CN114675684B - Cooling lubricating oil liquid system, control method and device thereof, medium and electronic equipment - Google Patents
Cooling lubricating oil liquid system, control method and device thereof, medium and electronic equipment Download PDFInfo
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- CN114675684B CN114675684B CN202210252658.6A CN202210252658A CN114675684B CN 114675684 B CN114675684 B CN 114675684B CN 202210252658 A CN202210252658 A CN 202210252658A CN 114675684 B CN114675684 B CN 114675684B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16N—LUBRICATING
- F16N39/00—Arrangements for conditioning of lubricants in the lubricating system
- F16N39/02—Arrangements for conditioning of lubricants in the lubricating system by cooling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
Abstract
The application relates to the technical field of hybrid electric drive, and discloses a cooling lubricating oil liquid system, a control method and device thereof, a medium and electronic equipment. The cooling lubricating oil system comprises an oil cooler, wherein the oil cooler is communicated with an electric drive assembly system through an oil inlet pipeline and an oil outlet pipeline, and the oil cooler is used for cooling oil; an electronic pump for driving oil to flow between the oil cooler and the electric drive train; the temperature sensor is arranged in the electric drive assembly system and is used for acquiring the system temperature in the electric drive assembly system; and the controller is used for outputting a control current which does not exceed a control upper limit current according to the system temperature so as to control the rotating speed of the electronic pump through the control current. According to the application, an oil temperature sensor is not required to be arranged outside the electric drive assembly system, and the problem of overrun of control current can be solved, so that the production cost of the cooling lubricating oil system can be reduced.
Description
Technical Field
The application relates to the technical field of hybrid electric drive, in particular to a cooling lubricating oil system, a control method and device thereof, a medium and electronic equipment.
Background
At present, in a cooling lubricating oil system for cooling and lubricating an electric drive assembly system, there is a great difference between the oil temperature inside and the oil temperature outside the electric drive assembly system, and the oil temperature inside the electric drive assembly system cannot truly express the oil temperature of an oil inlet of the electric drive assembly system. Because the system only has an internal temperature sensor, according to the internal oil temperature, the oil pump rotating speed instruction higher than the actual demand is very easy to give out, so that the problem of overrun of the control current of the controller is caused, and if the temperature sensor is also arranged outside the electric drive assembly system, the problem of high production cost of the cooling lubricating oil system is brought. Based on the above, how to solve the problem of controlling the current overrun and reduce the production cost of the cooling lubricating oil system is a technical problem to be solved urgently.
Disclosure of Invention
The application aims to provide a cooling lubricating oil system, a control method, a control device, a medium and electronic equipment thereof, which can solve the problem of overrun of control current without arranging an oil temperature sensor outside an electric drive assembly system, thereby reducing the production cost of the cooling lubricating oil system.
Other features and advantages of the application will be apparent from the following detailed description, or may be learned by the practice of the application.
According to a first aspect of an embodiment of the present application, there is provided a cooling lubricating oil system for cooling and lubricating an electric drive assembly system, the cooling lubricating oil system comprising: the oil cooler is communicated with the electric drive assembly system through an oil inlet pipeline and an oil outlet pipeline, and is used for cooling oil; an electronic pump for driving oil flow between the oil cooler and the electric drive assembly; the temperature sensor is arranged in the electric drive assembly system and is used for acquiring the system temperature in the electric drive assembly system; and the controller is used for outputting a control current which does not exceed a control upper limit current according to the system temperature so as to control the rotating speed of the electronic pump through the control current.
In one embodiment of the present application, based on the foregoing, the temperature sensor includes a driving motor temperature sensor, a generator temperature sensor, and an oil temperature sensor; the system temperature comprises a driving motor temperature, a generator temperature and an oil temperature; the driving motor temperature sensor is used for collecting the driving motor temperature, the generator temperature sensor is used for collecting the generator temperature, and the oil temperature sensor is used for collecting the oil temperature.
According to a second aspect of embodiments of the present application, there is provided a control method of a cooling lubricating oil system, the method being performed in a controller in the cooling lubricating oil system according to the first aspect, the method comprising: acquiring the system temperature in the electric drive assembly system, and determining the theoretical rotating speed for the electronic pump according to the system temperature; acquiring a first actual control current of the controller at the theoretical rotating speed, and acquiring an upper limit control current of the controller; calculating the load rate of the controller according to the first actual control current and the upper limit control current, wherein the load rate is used for representing the load degree of the controller and is used as an actual load rate; and determining a second actual control current of the controller according to the actual load rate, and controlling the electronic pump to rotate according to the second actual control current so as to drive oil to flow between the oil cooler and the electric drive assembly system.
In one embodiment of the present application, based on the foregoing solution, the calculating the actual load factor of the controller according to the first actual control current and the upper limit control current includes: the actual load rate of the controller is calculated by the following formula:
Wherein k represents an actual load rate of the controller; i 1 Representing a first actual control current of the controller at the theoretical rotational speed; i 2 Representing the upper limit control current of the controller.
In one embodiment of the present application, based on the foregoing, the determining the second actual control current of the controller according to the actual load factor includes: and if the actual load rate is smaller than 1, determining a first actual control current of the controller at the theoretical rotating speed as the second control current.
In one embodiment of the present application, based on the foregoing, the determining the second actual control current of the controller according to the actual load factor includes: if the actual load rate is greater than or equal to 1, acquiring a preset load rate; and calculating the control current of the controller under the preset load rate as the second actual control current.
In one embodiment of the present application, based on the foregoing, the determining the second actual control current of the controller according to the actual load factor includes: acquiring a preset load rate, and calculating a reference control current of the controller under the preset load rate; determining an actual rotational speed of the electronic pump at the reference control current; if the theoretical rotational speed is less than the actual rotational speed, determining the first actual control current as the second control current; and if the actual rotating speed is smaller than the theoretical rotating speed, determining the reference control current as the second control current.
According to a third aspect of embodiments of the present application, there is provided a control device for a cooling lubricating oil system, the device being provided to a controller in the cooling lubricating oil system according to the first aspect, the device comprising: a first acquisition unit for acquiring a system temperature in the electric drive assembly system and determining a theoretical rotational speed for the electronic pump based on the system temperature; a second acquisition unit configured to acquire a first actual control current of the controller at the theoretical rotational speed, and acquire an upper limit control current of the controller; the calculating unit is used for calculating the load rate of the controller according to the first actual control current and the upper limit control current, and the load rate is used for representing the load degree of the controller as an actual load rate; and the determining unit is used for determining a second actual control current of the controller according to the actual load rate and controlling the electronic pump to rotate according to the second actual control current so as to drive oil to flow between the oil cooler and the electric drive assembly system.
According to a fourth aspect of embodiments of the present application, there is provided a computer readable storage medium having stored thereon a computer program comprising executable instructions which, when executed by a processor, implement a method of controlling a cooling lubricating oil system as described in the above second aspect embodiment.
According to a fifth aspect of an embodiment of the present application, there is provided an electronic apparatus including: one or more processors; and a memory for storing executable instructions of the processor, which when executed by the one or more processors, cause the one or more processors to implement a method of controlling a cooling lubricating oil system as described in the embodiments of the second aspect described above.
In the technical scheme of the embodiment of the application, the controller can output the control current which does not exceed the upper control limit current according to the system temperature, so that the control current which is output by the controller is always at a reasonable level even if the external environment is a low-temperature environment by limiting the control current not to exceed the upper control current limit, and further, the problem of overrun of the control current can be solved without arranging an oil temperature sensor outside the electric drive assembly system, thereby reducing the production cost of a cooling lubricating oil system.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is evident that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:
FIG. 1 is a block diagram of a cooling lubricating oil system according to an embodiment of the present application;
FIG. 2 is a flow chart illustrating a method of controlling a cooling lubricating oil system in accordance with an embodiment of the present application;
FIG. 3 is a block diagram illustrating a control device for a cooling lubricating oil system in accordance with an embodiment of the present application;
FIG. 4 is a schematic diagram of a computer-readable storage medium shown according to an embodiment of the application;
fig. 5 is a schematic diagram showing a system structure of an electronic device according to an embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the application may be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the application.
The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, the functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.
It should be noted that: references herein to "a plurality" means two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., a and/or B may represent: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the objects so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in other sequences than those illustrated or otherwise described.
In the application, the cooling lubricating oil system and the control scheme thereof can be applied to the technical field of control of new energy vehicles. Specifically, the new energy vehicle comprises a multimode hybrid electric drive assembly system which consists of a drive motor, a generator and a shaft tooth system. On the one hand, the multimode hybrid electric drive assembly system needs to be cooled down because of the high temperature generated during operation. On the other hand, since components in the multi-mode hybrid electric drive assembly system may rub against each other during operation, lubrication thereof is required. In order to meet the cooling requirement and the lubrication requirement of the multimode hybrid electric drive assembly system, the application provides a cooling lubricating oil system and a control technical scheme thereof.
The implementation details of the technical scheme of the embodiment of the application are described in detail below:
referring to fig. 1, a block diagram of a cooling lubricating oil system according to an embodiment of the present application is shown.
As shown in fig. 1, the cooling lubricating oil system is used for cooling and lubricating the electric drive assembly system, and the cooling lubricating oil system comprises: the oil cooler 101, the oil cooler 101 and the electric drive assembly system 105 are communicated through an oil inlet pipeline 106 and an oil outlet pipeline 107, and the oil cooler 101 is used for cooling oil; an electronic pump 102 for driving oil flow between the oil cooler 101 and the electric drive train 105; the temperature sensor 103 is arranged in the electric drive assembly system 105 and is used for acquiring the system temperature in the electric drive assembly system 105; and a controller 104, wherein the controller 104 is used for outputting a control current which does not exceed a control upper limit current according to the system temperature so as to control the rotating speed of the electronic pump 102 through the control current.
In one embodiment of the present application, temperature sensor 103 includes a drive motor temperature sensor, a generator temperature sensor, and an oil temperature sensor; the system temperature comprises a driving motor temperature, a generator temperature and an oil temperature; the driving motor temperature sensor is used for collecting the driving motor temperature, the generator temperature sensor is used for collecting the generator temperature, and the oil temperature sensor is used for collecting the oil temperature.
As shown in fig. 1, the whole cooling lubricating oil system comprises an internal part and an external part, wherein the oil cooler 101 is arranged at the external part (i.e. the external environment of the system), and when oil flows into the oil cooler 101 from the inside of the electric drive assembly 105 through the oil outlet pipeline 107, the oil cooler 101 with lower temperature absorbs heat in the oil, so that the temperature of the oil is reduced.
In the present application, the operation of the electronic pump may be controlled by a controller, and in particular, the controller controls the operation of the electronic pump by outputting a control current to the electronic pump. It can be appreciated that the larger the control current, the larger the operating power of the electronic pump, the faster the rotational speed of the electronic pump, and further the faster the oil flow speed.
It should be noted that, in terms of cooling requirement for the electric drive assembly system, when the system temperature (i.e. the temperature of the drive motor, the temperature of the generator, and the temperature of the oil) of the electric drive assembly system is higher, it is indicated that the electric drive assembly system has higher cooling requirement, if the external temperature is higher, the temperature of the oil flowing into the electric drive assembly system through the oil inlet pipeline will also be higher, and at this time, the unit volume of oil cannot absorb more heat in the electric drive assembly system, so that the oil is required to have higher flow speed to accelerate the absorption speed of heat in the electric drive assembly system. If the outside temperature is lower, the temperature of the oil flowing into the electric drive assembly system through the oil inlet pipeline is also lower, and the unit volume of oil can absorb more heat in the electric drive assembly system, so that the oil is not required to have higher flow speed.
In the aspect of the lubrication requirement of the electric drive assembly system, no other requirement is required for the oil flowing speed, namely, the lubrication requirement of the electric drive assembly system can be met as long as the oil is in a flowing state.
It should be noted that the oil has different viscosities at different temperatures, i.e. the lower the oil temperature, the higher the viscosity of the oil, for example, the oil viscosity has small influence at normal temperature and high temperature, but the oil viscosity changes sharply below-10 ℃. This results in greater resistance of the oil at the same flow rate, and it is further understood that at the same rotational speed of the electronic pump, the greater the load of the electronic pump, the greater the control current output by the controller to the electronic pump, if the oil temperature is lower.
In the application, the controller determines the rotating speed required by the electronic pump according to the system temperature of the electric drive assembly system, and if the system temperature is higher, the rotating speed required by the electronic pump is higher, so that the driving oil liquid has higher flow rate, and the absorption of the system temperature of the electric drive assembly system is accelerated.
However, the present inventors have found that determining a control current corresponding to a system temperature according to the system temperature of the electric drive assembly system is only applicable to the case where the external environment is a high temperature environment, and is not applicable to the case where the external environment is a low temperature environment.
If the external environment is a high-temperature environment, the temperature of the oil flowing into the electric drive assembly system through the oil inlet pipeline is also higher, at the moment, the controller determines the higher rotating speed of the electronic pump according to the higher system temperature, and because the oil temperature is higher, the viscosity of the oil is smaller, and even if the rotating speed required by the electronic pump is higher, the load of the electronic pump is smaller, so that the controller does not need to output control current higher than the upper limit of the self control current.
If the external environment is a low-temperature environment, the temperature of oil flowing into the electric drive assembly system through the oil inlet pipeline is also lower, at the moment, the controller determines the higher rotating speed of the electronic pump according to the higher system temperature, and the electronic pump is higher in viscosity due to the lower oil temperature, so that the load of the electronic pump is higher under the condition that the rotating speed required by the electronic pump is higher, the controller can possibly output control current higher than the upper limit of self control current, and under the condition that the control current output by the controller is higher than the upper limit of the self control current, the controller is extremely easy to cause current overrun to trigger the power-off protection of the controller, so that the cooling lubricating oil system stops working, the electric drive assembly system is damaged, and further, the vehicle is triggered to give an alarm to stop working.
Based on the finding, the inventor provides that the controller can output the control current which does not exceed the upper control limit current according to the system temperature, so that the control current which is output by the controller is always at a reasonable level even if the external environment is a low-temperature environment by limiting the control current not to exceed the upper control current limit, and further, the problem of overrun of the control current can be solved without arranging an oil temperature sensor outside the electric drive assembly system, so that the production cost of the cooling lubricating oil system can be reduced.
According to a second aspect of the embodiments of the present application, a control method of a cooling lubricating oil system is also provided, wherein the control method of the cooling lubricating oil system may be implemented in the controller of the cooling lubricating oil system according to the first aspect.
Fig. 2 is a flowchart of a control method of the cooling lubricating oil system according to an embodiment of the present application, where the control method of the cooling lubricating oil system at least includes steps 210 to 270, and is described in detail as follows:
in step 210, a system temperature within the electric drive train is obtained and a theoretical rotational speed for the electronic pump is determined based on the system temperature.
In the present application, the system temperature in the electric drive assembly system may include a drive motor temperature, a generator temperature, and an oil temperature, and further, the theoretical rotational speed for the electronic pump may be determined according to the system temperature, and the theoretical rotational speed for the electronic pump may be determined according to the drive motor temperature, the generator temperature, and the oil temperature.
It should be noted that, there is a correlation between the system temperature and the theoretical rotational speed of the electronic pump, that is, the higher the system temperature, the higher the corresponding theoretical rotational speed, and the theoretical rotational speed corresponds to the flow speed of the oil in the electric drive assembly system, and in the case that the external environment is a high-temperature environment, the higher the system temperature, the higher the theoretical rotational speed of the electronic pump can make the flow speed of the oil in the electric drive assembly system higher, so as to accelerate the absorption speed of the oil to the heat in the electric drive assembly system.
It should be further noted that, in the present application, the theoretical rotational speed determined in step 210 is not the final rotational speed of the electronic pump operation, and it is also necessary to determine the external actual temperature environment (i.e. the high temperature environment and the low temperature environment) by the following steps, and determine the final control current output by the controller to the electronic pump and the corresponding final rotational speed of the electronic pump operation according to the external actual temperature environment.
With continued reference to FIG. 2, in step 230, a first actual control current of the controller at the theoretical rotational speed is obtained, and an upper limit control current of the controller is obtained.
In the application, the control current output by the controller to the electronic pump is related to the temperature of oil (namely the viscosity of the oil) besides the rotating speed of the electronic pump, namely the lower the temperature of the oil is, the higher the viscosity of the oil is, the higher the resistance of the oil at the same flowing speed is, and the higher the load of the electronic pump is, and the control current output by the controller to the electronic pump is. If the temperature of the oil is higher, the viscosity of the oil is lower, the resistance of the oil at the same flow speed is smaller, the load of the electronic pump is smaller, and the control current output to the electronic pump by the controller is smaller.
In the application, the upper limit control current of the controller refers to the maximum current which can be borne by the controller, and it can be understood that if the control current output by the controller exceeds the upper limit control current of the controller, the current overrun can trigger the power-off protection of the controller, so that the cooling lubricating oil liquid system stops working, the electric drive assembly system is damaged, and the vehicle alarm is triggered to stop working of the vehicle.
By acquiring the first actual control current of the controller at the theoretical rotation speed and the upper limit control current of the controller, the external temperature environment can be reversely pushed in the subsequent steps, and therefore the temperature and the viscosity degree of the oil liquid can be determined.
In step 250, a load factor of the controller is calculated according to the first actual control current and the upper limit control current, and the load factor is used as an actual load factor and is used for representing the load degree of the controller.
In one embodiment of step 250, the calculating the actual load factor of the controller according to the first actual control current and the upper limit control current includes: the actual load factor of the controller is calculated by the following formula (1):
wherein k represents an actual load rate of the controller; i 1 Representing a first actual control current of the controller at the theoretical rotational speed; i 2 Representing the upper limit control current of the controller.
In this embodiment, the load factor k may essentially represent the thermal load level of the controller.
In another embodiment of step 250, the calculating the actual load factor of the controller according to the first actual control current and the upper limit control current includes: the actual load factor of the controller is calculated by the following formula (2):
Wherein k represents an actual load rate of the controller; i 1 Representing a first actual control current of the controller at the theoretical rotational speed; i 2 Representing the upper limit control current of the controller.
In step 270, a second actual control current of the controller is determined according to the actual load factor, and the electronic pump is controlled to rotate according to the second actual control current, so as to drive oil to flow between the oil cooler and the electric drive assembly system.
In one embodiment of step 270, the determining the second actual control current of the controller according to the actual load factor may be performed as follows:
and if the actual load rate is smaller than 1, determining a first actual control current of the controller at the theoretical rotating speed as the second control current.
It can be understood that when the actual load rate is less than 1, it indirectly indicates that the external environment temperature is higher, the oil viscosity is lower, the load of the electronic pump is smaller, and the first actual control current of the controller at the theoretical rotation speed does not exceed the upper limit control current of the controller, so that the first actual control current of the controller at the theoretical rotation speed can be directly determined as the second control current, and the electronic pump is controlled to rotate according to the second actual control current, so as to drive the oil to flow between the oil cooler and the electric drive assembly system.
Further, in this embodiment, the determining the second actual control current of the controller according to the actual load factor may further perform steps 271 to 272 as follows:
in step 271, if the actual load factor is greater than or equal to 1, a preset load factor is obtained.
Step 272, calculating a control current of the controller at the preset load rate as the second actual control current.
It can be understood that when the actual load ratio is greater than or equal to 1, it indirectly indicates that the external environment temperature is lower, the oil viscosity is lower, the load of the electronic pump is larger, and the first actual control current of the controller at the theoretical rotation speed exceeds the upper limit control current of the controller, so that the first actual control current of the controller at the theoretical rotation speed cannot be directly determined as the second control current.
In this case, since the temperature of the outside is low, the temperature of the oil flowing into the electric drive assembly system through the oil inlet pipeline is also low, and the unit volume of oil can absorb more heat in the electric drive assembly system, so that the oil is not required to have a higher flow speed. Therefore, the preset load rate can be obtained, the control current of the controller under the preset load rate is used as the second actual control current, and the electronic pump is controlled to rotate according to the second actual control current so as to drive oil to flow between the oil cooler and the electric drive assembly system.
In this embodiment, a preset load factor of 0.8 may be selected, and a preset load factor of 0.85 may also be selected, which should be noted that the specific numerical value of the preset load factor is not limited in the present application.
In this embodiment, the control current of the controller at the preset load rate may be calculated according to the above formula (1) or formula (2).
In another embodiment of step 270, the determining the second actual control current of the controller according to the actual load factor may further be performed according to steps 273 to 276 as follows:
step 273, obtaining a preset load rate, and calculating a reference control current of the controller under the preset load rate.
Step 274 determines an actual rotational speed of the electronic pump at the reference control current.
And step 275, determining the first actual control current as the second control current if the theoretical rotational speed is less than the actual rotational speed.
If the actual rotational speed is less than the theoretical rotational speed, the reference control current is determined to be the second control current, step 276.
It can be understood that if the theoretical rotation speed is smaller than the actual rotation speed, it indirectly indicates that the external environment temperature is higher, the oil viscosity is lower, the load of the electronic pump is smaller, and the first actual control current of the controller at the theoretical rotation speed does not exceed the upper limit control current of the controller, so that the first actual control current of the controller at the theoretical rotation speed can be directly determined as the second control current.
If the actual rotation speed is smaller than the theoretical rotation speed, the situation that the external environment temperature is lower, the oil viscosity is lower, the load of the electronic pump is larger is indirectly indicated, and the first actual control current of the controller at the theoretical rotation speed exceeds the upper limit control current of the controller, so that the first actual control current of the controller at the theoretical rotation speed cannot be directly determined to be the second control current, and the reference control current of the controller at the preset load rate is required to be used as the second actual control current.
In summary, in the technical solution of the embodiment of the present application, since the controller can output the control current not exceeding the control upper limit current according to the system temperature and the load factor of the controller, by limiting the control current not exceeding the control upper limit current, the control current output by the controller is always at a reasonable level even if the external environment is a low temperature environment, and further, the problem of controlling the current to exceed the limit can be solved without arranging an oil temperature sensor outside the electric drive assembly system, thereby reducing the production cost of the cooling lubricating oil system.
The following describes embodiments of the apparatus of the present application that may be used to implement the control method of the cooling lubricating oil system of the above-described embodiments of the present application. For details not disclosed in the embodiments of the apparatus of the present application, please refer to the embodiments of the control method of the cooling lubricating oil system of the present application.
FIG. 3 is a block diagram illustrating a control device for a cooling lubricating oil system in accordance with an embodiment of the present application.
Referring to fig. 3, a control apparatus 300 of a cooling and lubricating oil system according to an embodiment of the present application, the apparatus 300 is provided to a controller in the cooling and lubricating oil system according to the first aspect, the apparatus comprising: a first acquisition unit 301, a second acquisition unit 302, a calculation unit 303, and a determination unit 304.
Wherein a first acquisition unit 301 is used for acquiring the system temperature in the electric drive assembly system and determining the theoretical rotation speed for the electronic pump according to the system temperature; a second obtaining unit 302, configured to obtain a first actual control current of the controller at the theoretical rotational speed, and obtain an upper limit control current of the controller; a calculating unit 303, configured to calculate, as an actual load factor, a load factor of the controller according to the first actual control current and the upper limit control current, where the load factor is used to characterize a load degree of the controller; and the determining unit 304 is used for determining a second actual control current of the controller according to the actual load rate and controlling the electronic pump to rotate according to the second actual control current so as to drive oil to flow between the oil cooler and the electric drive assembly system.
As another aspect, the present application also provides a computer-readable storage medium having stored thereon a program product capable of implementing the control method of the cooling lubricating oil system described in the present specification. In some possible embodiments, the various aspects of the application may also be implemented in the form of a program product comprising program code for causing a terminal device to carry out the steps according to the various exemplary embodiments of the application as described in the "exemplary methods" section of this specification, when said program product is run on the terminal device.
Referring to fig. 4, a program product 400 for implementing the above-described method according to an embodiment of the present application is described, which may employ a portable compact disc read only memory (CD-ROM) and include program code, and may be run on a terminal device, such as a personal computer. However, the program product of the present application is not limited thereto, and in this document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: an electrical connection having one or more wires, a portable disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The computer readable signal medium may include a data signal propagated in baseband or as part of a carrier wave with readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Program code for carrying out operations of the present application may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device, partly on a remote computing device, or entirely on the remote computing device or server. In the case of remote computing devices, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., connected via the Internet using an Internet service provider).
On the other hand, the application also provides electronic equipment capable of realizing the control method of the cooling lubricating oil system.
Those skilled in the art will appreciate that the various aspects of the application may be implemented as a system, method, or program product. Accordingly, aspects of the application may be embodied in the following forms, namely: an entirely hardware embodiment, an entirely software embodiment (including firmware, micro-code, etc.) or an embodiment combining hardware and software aspects may be referred to herein as a "circuit," module "or" system.
An electronic device 500 according to such an embodiment of the application is described below with reference to fig. 5. The electronic device 500 shown in fig. 5 is merely an example, and should not be construed as limiting the functionality and scope of use of embodiments of the present application.
As shown in fig. 5, the electronic device 500 is embodied in the form of a general purpose computing device. The components of electronic device 500 may include, but are not limited to: the at least one processing unit 510, the at least one memory unit 520, and a bus 530 connecting the various system components, including the memory unit 520 and the processing unit 510.
Wherein the storage unit stores program code that is executable by the processing unit 510 such that the processing unit 510 performs steps according to various exemplary embodiments of the present application described in the above-mentioned "example methods" section of the present specification.
The storage unit 520 may include readable media in the form of volatile storage units, such as Random Access Memory (RAM) 521 and/or cache memory 522, and may further include Read Only Memory (ROM) 523.
The storage unit 520 may also include a program/utility 524 having a set (at least one) of program modules 525, such program modules 525 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of which may include an implementation of a network environment.
Bus 530 may be one or more of several types of bus structures including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.
The electronic device 500 may also communicate with one or more external devices 1200 (e.g., keyboard, pointing device, bluetooth device, etc.), one or more devices that enable a user to interact with the electronic device 500, and/or any device (e.g., router, modem, etc.) that enables the electronic device 500 to communicate with one or more other computing devices. Such communication may occur through an input/output (I/O) interface 550. Also, electronic device 500 may communicate with one or more networks such as a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the Internet, through network adapter 560. As shown, network adapter 560 communicates with other modules of electronic device 500 over bus 530. It should be appreciated that although not shown, other hardware and/or software modules may be used in connection with electronic device 500, including, but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, data backup storage systems, and the like.
From the above description of embodiments, those skilled in the art will readily appreciate that the example embodiments described herein may be implemented in software, or may be implemented in software in combination with the necessary hardware. Thus, the technical solution according to the embodiments of the present application may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (may be a CD-ROM, a U-disk, a mobile hard disk, etc.) or on a network, and includes several instructions to cause a computing device (may be a personal computer, a server, a terminal device, or a network device, etc.) to perform the method according to the embodiments of the present application.
Furthermore, the above-described drawings are only schematic illustrations of processes included in the method according to the exemplary embodiment of the present application, and are not intended to be limiting. It will be readily appreciated that the processes shown in the above figures do not indicate or limit the temporal order of these processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, for example, among a plurality of modules.
It is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A cooling lubricating oil system for cooling and lubricating an electric drive assembly, the cooling lubricating oil system comprising:
the oil cooler is communicated with the electric drive assembly system through an oil inlet pipeline and an oil outlet pipeline, and is used for cooling oil;
an electronic pump for driving oil flow between the oil cooler and the electric drive assembly;
the temperature sensor is arranged in the electric drive assembly system and is used for acquiring the system temperature in the electric drive assembly system;
a controller for outputting a control current not exceeding a control upper limit current according to the system temperature to control a rotation speed of the electronic pump by the control current;
the controller is also used for acquiring the system temperature in the electric drive assembly system and determining the theoretical rotating speed for the electronic pump according to the system temperature; acquiring a first actual control current of the controller at the theoretical rotating speed, and acquiring an upper limit control current of the controller; calculating the load rate of the controller according to the first actual control current and the upper limit control current, wherein the load rate is used for representing the load degree of the controller and is used as an actual load rate; and determining a second actual control current of the controller according to the actual load rate, and controlling the electronic pump to rotate according to the second actual control current so as to drive oil to flow between the oil cooler and the electric drive assembly system.
2. A cooling lubricating oil system for cooling and lubricating an electric drive assembly, the cooling lubricating oil system comprising:
the oil cooler is communicated with the electric drive assembly system through an oil inlet pipeline and an oil outlet pipeline, and is used for cooling oil;
an electronic pump for driving oil flow between the oil cooler and the electric drive assembly;
the temperature sensor is arranged in the electric drive assembly system and is used for acquiring the system temperature in the electric drive assembly system;
a controller for outputting a control current not exceeding a control upper limit current according to the system temperature to control a rotation speed of the electronic pump by the control current;
the controller is also used for acquiring the system temperature in the electric drive assembly system and determining the theoretical rotating speed for the electronic pump according to the system temperature; acquiring a first actual control current of the controller at the theoretical rotating speed; acquiring a preset load rate, and calculating a reference control current of the controller under the preset load rate; determining an actual rotational speed of the electronic pump at the reference control current; if the theoretical rotating speed is smaller than the actual rotating speed, determining the first actual control current as a second actual control current, and controlling the electronic pump to rotate according to the second actual control current so as to drive oil to flow between the oil cooler and the electric drive assembly system; and if the actual rotating speed is smaller than the theoretical rotating speed, determining the reference control current as the second actual control current.
3. The cooling lubricating oil system of claim 1 or 2, wherein the temperature sensor comprises a drive motor temperature sensor, a generator temperature sensor, and an oil temperature sensor; the system temperature comprises a driving motor temperature, a generator temperature and an oil temperature; the driving motor temperature sensor is used for collecting the driving motor temperature, the generator temperature sensor is used for collecting the generator temperature, and the oil temperature sensor is used for collecting the oil temperature.
4. A method of controlling a cooling lubricating oil system, the method being performed by a controller in the cooling lubricating oil system of claim 1, the method comprising:
acquiring the system temperature in the electric drive assembly system, and determining the theoretical rotating speed for the electronic pump according to the system temperature;
acquiring a first actual control current of the controller at the theoretical rotating speed, and acquiring an upper limit control current of the controller;
calculating the load rate of the controller according to the first actual control current and the upper limit control current, wherein the load rate is used for representing the load degree of the controller and is used as an actual load rate;
And determining a second actual control current of the controller according to the actual load rate, and controlling the electronic pump to rotate according to the second actual control current so as to drive oil to flow between the oil cooler and the electric drive assembly system.
5. The method of claim 4, wherein calculating an actual load rate of the controller based on the first actual control current and the upper limit control current comprises: the actual load rate of the controller is calculated by the following formula:
wherein k represents an actual load rate of the controller; i 1 Representation houseA first actual control current of the controller at the theoretical rotational speed; i 2 Representing the upper limit control current of the controller.
6. The method of claim 4, wherein said determining a second actual control current of said controller based on said actual load factor comprises:
and if the actual load rate is smaller than 1, determining a first actual control current of the controller at the theoretical rotating speed as the second actual control current.
7. The method of claim 4, wherein said determining a second actual control current of said controller based on said actual load factor comprises:
If the actual load rate is greater than or equal to 1, acquiring a preset load rate;
and calculating the control current of the controller under the preset load rate as the second actual control current.
8. A control device for a cooling and lubricating oil system, said device being provided to a controller in a cooling and lubricating oil system according to claim 1, said device comprising:
a first acquisition unit for acquiring a system temperature in the electric drive assembly system and determining a theoretical rotational speed for the electronic pump based on the system temperature;
a second acquisition unit configured to acquire a first actual control current of the controller at the theoretical rotational speed, and acquire an upper limit control current of the controller;
the calculating unit is used for calculating the load rate of the controller according to the first actual control current and the upper limit control current, and the load rate is used for representing the load degree of the controller as an actual load rate;
and the determining unit is used for determining a second actual control current of the controller according to the actual load rate and controlling the electronic pump to rotate according to the second actual control current so as to drive oil to flow between the oil cooler and the electric drive assembly system.
9. A computer readable storage medium having stored therein at least one program code loaded and executed by a processor to implement operations performed by a control method of a cooling lubricating oil system as claimed in any one of claims 4 to 7.
10. An electronic device comprising one or more processors and one or more memories, the one or more memories having stored therein at least one program code loaded and executed by the one or more processors to implement the operations performed by the control method of the cooling lubricating oil system of any of claims 4 to 7.
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| CN202210252658.6A CN114675684B (en) | 2022-03-10 | 2022-03-10 | Cooling lubricating oil liquid system, control method and device thereof, medium and electronic equipment |
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