CN112895912A - Thermal protection method and device of IGBT module and vehicle - Google Patents
Thermal protection method and device of IGBT module and vehicle Download PDFInfo
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- CN112895912A CN112895912A CN202110120908.6A CN202110120908A CN112895912A CN 112895912 A CN112895912 A CN 112895912A CN 202110120908 A CN202110120908 A CN 202110120908A CN 112895912 A CN112895912 A CN 112895912A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- 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
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Abstract
The application discloses thermal protection method and device of an IGBT module and a vehicle, wherein the method comprises the following steps: detecting whether a cooling system of a vehicle is malfunctioning; when a cooling system fault is detected, respectively reducing the current maximum torque and the current maximum power of a motor controller of a vehicle to a preset maximum torque and a preset maximum power, wherein the preset maximum torque is smaller than the current maximum torque, and the preset maximum power is smaller than the current maximum power; when the fault of the cooling system is prompted, the temperature of an IGBT module of the motor controller is controlled to be lower than the damage temperature according to the preset maximum torque and the preset maximum power as the limit value of the motor controller. Therefore, the problem that thermal protection of the IGBT module cannot be effectively achieved in the related technology is solved, a driver can be guaranteed to drive a vehicle to a maintenance point to perform detection and maintenance under the condition that the cooling system is not damaged, and the reliability of the whole vehicle is improved while the safety of the whole vehicle is improved.
Description
Technical Field
The present disclosure relates to the field of vehicle technologies, and in particular, to a thermal protection method and apparatus for an IGBT (Insulated Gate Bipolar Transistor) module, and a vehicle.
Background
The driving system is one of the core components of the electric automobile, and the safety and the reliability of the driving system directly influence the safety and the reliability of the whole electric automobile. At present, the technology in the field of driving motors is mature, the design method, the design theory and the process technology are accumulated and precipitated after time, and the safety and the reliability of the driving motor can be ensured to a certain extent. Therefore, the safety and reliability of the motor controller for the vehicle are very important. The vehicle motor controller needs to pay attention to a plurality of factors, wherein the IGBT module is the most important factor of the vehicle motor controller, the torque requirement of a driver is converted into required current through a software algorithm controlled by the motor, the IGBT module is controlled to take power from a battery and supply the power to a driving motor, and the reliability of the IGBT module is directly related to the running of a vehicle. Ensuring the normal and reliable operation of the IGBT is an important issue.
Overvoltage, overcurrent and high temperature are main factors causing the failure of the IGBT module, an HP2 structure in the IGBT module is directly water-cooled, heat generated by the IGBT is transferred through a PINFIN below the module, as shown in fig. 1, the heat capacity of the PINFIN is very small, and the heat on the PINFIN structure can be continuously taken away by flowing water to achieve the heat dissipation effect. An NTC (Negative Temperature Coefficient) thermistor in the HP2 module does not directly detect the Temperature of the IGBT chip, but indirectly detects the Temperature of the IGBT. The heat of IGBT, pass to the base plate through DCB (Direct Copper Bonding, ceramic base Copper clad laminate), then dispel the heat through radiator or PINFEN, and NTC can only indirectly gather the temperature of IGBT chip through the temperature of gathering DCB, as shown in figure 2, so when IGBT temperature rapid change, the temperature of IGBT can't in time be reacted to NTC, if there is heavy current short time through IGBT, a large amount of heat of production can't in time transmit NTC, cooling system is unusual this moment and also appears, can't in time take away the heat. Therefore, the normal operation of the cooling system is a precondition for ensuring the normal use of the IGBT module with the HP2 structure, and the fault probability of the system is high.
Therefore, how to protect the IGBT module from damage when an abnormality occurs in the cooling system is important.
Content of application
The application provides a thermal protection method and device for an IGBT module and a vehicle, and aims to solve the problem that thermal protection of the IGBT module cannot be effectively achieved in the related art, so that a driver can be guaranteed to drive the vehicle to a maintenance point to perform detection and maintenance in a state that a cooling system fault is not damaged, and the reliability of the whole vehicle is improved while the safety of the whole vehicle is improved.
An embodiment of a first aspect of the present application provides a thermal protection method for an IGBT module, including the following steps:
detecting whether a cooling system of a vehicle is malfunctioning;
when the cooling system fault is detected, respectively reducing the current maximum torque and the current maximum power of a motor controller of the vehicle to a preset maximum torque and a preset maximum power, wherein the preset maximum torque is smaller than the current maximum torque, and the preset maximum power is smaller than the current maximum power; and
and when the fault of the cooling system is prompted, controlling the temperature of an IGBT module of the motor controller to be lower than the damage temperature according to the preset maximum torque and the preset maximum power as the limit value of the motor controller.
Optionally, before reducing the current maximum torque and the current maximum power of the vehicle to the preset torque and the preset power respectively, the method further comprises:
when the cooling system stops working, identifying the maximum current meeting the temperature rise passing condition according to the temperature rise curve of the IGBT module;
and calculating the preset torque and preset power at each rotating speed based on the maximum current.
Optionally, the method further comprises:
collecting the actual temperature of the IGBT module;
and if the actual temperature is higher than the preset temperature and no fault of the cooling system is detected, taking the preset maximum torque and the preset maximum power as the actual limit value, and performing exception reminding.
Optionally, the reducing the current maximum torque and the current maximum power of the motor controller of the vehicle to a preset maximum torque and a preset maximum power, respectively, includes:
acquiring the actual speed of the electric automobile;
and matching the corresponding preset maximum torque and the preset maximum power according to the actual rotating speed.
Optionally, before detecting whether the cooling system of the vehicle is failed, the method further comprises:
acquiring the current torque demand of a driver and the actual temperature of the IGBT module;
and if the current torque demand is greater than a preset threshold value or the actual temperature is higher than a preset temperature, sending a cooling request to the cooling system.
An embodiment of a second aspect of the present application provides a thermal protection device for an IGBT module, including:
the detection module is used for detecting whether a cooling system of the vehicle is in failure;
a first control module, configured to, when a failure of the cooling system is detected, reduce a current maximum torque and a current maximum power of a motor controller of the vehicle to a preset maximum torque and a preset maximum power, respectively, where the preset maximum torque is smaller than the current maximum torque, and the preset maximum power is smaller than the current maximum power; and
and the second control module is used for prompting the fault of the cooling system and controlling the temperature of an IGBT module of the motor controller to be lower than the damage temperature according to the preset maximum torque and the preset maximum power as the limit value of the motor controller.
Optionally, before the current maximum torque and the current maximum power of the vehicle are respectively reduced to the preset torque and the preset power, the first control module further includes:
the identification unit is used for identifying the maximum current meeting the temperature rise passing condition according to the temperature rise curve of the IGBT module when the cooling system stops working;
and the calculating unit is used for calculating the preset torque and the preset power at each rotating speed based on the maximum current.
Optionally, the method further comprises:
the collection module is used for collecting the actual temperature of the IGBT module;
and the reminding module is used for taking the preset maximum torque and the preset maximum power as the actual limiting value and carrying out abnormity reminding when the actual temperature is higher than the preset temperature and the cooling system is detected to be free from faults.
Optionally, the first control module comprises:
the first acquisition unit is used for acquiring the actual speed of the electric automobile;
and the matching unit is used for matching the corresponding preset maximum torque and the preset maximum power according to the actual rotating speed.
Optionally, before detecting whether the cooling system of the vehicle is faulty, the detection module further includes:
the second acquisition unit is used for acquiring the current torque demand of a driver and the actual temperature of the IGBT module;
and the sending unit is used for sending a cooling request to the cooling system when the current torque demand is greater than a preset threshold value or the actual temperature is higher than a preset temperature.
An embodiment of the third aspect of the application provides a vehicle, which comprises the thermal protection device of the IGBT module.
According to the vehicle provided by the embodiment of the application, whether a cooling system of the vehicle breaks down or not can be detected, when the cooling system breaks down is detected, the current maximum torque and the current maximum power of a motor controller of the vehicle are respectively reduced to the preset maximum torque and the preset maximum power, and when the cooling system breaks down, the temperature of an IGBT (insulated gate bipolar translator) module of the motor controller is controlled to be lower than the damage temperature according to the preset maximum torque and the preset maximum power as the limiting values of the motor controller, so that the problem that the thermal protection of the IGBT module cannot be effectively realized in the related technology is solved, a driver can be ensured to drive the vehicle to a maintenance point to detect and maintain the cooling system in the state that the cooling system breaks down, the reliability of the whole vehicle is improved, and the safety of the whole vehicle is improved.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic heat dissipation diagram of a PINFIN structure;
FIG. 2 is a schematic diagram of IGBT temperature detection;
fig. 3 is a flowchart of a thermal protection method for an IGBT module according to an embodiment of the present application;
FIG. 4 is a schematic diagram of external characteristic limits in the event of an anomaly in a cooling system according to one embodiment of the present application;
FIG. 5 is a schematic diagram of a system operating according to the thermal protection method of the GBT module according to an embodiment of the present application;
FIG. 6 is a flow diagram of a method of thermal protection of a GBT module according to one embodiment of the present application;
fig. 7 is a block schematic diagram of a thermal protection device of an IGBT module according to an embodiment of the present application;
FIG. 8 is a block diagram of an example vehicle according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The following describes a thermal protection method, device and vehicle of an IGBT module according to an embodiment of the present application with reference to the drawings. In order to solve the problem mentioned in the above background art center that the thermal protection of the IGBT module cannot be effectively realized in the related art, the present application provides a thermal protection method for the IGBT module, in which whether the cooling system of the vehicle has a fault or not can be detected, and when the cooling system fault is detected, the current maximum torque and the current maximum power of the motor controller of the vehicle are respectively reduced to the preset maximum torque and the preset maximum power, and the temperature of the IGBT module of the motor controller is controlled to be lower than the damage temperature according to the preset maximum torque and the preset maximum power as the limit values of the motor controller while the cooling system fault is prompted, so that the problem that the thermal protection of the IGBT module cannot be effectively realized in the related art is solved, and the driver can be ensured to drive the vehicle to the maintenance point for detection and maintenance in the state that the cooling system fault is not damaged by itself, the reliability of the whole vehicle is improved, and meanwhile, the safety of the whole vehicle is improved.
Specifically, fig. 3 is a schematic flow chart of a thermal protection method for an IGBT module according to an embodiment of the present application.
As shown in fig. 3, the thermal protection method of the IGBT module includes the steps of:
in step S301, it is detected whether the cooling system of the vehicle is malfunctioning.
It can be understood that, in order to ensure effective time-limited thermal protection, the embodiment of the present application may first detect whether the cooling system of the vehicle is in fault, so as to avoid the situation that thermal protection cannot be performed due to the fault of the cooling system of the vehicle.
When detecting whether the cooling system of the vehicle is in fault, the detection method in the related art may be adopted, and detailed description is omitted here to avoid redundancy.
Optionally, in some embodiments, before detecting whether the cooling system of the vehicle is faulty, the method further includes: acquiring the current torque demand of a driver and the actual temperature of an IGBT module; if the current torque demand is greater than a preset threshold, or the actual temperature is greater than a preset temperature, a cooling request is sent to the cooling system.
It can be understood that, in the embodiment of the present application, when the current torque of the driver is greater than the preset threshold and the actual temperature of the IGBT module is greater than the preset temperature, the cooling request may be sent to the cooling system, where the preset threshold and the preset temperature may be preset thresholds and temperatures by a user, thresholds and temperatures obtained through a limited number of experiments, or thresholds and temperatures obtained through a limited number of computer simulations, and are not specifically limited herein.
It should be noted that, since the water pump needs a certain time to start, the torque value needs to be smaller than a certain value T1, where T1 may be the maximum available torque when the cooling system is normal.
In step S302, when a cooling system fault is detected, a current maximum torque and a current maximum power of a motor controller of the vehicle are respectively reduced to a preset maximum torque and a preset maximum power, wherein the preset maximum torque is smaller than the current maximum torque, and the preset maximum power is smaller than the current maximum power.
Optionally, in some embodiments, reducing the current maximum torque and the current maximum power of the motor controller of the vehicle to the preset maximum torque and the preset maximum power, respectively, comprises: acquiring the actual speed of the electric automobile; and matching the corresponding preset maximum torque and the preset maximum power according to the actual rotating speed.
It can be understood that, assuming that the maximum available torque and power when the cooling system is normal are T1 and P1, respectively, when a failure of the cooling system is detected, the present embodiment of the application may reduce the current maximum torque and the current maximum power of the motor controller of the vehicle to the preset maximum torque and the preset maximum power, respectively, as shown in fig. 4, the preset maximum torque may be T2, the preset maximum power may be P2,
optionally, in some embodiments, before reducing the current maximum torque and the current maximum power of the vehicle to the preset torque and the preset power respectively, the method further comprises: when the cooling system stops working, identifying the maximum current meeting the temperature rise passing condition according to the temperature rise curve of the IGBT module; and calculating preset torque and preset power at each rotating speed based on the maximum current.
It can be understood that, in the embodiment of the present application, the IGBT temperature rise curve when the torque and the power are preset for the test of the locked rotor and no water flow is detected, and the maximum current suitable for the temperature rise is found from the low current upward test, so that the maximum torque and the power at each rotation speed are calculated by using the detected maximum current.
In step S303, while the cooling system fault is prompted, the temperature of the IGBT module of the motor controller is controlled to be lower than the damage temperature according to the preset maximum torque and the preset maximum power as the limit values of the motor controller.
That is to say, this application embodiment can be when cooling system breaks down, with the limiting value who presets maximum torque and predetermine maximum power as motor controller to make the temperature of IGBT module be less than the damage temperature, realize the protection to the IGBT module, and guarantee that the driver can drive the vehicle to the maintenance point and detect the maintenance, when improving whole car reliability, improve whole car security.
Optionally, in some embodiments, the method further comprises: collecting the actual temperature of the IGBT module; and if the actual temperature is higher than the preset temperature and no fault of the cooling system is detected, taking the preset maximum torque and the preset maximum power as actual limit values, and performing abnormity reminding.
It can be understood that if the cooling system has no fault, the actual temperature of the IGBT module is higher than the preset temperature, so that the embodiment of the application can perform abnormal reminding, such as prompting a driver to perform station entering maintenance, and avoiding the occurrence of damage of the IGBT module.
In order to further understand the thermal protection method of the IGBT module according to the embodiment of the present application, the following detailed description is made with reference to fig. 5 and 6.
As shown in fig. 5, fig. 5 is a block schematic diagram of a thermal protection system of an IGBT module according to the thermal protection method of the IGBT module according to the embodiment of the present application, where the thermal protection system of the IGBT module includes: the system comprises a vehicle control unit, an instrument, a motor controller, a water pump, a radiator, a fan and the like. The vehicle control unit detects a torque request of a driver, and when the torque required by the driver is larger than a certain value, the cooling system is controlled to start working, so that the generated heat can be timely dissipated. The radiator and the fan cool the cooling liquid. The instrument displays the system state and prompts the driver to enter the station for maintenance when the cooling system is in failure and the motor controller is in power limit.
As shown in fig. 6, the thermal protection method of the IGBT module includes the steps of:
and S601, electrifying the whole vehicle, and finishing initialization of each system.
S602, the driver READY prepares the vehicle to run.
S603, judging the torque demand of the driver, if the demanded torque is larger than a certain value (considering that the water pump needs a certain time to start, the torque value is smaller than T1), or the temperature of the system is higher.
And S604, the vehicle control unit requests the cooling system to start working.
And S605, judging whether the cooling system has faults, if so, executing the step S606, otherwise, executing the step S608.
S606, limiting the maximum available torque and power to T2, P2.
S607, the instrument prompts the fault of the cooling system and the limit power of the whole vehicle, and prompts the driver to enter the station for maintenance
And S608, starting the cooling system.
According to the thermal protection method for the IGBT module, whether a cooling system of a vehicle is in fault can be detected, when the cooling system is detected to be in fault, the current maximum torque and the current maximum power of a motor controller of the vehicle are respectively reduced to the preset maximum torque and the preset maximum power, the cooling system is prompted to be in fault, and meanwhile the temperature of the IGBT module of the motor controller is controlled to be lower than the damage temperature according to the preset maximum torque and the preset maximum power as the limiting values of the motor controller, so that the problem that thermal protection of the IGBT module cannot be effectively achieved in the related technology is solved, a driver can be guaranteed to drive the vehicle to a maintenance point to detect and maintain the cooling system in the state that the cooling system is not damaged, the reliability of the whole vehicle is improved, and meanwhile the safety of the whole vehicle is improved.
Next, a thermal protection device of an IGBT module proposed according to an embodiment of the present application is described with reference to the drawings.
Fig. 7 is a block schematic diagram of a thermal protection device of an IGBT module according to an embodiment of the present application.
As shown in fig. 7, the thermal protection device 10 of the IGBT module includes: a detection module 100, a first control module 200, and a second control module 300.
The detection module 100 is used for detecting whether a cooling system of the vehicle is failed;
the first control module 200 is configured to reduce a current maximum torque and a current maximum power of a motor controller of a vehicle to a preset maximum torque and a preset maximum power, respectively, when a cooling system fault is detected, wherein the preset maximum torque is smaller than the current maximum torque, and the preset maximum power is smaller than the current maximum power; and
the second control module 300 is configured to, while prompting the cooling system fault, control the temperature of the IGBT module of the motor controller to be lower than the damage temperature according to the preset maximum torque and the preset maximum power as the limit values of the motor controller.
Optionally, before reducing the current maximum torque and the current maximum power of the vehicle to the preset torque and the preset power, respectively, the first control module 200 further comprises:
the identification unit is used for identifying the maximum current meeting the temperature rise passing condition according to the temperature rise curve of the IGBT module when the cooling system stops working;
and the calculating unit is used for calculating preset torque and preset power at each rotating speed based on the maximum current.
Optionally, the method further comprises:
the acquisition module is used for acquiring the actual temperature of the IGBT module;
and the reminding module is used for taking the preset maximum torque and the preset maximum power as actual limiting values and carrying out abnormity reminding when the actual temperature is higher than the preset temperature and no fault of the cooling system is detected.
Optionally, the first control module 200 comprises:
the first acquisition unit is used for acquiring the actual speed of the electric automobile;
and the matching unit is used for matching the corresponding preset maximum torque and the preset maximum power according to the actual rotating speed.
Optionally, before detecting whether the cooling system of the vehicle is malfunctioning, the detection module 100 further includes:
the second acquisition unit is used for acquiring the current torque demand of the driver and the actual temperature of the IGBT module;
and the sending unit is used for sending a cooling request to the cooling system when the current torque demand is greater than a preset threshold value or the actual temperature is higher than a preset temperature.
It should be noted that the foregoing explanation of the embodiment of the thermal protection method for the IGBT module is also applicable to the thermal protection device for the IGBT module of this embodiment, and details are not repeated here.
According to the thermal protection device for the IGBT module, whether a cooling system of a vehicle is in fault can be detected, when the cooling system is detected to be in fault, the current maximum torque and the current maximum power of a motor controller of the vehicle are respectively reduced to the preset maximum torque and the preset maximum power, and when the cooling system is prompted to be in fault, the temperature of the IGBT module of the motor controller is controlled to be lower than the damage temperature according to the preset maximum torque and the preset maximum power as the limiting values of the motor controller, so that the problem that thermal protection of the IGBT module cannot be effectively realized in the related technology is solved, a driver can be guaranteed to drive the vehicle to a maintenance point to detect and maintain the fault of the cooling system in the state that the fault is not damaged, the reliability of the whole vehicle is improved, and the safety of the whole vehicle is improved.
In addition, as shown in fig. 8, the embodiment of the present application also proposes a vehicle 20, where the vehicle 20 includes the thermal protection device 10 of the IGBT module described above.
According to the vehicle provided by the embodiment of the application, the problem that thermal protection of the IGBT module cannot be effectively realized in the related art is solved through the thermal protection device of the IGBT module, so that a driver can drive the vehicle to a maintenance point to detect and maintain the fault of the cooling system in a state that the fault is not damaged, and the reliability of the whole vehicle is improved while the safety of the whole vehicle is improved.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of implementing the embodiments of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
Claims (10)
1. A thermal protection method of an IGBT module is characterized by comprising the following steps:
detecting whether a cooling system of a vehicle is malfunctioning;
when the cooling system fault is detected, respectively reducing the current maximum torque and the current maximum power of a motor controller of the vehicle to a preset maximum torque and a preset maximum power, wherein the preset maximum torque is smaller than the current maximum torque, and the preset maximum power is smaller than the current maximum power; and
and when the fault of the cooling system is prompted, controlling the temperature of an IGBT module of the motor controller to be lower than the damage temperature according to the preset maximum torque and the preset maximum power as the limit value of the motor controller.
2. The method of claim 1, further comprising, before reducing a current maximum torque and a current maximum power of the vehicle to the preset torque and the preset power, respectively:
when the cooling system stops working, identifying the maximum current meeting the temperature rise passing condition according to the temperature rise curve of the IGBT module;
and calculating the preset torque and preset power at each rotating speed based on the maximum current.
3. The method of claim 1, further comprising:
collecting the actual temperature of the IGBT module;
and if the actual temperature is higher than the preset temperature and no fault of the cooling system is detected, taking the preset maximum torque and the preset maximum power as the actual limit value, and performing exception reminding.
4. The method of claim 1, wherein reducing the current maximum torque and the current maximum power of a motor controller of the vehicle to a preset maximum torque and a preset maximum power, respectively, comprises:
acquiring the actual speed of the electric automobile;
and matching the corresponding preset maximum torque and the preset maximum power according to the actual rotating speed.
5. The method of claim 1, further comprising, prior to detecting whether a cooling system of the vehicle is malfunctioning:
acquiring the current torque demand of a driver and the actual temperature of the IGBT module;
and if the current torque demand is greater than a preset threshold value or the actual temperature is higher than a preset temperature, sending a cooling request to the cooling system.
6. A thermal protection device for an IGBT module, comprising:
the detection module is used for detecting whether a cooling system of the vehicle is in failure;
a first control module, configured to, when a failure of the cooling system is detected, reduce a current maximum torque and a current maximum power of a motor controller of the vehicle to a preset maximum torque and a preset maximum power, respectively, where the preset maximum torque is smaller than the current maximum torque, and the preset maximum power is smaller than the current maximum power; and
and the second control module is used for prompting the fault of the cooling system and controlling the temperature of an IGBT module of the motor controller to be lower than the damage temperature according to the preset maximum torque and the preset maximum power as the limit value of the motor controller.
7. The apparatus of claim 6, wherein the first control module, prior to reducing a current maximum torque and a current maximum power of the vehicle to the preset torque and the preset power, respectively, further comprises:
the identification unit is used for identifying the maximum current meeting the temperature rise passing condition according to the temperature rise curve of the IGBT module when the cooling system stops working;
and the calculating unit is used for calculating the preset torque and the preset power at each rotating speed based on the maximum current.
8. The apparatus of claim 6, further comprising:
the collection module is used for collecting the actual temperature of the IGBT module;
and the reminding module is used for taking the preset maximum torque and the preset maximum power as the actual limiting value and carrying out abnormity reminding when the actual temperature is higher than the preset temperature and the cooling system is detected to be free from faults.
9. The apparatus of claim 6, wherein the first control module comprises:
the first acquisition unit is used for acquiring the actual speed of the electric automobile;
and the matching unit is used for matching the corresponding preset maximum torque and the preset maximum power according to the actual rotating speed.
10. A vehicle, characterized by comprising: thermal protection device of an IGBT module according to any of claims 6-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113665371A (en) * | 2021-09-14 | 2021-11-19 | 上汽通用五菱汽车股份有限公司 | Electric drive system over-temperature protection method, vehicle and readable storage medium |
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