CN115898842A - Method and device for accurately controlling output flow of oil pump by electric drive assembly - Google Patents
Method and device for accurately controlling output flow of oil pump by electric drive assembly Download PDFInfo
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- CN115898842A CN115898842A CN202211521985.3A CN202211521985A CN115898842A CN 115898842 A CN115898842 A CN 115898842A CN 202211521985 A CN202211521985 A CN 202211521985A CN 115898842 A CN115898842 A CN 115898842A
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- 238000001816 cooling Methods 0.000 claims abstract description 202
- 238000005057 refrigeration Methods 0.000 claims abstract description 8
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- 238000004804 winding Methods 0.000 claims description 9
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a method for accurately controlling the output flow of an oil pump by an electric drive assembly, which comprises the steps of receiving a refrigeration request of the electric drive assembly; acquiring the temperature of cooling oil in an electric drive assembly and the flow demand of the cooling oil; determining a flow resistance of the cooling oil based on the temperature of the cooling oil and the flow demand of the cooling oil; determining a rotational speed demand of the oil pump based on the flow demand of the cooling oil and the flow resistance of the cooling oil; the output flow of the oil pump is controlled based on the rotational speed demand of the oil pump. According to the method, the change of the flow resistance of the cooling oil at different temperatures is considered, so that the accurate control of the flow of the oil pump can be realized at any temperature, the accurate cooling requirement of the electric drive assembly is met, the problem that the system is over-temperature due to insufficient cooling is avoided, the driving performance of the whole vehicle is reduced, and the customer experience is poor; or the excessive cooling is avoided, so that the power consumption of the thermal management system is increased, and the energy waste is caused.
Description
Technical Field
The application relates to the field of vehicle design, in particular to a method and a device for accurately controlling the flow of an oil pump by an electric drive assembly.
Background
The refrigerant medium of the electric drive assembly needs to be in a heat exchange mode, so that the heat of the motor is controlled, the maximum output potential of the motor is ensured, and meanwhile, the electric drive assembly needs to be in contact with an electric module, a sensor, a circuit and the like, so that the electric drive assembly has the functions of ensuring the electric safety (compatibility and insulation with motor materials) and copper corrosion protection. Therefore, the cooling method of the electric drive assembly generally adopts oil cooling at present. Specifically, the oil quantity demand of the cooling oil is calculated according to the requirements of the peak power of the motor, the winding temperature and the like, and the output flow is the required value by calibrating the rotating speed of the oil pump.
However, most of the current oil pump speed control for the electric drive assembly is calibrated according to parameters under normal temperature conditions (for example, oil temperature is 60-90 ℃), the corresponding relation between the speed and the flow at other temperatures is not calibrated, and the flow resistance of the cooling oil is not considered to change along with the temperature and the flow. So that the following problems occur.
1) At normal temperature, the load of the electric drive assembly is constantly changed to cause the oil temperature to be changed, the flow resistance of the system is also constantly changed, and the actual flow corresponding to the same oil pump rotating speed is different from a calibration value, so that the flow control is inaccurate.
2) When the temperature is low, the flow resistance of the system with the same flow rate is greatly increased compared with the normal temperature, and the difference value between the actual output flow rate and the required flow rate is very large and the flow rate control is also very inaccurate due to the fact that the rotating speed of the oil pump is controlled by using the corresponding relation between the rotating speed and the flow rate calibrated at the normal temperature.
3) The inaccurate flow control of the system cooling oil leads to the fact that the electric drive assembly cannot accurately control the cooling condition, for example, the insufficient cooling may lead to the over-temperature fault of the system, the drivability of the whole vehicle is reduced, and the customer experience is poor; or excessive cooling, the power consumption of the thermal management system is increased, and energy is wasted.
Therefore, how to accurately control the output flow of the oil pump based on the oil demand has become a technical problem to be solved urgently.
Disclosure of Invention
In order to solve the technical problem that the output flow of an oil pump cannot be accurately controlled based on the oil quantity demand in the prior art.
According to a first aspect of the present invention, there is provided a method for accurately controlling the output flow of an oil pump for an electric drive assembly, the method comprising:
receiving a refrigeration request of an electric drive assembly; acquiring the temperature of cooling oil in an electric drive assembly and the flow demand of the cooling oil; determining a flow resistance of the cooling oil based on the temperature of the cooling oil and the flow demand of the cooling oil; determining a rotational speed demand of the oil pump based on the flow demand of the cooling oil and the flow resistance of the cooling oil; the output flow of the oil pump is controlled based on the rotational speed demand of the oil pump.
Preferably, the determining of the flow resistance of the cooling oil based on the temperature of the cooling oil and the flow demand of the cooling oil comprises:
acquiring a first corresponding relation, wherein the first corresponding relation is the corresponding relation among the temperature of the cooling oil, the flow demand of the cooling oil and the flow resistance of the cooling oil;
the flow resistance of the cooling oil is determined based on the first correspondence.
Preferably, the determining of the flow resistance of the cooling oil based on the first correspondence relationship includes:
the flow resistance of the cooling oil corresponding to the temperature of the cooling oil and the flow demand of the cooling oil is calculated by a difference method.
Preferably, the determining the rotational speed demand of the oil pump based on the flow demand of the cooling oil and the flow resistance of the cooling oil comprises:
acquiring a second corresponding relation, wherein the second corresponding relation is the corresponding relation among the flow demand of the cooling oil, the flow resistance of the cooling oil and the rotating speed demand of the oil pump;
the rotational speed demand of the oil pump is determined based on the second correspondence.
Preferably, the determining the rotation speed demand of the oil pump based on the second correspondence relationship includes:
and calculating the rotating speed requirement of the oil pump corresponding to the flow requirement of the cooling oil and the flow resistance of the cooling oil by a difference method.
Preferably, the method of determining the flow demand of the cooling oil comprises:
acquiring the peak power and the winding temperature of the motor;
the oil demand of the cooling oil is determined on the basis of the peak power of the electric machine and the winding temperature.
Preferably, the controlling of the output flow rate of the oil pump based on the rotation speed demand of the oil pump includes:
and controlling the execution rotating speed of the oil pump based on the rotating speed requirement of the oil pump so that the output flow of the oil pump meets the requirement.
According to a second aspect of the present invention, there is provided an apparatus for an electric drive assembly to precisely control an output flow of an oil pump, the apparatus comprising:
the receiving module is used for receiving a refrigeration request of the electric drive assembly;
the acquisition module is used for acquiring the temperature of cooling oil in the electric drive assembly and the flow demand of the cooling oil;
the device comprises a first determination module, a second determination module and a control module, wherein the first determination module is used for determining the flow resistance of the cooling oil based on the temperature of the cooling oil and the flow demand of the cooling oil;
the second determination module is used for determining the rotating speed requirement of the oil pump based on the flow requirement of the cooling oil and the flow resistance of the cooling oil;
and the control module controls the output flow of the oil pump based on the rotating speed requirement of the oil pump.
Optionally, the first determining module is configured to obtain a first corresponding relationship, where the first corresponding relationship is a corresponding relationship between a temperature of the cooling oil, a flow demand of the cooling oil, and a flow resistance of the cooling oil; the flow resistance of the cooling oil is determined based on the first correspondence.
Optionally, the first determining module is configured to calculate, by a difference method, a flow resistance of the cooling oil corresponding to the temperature of the cooling oil and the flow demand of the cooling oil.
Optionally, the second determining module is configured to obtain a second corresponding relationship, where the second corresponding relationship is a corresponding relationship between a flow demand of the cooling oil, a flow resistance of the cooling oil, and a rotation speed demand of the oil pump;
the rotational speed demand of the oil pump is determined based on the second correspondence.
Optionally, the second determining module is configured to calculate, by using a difference method, a rotation speed requirement of the oil pump corresponding to the flow requirement of the cooling oil and the flow resistance of the cooling oil.
Optionally, the third determining module is configured to obtain a peak power of the motor and a winding temperature; the oil demand for the cooling oil is determined based on the peak power of the motor and the winding temperature.
Optionally, the control module is configured to control the execution speed of the oil pump based on the speed requirement of the oil pump, so that the output flow of the oil pump meets the requirement.
According to a third aspect of the present invention, there is provided an electronic apparatus comprising: a processor and a memory storing computer program instructions;
the processor, when executing the computer program instructions, implements the above-described method for the electric drive assembly to precisely control the output flow of the oil pump.
According to a fourth aspect of the present invention, there is provided a computer readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the above-described method for an electric drive assembly to precisely control an output flow of an oil pump.
In summary, after the vehicle controller or the motor controller receives a refrigeration request of the electric drive assembly; acquiring the temperature of cooling oil in an electric drive assembly and the flow demand of the cooling oil; determining a flow resistance of the cooling oil based on the temperature of the cooling oil and the flow demand of the cooling oil; determining a rotational speed demand of the oil pump based on the flow demand of the cooling oil and the flow resistance of the cooling oil; the output flow of the oil pump is controlled based on the rotational speed demand of the oil pump. According to the method, the flow resistance change of the cooling oil at different temperatures is considered, so that the flow rate of the oil pump can be accurately controlled at any temperature, the accurate cooling requirement of the electric drive assembly is met, the problem that the system is over-temperature fault due to insufficient cooling is avoided, the driving performance of the whole vehicle is reduced, and the customer experience is poor; or the excessive cooling is avoided, so that the power consumption of the thermal management system is increased, and the energy waste is caused.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a method for an electric drive assembly to precisely control an output flow of an oil pump according to an embodiment of the present disclosure;
FIG. 2 is a flowchart illustrating a control process of a method for accurately controlling an output flow of an oil pump by an electric drive assembly according to an embodiment of the present disclosure;
FIG. 3 is a first map of a method for accurately controlling output flow of an oil pump by an electric drive assembly according to an embodiment of the present disclosure;
FIG. 4 is a second map of a method for accurately controlling the output flow of the oil pump by the electric drive assembly according to the embodiment of the present disclosure;
FIG. 5 is a block diagram of an apparatus for an electric drive assembly to precisely control an output flow of an oil pump according to an embodiment of the present disclosure;
fig. 6 is a block diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the above and other features and advantages of the present application more apparent, the present application is further described below with reference to the accompanying drawings. It is understood that the specific embodiments described herein are for purposes of illustration only and are not intended to be limiting.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the specific details need not be employed to practice the present application. In other instances, well-known steps or operations are not described in detail to avoid obscuring the present application.
Because the output flow of the oil pump cannot be accurately controlled based on the oil quantity demand in the prior art, the system over-temperature fault caused by insufficient cooling can be caused, the driving performance of the whole vehicle is reduced, and the customer experience is poor; or the cooling is excessive, the power consumption of the thermal management system is increased, and the energy waste is caused.
Referring to fig. 1-2, the present application provides a method for an electric drive assembly to precisely control an output flow of an oil pump, the method comprising:
and S110, receiving a refrigeration request of the electric drive assembly.
In some embodiments, the execution subject of the present application may be a vehicle controller or a motor controller, and the vehicle controller or the motor controller may start a cooling function of the electric drive assembly after receiving a cooling request of the electric drive assembly. The cooling request may be sent when the vehicle is started, or may be sent when the oil temperature of the cooling oil reaches a certain threshold, for example, when the oil temperature of the cooling oil exceeds 60 ℃, the cooling request of the electric drive assembly is sent to the vehicle controller or the motor controller.
And S120, acquiring the temperature of the cooling oil in the electric drive assembly and the flow demand of the cooling oil.
In some embodiments, after the vehicle controller or the motor controller starts the cooling function, the temperature of the cooling oil in the electric drive assembly and the flow demand of the cooling oil are acquired in real time, wherein the flow demand of the cooling oil can be determined according to the peak power of the motor and the winding temperature.
And S130, determining the flow resistance of the cooling oil based on the temperature of the cooling oil and the flow demand of the cooling oil.
In some embodiments, the vehicle controller or the motor controller first obtains a first corresponding relationship, where the first corresponding relationship is a corresponding relationship between a temperature of the cooling oil, a flow demand of the cooling oil, and a flow resistance of the cooling oil; and then calculating the flow resistance of the cooling oil corresponding to the acquired temperature of the cooling oil and the flow demand of the cooling oil by a difference method based on the first corresponding relation.
In a specific embodiment, refer to FIG. 3 and tables one and two; wherein, the curve in fig. 3 is the corresponding relation between the flow demand of the cooling oil and the flow resistance of the cooling oil at different temperatures; in fig. 3, the abscissa is the oil pump flow, and the ordinate is the flow resistance, where the oil pump flow is the flow demand of the cooling oil, and the flow resistance is the flow resistance of the cooling oil. Tables one and two are measurements of the flow demand of the cooling oil and the flow resistance of the cooling oil at different calibration points of the curves of fig. 3 for different temperatures. The graph of fig. 3 can thus be plotted according to table one and table two.
Further, with reference to fig. 3, according to the flow demand of the cooling oil and the temperature of the cooling oil obtained by the vehicle controller or the motor controller, a corresponding flow resistance may be obtained in the corresponding curve in fig. 3. If the flow demand of the cooling oil is just the calibrated value of the oil pump flow in the graph, the flow resistance of the cooling oil can be directly inquired and obtained, and if the flow demand of the cooling oil is between the calibrated values of the oil pump flow in the graph, for example, the flow demand of the cooling oil is between 8L/min and 9/min, the corresponding flow resistance of the cooling oil can be calculated by using a difference method.
In this embodiment, the interval of the temperature curves is 10 ℃, and in order to further improve the accuracy, the interval of the temperature curves may be adaptively reduced, for example, to 5 ℃, 1 ℃ and the like.
Watch 1
Watch two
And S140, determining the rotating speed requirement of the oil pump based on the flow requirement of the cooling oil and the flow resistance of the cooling oil.
In some embodiments, the vehicle controller or the motor controller obtains a second corresponding relationship, wherein the second corresponding relationship is a corresponding relationship between a flow demand of the cooling oil, a flow resistance of the cooling oil, and a rotation speed demand of the oil pump; and determines a rotational speed demand of the oil pump based on the second correspondence relationship.
In a specific embodiment, refer to fig. 4; wherein, the curve in fig. 4 is the corresponding relation between the flow demand of the cooling oil and the flow resistance of the cooling oil at different rotational speeds of the oil pump; in fig. 4, the abscissa is the output flow of the oil pump, and the ordinate is the output pressure of the oil pump, where the output flow of the oil pump is the flow demand of the cooling oil, and the output pressure of the oil pump is the flow resistance of the cooling oil. It is thus possible to determine the rotational speed demand of the oil pump by the difference method using the acquired flow demand of the cooling oil and the flow resistance of the cooling oil, using the second correspondence in fig. 4.
In fig. 4, the interval of the rotation speed of the oil pump is 10% of the maximum rotation speed of the oil pump, and in order to further improve the accuracy, other intervals may be provided, and the smaller the interval, the higher the accuracy. Wherein the output pressure of the oil pump ranges from 0 to the maximum output pressure of the oil pump.
And S150, controlling the output flow of the oil pump based on the rotation speed requirement of the oil pump.
In some embodiments, after the vehicle control unit or the motor controller determines the rotation speed requirement of the oil pump based on the temperature of the cooling oil and the flow requirement of the cooling oil, a control command is sent to the oil pump to be executed, and the control adjusts the rotation speed of the oil pump to a required value, so that the accurate control of the output flow of the oil pump is realized.
Referring to fig. 5, the present application further provides an apparatus for precisely controlling the output flow of an oil pump for an electric drive assembly, the apparatus comprising:
a receiving module 501, configured to receive a refrigeration request of an electric drive assembly;
in some embodiments, the execution subject of the present application may be a vehicle controller or a motor controller, and the vehicle controller or the motor controller may start a cooling function of the electric drive assembly after receiving a cooling request of the electric drive assembly. The cooling request may be sent when the vehicle is started, or may be sent when the oil temperature of the cooling oil reaches a certain threshold, for example, when the oil temperature of the cooling oil exceeds 60 ℃, the cooling request of the electric drive assembly is sent to the vehicle controller or the motor controller.
An obtaining module 502, configured to obtain a temperature of cooling oil in an electric drive assembly and a flow demand of the cooling oil;
in some embodiments, after the vehicle controller or the motor controller starts the cooling function, the temperature of the cooling oil in the electric drive assembly and the flow demand of the cooling oil are acquired in real time, wherein the flow demand of the cooling oil can be determined according to the peak power of the motor and the winding temperature.
A first determining module 503 for determining a flow resistance of the cooling oil based on the temperature of the cooling oil and the flow demand of the cooling oil;
in some embodiments, the vehicle controller or the motor controller first obtains a first corresponding relationship, where the first corresponding relationship is a corresponding relationship between a temperature of the cooling oil, a flow demand of the cooling oil, and a flow resistance of the cooling oil; and then calculating the flow resistance of the cooling oil corresponding to the acquired temperature of the cooling oil and the flow demand of the cooling oil by a difference method based on the first corresponding relation.
In a specific embodiment, refer to FIG. 3 and tables one and two; wherein, the curve in fig. 3 is the corresponding relation between the flow demand of the cooling oil and the flow resistance of the cooling oil at different temperatures; in fig. 3, the abscissa is the oil pump flow, and the ordinate is the flow resistance, where the oil pump flow is the flow demand of the cooling oil, and the flow resistance is the flow resistance of the cooling oil. Tables one and two are measurements of the flow demand of the cooling oil and the flow resistance of the cooling oil at different calibration points of the curves of fig. 3 for different temperatures. The graph of fig. 3 can thus be plotted according to table one and table two.
Further, with reference to fig. 3, according to the flow demand of the cooling oil and the temperature of the cooling oil acquired by the vehicle controller or the motor controller, a corresponding flow resistance may be obtained in the corresponding curve in fig. 3. If the flow demand of the cooling oil is just the calibrated value of the oil pump flow in the graph, the flow resistance of the cooling oil can be directly inquired and obtained, and if the flow demand of the cooling oil is between the calibrated values of the oil pump flow in the graph, for example, the flow demand of the cooling oil is between 8L/min and 9/min, the corresponding flow resistance of the cooling oil can be calculated by using a difference method.
In this embodiment, the interval of the temperature curves is 10 ℃, and in order to further improve the accuracy, the interval of the temperature curves may be adaptively reduced, for example, to 5 ℃, 1 ℃ and the like.
A second determination module 504 for determining a rotational speed demand of the oil pump based on a flow demand of the cooling oil and a flow resistance of the cooling oil;
in some embodiments, the vehicle controller or the motor controller obtains a second corresponding relationship, where the second corresponding relationship is a corresponding relationship between a flow demand of the cooling oil, a flow resistance of the cooling oil, and a rotation speed demand of the oil pump; and determines a rotational speed demand of the oil pump based on the second correspondence relationship.
In a specific embodiment, refer to fig. 4; wherein, the curve in fig. 4 is the corresponding relation between the flow demand of the cooling oil and the flow resistance of the cooling oil at different rotational speeds of the oil pump; in fig. 4, the abscissa is the output flow of the oil pump, and the ordinate is the output pressure of the oil pump, where the output flow of the oil pump is the flow demand of the cooling oil, and the output pressure of the oil pump is the flow resistance of the cooling oil. It is thus possible to determine the rotational speed demand of the oil pump by using the second correspondence relation in fig. 4, using the acquired flow demand of the cooling oil and the flow resistance of the cooling oil, and using the difference method.
In fig. 4, the interval of the rotation speed of the oil pump is 10% of the maximum rotation speed of the oil pump, and in order to further improve the accuracy, other intervals may be provided, and the smaller the interval, the higher the accuracy. Wherein the output pressure of the oil pump ranges from 0 to the maximum output pressure of the oil pump.
The control module 505 controls an output flow of the oil pump based on a rotational speed demand of the oil pump.
In some embodiments, after the vehicle control unit or the motor controller determines the rotation speed requirement of the oil pump based on the temperature of the cooling oil and the flow requirement of the cooling oil, a control command is sent to the oil pump to be executed, and the control adjusts the rotation speed of the oil pump to a required value, so that the accurate control of the output flow of the oil pump is realized.
Referring to fig. 6, the present application provides an electronic device 600 comprising: a processor 601 and a memory 602 storing computer program instructions;
the processor 601, when executing the computer program instructions, implements the above-described method for the electric drive assembly to precisely control the output flow of the oil pump.
The present application provides a computer readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the above-described method for an electric drive assembly to precisely control an output flow of an oil pump.
It will be understood that the specific features, operations, and details described herein above with respect to the methods of the present application may also be similarly applied to the devices and systems of the present application, or vice versa. In addition, each step of the method of the present application described above may be performed by a respective component or unit of the apparatus or system of the present application.
It should be understood that the various modules/units of the apparatus of the present application may be implemented in whole or in part by software, hardware, firmware, or a combination thereof. Each module/unit may be embedded in the processor of the computer device in the form of hardware or firmware or independent from the processor, or may be stored in the memory of the computer device in the form of software for being called by the processor to perform the operations of each module/unit. Each module/unit may be implemented as a separate component or module, or two or more modules/units may be implemented as a single component or module. In one embodiment, a computer device is provided that includes a memory having stored thereon computer instructions executable by a processor, the computer instructions, when executed by the processor, instruct the processor to perform the steps of the method of an embodiment of the present application. The computer device may broadly be a server, a terminal, or any other electronic device having the necessary computing and/or processing capabilities. In one embodiment, the computer device may include a processor, memory, a network interface, a communication interface, etc., connected by a system bus. The processor of the computer device may be used to provide the necessary computing, processing and/or control capabilities. The memory of the computer device may include non-volatile storage media and internal memory. An operating system, a computer program, and the like may be stored in or on the non-volatile storage medium. The internal memory may provide an environment for the operating system and the computer programs in the non-volatile storage medium to run. The network interface and the communication interface of the computer device may be used to connect and communicate with an external device through a network. Which computer program, when being executed by a processor, is adapted to carry out the steps of the method of the present application.
The present application may be realized as a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, causes the steps of the method of an embodiment of the present application to be performed. In one embodiment, the computer program is distributed across a plurality of computer devices or processors coupled by a network such that the computer program is stored, accessed, and executed by one or more computer devices or processors in a distributed fashion. A single method step/operation, or two or more method steps/operations, may be performed by a single computer device or processor or by two or more computer devices or processors. One or more method steps/operations may be performed by one or more computer devices or processors, and one or more other method steps/operations may be performed by one or more other computer devices or processors. One or more computer devices or processors may perform a single method step/operation, or perform two or more method steps/operations.
One of ordinary skill in the art will appreciate that the method steps of the present application may be directed to associated hardware, such as a computer device or processor, for completion by a computer program, which may be stored in a non-transitory computer readable storage medium, which when executed causes the steps of the present application to be performed. Any reference herein to memory, storage, databases, or other media may include non-volatile and/or volatile memory, as appropriate. Examples of non-volatile memory include read-only memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), flash memory, magnetic tape, floppy disk, magneto-optical data storage device, hard disk, solid state disk, and the like. Examples of volatile memory include Random Access Memory (RAM), external cache memory, and the like.
The respective technical features described above may be arbitrarily combined. Although not all possible combinations of features are described, any combination of features should be considered to be covered by the present specification as long as there is no contradiction between such combinations.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. A method for accurately controlling the output flow of an oil pump for an electric drive assembly, the method comprising:
receiving a refrigeration request of an electric drive assembly;
acquiring the temperature of cooling oil in the electric drive assembly and the flow demand of the cooling oil;
determining a flow resistance of the cooling oil based on the temperature of the cooling oil and a flow demand of the cooling oil;
determining a rotational speed demand of an oil pump based on a flow demand of the cooling oil and a flow resistance of the cooling oil;
controlling an output flow rate of the oil pump based on a rotational speed demand of the oil pump.
2. The method of claim 1, wherein the determining the flow resistance of the cooling oil based on the temperature of the cooling oil and the flow demand of the cooling oil comprises:
acquiring a first corresponding relation, wherein the first corresponding relation is a corresponding relation among the temperature of the cooling oil, the flow demand of the cooling oil and the flow resistance of the cooling oil;
determining a flow resistance of the cooling oil based on the first correspondence.
3. The method of claim 2, wherein determining the flow resistance of the cooling oil based on the first correspondence comprises:
and calculating the flow resistance of the cooling oil corresponding to the temperature of the cooling oil and the flow demand of the cooling oil by a difference method.
4. The method of claim 1, wherein the determining a rotational speed demand of the oil pump based on the flow demand of the cooling oil and the flow resistance of the cooling oil comprises:
acquiring a second corresponding relation, wherein the second corresponding relation is the corresponding relation among the flow demand of the cooling oil, the flow resistance of the cooling oil and the rotating speed demand of an oil pump;
the rotational speed demand of the oil pump is determined based on the second correspondence.
5. The method of claim 4, wherein determining a speed demand of the oil pump based on the second mapping relationship comprises:
and calculating the rotating speed requirement of the oil pump corresponding to the flow requirement of the cooling oil and the flow resistance of the cooling oil by a difference method.
6. The method of claim 1, wherein the method of determining the flow demand of the cooling oil comprises:
acquiring the peak power and the winding temperature of the motor;
the oil quantity requirement of the cooling oil is determined on the basis of the peak power of the electric machine and the winding temperature.
7. The method of claim 1, wherein the controlling the output flow of the oil pump based on the rotational speed demand of the oil pump comprises:
and controlling the oil pump to execute the rotating speed based on the rotating speed requirement of the oil pump so that the output flow of the oil pump meets the requirement.
8. An apparatus for accurately controlling the output flow of an oil pump for an electric drive assembly, the apparatus comprising:
the receiving module is used for receiving a refrigeration request of the electric drive assembly;
the acquisition module is used for acquiring the temperature of cooling oil in the electric drive assembly and the flow demand of the cooling oil;
a first determination module for determining a flow resistance of the cooling oil based on a temperature of the cooling oil and a flow demand of the cooling oil;
the second determination module is used for determining the rotating speed demand of the oil pump based on the flow demand of the cooling oil and the flow resistance of the cooling oil;
and the control module is used for controlling the output flow of the oil pump based on the rotating speed requirement of the oil pump.
9. An electronic device, characterized in that the electronic device comprises: a processor and a memory storing computer program instructions;
the processor, when executing the computer program instructions, implements a method for precisely controlling the output flow of an oil pump of an electric drive assembly as recited in any one of claims 1-7.
10. A computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement a method for an electric drive assembly to precisely control output flow of an oil pump as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211521985.3A CN115898842A (en) | 2022-11-30 | 2022-11-30 | Method and device for accurately controlling output flow of oil pump by electric drive assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211521985.3A CN115898842A (en) | 2022-11-30 | 2022-11-30 | Method and device for accurately controlling output flow of oil pump by electric drive assembly |
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| Publication Number | Publication Date |
|---|---|
| CN115898842A true CN115898842A (en) | 2023-04-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211521985.3A Pending CN115898842A (en) | 2022-11-30 | 2022-11-30 | Method and device for accurately controlling output flow of oil pump by electric drive assembly |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116760238A (en) * | 2023-08-11 | 2023-09-15 | 大澳电器（江苏）有限公司 | Oil-cooled motor cooling system |
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| KR20190097425A (en) * | 2018-02-12 | 2019-08-21 | 현대자동차주식회사 | Control method of electric oil pump for vehicle |
| CN114337104A (en) * | 2019-07-15 | 2022-04-12 | 华为技术有限公司 | Oil-cooled motor control device and method |
| CN114499051A (en) * | 2022-01-29 | 2022-05-13 | 重庆长安新能源汽车科技有限公司 | Oil-cooled motor cooling system and method for determining target rotating speed of oil pump thereof |
| CN115111513A (en) * | 2022-06-24 | 2022-09-27 | 重庆长安新能源汽车科技有限公司 | Oil cooling loop control method and system of oil cooling motor system and electric automobile |
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| JP2000277349A (en) * | 1999-03-25 | 2000-10-06 | Toshiba Corp | Circulating oil transformer |
| CN104022623A (en) * | 2014-05-29 | 2014-09-03 | 徐州中矿大传动与自动化有限公司 | Three-level inverter water cooling heat dissipation system |
| CN107499113A (en) * | 2017-05-18 | 2017-12-22 | 宝沃汽车（中国）有限公司 | The control method and device of the coolant rate distribution of drive system of electric automobile |
| KR20190097425A (en) * | 2018-02-12 | 2019-08-21 | 현대자동차주식회사 | Control method of electric oil pump for vehicle |
| CN114337104A (en) * | 2019-07-15 | 2022-04-12 | 华为技术有限公司 | Oil-cooled motor control device and method |
| CN114499051A (en) * | 2022-01-29 | 2022-05-13 | 重庆长安新能源汽车科技有限公司 | Oil-cooled motor cooling system and method for determining target rotating speed of oil pump thereof |
| CN115111513A (en) * | 2022-06-24 | 2022-09-27 | 重庆长安新能源汽车科技有限公司 | Oil cooling loop control method and system of oil cooling motor system and electric automobile |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116760238A (en) * | 2023-08-11 | 2023-09-15 | 大澳电器（江苏）有限公司 | Oil-cooled motor cooling system |
| CN116760238B (en) * | 2023-08-11 | 2023-11-07 | 大澳电器（江苏）有限公司 | Oil-cooled motor cooling system |
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