Wet clutch temperature calculation method, device, equipment and storage medium

Abstract

The application discloses a wet clutch temperature calculation method, device, equipment and storage medium, and relates to the technical field of vehicle control. The method comprises the following steps: obtaining a sliding friction power according to the difference between the main and driven disc rotating speeds and the instantaneous clutch torque; obtaining a temperature rise power according to the sliding friction power and the real-time cooling power; and obtaining the real-time temperature of the wet clutch according to the temperature rise power. The scheme realizes accurate control and management of the clutch temperature by monitoring and calculating the key parameters of the wet clutch, such as the difference between the main and driven disc rotating speeds, the instantaneous torque and the real-time cooling power, in combination with an advanced data processing and temperature estimation module. The beneficial effects include improving the accuracy of temperature estimation, optimizing the cooling efficiency, preventing overheating failure, reducing maintenance cost, improving the intelligent level and adaptability of the system, thereby enhancing the performance and reliability of the clutch.

Description

Technical Field

[0001] This application relates to the field of vehicle control technology, and in particular to a method, apparatus, equipment and storage medium for calculating the temperature of a wet clutch. Background Technology

[0002] With the rapid development of modern industry and transportation, the requirements for transmission system performance are becoming increasingly stringent, especially the reliability and stability of the clutch. As a key component of the transmission system, the performance of the clutch directly affects the efficiency and safety of the entire system. Temperature control is an important aspect of ensuring the normal operation of the clutch and extending its service life.

[0003] In existing technologies, clutch temperature estimation methods primarily focus on dry clutches. These methods are typically based on the characteristics of dry clutches, such as friction coefficient, heat capacity, and heat dissipation conditions. However, wet clutches differ significantly from dry clutches in their operating environment and mechanism, such as the cooling effect and friction characteristics of the liquid medium, making existing estimation methods unsuitable for direct application. Although temperature estimation methods for dry clutches are relatively mature in some applications, they are not applicable to wet clutches. The temperature control of wet clutches is more complex in high-temperature and high-humidity operating environments, requiring consideration of more factors, such as the heat transfer characteristics of the liquid medium and dynamically changing friction conditions.

[0004] Therefore, existing methods for estimating clutch temperature cannot meet the specific requirements of wet clutches. Designing a new method for calculating the temperature of wet clutches has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] The main objective of this application is to provide a method, apparatus, device, and storage medium for calculating the temperature of a wet clutch, aiming to solve the technical problem of how to design a temperature calculation method specifically for wet clutches.

[0006] To achieve the above objectives, this application provides a method for calculating the temperature of a wet clutch, the method comprising the following steps:

[0007] The slip friction power is obtained based on the speed difference between the driving and driven discs and the instantaneous clutch torque;

[0008] The temperature rise power is obtained based on the friction power and the real-time cooling power.

[0009] The real-time temperature of the wet clutch is obtained based on the temperature rise power.

[0010] Optionally, before obtaining the slip friction power based on the speed difference between the driving and driven discs and the instantaneous clutch torque, the method further includes:

[0011] Determine the weighting coefficients based on the engine speed and weighting coefficient table;

[0012] The active disk speed is obtained based on the engine speed, generator speed, and weighting coefficient.

[0013] The driven disc speed is obtained based on the drive motor speed, the ratio of the drive motor speed to the gearbox output shaft speed, and the ratio of the gearbox input shaft speed to the gearbox output shaft speed.

[0014] The speed difference between the driving and driven discs is obtained based on the speed of the driving disc and the speed of the driven disc.

[0015] Optionally, before obtaining the slip friction power based on the speed difference between the driving and driven discs and the instantaneous clutch torque, the method further includes:

[0016] Obtain real-time clutch pressure;

[0017] The conversion factor is determined based on the clutch motion state and the real-time clutch pressure.

[0018] The instantaneous clutch torque is obtained based on the conversion factor.

[0019] Optionally, determining the conversion factor based on the clutch motion state and the real-time clutch pressure includes:

[0020] When the clutch is in an inactive state, the conversion factor is obtained based on the static clutch parameters;

[0021] When the clutch is in the actuated state, the conversion factor is obtained based on the clutch temperature.

[0022] Optionally, obtaining the temperature rise power based on the friction power and the real-time cooling power includes:

[0023] The real-time cooling power is obtained based on the clutch temperature, real-time transmission oil temperature, cooling flow rate, coolant density, and specific heat capacity of the coolant from the previous calculation cycle.

[0024] The temperature rise power in the current calculation cycle is obtained based on the real-time cooling power and the friction power.

[0025] Optionally, obtaining the real-time temperature of the wet clutch based on the temperature rise power includes:

[0026] The temperature rise rate is obtained based on the temperature rise power, the total mass of the clutch, and the specific heat capacity of the clutch.

[0027] The real-time temperature of the wet clutch is obtained based on the temperature rise rate, the clutch temperature of the previous calculation cycle, and the calculation cycle.

[0028] Optionally, the step of obtaining the slip friction power based on the speed difference between the driving and driven discs and the instantaneous clutch torque further includes:

[0029] When the speed difference between the master and slave discs is less than the sliding friction threshold, the sliding friction power is set to the dead zone sliding friction power.

[0030] Furthermore, to achieve the above objectives, this application also provides a wet clutch temperature calculation device, the wet clutch temperature calculation device comprising:

[0031] The data processing module is used to obtain the slip friction power based on the speed difference between the driving and driven discs and the instantaneous clutch torque;

[0032] The data processing module is also used to obtain the temperature rise power based on the friction power and the real-time cooling power;

[0033] The temperature estimation module is used to obtain the real-time temperature of the wet clutch based on the temperature rise power.

[0034] In addition, to achieve the above objectives, this application also provides a wet clutch temperature calculation device, the device comprising: a memory, a processor, and a wet clutch temperature calculation program stored in the memory and executable on the processor, the wet clutch temperature calculation program being configured to implement the steps of the wet clutch temperature calculation method described above.

[0035] In addition, to achieve the above objectives, this application also provides a storage medium storing a wet clutch temperature calculation program, which, when executed by a processor, implements the steps of the wet clutch temperature calculation method described above.

[0036] This application obtains the slip friction power based on the speed difference between the driving and driven discs and the instantaneous clutch torque; obtains the temperature rise power based on the slip friction power and the real-time cooling power; and obtains the real-time temperature of the wet clutch based on the temperature rise power.

[0037] In summary, the process proposed in this application achieves precise control and management of clutch temperature by real-time monitoring and calculation of key parameters such as the speed difference between the driving and driven plates of the wet clutch, instantaneous torque, and real-time cooling power, combined with advanced data processing and temperature estimation modules. Its beneficial effects include improved accuracy in temperature estimation, optimized cooling efficiency, prevention of overheating failures, reduced maintenance costs, and enhanced system intelligence and adaptability, thereby improving clutch performance and reliability. Attached Figure Description

[0038] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0039] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a flowchart illustrating the first embodiment of the wet clutch temperature calculation method of this application;

[0041] Figure 2 This is a flowchart illustrating the second embodiment of the wet clutch temperature calculation method of this application;

[0042] Figure 3 This is a flowchart illustrating the third embodiment of the wet clutch temperature calculation method of this application;

[0043] Figure 4 This is a schematic diagram of the functional modules of the wet clutch temperature calculation device of this application;

[0044] Figure 5 This is a schematic diagram of the structure of the terminal device in the hardware operating environment involved in the embodiments of this application.

[0045] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0046] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0047] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0048] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device capable of performing the above functions, such as a wet clutch temperature calculation device. The following description uses a wet clutch temperature calculation device as an example to illustrate this embodiment and the subsequent embodiments.

[0049] This application provides a method for calculating the temperature of a wet clutch, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of this application.

[0050] In this embodiment, the method for calculating the temperature of the wet clutch includes:

[0051] Step S10: Obtain the slip friction power based on the speed difference between the driving and driven discs and the instantaneous clutch torque.

[0052] It's important to note that the speed difference between the driving and driven plates refers to the difference in rotational speed between the driving plate (usually connected to the engine or drive motor) and the driven plate (usually connected to the gearbox or output shaft) during clutch operation. This speed difference is a key parameter during clutch engagement and disengagement, directly affecting clutch performance and temperature. Instantaneous clutch torque refers to the torque value transmitted by the clutch to the driven plate at a specific moment. This torque value is dynamically changing, varying with factors such as the degree of clutch engagement, the output torque of the engine or drive motor, and the clutch's operating state.

[0053] Understandably, when the clutch is engaged, the driving and driven plates should rotate at the same speed. However, during engagement, or when the clutch is partially engaged (i.e., in a slipping state), a speed difference will occur between the driving and driven plates. This speed difference leads to friction and heat generation. When this speed difference exists, relative slippage occurs between the driving and driven plates; this phenomenon is called slippage. Slippage results in additional power loss, which is released as heat, causing the clutch temperature to rise.

[0054] It should be understood that during clutch engagement, if a speed difference exists, the clutch will enter a slipping state. In this slipping state, the instantaneous torque decreases as the speed difference increases. The level of instantaneous torque affects the clutch's slipping power, which in turn affects the clutch temperature; higher torque may lead to higher slipping power and temperature. Specifically, slipping power is the additional energy consumed during clutch engagement or disengagement due to asynchronous speeds. This energy is released as heat, causing the clutch temperature to rise.

[0055] In one embodiment, the slip friction power = (Difference in speed between the driving and driven discs) * Instantaneous clutch torque * 2 * π / 1000, in kW. Here, the instantaneous clutch torque is taken as an absolute value, representing the magnitude of the torque transmitted by the clutch at any given moment, regardless of its direction. Similarly, the difference in speed between the driving and driven discs is also taken as an absolute value, representing the difference in speed between the two discs, again without considering direction. Combining these parameters, the formula calculates the power loss caused by the speed difference during slip friction. Furthermore, when the speed difference between the driving and driven discs is less than the slip friction threshold, actual slip friction may not occur in the clutch. Therefore, the slip friction power in this stage is set to a very small value or a "dead zone" value, typically close to zero, indicating little or no energy loss.

[0056] In one embodiment, obtaining the speed difference between the driving and driven discs specifically includes: determining a weighting coefficient based on an engine speed and a weighting coefficient table; obtaining the driving disc speed based on the engine speed, generator speed, and weighting coefficient; obtaining the driven disc speed based on the drive motor speed, the ratio of the drive motor speed to the gearbox output shaft speed, and the ratio of the gearbox input shaft speed to the gearbox output shaft speed; and obtaining the speed difference between the driving and driven discs based on the driving disc speed and the driven disc speed.

[0057] It's important to note that, firstly, the driving disc speed needs to be determined. This speed is a weighted average of the generator speed and engine speed, with the weighting coefficients selected from a weighting coefficient table based on the engine speed. These weighting coefficients can be found in the specific weighting coefficient table for this transmission system, based on the current engine speed. Taking a hybrid vehicle as an example, the driven disc speed Noutput = abs|Np3 / i3|*ist, where Np3 is the drive motor speed, i3 is the speed ratio between the drive motor and the transmission output shaft, and ist is the speed ratio between the transmission input shaft and the transmission output shaft. The difference between the driving and driven disc speeds is then calculated by subtracting the driving disc speed from the driven disc speed.

[0058] It should be understood that the difference between the speeds of the master and slave disks should be a positive value, meaning that the difference result should be the absolute value.

[0059] Step S20: Obtain the temperature rise power based on the friction power and the real-time cooling power.

[0060] It should be noted that real-time cooling power indicates how much heat the cooling system can remove from the clutch at a given moment. This is achieved through the circulation of coolant, which absorbs the heat generated by the clutch and then carries it away.

[0061] It can be understood that the cooling power = max(0, Tclutch(T-1) - Toil + 273.15) * abs(dv) / 60 * D * C; where Tclutch(T-1) is the clutch temperature of the previous sampling cycle (in °C), Toil is the current transmission oil temperature (in °C), dv is the cooling flow rate (in L / min), D is the oil density (in kg / L, e.g., 0.86), and C is the oil's specific heat capacity (in kJ / kg / K).

[0062] It should be understood that the purpose of the entire formula is to calculate the maximum heat that the cooling system can remove from the clutch under the current conditions. The temperature rise power can be calculated by subtracting the sliding power obtained from the preceding steps.

[0063] Step S30: Obtain the real-time temperature of the wet clutch based on the temperature rise power.

[0064] It's important to note that when calculating the real-time temperature of a wet clutch, the increased thermal power, i.e., the difference between the slip friction power and the real-time cooling power, is first determined. Then, using this additional thermal power, combined with the total weight *m* of the friction plates and pressure plate in the clutch, the specific heat capacity *c* (in kilojoules per kilogram per Kelvin), and the sampling period *Ts*, the temperature increase for the current cycle can be calculated. Based on this temperature increase, and combined with the real-time temperature calculated in the previous cycle, the real-time temperature of the clutch is updated. In this way, the clutch temperature can be dynamically monitored and controlled, ensuring it remains within a safe and effective operating temperature range.

[0065] Understandably, since this calculation process requires the temperature results from the previous period, in the initial stage, that is, the ambient temperature at the current moment is taken as the temperature basis, and the temperature increase is continuously accumulated on this basis.

[0066] This application obtains the slip friction power based on the speed difference between the driving and driven discs and the instantaneous clutch torque; obtains the temperature rise power based on the slip friction power and the real-time cooling power; and obtains the real-time temperature of the wet clutch based on the temperature rise power.

[0067] In summary, the wet clutch temperature calculation method proposed in this application accurately predicts and adjusts the clutch temperature state in real time by calculating slip friction power and temperature rise power in real time and combining this with the efficiency of the cooling system. This intelligent temperature management not only improves the efficiency and reliability of the transmission system but also extends the clutch's service life, reduces maintenance costs, and ensures operational safety. Furthermore, the solution is highly adaptable and can flexibly cope with different operating conditions, providing an innovative temperature control solution for wet clutches.

[0068] Reference Figure 2 , Figure 2 This is a flowchart illustrating the second embodiment of the wet clutch temperature calculation method of this application. Based on the first embodiment described above, a second embodiment of the wet clutch temperature calculation method of this application is proposed.

[0069] In this embodiment, before step S10, the method further includes:

[0070] Step S001: Obtain real-time clutch pressure.

[0071] It should be noted that real-time clutch pressure refers to the instantaneous pressure value acting on the clutch friction plates during clutch operation. This pressure is typically provided by the clutch operating mechanism (such as a hydraulic or pneumatic system) and directly affects the clutch's engagement and disengagement efficiency.

[0072] Step S002: Determine the conversion factor based on the clutch motion state and the real-time clutch pressure.

[0073] It should be noted that the clutch's motion state usually refers to whether the clutch is in an engaged, disengaged, or slipping state. However, this embodiment only considers the engaged and slipping states, which correspond to the inactive and active states, respectively. Furthermore, the conversion factor is a coefficient determined based on the clutch's design parameters and real-time monitored operating conditions (such as pressure and temperature). The conversion factor is also affected by parameters such as the characteristics of the friction material, the number and area of ​​the friction plates, and the clutch radius.

[0074] Furthermore, when the clutch is in an inactive state, the conversion factor is obtained based on the static clutch parameters; when the clutch is in an active state, the conversion factor is obtained based on the clutch temperature.

[0075] It is understandable that when the clutch is in an inactive state, the entire system is driven by static friction. The conversion factor k when the clutch is inactive is calculated as follows: k = kt * r * Cn * s * rfc * I * 1000, where rfc is the friction factor of the clutch surface material; Cn is the number of clutch friction plates; s is the area of ​​the friction plates; I is the net radius of the clutch; r is the ratio of static friction to dynamic friction, usually 1; and kt is the influence factor of clutch temperature on friction. This calculation method takes into account the physical characteristics and operating conditions of the clutch to determine the conversion factor in the inactive state and calculate the instantaneous torque of the clutch accordingly.

[0076] It should be understood that when the clutch is engaged, i.e., transmitting torque, its temperature can significantly affect the coefficient of friction, and the coefficient of friction of the friction material changes with increasing temperature. Typically, the coefficient of friction of some friction materials may decrease with increasing temperature, which reduces torque transmission capability. If the specific values ​​of the coefficient of friction of the friction material at different temperatures can be experimentally calibrated, the conversion factor can be adjusted based on the real-time temperature and the known temperature-friction coefficient relationship to ensure accurate torque calculation even under temperature variations.

[0077] Step S003: Obtain the instantaneous clutch torque based on the conversion factor.

[0078] It is understandable that the instantaneous clutch torque = (current clutch pressure - engagement point pressure) * conversion factor, and the calculated instantaneous clutch torque is the instantaneous torque output of the clutch at that moment.

[0079] This embodiment provides a method for calculating the temperature of a wet clutch. First, the real-time clutch pressure is obtained; then, a conversion factor is determined based on the clutch motion state and the real-time clutch pressure; finally, the instantaneous clutch torque is obtained based on the conversion factor.

[0080] In summary, by monitoring clutch pressure and temperature in real time and dynamically determining the conversion factor based on different clutch operating states, accurate calculation of the clutch's instantaneous torque is achieved. This method not only considers physical properties such as friction material characteristics, the number and area of ​​friction plates, and clutch radius, but also the influence of temperature on the coefficient of friction. This ensures accurate control of the clutch's torque output under various operating conditions, improving transmission efficiency and system responsiveness. It also helps extend the clutch's service life and enhances the overall vehicle's driving safety and comfort.

[0081] Reference Figure 3 , Figure 3 This is a flowchart illustrating the third embodiment of the wet clutch temperature calculation method of this application. Based on the first embodiment described above, a third embodiment of the wet clutch temperature calculation method of this application is proposed.

[0082] In this embodiment, step S20 includes:

[0083] Step S201: Obtain the real-time cooling power based on the clutch temperature, real-time transmission oil temperature, cooling flow rate, coolant density, and specific heat capacity of the coolant from the previous calculation cycle.

[0084] It should be noted that the clutch temperature in the previous calculation cycle refers to the calculated clutch temperature, not the sampled clutch temperature. The real-time transmission oil temperature is the current temperature of the coolant in the transmission, usually monitored in real time by a temperature sensor. Cooling flow rate refers to the volume of coolant flowing through the clutch per unit time, usually measured in liters per minute (L / min). The density of the coolant affects its heat capacity, i.e., the mass of coolant per unit volume, usually measured in kilograms per liter (kg / L). Combining this with its specific heat capacity, the maximum heat that the cooling system can remove from the clutch at the current moment can be calculated, which is the real-time cooling power that needs to be determined.

[0085] Step S202: Based on the real-time cooling power and the friction power, obtain the temperature rise power in the current calculation cycle.

[0086] Understandably, the temperature rise power is the difference between the slip friction power and the real-time cooling power, representing the actual increase in heat generated by the clutch during the current calculation cycle. If the cooling power is greater than the slip friction power, the temperature rise power may be zero or negative, indicating that the clutch will not heat up but may instead cool down.

[0087] In this embodiment, step S30 includes:

[0088] Step S301: Obtain the temperature rise rate based on the temperature rise power, total mass of the clutch, and specific heat capacity of the clutch.

[0089] It should be noted that the heat inflow over a period of time can be calculated by using the temperature rise power. Combined with the total mass of the clutch and the specific heat capacity of the clutch, the temperature change of the clutch as a whole can be calculated. Dividing this by the time period will give the temperature rise rate.

[0090] It is understood that since the clutch in this embodiment specifically refers to a wet clutch, the concept of specific heat capacity also applies to wet clutches. However, since wet clutches involve liquid cooling media (usually transmission fluid), the role of specific heat capacity in thermal management calculations may be slightly different. It is necessary to comprehensively consider the thermal characteristics of the clutch assembly and the cooling medium, including their specific heat capacity, thermal conductivity, and thermal expansion characteristics.

[0091] Step S302: Based on the temperature rise rate, the clutch temperature of the previous calculation cycle, and the calculation cycle, obtain the real-time temperature of the wet clutch.

[0092] Understandably, calculating real-time temperature is a dynamic process that considers the continuous change in clutch temperature over the time interval from the previous measurement cycle to the present. When calculating real-time temperature, all factors affecting temperature changes must be considered, including slip power, cooling efficiency, the heat capacity of the friction material, and the characteristics of the cooling medium.

[0093] It should be understood that Tcurrent = Tprevious + (temperature rise rate × calculation cycle), where Tcurrent is the real-time temperature of the current cycle and Tprevious is the clutch temperature of the previous cycle. This method ensures that the wet clutch is properly monitored and controlled under various operating conditions to maintain its performance and extend its service life.

[0094] This embodiment provides a method for calculating the temperature of a wet clutch. First, the real-time cooling power is obtained based on the clutch temperature of the previous calculation cycle, the real-time transmission oil temperature, cooling flow rate, coolant density, and the specific heat capacity of the coolant. Then, the temperature rise power for the current calculation cycle is obtained based on the real-time cooling power and the slippage power. The temperature rise rate is obtained based on the temperature rise power, the total mass of the clutch, and the specific heat capacity of the clutch. Finally, the real-time temperature of the wet clutch is obtained based on the temperature rise rate, the clutch temperature of the previous calculation cycle, and the calculation cycle.

[0095] In summary, by comprehensively considering real-time cooling power, slip friction power, clutch mass, specific heat capacity, and cooling medium characteristics, accurate calculations of clutch temperature rise rate and real-time temperature are achieved. This optimizes thermal management, improves clutch reliability and performance, extends service life, reduces maintenance costs, and ensures driving safety and system adaptability.

[0096] Reference Figure 4 This application also provides a wet clutch temperature calculation device, the wet clutch temperature calculation device comprising:

[0097] Data processing module 10 is used to obtain the slip friction power based on the speed difference between the driving and driven discs and the instantaneous clutch torque;

[0098] The data processing module 10 is also used to obtain the temperature rise power based on the friction power and the real-time cooling power;

[0099] Temperature estimation module 20 is used to obtain the real-time temperature of the wet clutch based on the temperature rise power.

[0100] In one embodiment, the data processing module 10 is further configured to determine a weighting coefficient based on an engine speed and a weighting coefficient table; obtain the driving disc speed based on the engine speed, generator speed, and weighting coefficient; obtain the driven disc speed based on the drive motor speed, the ratio of the drive motor speed to the gearbox output shaft speed, and the ratio of the gearbox input shaft speed to the gearbox output shaft speed; and obtain the difference between the driving and driven disc speeds based on the driving disc speed and the driven disc speed.

[0101] In one embodiment, the data processing module 10 is further configured to acquire real-time clutch pressure; determine a conversion factor based on the clutch motion state and the real-time clutch pressure; and obtain instantaneous clutch torque based on the conversion factor.

[0102] In one embodiment, the data processing module 10 is further configured to obtain the conversion factor based on static clutch parameters when the clutch is in an inactive state, and to obtain the conversion factor based on clutch temperature when the clutch is in an active state.

[0103] In one embodiment, the data processing module 10 is further configured to obtain real-time cooling power based on the clutch temperature, real-time transmission oil temperature, cooling flow rate, coolant density, and specific heat capacity of the coolant in the previous calculation cycle; and to obtain the temperature rise power in the current calculation cycle based on the real-time cooling power and the slippage power.

[0104] In one embodiment, the temperature estimation module 20 is further configured to obtain the temperature rise rate based on the temperature rise power, the total mass of the clutch, and the specific heat capacity of the clutch; and to obtain the real-time temperature of the wet clutch based on the temperature rise rate, the clutch temperature of the previous calculation cycle, and the calculation cycle.

[0105] In one embodiment, the temperature estimation module 20 is further configured to set the sliding friction power as the dead zone sliding friction power when the difference in rotational speed between the master and slave disks is less than the sliding friction threshold.

[0106] This application also provides a wet clutch temperature calculation device, the device comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the wet clutch temperature calculation method in the first embodiment described above.

[0107] The following is for reference. Figure 5 The diagram illustrates a structural schematic of a wet clutch temperature calculation device suitable for implementing embodiments of this application. The wet clutch temperature calculation device in the embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), in-vehicle terminals (e.g., in-vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 5 The wet clutch temperature calculation device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0108] like Figure 5As shown, the wet clutch temperature calculation device may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. The RAM 1004 also stores various programs and data required for the operation of the wet clutch temperature calculation device. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touchscreen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. The communication device 1009 allows the wet clutch temperature calculation device to communicate wirelessly or wiredly with other devices to exchange data. Although the figure shows a wet clutch temperature calculation device with various systems, it should be understood that it is not required to implement or possess all of the systems shown. More or fewer systems may be implemented alternatively.

[0109] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0110] The wet clutch temperature calculation device provided in this application, employing the wet clutch temperature calculation method described in the above embodiments, can solve the technical problem in the art of how to design a temperature calculation method specifically for wet clutches. Compared with the prior art, the beneficial effects of the wet clutch temperature calculation device provided in this application are the same as those of the wet clutch temperature calculation method provided in the above embodiments, and other technical features of this wet clutch temperature calculation device are the same as those disclosed in the previous embodiment method, and will not be repeated here.

[0111] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0112] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0113] This application also provides a storage medium storing a wet clutch temperature calculation program, which, when executed by a processor, implements the steps of the wet clutch temperature calculation method described in any one of the above descriptions.

[0114] The storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of storage media may include, but are not limited to: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0115] The aforementioned storage medium may be included in the wet clutch temperature calculation device; or it may exist independently and not be assembled into the wet clutch temperature calculation device.

[0116] The aforementioned computer-readable storage medium carries one or more programs, which, when executed by the wet clutch temperature calculation device, cause the wet clutch temperature calculation device to: obtain the slip friction power based on the difference in speed between the driving and driven discs and the instantaneous clutch torque; obtain the temperature rise power based on the slip friction power and the real-time cooling power; and obtain the real-time temperature of the wet clutch based on the temperature rise power.

[0117] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0118] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0119] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0120] The storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the above-described wet clutch temperature calculation method, thereby solving the technical problem of how to design a temperature calculation method specifically for wet clutches. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the wet clutch temperature calculation method provided in the above embodiments, and will not be repeated here.

[0121] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A method for calculating the temperature of a wet clutch, characterized in that, The method for calculating the temperature of the wet clutch includes: Obtain real-time clutch pressure; The conversion factor is determined based on the clutch motion state and the real-time clutch pressure. The determination of the conversion factor based on the clutch motion state and the real-time clutch pressure includes: When the clutch is in an inactive state, the conversion factor is obtained based on the static clutch parameters; When the clutch is in the actuated state, the conversion factor is obtained based on the clutch temperature; The instantaneous clutch torque is obtained based on the conversion factor. Determine the weighting coefficients based on the engine speed and weighting coefficient table; The active disk speed is obtained based on the engine speed, generator speed, and weighting coefficient. The driven disc speed is obtained based on the drive motor speed, the ratio of the drive motor speed to the gearbox output shaft speed, and the ratio of the gearbox input shaft speed to the gearbox output shaft speed. The speed difference between the driving and driven disks is obtained based on the speed of the driving disk and the speed of the driven disk. The slip friction power is obtained based on the speed difference between the driving and driven discs and the instantaneous clutch torque; The temperature rise power is obtained based on the friction power and the real-time cooling power. The real-time temperature of the wet clutch is obtained based on the temperature rise power.

2. The method for calculating the temperature of a wet clutch according to claim 1, characterized in that, The step of obtaining the temperature rise power based on the friction power and the real-time cooling power includes: The real-time cooling power is obtained based on the clutch temperature, real-time transmission oil temperature, cooling flow rate, coolant density, and specific heat capacity of the coolant from the previous calculation cycle. The temperature rise power in the current calculation cycle is obtained based on the real-time cooling power and the friction power.

3. The method for calculating the temperature of a wet clutch according to claim 1, characterized in that, The step of obtaining the real-time temperature of the wet clutch based on the temperature rise power includes: The temperature rise rate is obtained based on the temperature rise power, the total mass of the clutch, and the specific heat capacity of the clutch. The real-time temperature of the wet clutch is obtained based on the temperature rise rate, the clutch temperature of the previous calculation cycle, and the calculation cycle.

4. The method for calculating the temperature of a wet clutch according to any one of claims 1 to 3, characterized in that, The method of obtaining the slip friction power based on the speed difference between the driving and driven discs and the instantaneous clutch torque also includes: When the speed difference between the master and slave discs is less than the sliding friction threshold, the sliding friction power is set to the dead zone sliding friction power.

5. A wet clutch temperature calculation device, characterized in that, The wet clutch temperature calculation device includes: The data processing module is used to obtain the slip friction power based on the speed difference between the driving and driven discs and the instantaneous clutch torque; The data processing module is further configured to: acquire real-time clutch pressure; determine a conversion factor based on the clutch motion state and the real-time clutch pressure; obtain instantaneous clutch torque based on the conversion factor; determine a weighting coefficient based on the engine speed and a weighting coefficient table; obtain the driving plate speed based on the engine speed, generator speed, and weighting coefficient; obtain the driven plate speed based on the drive motor speed, the ratio of the drive motor speed to the gearbox output shaft speed, and the ratio of the gearbox input shaft speed to the gearbox output shaft speed; and obtain the driving-driven plate speed difference based on the driving plate speed and the driven plate speed. The data processing module is further configured to obtain the conversion factor based on static clutch parameters when the clutch is in an inactive state; and to obtain the conversion factor based on clutch temperature when the clutch is in an active state. The data processing module is also used to obtain the temperature rise power based on the friction power and the real-time cooling power; The temperature estimation module is used to obtain the real-time temperature of the wet clutch based on the temperature rise power.

6. A wet clutch temperature calculation device, characterized in that, The wet clutch temperature calculation device includes: a memory, a processor, and a wet clutch temperature calculation program stored in the memory and executable on the processor, the wet clutch temperature calculation program being configured to implement the steps of the wet clutch temperature calculation method as described in any one of claims 1 to 4.

7. A storage medium, characterized in that, The storage medium stores a wet clutch temperature calculation program, which, when executed by a processor, implements the steps of the wet clutch temperature calculation method as described in any one of claims 1 to 4.

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