Wet clutch oil charge time calibration method and device

Abstract

The invention discloses a wet clutch oil charge time calibration method and device. The wet clutch oil charge time calibration method comprises the steps that when whole vehicle state information of a vehicle meets a preset condition, if calibration triggering information is received, a target calibration category is determined according to the triggering information; calibrating the oil charging time of each wet clutch of the vehicle according to the target calibration category so as to determine the initial oil charging time of each wet clutch in the vehicle; when the vehicle runs, according to at least one of the actual oil temperature of the gearbox and the actual running parameters of the vehicle, the initial oil charging time is corrected, and the final oil charging time is obtained; wherein the actual operation parameters at least comprise the actual rotating speed and the actual torque of an engine of the vehicle. According to the technical scheme, the accuracy of controlling the oil charging state of the wet clutch is improved.

Description

Technical Field

[0001] This invention relates to the field of clutches, and more particularly to a method and apparatus for calibrating the oil filling time of a wet clutch. Background Technology

[0002] With the development of vehicle technology, there are more and more types of vehicles.

[0003] Tractors are important agricultural machinery with a wide range of load variations during operation and a large number of gears in their transmissions. Due to their advantages such as good heat dissipation and long service life, wet clutches are increasingly being used on tractors.

[0004] The quality of clutch control plays a decisive role in the quality of gear shifting, and the control of the rapid oil filling time of the clutch cylinder is a particularly important aspect. Rapid oil filling of the clutch cylinder is primarily to quickly eliminate the free travel of the clutch piston.

[0005] However, due to manufacturing errors, the capacity of different wet clutch cylinders varies. Therefore, it is difficult to accurately judge the oil filling status of the wet clutch cylinder. Insufficient oil filling often occurs, which leads to a delay in the wet clutch engagement process, or oil overflow causes the wet clutch to suddenly transmit torque, resulting in wet clutch engagement shock or vibration during engagement. In other words, during tractor gear shifting, the wet clutch has the problem of not being able to accurately control the oil filling status. Summary of the Invention

[0006] This invention provides a method and apparatus for calibrating the oil filling time of a wet clutch, which solves the problem of inaccurate control of the oil filling state of a wet clutch.

[0007] According to one aspect of the present invention, a method for calibrating the oil filling time of a wet clutch is provided, the wet clutch being applied to a vehicle, the vehicle including a transmission, the transmission being provided with at least one of the wet clutches; the method includes:

[0008] When the vehicle's overall status information meets preset conditions, if calibration trigger information is received, the target calibration category is determined based on the trigger information.

[0009] The filling time of each wet clutch in the vehicle is calibrated according to the target calibration category to determine the initial filling time of each wet clutch in the vehicle.

[0010] When the vehicle is running, the initial filling time is corrected based on at least one of the actual oil temperature of the transmission and the actual operating parameters of the vehicle to obtain the final filling time; wherein the actual operating parameters include at least the actual speed and actual torque of the vehicle's engine.

[0011] Optionally, when the vehicle's overall status information meets preset conditions, if calibration trigger information is received, the target calibration category is determined based on the trigger information, including:

[0012] When the vehicle is in parking brake mode, the vehicle is in neutral gear, and the transmission oil temperature is within a preset temperature range, if calibration trigger information is received, the target calibration category is determined based on the trigger information.

[0013] Optionally, the calibration trigger information includes instrument calibration information and / or combined trigger information;

[0014] Determining the target labeling category based on the triggering information includes:

[0015] The target calibration category is determined based on the instrument calibration information; wherein, the target calibration category includes first speed calibration, first speed continued calibration, second speed calibration, second speed continued calibration, and continuous calibration;

[0016] And / or, the target calibration category is determined based on the vehicle's brake pedal trigger information and / or accelerator pedal trigger information, and the number of times the trigger button is triggered.

[0017] Optionally, the target calibration category is determined based on the vehicle's brake pedal trigger information and / or accelerator pedal trigger information, and the number of times the trigger button is triggered, including:

[0018] If the combined trigger information includes brake pedal trigger information, and the number of times the trigger button is triggered is greater than a first preset number and less than a second preset number, then the target calibration category is determined to be the first speed calibration.

[0019] If the combined trigger information includes brake pedal trigger information, and the number of times the trigger button is triggered is greater than or equal to the second preset number, then the target calibration category is determined to be the first speed calibration.

[0020] If the combined trigger information includes accelerator pedal trigger information, and the number of times the trigger button is triggered is greater than a first preset number and less than a second preset number, then the target calibration category is determined to be the second speed calibration.

[0021] If the combined trigger information includes accelerator pedal trigger information, and the number of times the trigger button is triggered is greater than or equal to the second preset number, then the target calibration category is determined to be the second rotational speed for continued calibration.

[0022] If the combined trigger information includes the brake pedal trigger information and the accelerator pedal trigger information, and the number of times the trigger button is triggered is greater than a first preset number, then the target calibration category is determined to be continuous calibration.

[0023] Optionally, the filling time of each wet clutch in the vehicle is calibrated according to the target calibration category to determine the initial filling time of each wet clutch in the vehicle, including:

[0024] When the target calibration category is either the first speed calibration or the second speed calibration, the calibration strategy is executed on each of the wet clutches in a preset order;

[0025] When the target calibration category is either the first speed calibration or the second speed calibration, the calibration strategy is executed one by one for each uncalibrated wet clutch.

[0026] The calibration strategy includes:

[0027] The solenoid valve is opened according to the preset oil filling current of the solenoid valve corresponding to the wet clutch, and the wet clutch is filled with oil according to the preset oil filling time.

[0028] If at least one first change in the actual engine speed during the oil filling process is less than a first set value, and at least one second change in the actual engine torque during the oil filling process is less than a second set value, then the current preset oil filling time is added to the first adjustment value to obtain the next preset oil filling time. After the wet clutch disengages, the process returns to the step of controlling the solenoid valve to open according to the preset oil filling current of the solenoid valve corresponding to the wet clutch, and oiling the wet clutch according to the preset oil filling time, until each first change in the actual engine speed during the oil filling process is greater than or equal to the first set value, and each second change in the actual engine torque during the oil filling process is greater than or equal to the second set value; wherein, the first set value corresponding to the first speed calibration is different from the first set value corresponding to the second speed calibration, and the second set value corresponding to the first speed calibration is different from the second set value corresponding to the second speed calibration.

[0029] Subtract the second adjustment value from the current preset oil filling time to obtain the next preset oil filling time. After the wet clutch disengages, return to the step of controlling the solenoid valve to open according to the preset oil filling current of the solenoid valve corresponding to the wet clutch, and oil filling the wet clutch according to the preset oil filling time, until there is a first change in the actual speed of the engine that is less than the first set value, and a second change in the actual torque of the engine that is less than the second set value, and the current preset oil filling time is taken as the initial oil filling time; wherein, the second adjustment value is less than any of the first adjustment values.

[0030] Optionally, when the target calibration category is the second speed calibration or the second continued speed calibration, before controlling the solenoid valve to open according to the preset oil filling current of the solenoid valve corresponding to the wet clutch, the method further includes:

[0031] The engine speed is controlled to a preset speed.

[0032] Optionally, calibrating the filling time of each wet clutch in the vehicle according to the target calibration category to determine the initial filling time of each wet clutch in the vehicle further includes:

[0033] When the target calibration category is continuous calibration, the calibration strategy is executed on each wet clutch in a preset order according to the preset oil filling time, first set value and second set value corresponding to the first speed calibration during the first oil filling. Then, the calibration strategy is executed on each wet clutch in a preset order according to the preset oil filling time, first set value and second set value corresponding to the second speed calibration during the first oil filling.

[0034] Optionally, if the current preset oil filling time is greater than a preset time threshold, the wet clutch calibration is determined to have failed.

[0035] Optionally, the initial filling time is corrected based on at least one of the actual oil temperature of the transmission and the actual operating parameters of the vehicle to obtain the final filling time, including:

[0036] When the actual oil temperature of the transmission is lower than the calibrated oil temperature at which the initial filling time was determined, the initial filling time is added to a first correction value to obtain the final filling time; wherein, the lower the actual oil temperature, the larger the first correction value;

[0037] When the actual oil temperature of the transmission is greater than the calibrated oil temperature, the initial filling time is subtracted from the second correction value to obtain the final filling time; wherein, the higher the actual oil temperature, the larger the second correction value.

[0038] Optionally, the initial filling time is corrected based on at least one of the actual oil temperature of the transmission and the actual operating parameters of the vehicle to obtain the final filling time, including:

[0039] When the actual oil temperature of the transmission is greater than the calibrated oil temperature at which the initial filling time was determined, the initial filling time is subtracted from the second correction value to obtain the first intermediate filling time.

[0040] If, during the actual oil filling process, each first change in the actual engine speed is greater than the first change threshold, and each second change in the actual engine torque is greater than the second change threshold, then the first intermediate oil filling time is subtracted from the third correction value to obtain the final oil filling time.

[0041] When the actual oil temperature of the transmission is lower than the calibrated oil temperature, the initial filling time is added to the first correction value to obtain the second intermediate filling time;

[0042] If, during the actual oil filling process, each first change in the actual engine speed is less than the first change threshold, and each second change in the actual engine torque is less than the second change threshold, the second intermediate oil filling time is added to the fourth correction value to obtain the final oil filling time.

[0043] According to another aspect of the present invention, a wet clutch filling time calibration device is provided, the wet clutch being applied to a vehicle, the vehicle including a transmission, the transmission having at least one of the wet clutches disposed therein; the device includes:

[0044] The calibration category determination module is used to determine the target calibration category based on the calibration trigger information if the vehicle's overall status information meets preset conditions.

[0045] A calibration module is used to calibrate the oil filling time of each wet clutch in the vehicle according to the target calibration category, so as to determine the initial oil filling time of each wet clutch in the vehicle.

[0046] A correction module is used to correct the initial filling time based on at least one of the actual oil temperature of the transmission and the actual operating parameters of the vehicle while the vehicle is running, to obtain a final filling time; wherein the actual operating parameters include at least the actual speed and actual torque of the vehicle's engine.

[0047] The technical solution of this invention, when the vehicle's overall status information meets preset conditions, if calibration trigger information is received, then a target calibration category is determined based on the trigger information. The oil filling time of each wet clutch in the vehicle is calibrated according to the target calibration category to determine the initial oil filling time of each wet clutch. By calibrating the oil filling time of each wet clutch according to the target calibration category, a more suitable calibration strategy or calibration strategy parameters can be determined, facilitating accurate determination of the initial oil filling time of the wet clutch, thereby enabling more precise control of the wet clutch's oil filling state. During vehicle operation, the initial oil filling time is corrected based on at least one of the actual transmission oil temperature and the vehicle's actual operating parameters to obtain the final oil filling time. This ensures that the final oil filling time matches the actual transmission oil temperature and the vehicle's operation, avoiding problems such as insufficient oil filling or oil overflow in the wet clutch, thus enabling more precise control of the wet clutch's oil filling state.

[0048] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a flowchart of a wet clutch oil filling time calibration method provided in an embodiment of the present invention;

[0051] Figure 2 This is a flowchart of another wet clutch oil filling time calibration method provided in an embodiment of the present invention;

[0052] Figure 3 This is a flowchart of another wet clutch oil filling time calibration method provided in the embodiments of the present invention;

[0053] Figure 4 This is a flowchart of another wet clutch oil filling time calibration method provided in the embodiments of the present invention;

[0054] Figure 5 This is a schematic diagram of a wet clutch oil filling time calibration device provided in an embodiment of the present invention. Detailed Implementation

[0055] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0056] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0057] This invention provides a method for calibrating the oil filling time of a wet clutch. The wet clutch is applied to vehicles, including tractors, cars, and other vehicles, without limitation. The vehicle includes a transmission, and the transmission is equipped with at least one wet clutch. The wet clutch uses a hydraulic system to control pressure, causing friction plates immersed in oil to engage or disengage. When the friction plates are engaged, power transmission occurs, transferring engine power to the corresponding input shaft. When the friction plates disengage, power transmission is cut off. The transmission may have one wet clutch or at least two wet clutches, with different gears corresponding to different wet clutches. For example, first gear may correspond to one wet clutch, and second gear to another. Alternatively, odd-numbered gears may correspond to one wet clutch, and even-numbered gears to another wet clutch, without limitation. During gear shifting, the wet clutch corresponding to the gear is first filled with oil, allowing it to engage and transmit power, thus achieving gear switching. The wet clutch filling time calibration method can be performed by a wet clutch filling time calibration device, such as a vehicle controller that includes a wet clutch filling time calibration device. The vehicle controller can be a vehicle controller or a controller that controls the engine; there is no limitation on this.

[0058] Figure 1 This is a flowchart of a wet clutch oil filling time calibration method provided in an embodiment of the present invention, referred to as [reference]. Figure 1 The calibration method for the oil filling time of a wet clutch includes:

[0059] S110. When the vehicle's overall status information meets the preset conditions, if calibration trigger information is received, the target calibration category is determined based on the trigger information.

[0060] The vehicle status information may include whether the vehicle is parked, whether the accelerator pedal is depressed, whether the brake pedal is depressed, the transmission oil temperature, and the actual gear the vehicle is in.

[0061] Specifically, when the vehicle's overall status information meets preset conditions, such as when the vehicle is parked and not in operation, indicating that the vehicle meets the conditions for calibrating the oil filling time of the wet clutch, upon receiving calibration trigger information, the target calibration category can be determined based on the trigger information, and then calibration can be performed according to the calibration strategy corresponding to the target calibration category. The calibration trigger information can be from a button or key on the vehicle, from the vehicle's instrument panel, from the vehicle's touchscreen, or a combination of trigger information from the accelerator pedal and / or brake pedal and buttons; no specific limitations are imposed here.

[0062] S120. The filling time of each wet clutch in the vehicle is calibrated according to the target calibration category to determine the initial filling time of each wet clutch in the vehicle.

[0063] Specifically, for example, when the vehicle is parked, the oil filling time of each wet clutch in the vehicle is calibrated to determine the initial oil filling time of each wet clutch in the vehicle.

[0064] The calibration strategies corresponding to different calibration categories can be the same or different. In some embodiments, the calibration strategies corresponding to different calibration categories are different. In this case, the oil filling time of each wet clutch of the vehicle is calibrated according to the calibration strategy corresponding to the target calibration category. In some embodiments, the calibration strategies corresponding to different calibration categories are the same, but some parameters in the calibration strategies corresponding to different calibration categories may be different. In this case, the oil filling time of each wet clutch of the vehicle is calibrated according to the calibration strategy and the parameters of the calibration strategy corresponding to the target calibration category. The parameters of the calibration strategy may include the change threshold of the vehicle's operating parameters, etc., and are not limited here.

[0065] By calibrating the filling time of each wet clutch in the vehicle according to the target calibration category, a more suitable calibration strategy or calibration strategy parameters can be determined based on the target calibration category. This facilitates accurate determination of the initial filling time of the wet clutch, thereby enabling more precise control of the filling state of the wet clutch.

[0066] S130. When the vehicle is running, the initial filling time is corrected based on at least one of the actual oil temperature of the transmission and the actual operating parameters of the vehicle to obtain the final filling time; wherein, the actual operating parameters include at least the actual speed and actual torque of the vehicle's engine.

[0067] Specifically, during actual vehicle operation, the actual transmission oil temperature and the vehicle's actual operating parameters are obtained. In some implementations, the initial filling time can be corrected based on the actual transmission oil temperature. For example, if the actual transmission oil temperature differs significantly from the calibrated oil temperature during filling time calibration, the correction value corresponding to the actual oil temperature can be used to adjust the initial filling time. This allows the initial filling time to be adjusted based on the actual temperature, ensuring the final filling time matches the actual oil temperature. This avoids issues like excessively fast filling rates at high temperatures, which could lead to overflow in the wet clutch, and insufficient filling rates at low temperatures. This allows for more precise control of the wet clutch's filling state. In some implementations, the initial filling time can be corrected based on the vehicle's actual operating parameters. For example, if the engine speed and torque vary significantly, the correction value can be subtracted from the initial filling time to prevent excessively long filling times that could cause overflow in the wet clutch. When the actual engine speed and torque changes are too small, a correction value can be added to the initial filling time to prevent insufficient filling of the wet clutch due to an inadequate filling time. This allows for more precise control of the wet clutch's filling status, resulting in better vehicle operation control. In some implementations, the initial filling time can be corrected based on the actual transmission oil temperature and the vehicle's actual operating parameters, ensuring that the final filling time matches the transmission oil temperature and vehicle operation. This prevents insufficient or excessive filling of the wet clutch, further enabling more precise control of its filling status.

[0068] In this embodiment, when the vehicle's overall status information meets preset conditions, if calibration trigger information is received, a target calibration category is determined based on the trigger information. The oil filling time of each wet clutch in the vehicle is then calibrated according to the target calibration category to determine the initial oil filling time of each wet clutch. By calibrating the oil filling time of each wet clutch according to the target calibration category, a more suitable calibration strategy or calibration strategy parameters can be determined, facilitating accurate determination of the initial oil filling time of the wet clutch and thus enabling more precise control of the wet clutch's oil filling state. During vehicle operation, the initial oil filling time is corrected based on at least one of the actual transmission oil temperature and the vehicle's actual operating parameters to obtain the final oil filling time. This ensures that the final oil filling time matches the actual transmission oil temperature and the vehicle's operation, avoiding insufficient or excessive oil filling in the wet clutch, thereby enabling more precise control of the wet clutch's oil filling state.

[0069] Based on the above technical solutions, Figure 2 This is a flowchart of another wet clutch oil filling time calibration method provided by an embodiment of the present invention. Optionally, refer to... Figure 2 The calibration method for the oil filling time of a wet clutch includes:

[0070] S210. When the vehicle is in parking brake mode, the vehicle is in neutral gear, and the transmission oil temperature is within the preset temperature range, if calibration trigger information is received, the target calibration category is determined based on the trigger information.

[0071] Specifically, when the vehicle is in parking brake mode and in neutral, it indicates that the vehicle will not move due to clutch lubrication, thus avoiding inaccurate calibration. When the transmission oil temperature is within the preset temperature range, it indicates that the transmission oil temperature is normal and close to the normal operating temperature, ensuring the accuracy of the lubrication time calibration. When the vehicle is in parking brake mode, in neutral, and the transmission oil temperature is within the preset temperature range, it indicates that the vehicle's overall status information meets the preset conditions. If a calibration trigger message is received at this time, the target calibration category is determined based on the trigger message.

[0072] S220. The filling time of each wet clutch in the vehicle is calibrated according to the target calibration category to determine the initial filling time of each wet clutch in the vehicle.

[0073] S230. When the vehicle is running, the initial filling time is corrected based on at least one of the actual oil temperature of the transmission and the actual operating parameters of the vehicle to obtain the final filling time; wherein, the actual operating parameters include at least the actual speed and actual torque of the vehicle's engine.

[0074] Based on the above technical solutions, optionally, the calibration trigger information includes instrument calibration information and / or combined trigger information. That is, the wet clutch filling time calibration device can receive instrument calibration information from the instrument, and can also receive combined trigger information from at least two devices.

[0075] Optionally, the target calibration category is determined based on the trigger information, including:

[0076] The target calibration category is determined based on the instrument calibration information; among which, the target calibration category includes first speed calibration, first speed continued calibration, second speed calibration, second speed continued calibration, and continuous calibration;

[0077] And / or, based on the vehicle's brake pedal trigger information and / or accelerator pedal trigger information, and the number of times the trigger button is triggered, determine the target calibration category.

[0078] The first speed calibration can be a low-speed calibration, meaning the filling time of the wet clutch is calibrated when the vehicle's engine speed is low, such as when the brake pedal is depressed. The first speed calibration can be continued after the low-speed calibration, calibrating any wet clutches that were not calibrated. In other words, if the previous first speed calibration was interrupted and there are wet clutches that were not calibrated, then the calibration will continue for those uncalibrated clutches. The second speed calibration can be a high-speed calibration, meaning the filling time of the wet clutch is calibrated when the vehicle's engine speed is high, such as when the accelerator pedal is depressed. The second speed calibration can also be continued after the high-speed calibration, calibrating any wet clutches that were not calibrated. In other words, if the previous second speed calibration was interrupted and there are wet clutches that were not calibrated, then the calibration will continue for those uncalibrated clutches. The brake pedal, or brake pedal, is used in various applications. When the brake pedal is depressed, the engine decelerates, stops, or runs at a low, constant speed. When the vehicle is running or parked, the engine accelerates or runs at a high, constant speed when the accelerator pedal is depressed. When the vehicle is parked, if the brake pedal is depressed, the engine idles at a low speed. When the vehicle is parked, if the accelerator pedal is depressed, the engine accelerates to the speed corresponding to the pedal's travel, resulting in a higher engine speed.

[0079] Specifically, in some embodiments, the instrument can send communication information to the wet clutch filling time calibration device. The communication information may include instrument calibration information. The target calibration category can be determined based on the specific content of the instrument calibration information. That is, the instrument calibration information may include multiple data bits. A portion of the data bits may represent the target calibration category. For example, 0001 represents the first speed calibration, 0011 represents the first speed continued calibration, etc., which is not limited here.

[0080] The vehicle may have a separate trigger button for triggering the fuel filling time calibration, or the vehicle's existing button may be used as the trigger button; this is not limited to either. In some implementations, the target calibration category can be determined based on the vehicle's brake pedal trigger information and / or accelerator pedal trigger information, as well as the number of times the trigger button is triggered. Brake pedal trigger information includes the brake pedal being depressed, and accelerator pedal trigger information includes the accelerator pedal being depressed.

[0081] In some implementations, the target calibration category can be determined by combining instrument trigger information, brake pedal trigger information and / or accelerator pedal trigger information, and the number of triggers of the trigger button, which can improve the accuracy of target calibration category determination.

[0082] Optionally, the target calibration category is determined based on the vehicle's brake pedal trigger information and / or accelerator pedal trigger information, and the number of times the trigger button is triggered, including:

[0083] If the combined trigger information includes brake pedal trigger information, and the number of times the trigger button is triggered is greater than the first preset number and less than the second preset number, then the target calibration category is determined to be the first speed calibration.

[0084] If the combined trigger information includes brake pedal trigger information, and the number of times the trigger button is triggered is greater than or equal to the second preset number, then the target calibration category is determined to be the first speed for continued calibration.

[0085] If the combined trigger information includes accelerator pedal trigger information, and the number of times the trigger button is triggered is greater than the first preset number and less than the second preset number, then the target calibration category is determined to be the second speed calibration.

[0086] If the combined trigger information includes accelerator pedal trigger information, and the number of times the trigger button is triggered is greater than or equal to the second preset number of times, then the target calibration category is determined to be the second speed for continued calibration.

[0087] If the combined trigger information includes brake pedal trigger information and accelerator pedal trigger information, and the number of times the trigger button is triggered is greater than the first preset number, then the target calibration category is determined to be continuous calibration.

[0088] The second preset number of times is greater than the first preset number of times.

[0089] Specifically, when determining the target calibration category based on the combined trigger information, the target calibration category can be determined based on the brake pedal trigger information and / or accelerator pedal trigger information, as well as the number of times the trigger button is triggered. When the combined trigger information includes brake pedal trigger information, it indicates that the brake pedal is depressed and the engine speed is low. In this case, if the number of times the trigger button is triggered is greater than a first preset number and less than a second preset number, the target calibration category is determined to be the first speed calibration; if the number of times the trigger button is triggered is greater than or equal to the second preset number, the target calibration category is determined to be the first speed continued calibration.

[0090] When the combined trigger information includes accelerator pedal trigger information, it indicates that the accelerator pedal is depressed and the engine speed is high. At this time, if the number of times the trigger button is triggered is greater than the first preset number and less than the second preset number, the target calibration category is determined to be the second speed calibration. If the number of times the trigger button is triggered is greater than or equal to the second preset number, the target calibration category is determined to be the second speed continued calibration.

[0091] When the combined trigger information includes both brake pedal trigger information and accelerator pedal trigger information, it indicates that both the brake pedal and accelerator pedal are depressed. In this case, if the number of trigger button presses exceeds a first preset number, the target calibration category is determined to be continuous calibration. This means that the steps corresponding to the first speed calibration are executed first to determine the initial fuel filling time at low speed (first speed), and then the steps corresponding to the second speed calibration are executed to determine the initial fuel filling time at high speed (second speed). Alternatively, the steps corresponding to the second speed calibration can be executed first, followed by the steps corresponding to the first speed calibration; this is not a limitation.

[0092] Based on the above technical solutions, the specific method for determining the initial oil filling time will be explained below, but this is not intended to limit this application.

[0093] Optionally, the filling time of each wet clutch in the vehicle is calibrated according to the target calibration category to determine the initial filling time of each wet clutch in the vehicle, including:

[0094] When the target calibration category is the first speed calibration or the second speed calibration, the calibration strategy is executed one by one for each wet clutch in a preset order;

[0095] When the target calibration category is either "Continue calibration at the first speed" or "Continue calibration at the second speed", the calibration strategy is executed one by one for each uncalibrated wet clutch.

[0096] Specifically, when the target calibration category is either the first speed calibration or the second speed calibration, a calibration strategy is executed for each wet clutch in a preset order. That is, for each wet clutch, a calibration strategy is executed to determine the initial calibration time for each wet clutch. The first speed calibration and the second speed calibration use the same calibration strategy, but at least some parameters of the calibration strategy differ between the two. When the target calibration category is either the first speed continued calibration or the second speed continued calibration, the calibration strategy is executed for each uncalibrated wet clutch in turn.

[0097] The calibration strategies include:

[0098] Step a1: Control the solenoid valve to open according to the preset oil filling current of the solenoid valve corresponding to the wet clutch, and fill the wet clutch with oil according to the preset oil filling time.

[0099] The preset oil filling time for the first oil filling corresponding to the first speed calibration differs from that for the first oil filling corresponding to the second speed calibration. However, the preset oil filling time for the first oil filling corresponding to the first speed calibration is the same as the preset oil filling time for the first oil filling corresponding to the continued calibration of the first speed. Similarly, the preset oil filling time for the first oil filling corresponding to the second speed calibration is the same as the preset oil filling time for the first oil filling corresponding to the continued calibration of the second speed. The preset oil filling time for the first oil filling is a parameter in the calibration strategy; that is, the parameters of the calibration strategy include the preset oil filling time for the first oil filling. The preset oil filling time for the first oil filling is a preset value, and the preset oil filling time for subsequent oil fillings is the time adjusted based on the preset oil filling time, i.e., the updated preset oil filling time.

[0100] Specifically, each wet clutch corresponds to a solenoid valve, specifically the solenoid valve on the working cylinder of each wet clutch. When the solenoid valve is open, it can fill the wet clutch with oil. The preset filling current is the current of the solenoid valve. By outputting the preset filling current to the solenoid valve, its opening can be controlled. The preset filling current of the solenoid valve corresponding to each wet clutch can be the same or different; this is not limited here. The wet clutch is filled with oil according to a preset filling time, which means controlling the solenoid valve to open for the preset filling time; the duration of filling the wet clutch with oil is the preset filling time.

[0101] Step a2: If at least one first change in engine speed during the oil filling process is less than a first set value, and at least one second change in engine torque during the oil filling process is less than a second set value, then add the first adjustment value to the current preset oil filling time to obtain the next preset oil filling time. After the wet clutch disengages, return to step a1 until each first change in engine speed during the oil filling process is greater than or equal to the first set value, and each second change in engine torque during the oil filling process is greater than or equal to the second set value. Wherein, the first set value corresponding to the first speed calibration is different from the first set value corresponding to the second speed calibration, and the second set value corresponding to the first speed calibration is different from the second set value corresponding to the second speed calibration.

[0102] Specifically, when filling the wet clutch with oil according to a preset filling time, the actual engine speed can be acquired at each sampling moment, and a first change in the actual engine speed can be calculated every preset duration (e.g., the preset duration is greater than or equal to the sampling interval). Throughout the entire preset filling time (i.e., during the filling process), at least one first change in the actual engine speed can be obtained. Similarly, during the filling process of the wet clutch, the actual engine torque can be acquired at each sampling moment, and a second change in the actual engine torque can be calculated every preset duration. Throughout the entire preset filling time, at least one second change in the actual torque can be obtained.

[0103] If at least one first change in engine speed during the oil filling process is less than a first set value, and at least one second change in engine torque during the oil filling process is less than a second set value, meaning there is at least one first change in actual engine speed less than the first set value and at least one second change in actual torque less than the second set value, then it is determined that the wet clutch has not reached the engagement state and is far from the engagement state, i.e., the wet clutch is underfilled. In this case, the current preset oil filling time is added to the first adjustment value to obtain the next preset oil filling time. The next oil filling operation is performed using the next preset oil filling time. That is, after the wet clutch disengages, the process returns to step a1. This cycle continues until each first change in engine speed during the oil filling process is greater than or equal to the first set value, and each second change in engine torque during the oil filling process is greater than or equal to the second set value. This ensures the wet clutch engages and avoids the problem of insufficient oil filling caused by a small initial oil filling time.

[0104] The first adjustment value is the same for each oil filling, which can reduce operations and improve calibration efficiency.

[0105] Alternatively, the first set value corresponding to the next oil filling is less than the first adjustment value corresponding to the current oil filling, so that the first adjustment value gradually decreases. When the preset oil filling time is relatively large, and the wet clutch is about to be engaged, a smaller first adjustment value is used to adjust the preset oil filling time to avoid excessive oil overflow. This allows for precise determination of the preset oil filling time.

[0106] The first setpoint corresponding to the first speed calibration differs from the first setpoint corresponding to the second speed calibration, and the second setpoint corresponding to the first speed calibration also differs from the second setpoint corresponding to the second speed calibration. Since the second speed calibration is performed at a higher speed and the first speed calibration is performed at a lower speed, the first setpoint corresponding to the first speed calibration can be less than the first setpoint corresponding to the second speed calibration, and vice versa. The first and second setpoints constitute the parameters in the calibration strategy. Specifically, the parameters of the calibration strategy include the preset filling time during the first filling when executing the calibration strategy, the first setpoint, and the second setpoint.

[0107] Step a3: Subtract the second adjustment value from the current preset oil filling time to obtain the next preset oil filling time. After the wet clutch disengages, return to step a1 until there is a first change in the actual engine speed that is less than the first set value and a second change in the actual engine torque that is less than the second set value. Then, take the current preset oil filling time as the initial oil filling time. Wherein, the second adjustment value is less than any of the first adjustment values.

[0108] Specifically, when the engine's actual speed changes by a first amount greater than or equal to a first set value during the oil filling process, and the engine's actual torque changes by a second amount greater than or equal to a second set value during the oil filling process, it indicates that the wet clutch has engaged. To prevent oil overflow, when the engine's actual speed changes by a first amount greater than or equal to the first set value and the engine's actual torque changes by a second amount greater than or equal to the second set value during the oil filling process, the preset oil filling time is adjusted further. The current preset oil filling time is subtracted from the second adjustment value to obtain the next preset oil filling time. After the wet clutch disengages, step a1 is returned to continue oil filling. This cycle continues until the engine's actual speed changes by a first amount less than the first set value and the engine's actual torque changes by a second amount less than the second set value. The current preset oil filling time is then used as the initial oil filling time. This avoids the problem of oil overflow during the use of the wet clutch due to an excessively large initial oil filling time.

[0109] Since the second adjustment value is less than any other adjustment value, the adjustment amount when reducing the preset filling time is very small. This makes it easy to find the initial filling time that allows the wet clutch to reach the engagement state without overflowing the filling oil. For example, when the preset filling time is 'a', if the engine's actual speed changes by at least one first amount during the filling process but is less than the first set value, and the engine's actual torque changes by at least one second amount during the filling process but is less than the second set value, adding the first adjustment value 'b' to 'a' results in an updated preset filling time of 'a+b'. If each first amount of change in the engine's actual speed during the filling process is greater than or equal to the first set value, and each second amount of change in the engine's actual torque during the filling process is greater than or equal to the second set value, subtracting the second adjustment value 'c' from the preset filling time 'a+b' results in an updated preset filling time of 'a+bc'. If there is a first amount of change in the engine's actual speed that is less than the first set value, and a second amount of change in the engine's actual torque that is less than the second set value, then 'a+bc' is used as the initial filling time. Here, 'a', 'b', and 'c' are all greater than 0, and 'c' is less than 'b'. This ensures that the initial filling time is neither too long nor too short.

[0110] It should be noted that when executing the calibration strategy, if after the first execution of step a1, the actual engine speed during each first change in the oil filling process is greater than or equal to the first set value, and the actual engine torque during each second change in the oil filling process is greater than or equal to the second set value, then step a3 is executed directly.

[0111] Based on the above technical solution, optionally, when the target calibration category is the second speed calibration or the second continuous speed calibration, before controlling the solenoid valve to open according to the preset oil filling current of the solenoid valve corresponding to the wet clutch, the following method is also included:

[0112] Control the engine speed to the preset speed.

[0113] Specifically, the preset speed is the speed corresponding to the travel of the accelerator pedal. When executing the calibration strategy corresponding to the second speed calibration or the second continued speed calibration, the engine speed is first controlled to the preset speed and then maintained at the preset speed. Under the condition that the engine speed is maintained at the preset speed, the calibration strategy is executed.

[0114] Optionally, calibrating the filling time of each wet clutch in the vehicle according to the target calibration category to determine the initial filling time of each wet clutch in the vehicle further includes:

[0115] When the target calibration category is continuous calibration, the calibration strategy is executed on each wet clutch in a preset order according to the preset filling time, first setting value and second setting value corresponding to the first speed calibration. Then, the calibration strategy is executed on each wet clutch in a preset order according to the preset filling time, first setting value and second setting value corresponding to the second speed calibration.

[0116] Specifically, when the target calibration type is continuous calibration, a first speed calibration can be performed first, followed by a second speed calibration. That is, based on the preset filling time, first set value, and second set value corresponding to the first speed calibration, the calibration strategy is executed sequentially for each wet clutch in a preset order. Then, the engine speed is controlled to a preset speed and maintained at that speed. Next, based on the preset filling time, first set value, and second set value corresponding to the second speed calibration, the calibration strategy is executed sequentially for each wet clutch in a preset order. In this way, the initial filling time of each wet clutch at low speed (first speed) and the initial filling time of each wet clutch at high speed (second speed) can be determined.

[0117] Optionally, if the current preset oil filling time is greater than the preset time threshold, the wet clutch calibration is determined to have failed.

[0118] Specifically, during the calibration process of the current wet clutch, if the current preset oil filling time exceeds a preset time threshold, the calibration of the current wet clutch is determined to have failed, and the calibration strategy is then executed on the next wet clutch in a preset order. After the calibration of a wet clutch is completed, the initial oil filling time of that wet clutch can be stored, and a calibration success message can be issued.

[0119] Based on the above technical solutions, the following describes possible ways to modify the initial oil filling time, but this is not intended to limit this application.

[0120] In one implementation, Figure 3 This is a flowchart of another wet clutch oil filling time calibration method provided by an embodiment of the present invention. Optionally, refer to... Figure 3 The calibration method for the oil filling time of a wet clutch includes:

[0121] S310. When the vehicle is in parking brake mode, the vehicle is in neutral gear and the transmission oil temperature is within the preset temperature range, if calibration trigger information is received, the target calibration category is determined according to the trigger information.

[0122] S320. The filling time of each wet clutch in the vehicle is calibrated according to the target calibration category to determine the initial filling time of each wet clutch in the vehicle.

[0123] S330. When the vehicle is running, determine whether the actual oil temperature of the transmission is lower than the calibrated oil temperature when the initial filling time is determined. If yes, proceed to step S340; otherwise, proceed to step S350.

[0124] Specifically, during actual vehicle operation, the actual oil temperature of the transmission is obtained, and it is determined whether the actual oil temperature of the transmission is lower than the calibrated oil temperature when the initial filling time is determined.

[0125] S340. Add the first correction value to the initial oil filling time to obtain the final oil filling time; where the lower the actual oil temperature, the larger the first correction value.

[0126] Specifically, when the actual oil temperature of the transmission is lower than the calibrated oil temperature at which the initial filling time is determined during vehicle operation, for each wet clutch, the initial filling time corresponding to that wet clutch is added to a first correction value corresponding to the actual oil temperature of the transmission to obtain the final filling time for that wet clutch. There is a correspondence between the actual oil temperature and the first correction value. This correspondence can be stored as a first preset correspondence. Therefore, the first correction value can be determined based on the actual oil temperature of the transmission and the first preset correspondence, thereby correcting the initial filling time.

[0127] By setting the first correction value to be larger when the actual oil temperature is lower, a larger final filling time can be used when the oil temperature and filling flow rate are lower, thereby avoiding insufficient filling of the wet clutch and enabling more precise control of the filling state of the wet clutch.

[0128] S350. Determine whether the actual oil temperature of the transmission is greater than the calibrated oil temperature when the initial filling time is determined. If yes, proceed to step S360; otherwise, proceed to step S370.

[0129] Specifically, during actual vehicle operation, the actual oil temperature of the transmission is obtained. If the actual oil temperature of the transmission is not less than the calibrated oil temperature at the time of determining the initial oil filling time, it is then determined whether the actual oil temperature of the transmission is greater than the calibrated oil temperature at the time of determining the initial oil filling time.

[0130] S360. Subtract the second correction value from the initial oil filling time to obtain the final oil filling time; where the higher the actual oil temperature, the larger the second correction value.

[0131] Specifically, when the actual oil temperature of the transmission is higher than the calibrated oil temperature at which the initial filling time is determined during vehicle operation, for each wet clutch, the final filling time of that wet clutch is obtained by subtracting the second correction value corresponding to the actual oil temperature of the transmission from the initial filling time of that wet clutch. There is a correspondence between the actual oil temperature and the second correction value. This correspondence can be stored as a second preset correspondence. Therefore, the second correction value can be determined based on the actual oil temperature of the transmission and the second preset correspondence, thereby correcting the initial filling time.

[0132] By setting the first correction value to be larger as the actual oil temperature increases, a smaller final filling time can be used when the oil temperature and filling flow rate are high, thereby avoiding oil overflow in the wet clutch and allowing for more precise control of the filling state of the wet clutch.

[0133] S370, the initial filling time is taken as the final filling time.

[0134] Specifically, if the actual oil temperature of the transmission is the same as the calibrated oil temperature when the initial filling time is determined during actual vehicle operation, the initial filling time will be used as the final filling time, and there is no need to correct the initial filling time.

[0135] In addition, when the vehicle is running and a shift signal is received from the operating lever, steps S330 to S370 can be executed to facilitate oil filling of the wet clutch corresponding to the shift signal according to the final oil filling time, and then the shift can be completed.

[0136] In another implementation, Figure 4 This is a flowchart of another wet clutch oil filling time calibration method provided by an embodiment of the present invention. Optionally, refer to... Figure 4 The calibration method for the oil filling time of a wet clutch includes:

[0137] S410. When the vehicle is in parking brake mode, the vehicle is in neutral gear, and the transmission oil temperature is within the preset temperature range, if calibration trigger information is received, the target calibration category is determined based on the trigger information.

[0138] S420. The filling time of each wet clutch in the vehicle is calibrated according to the target calibration category to determine the initial filling time of each wet clutch in the vehicle.

[0139] S430. When the vehicle is running, determine whether the actual oil temperature of the transmission is greater than the calibrated oil temperature when the initial filling time is determined. If yes, proceed to step S440; otherwise, proceed to step S480.

[0140] S440. Subtract the second correction value from the initial filling time to obtain the first intermediate filling time.

[0141] Specifically, when the actual oil temperature of the transmission is higher than the calibrated oil temperature at which the initial filling time is determined, for each wet clutch, the initial filling time corresponding to that wet clutch is subtracted from the second correction value corresponding to the actual oil temperature of the transmission to obtain the first intermediate filling time for that wet clutch. There is a correspondence between the actual oil temperature and the first correction value. This correspondence can be stored as a first preset correspondence. Based on the actual oil temperature and the first preset correspondence, the first correction value can be determined, thereby correcting the initial filling time to obtain the first intermediate filling time. The wet clutch corresponding to the shift signal is filled with oil according to the first intermediate filling time, and then the shift is completed.

[0142] S450. Determine whether each first change in the actual engine speed is greater than the first change threshold and each second change in the actual engine torque is greater than the second change threshold during the actual oil filling process; if yes, proceed to step S460; if no, proceed to step S470.

[0143] S460. Subtract the third correction value from the first intermediate filling time to obtain the final filling time.

[0144] Specifically, during the process of filling the wet clutch corresponding to the shift signal with oil according to the first intermediate filling time, the actual engine speed and actual torque can be collected at each sampling moment to obtain at least one first change and one second change within a preset time period. If, during the actual filling process, each first change in the actual engine speed is greater than a first change threshold, and each second change in the actual engine torque is greater than a second change threshold, it indicates that there may be overflow during filling. In this case, the first intermediate filling time is subtracted from the third correction value to obtain the final filling time. Subsequently, the wet clutch is filled with oil according to the final filling time corresponding to the wet clutch. This avoids excessive filling time, which could lead to overflow. Furthermore, the filling time can be corrected again based on the actual shift filling process, improving the accuracy of controlling the filling state of the wet clutch.

[0145] S470, take the first intermediate filling time as the final filling time.

[0146] Specifically, during the process of filling the wet clutch corresponding to the shift signal with oil according to the first intermediate filling time, the actual engine speed and actual torque can be collected at each sampling moment to obtain at least one first change and one second change within a preset time period. If, during the actual filling process according to the first intermediate filling time, there is no situation where each first change in the actual engine speed is greater than the first change threshold and each second change in the actual engine torque is greater than the second change threshold, then the first intermediate filling time is taken as the final filling time, and the wet clutch is subsequently filled with oil according to the final filling time corresponding to the wet clutch.

[0147] S480. Determine whether the actual oil temperature of the transmission is greater than the calibrated oil temperature. If yes, proceed to step S490; otherwise, proceed to step S494.

[0148] S490. Add the first correction value to the initial filling time to obtain the second intermediate filling time.

[0149] Specifically, when the actual oil temperature of the transmission is lower than the calibrated oil temperature at which the initial filling time is determined, for each wet clutch, the initial filling time corresponding to that wet clutch is added to a first correction value corresponding to the actual oil temperature of the transmission to obtain the second intermediate filling time for that wet clutch. There is a correspondence between the actual oil temperature and the second correction value. This correspondence can be stored as a second preset correspondence. Based on the actual oil temperature and the second preset correspondence, the second correction value can be determined, thereby correcting the initial filling time to obtain the second intermediate filling time. The wet clutch corresponding to the shift signal is filled with oil according to the second intermediate filling time, and then the shift is completed.

[0150] S491. Determine whether each first change in the actual engine speed is less than the first change threshold and each second change in the actual engine torque is less than the second change threshold during the actual oil filling process. If yes, proceed to step S492; otherwise, proceed to step S493.

[0151] S492. Add the fourth correction value to the second intermediate filling time to obtain the final filling time.

[0152] Specifically, during the process of filling the wet clutch corresponding to the shift signal with oil according to the second intermediate filling time, the actual engine speed and actual torque can be collected at each sampling moment to obtain at least one first change and one second change within a preset time period. If, during the actual filling process, each first change in the actual engine speed is greater than a first change threshold, and each second change in the actual engine torque is greater than a second change threshold, it indicates that there may be overflow during filling. In this case, a fourth correction value is added to the second intermediate filling time to obtain the final filling time. Subsequently, the wet clutch is filled with oil according to the final filling time corresponding to the wet clutch. This avoids insufficient filling due to a short filling time. Thus, the filling time can be corrected again based on the actual shift filling process, improving the accuracy of controlling the filling state of the wet clutch.

[0153] S493, take the second intermediate filling time as the final filling time.

[0154] Specifically, during the process of filling the wet clutch corresponding to the shift signal with oil according to the second intermediate filling time, the actual engine speed and actual torque can be collected at each sampling time to obtain at least one first change and one second change within a preset time period. If, during the actual filling process according to the second intermediate filling time, there is no situation where each first change in the actual engine speed is less than the first change threshold and each second change in the actual engine torque is less than the second change threshold, then the second intermediate filling time is taken as the final filling time, and the wet clutch is subsequently filled with oil according to the final filling time corresponding to the wet clutch.

[0155] S494. Use the initial filling time as the final filling time.

[0156] Specifically, if the actual oil temperature of the transmission is the same as the calibrated oil temperature when the initial filling time is determined during actual vehicle operation, the initial filling time will be used as the final filling time, and there is no need to correct the initial filling time.

[0157] This invention also provides a wet clutch filling time calibration device. The wet clutch is applied to a vehicle, which includes a transmission, and the transmission is equipped with at least one wet clutch. Figure 5 This is a schematic diagram of a wet clutch oil filling time calibration device provided in an embodiment of the present invention. (Refer to...) Figure 5 The wet clutch filling time calibration device includes:

[0158] The calibration category determination module 101 is used to determine the target calibration category based on the calibration trigger information if the vehicle status information meets the preset conditions.

[0159] The calibration module 102 is used to calibrate the oil filling time of each wet clutch in the vehicle according to the target calibration category, so as to determine the initial oil filling time of each wet clutch in the vehicle.

[0160] The correction module 103 is used to correct the initial oil filling time based on at least one of the actual oil temperature of the transmission and the actual operating parameters of the vehicle during vehicle operation, so as to obtain the final oil filling time; wherein the actual operating parameters include at least the actual speed and actual torque of the vehicle's engine.

[0161] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0162] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for calibrating the oil filling time of a wet clutch, characterized in that, The wet clutch is applied to a vehicle, the vehicle including a transmission, the transmission having at least one of the wet clutches; the method includes: When the vehicle's overall status information meets preset conditions, if calibration trigger information is received, the target calibration category is determined based on the trigger information. The filling time of each wet clutch in the vehicle is calibrated according to the target calibration category to determine the initial filling time of each wet clutch in the vehicle. When the vehicle is running, the initial filling time is corrected based on at least one of the actual oil temperature of the transmission and the actual operating parameters of the vehicle to obtain the final filling time; wherein the actual operating parameters include at least the actual speed and actual torque of the vehicle's engine.

2. The method according to claim 1, characterized in that, When the vehicle's overall status information meets preset conditions, if calibration trigger information is received, the target calibration category is determined based on the trigger information, including: When the vehicle is in parking brake mode, the vehicle is in neutral gear, and the transmission oil temperature is within a preset temperature range, if calibration trigger information is received, the target calibration category is determined based on the trigger information.

3. The method according to claim 1 or 2, characterized in that, The calibration trigger information includes instrument calibration information and / or combined trigger information; Determining the target labeling category based on the triggering information includes: The target calibration category is determined based on the instrument calibration information; wherein, the target calibration category includes first speed calibration, first speed continued calibration, second speed calibration, second speed continued calibration, and continuous calibration; And / or, the target calibration category is determined based on the vehicle's brake pedal trigger information and / or accelerator pedal trigger information, and the number of times the trigger button is triggered.

4. The method according to claim 3, characterized in that, Based on the vehicle's brake pedal trigger information and / or accelerator pedal trigger information, and the number of times the trigger button is triggered, the target calibration category is determined, including: If the combined trigger information includes brake pedal trigger information, and the number of times the trigger button is triggered is greater than a first preset number and less than a second preset number, then the target calibration category is determined to be the first speed calibration. If the combined trigger information includes brake pedal trigger information, and the number of times the trigger button is triggered is greater than or equal to the second preset number, then the target calibration category is determined to be the first speed calibration. If the combined trigger information includes accelerator pedal trigger information, and the number of times the trigger button is triggered is greater than a first preset number and less than a second preset number, then the target calibration category is determined to be the second speed calibration. If the combined trigger information includes accelerator pedal trigger information, and the number of times the trigger button is triggered is greater than or equal to the second preset number, then the target calibration category is determined to be the second rotational speed for continued calibration. If the combined trigger information includes the brake pedal trigger information and the accelerator pedal trigger information, and the number of times the trigger button is triggered is greater than a first preset number, then the target calibration category is determined to be continuous calibration.

5. The method according to claim 1, characterized in that, The filling time of each wet clutch in the vehicle is calibrated according to the target calibration category to determine the initial filling time of each wet clutch in the vehicle, including: When the target calibration category is either the first speed calibration or the second speed calibration, the calibration strategy is executed on each of the wet clutches in a preset order; When the target calibration category is either the first speed calibration or the second speed calibration, the calibration strategy is executed one by one for each uncalibrated wet clutch. The calibration strategy includes: The solenoid valve is opened according to the preset oil filling current of the solenoid valve corresponding to the wet clutch, and the wet clutch is filled with oil according to the preset oil filling time. If at least one first change in the actual engine speed during the oil filling process is less than a first set value, and at least one second change in the actual engine torque during the oil filling process is less than a second set value, then the current preset oil filling time is added to the first adjustment value to obtain the next preset oil filling time. After the wet clutch disengages, the process returns to the step of controlling the solenoid valve to open according to the preset oil filling current of the solenoid valve corresponding to the wet clutch, and oiling the wet clutch according to the preset oil filling time, until each first change in the actual engine speed during the oil filling process is greater than or equal to the first set value, and each second change in the actual engine torque during the oil filling process is greater than or equal to the second set value; wherein, the first set value corresponding to the first speed calibration is different from the first set value corresponding to the second speed calibration, and the second set value corresponding to the first speed calibration is different from the second set value corresponding to the second speed calibration. Subtract the second adjustment value from the current preset oil filling time to obtain the next preset oil filling time. After the wet clutch disengages, return to the step of controlling the solenoid valve to open according to the preset oil filling current of the solenoid valve corresponding to the wet clutch, and oil filling the wet clutch according to the preset oil filling time, until there is a first change in the actual speed of the engine that is less than the first set value, and a second change in the actual torque of the engine that is less than the second set value, and the current preset oil filling time is taken as the initial oil filling time; wherein, the second adjustment value is less than any of the first adjustment values.

6. The method according to claim 5, characterized in that, When the target calibration category is the second speed calibration or the second continued speed calibration, before controlling the opening of the solenoid valve according to the preset oil filling current of the solenoid valve corresponding to the wet clutch, the method further includes: The engine speed is controlled to a preset speed.

7. The method according to claim 5, characterized in that, The oil filling time of each wet clutch in the vehicle is calibrated according to the target calibration category to determine the initial oil filling time of each wet clutch in the vehicle, and the process further includes: When the target calibration category is continuous calibration, the calibration strategy is executed on each wet clutch in a preset order according to the preset oil filling time, first set value and second set value corresponding to the first speed calibration during the first oil filling. Then, the calibration strategy is executed on each wet clutch in a preset order according to the preset oil filling time, first set value and second set value corresponding to the second speed calibration during the first oil filling.

8. The method according to claim 5, characterized in that, If the current preset oil filling time is greater than the preset time threshold, then the wet clutch calibration is determined to have failed.

9. The method according to claim 1, characterized in that, The initial filling time is corrected based on at least one of the actual oil temperature of the transmission and the actual operating parameters of the vehicle to obtain the final filling time, including: When the actual oil temperature of the transmission is lower than the calibrated oil temperature at which the initial filling time was determined, the initial filling time is added to a first correction value to obtain the final filling time; wherein, the lower the actual oil temperature, the larger the first correction value; When the actual oil temperature of the transmission is greater than the calibrated oil temperature, the initial filling time is subtracted from the second correction value to obtain the final filling time; wherein, the higher the actual oil temperature, the larger the second correction value.

10. The method according to claim 1, characterized in that, The initial filling time is corrected based on at least one of the actual oil temperature of the transmission and the actual operating parameters of the vehicle to obtain the final filling time, including: When the actual oil temperature of the transmission is greater than the calibrated oil temperature at which the initial filling time was determined, the initial filling time is subtracted from the second correction value to obtain the first intermediate filling time. If, during the actual oil filling process, each first change in the actual engine speed is greater than the first change threshold, and each second change in the actual engine torque is greater than the second change threshold, then the first intermediate oil filling time is subtracted from the third correction value to obtain the final oil filling time. When the actual oil temperature of the transmission is lower than the calibrated oil temperature, the initial filling time is added to the first correction value to obtain the second intermediate filling time; If, during the actual oil filling process, each first change in the actual engine speed is less than the first change threshold, and each second change in the actual engine torque is less than the second change threshold, the second intermediate oil filling time is added to the fourth correction value to obtain the final oil filling time.

11. A wet clutch oil filling time calibration device, characterized in that, The wet clutch is applied to a vehicle, the vehicle including a transmission, the transmission having at least one of the wet clutches; the device includes: The calibration category determination module is used to determine the target calibration category based on the calibration trigger information if the vehicle's overall status information meets preset conditions. A calibration module is used to calibrate the oil filling time of each wet clutch in the vehicle according to the target calibration category, so as to determine the initial oil filling time of each wet clutch in the vehicle. A correction module is used to correct the initial filling time based on at least one of the actual oil temperature of the transmission and the actual operating parameters of the vehicle while the vehicle is running, to obtain a final filling time; wherein the actual operating parameters include at least the actual speed and actual torque of the vehicle's engine.

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