CN115033988A - Power assembly temperature estimation method and device, vehicle control unit and medium - Google Patents
Power assembly temperature estimation method and device, vehicle control unit and medium Download PDFInfo
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- CN115033988A CN115033988A CN202210614023.6A CN202210614023A CN115033988A CN 115033988 A CN115033988 A CN 115033988A CN 202210614023 A CN202210614023 A CN 202210614023A CN 115033988 A CN115033988 A CN 115033988A
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Abstract
The invention discloses a power assembly temperature estimation method and device, a vehicle control unit and a medium. The method comprises the following steps: establishing a thermal management system simulation model; the thermal management system simulation model comprises a power assembly simulation model and a thermal management component simulation model; determining the power assembly simulation temperature according to the total power of the power assembly, the input power of the thermal management component and the simulation parameters determined by the thermal management system simulation model, and determining the power assembly simulation temperature precision according to the power assembly simulation temperature and the actual power assembly temperature; acquiring a power assembly measured temperature in a real thermal management system by a temperature sensor in real time, and determining the power assembly measured temperature precision according to the power assembly measured temperature and the power assembly actual temperature; and determining the optimal temperature of the power assembly according to the power assembly simulation temperature, the power assembly simulation temperature precision, the power assembly measurement temperature and the power assembly measurement temperature precision. This scheme has realized the accurate measurement of power assembly temperature.
Description
Technical Field
The embodiment of the invention relates to a temperature estimation technology, in particular to a power assembly temperature estimation method, a power assembly temperature estimation device, a vehicle control unit and a medium.
Background
The heat management system of the pure electric vehicle of the new energy automobile is characterized in that all power assemblies are connected through cooling medium pipelines, and heat exchange is carried out on all the power assemblies and the external environment through cooling media, so that all the power assemblies work in the optimal temperature range. Specifically, the vehicle control unit acquires the temperature of each power assembly through a temperature sensor, controls a water pump and a fan of the heat management system to work, achieves heat exchange, and enables each assembly to achieve heat balance. The collection of the temperature of each power assembly and the temperature of the cooling medium is a key factor for realizing the thermal management of the power system.
In the prior art, temperature sensors can acquire temperature information, but different sensors have different accuracies and are greatly influenced by price factors. In order to reduce the cost, if a temperature sensor with lower precision is adopted, the control effect is not ideal. If the temperature detected by the temperature sensor is higher, the temperature judgment threshold of the thermal management system is controlled to be higher, so that the power assembly can work at an improper temperature for a long time, and the service life is shortened. If the temperature detected by the temperature sensor is low, the temperature judgment threshold of the control thermal management system is low, so that the energy consumption of the vehicle is increased, and the driving range is reduced.
Disclosure of Invention
The invention discloses a power assembly temperature estimation method, a power assembly temperature estimation device, a vehicle control unit and a medium, which realize accurate measurement of the power assembly temperature and further realize reliable control of a thermal management system.
In a first aspect, an embodiment of the present invention provides a method for estimating a temperature of a powertrain, where the method includes:
establishing a thermal management system simulation model; the thermal management system simulation model comprises a power assembly simulation model and a thermal management component simulation model;
determining the power assembly simulation temperature according to the total heating power of the power assembly, the input power of the thermal management component and the simulation parameters determined by the thermal management system simulation model, and determining the power assembly simulation temperature precision according to the power assembly simulation temperature and the actual power assembly temperature;
acquiring a power assembly measured temperature in a real thermal management system by a temperature sensor in real time, and determining the power assembly measured temperature precision according to the power assembly measured temperature and the power assembly actual temperature;
and determining the optimal temperature of the power assembly according to the power assembly simulation temperature, the power assembly simulation temperature precision, the power assembly measured temperature and the power assembly measured temperature precision.
Optionally, determining the optimal temperature of the power assembly according to the power assembly simulation temperature, the power assembly simulation temperature precision, the power assembly measurement temperature and the power assembly measurement temperature precision includes:
determining the power assembly correction simulation temperature according to the power assembly simulation temperature and the power assembly simulation temperature precision;
determining the power assembly correction measurement temperature according to the power assembly measurement temperature and the power assembly measurement temperature precision;
and determining the optimal temperature of the power assembly according to the corrected simulation temperature of the power assembly and the corrected measured temperature of the power assembly.
Optionally, the method further includes: detecting whether the temperature sensor fails;
and when the temperature sensor fails, adjusting the precision of the temperature measured by the power assembly.
Optionally, the method further includes:
determining whether the variation of the measured temperature of the power assembly is greater than a preset variation within a preset time;
and if the variation of the measured temperature of the power assembly is greater than the preset variation, adjusting the simulation temperature precision of the power assembly.
Optionally, the thermal management system simulation model includes a first thermal management system simulation model;
the first thermal management system simulation model comprises a first powertrain simulation model and a first thermal management component model; the first power assembly simulation model comprises a power motor, a direct current converter and a vehicle-mounted charger; the first heat management assembly model comprises a fan, a water pump and a heat exchange device; the power motor, the direct current converter, the vehicle-mounted charger, the water pump and the heat exchange device form a circulation loop through a cooling medium pipeline, and the fan is coupled with the heat exchange device.
Optionally, the thermal management system simulation model includes a second thermal management system simulation model;
the second thermal management system simulation model comprises a second powertrain simulation model and a second thermal management component model; the second power assembly simulation model comprises a power battery; the second heat management component model comprises an electric heating device, an electric cooling device and a water pump; the power battery, the electric heating device, the electric cooling device and the water pump form a circulation loop through a cooling medium pipeline.
In a second aspect, an embodiment of the present invention provides a powertrain temperature estimation apparatus, including:
the simulation model establishing module is used for establishing a thermal management system simulation model based on the power assembly test working condition data; the thermal management system simulation model comprises various power assembly simulation models and thermal management component simulation models;
the simulation temperature determining module is used for determining the simulation temperature of the power assembly according to the total heating power of each power assembly, the input power of the thermal management component and the simulation parameters determined by the thermal management system simulation model, and determining the precision of the simulation temperature of the power assembly according to the simulation temperature of the power assembly and the actual temperature of the power assembly;
the measurement temperature determining module is used for acquiring the temperature measured by each power assembly in the real thermal management system collected by the temperature sensor in real time and determining the precision of the measurement temperature of the power assembly according to the measurement temperature of the power assembly and the actual temperature of the power assembly;
and the optimal temperature determination module is used for determining the optimal temperature of the power assembly according to the power assembly simulation temperature, the power assembly simulation temperature precision, the power assembly measured temperature and the power assembly measured temperature precision.
In a third aspect, an embodiment of the present invention provides a vehicle control unit, where the vehicle control unit includes:
one or more processors;
a storage device for storing one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the powertrain temperature estimation method of the first aspect.
In a fourth aspect, embodiments of the present invention provide a storage medium containing computer-executable instructions for performing the powertrain temperature estimation method of the first aspect when executed by a computer processor.
According to the embodiment of the invention, a thermal management system simulation model is established; the thermal management system simulation model comprises a power assembly simulation model and a thermal management component simulation model; then determining the power assembly simulation temperature according to the total power of the power assembly, the input power of the thermal management component and the simulation parameters determined by the thermal management system simulation model, and determining the precision of the power assembly simulation temperature according to the power assembly simulation temperature and the actual power assembly temperature; then acquiring a power assembly measured temperature in a real thermal management system acquired by a temperature sensor in real time, and determining the power assembly measured temperature precision according to the power assembly measured temperature and the power assembly actual temperature; and finally, determining the optimal temperature of the power assembly according to the power assembly simulation temperature, the power assembly simulation temperature precision, the power assembly measurement temperature and the power assembly measurement temperature precision. According to the scheme, the temperature of the power assembly is accurately measured, and therefore the heat management system is reliably controlled.
Drawings
FIG. 1 is a schematic flow chart diagram of a powertrain temperature estimation method provided in accordance with an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a simulation model of a thermal management system according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart diagram of another powertrain temperature estimation method provided by an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a powertrain temperature estimation device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a vehicle control unit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the features relevant to the present invention are shown in the drawings.
Fig. 1 is a flowchart of a method for estimating a temperature of a powertrain according to an embodiment of the present invention, where the embodiment is applicable to a temperature estimation situation of each powertrain, and the method may be executed by a powertrain temperature estimation device, as shown in fig. 1, and specifically includes the following steps:
s110, establishing a thermal management system simulation model; the thermal management system simulation model comprises a power assembly simulation model and a thermal management component simulation model.
Fig. 2 is a schematic structural diagram of a thermal management system simulation model according to an embodiment of the present invention, and as shown in fig. 2, the thermal management system simulation model includes a first thermal management system simulation model 10; the first thermal management system simulation model 10 comprises a first powertrain simulation model and a first thermal management component model; the first power assembly simulation model comprises a power motor 11, a direct current converter 12 and a vehicle-mounted charger 13; the first thermal management component model comprises a fan 31, a water pump 21 and a heat exchange device 41; the power motor 11, the direct current converter 12, the vehicle-mounted charger 13, the water pump 21 and the heat exchange device 41 form a circulation loop through a cooling medium pipeline 42. The water pump 21 is a device for driving the cooling medium to flow in the cooling medium pipeline, and can control the flow rate of the cooling medium so as to change the heat exchange amount of the cooling medium with each power battery and the heat exchange device; the fan 31 is a device that can accelerate the heat exchange of the heat exchange device 41 with the atmosphere; the coolant line 42 is a device for connecting each power train and the heat exchanger 41; the first thermal management system simulation model is established by fitting the optimal parameters of the thermal management system which can cover all working conditions based on the performance test data of all thermal management working conditions, so that the thermal management system simulation model is established. All heat management working conditions of the first heat management system simulation model comprise a power motor cooling working condition, a direct current converter cooling working condition and a vehicle-mounted charger cooling working condition; illustratively, the vehicle is controlled to run by the vehicle controller in the power motor cooling working condition process, the vehicle controller collects electric power of the power motor, collects temperature signals of a power motor temperature sensor, judges the thermal state of the power motor, and controls a fan and a water pump to work at a temperature threshold set by a thermal management control strategy; the power motor temperature sensor acquires a temperature signal of the cooled power motor, so that the optimal parameter of the cooling working condition of the power motor can be determined according to the variation of the temperature signal of the power motor, the electric power of the motor and the heat dissipation power of the fan and the water pump; and determining that respective optimal parameters are similar under the cooling working condition of the direct current converter and the cooling working condition of the vehicle-mounted charger.
Optionally, referring to fig. 2, the thermal management system simulation model includes a second thermal management system simulation model 20;
the second thermal management system simulation model 20 comprises a second powertrain simulation model and a second thermal management component model; the second powertrain simulation model includes a power cell 14; the second heat management component model comprises an electric heating device 32, an electric cooling device 33 and a water pump 21; the power battery 14, the electric heating device 32, the electric cooling device 33 and the water pump 21 form a circulation loop through a cooling medium pipeline 42. The electric heating device and the electric cooling device are devices for providing an electric heating source and an electric cooling source for the power battery. The second thermal management system simulation model is established by fitting the optimal parameters of the thermal management system capable of covering all working conditions based on the performance test data of all the thermal management working conditions, so that the second thermal management system simulation model is established. All the heat management working conditions of the second heat management system simulation model comprise a power battery cooling working condition, a power battery heating working condition and a power battery self-circulation process; illustratively, in the power battery cooling working condition process, the whole vehicle controller collects electric power of a power battery, collects temperature signals of a power battery temperature sensor, judges the thermal state of the power battery, and controls an electric cooling device to work at a temperature threshold set by a thermal management control strategy; the power battery temperature sensor collects the cooled temperature signal, so that the optimal parameter of the cooling working condition of the power battery can be determined according to the variation of the temperature signal of the power battery, the electric power of the motor battery and the heat dissipation power of the electric cooling device; and determining that respective optimal parameters are similar under the heating working condition of the power battery and the self-circulation working condition of the power battery. It is understood that the simulation model of the thermal management system in the entire vehicle further includes a circulation loop of other power assemblies, for example, a circulation loop may be formed by a power motor, an electric heating device and an electric cooling device, and the specific configuration of the thermal management simulation model is not particularly limited herein.
And S120, determining the simulation temperature of the power assembly according to the total heating power of the power assembly, the input power of the thermal management component and the simulation parameters determined by the thermal management system simulation model, and determining the precision of the simulation temperature of the power assembly according to the simulation temperature of the power assembly and the actual temperature of the power assembly.
The simulation parameters comprise mass parameters and specific heat capacity parameters of the power assembly; in one circulation loop, the input power of the heat management component is related to factors such as the heat dissipation power of a fan and a heat exchange device, the flow rate of a water pump and the like, in the other circulation loop, the input power of the heat management component is related to factors such as the heat dissipation power of an electric cooling device, the heat increasing power of an electric heating device, the flow rate of the water pump and the like, and the input power of the heat management component can be converted into the heat dissipation power of a power assembly or the heating power of the power assembly; therefore, the simulation temperature of the power assembly is determined in real time according to the total heating power of the power assembly, the input power of the thermal management component and the simulation parameters which are acquired in real time.
The precision of the power assembly simulation temperature is the deviation degree of the power assembly simulation temperature from the actual power assembly temperature, wherein the actual power assembly temperature is a theoretical temperature value calculated by the power assembly under a specific working condition according to a specific algorithm; preferably, the accuracy of the simulated temperature of the powertrain can be obtained by calculating the variance of the difference between the simulated temperature of the powertrain and the actual temperature of the powertrain, i.e., the accuracy of the simulated temperature of the powertrain can be represented in the form of variance.
S130, acquiring the temperature measured by each power assembly in the real thermal management system through the temperature sensor, and determining the precision of the measured temperature of the power assembly according to the measured temperature of the power assembly and the actual temperature of the power assembly.
Preferably, the accuracy of the measured temperature of the power assembly can be obtained by calculating the variance of the difference between the measured temperature of the plurality of power assemblies and the actual temperature of the power assembly, namely the accuracy of the measured temperature of the power assembly can be represented in the form of variance.
And S140, determining the optimal temperature of the power assembly according to the power assembly simulation temperature, the power assembly simulation temperature precision, the power assembly measurement temperature and the power assembly measurement temperature precision.
The simulation temperature signal and the measurement temperature signal are fused, so that a more accurate temperature signal can be obtained. Specifically, determining a power assembly correction simulation temperature according to the power assembly simulation temperature and the power assembly simulation temperature precision; determining a power assembly correction measurement temperature according to the power assembly measurement temperature and the power assembly measurement temperature precision; the optimal temperature of the power assembly is determined according to the corrected simulation temperature of the power assembly and the corrected measurement temperature of the power assembly, so that the accurate measurement of the temperature of the power assembly is realized, and the reliable control of the heat management system is realized.
Optionally, based on the foregoing embodiment, further optimizing, fig. 3 is a flowchart of a method for estimating a temperature of a powertrain according to an embodiment of the present invention, as shown in fig. 3, where the method includes the following steps:
s210, establishing a thermal management system simulation model; the thermal management system simulation model comprises a power assembly simulation model and a thermal management component simulation model.
S220, determining the power assembly simulation temperature according to the total power of the heating of the power assembly, the input power of the thermal management component and the simulation parameters determined by the thermal management system simulation model, and determining the precision of the power assembly simulation temperature according to the power assembly simulation temperature.
And S230, acquiring the power assembly measured temperature in the real thermal management system by the temperature sensor in real time, and determining the power assembly measured temperature precision according to the power assembly measured temperature.
S240, determining the optimal temperature of the power assembly according to the power assembly simulation temperature, the power assembly simulation temperature precision, the power assembly measurement temperature and the power assembly measurement temperature precision.
S250, detecting whether the temperature sensor has a fault; when the temperature sensor breaks down, the accuracy of the measured temperature of the power assembly is adjusted.
When the temperature sensor fails, the measured temperature of the power assembly in the real thermal management system cannot be acquired, the measured temperature of the power assembly is unreliable, the precision of the measured temperature of the power assembly can be adjusted to 0, and the optimal temperature of the power assembly is directly determined by the simulation temperature of the power assembly.
S260, determining whether the variation of the temperature measured by each power assembly is greater than the preset variation within the preset time; and if the variation of the temperature measured by each power assembly is larger than the preset variation, adjusting the simulation temperature precision of the power assemblies.
The thermal management system model is a static model, the test data is also static data, and the power assembly simulation temperature determined by the thermal management system model is also static data; if the temperature change rate detected by the temperature sensor exceeds a certain value, the working condition characteristic belongs to the dynamic characteristic of the thermal management system, so that the simulation precision of the thermal management model is relatively reduced, the precision of the temperature signal measured by the power assembly is improved, the simulation temperature precision of the power assembly is reduced, and the optimal temperature of the power assembly can be more reliable and accurate. On the basis of the scheme, the scheme is also suitable for providing reliable power assembly temperature signals under different working conditions.
The embodiment of the invention also provides a power assembly temperature estimation device, which can execute the power assembly temperature estimation method provided by any embodiment of the invention and has corresponding functional modules and beneficial effects of the execution method. Fig. 4 is a schematic structural diagram of an estimation apparatus of a powertrain temperature according to an embodiment of the present invention, as shown in fig. 4, the estimation apparatus includes:
a simulation model establishing module 10, configured to establish a thermal management system simulation model; the thermal management system simulation model comprises a power assembly simulation model and a thermal management component simulation model;
the simulation temperature determining module 20 is used for determining the simulation temperature of the power assembly according to the total heating power of the power assembly, the input power of the thermal management component and the simulation parameters determined by the thermal management system simulation model, and determining the precision of the simulation temperature of the power assembly according to the simulation temperature of the power assembly and the actual temperature of the power assembly;
the measured temperature determining module 30 is used for acquiring the power assembly measured temperature acquired by the temperature sensor in real time in the real thermal management system and determining the power assembly measured temperature precision according to the power assembly measured temperature and the power assembly actual temperature;
and the optimal temperature determination module 40 is used for determining the optimal temperature of the power assembly according to the power assembly simulation temperature, the power assembly simulation temperature precision, the power assembly measurement temperature and the power assembly measurement temperature precision.
Optionally, the optimal temperature determining module 40 includes:
the first correction unit is used for determining the power assembly correction simulation temperature according to the power assembly simulation temperature and the power assembly simulation temperature precision;
the second correction unit is used for determining the power assembly correction measurement temperature according to the power assembly measurement temperature and the power assembly measurement temperature precision;
and the optimal temperature determining unit is used for determining the optimal temperature of the power assembly according to the corrected simulation temperature of the power assembly and the corrected measured temperature of the power assembly.
Optionally, the method further includes:
the first detection module is used for detecting whether the temperature sensor fails or not;
and the first adjusting module is used for adjusting the precision of the measured temperature of the power assembly when the temperature sensor fails.
Optionally, the method further includes:
the second detection module is used for determining whether the variation of the temperature measured by the power assembly is greater than the preset variation within the preset time;
and the second adjusting module is used for adjusting the simulation temperature precision of the power assembly when the variation of the measured temperature of the power assembly is greater than the preset variation.
Fig. 5 is a schematic structural diagram of a vehicle control unit according to an embodiment of the present invention, as shown in fig. 5, the vehicle control unit includes a processor 70, a memory 71, an input device 72, and an output device 73; the number of the processors 70 in the vehicle control unit may be one or more, and one processor 70 is taken as an example in fig. 5; the processor 70, the memory 71, the input device 72 and the output device 73 in the vehicle control unit may be connected by a bus or other means, and fig. 5 illustrates the connection by the bus as an example.
The memory 71 is a computer readable storage medium for storing software programs, computer executable programs, and modules, such as program instructions/modules corresponding to the powertrain temperature estimation method in the present embodiment. The processor 70 executes various functional applications and data processing of the vehicle control unit by executing software programs, instructions and modules stored in the memory 71, so as to implement the powertrain temperature estimation method.
The memory 71 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 71 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 71 may further include memory located remotely from the processor 70, which may be connected to the hybrid vehicle controller via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 72 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the hybrid vehicle controller. The output device 73 may include a display device such as a display screen.
Embodiments of the present invention also provide a storage medium containing computer-executable instructions which, when executed by a computer processor, perform a powertrain temperature estimation method, the method comprising:
establishing a thermal management system simulation model; the thermal management system simulation model comprises a power assembly simulation model and a thermal management component simulation model;
determining the power assembly simulation temperature according to the total heating power of the power assembly, the input power of the thermal management component and the simulation parameters determined by the thermal management system simulation model, and determining the power assembly simulation temperature precision according to the power assembly simulation temperature and the actual power assembly temperature;
acquiring the temperature measured by each power assembly in a real-time thermal management system through a temperature sensor, and determining the precision of the measured temperature of the power assembly according to the measured temperature of the power assembly and the actual temperature of the power assembly;
and determining the optimal temperature of the power assembly according to the power assembly simulation temperature, the power assembly simulation temperature precision, the power assembly measured temperature and the power assembly measured temperature precision.
Of course, the storage medium containing computer-executable instructions provided by the embodiments of the present invention is not limited to the method operations described above, and may also perform related operations in the powertrain temperature estimation method provided by any of the embodiments of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly can be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the search apparatus, each included unit and each included module are merely divided according to functional logic, but are not limited to the above division, as long as corresponding functions can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A powertrain temperature estimation method, comprising:
establishing a thermal management system simulation model; the thermal management system simulation model comprises a power assembly simulation model and a thermal management component simulation model;
determining the power assembly simulation temperature according to the total heating power of the power assembly, the input power of the thermal management component and the simulation parameters determined by the thermal management system simulation model, and determining the power assembly simulation temperature precision according to the power assembly simulation temperature and the actual power assembly temperature;
acquiring a power assembly measured temperature in a real thermal management system by a temperature sensor in real time, and determining the power assembly measured temperature precision according to the power assembly measured temperature and the power assembly actual temperature;
and determining the optimal temperature of the power assembly according to the power assembly simulation temperature, the power assembly simulation temperature precision, the power assembly measured temperature and the power assembly measured temperature precision.
2. The method of claim 1, wherein determining a powertrain optimum temperature based on the powertrain simulated temperature, the powertrain simulated temperature accuracy, the powertrain measured temperature, and the powertrain measured temperature accuracy comprises:
determining the power assembly correction simulation temperature according to the power assembly simulation temperature and the power assembly simulation temperature precision;
determining the power assembly correction measurement temperature according to the power assembly measurement temperature and the power assembly measurement temperature precision;
and determining the optimal temperature of the power assembly according to the corrected simulation temperature of the power assembly and the corrected measured temperature of the power assembly.
3. The powertrain temperature estimation method of claim 1, further comprising:
detecting whether the temperature sensor fails;
and when the temperature sensor fails, adjusting the precision of the temperature measured by the power assembly.
4. The powertrain temperature estimation method of claim 1, further comprising:
determining whether the variation of the measured temperature of the power assembly is greater than a preset variation within a preset time;
and if the variation of the measured temperature of the power assembly is greater than the preset variation, adjusting the simulation temperature precision of the power assembly.
5. The powertrain temperature estimation method of claim 1, wherein the thermal management system simulation model comprises a first thermal management system simulation model;
the first thermal management system simulation model comprises a first powertrain simulation model and a first thermal management component model; the first power assembly simulation model comprises a power motor, a direct current converter and a vehicle-mounted charger; the first heat management assembly model comprises a fan, a water pump and a heat exchange device; the power motor, the direct current converter, the vehicle-mounted charger, the water pump and the heat exchange device form a circulation loop through a cooling medium pipeline, and the fan is coupled with the heat exchange device.
6. The powertrain temperature estimation method of claim 1, wherein the thermal management system simulation model comprises a second thermal management system simulation model;
the second thermal management system simulation model comprises a second powertrain simulation model and a second thermal management component model; the second power assembly simulation model comprises a power battery; the second heat management component model comprises an electric heating device, an electric cooling device and a water pump; the power battery, the electric heating device, the electric cooling device and the water pump form a circulation loop through a cooling medium pipeline.
7. A powertrain temperature estimation arrangement, comprising:
the simulation model establishing module is used for establishing a thermal management system simulation model; the thermal management system simulation model comprises a power assembly simulation model and a thermal management component simulation model;
the simulation temperature determination module is used for determining the simulation temperature of the power assembly according to the total heating power of the power assembly, the input power of the thermal management component and the simulation parameters determined by the thermal management system simulation model, and determining the precision of the simulation temperature of the power assembly according to the simulation temperature of the power assembly;
the measurement temperature determining module is used for acquiring the temperature measured by each power assembly in the real thermal management system collected by the temperature sensor in real time and determining the precision of the measurement temperature of the power assembly according to the measurement temperature of the power assembly;
and the optimal temperature determination module is used for determining the optimal temperature of the power assembly according to the power assembly simulation temperature, the power assembly simulation temperature precision, the power assembly measured temperature and the power assembly measured temperature precision.
8. A vehicle control unit, characterized in that, vehicle control unit includes:
one or more processors;
a storage device to store one or more programs,
when executed by the one or more processors, cause the one or more processors to implement the powertrain temperature estimation method of any of claims 1-6.
9. A storage medium containing computer-executable instructions for performing the powertrain temperature estimation method of any of claims 1-6 when executed by a computer processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210614023.6A CN115033988A (en) | 2022-05-31 | 2022-05-31 | Power assembly temperature estimation method and device, vehicle control unit and medium |
Applications Claiming Priority (1)
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