT and KP values ​​corresponding to the clutch by detecting changes in input shaft speed.

[0015] Furthermore, the FT step is determined in step S3 as follows:

[0016] 1) Select the two clutches corresponding to a certain gear as the control objects, keep one clutch engaged, and use the other clutch as the clutch to be tested;

[0017] 2) Based on the engine speed range, set N speed points for each of the M clutches when FT is determined;

[0018] 3) Sequentially fix the height P1 of the clutch to be tested in stage FILL1. f and time T1 f FILL2 stage height P2 f Set the initial time to the threshold T f Threshold T f The timeout period for detecting speed change during FILL2 stage;

[0019] 4) When the clutch under test is at T f When the input shaft speed decreases within a certain time period, the FT value corresponding to the measured clutch is obtained.

[0020] 5) Repeat steps 3)-4) until all N speed points of M clutches have been traversed, and determine the corresponding FT value in turn.

[0021] Furthermore, the step of determining the KP value in step S3 is as follows:

[0022] a) Select the two clutches corresponding to a certain gear as the control objects, keep one clutch engaged, and use the other clutch as the clutch to be tested;

[0023] b) Based on the engine speed range, set N speed points for each of the M clutches when KP is determined;

[0024] c) Sequentially fix the height P1 of the clutch to be tested in stage FILL1. f Time T1 f The height P2 of the clutch to be tested in stage FILL2 f and time T2 f Set the initial value of the KP pressure of the clutch to be tested. s Pressure step size (step), step size holding time (Δt) s and timeout T k ;

[0025] d) When the clutch under test is at T k When the input shaft speed decreases within a certain time period, the KP value corresponding to the tested clutch is obtained.

[0026] e) Repeat steps c)-e) until the corresponding KP value is determined for the N speed points of the M clutches.

[0027] Specifically, step 4) refers to the clutch under test being at T. f When the input shaft speed decreases within a certain time period, the FT corresponding to the measured clutch is obtained. The specific process is as follows:

[0028] Record the input shaft speed and filling time of the tested clutch at the initial stage of filling in FILL1. When the input shaft speed after entering FILL2 and starting to change gears is greater than the input shaft speed at the start of filling, the difference between the input shaft speed and the input shaft speed is greater than the threshold ΔN. f When the clutch chamber is fully filled with oil, record the time at this moment, and subtract the filling time of FILL1 from this time to obtain the FT corresponding to FILL2; or

[0029] When the input shaft speed of the clutch under test enters the FILL2 stage, the deceleration changes. When the deceleration is less than the deceleration at the previous moment and the deceleration is less than the threshold Δa, and after N consecutive cycles, the FT value corresponding to the clutch under test is obtained at this moment.

[0030] Regarding step d), when the clutch under test is at T... k When the input shaft speed decreases within a certain time period, the KP value corresponding to the tested clutch is obtained. The specific process is as follows:

[0031] Record the input shaft speed of the tested clutch at the initial stage of filling with oil at FILL1. When the KP value increases with the pressure step, the difference between the input shaft speed at this moment and the input shaft speed recorded at the initial stage of filling with oil is greater than the threshold ΔN. k When, that is, the KP value corresponding to the clutch being tested; or

[0032] As the KP value of the clutch under test increases, the input shaft speed decreases. When the deceleration is less than the deceleration at the previous moment and less than the threshold Δa, and this cycle is repeated N times, the KP value at that moment is the KP value corresponding to the clutch under test.

[0033] According to another aspect of this application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, the device where the computer-readable storage medium is located executes the automatic determination method of the overall wet clutch oil filling time and slip point pressure of this application.

[0034] According to another aspect of this application, a processor is provided for running a program, wherein the program executes the automatic determination method of the overall wet clutch oil filling time and slip point pressure of this application.

[0035] Compared with the prior art, this application has the following technical advantages:

[0036] Wet clutches suffer from significant variations in shift quality due to inconsistencies in component mechanics. Furthermore, the lack of standardized, one-to-one data sets makes individual calibration impossible. This new method addresses the issue of wet clutches operating under no-load conditions with a stationary vehicle. By setting different engine speeds, one clutch is kept in a prolonged engagement state while the other continuously pumps oil until the speed drops. The duration of this oil pumping is the FT value. Conversely, maintaining one clutch in a prolonged engagement state while the pressure of the other clutch slowly increases, the point at which the speed begins to change, is considered the KP value. This method provides rapid and efficient acquisition of key clutch parameters (FT and KP values) both during production line operations and in the vehicle environment. It quickly improves shift quality and enhances overall vehicle comfort, significantly saving time and costs compared to manual calibration. Automated acquisition of more accurate and stable clutch FT and KP values ​​ensures improved shift comfort and reliability, better meeting the needs of production line operations and customer on-site operations. Attached Figure Description

[0037] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0038] Figure 1 This is the initial state of the transmission controlling the engine TSC1 speed according to the present invention;

[0039] Figure 2 This is a schematic diagram of the clutch control stage from open to engaged state according to the present invention;

[0040] Figure 3a This is a schematic diagram of the speed difference speed change detection method of the present invention; Figure 3b This is a schematic diagram of the deceleration speed change detection method of the present invention;

[0041] Figure 4 This is a timing diagram for the automatic clutch determination of the present invention;

[0042] Figure 5 This is a diagram showing the overall results of FT and KP timing tests in an embodiment of the present invention.

[0043] Figure 6a This is a partial enlarged view of the timing test results of the FT embodiment of the present invention; Figure 6bThis is a partially enlarged view of the timing test results of embodiment KP of the present invention.

[0044] Figure 7 This is a schematic diagram of the structure of a computer device in an embodiment of the present invention. Detailed Implementation

[0045] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0046] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0047] See Figure 1 The present invention discloses an automatic method for determining the oil filling time and slip point pressure of a wet clutch, the method comprising the following steps:

[0048] Step S1: Determine the initial state requirements of the transmission for engine TSC1 speed control.

[0049] During normal driving, the upshift and downshift points are approximately between the engine idle speed and the rated speed. Therefore, the automatic determination method of this invention must cover the speed points within this range, that is, take different speed points (N1, N2, N3, N4...) between the idle speed and the rated speed, and the values ​​are based on the engine speed range.

[0050] During the automatic speed determination process, the engine speed needs to be controlled at different speed points. Therefore, the engine must be able to respond to the TSC1 speed control command. When the transmission sends the TSC1 speed control command, the AEPT (SPN 513) should respond within 75ms, and the engine speed should change within 250ms. Figure 1 As shown, the time it takes for the engine speed to reach the control speed is Δt. When the speed difference between the control speed and the actual speed is within 100 rpm, it needs to reach a stable speed within 1.5 seconds; when the speed difference is between 100 and 200 rpm, it needs to reach a stable speed within 2.5 seconds; and when the speed difference is greater than 200 rpm, it needs to reach a stable speed within 3 seconds. The stable speed should be within + / - 10 rpm of the target speed without oscillation. Here, Δt represents the time difference between the engine speed being pulled down from the lowest point when the clutch engages and returning to its initial state.

[0051] Step S2 divides the clutch from the open to the engaged state into six control stages, as follows: (See below) Figure 2 :

[0052] FILL1 stage: Rapid oil filling stage, the clutch cavity is rapidly filled;

[0053] FILL2 stage: Slow oil filling stage, ensuring the clutch chamber is fully filled with oil;

[0054] KP stage: The clutch slip point pressure stage, which stabilizes the clutch pressure point and prepares for subsequent control.

[0055] TP stage: Torque transmission stage, ensuring the stability of clutch torque transmission;

[0056] SPON stage: Speed ​​regulation stage, which synchronizes the speeds of the clutch input and output ends;

[0057] LU stage: During the clamping stage, the pressure rises rapidly, causing the clutch control pressure to reach its maximum value.

[0058] Step S3: Determine the FT value and KP value corresponding to the clutch by detecting the change in input shaft speed.

[0059] The specific approach involves selecting two clutches corresponding to a given gear as the control objects. Each gear is controlled by two clutches, Clutch1 (C1) and Clutch2 (C2). During automatic determination and wet clutch control, one clutch is kept engaged, while the other is used as the clutch under test. With one clutch engaged, as the clutch under test disengages, the gear shift is achieved by gradually increasing the pressure of the engaged clutch. The oil filling FT value is continuously monitored by observing the change in input shaft speed when the clutch under test is engaged, and the KP value is detected by observing the change in input shaft speed caused by the stepwise increase in pressure.

[0060] In step S3, the FT step is determined as follows:

[0061] 1) Select the two clutches corresponding to a certain gear as the control objects, keep one clutch engaged, and use the other clutch as the clutch to be tested;

[0062] 2) Based on the engine speed range, set N speed points for each of the M clutches when FT is determined;

[0063] 3) Sequentially fix the height P1 of the clutch to be tested in stage FILL1. f and time T1 f FILL2 stage height P2 f Set the initial time to the threshold T f Threshold Tf The timeout period for detecting speed change during FILL2 stage;

[0064] 4) When the clutch under test is at T f When the input shaft speed decreases within a certain time period, the FT value corresponding to the measured clutch is obtained.

[0065] 5) Repeat steps 3)-4) until all N speed points of M clutches have been traversed, and determine the corresponding FT value in turn.

[0066] The steps for determining the KP time in step S3 are as follows:

[0067] a) Select the two clutches corresponding to a certain gear as the control objects, keep one clutch engaged, and use the other clutch as the clutch to be tested;

[0068] b) Based on the engine speed range, set N speed points for each of the M clutches when KP is determined;

[0069] c) Sequentially fix the height P1 of the clutch to be tested in stage FILL1. f Time T1 f The height P2 of the clutch to be tested in stage FILL2 f and time T2 f Set the initial value of the KP pressure of the clutch to be tested. s Pressure step size (step), step size holding time (Δt) s and timeout T k ;

[0070] d) When the clutch under test is at T k When the input shaft speed decreases within a certain time period, the KP value corresponding to the tested clutch is obtained.

[0071] e) Repeat steps c)-e) until the corresponding KP value is determined for the N speed points of the M clutches.

[0072] This invention continuously detects the oil filling FT value by measuring the change in input shaft speed when the clutch under test is engaged, and detects the KP value by measuring the change in input shaft speed caused by the step increase in pressure.

[0073] Referring to Figure 3, two methods are used for speed change detection: the first is the speed difference judgment method, when the clutch under test is at T f When the input shaft speed decreases within a certain time period, the process for determining the FT value corresponding to the measured clutch is as follows:

[0074] Record the input shaft speed and filling time of the tested clutch at the initial stage of filling in FILL1. When the input shaft speed after entering FILL2 and starting to change gears is greater than the input shaft speed at the start of filling, the difference between the input shaft speed and the input shaft speed is greater than the threshold ΔN. f When the clutch chamber is full of oil, record the time at this moment, and subtract the filling time of FILL1 from this time to get the FT value corresponding to FILL2.

[0075] When the clutch under test is at T k When the input shaft speed decreases within a certain time period, the KP value corresponding to the tested clutch is obtained. The specific process is as follows:

[0076] Record the input shaft speed of the tested clutch at the initial stage of filling with oil at FILL1. When the KP value increases with the pressure step, the difference between the input shaft speed at this moment and the input shaft speed recorded at the initial stage of filling with oil is greater than the threshold ΔN. k When the time is specified, it corresponds to the KP value of the clutch being tested.

[0077] The second method is the deceleration judgment method, when the clutch under test is at T f When the input shaft speed decreases within a certain time period, the FT value of the tested clutch is determined as follows: When the tested clutch enters the FILL2 stage, the input shaft speed decelerates. When the deceleration is less than the deceleration at the previous moment and less than the threshold Δa, and after N consecutive iterations, this moment is the FT value of the tested clutch.

[0078] When the clutch under test is at T k When the input shaft speed decreases within a certain time period, the KP value corresponding to the tested clutch is obtained. The specific process is as follows: When the tested clutch enters the FILL2 stage, the input shaft speed decelerates. When the deceleration is less than the deceleration at the previous moment and the deceleration is less than the threshold Δa, and after N consecutive cycles, the KP value at that moment is the KP value corresponding to the tested clutch.

[0079] In practical applications, for automatic confirmation of FT value, the deceleration judgment method is usually more suitable, as it has higher stability and accuracy; for automatic confirmation of KP, the speed difference method is more suitable, as it is suitable for large-scale use.

[0080] See Figure 4 This is the timing diagram for automatically determining the clutch mechanism according to the present invention.

[0081] After engine ignition, two clutches corresponding to a specific gear are selected as the control objects, with one clutch engaged and the other designated as the clutch to be tested. Based on the engine speed range, N speed points are sequentially set for each of the M clutches, and the corresponding FT and KP values ​​are determined one by one. Based on accuracy and reliability targets, the detection frequency and waiting Δt for determining the FT or KP values ​​are adjusted. l The timing rules for automatic clutch determination are obtained.

[0082] Example

[0083] The vehicle is equipped with a gas engine and a 6-speed automatic transmission. The automatic determination process for the clutch filling time and slip point pressure is as follows:

[0084] 1. Park the vehicle on a level surface, engage the handbrake, depress the foot brake, allow the automatic transmission fluid to reach normal operating temperature, and start the engine to idle. Select the two clutches corresponding to a specific gear as the control objects, keeping one clutch engaged, and the other clutch as the clutch to be tested.

[0085] 2. Based on the engine speed range, set N speed points (i.e., N1, N2, N3...) for each of the M clutches when FT is determined.

[0086] 3. Set the idle waiting time Δt l。

[0087] 4. Set the parameters for determining the FT value

[0088]

[0089] 5. Set KP value to determine parameters

[0090]

[0091] 6. Once the parameters are set, the simulated gear will first maintain one clutch engaged, and then the automatic gear selection command will be activated.

[0092] 7. After the automatic determination command is issued, the engine speed is controlled at the N1 speed point.

[0093] 8. The clutch under test undergoes FILL1 stage oil filling, followed by FILL2 stage oil filling. The FILL2 stage oil filling is performed at T... f The input shaft deceleration is detected in real time over a period of time. When the set value Δa is reached and N cycles are repeated, the clutch is immediately released and the time is recorded.

[0094] 9. Waiting for Δt l After the time is up, repeat step 8. At this point, the two clutch filling time learning values ​​are recorded, and the average value is taken as the final clutch filling time FT.

[0095] 10. After completing two FT training sessions, wait for Δt. l During the time interval, the clutch performs second-stage oil filling (FILL1 and FILL2), then enters KP, and KP starts from the initial set value. s The pressure step size (step) and step duration (Δt) begin to increase continuously. s During the KP accumulation process, the input shaft speed difference change is detected in real time. When the speed difference change is greater than ΔN k When the clutch pressure is released immediately, the pressure at that moment can be considered as the KP value.

[0096] 11. Waiting for Δt l After a certain time, repeat the process 10 times. At this point, the clutch KP value is recorded twice, and the average value is taken as the final KP value.

[0097] 12. Repeat steps 1-11 above for each of the M clutches until N speed points of the M clutches are obtained, and then determine the corresponding FT value and KP value.

[0098] See Figure 5 The images show actual test results under full vehicle conditions. Figure 6a This is a partial enlarged view of the timing test results of the FT embodiment of the present invention; Figure 6b This is a partially enlarged view of the timing test results of KP in an embodiment of the present invention. The FT value and KP obtained by this method are more accurate and reliable than those obtained by traditional testing methods.

[0099] Based on the same technical concept, this application also provides a computer device, such as... Figure 7 As shown, the computer device includes a transceiver, a processor, and a memory. The memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, the processor performs the automatic determination method for wet clutch oil filling time and slip point pressure described in the above embodiments.

[0100] Based on the same technical concept, this application also provides a storage medium storing computer-readable instructions, which, when executed by one or more processors, cause the one or more processors to execute the automatic determination method for wet clutch oil filling time and slip point pressure described in the above embodiments.

[0101] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium such as (ROM / RAM) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

Claims

1. A method for automatically determining the oil filling time and slip point pressure of a wet clutch, characterized in that: The method includes the following steps: S1. Determine the initial state requirements of the transmission for engine TSC1 speed control; S2. The clutch transition from disengagement to engagement is divided into six control stages: FILL1 stage: Rapid oil filling stage, the clutch cavity is rapidly filled; FILL2 stage: Slow oil filling stage, ensuring the clutch chamber is fully filled with oil; KP stage: The clutch slip point pressure stage, which stabilizes the clutch pressure point and prepares for subsequent control. TP stage: Torque transmission stage, ensuring the stability of clutch torque transmission; SPON stage: Speed ​​regulation stage, which synchronizes the speeds of the clutch input and output ends; LU stage: During the clamping stage, the pressure rises rapidly, causing the clutch control pressure to reach its maximum value; S3: Determine the FT and KP values ​​corresponding to the clutch by detecting changes in input shaft speed.

2. The automatic determination method for oil filling time and slip point pressure of a wet clutch as described in claim 1, characterized in that: The FT step is determined in step S3 as follows: 1) Select the two clutches corresponding to a certain gear as the control objects, keep one clutch engaged, and use the other clutch as the clutch to be tested; 2) Based on the engine speed range, set N speed points for each of the M clutches when FT is determined; 3) Fix the height P1 of the clutch to be tested in the FILL1 stage in turn f and time T1 f , fix the height P2 of the clutch to be tested in the FILL2 stage f , set the initial time as threshold T f , threshold T f is the detection timeout time of the speed change in the FILL2 stage 4) When the clutch under test is in T f time, the input shaft speed decreases, then the FT value corresponding to the tested clutch is obtained; 5) Repeat steps 3)-4) until all N speed points of M clutches have been traversed, and determine the corresponding FT value in turn.

3. The automatic determination method for oil filling time and slip point pressure of a wet clutch as described in claim 1, characterized in that: The step of determining the KP time in step S3 is as follows: a) Select the two clutches corresponding to a certain gear as the control objects, keep one clutch engaged, and use the other clutch as the clutch to be tested; b) Based on the engine speed range, set N speed points for each of the M clutches when KP is determined; c) sequentially fix the height P1 of the FILL1 stage clutch under test f , the time T1 f and the height P2 of the FILL2 stage clutch under test f and the time T2 f ; set the initial value KP of the KP pressure of the clutch under test s , the pressure step step, the step holding time Δt s and the timeout time T k ; d) When the clutch to be tested is in T k time, the input shaft speed decreases, then the KP value corresponding to the tested clutch is obtained; e) Repeat steps c)-e) until the corresponding KP value is determined for the N speed points of the M clutches.

4. The automatic determination method for oil filling time and slip point pressure of a wet clutch as described in claim 2, characterized in that: Step 4) When the clutch under test is at T f When the input shaft speed decreases within a certain time period, the FT value corresponding to the measured clutch is obtained. The specific process is as follows: Record the input shaft speed and filling time of the tested clutch at the initial stage of filling in FILL1. When the input shaft speed after entering FILL2 and starting to change gears exceeds the threshold ΔN, the difference between the input shaft speed at the start of filling and the input shaft speed at the beginning of filling is recorded. f When the clutch chamber is fully filled with oil, record the time at this moment, and subtract the filling time of FILL1 from this time to obtain the FT value corresponding to FILL2; or When the input shaft speed of the clutch under test enters the FILL2 stage, the deceleration changes. When the deceleration is less than the deceleration at the previous moment and the deceleration is less than the threshold Δa, and after N consecutive cycles, the FT value corresponding to the clutch under test is obtained at this moment.

5. The method for automatically determining the oil filling time and slip point pressure of a wet clutch as described in claim 3, characterized in that: Step d) When the clutch under test is at T k When the input shaft speed decreases within a certain time period, the KP value corresponding to the tested clutch is obtained. The specific process is as follows: Record the input shaft speed of the tested clutch at the initial stage of filling with oil at FILL1. When the KP value increases with the pressure step, the difference between the input shaft speed at this moment and the input shaft speed recorded at the initial stage of filling with oil is greater than the threshold ΔN. k When, that is, the KP value corresponding to the clutch being tested; or As the KP value increases, the input shaft speed decreases. When the deceleration is less than the deceleration at the previous moment and less than the threshold Δa, and this cycle is repeated N times, the KP value at that moment is the KP value corresponding to the clutch being tested.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the automatic determination method for the oil filling time and slip point pressure of the wet clutch as described in any one of claims 1 to 5.

7. A processor, characterized in that, The processor is used to run a program, wherein the program executes the automatic determination method for the oil filling time and slip point pressure of the wet clutch as described in any one of claims 1 to 5.

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