Method for determining temperature of transmission lubricating oil, determining device, and vehicle

Abstract

The application discloses a kind of temperature determination method, determining device and vehicle of transmission lubricating oil.It is determined that method includes: collecting vehicle operating state information, engine operating state information, the working state information of component in transmission, transmission housing information, radiator working state information, the physical characteristics of transmission assembly parts, oil temperature that oil temperature sensor collects, ambient temperature;Based on vehicle operating state information, engine operating state information, the working state information of component in transmission, determine transmission heating power;Based on transmission heating power, transmission housing information, radiator working state information, ambient temperature and oil temperature, determine transmission heat dissipation power;Based on the physical characteristics of transmission assembly parts and transmission heat dissipation power, determine transmission oil temperature rise;Based on oil temperature and transmission oil temperature rise, determine the actual oil temperature of lubricating oil.The application solves the problem of inaccurate oil temperature detection under harsh conditions of related technology.

Description

Technical Field

[0001] This invention relates to the field of vehicle transmission oil temperature detection technology, and more specifically, to a method, device, and vehicle for determining the temperature of transmission lubricating oil. Background Technology

[0002] Existing automatic transmissions are all equipped with oil temperature sensors to monitor the lubricating oil temperature in real time. The automatic transmission control unit monitors the working status of each shifting element and clutch element in real time based on the collected lubricating oil temperature, and performs corresponding protection based on the lubricating oil temperature, such as clutch friction plate temperature protection, shifting component protection, and hybrid transmission motor cooling protection.

[0003] There are two existing arrangements of oil temperature sensors:

[0004] The first approach involves placing the sensor on the lubricating oil-immersed portion of the control valve body. An oil temperature sensor is installed at atmospheric pressure. This approach integrates the sensor onto the valve body, resulting in a simple layout, reliable wiring connections, and low cost due to its atmospheric pressure signal acquisition. However, it has the following drawbacks: 1. Fixed-point temperature acquisition, only collecting temperature data near the sensor, making it more suitable for steady-state conditions and lubricating oil equilibrium temperature monitoring; 2. Inability to detect excessively high local temperatures; 3. Instantaneous temperatures are difficult to monitor.

[0005] The second option involves placing a high-pressure oil temperature sensor inside the hydraulic pump outlet pipeline. This option provides reliable monitoring signals, and the temperature information collected by the oil temperature sensor provides more accurate protection for transmission components. However, due to its placement environment, it needs to meet requirements such as high pressure, sealing, and signal line layout, resulting in higher costs, installation difficulties, poor manufacturability, and a tendency to leak and fail, causing malfunctions in the hydraulic system.

[0006] In summary, for automatic transmissions, addressing the reliability issue of clutch overheating under harsh operating conditions remains a critical challenge. Currently, no effective solution has been proposed to address this problem. Summary of the Invention

[0007] This invention provides a method, apparatus, and vehicle for determining the temperature of transmission lubricating oil, thereby at least solving the technical problem of inaccurate oil temperature detection under harsh operating conditions in related technologies.

[0008] According to one aspect of the present invention, a method for determining the temperature of transmission lubricating oil is provided, characterized in that the method includes the following steps: collecting vehicle operating status information, engine operating status information, operating status information of components inside the transmission, transmission housing information, radiator operating status information, physical characteristics of transmission assembly components, oil temperature collected by an oil temperature sensor, and ambient temperature, wherein the oil temperature sensor is disposed at the end of the transmission control valve body immersed in lubricating oil, and the oil temperature sensor is used to collect the oil temperature of the lubricating oil inside the transmission; determining the transmission heat generation power based on the vehicle operating status information, engine operating status information, and operating status information of components inside the transmission; determining the transmission heat dissipation power based on the transmission heat generation power, transmission housing information, radiator operating status information, ambient temperature, and oil temperature; determining the transmission oil temperature rise based on the physical characteristics of the transmission assembly components and the transmission heat dissipation power; and determining the actual oil temperature of the lubricating oil based on the oil temperature and the transmission oil temperature rise.

[0009] Optionally, the heat output power of the transmission is determined based on vehicle operating status information, engine operating status information, and the working status information of components within the transmission, including the following steps: inputting vehicle operating status information and engine operating status information into a first calculation model and outputting a first heat output power of the transmission; inputting the working status information of components within the transmission into a second calculation model and outputting a second heat output power of the transmission; and determining the heat output power of the transmission based on the first heat output power and the second heat output power of the transmission.

[0010] Optionally, the transmission heating power is determined based on the transmission first heating power and the transmission second heating power, including: collecting vehicle speed information; determining the transmission first heating power as the transmission heating power when the vehicle speed is greater than a preset vehicle speed value; and determining the transmission second heating power as the transmission heating power when the vehicle speed is less than the preset vehicle speed value.

[0011] Optionally, inputting vehicle operating status information and engine operating status information into a first calculation model and outputting the first heat-generating power of the transmission includes: inputting vehicle operating status information into a first power model and outputting the transmission output power; inputting engine operating status information into a second power model and outputting the transmission input power; and inputting the transmission output power and transmission input power into a third power model and outputting the first heat-generating power of the transmission.

[0012] Optionally, the transmission cooling power is determined based on the transmission heat generation power, transmission housing information, radiator operating status information, ambient temperature, and oil temperature, including: inputting the transmission housing information, ambient temperature, and oil temperature into a first cooling model and outputting the transmission housing cooling power; inputting the radiator operating status information and oil temperature into a second cooling model and outputting the radiator cooling power; and inputting the transmission housing cooling power, radiator cooling power, and transmission heat generation power into a third cooling model and outputting the transmission cooling power.

[0013] Optionally, the operating status information of the components within the transmission includes at least clutch operating status information, bearing operating status information, and shaft / gear operating status information. The operating status information of the components within the transmission is input into a second calculation model to output a second heat generation power of the transmission. This includes: inputting clutch operating status information into a clutch heat generation model and outputting clutch heat generation power; inputting shaft / gear operating status information into a first gear heat generation model and outputting gear meshing friction heat generation power; inputting shaft / gear operating status information into a second gear heat generation model and outputting gear oil churning heat generation power; inputting bearing operating status information into a bearing heat generation model and outputting bearing heat generation power; and inputting the clutch heat generation power, gear meshing friction heat generation power, gear oil churning heat generation power, and bearing heat generation power into a heat generation calculation model to output the second heat generation power of the transmission.

[0014] Optionally, the vehicle operating status information includes at least one of the following: vehicle speed, steering wheel angle, tire steering angle, brake pedal signal, brake master cylinder pressure signal, accelerator pedal opening, wheel speed difference, X-direction acceleration signal, and Y-direction acceleration signal; the engine operating status information includes at least one of the following: engine speed, combustion torque, torque loss, throttle opening, and coolant temperature.

[0015] Optionally, the transmission housing information includes at least the housing area; the radiator operating status information includes at least one of the following: cooler inlet water temperature, coolant flow rate, heat exchange oil flow rate; and the physical characteristics of the transmission assembly components include at least one of the following: specific heat capacity, mass.

[0016] According to another aspect of the present invention, a device for determining the temperature of transmission lubricating oil is also provided, comprising: a data acquisition module for acquiring vehicle operating status information, engine operating status information, operating status information of components within the transmission, transmission housing information, radiator operating status information, physical characteristics of transmission assembly components, oil temperature acquired by an oil temperature sensor, and ambient temperature, wherein the oil temperature sensor is disposed at the lubricating oil-immersed end of the transmission control valve body and is used to acquire the oil temperature of the lubricating oil within the transmission; a first calculation module for determining the transmission heat generation power based on the vehicle operating status information, engine operating status information, and operating status information of components within the transmission; a second calculation module for determining the transmission heat dissipation power based on the transmission heat generation power, transmission housing information, radiator operating status information, ambient temperature, and oil temperature; a third calculation module for determining the transmission oil temperature rise based on the physical characteristics of the transmission assembly components and the transmission heat dissipation power; and an oil temperature calculation module for determining the actual oil temperature of the lubricating oil based on the oil temperature and the transmission oil temperature rise.

[0017] According to another aspect of the present invention, a vehicle is also provided, including a transmission, wherein the temperature of the transmission lubricating oil is determined using the above-described method for determining the temperature of the transmission lubricating oil.

[0018] In this embodiment of the invention, the power generated by the transmission, the power dissipated by the transmission, and the temperature rise of the transmission oil are calculated respectively. Based on the oil temperature and the temperature rise of the transmission oil, the actual temperature of the lubricating oil is calculated. By compensating the oil temperature with the temperature rise of the transmission oil, the actual temperature of the transmission lubricating oil can be accurately determined. The accuracy meets the temperature protection requirements of the transmission components, thereby solving the technical problem of inaccurate oil temperature detection under harsh operating conditions in related technologies. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0020] Figure 1 This is a hardware structure block diagram of an electronic device for a vehicle according to one embodiment of the present invention;

[0021] Figure 2 This is a flowchart of a method for determining the temperature of transmission lubricating oil according to one embodiment of the present invention;

[0022] Figure 3 This is a structural block diagram of a transmission lubricating oil temperature determination device according to one embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of a transmission lubricating oil temperature profile according to one optional embodiment of the present invention;

[0024] Figure 5a and Figure 5b This is a schematic diagram showing the location of the oil temperature sensor when the vehicle is in a horizontal position.

[0025] Figure 6a and Figure 6b This is a schematic diagram showing the location of the oil temperature sensor when the vehicle is under harsh operating conditions.

[0026] The above figures include the following reference numerals:

[0027] 1. Transmission fluid level; 2. Transmission housing; 3. Oil temperature sensor; 4. Oil pump; 5. Control valve body; 6. Clutch. Detailed Implementation

[0028] 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.

[0029] 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 a 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.

[0030] According to one embodiment of the present invention, an embodiment of a method for determining the temperature of transmission lubricating oil is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0031] This method embodiment can be executed in an electronic device or similar computing device that includes memory and a processor within a vehicle. Taking an electronic device running in a vehicle as an example, such as... Figure 1 As shown, the vehicle's electronic devices may include one or more processors 102 (processors may include, but are not limited to, central processing units (CPUs), graphics processing units (GPUs), digital signal processing (DSP) chips, microprocessors (MCUs), programmable logic devices (FPGAs), neural network processors (NPUs), tensor processors (TPUs), artificial intelligence (AI) type processors, etc.) and a memory 104 for storing data. Optionally, the vehicle's electronic devices may also include a transmission device 106 for communication functions, an input / output device 108, and a display 110. Those skilled in the art will understand that... Figure 1 The structures shown are for illustrative purposes only and do not limit the structure of the electronic devices in the vehicle described above. For example, the electronic devices in a vehicle may include more or fewer components than those described above, or have a different configuration than those described above.

[0032] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the information processing method in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the aforementioned information processing method. The memory 104 may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0033] The transmission device 106 is used to receive or send data via a network. Specific examples of the network described above may include a wireless network provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 106 may be a Radio Frequency (RF) module used for wireless communication with the Internet.

[0034] Display 110 may be, for example, a touchscreen liquid crystal display (LCD). This LCD allows a user to interact with the user interface of the mobile terminal. In some embodiments, the mobile terminal has a graphical user interface (GUI), which allows the user to interact with the GUI via finger contact and / or gestures on a touch-sensitive surface. The human-computer interaction functions may optionally include: creating web pages, drawing, word processing, creating electronic documents, playing games, video conferencing, instant messaging, sending and receiving emails, a call interface, playing digital video, playing digital music, and / or web browsing, etc. Executable instructions for performing the above-mentioned human-computer interaction functions are configured / stored in one or more processor-executable computer program products or readable storage media.

[0035] To facilitate the explanation of the technical problem solved in this embodiment, the existing vehicle transmission oil temperature detection method is described below: When the vehicle is in a horizontal state (e.g., Figure 5a As shown in the figure, the positions of the transmission fluid level and oil temperature sensors and hydraulic components are as follows: Figure 5b As shown in the diagram, the arrows indicate the direction of transmission fluid flow. At this point, the temperature sensor is below the fluid level and can collect the actual temperature of the lubricating oil. When the vehicle is under harsh operating conditions, such as driving on an incline (e.g., ...), ... Figure 6a As shown in the figure, the positions of the transmission fluid level and oil temperature sensors and hydraulic components are as follows: Figure 6b As shown, the oil temperature sensor is positioned above the fluid level, preventing it from accurately reflecting the transmission fluid temperature. Even below the fluid level, the fluid flow affects the reading. Vehicle testing revealed that when a vehicle is driven in reverse on a slope with repeated starts, the clutch slippage generates significant heat, causing the fluid temperature to gradually rise to 125°C (as measured by the sensor). Upon reaching the top of the slope, normal driving reduces clutch and transmission system heat generation, but the sensor reading abruptly jumps from 125°C to 135°C. This indicates that the sensor's initial position failed to detect the highest temperature point. The temperature was only detected after the fluid reached thermal equilibrium at the top of the slope. Based on thermal equilibrium theory, the localized peak temperature of the transmission fluid is estimated to be above 135°C. When the oil pump directly draws high-temperature transmission fluid to cool components like the clutch, the difference between the actual fluid temperature and the sensor reading leads to poor clutch cooling, causing overheating and potentially resulting in failure and even burning.

[0036] This embodiment provides a method for determining the temperature of the transmission lubricating oil in the electronic devices operating in the aforementioned vehicle. Figure 2 This is a flowchart of a method for determining the temperature of transmission lubricating oil according to one embodiment of the present invention, such as... Figure 2 As shown, the process includes the following steps:

[0037] Step S21: Collect vehicle operating status information, engine operating status information, working status information of components inside the transmission, transmission housing information, radiator working status information, physical characteristics of transmission assembly components, oil temperature collected by oil temperature sensor, and ambient temperature. The oil temperature sensor is located at the end of the transmission control valve body that is immersed in lubricating oil and is used to collect the oil temperature of the lubricating oil inside the transmission.

[0038] Step S22: Determine the heat generation power of the transmission based on vehicle operating status information, engine operating status information, and working status information of components inside the transmission;

[0039] Step S23: Determine the transmission cooling power based on the transmission heat dissipation power, transmission housing information, radiator operating status information, ambient temperature, and oil temperature.

[0040] Step S24: Determine the transmission oil temperature rise based on the physical characteristics of the transmission assembly components and the transmission heat dissipation power;

[0041] Step S25: Determine the actual oil temperature of the lubricating oil based on the oil temperature and the transmission oil temperature rise.

[0042] Specifically, in step S25, the calculation model used to determine the actual oil temperature of the lubricating oil based on the oil body temperature and the transmission oil temperature rise is: t′=t+Δt, where t′ is the actual oil temperature, t is the oil body temperature, and Δt is the transmission oil temperature rise.

[0043] Through the above steps, the transmission heat generation power, transmission cooling power, and transmission oil temperature rise are calculated respectively. Based on the oil temperature and transmission oil temperature rise, the actual lubricating oil temperature is calculated. By compensating for the oil temperature using the transmission oil temperature rise, the actual temperature of the transmission lubricating oil can be accurately determined. The accuracy meets the temperature protection requirements of transmission components, thus solving the technical problem of inaccurate oil temperature detection under harsh operating conditions in related technologies. In this embodiment, the collected oil temperature is actually corrected by the transmission oil temperature rise, making the cooling lubricating oil temperature delivered to each component from the oil pump outlet more accurate. This is beneficial for protecting each component and improving the performance reliability of each component (such as the clutch).

[0044] Optionally, in step S21, the vehicle operating status information includes at least one of the following: vehicle speed, steering wheel angle, tire steering angle, brake pedal signal, brake master cylinder pressure signal, accelerator pedal opening, wheel speed difference, X-direction acceleration signal, and Y-direction acceleration signal; the engine operating status information includes at least one of the following: engine speed, combustion torque, torque loss, throttle opening, and coolant temperature.

[0045] By collecting information such as vehicle speed, steering wheel angle, tire steering angle, brake pedal signal, brake master cylinder pressure signal, accelerator pedal opening, wheel speed difference, X-direction acceleration signal, and Y-direction acceleration signal, it is possible to determine whether the vehicle is currently in a starting / climbing / steady-speed driving state, and calculate information such as vehicle acceleration, road gradient, and acceleration resistance. By collecting information such as engine speed, combustion torque, torque loss, throttle opening, and coolant temperature, the power input from the engine to the transmission can be calculated.

[0046] Optionally, in step S21, the transmission housing information includes at least the housing area; the radiator operating status information includes at least one of the following: cooler inlet water temperature, coolant flow rate, heat exchange oil flow rate; and the physical characteristics of the transmission assembly components include at least one of the following: specific heat capacity, mass.

[0047] Depending on actual needs, the physical characteristics of transmission assembly components can include even more information.

[0048] In one exemplary embodiment of this application, in step S24, the calculation model for the transmission oil temperature rise is determined as: Δt = P 散 / (C n ×m n ), where P 散 For the cooling power of the transmission, C n For the specific heat capacity of each component material, m n Let n be the mass of each component, and n be the number of components.

[0049] Optionally, in step S22, the heat generation power of the transmission is determined based on the vehicle operating status information, engine operating status information, and the operating status information of the components inside the transmission, including the following execution steps:

[0050] Step S221: Input the vehicle operating status information and engine operating status information into the first calculation model, and output the first heat generation power of the transmission;

[0051] Step S222: Input the working status information of the components inside the transmission into the second calculation model and output the second heat generation power of the transmission;

[0052] Step S223: Determine the transmission heat power based on the transmission's first heat power and transmission's second heat power.

[0053] By using steps S221-S223, the heat generation power of the transmission is calculated using two different methods, and the final heat generation power of the transmission is determined based on the calculation results of the two methods. This makes the final determined heat generation power of the transmission more accurate, and makes the subsequent transmission oil temperature rise and actual oil temperature results more precise.

[0054] Optionally, in step S221, the vehicle operating status information and engine operating status information are input into the first calculation model, and the first heat generation power of the transmission is output, including the following execution steps:

[0055] Step S2211: Input the vehicle operating status information into the first power model and output the transmission output power;

[0056] Specifically, the first power model can be: P 出 =F×U, where U is the vehicle's speed and F is the vehicle's resistance, and the vehicle resistance F = F f +F w +F i +F j F f For rolling resistance, F w For air resistance, F i For slope resistance, F j To accelerate the resistance, the calculation models for each resistance level can optionally be as follows:

[0057] F f = f × G, where f is the rolling resistance coefficient (usually obtained through testing) and G is the vehicle weight;

[0058] F w =1 / 2C D ×A×ρ×U r 2 , where C D U is the air drag coefficient, A is the frontal area, ρ is the air density, and U is the air resistance coefficient. r relative velocity

[0059] F i =G×sinα, where G is the vehicle weight (unit: mg) and sinα is the sine of the road slope;

[0060] F j =m×d u / d t Where m is the mass of the vehicle, d u / d t It is acceleration.

[0061] Step S2212: Input the engine operating status information into the second power model and output the transmission input power;

[0062] Specifically, the second power model can be: P 入 = t × n ÷ 9550, where P 入Here, t represents the transmission input power, t represents the engine net output torque (obtained by subtracting torque loss from engine combustion torque; this value is typically obtained through engine calibration tests), and n represents the engine speed. It should be understood that the transmission input power in this embodiment refers to the power input from the engine to the transmission.

[0063] Step S2213: Input the transmission output power and transmission input power into the third power model, and output the transmission first heat generation power.

[0064] Specifically, the third power model can be: P1 = P 出 -P 入 Where P1 is the first heat generation power of the transmission, P 出 P is the output power of the transmission. 入 This is the input power to the transmission.

[0065] Through steps S2211-S2213, the first calculation model includes at least multiple models such as the first power model, the second power model, and the third power model. The first heat generation power of the transmission is calculated based on the vehicle operating status information and the engine operating status information. That is, the heat generation power of the transmission is determined based on the input and output of the transmission, which provides a reference for the subsequent determination of the final heat generation power of the transmission. It can also be cross-checked with data calculated by other methods to ensure the accuracy of the final result.

[0066] Optionally, in step S222, the working status information of the components inside the transmission includes at least the working status information of the clutch, the working status information of the bearing, and the working status information of the shaft gear. The working status information of the components inside the transmission is input into the second calculation model, and the second heat generation power of the transmission is output, including the following execution steps:

[0067] Step S2221: Input the clutch working status information into the clutch heating model and output the clutch heating power;

[0068] Specifically, the clutch heating model is: P clutch =T clutch ×Δn÷9550, where T clutch The clutch transmits torque, Δn is the speed difference between the clutch input and output ends, and P clutch The clutch generates heat. It should be noted that the clutch input speed is the same as the engine speed, while the clutch output speed can be obtained from a sensor mounted on the clutch output. The clutch transmits torque T. clutch This is an internal calculation for automatic transmission control, typically obtained by calculating the clutch engagement force.

[0069] Step S2222: Input the shaft tooth working status information into the first gear heating model and output the gear meshing friction heating power;

[0070] Specifically, the heating model of the first gear is as follows: Among them, P mesh P is the power generated by frictional heating during gear meshing (unit: kW). s P is the power of heat generated by gear meshing and sliding (unit: kW). r F represents the rolling heat generation power of gear meshing (unit: kW), La represents the length of the gear meshing line (unit: mm), and F represents the rolling heat generation power of gear meshing (unit: kW). n f is the normal load on the meshing tooth surface of the gear (unit: N). s V is the transient slip friction coefficient. s F is the transient slip velocity at the gear meshing point (unit: m / s). r V represents the rolling friction load during gear meshing (unit: N). r The instantaneous rolling speed at the gear meshing point (unit: m / s).

[0071] Step S2223: Input the shaft gear working status information into the second gear heating model and output the gear oil stirring heating power;

[0072] Specifically, the heating model of the second gear is as follows: Among them, P pad ρ is the power of gear oil heating (unit: kW), and ρ is the density of gear lubricating oil (unit: kg / m³). 3 ), ω is the gear angular velocity (unit: m / s), R p S is the gear pitch circle radius (unit: m). m The area of ​​gears immersed in lubricating oil (unit: m) 2 ), C m C is the gear churning resistance torque (unit: Nm). t The gear wind resistance torque (unit: Nm).

[0073] Among them, the gear oil stirring resistance torque C m The calculation model is as follows:

[0074]

[0075] γ=ω 2 (R p bm) 1 / 3 R ec =ωR p b / v

[0076] C m D is the gear churning resistance torque; h is the gear immersion depth; pV0 is the pitch circle diameter; ω is the total volume of lubricating oil; R is the gear speed; p γ is the pitch circle radius; g is the gravitational constant; v is the kinematic viscosity of the lubricating oil; b is the tooth width; based on the prior bench test data, and using γ and R... ec The values ​​can be used to determine the coefficients K1, K2, K3, K4, K5, and K6 under the corresponding conditions, and then the corresponding C can be calculated. m value.

[0077] Step S2224: Input the bearing operating status information into the bearing heating model and output the bearing heating power;

[0078] Specifically, the bearing heating model is: P B =P Bi +P WBi , where P Bi For viscous frictional heating independent of bearing load, P WBi To calculate the frictional heat generated by bearing load, the number of each bearing is calculated according to the different transmission structures. The bearing heat generation power can be calculated by referring to the bearing manual based on the bearing load.

[0079] Step S2225: Input the clutch heating power, gear meshing friction heating power, gear oil stirring heating power, and bearing heating power into the heating calculation model, and output the second heating power of the transmission.

[0080] Specifically, the heat generation calculation model is: P2 = P clutch +P mesh +P pad +P B P2 is the second heat-generating power of the transmission.

[0081] Through steps S2221-S2225, the heat generation power of multiple components in the transmission is calculated to obtain the second heat generation power of the transmission, which provides a reference for the subsequent determination of the transmission heat generation power and is cross-checked with the results obtained by other methods to ensure the accuracy of the final result.

[0082] Optionally, in step S223, the transmission heating power is determined based on the transmission's first heating power and transmission's second heating power, including the following execution steps:

[0083] Step S2231: Collect vehicle speed information;

[0084] Step S2232: When the vehicle speed is greater than the preset vehicle speed value, determine the first heat generation power of the transmission as the heat generation power of the transmission.

[0085] Specifically, in one exemplary embodiment of this application, the preset vehicle speed is 2.5 km / h.

[0086] Step S2233: When the vehicle speed is less than the preset vehicle speed value, determine the second heat generation power of the transmission as the transmission heat generation power.

[0087] Since the first heat-generating power of the transmission is calculated based on the vehicle speed signal, at low vehicle speeds, the calculation result is significantly affected by the type of speed sensor used and the accuracy of the algorithm. Using the first heat-generating power at this time can easily lead to a large deviation in the final calculation result. Therefore, at low vehicle speeds (i.e., when the vehicle speed is less than the preset speed value), the second heat-generating power of the transmission is determined as the transmission heat-generating power. At higher vehicle speeds, different gear engagement positions are selected, placing higher demands on the controller's computing power and algorithm. Using the second heat-generating power at this time can easily lead to a large deviation. Therefore, at high vehicle speeds (i.e., when the vehicle speed is greater than the preset speed value), the first heat-generating power of the transmission is determined as the transmission heat-generating power. By using steps S2231-S2233 to select different calculation results as the transmission heat-generating power for subsequent calculations based on different vehicle speeds, the accuracy of subsequent calculations can be improved, resulting in a more precise final result.

[0088] Optionally, in step S23, the transmission cooling power is determined based on the transmission heat dissipation power, transmission housing information, radiator operating status information, ambient temperature, and oil temperature, including the following execution steps:

[0089] Step S231: Input the transmission housing information, ambient temperature and oil temperature into the first heat dissipation model, and output the transmission housing heat dissipation power;

[0090] Specifically, the first heat dissipation model is P. 壳 = K×S×ΔT1×V, where K is the heat transfer convection coefficient; S is the heat dissipation area of ​​the shell, where part of the plastic shell needs to be equivalent to the area of ​​the metal shell; ΔT1 is the difference between the oil temperature and the ambient temperature; V is the vehicle speed; P 壳 This is for heat dissipation power of the transmission housing.

[0091] Step S232: Input the radiator operating status information and oil temperature into the second heat dissipation model, and output the radiator heat dissipation power;

[0092] Specifically, the second heat dissipation model is P 散热器 = Q × C × ΔT2, where ΔT2 is the difference between the oil body temperature and the return oil temperature, C is the specific heat capacity of the transmission oil, Q is the circulating oil flow rate, and P... 散热器 This refers to the radiator's heat dissipation power. The return oil temperature can be obtained by referring to tables based on the cooler inlet water temperature (water temperature), technical coolant flow rate (the mechanical water pump is positively correlated with engine speed), transmission oil temperature, and heat exchange oil flow rate (calculated parameters of the transmission hydraulic system). These tables can be obtained from the transmission heat exchanger heat exchange performance test records.

[0093] Step S233: Input the heat dissipation power of the transmission housing, the heat dissipation power of the radiator, and the heat dissipation power of the transmission into the third heat dissipation model, and output the heat dissipation power of the transmission.

[0094] Specifically, the third heat dissipation model is: P 散 =P 发 -P 壳 -P 散热器 P 发 P is the power generated by the transmission heat. 散热器 P represents the heat dissipation power of the radiator. 壳 For the heat dissipation power of the transmission housing, P 散 This is for the cooling power of the transmission.

[0095] It should be noted that the heat generated by the transmission is partially carried away by the radiator, partially carried away by the transmission housing, and the remainder is absorbed by the various components inside the transmission, resulting in a rise in transmission oil temperature. In this embodiment, the transmission cooling power is the heat absorbed by the various components inside the transmission. Through steps S231-S233, the heat absorbed by each component inside the transmission is calculated separately. By calculating the temperature rise of the lubricating oil inside the transmission caused by the transmission cooling and correcting the oil temperature collected by the oil temperature sensor, a more accurate lubricating oil temperature can be obtained.

[0096] The lubricating oil temperature curve collected using the transmission lubricating oil temperature determination method in this embodiment is as follows: Figure 4 As shown, in Figure 4 In the figure, curve 1 represents the oil temperature curve measured by the oil temperature sensor, and curve 2 represents the actual oil temperature curve finally determined in this embodiment. It can be determined that the lubricating oil temperature determined by the method in this embodiment is closer to the actual lubricating oil temperature under harsh working conditions.

[0097] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0098] This embodiment also provides a transmission lubricating oil temperature determination device, which is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0099] Figure 3 This is a structural block diagram of a transmission lubricating oil temperature determination device according to one embodiment of the present invention, such as... Figure 3 As shown, the device includes: a data acquisition module 30, used to acquire vehicle operating status information, engine operating status information, working status information of components inside the transmission, transmission housing information, radiator working status information, physical characteristics of transmission assembly components, oil temperature acquired by an oil temperature sensor, and ambient temperature. The oil temperature sensor is located at the end of the transmission control valve body immersed in lubricating oil and is used to acquire the oil temperature of the lubricating oil inside the transmission; a first calculation module 32, used to determine the transmission heat generation power based on the vehicle operating status information, engine operating status information, and working status information of components inside the transmission; a second calculation module 34, used to determine the transmission heat dissipation power based on the transmission heat generation power, transmission housing information, radiator working status information, ambient temperature, and oil temperature; a third calculation module 36, used to determine the transmission oil temperature rise based on the physical characteristics of the transmission assembly components and the transmission heat dissipation power; and an oil temperature calculation module 38, used to determine the actual oil temperature of the lubricating oil based on the oil temperature and the transmission oil temperature rise.

[0100] The aforementioned device calculates the transmission heat generation power, transmission cooling power, and transmission oil temperature rise, respectively. Based on the oil temperature and transmission oil temperature rise, the actual lubricating oil temperature is calculated. By compensating the oil temperature with the transmission oil temperature rise, the actual temperature of the transmission lubricating oil can be accurately determined. The accuracy meets the temperature protection requirements of transmission components, thereby solving the technical problem of inaccurate oil temperature detection under harsh operating conditions.

[0101] It should be noted that the above modules can be implemented by software or hardware. For the latter, they can be implemented in the following ways, but are not limited to: all the above modules are located in the same processor; or, the above modules are located in different processors in any combination.

[0102] Embodiments of the present invention also provide a storage medium storing a computer program, wherein the computer program is configured to execute the steps in any of the above method embodiments when running.

[0103] Optionally, in this embodiment, the storage medium may be configured to store a computer program for performing the following steps:

[0104] Step S1: Collect vehicle operating status information, engine operating status information, working status information of components inside the transmission, transmission housing information, radiator working status information, physical characteristics of transmission assembly components, oil temperature collected by oil temperature sensor, and ambient temperature. The oil temperature sensor is located at the end of the transmission control valve body that is immersed in lubricating oil and is used to collect the oil temperature of the lubricating oil inside the transmission.

[0105] Step S2: Determine the heat generation power of the transmission based on vehicle operating status information, engine operating status information, and working status information of components inside the transmission;

[0106] Step S3: Determine the transmission cooling power based on the transmission heat dissipation power, transmission housing information, radiator operating status information, ambient temperature, and oil temperature.

[0107] Step S4: Determine the transmission oil temperature rise based on the physical characteristics of the transmission assembly components and the transmission heat dissipation power;

[0108] Step S5: Determine the actual oil temperature of the lubricating oil based on the oil body temperature and the transmission oil temperature rise.

[0109] Optionally, in this embodiment, the storage medium may include, but is not limited to, various media capable of storing computer programs, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0110] Embodiments of the present invention also provide a processor configured to run a computer program to perform the steps in any of the above method embodiments.

[0111] Optionally, in this embodiment, the processor can be configured to perform the following steps via a computer program:

[0112] Step S1: Collect vehicle operating status information, engine operating status information, working status information of components inside the transmission, transmission housing information, radiator working status information, physical characteristics of transmission assembly components, oil temperature collected by oil temperature sensor, and ambient temperature. The oil temperature sensor is located at the end of the transmission control valve body that is immersed in lubricating oil and is used to collect the oil temperature of the lubricating oil inside the transmission.

[0113] Step S2: Determine the heat generation power of the transmission based on vehicle operating status information, engine operating status information, and working status information of components inside the transmission;

[0114] Step S3: Determine the transmission cooling power based on the transmission heat dissipation power, transmission housing information, radiator operating status information, ambient temperature, and oil temperature.

[0115] Step S4: Determine the transmission oil temperature rise based on the physical characteristics of the transmission assembly components and the transmission's heat dissipation power;

[0116] Step S5: Determine the actual oil temperature of the lubricating oil based on the oil body temperature and the transmission oil temperature rise.

[0117] An embodiment of the present invention also provides a vehicle, the vehicle including a transmission, wherein the temperature of the transmission lubricating oil is determined using the above-described method for determining the temperature of the transmission lubricating oil.

[0118] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated here.

[0119] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0120] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0121] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0122] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0123] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0124] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0125] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for determining the temperature of transmission lubricating oil, characterized in that, The method includes the following steps: The system collects vehicle operating status information, engine operating status information, working status information of components inside the transmission, transmission housing information, radiator working status information, physical characteristics of transmission assembly components, oil temperature collected by an oil temperature sensor, and ambient temperature. The oil temperature sensor is located at the end of the transmission control valve body that is immersed in lubricating oil and is used to collect the oil temperature of the lubricating oil inside the transmission. Based on the vehicle operating status information, the engine operating status information, and the working status information of the components inside the transmission, the heat generation power of the transmission is determined. The transmission cooling power is determined based on the transmission heat dissipation power, the transmission housing information, the radiator operating status information, the ambient temperature, and the oil temperature. The transmission oil temperature rise is determined based on the physical characteristics of the transmission assembly components and the transmission's heat dissipation power. The actual temperature of the lubricating oil is determined based on the oil temperature and the transmission oil temperature rise. Based on the vehicle operating status information, the engine operating status information, and the working status information of the components inside the transmission, the heat dissipation power of the transmission is determined, including the following steps: The vehicle operating status information and the engine operating status information are input into the first calculation model, and the first heat generation power of the transmission is output. The working status information of the components inside the transmission is input into the second calculation model, and the second heat generation power of the transmission is output. The transmission heating power is determined based on the first heating power and the second heating power of the transmission. Determining the transmission's heat output power based on the transmission's first heat output power and the transmission's second heat output power includes: Collect vehicle speed information; When the vehicle speed is greater than a preset vehicle speed value, the first heat-generating power of the transmission is determined to be the heat-generating power of the transmission; When the vehicle speed is less than the preset vehicle speed value, the second heat generation power of the transmission is determined to be the heat generation power of the transmission.

2. The method according to claim 1, characterized in that, The vehicle operating status information and the engine operating status information are input into the first calculation model, and the first heat generation power of the transmission is output, including: The vehicle operating status information is input into the first power model, and the transmission output power is output. The engine operating status information is input into the second power model, and the transmission input power is output. The transmission output power and the transmission input power are input into the third power model to output the transmission first heat generation power.

3. The method according to claim 1, characterized in that, Based on the transmission's heat dissipation power, the transmission housing information, the radiator's operating status information, the ambient temperature, and the oil temperature, the transmission's heat dissipation power is determined, including: The transmission housing information, the ambient temperature, and the oil temperature are input into the first heat dissipation model, and the heat dissipation power of the transmission housing is output. Input the radiator's operating status information and the oil temperature into the second heat dissipation model, and output the radiator's heat dissipation power. The heat dissipation power of the transmission housing, the heat dissipation power of the radiator, and the heat generation power of the transmission are input into the third heat dissipation model, and the heat dissipation power of the transmission is output.

4. The method according to claim 1, characterized in that, The operating status information of the components within the transmission includes at least clutch operating status information, bearing operating status information, and shaft gear operating status information. The operating status information of the components within the transmission is input into the second calculation model, and the second heat generation power of the transmission is output, including: The clutch operating status information is input into the clutch heating model, and the clutch heating power is output. The working state information of the shaft teeth is input into the first gear heating model, and the gear meshing friction heating power is output. The working status information of the shaft teeth is input into the second gear heating model, and the gear oil stirring heating power is output. Input the bearing operating status information into the bearing heating model and output the bearing heating power; The heating power of the clutch, the heating power of the gear meshing friction, the heating power of the gear oil stirring, and the heating power of the bearing are input into the heating calculation model, and the second heating power of the transmission is output.

5. The method according to claim 1 or 2, characterized in that, The vehicle operating status information includes at least one of the following: vehicle speed, steering wheel angle, tire steering angle, brake pedal signal, brake master cylinder pressure signal, accelerator pedal opening, wheel speed difference, X-direction acceleration signal, and Y-direction acceleration signal. The engine operating status information includes at least one of the following: engine speed, combustion torque, torque loss, throttle opening, and coolant temperature.

6. The method according to claim 1 or 3, characterized in that, The transmission housing information includes at least the housing area; The radiator operating status information includes at least one of the following: radiator inlet water temperature, cooling water flow rate, and heat exchange oil flow rate; The physical properties of the transmission assembly components include at least one of the following: specific heat capacity and mass.

7. A device for determining the temperature of transmission lubricating oil, characterized in that, The apparatus is used to perform the method according to any one of claims 1-6, comprising: The acquisition module is used to acquire vehicle operating status information, engine operating status information, working status information of components inside the transmission, transmission housing information, radiator working status information, physical characteristics of transmission assembly components, oil temperature acquired by the oil temperature sensor, and ambient temperature. The oil temperature sensor is located at the end of the control valve body of the transmission that is immersed in lubricating oil, and the oil temperature sensor is used to acquire the oil temperature of the lubricating oil inside the transmission. The first calculation module is used to determine the heat generation power of the transmission based on the vehicle operating status information, the engine operating status information, and the working status information of the components inside the transmission. The second calculation module is used to determine the transmission cooling power based on the transmission heat dissipation power, the transmission housing information, the radiator operating status information, the ambient temperature, and the oil temperature. The third calculation module is used to determine the transmission oil temperature rise based on the physical characteristics of the transmission assembly components and the transmission heat dissipation power. An oil temperature calculation module is used to determine the actual oil temperature of the lubricating oil based on the oil temperature and the transmission oil temperature rise.

8. A vehicle, comprising a transmission, characterized in that, The temperature of the transmission lubricating oil is determined using the method for determining the temperature of transmission lubricating oil as described in any one of claims 1-6.

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