CN117927845A - Driving device thermal management method, program and storage medium - Google Patents
Driving device thermal management method, program and storage medium Download PDFInfo
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- 238000007726 management method Methods 0.000 title claims abstract description 33
- 238000004364 calculation method Methods 0.000 claims abstract description 57
- 238000005461 lubrication Methods 0.000 claims abstract description 50
- 238000004590 computer program Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 95
- 230000017525 heat dissipation Effects 0.000 claims description 10
- 239000003921 oil Substances 0.000 abstract description 144
- 239000010687 lubricating oil Substances 0.000 abstract description 12
- 238000001816 cooling Methods 0.000 description 11
- 239000003638 chemical reducing agent Substances 0.000 description 8
- 230000001050 lubricating effect Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
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- 239000000110 cooling liquid Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000008111 motor development Effects 0.000 description 1
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Abstract
The embodiment of the application provides a driving device thermal management method, a computer program and a storage medium, and relates to the technical field of thermal management. The method comprises the following steps: acquiring the oil temperature and the temperature of a driving device; when the oil temperature is smaller than a preset first threshold value and the temperature of the driving device is smaller than a preset second threshold value, calculating the oil pump flow through the lubrication flow calculation module; when the oil temperature is greater than a preset first threshold value or the temperature of the driving device is greater than a preset second threshold value, calculating the oil pump flow through a normal flow calculation module; the lubrication flow calculation module is used for calculating the oil pump flow for forming a lubrication film on a piece to be lubricated of the driving device; and under the same rotating speed of the driving device, the flow obtained by the lubrication flow calculation module is smaller than the flow obtained by the normal flow calculation module. At lower temperatures, no excessive amounts of lubricating oil are given to the drive device, thereby facilitating an increase in the oil temperature in the drive device and also reducing the power consumption of the oil pump.
Description
Technical Field
The present application relates to the field of thermal management, and in particular, to a driving device thermal management method, a program, and a storage medium.
Background
The current electric drive oil cooling heat dissipation scheme is a main stream scheme of each large host factory with excellent heat dissipation performance and lower cost. The oil-cooled electric drive generally adopts an electric oil pump to convey oil to an oil-water heat exchanger, and the electric drive and a speed reducer are normally lubricated after high-temperature oil is changed into low-temperature oil through convective heat exchange of the oil-water heat exchanger. When the conventional oil-cooled electric drive is used for electric pump type selection, electric pump power and flow are generally determined through a heat balance checking working condition and some extreme working conditions, and two control modes are generally adopted during electric drive thermal management control, wherein one mode is that the current electric drive temperature is not considered, the flow requirements under all rotating speeds and torque points are determined only according to an electric drive torque and rotating speed matrix diagram, and the flow requirements are obtained through calibration. Another patent application, published as CN113978223a, discloses an electric drive system and a method for controlling the heat thereof, in which: controlling the rotating speed of the water pump to the rotating speed of the water pump according to the temperature of the motor controller; acquiring the operation parameters of the motor, and acquiring the heat productivity of the operation of the motor according to the operation parameters of the motor; obtaining a target lubricating oil amount according to the heating value of the motor operation, the temperature of lubricating oil in an oil pan of a speed reducer and the temperature of water cooling liquid in a radiator; and controlling the rotation speed of the oil pump to the rotation speed of the required oil pump according to the target lubricating oil quantity.
The two control methods are aimed at achieving heat balance of the electric drive and being in a safe temperature range, and the electric drive is low in efficiency due to the fact that the electric drive is slow in temperature rise and even long in time oil temperature rise caused by the fact that heat generation and heat dissipation achieve heat balance to calculate when actual normal demands are calculated.
How to adapt to the starting at lower temperature is a technical problem to be solved by the application.
Disclosure of Invention
The present application aims to provide a drive device thermal management method, program and storage medium to be able to accommodate start-up at a lower temperature.
In order to achieve the above purpose, the following technical scheme is adopted in the embodiment of the application.
In a first aspect, an embodiment of the present application provides a driving device thermal management method, including:
Acquiring the oil temperature and the temperature of a driving device;
when the oil temperature is smaller than a preset first threshold value and the temperature of the driving device is smaller than a preset second threshold value, calculating the oil pump flow through a lubrication flow calculation module;
And when the oil temperature is greater than the preset first threshold value or the temperature of the driving device is greater than the preset second threshold value, calculating the oil pump flow through a normal flow calculation module.
The oil pump can then supply the lubricant to the components of the drive device that need to be lubricated, according to the oil pump flow.
The lubrication flow calculation module is used for calculating the oil pump flow for forming a lubrication film on a part to be lubricated of the driving device; and under the same rotating speed of the driving device, the flow obtained by the lubrication flow calculation module is smaller than the flow obtained by the normal flow calculation module.
Optionally, the step of calculating the oil pump flow by the lubrication flow calculation module includes:
And obtaining the oil pump flow according to the interval where the oil temperature is and the interval where the operating parameter of the driving device is. Therefore, the flow of the lubricating oil can be accurately controlled according to the oil temperature and the conditions of the driving device, and the flow of the lubricating oil is prevented from flowing too much while the accurate lubricating effect is realized.
Optionally, the driving device thermal management method further comprises:
and obtaining the flow of the oil pump according to the interval where the oil temperature is and the heating power of the driving device.
Whether the lubrication flow calculation module or the normal flow calculation module is adopted, the flow can be calculated according to the interval where the oil temperature is and the heating power of the driving device, so that the flow is more in accordance with the conditions of the oil temperature and the specific state of the driving device.
Optionally, the step of calculating the oil pump flow by the lubrication flow calculation module includes:
Obtaining flow required by at least two parts of the driving device according to the oil temperature and the heating power of at least two parts of the driving device;
Obtaining the total flow of the oil pump respectively obtained by at least two parts of the driving device according to the flow respectively required by at least two parts of the driving device and the flow distribution coefficient of at least two parts of the driving device; the flow distribution coefficient is the duty ratio of the total flow of the oil pump distributed to the part of the driving device;
and taking the maximum value of the total flow of the oil pump obtained by at least two parts of the driving device as the total flow of the oil pump.
This ensures that sufficient flow is available in the various parts of the drive.
Optionally, the drive means comprises rotation means;
the step of calculating the oil pump flow by the lubrication flow calculation module includes:
And according to the rotating speed of the rotating device, the torque and the oil temperature of the rotating device, the flow required by the rotating device is obtained through table lookup. Thus, the rotating device can be ensured to obtain proper lubricating oil flow.
Optionally, the step of calculating the oil pump flow by the lubrication flow calculation module includes:
Judging whether the heating value or the heating speed of the driving device reaches a preset heating threshold value or not;
And when the heating value or the heating speed of the driving device reaches a preset heating threshold value, taking the preset maximum flow as the flow of the oil pump.
The preset heating threshold is set, so that whether the heating is too large or too fast can be detected, the control of small flow can be omitted when the heating is too large or too fast, and in order to protect parts and achieve a better lubricating effect, the larger flow can be directly used.
Optionally, the step of calculating the oil pump flow by the lubrication flow calculation module includes:
Judging whether the heating value or the heating speed of the driving device reaches a preset heating threshold value or not;
And when the heating value or the heating speed of the driving device does not reach the preset heating threshold, obtaining the flow required by the driving device according to the average heating power of the driving device at the preset first time and the heat dissipation coefficient of the driving device.
When the heating is normal, the flow required by the driving device can be calculated according to the heating power and the heat dissipation coefficient in a short time. The heat dissipation factor may vary depending on the circumstances, such as wind speed, and this calculation has sufficient flexibility.
Optionally, the step of determining whether the heating value or the heating speed of the driving device reaches a preset heating threshold value includes:
And calculating the ratio of the integral of the heating power of the driving device in the preset second time to the preset second time, and judging whether the heating speed of the driving device reaches a preset heating threshold. The second time may be the same as the first time, and the second time may be shorter than the first time, and may have a faster response speed.
Optionally, the preset maximum flow rate includes a plurality of preset maximum flow rates, and the step of taking the preset maximum flow rate as the oil pump flow rate includes: and selecting one from a plurality of preset maximum flow rates as the oil pump flow rate according to the section where the heating value or the heating speed of the driving device is located.
Optionally, the driving device thermal management method further comprises:
acquiring a rotating speed or an accelerator signal of the driving device;
and when the rotating speed of the driving device or the throttle signal reaches a preset threshold value, taking the preset maximum flow as the flow of the oil pump.
When the accelerator is stepped on suddenly, in order to ensure lubrication of parts, the maximum flow can be directly used as the oil supply flow, and the time delay caused by the calculation process is omitted.
In a second aspect, an embodiment of the present application provides a computer readable storage medium, where a computer program or an instruction is stored, and when the computer program or the instruction is executed by a computer, the driving apparatus thermal management method of the first aspect is implemented.
In a third aspect, an embodiment of the present application provides a computer program, the computer program including instructions, which when executed by a computer, cause the computer to perform the driving apparatus thermal management method of the first aspect.
Compared with the prior art, the application has the following beneficial effects:
According to the driving device heat management method provided by the embodiment of the application, whether the oil pump flow is required to be calculated by the lubrication flow calculation module is judged according to the oil temperature and the driving device temperature, and when the vehicle is just started, the oil temperature is usually low, so that the oil pump flow is calculated by the lubrication flow calculation module, excessive lubricating oil is not given to the driving device, the oil temperature in the driving device is increased, and the power consumption of the oil pump can be reduced. The lubrication flow rate at this time is a flow rate at which an oil film is formed just as measured in advance, and may be measured based on mechanical parameters such as a rotational speed and a torque, or may be a specific flow rate measured under various conditions such as mechanical parameters such as a rotational speed and a torque at each oil temperature, so that it is sufficient to ensure the operation of the drive device.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a thermal management method of a driving device according to an embodiment of the present application;
fig. 2 is a schematic diagram of a lubrication oil path according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a method for calculating oil pump flow according to an embodiment of the present application;
Fig. 4 is a schematic diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. The following embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present application, it should be noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The term "coupled" is to be interpreted broadly, as being a fixed connection, a removable connection, or an integral connection, for example; can be directly connected or indirectly connected through an intermediate medium.
In the prior art, the oil flow is not considered to be started at low temperature, and excessive oil flow is given, so that the oil temperature cannot be raised, and the efficiency of the driving device is low.
The driving device is an electric drive and can comprise a motor and a speed reducer. When the automobile is started at a low temperature, the temperature of the oil is slowly increased by using the prior art scheme, so that the electric drive efficiency is low.
Referring to fig. 1, an embodiment of the present application provides a driving device thermal management method, including (S indicates steps below, and the following numbers do not limit the sequence):
s1, acquiring oil temperature and driving device temperature;
S2, calculating the flow of an oil pump through a lubrication flow calculation module when the oil temperature is smaller than a preset first threshold value and the temperature of the driving device is smaller than a preset second threshold value;
S3, calculating the oil pump flow through a normal flow calculation module when the oil temperature is greater than the preset first threshold value or the temperature of the driving device is greater than the preset second threshold value.
The oil pump can then supply the lubrication oil to the lubrication-requiring parts in the drive device according to the oil pump flow.
The lubrication flow calculation module is used for calculating oil pump flow for forming a lubrication film on a part to be lubricated of the driving device; and under the same rotating speed of the driving device, the flow obtained by the lubrication flow calculation module is smaller than the flow obtained by the normal flow calculation module.
The driving device heat management method has the following effects:
1. At a lower temperature, excessive lubricating oil is not given to the driving device, so that the temperature of the oil in the driving device is increased, and better lubricating effect and efficiency are achieved after the temperature of the lubricating oil is increased;
2. At a lower temperature, the flow is smaller, so that the power consumption of the oil pump can be reduced;
3. at a lower temperature, the lubrication flow is a flow which is determined in advance and just forms an oil film, and is determined according to mechanical parameters such as rotating speed, torque and the like, so that the operation of a driving device is ensured;
4. At higher temperatures, a normal flow greater than the oil pump flow calculated by the lubrication flow calculation module is used, so that the lubrication oil can be well utilized to cool the driving device.
The driving device thermal management method can be applied to vehicle starting, when the vehicle is started, the oil temperature is the same as the ambient temperature, the vehicle runs at the moment, the oil temperature and the water temperature in a vehicle cooling system are both at lower temperatures, the system base temperature is low, too much cooling flow is not needed when the electric drive system heats, only a certain lubrication flow is needed, and the oil pump flow calculated by the lubrication flow calculation module meets the requirement.
Regarding the calculation of the oil pump flow by the lubrication flow calculation module in S2, the flow required to form the oil film is often related to conditions such as stress conditions, temperature conditions, etc., for example, the larger the stress is, the larger the required flow is, so that the oil film can be prevented from being broken.
The stress condition can be reflected according to the running parameters of the driving device, such as the rotating speed, the torque and the like, so that the oil pump flow is obtained according to the interval where the oil temperature is and the interval where the running parameters of the driving device are.
The mechanical state parameters of the most severe working part of all parts can be considered, for example, a driving device comprises a pair of gears with larger transmission power, if the lubrication of the gears is insufficient, an oil film cannot be formed or the oil film can be broken, and the oil film is extruded and broken, so that the gears can be corroded at points, glued and the like, and the gears fail. The lubrication flow rate required for the drive means can thus be determined on the basis of one of the lubrication flow rates required for the pair of gears as a condition.
Regarding the calculation of the oil pump flow rate by the normal flow rate calculation module in S3, the oil pump flow rate may be fixed or may vary within a certain range. The flow rate of the lubricating oil has a cooling effect, so that the flow rate can be given after the calculation of the heating value or the heating power of the driving device, and different heating values or heating powers can be corresponding to different flow rates.
The driving means may include a rotating means, and the step of calculating the oil pump flow rate by the lubrication flow rate calculation module or the normal flow rate calculation module may include: and according to the rotating speed of the rotating device, the torque and the oil temperature of the rotating device, the flow required by the rotating device is obtained through table lookup.
The driving device thermal management method can be applied to a new energy vehicle, and for the new energy vehicle, the driving device comprises a motor and a speed reducer, and can run a heating power calculation program to calculate heating power after the whole vehicle is electrified and starts to run. Meanwhile, the oil temperature and the motor temperature can be obtained, and the driving device temperature comprises the motor temperature.
The calculation of the heating power may include calculation of the motor heating power pm_loss and calculation of the decelerator heating power pr_loss.
For the motor heating power Pm_loss, table lookup can be performed according to the motor temperature, torque and rotating speed (the table can be the motor efficiency Map calibrated through experiments in development) to obtain the motor heating power Pm_loss. The motor temperature can be obtained by a motor temperature sensor arranged at the position of highest temperature in the temperature field when the motor works. The position can be obtained through calibration during motor development.
The heating power Pr_loss of the speed reducer can be obtained by looking up a table according to the torque and the rotating speed of one shaft in the speed reducer (the table can be the efficiency Map of the speed reducer calibrated through experiments during development).
The calculation of the heating power may further include calculating the heating power Prb_loss of an actively cooled lubricated component in the speed reducer, where the actively cooled lubricated component may be a bearing or a gear, and may be the most severely stressed component that is most prone to failure. The stress calculation can be carried out according to the input torque of the active cooling lubricating component, the corresponding relation between the input torque or related conditions and the heating power is determined during development, and the corresponding relation is made into a table, so that the heating power Prb_loss of the active cooling lubricating component is obtained through table lookup during subsequent application.
The above is an example of the heating power calculation module for obtaining the heating power in a table look-up manner. In the lubrication flow calculation module, the flow of the oil pump can be calculated according to the heating power, so that the lubrication flow plays a role in adapting to the heating power.
After the oil temperature Toil and the motor temperature Tm are acquired, the following three cases can be classified according to the relationship of the oil temperature Toil and the balanced oil temperature threshold toil_yu (the balanced oil temperature threshold is set to 70 ℃ for example) and the relationship of the motor temperature Tm and the motor safety temperature threshold tm_yu (the motor safety temperature threshold is set to 100 ℃ for example):
1.Toil＞Toil_yu；
Il < il_yu and Tm is not less than Tm_yu; at this time, the lubricating oil plays a role in cooling the motor;
Sil < sil_yu and Tm < tm_yu. The embodiments described below can be used in all three cases, and correspondingly different oil pump flows can be obtained by using the same formula or the same table look-up mode.
To illustrate one implementation detail applied to the above three cases, the concept of "system flow distribution ratio" is introduced, as in fig. 2, the total flow of the oil pump may pass through the main line, the filter and the cooler, and then may be divided into different oil paths, for example, 5 paths in total, namely, the oil path 1, the oil path 2, the oil path 3, the oil path 4, and the oil path 5. The diameter of the pipeline of each path of oil way can be different, and the diameter of the nozzle at the tail end of the oil way can be different, so that a fixed distribution ratio can be arranged between each nozzle, and the distribution ratio can be calculated at the beginning of design. The 5-way oil paths have 5 total injection positions, and their distribution ratio (i.e., system flow distribution ratio) may be 1:1.5:2:5:0.5, if the oil pump has an oil flow of 10L/min, the flow distributed to these 5 ports is 1L/min, 1.5L/min, 2L/min, 5L/min, 0.5L/min. The jet ports may spray oil onto the actively cooled lubricated parts as described above.
The relationship of Toil, prb_loss and the flow Frb _loss required to actively cool the lubricated component can be calibrated as follows: given different oil temperatures Toil, different speed-torque combinations (speed-torque combination parameters may be converted to Prb_loss), and different cooling flows of the component, different conditions are established; operating under these conditions, experimental results, such as good, bad, etc., are obtained, and based on a comparison between the experimental results, the optimal cooling flow for the component is determined as the flow Frb _loss required for the component. The oil temperature, the rotation speed-torque and the flow rate can be set in a partition mode, and can be set according to the size and the control complexity of the standard quantity, for example, the oil temperature is set in a partition mode of-40 ℃ to-10 ℃,10 ℃ to-20 ℃, 20 ℃ to 50 ℃ and 50 ℃ to 70 ℃.
Frb _loss of a plurality of active cooling lubricating components can be obtained, the flow distribution ratios of the plurality of active cooling lubricating components are different, and each Frb _loss can calculate a total oil pump flow. The calculated maximum total oil pump flow should be used as the oil pump flow, so that a sufficient flow can be ensured for each actively cooled lubrication part. As shown in fig. 3, the step of calculating the oil pump flow rate by the lubrication flow rate calculation module or the step of calculating the oil pump flow rate by the normal flow rate calculation module may include:
S11, obtaining flow required by at least two parts of the driving device according to the oil temperature and heating power of at least two parts of the driving device;
S12, obtaining total flow of the oil pump respectively obtained by at least two parts of the driving device according to the flow respectively required by at least two parts of the driving device and the flow distribution coefficient of at least two parts of the driving device; the flow distribution coefficient is the duty ratio of the total flow of the oil pump distributed to the part of the driving device;
S13, taking the maximum value in the total flow of the oil pump obtained by at least two parts of the driving device as the total flow of the oil pump.
After the heating power prb_loss of the actively cooled lubrication component is obtained, the flow rate may be calculated from prb_loss; the oil pump flow can also be obtained by calculating Frb _loss of the component according to the initial oil temperature, the average value of the heating power Prb_loss of the actively cooled lubricating component in a period of time (for example, 5s or 10s is integrated and divided by the period of time, the time length can be determined by the heating characteristic and the temperature rise characteristic of the component, if the temperature rise rate is smaller and the heat capacity is larger, the period of time can be longer properly), the shell heat dissipation coefficient, the heat exchange coefficient and the like during research and development, and further according to Frb _loss and the distribution ratio of the component in the system flow.
In a special case, for example, when a user suddenly steps on an accelerator, the driving device may need to accelerate suddenly in a low-temperature environment, and the heating value of the system (the heating value of the system may be pm_loss+pr_loss) increases suddenly, the oil temperature is sufficiently fast to raise, and in order to ensure the lubrication between the parts, the oil may be directly supplied with a preset maximum flow, that is, the oil pump flow is set to a preset maximum flow, and the preset maximum flow may be the flow of the maximum oil supply capacity of the oil pump. The preset maximum flow rate may be set to different values according to the conditions such as the rotation speed, the oil temperature, the heating value of the driving device, the section where the heating speed is located, and the like. For example, different intervals where the heating values or the heating speeds of the driving devices are located correspondingly obtain different preset maximum flow rates as oil pump flow rates.
For the special case described above, a judgment step may be provided: and judging whether the heating value or the heating speed of the driving device reaches a preset heating threshold value.
When the heating value or the heating speed of the driving device does not reach the preset heating threshold, namely the preset maximum flow is not needed to be used as the flow of the oil pump, the flow needed by the driving device can be obtained according to the average heating power of the driving device at the preset first time and the heat dissipation coefficient of the driving device.
In order to determine whether a preset maximum flow rate is required as the oil pump flow rate, this can be done: and calculating the ratio of the integral of the heating power of the driving device in the preset second time to the preset second time, wherein the ratio is equivalent to the heating speed, and judging whether the heating speed of the driving device reaches a preset heating threshold.
In another embodiment, when the driving device suddenly accelerates, the calculation step is directly omitted, and only the judgment is based on the rotation speed or the throttle signal, and if the judgment is met, the oil is directly supplied at the maximum flow, i.e. the driving device thermal management method further comprises:
acquiring a rotating speed or an accelerator signal of the driving device;
and when the rotating speed of the driving device or the throttle signal reaches a preset threshold value, taking the preset maximum flow as the flow of the oil pump.
Based on the above embodiments, the embodiments of the present application provide a computer program including instructions that, when executed by a computer, cause the computer to perform the driving apparatus thermal management method described above.
Based on the above embodiments, the embodiments of the present application further provide a computer readable storage medium having a computer program or instructions stored therein, which when executed by a computer, implement the driving apparatus thermal management method described above.
Based on the above embodiment, as shown in fig. 4, the embodiment of the present application further provides an electronic device 10, where the electronic device includes a memory 11 and a processor 12, the memory is electrically connected to the processor, and a computer program is stored in the memory, and when the processor executes the computer program, the processor implements the spline press-fitting force calculation method described above.
In general, the present application provides a driving device thermal management method, a computer program, and a computer readable storage medium, which can implement partition control according to an oil temperature and a driving device temperature, when the oil temperature is lower than a first threshold value, an oil pump flow rate can be given according to a principle of a current minimum lubrication flow rate of a system, and when the oil temperature is higher than or equal to the first threshold value, the oil pump flow rate can be given after calculation according to a heating value. Therefore, in the running process of the vehicle, the heat dissipation capacity of the system can enable the oil to be heated up as quickly as possible, and meanwhile, the power consumption of the oil pump can be reduced.
The above-described embodiments of the apparatus and system are merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the objectives of the present embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The foregoing is only a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present application should be covered by the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims (10)
1. A method of thermal management of a drive device, comprising:
Acquiring the oil temperature and the temperature of a driving device;
when the oil temperature is smaller than a preset first threshold value and the temperature of the driving device is smaller than a preset second threshold value, calculating the oil pump flow through a lubrication flow calculation module;
When the oil temperature is greater than the preset first threshold value or the temperature of the driving device is greater than the preset second threshold value, calculating the oil pump flow through a normal flow calculation module;
the lubrication flow calculation module is used for calculating the oil pump flow for forming a lubrication film on a part to be lubricated of the driving device; and under the same rotating speed of the driving device, the flow obtained by the lubrication flow calculation module is smaller than the flow obtained by the normal flow calculation module.
2. The drive thermal management method of claim 1, wherein the step of calculating the oil pump flow by the lubrication flow calculation module comprises:
and obtaining the oil pump flow according to the interval where the oil temperature is and the interval where the operating parameter of the driving device is.
3. The drive thermal management method of claim 1, wherein the step of calculating the oil pump flow by the lubrication flow calculation module comprises:
Obtaining flow required by at least two parts of the driving device according to the oil temperature and the heating power of at least two parts of the driving device;
Obtaining the total flow of the oil pump respectively obtained by at least two parts of the driving device according to the flow respectively required by at least two parts of the driving device and the flow distribution coefficient of at least two parts of the driving device; the flow distribution coefficient is the duty ratio of the total flow of the oil pump distributed to the part of the driving device;
and taking the maximum value of the total flow of the oil pump obtained by at least two parts of the driving device as the total flow of the oil pump.
4. The drive thermal management method of claim 1, wherein the drive comprises a rotating device;
the step of calculating the oil pump flow by the lubrication flow calculation module includes:
and according to the rotating speed of the rotating device, the torque and the oil temperature of the rotating device, the flow required by the rotating device is obtained through table lookup.
5. The drive thermal management method of claim 1, wherein the step of calculating the oil pump flow by the lubrication flow calculation module comprises:
Judging whether the heating value or the heating speed of the driving device reaches a preset heating threshold value or not;
And when the heating value or the heating speed of the driving device does not reach the preset heating threshold, obtaining the flow required by the driving device according to the average heating power of the driving device at the preset first time and the heat dissipation coefficient of the driving device.
6. The drive thermal management method of claim 1, wherein the step of calculating the oil pump flow by the lubrication flow calculation module comprises:
Judging whether the heating value or the heating speed of the driving device reaches a preset heating threshold value or not;
And when the heating value or the heating speed of the driving device reaches a preset heating threshold value, taking the preset maximum flow as the flow of the oil pump.
7. The driving device thermal management method according to claim 5 or 6, wherein the step of judging whether or not the heating value or the heating speed of the driving device reaches a preset heating threshold value comprises:
calculating the ratio of the integral of the heating power of the driving device in the preset second time to obtain the heating speed of the driving device, and judging whether the heating speed reaches a preset heating threshold.
8. The driving apparatus thermal management method according to claim 5 or 6, wherein the preset maximum flow rate includes a plurality of, and the step of taking the preset maximum flow rate as the oil pump flow rate includes: and selecting one from a plurality of preset maximum flow rates as the oil pump flow rate according to the section where the heating value or the heating speed of the driving device is located.
9. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a computer program or instructions which, when executed by a computer, implement the drive thermal management method of any one of claims 1-8.
10. A computer program comprising instructions which, when executed by a computer, cause the computer to perform the drive device thermal management method of any one of claims 1-8.
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| CN202311727156.5A CN117927845A (en) | 2023-12-14 | 2023-12-14 | Driving device thermal management method, program and storage medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311727156.5A CN117927845A (en) | 2023-12-14 | 2023-12-14 | Driving device thermal management method, program and storage medium |
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