CN115899228A - Transmission lubricating oil temperature determination method and determination device and vehicle - Google Patents
Transmission lubricating oil temperature determination method and determination device and vehicle Download PDFInfo
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Abstract
The invention discloses a method and a device for determining the temperature of transmission lubricating oil and a vehicle. The method comprises the following steps: collecting vehicle running state information, engine running state information, working state information of components in the transmission, transmission shell information, radiator working state information, physical characteristics of transmission assembly parts, and oil body temperature and ambient temperature collected by an oil temperature sensor; determining the heating power of the transmission based on the vehicle running state information, the engine running state information and the working state information of components in the transmission; determining the heat dissipation power of the transmission based on the heat dissipation power of the transmission, the information of a transmission shell, the information of the working state of a radiator, the ambient temperature and the temperature of an oil body; determining the temperature rise of the transmission oil based on the physical characteristics of the transmission assembly parts and the transmission heat dissipation power; and determining the actual oil temperature of the lubricating oil based on the oil body temperature and the temperature rise of the transmission oil. The invention solves the problem of inaccurate oil temperature detection under the harsh working conditions of the related technology.
Description
Technical Field
The invention relates to the technical field of vehicle transmission oil temperature detection, in particular to a transmission lubricating oil temperature determination method, a determination device and a vehicle.
Background
The existing automatic transmissions are all provided with an oil temperature sensor for monitoring the temperature of lubricating oil in real time, and an automatic transmission control unit monitors the working states of all gear shifting elements and clutch elements in real time according to the collected temperature of the lubricating oil and carries out corresponding protection according to the temperature of the lubricating oil, such as clutch friction plate temperature protection, gear shifting element protection, hybrid transmission motor cooling protection and the like.
The existing oil temperature sensor has two arrangement forms:
the first scheme is that the sensor is arranged at a part of the control valve body, which is immersed in lubricating oil, an oil temperature sensor is installed, the sensor is arranged at normal pressure, the sensor is integrated on the valve body in the scheme, the arrangement is simple, the wiring harness is reliably connected, signals are acquired at normal pressure, the cost is low, and the following defects are realized: 1. fixed point temperature collection, namely collecting the temperature of a point near a sensor, is more suitable for steady-state working conditions and monitoring the balance temperature of lubricating oil; 2. local temperature overshoot cannot be ascertained; 3. the instantaneous temperature is not easily monitored.
The second scheme is that the sensor is arranged inside a hydraulic oil pump outlet pipeline, a high-pressure oil temperature sensor is arranged, monitoring signals of the scheme are reliable, temperature information collected by the oil temperature sensor is more accurate in transmission element protection, but the requirements of high pressure, sealing, signal line arrangement and the like are met due to the arrangement environment of the oil temperature sensor, the cost is high, the arrangement is difficult, the manufacturability is poor, leakage failure is easy to occur, and faults are brought to a hydraulic system.
In summary, in the prior art, how to solve the problem of clutch over-temperature reliability under severe operating conditions for an automatic transmission becomes a current key problem. In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a method and a device for determining the temperature of transmission lubricating oil and a vehicle, which at least solve the technical problem of inaccurate oil temperature detection under severe working conditions of related technologies.
According to an aspect of an embodiment of the present invention, there is provided a method of determining a temperature of transmission oil, characterized in that the method comprises the steps of: the method comprises the following steps of collecting vehicle running state information, engine running state information, working state information of components in the transmission, transmission shell information, radiator working state information, physical characteristics of transmission assembly parts, and oil body temperature and environmental temperature collected by an oil temperature sensor, wherein the oil temperature sensor is arranged at one end, immersed in lubricating oil, of a control valve body of the transmission, and is used for collecting the oil body temperature of the lubricating oil in the transmission; determining the heating power of the transmission based on the vehicle running state information, the engine running state information and the working state information of components in the transmission; determining the heat dissipation power of the transmission based on the heat dissipation power of the transmission, the information of a transmission shell, the information of the working state of a radiator, the ambient temperature and the temperature of an oil body; determining the temperature rise of the transmission oil based on the physical characteristics of the transmission assembly parts and the transmission heat dissipation power; and determining the actual oil temperature of the lubricating oil based on the oil body temperature and the transmission oil temperature rise.
Optionally, determining the heating power of the transmission based on the vehicle operating state information, the engine operating state information, and the operating state information of the components in the transmission, includes the following steps: inputting the vehicle running state information and the engine running state information into a first calculation model, and outputting a first heat generation power of a transmission; inputting the working state information of the components in the transmission into a second calculation model, and outputting second heating power of the transmission; the transmission heating power is determined based on the transmission first heating power and the transmission second heating power.
Optionally, determining the transmission heating power based on the transmission first heating power and the transmission second heating power comprises: collecting vehicle speed information; determining a first heating power of the transmission as a transmission heating power under the condition that the vehicle speed is greater than a preset vehicle speed value; and under the condition that the vehicle speed is less than the preset vehicle speed value, determining the second heating power of the transmission as the heating power of the transmission.
Optionally, inputting the vehicle operating state information and the engine operating state information into a first calculation model, and outputting a first transmission heating power, comprising: inputting the vehicle running state information into a first power model and outputting the output power of the transmission; inputting the engine running state information into a second power model and outputting the input power of the transmission; and inputting the transmission output power and the transmission input power into a third power model, and outputting a first transmission heating power.
Optionally, determining the transmission heat dissipation power based on the transmission heat dissipation power, the transmission case information, the radiator operating state information, the ambient temperature, and the oil body temperature includes: inputting the information of the transmission shell, the ambient temperature and the oil body temperature into a first heat dissipation model, and outputting the heat dissipation power of the transmission shell; inputting the working state information of the radiator and the temperature of the oil body into a second heat dissipation model, and outputting the heat dissipation power of the radiator; and inputting the heat dissipation power of the shell of the transmission, the heat dissipation power of the radiator and the heat dissipation power of the transmission into a third heat dissipation model, and outputting the heat dissipation power of the transmission.
Optionally, the step of inputting the operating state information of the internal component of the transmission into the second calculation model and outputting the second heating power of the transmission includes: inputting the working state information of the clutch into a clutch heating model, and outputting the heating power of the clutch; inputting the working state information of the shaft teeth into a first gear heating model, and outputting gear meshing friction heating power; inputting the working state information of the shaft teeth into a second gear heating model, and outputting gear oil stirring heating power; inputting the working state information of the bearing into a bearing heating model, and outputting the bearing heating power; and inputting the heating power of the clutch, the gear engagement friction heating power, the gear oil stirring heating power and the bearing heating power into a heating calculation model, and outputting a second heating power of the transmission.
Optionally, the vehicle operating state information includes at least one of: the device comprises a vehicle running speed, a steering wheel steering angle, a tire steering angle, a brake pedal signal, a brake master cylinder pressure signal, an accelerator pedal opening, a rotating speed difference of each wheel, an X-direction acceleration signal and a Y-direction acceleration signal; the engine operating state information includes at least one of: engine speed, combustion torque, torque loss, throttle opening, and cooling water temperature.
Optionally, the transmission housing information includes at least a housing area; the radiator working state information at least comprises one of the following information: the water inlet temperature of the cooler, the cooling water flow and the heat exchange oil flow; physical characteristics of the transmission assembly components include at least one of: specific heat capacity, mass.
According to still another aspect of an embodiment of the present invention, there is also provided a temperature determining apparatus for transmission lubricating oil, including: the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring vehicle running state information, engine running state information, working state information of components in the transmission, transmission shell information, radiator working state information, physical characteristics of transmission assembly parts, and oil body temperature and environmental temperature acquired by an oil temperature sensor; the first calculation module is used for determining the heating power of the transmission based on the vehicle running state information, the engine running state information and the working state information of components in the transmission; the second calculation module is used for determining the heat dissipation power of the transmission based on the heat dissipation power of the transmission, the information of the shell of the transmission, the information of the working state of a radiator, the ambient temperature and the temperature of oil bodies; the third calculation module is used for determining the temperature rise of the transmission oil based on the physical characteristics of the transmission assembly parts and the transmission heat dissipation power; and the oil temperature calculation module is used for determining the actual oil temperature of the lubricating oil based on the oil body temperature and the temperature rise of the transmission oil.
According to still another aspect of the embodiment of the invention, there is also provided a vehicle including a transmission, and the temperature of the lubricating oil of the transmission is determined by the above-described temperature determination method of the transmission lubricating oil.
In the embodiment of the invention, the heating power of the transmission, the heat dissipation power of the transmission and the oil temperature rise of the transmission are respectively calculated, the actual oil temperature of the lubricating oil is calculated based on the oil body temperature and the oil temperature rise of the transmission, the actual temperature of the lubricating oil of the transmission can be accurately determined by compensating the oil body temperature by the oil temperature rise of the transmission, the temperature protection requirement of components of the transmission can be accurately met, and the technical problem of inaccurate oil temperature detection in the harsh working conditions of the related technology is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and do not constitute a limitation of the invention. In the drawings:
fig. 1 is a hardware configuration block diagram of an electronic device of a vehicle according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method of determining a temperature of transmission oil according to one embodiment of the present invention;
FIG. 3 is a block diagram of a transmission oil temperature determining apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of a transmission lubricant temperature profile according to an alternate embodiment of the present invention;
FIGS. 5a and 5b are schematic diagrams of the position of an oil temperature sensor with the vehicle in a horizontal state;
fig. 6a and 6b are schematic diagrams of the position of an oil temperature sensor with a vehicle in a harsh operating condition.
Wherein the figures include the following reference numerals:
1. transmission oil level; 2. a transmission housing; 3. an oil temperature sensor; 4. an oil pump; 5. a control valve body; 6. a clutch.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In accordance with one embodiment of the present invention, there is provided an embodiment of a method for determining the temperature of transmission oil, it being noted that the steps illustrated in the flowchart of the drawings may be performed in a computer system such as a set of computer executable instructions and that, although a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than presented herein.
The method embodiments may be implemented in an electronic device or similar computing device that includes a memory and a processor in a vehicle. Taking the example of an electronic device operating on a vehicle, as shown in fig. 1, the electronic device of the vehicle may include one or more processors 102 (the 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 electronic device of the vehicle may further include a transmission device 106 for communication function, an input-output device 108, and a display 110. It will be understood by those skilled in the art that the structure shown in fig. 1 is merely an illustration and is not intended to limit the structure of the electronic device of the vehicle. For example, the electronic device of the vehicle may also include more or fewer components than described above, or have a different configuration than described above.
The memory 104 can be used for storing computer programs, for example, software programs and modules of application software, such as computer programs corresponding to the information processing method in the embodiment of the present invention, and the processor 102 executes various functional applications and data processing by running the computer programs stored in the memory 104, that is, implementing the information processing method described above. 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 examples, the memory 104 may further include memory located remotely from the processor 102, which may be connected to the mobile terminal over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The transmission device 106 is used to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a Network adapter (NIC) that can be connected to other Network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is used to communicate with the internet in a wireless manner.
The display 110 may be, for example, a touch screen type Liquid Crystal Display (LCD). The liquid crystal display may enable a user to interact with a user interface of the mobile terminal. In some embodiments, the mobile terminal has a Graphical User Interface (GUI) with which a user can interact by touching finger contacts and/or gestures on a touch-sensitive surface, where the human interaction functionality optionally includes the following interactions: creating web pages, drawing, word processing, making electronic documents, games, video conferencing, instant messaging, emailing, call interfacing, playing digital video, playing digital music, and/or web browsing, etc., executable instructions for performing the above-described human-computer interaction functions are configured/stored in one or more processor-executable computer program products or readable storage media.
For the purpose of describing the technical problems to be solved in the present embodiment, the following description will be made on the method for detecting the oil temperature of the vehicle transmission in the prior art: when the vehicle is in a horizontal state (as shown in fig. 5 a), the positions of the transmission liquid level, the oil temperature sensor and the hydraulic component are shown in fig. 5b, an arrow in the diagram is the flowing direction of transmission oil, and at the moment, the temperature sensor is below the liquid level and can acquire the actual temperature of the lubricating oil; when the vehicle is in a severe working condition such as running on a slope (as shown in fig. 6 a), the positions of the liquid level, the oil temperature sensor and the hydraulic components of the transmission are shown in fig. 6b, the oil temperature sensor is higher than the liquid level, so that the oil temperature sensor cannot truly reflect the oil temperature of the transmission, and even under the liquid level, the oil temperature of the transmission cannot truly reflect due to the influence of the flowing oil. According to the vehicle test result, the vehicle runs in a reverse gear on a slope and starts repeatedly, at the moment, the sliding friction heat productivity of the clutch is large, and the oil temperature is gradually increased to 125 ℃ (collected by an oil temperature sensor); after the vehicle runs to the top of a slope, the heating value of a clutch in normal running is reduced, the heating value of a transmission system is also reduced, but the value of an oil temperature sensor has a sudden change, the temperature of 125 ℃ is rapidly increased to 135 ℃, the position of the oil temperature sensor is shown, the highest position of the oil temperature cannot be detected, and the oil is detected by the oil temperature sensor after the oil is fully stirred and thermally balanced when the vehicle runs on a flat road at the top of the slope. The local maximum transmission oil temperature is higher than 135 ℃ according to the thermal equilibrium theory. When the high derailleur oil of oil pump direct absorption temperature, go to components and parts such as cooling clutch again, because of the temperature difference that actual oil temperature and temperature sensor gathered, can cause the actual cooling effect variation of clutch, appear that the clutch is overheated, risk such as inefficacy and ablation can appear in the serious time.
In the present embodiment, a method for determining the temperature of the transmission lubricating oil of the electronic device operating in the vehicle is provided, and fig. 2 is a flowchart of a method for determining the temperature of the transmission lubricating oil according to one embodiment of the present invention, as shown in fig. 2, the flowchart includes the following steps:
s21, collecting vehicle running state information, engine running state information, working state information of components in the transmission, transmission shell information, radiator working state information, physical characteristics of transmission assembly parts, and oil body temperature and environmental temperature collected by an oil temperature sensor, wherein the oil temperature sensor is arranged at one end, immersed in lubricating oil, of a control valve body of the transmission, and is used for collecting the oil body temperature of the lubricating oil in the transmission;
step S22, determining the heating power of the transmission based on the vehicle running state information, the engine running state information and the working state information of components in the transmission;
step S23, determining the heat dissipation power of the transmission based on the heat dissipation power of the transmission, the information of the shell of the transmission, the working state information of a radiator, the ambient temperature and the temperature of oil;
step S24, determining the temperature rise of the transmission oil based on the physical characteristics of the transmission assembly parts and the transmission heat dissipation power;
and S25, determining the actual oil temperature of the lubricating oil based on the oil body temperature and the temperature rise of the transmission oil.
Specifically, in step S25, based on the oil body temperature and the transmission oil temperature rise, the calculation model used to determine the actual oil temperature of the lubricating oil is: t '= t + Δ t, where t' is the actual oil temperature, t is the oil body temperature, and Δ t is the transmission oil temperature rise.
Through the steps, the heating power of the transmission, the heat dissipation power of the transmission and the oil temperature rise of the transmission are respectively calculated, the actual oil temperature of the lubricating oil is calculated based on the oil body temperature and the oil temperature rise of the transmission, the actual temperature of the lubricating oil of the transmission can be accurately determined by compensating the oil body temperature through the oil temperature rise of the transmission, the precision meets the temperature protection requirement of components of the transmission, and the technical problem that the oil temperature detection is inaccurate under the severe working condition of the related technology is solved. In this embodiment, the temperature of the collected oil body is actually corrected through the temperature rise of the transmission oil, so that the temperature of the cooling lubricating oil for each component at the outlet of the oil pump is more accurate, the protection of each component is facilitated, and the performance reliability of each component (such as a clutch) is improved.
Optionally, in step S21, the vehicle operation state information includes at least one of: the device comprises a vehicle running speed, a steering wheel steering angle, a tire steering angle, a brake pedal signal, a brake master cylinder pressure signal, an accelerator pedal opening, a rotating speed difference of each wheel, an X-direction acceleration signal and a Y-direction acceleration signal; the engine operating state information includes at least one of: engine speed, combustion torque, torque loss, throttle opening, and cooling water temperature.
By collecting information such as vehicle running speed, steering wheel steering angle, tire steering angle, brake pedal signal, brake master cylinder pressure signal, accelerator pedal opening, difference of rotation speed of each wheel, acceleration signal in X direction and acceleration signal in Y direction, it can be determined which state the vehicle is currently in starting/climbing/steady running, and information such as acceleration, road gradient and acceleration resistance of the vehicle can be calculated. By collecting information such as the rotating speed of the engine, the combustion torque, the torque loss, the opening degree of a throttle valve, the temperature of cooling water and the like, the power input to the transmission end of the engine can be calculated.
Alternatively, in step S21, the transmission case information includes at least a case area; the radiator working state information at least comprises one of the following information: the water inlet temperature of the cooler, the cooling water flow and the heat exchange oil flow; physical characteristics of the transmission assembly components include at least one of: specific heat capacity, mass.
The physical characteristics of the transmission assembly components may also include further details depending on the actual requirements.
In an exemplary embodiment of the present application, in step S24, a calculation model for determining the transmission oil temperature rise is: Δ t = P Powder medicine /(C n ×m n ) Wherein P is Powder medicine For dissipating heat power of the transmission, C n Specific heat capacity of each component material, m n N is the mass of each part and the number of parts.
Optionally, in step S22, determining the transmission heating power based on the vehicle operating state information, the engine operating state information, and the operating state information of the components in the transmission, includes the following steps:
step S221, inputting the vehicle running state information and the engine running state information into a first calculation model, and outputting a first heating power of the transmission;
step S222, inputting the working state information of the components in the transmission into a second calculation model, and outputting a second heating power of the transmission;
and step S223, determining the heating power of the transmission based on the first heating power of the transmission and the second heating power of the transmission.
Through the steps S221 to S223, the heating power of the transmission is respectively calculated in two modes, and the final heating power of the transmission is determined based on the calculation results of the two modes, so that the finally determined heating power of the transmission is more accurate, and the subsequent oil temperature rise and actual oil temperature results of the transmission are more accurate.
Alternatively, in step S221, inputting the vehicle operating state information and the engine operating state information into a first calculation model, and outputting a transmission first heating power, comprising performing the steps of:
step S2211, inputting the vehicle running state information into a first power model, and outputting the output power of the transmission;
in particular, the first power model mayComprises the following steps: p Go out = F × U, where U is the running speed of the vehicle, F is the vehicle resistance, and the vehicle resistance F = F f +F w +F i +F j ，F f To rolling resistance, F w As air resistance, F i As slope resistance, F j To accelerate the resistance, optionally, the calculation model for each resistance is as follows:
F f = f × G, where f is a rolling resistance coefficient (generally obtained through an experiment), and G is a vehicle weight;
F w ＝1/2C D ×A×ρ×U r 2 wherein, C D Is the air resistance coefficient, A is the windward area, rho is the air density, U r Is the relative velocity
F i = gxsin α, where G is the vehicle weight (unit: mg) and sin α is the sine of the road slope;
F j ＝m×d u /d t where m is the mass of the vehicle, d u /d t Is the acceleration.
Step S2212, inputting the engine running state information into a second power model, and outputting the transmission input power;
specifically, the second power model may be: p Into = t × n ÷ 9550, where P Into For transmission input power, t is engine net output torque (which can be obtained by subtracting torque loss from engine combustion torque, a value typically found by engine calibration tests), and n is 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.
And step S2213, inputting the output power and the input power of the transmission into the third power model, and outputting the first heating power of the transmission.
Specifically, the third power model may be: p 1 ＝P Go out -P Into Wherein, P 1 For a first heat-generating power, P, of the transmission Go out To output power of the transmission, P Into To input power to the transmission.
Through steps S2211 to S2213, the first calculation model at least includes a plurality of models such as a first power model, a second power model, a third power model, and the like, and the first heating power of the transmission is calculated and obtained according to the vehicle operating state information and the engine operating state information, that is, the heating power of the transmission is determined according to the input and the output of the transmission, a reference is provided for subsequently determining the final heating power of the transmission, and the calculation model can be mutually verified with data calculated in other manners, so that the precision of the final result is ensured.
Optionally, in step S222, the operating state information of the components in the transmission at least includes clutch operating state information, bearing operating state information, and shaft tooth operating state information, and the operating state information of the components in the transmission is input into the second calculation model, and a second heating power of the transmission is output, including the following steps:
step S2221, inputting the working state information of the clutch into a clutch heating model, and outputting the heating power of the clutch;
specifically, the clutch heating model is: p clutch ＝T clutch X Δ n ÷ 9550, where T clutch For torque transfer of the clutch, Δ n is the difference in speed between the input and output of the clutch, P clutch For the heating power of the clutch, it should be noted that the rotating speed of the input end of the clutch is the rotating speed of the engine, the rotating speed of the output end of the clutch can be acquired by a sensor assembled at the output end of the clutch, and the transmission torque T of the clutch clutch For controlling internal calculations of an automatic transmission, it is common to calculate the clutch engagement force.
Step S2222, inputting the working state information of the shaft teeth into a first gear heating model, and outputting the gear meshing friction heating power;
specifically, the first gear heating model is:
wherein, P mesh The gear mesh friction heating power (unit: kW), P s The gear meshing sliding heating power (unit: kW), P r The heating power (unit: kW) for gear meshing rolling, and La is the length of a gear meshing lineDegree (unit: mm), F n Is the normal load (unit: N) of the tooth surface of the gear meshing s Is the transient slip coefficient of friction, V s Is the instantaneous slip speed (unit: m/s) of the gear mesh point F r For gear mesh rolling friction load (unit: N), V r Is the instantaneous rolling speed (unit: m/s) of the gear mesh point.
Step S2223, inputting the working state information of the shaft teeth into a second gear heating model, and outputting the gear oil stirring heating power;
specifically, the second gear heating model is:
wherein, P pad Heating power (unit: kW) for gear oil stirring, and rho is gear lubricating oil density (unit: kg/m) 3 ) And ω is a gear angular velocity (unit: m/s), R p Is the gear pitch circle radius (unit: m), S m Is the area (unit: m) of the gear immersed in the lubricating oil 2 )，C m Is the gear oil stirring resistance moment (unit: nm), C t Is the wind resistance torque (unit: nm) of the gear.
Wherein, the gear oil stirring resistance moment C m The calculation model of (2) is as follows:
γ＝ω 2 (R p bm) 1/3 R ec ＝ωR p b/v
C m the moment is the oil stirring resistance of the gear; h is the oil immersion depth of the gear; d p Is the pitch circle diameter; v 0 Is the total volume of the lubricating oil; omega is the gear speed; r p Is the pitch circle radius; g is a gravity constant; v is the kinematic viscosity of the lubricating oil; b is the tooth width; based on gamma and R according to the previous bench test data ec The coefficient K under the corresponding condition can be determined by the value 1 、K 2 、K 3 、K 3 、K 4 、K 5 、K 6 Then the corresponding C can be calculated m The value is obtained.
Step S2224, inputting the working state information of the bearing into a bearing heating model, and outputting the output shaft to generate heating power;
specifically, the bearing heating model is as follows: p B ＝P Bi +P WBi Wherein P is Bi For viscous friction heating independent of bearing load, P WBi The bearing heating power can be calculated by calculating the number of each bearing according to different structures of the speed changer and checking a bearing manual according to the bearing load.
And step S2225, inputting the clutch heating power, the gear meshing friction heating power, the gear oil stirring heating power and the bearing heating power into the heating calculation model, and outputting a second heating power of the transmission.
Specifically, the heat generation calculation model is: p is 2 ＝P clutch +P mesh +P pad +P B ，P 2 A second heating power for the transmission.
Through the steps S2221 to S2225, the second heating power of the transmission is obtained by calculating the heating power of a plurality of components in the transmission, reference is provided for subsequently determining the heating power of the transmission, and the second heating power is mutually verified with the results obtained by calculation in other modes, so that the precision of the final result is ensured.
Optionally, in step S223, determining a transmission heat power based on the transmission first heat power and the transmission second heat power, comprising performing the steps of:
step S2231, collecting vehicle speed information;
step S2232, determining the first heating power of the transmission as the heating power of the transmission when the vehicle speed is greater than a preset vehicle speed value;
specifically, in one exemplary embodiment of the present application, the preset vehicle speed value is 2.5km/h.
And step S2233, determining the second heating power of the transmission as the heating power of the transmission when the vehicle speed is less than the preset vehicle speed value.
The first heating power of the transmission is calculated based on a vehicle speed signal, when the vehicle speed is low, the calculation result of the first heating power of the transmission is greatly influenced due to the type of a rotating speed sensor used by the vehicle and the accuracy of an algorithm, and at the moment, the calculation by adopting the first heating power of the transmission is easy to cause the final calculation result to have larger deviation, so that when the vehicle speed is low (namely, the vehicle speed is less than a preset vehicle speed value), the second heating power of the transmission is determined to be the heating power of the transmission; when the vehicle speed is high, the meshing gears of different gears are selected, so that the requirements on the calculation capacity and the algorithm of the controller are high, and the second heating power of the transmission is selected to easily generate large deviation, so that the first heating power of the transmission is determined to be the heating power of the transmission at the time of high vehicle speed (namely the vehicle speed is greater than a preset vehicle speed value). Through the steps S2231 to S2233, different calculation results are selected as the heating power of the transmission for subsequent calculation according to different vehicle speeds, so that the accuracy of the subsequent calculation can be improved, and the final result is more accurate.
Alternatively, in step S23, determining the transmission heat dissipation power based on the transmission heat generation power, the transmission case information, the radiator operating state information, the ambient temperature, and the oil body temperature, comprises performing the steps of:
step S231, inputting the information of the transmission shell, the ambient temperature and the oil body temperature into a first heat dissipation model, and outputting the heat dissipation power of the transmission shell;
specifically, the first heat dissipation model is P Shell ＝K×S×ΔT 1 X V, wherein K is a heat exchange convection coefficient; s is the heat dissipation area of the shell, wherein part of the plastic shell needs to be equivalent to the area of the metal shell; delta T 1 Is the difference between the oil body temperature and the ambient temperature, V is the vehicle speed, P Shell Dissipating heat power for the transmission case.
Step S232, inputting the working state information of the radiator and the temperature of the oil body into a second heat dissipation model, and outputting the heat dissipation power of the radiator;
specifically, the second heat dissipation model is P Heat radiator ＝Q×C×ΔT 2 ，ΔT 2 Is the difference between the oil body temperature and the oil return temperature, C is the specific heat capacity of the transmission oil, Q is the circulation oil flow, P Heat radiator Dissipating heat power for the heat sink. Wherein the oil return temperature can be cooled according to the water inlet temperature (water temperature) and the technology of the coolerThe water flow (positive correlation between the mechanical water pump and the engine rotating speed), the transmission oil temperature and the heat exchange oil flow (calculation parameters of a transmission hydraulic system) are obtained by looking up a table, and the table can be obtained by recording heat exchange performance tests of a transmission heat exchanger.
And step S233, inputting the heat dissipation power of the transmission shell, the heat dissipation power of the radiator and the heat dissipation power of the transmission into the third heat dissipation model, and outputting the heat dissipation power of the transmission.
Specifically, the third heat dissipation model is: p Powder medicine ＝P Hair-like device -P Shell -P Heat radiator ，P Hair-like device For generating heat power for the transmission, P Heat radiator For heat dissipation power of heat sink, P Shell For dissipating heat power from the gearbox housing, P Powder medicine Dissipating heat power for the transmission.
It should be noted that, part of the heat generated by the transmission is taken away by the radiator, part of the heat is taken away by the heat dissipation of the transmission housing, and the rest of the heat is absorbed by each component in the transmission and generates the temperature rise of the transmission oil, the transmission heat dissipation power in this embodiment is the heat absorbed by each component in the transmission, through steps S231 to S233, the heat absorbed by each component in the transmission is calculated separately, and through calculating the temperature rise of the lubricating oil in the transmission caused by the heat dissipation of the transmission and correcting the oil body temperature collected by the oil temperature sensor, a more accurate lubricating oil temperature can be obtained.
The temperature curve of the lubricating oil acquired by applying the temperature determination method for the transmission lubricating oil in the embodiment is shown in fig. 4, a curve 1 represents an oil body temperature curve measured by an oil temperature sensor, and a curve 2 represents an actual oil temperature curve finally determined in the embodiment, and it can be determined that the temperature of the lubricating oil determined by the method in the embodiment is closer to the actual temperature of the lubricating oil under a severe working condition.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
In this embodiment, a temperature determination device for transmission lubricating oil is also provided, which is used to implement the above embodiments and preferred embodiments, and which has already been described and will not be described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 3 is a block diagram showing a configuration of a transmission lubricating oil temperature determining apparatus according to an embodiment of the present invention, as shown in fig. 3, comprising: the system comprises an acquisition module 30, wherein the acquisition module 30 is used for acquiring vehicle running state information, engine running state information, working state information of components in the transmission, transmission shell information, radiator working state information, physical characteristics of transmission assembly parts, and oil body temperature and ambient temperature acquired by an oil temperature sensor, wherein the oil temperature sensor is arranged at one end, immersed in lubricating oil, of a control valve body of the transmission, and is used for acquiring the oil body temperature of the lubricating oil in the transmission; the first calculation module 32, the first calculation module 32 is used for determining the heating power of the transmission based on the vehicle running state information, the engine running state information and the working state information of the components in the transmission; the second calculation module 34, the second calculation module 34 is configured to determine the transmission heat dissipation power based on the transmission heat dissipation power, the transmission housing information, the radiator operating state information, the ambient temperature, and the oil body temperature; the third calculating module 36, the third calculating module 36 is used for determining the temperature rise of the transmission oil based on the physical characteristics of the transmission assembly parts and the transmission heat dissipation power; and the oil temperature calculation module 38, the oil temperature calculation module 38 is used for determining the actual oil temperature of the lubricating oil based on the oil body temperature and the transmission oil temperature rise.
Through the device, the heating power of the transmission, the heat dissipation power of the transmission and the oil temperature rise of the transmission are respectively calculated, the actual oil temperature of the lubricating oil is calculated based on the oil body temperature and the oil temperature rise of the transmission, the actual temperature of the lubricating oil of the transmission can be accurately determined by compensating the oil body temperature through the oil temperature rise of the transmission, the precision meets the temperature protection requirement of components of the transmission, and the technical problem that the oil temperature detection is inaccurate under the harsh working condition of the related technology is solved.
It should be noted that the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are located in different processors in any combination.
Embodiments of the present invention also provide a storage medium having a computer program stored therein, wherein the computer program is arranged to perform the steps of any of the above method embodiments when executed.
Alternatively, in the present embodiment, the storage medium may be configured to store a computer program for executing the steps of:
the method comprises the following steps of S1, collecting vehicle running state information, engine running state information, working state information of components in a transmission, transmission shell information, radiator working state information, physical characteristics of transmission assembly parts, and oil body temperature and environmental temperature collected by an oil temperature sensor, wherein the oil temperature sensor is arranged at one end, immersed in lubricating oil, of a control valve body of the transmission, and is used for collecting the oil body temperature of the lubricating oil in the transmission;
s2, determining the heating power of the transmission based on the vehicle running state information, the engine running state information and the working state information of components in the transmission;
s3, determining the heat dissipation power of the transmission based on the heat dissipation power of the transmission, the information of the shell of the transmission, the working state information of a radiator, the ambient temperature and the temperature of oil;
s4, determining the temperature rise of the transmission oil based on the physical characteristics of the transmission assembly parts and the transmission heat dissipation power;
and S5, determining the actual oil temperature of the lubricating oil based on the oil body temperature and the temperature rise of the transmission oil.
Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing computer programs, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.
Embodiments of the present invention also provide a processor arranged to run a computer program to perform the steps of any of the above method embodiments.
Optionally, in this embodiment, the processor may be configured to execute the following steps by a computer program:
the method comprises the following steps that S1, vehicle running state information, engine running state information, working state information of components in the transmission, transmission shell information, radiator working state information, physical characteristics of transmission assembly parts, oil body temperature acquired by an oil temperature sensor and environment temperature are acquired, wherein the oil temperature sensor is arranged at one end, immersed in lubricating oil, of a control valve body of the transmission, and the oil temperature sensor is used for acquiring the oil body temperature of the lubricating oil in the transmission;
s2, determining the heating power of the transmission based on the vehicle running state information, the engine running state information and the working state information of components in the transmission;
s3, determining the heat dissipation power of the transmission based on the heat dissipation power of the transmission, the information of the shell of the transmission, the working state information of a radiator, the ambient temperature and the temperature of oil;
s4, determining the temperature rise of the transmission oil based on the physical characteristics of the transmission assembly parts and the transmission heat dissipation power;
and S5, determining the actual oil temperature of the lubricating oil based on the oil body temperature and the temperature rise of the transmission oil.
Embodiments of the present invention also provide a vehicle including a transmission, and the temperature of the lubricating oil of the transmission is determined by using the above-described method for determining the temperature of the lubricating oil of the transmission.
Optionally, for a specific example in this embodiment, reference may be made to the examples described in the above embodiment and optional implementation, and this embodiment is not described herein again.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or may not be executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method of determining the temperature of transmission oil, the method comprising the steps of:
the method comprises the following steps of collecting vehicle running state information, engine running state information, working state information of components in a transmission, transmission shell information, radiator working state information, physical characteristics of transmission assembly parts, and oil body temperature and environmental temperature collected by an oil temperature sensor, wherein the oil temperature sensor is arranged at one end, immersed in lubricating oil, of a control valve body of the transmission, and is used for collecting the oil body temperature of the lubricating oil in the transmission;
determining the heating power of the transmission based on the vehicle running state information, the engine running state information and the working state information of components in the transmission;
determining a transmission heat dissipation power based on the transmission heat generation power, the transmission case information, the radiator operating state information, the ambient temperature, and the oil body temperature;
determining a transmission oil temperature rise based on physical characteristics of transmission assembly components and the transmission heat dissipation power;
and determining the actual oil temperature of the lubricating oil based on the oil body temperature and the transmission oil temperature rise.
2. The method of claim 1, wherein determining a transmission heating power based on the vehicle operating state information, the engine operating state information, and operating state information of components within the transmission comprises:
inputting the vehicle running state information and the engine running state information into a first calculation model, and outputting a first heating power of a transmission;
inputting the working state information of the components in the transmission into a second calculation model, and outputting second heating power of the transmission;
determining a transmission heating power based on the transmission first heating power and the transmission second heating power.
3. The method of claim 2, wherein determining a transmission heating power based on the transmission first heating power and the transmission second heating power comprises:
collecting vehicle speed information;
determining that the first transmission heating power is the transmission heating power when the vehicle speed is greater than a preset vehicle speed value;
and under the condition that the vehicle speed is smaller than the preset vehicle speed value, determining the second heating power of the transmission as the heating power of the transmission.
4. The method of claim 2, wherein inputting the vehicle operating state information and the engine operating state information into a first computational model and outputting a transmission first heating power comprises:
inputting the vehicle running state information into a first power model and outputting transmission output power;
inputting the engine running state information into a second power model and outputting transmission input power;
inputting the transmission output power and the transmission input power into a third power model, and outputting the transmission first heating power.
5. The method of claim 1, wherein determining a transmission heat dissipation power based on the transmission heat generation power, the transmission case information, the radiator operating state information, the ambient temperature, and the oil body temperature comprises:
inputting the information of the transmission shell, the ambient temperature and the temperature of the oil body into a first heat dissipation model, and outputting the heat dissipation power of the transmission shell;
inputting the working state information of the radiator and the temperature of the oil body into a second heat dissipation model, and outputting the heat dissipation power of the radiator;
and inputting the heat dissipation power of the transmission shell, the heat dissipation power of the radiator and the heat generation power of the transmission into a third heat dissipation model, and outputting the heat dissipation power of the transmission.
6. The method of claim 2, wherein the operating state information of the components in the transmission at least comprises clutch operating state information, bearing operating state information and shaft tooth operating state information, the operating state information of the components in the transmission is input into a second calculation model, and second heating power of the transmission is output, and the method comprises the following steps:
inputting the working state information of the clutch into a clutch heating model, and outputting the heating power of the clutch;
inputting the working state information of the shaft teeth into a first gear heating model, and outputting gear meshing friction heating power;
inputting the working state information of the shaft teeth into a second gear heating model, and outputting gear oil stirring heating power;
inputting the working state information of the bearing into a bearing heating model, and outputting the bearing heating power;
and inputting the clutch heating power, the gear engagement friction heating power, the gear oil stirring heating power and the bearing heating power into a heating calculation model, and outputting a second heating power of the transmission.
7. The method according to claim 1 or 4,
the vehicle running state information includes at least one of: the device comprises a vehicle running speed, a steering wheel steering angle, a tire steering angle, a brake pedal signal, a brake master cylinder pressure signal, an accelerator pedal opening, a rotating speed difference of each wheel, an X-direction acceleration signal and a Y-direction acceleration signal;
the engine operating state information includes at least one of: engine speed, combustion torque, torque loss, throttle opening, and cooling water temperature.
8. The method according to claim 1 or 5,
the transmission housing information includes at least a housing area;
the radiator working state information at least comprises one of the following information: the water inlet temperature of the cooler, the cooling water flow and the heat exchange oil flow;
physical characteristics of the transmission assembly components include at least one of: specific heat capacity, mass.
9. A transmission oil temperature determining apparatus, comprising:
the system comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring vehicle running state information, engine running state information, working state information of components in the transmission, transmission shell information, radiator working state information, physical characteristics of transmission assembly parts, and oil body temperature and ambient temperature acquired by an oil temperature sensor, the oil temperature sensor is arranged at one end, immersed in lubricating oil, of a control valve body of the transmission, and the oil temperature sensor is used for acquiring the oil body temperature of the lubricating oil in the transmission;
the first calculation module is used for determining the heating power of the transmission based on the vehicle running state information, the engine running state information and the working state information of components in the transmission;
a second calculation module for determining a transmission heat dissipation power based on the transmission heat generation power, the transmission case information, the radiator operating state information, the ambient temperature, and the oil body temperature;
a third calculation module for determining a transmission oil temperature rise based on physical characteristics of the transmission assembly components and the transmission heat dissipation power;
and the oil temperature calculation module is used for determining the actual oil temperature of the lubricating oil based on the oil body temperature and the transmission oil temperature rise.
10. A vehicle comprising a transmission, characterized in that the temperature of the transmission oil is determined using the temperature determination method of the transmission oil according to any one of claims 1-8.
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| CN202211521478.XA CN115899228A (en) | 2022-11-30 | 2022-11-30 | Transmission lubricating oil temperature determination method and determination device and vehicle |
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| CN202211521478.XA CN115899228A (en) | 2022-11-30 | 2022-11-30 | Transmission lubricating oil temperature determination method and determination device and vehicle |
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| CN202211521478.XA Pending CN115899228A (en) | 2022-11-30 | 2022-11-30 | Transmission lubricating oil temperature determination method and determination device and vehicle |
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