CN116929595A - Temperature detection method and device for power module of new energy vehicle motor controller - Google Patents
Temperature detection method and device for power module of new energy vehicle motor controller Download PDFInfo
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- CN116929595A CN116929595A CN202310823009.1A CN202310823009A CN116929595A CN 116929595 A CN116929595 A CN 116929595A CN 202310823009 A CN202310823009 A CN 202310823009A CN 116929595 A CN116929595 A CN 116929595A
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- power module
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- 238000001514 detection method Methods 0.000 title claims abstract description 20
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 62
- 229910052802 copper Inorganic materials 0.000 claims abstract description 62
- 239000010949 copper Substances 0.000 claims abstract description 62
- 230000017525 heat dissipation Effects 0.000 claims abstract description 44
- 239000000110 cooling liquid Substances 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 15
- 230000005855 radiation Effects 0.000 claims abstract description 5
- 239000004519 grease Substances 0.000 claims description 7
- 229920001296 polysiloxane Polymers 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 238000002360 preparation method Methods 0.000 description 11
- 239000002826 coolant Substances 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
Abstract
The application discloses a temperature detection method and a device for a power module of a new energy vehicle motor controller, wherein the method comprises the following steps: receiving the temperature of an upper heat dissipation copper plate of the power module; calculating the power loss of the power module and the diode according to the working state of the motor controller; the top surfaces of the diode and the power module are attached to the bottom surface of the upper heat dissipation copper plate; receiving the flow rate and the temperature of cooling liquid entering a radiator of the power module; a medium is arranged between the radiator and the power module; and calculating the actual temperature of the power module according to the temperature of the upper heat dissipation copper plate, the power loss of the power module and the diode and the flow and the temperature of the cooling liquid. According to the application, the actual temperature of the power module is calculated by combining the temperature of the heat radiation copper plate of the power module of the motor controller, the power loss of the power module and the diode, and the flow and the temperature of the cooling liquid, so that the internal temperature of the power module can be reflected more accurately.
Description
Technical Field
The application relates to the technical field of detection, in particular to a temperature detection method and device for a power module of a new energy vehicle motor controller.
Background
In new energy vehicles, the power module is a very important part, and has a critical influence on the stability and safety of a vehicle. The power module is a core device for energy conversion and transmission, is a CPU in the motor controller MCU (motor controller unit), and the temperature control of the power module directly influences the energy conversion efficiency and the performance of the controller.
Because the thermal resistance of the power module is influenced by the flow of cooling liquid, a model is built by singly using the temperature value acquired by the temperature sensor on the outer surface of the heat-dissipating copper plate, so that the model precision is lower, and two problems possibly exist: firstly, if the temperature model is conservative, the temperature limit value in the using process is lower, so that the performance of the motor controller can not be fully utilized, and the energy conversion efficiency is reduced; secondly, if the temperature model is more aggressive, the temperature limit value in the use process is higher, and the quality and the service life of the motor controller are affected.
Disclosure of Invention
The application provides a temperature detection method and a temperature detection device for a power module of a motor controller of a new energy vehicle, which are used for calculating the actual temperature of the power module by combining the temperature of a heat radiation copper plate of the power module of the motor controller, the power loss of the power module and a diode, and the flow and the temperature of cooling liquid, so that the internal temperature of the power module can be more accurately reflected, the performance of the controller can be fully exerted, and the quality and the service life of the motor controller can be protected.
The application provides a temperature detection method of a power module of a new energy vehicle motor controller, which comprises the following steps:
receiving the temperature of an upper heat dissipation copper plate of the power module;
calculating the power loss of the power module and the diode according to the working state of the motor controller; the top surfaces of the diode and the power module are attached to the bottom surface of the upper heat dissipation copper plate;
receiving the flow rate and the temperature of cooling liquid entering a radiator of the power module; a medium is arranged between the radiator and the power module;
and calculating the actual temperature of the power module according to the temperature of the upper heat dissipation copper plate, the power loss of the power module and the diode and the flow and the temperature of the cooling liquid.
Preferably, when calculating the actual temperature of the power module, determining the thermal resistance of the diode and the thermal resistance of the power module respectively according to the flow of the cooling liquid; and then calculating the actual temperature of the power module by using the temperature of the upper heat dissipation copper plate, the power loss of the power module and the diode, the temperature of the cooling liquid, the thermal resistance of the diode and the thermal resistance of the power module.
Preferably, calculating the actual temperature of the power module specifically includes:
calculating the sum of the thermal resistance of the diode and the thermal resistance of the power module;
calculating the product of the power loss and the sum of the power module and the diode;
calculating the average value of the square sum of the temperature of the cooling liquid and the temperature of the upper heat dissipation copper plate;
the sum between the product and the value obtained for the mean root number is calculated as the actual temperature of the power module.
Preferably, a lower heat dissipation copper plate is arranged between the heat radiator and the power module.
Preferably, a heat-conducting silicone grease is arranged between the radiator and the lower heat-radiating copper plate.
The application also provides a temperature detection device of the power module of the new energy vehicle motor controller, which comprises a first receiving module, a power calculation module, a second receiving module and a first temperature calculation module;
the first receiving module is used for receiving the temperature of the upper heat dissipation copper plate of the power module;
the power calculation module is used for calculating the power loss of the power module and the diode according to the working state of the motor controller; the top surfaces of the diode and the power module are attached to the bottom surface of the upper heat dissipation copper plate;
the second receiving module is used for receiving the flow and the temperature of the cooling liquid entering the radiator of the power module; a medium is arranged between the radiator and the power module;
the first temperature calculation module is used for calculating the actual temperature of the power module according to the temperature of the upper heat dissipation copper plate, the power loss of the power module and the diode, and the flow and the temperature of the cooling liquid.
Preferably, the first temperature calculation module includes a thermal resistance determination module and a second temperature calculation module;
the thermal resistance determining module is used for respectively determining the thermal resistance of the diode and the thermal resistance of the power module according to the flow of the cooling liquid;
the second temperature calculation module is used for calculating the actual temperature of the power module by using the temperature of the upper heat dissipation copper plate, the power loss of the power module and the diode, the temperature of the cooling liquid, the thermal resistance of the diode and the thermal resistance of the power module.
Preferably, the second temperature calculation module comprises a first and calculation module, a product module, a mean calculation module and a second and calculation module;
the first and calculating modules are used for calculating the sum of the thermal resistance of the diode and the thermal resistance of the power module;
the product module is used for calculating the product of the power loss and the sum of the power module and the diode;
the mean value calculation module is used for calculating the mean value of the square sum of the temperature of the cooling liquid and the temperature of the upper heat dissipation copper plate;
the second sum calculation module is used for calculating the sum between the product and the value obtained for the mean root number as the actual temperature of the power module.
Preferably, a lower heat dissipation copper plate is arranged between the heat radiator and the power module.
Preferably, a heat-conducting silicone grease is arranged between the radiator and the lower heat-radiating copper plate.
Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the application, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
FIG. 1 is a flow chart of a temperature detection method of a power module of a new energy vehicle motor controller provided by the application;
FIG. 2 is a graph of thermal resistance versus flow rate for one embodiment provided by the present application;
FIG. 3 is a block diagram of a temperature acquisition system according to the present application;
FIG. 4 is a control schematic of the temperature acquisition system shown in FIG. 3;
fig. 5 is a block diagram of a temperature detection device of a power module of a new energy vehicle motor controller provided by the application.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods, and apparatus should be considered part of the specification.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
The application provides a temperature detection method and a temperature detection device for a power module of a motor controller of a new energy vehicle, which are used for calculating the actual temperature of the power module by combining the temperature of a heat radiation copper plate of the power module of the motor controller, the power loss of the power module and a diode, and the flow and the temperature of cooling liquid, so that the internal temperature of the power module can be more accurately reflected, the performance of the controller can be fully exerted, the quality and the service life of the motor controller can be protected, and meanwhile, accurate input can be provided for a whole vehicle thermal management system, and the whole vehicle thermal management efficiency is improved.
As shown in fig. 1, the method for detecting the temperature of the power module of the new energy vehicle motor controller provided by the application comprises the following steps:
s110: temperature T of upper heat dissipation copper plate of receiving power module Upper plate 。
S120: calculating the power loss P of the power module and the diode according to the working state of the motor controller Loss of . The top surfaces of the diode and the power module are attached to the bottom surface of the upper heat dissipation copper plate.
S130: receiving a flow rate Q of coolant entering a radiator (i.e., upstream of the radiator) of the power module Water and its preparation method And temperature T Water and its preparation method The method comprises the steps of carrying out a first treatment on the surface of the And a medium is arranged between the radiator and the power module.
S140: according to the temperature T of the upper heat dissipation copper plate Upper plate Power loss P of power module and diode Loss of Flow rate Q of cooling liquid Water and its preparation method And temperature T Water and its preparation method Calculating the actual temperature T of the power module Power of 。
When the coolant flows are different, the thermal resistances of the power module and the diode are different, as shown in fig. 2. Based on the above, when calculating the actual temperature of the power module, the thermal resistance R of the diode is respectively determined according to the flow rate of the cooling liquid Diode And thermal resistance R of power module Power of The method comprises the steps of carrying out a first treatment on the surface of the Then utilize the temperature T of the upper heat dissipation copper plate Upper plate Power loss P of power module and diode Loss of Temperature T of coolant Water and its preparation method Thermal resistance R of diode Diode And thermal resistance R of power module Power of Calculating the actual temperature T of the power module Power of 。
Specifically, the temperature T of the upper heat-radiating copper plate is utilized Upper plate Power loss P of power module and diode Loss of Temperature T of coolant Water and its preparation method Thermal resistance R of diode Diode And thermal resistance R of power module Power of Calculating the actual temperature T of the power module Power of The method specifically comprises the following steps:
p1: calculating the thermal resistance R of the diode Diode And thermal resistance R of power module Power of A kind of electronic device.
P2: calculating power loss P of power module and diode Loss of And (3) the product of the sum.
P3: calculating the temperature T of the cooling liquid Water and its preparation method And temperature T of upper heat-radiating copper plate Upper plate The average of the sum of squares of (c).
P4: calculating the sum of the product and the value obtained for the mean root number as the actual temperature T of the power module Power of 。
Based on the above-described embodiments of the present application,
as an example, as shown in fig. 3, the temperature acquisition system includes a diode 5, an upper heat radiation copper plate 4, a first temperature sensor 3, a radiator 9, and a flow sensor 7 and a second temperature sensor 8 provided on a coolant line provided upstream of the radiator 9. A medium is arranged between the heat sink 9 and the power module 2.
As an example, the medium comprises a lower heat-dissipating copper plate 1. The power module 2 and the diode 5 are arranged at intervals on the horizontal plane, and the top surface and the bottom surface of the power module 2 and the diode are respectively attached to the upper heat dissipation copper plate 4 and the lower heat dissipation copper plate 1. The diode 5 is used for rectifying and freewheeling signals and consuming current generated by back electromotive force, so that the safety of other elements in the circuit is ensured. The upper heat dissipation copper plate 4 is fixedly connected with the first temperature sensor 3 and is used for helping the power module 2 to dissipate heat from the upper part. The first temperature sensor 3 is used for collecting the temperature T of the upper heat dissipation copper plate 4 Upper plate . The lower heat-dissipating copper plate 1 is used for fixing the power module 2 and the diode 5, and for helping the power module 2 to dissipate heat from the lower part.
Preferably, the medium further comprises a heat conductive silicone grease 6 between the heat sink and the lower heat-dissipating copper plate for conducting heat on the lower heat-dissipating copper plate 1 to the heat sink 9.
The flow sensor 7 and the second temperature sensor 8 are used for acquiring the flow and the temperature of the cooling liquid entering the radiator 9 in real time.
When the motor controller works, the temperature of the power module 2 can be quickly increased, heat is transferred outwards through the upper heat dissipation copper plate 4, and the temperature of the upper heat dissipation copper plate 4 can be directly collected through the first temperature sensor 3. The cooling liquid flows through the second temperature sensor 8 and the flow sensor 7 through the cooling liquid pipeline to enter the radiator 9, and the power module 2 is cooled through the heat conduction silicone grease 6 and the lower heat dissipation copper plate 1.
As shown in fig. 4, the motor controller MCU (Motor Controller Unit) receives the temperature T of the upper heat-dissipating copper plate acquired by the first temperature sensor Upper plate And the flow rate Q of the cooling liquid collected by the flow sensor Water and its preparation method The whole vehicle controller VCU (Vehicle Control Unit) receives the temperature T of the coolant acquired by the second temperature sensor 8 Water and its preparation method And transmitted to MCU, MCU combines the power loss P of power module and diode obtained by self calculation Loss of Temperature T with upper heat-dissipating copper plate Upper plate Flow rate Q of coolant Water and its preparation method And temperature T Water and its preparation method Calculating the actual temperature T of the power module Power of And according to the actual temperature T Power of Controlling the power and torque of the motor, and simultaneously enabling the MCU to control the actual temperature T Power of Transmitted to the VCU, so that the VCU can control the power module according to the actual temperature T of the power module Power of Thermal management needs are placed on the thermal management module, which sends a corresponding duty cycle signal to the water pump to control the water pump.
Based on the temperature detection method, the application also provides a temperature detection device of the power module of the new energy vehicle motor controller. As shown in fig. 5, the temperature detecting apparatus includes a first receiving module 510, a power calculating module 520, a second receiving module 530, and a first temperature calculating module 540.
The first receiving module 510 is configured to receive a temperature of an upper heat dissipation copper plate of the power module.
The power calculation module 520 is configured to calculate a power loss of the power module and the diode according to an operation state of the motor controller. The top surfaces of the diode and the power module are attached to the bottom surface of the upper heat dissipation copper plate.
The second receiving module 530 is used for receiving the flow rate and temperature of the cooling liquid entering the radiator of the power module. A medium is arranged between the radiator and the power module.
The first temperature calculating module 540 is used for calculating the actual temperature of the power module according to the temperature of the upper heat dissipation copper plate, the power loss of the power module and the diode, and the flow rate and the temperature of the cooling liquid.
Preferably, the first temperature calculation module 540 includes a thermal resistance determination module 5401 and a second temperature calculation module 5402.
The thermal resistance determining module 5401 is used for determining the thermal resistance of the diode and the thermal resistance of the power module respectively according to the flow rate of the cooling liquid.
The second temperature calculating module 5402 is used to calculate the actual temperature of the power module using the temperature of the upper heat-dissipating copper plate, the power loss of the power module and the diode, the temperature of the coolant, the thermal resistance of the diode, and the thermal resistance of the power module.
Preferably, the second temperature calculating module 5402 includes a first and calculating module, a product module, a mean calculating module, and a second and calculating module.
The first and calculating modules are used for calculating the sum of the thermal resistance of the diode and the thermal resistance of the power module.
The product module is used for calculating the product of the power loss and the sum of the power module and the diode.
The average value calculation module is used for calculating the average value of the square sum of the temperature of the cooling liquid and the temperature of the upper heat dissipation copper plate.
The second sum calculation module is used for calculating the sum between the product and the value obtained for the mean root number as the actual temperature of the power module.
Preferably, a lower heat dissipation copper plate is arranged between the heat radiator and the power module.
Preferably, a heat-conducting silicone grease is arranged between the radiator and the lower heat-radiating copper plate.
While certain specific embodiments of the application have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.
Claims (10)
1. The temperature detection method of the power module of the new energy vehicle motor controller is characterized by comprising the following steps of:
receiving the temperature of an upper heat dissipation copper plate of the power module;
calculating the power loss of the power module and the diode according to the working state of the motor controller; the top surfaces of the diode and the power module are attached to the bottom surface of the upper heat dissipation copper plate;
receiving the flow rate and the temperature of cooling liquid entering a radiator of the power module; a medium is arranged between the radiator and the power module;
and calculating the actual temperature of the power module according to the temperature of the upper heat dissipation copper plate, the power loss of the power module and the diode and the flow and the temperature of the cooling liquid.
2. The method for detecting the temperature of a power module of a new energy vehicle motor controller according to claim 1, wherein when the actual temperature of the power module is calculated, the thermal resistance of a diode and the thermal resistance of the power module are respectively determined according to the flow rate of the cooling liquid; and then calculating the actual temperature of the power module by using the temperature of the upper heat dissipation copper plate, the power loss of the power module and the diode, the temperature of the cooling liquid, the thermal resistance of the diode and the thermal resistance of the power module.
3. The method for detecting the temperature of the power module of the new energy vehicle motor controller according to claim 2, wherein calculating the actual temperature of the power module specifically comprises:
calculating the sum of the thermal resistance of the diode and the thermal resistance of the power module;
calculating the product of the power loss of the power module and the diode and the sum;
calculating the average value of the square sum of the temperature of the cooling liquid and the temperature of the upper heat dissipation copper plate;
and calculating the sum between the product and the value obtained for the mean root number as the actual temperature of the power module.
4. The method for detecting the temperature of the power module of the new energy vehicle motor controller according to claim 1, wherein a lower heat dissipation copper plate is arranged between the heat sink and the power module.
5. The method for detecting the temperature of the power module of the new energy vehicle motor controller according to claim 4, wherein a heat conductive silicone grease is arranged between the radiator and the lower heat dissipation copper plate.
6. The temperature detection device of the power module of the new energy vehicle motor controller is characterized by comprising a first receiving module, a power calculation module, a second receiving module and a first temperature calculation module;
the first receiving module is used for receiving the temperature of an upper heat dissipation copper plate of the power module;
the power calculation module is used for calculating the power loss of the power module and the diode according to the working state of the motor controller; the top surfaces of the diode and the power module are attached to the bottom surface of the upper heat dissipation copper plate;
the second receiving module is used for receiving the flow and the temperature of the cooling liquid entering the radiator of the power module; a medium is arranged between the radiator and the power module;
the first temperature calculation module is used for calculating the actual temperature of the power module according to the temperature of the upper heat dissipation copper plate, the power loss of the power module and the diode, and the flow and the temperature of the cooling liquid.
7. The temperature detection device of the power module of the new energy vehicle motor controller according to claim 6, wherein the first temperature calculation module includes a thermal resistance determination module and a second temperature calculation module;
the thermal resistance determining module is used for respectively determining the thermal resistance of the diode and the thermal resistance of the power module according to the flow of the cooling liquid;
the second temperature calculation module is used for calculating the actual temperature of the power module by using the temperature of the upper heat dissipation copper plate, the power loss of the power module and the diode, the temperature of the cooling liquid, the thermal resistance of the diode and the thermal resistance of the power module.
8. The temperature detection device of claim 7, wherein the second temperature calculation module comprises a first and calculation module, a product module, a mean calculation module, and a second and calculation module;
the first and calculating modules are used for calculating the sum of the thermal resistance of the diode and the thermal resistance of the power module;
the product module is used for calculating the product of the power loss of the power module and the diode and the sum;
the mean value calculation module is used for calculating the mean value of the square sum of the temperature of the cooling liquid and the temperature of the upper heat dissipation copper plate;
the second sum calculating module is used for calculating the sum between the product and the value obtained for the mean root number as the actual temperature of the power module.
9. The temperature detecting device for a power module of a new energy vehicle motor controller according to claim 6, wherein a lower heat radiation copper plate is provided between the heat radiator and the power module.
10. The temperature detection device of the power module of the new energy vehicle motor controller according to claim 9, wherein a heat conductive silicone grease is provided between the heat sink and the lower heat dissipation copper plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310823009.1A CN116929595A (en) | 2023-07-05 | 2023-07-05 | Temperature detection method and device for power module of new energy vehicle motor controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310823009.1A CN116929595A (en) | 2023-07-05 | 2023-07-05 | Temperature detection method and device for power module of new energy vehicle motor controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116929595A true CN116929595A (en) | 2023-10-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310823009.1A Pending CN116929595A (en) | 2023-07-05 | 2023-07-05 | Temperature detection method and device for power module of new energy vehicle motor controller |
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| Country | Link |
|---|---|
| CN (1) | CN116929595A (en) |
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2023
- 2023-07-05 CN CN202310823009.1A patent/CN116929595A/en active Pending
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