CN112054744B - Inverter temperature control method, system, vehicle and medium - Google Patents
Inverter temperature control method, system, vehicle and medium Download PDFInfo
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- CN112054744B CN112054744B CN202010986265.9A CN202010986265A CN112054744B CN 112054744 B CN112054744 B CN 112054744B CN 202010986265 A CN202010986265 A CN 202010986265A CN 112054744 B CN112054744 B CN 112054744B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
- H02P29/68—Controlling or determining the temperature of the motor or of the drive based on the temperature of a drive component or a semiconductor component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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Abstract
The invention discloses an inverter temperature control method, an inverter temperature control device, a vehicle and a medium. The method comprises the following steps: the sensing module acquires the rotating speed information of the motor; the torque control module acquires torque information of the motor; the power control module acquires temperature information of the inverter; the frequency control module determines a target frequency of the inverter according to the rotating speed information, the torque information and the temperature information; the frequency control module adjusts the frequency of the inverter to the target frequency to realize the control of the frequency of the inverter; the power control module controls the output frequency of the motor based on the target frequency, realizes the control of the temperature of the inverter, solves the problem that the power performance of the whole vehicle is changed due to the temperature change of the inverter, and realizes the effect that the temperature change of the inverter does not influence the power performance of the whole vehicle.
Description
Technical Field
The embodiment of the invention relates to an inverter technology, in particular to an inverter temperature control method, an inverter temperature control system, a vehicle and a medium.
Background
Pure electric vehicles and hybrid electric vehicles become the main form of future vehicles due to less pollution and emission and higher fuel economy. Power motors of pure electric vehicles and hybrid electric vehicles need high-power inverters to drive. Due to the characteristic limitation of the inverter module, when the motor outputs high-low-speed and high-torque, the temperature of the motor rises quickly, and if the temperature exceeds the safe working temperature of the inverter, the overall efficiency of the controller is influenced, and the service life and the safety of the inverter are seriously influenced.
In the prior art, after the phenomenon that the temperature of the inverter is overhigh is detected, the temperature rise of the inverter can be reduced by reducing the torque output of the motor. Although the purpose of cooling the inverter can be achieved in the prior art, the dynamic performance of the whole vehicle is reduced.
Disclosure of Invention
The invention provides an inverter temperature control method, an inverter temperature control system, a vehicle and a medium, which are used for controlling the temperature of an inverter.
In a first aspect, an embodiment of the present invention provides an inverter temperature control method, which is applied to a temperature control system, where the temperature control system includes: the device comprises a sensing module, a frequency control module, a power control module and a motor;
the method comprises the following steps:
the sensing module acquires the rotating speed information of the motor; the frequency control module acquires torque information of the motor; the power control module acquires temperature information of the inverter;
the frequency control module determines a target frequency of the inverter according to the rotating speed information, the torque information and the temperature information;
the frequency control module adjusts the frequency of the inverter to the target frequency to realize the control of the frequency of the inverter;
the power control module controls the output frequency of the motor based on the target frequency to achieve control over the temperature of the inverter.
In a second aspect, an embodiment of the present invention further provides an inverter temperature control system, where the system includes: the device comprises a sensing module, a frequency control module, a power control module and a motor;
the sensing module is used for acquiring the rotating speed information of the motor;
the frequency control module is used for acquiring torque information of the motor;
the power control module is used for acquiring temperature information of the inverter;
the frequency control module is used for determining the target frequency of the inverter according to the rotating speed information, the torque information and the temperature information;
the frequency control module is further configured to adjust the frequency of the inverter to the target frequency, so as to control the frequency of the inverter;
and the power control module is used for controlling the output frequency of the motor based on the target frequency to realize the control of the temperature of the inverter.
In a third aspect, an embodiment of the present invention further provides a vehicle, including:
one or more processors;
storage means for storing one or more programs;
an inverter temperature control system for controlling the temperature of the inverter;
when the one or more programs are executed by the one or more processors, the one or more processors are caused to implement the inverter temperature control method according to the first aspect.
In a fourth aspect, embodiments of the present invention also provide a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform the inverter temperature control method according to the first aspect.
The invention obtains the rotating speed information of the motor through the sensing module; the frequency control module acquires torque information of the motor; the power control module acquires temperature information of the inverter; the frequency control module determines a target frequency of the inverter according to the rotating speed information, the torque information and the temperature information; the frequency control module adjusts the frequency of the inverter to the target frequency to realize the control of the frequency of the inverter; the power control module controls the output frequency of the motor based on the target frequency, realizes the control of the temperature of the inverter, solves the problem that the power performance of the whole vehicle is changed due to the temperature change of the inverter, and realizes the effect that the temperature change of the inverter does not influence the power performance of the whole vehicle.
Drawings
Fig. 1 is a schematic structural diagram of a temperature control system for implementing an inverter temperature control method according to the present invention;
fig. 2 is a flowchart of an inverter temperature control method according to an embodiment of the present invention;
FIG. 3 is a plot of inverter active frequency control zones;
fig. 4 is a flowchart of an inverter temperature control method according to a second embodiment of the present invention;
FIG. 5 is a graph of inverter passive frequency switching based on temperature information;
FIG. 6 is a schematic diagram of inverter frequency switching as a function of driving mode;
FIG. 7 is a schematic diagram of inverter active frequency partition switching;
FIG. 8 is a schematic diagram of frequency hysteresis switching;
FIG. 9 is a schematic diagram of frequency linear switching;
fig. 10 is a schematic structural diagram of a vehicle according to a fourth 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 of the structures related to the present invention are shown in the drawings, not all of the structures.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but could have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like. In addition, the embodiments and features of the embodiments in the present invention may be combined with each other without conflict.
Fig. 1 is a schematic structural diagram of a temperature control system for executing a method for controlling inverter temperature according to the present invention, and as shown in fig. 1, the temperature control system may include: the device comprises a sensing module, a frequency control module, a power control module and a motor.
Wherein the sensor module may include a position sensor and a current sensor; the power control module may include a torque control module, a drive algorithm module, and a power module.
The position sensor is respectively and electrically connected with the motor, the torque control module, the driving algorithm module and the frequency control module; the current sensor is respectively electrically connected with the motor and the torque control module; the frequency control module is electrically connected with the position sensor, the driving algorithm sensor and the power sensor respectively; the torque control module is respectively and electrically connected with the position sensor, the current sensor and the driving algorithm sensor; the driving algorithm sensor is electrically connected with the position sensor, the torque control module, the frequency control module and the power module respectively; the power module is respectively and electrically connected with the driving algorithm module, the frequency control module, the motor and the inverter; the motor is respectively and electrically connected with the position sensor, the current sensor and the power module.
Specifically, the position sensor may include a motor rotor sensor, which may be configured to detect a position of a motor rotor and a rotation speed of the motor, and may include a resolver, an incremental encoder, and other types of position sensors; the current sensor can be a three-phase current sensor of the motor and can be used for detecting the three-phase current amplitude of the motor.
The torque control module may implement closed-loop control of torque based on the received torque request command and output 3-way multiple Pulse Width Modulation (PWM) duty cycles.
The frequency control module can determine the current frequency of the inverter according to the received torque request instruction, the rotating speed information of the motor, the torque information of the motor, the temperature information of the inverter and the like, output a frequency instruction and realize the control of the frequency of the inverter.
The driving algorithm module can output 6 paths of PWM driving signals capable of driving the power control module according to the 3 paths of PWM duty ratios output by the torque control module, and can also output fixed driving frequency according to the frequency instruction output by the frequency control module.
The power module can control the motor to output preset torque according to the received 6 paths of PWM driving signals, and meanwhile, the power control module can also detect real-time temperature information of the inverter and feed the temperature information back to the frequency control module.
The motor may comprise a drive motor, which may comprise a permanent magnet synchronous motor, an ac asynchronous motor, a dc brushless motor or an excited motor.
Example one
Fig. 2 is a flowchart of an inverter temperature control method according to an embodiment of the present invention, where the present embodiment is applicable to a situation where an inverter temperature is too high, which causes a decrease in vehicle dynamics, and the method may be executed by a temperature control system, where the temperature control system may include: the device comprises a sensing module, a frequency control module, a power control module and a motor;
as shown in fig. 2, the method may specifically include the following steps:
Specifically, the sensing module may include a motor rotor position sensor, which may be configured to detect a rotational speed of the motor and obtain rotational speed information of the motor.
Specifically, the frequency control module may obtain a torque request command, which may include torque information of the electric machine, which may include a torque at which the electric machine is operated.
The power module may include a power module, which may include a temperature sensor that may obtain real-time temperature information of the inverter.
Specifically, when the rotational speed of the motor is low and the torque is low, the motor may be controlled using a low carrier frequency, and when the rotational speed of the motor is high, the motor may be controlled using a high carrier frequency.
Fig. 3 is a sectional view of active frequency control of the inverter, and as shown in fig. 3, sectional frequency conversion control can be performed on the working condition of the motor.
When the motor is in a first region, that is, an extremely low rotation speed region, or a motor stalling region, the target frequency of the inverter may be controlled to be a first carrier frequency, and the first carrier frequency may be the lowest carrier frequency in the frequency control. It should be noted that the rotation speed of the region may include 0rpm to 50rpm, of course, the rotation speed region is not strictly defined and may be determined according to different motor conditions, and the rotation speed of the region may be defined as if the rotation speed of the motor is in the region. The first carrier frequency in this embodiment may include 1.25kHz, but is not limited to 1.25 kHz. The carrier frequency can be a fixed value or an extremely low carrier frequency value which changes along with the rotating speed of the motor.
When the motor is in a second region, namely a low-rotation-speed low-torque region, or a region including a common working condition in an urban area, the target frequency of the inverter can be controlled to be a second carrier frequency. It should be noted that the rotation speed in this region may include a region of 100rpm to 3500rpm, the torque region may include a region between 0Nm torque and 40% maximum torque, and the torque region may be defined as a region where the torque of the motor is in this region. The second carrier frequency in this embodiment may include 4.2kHz, but is not limited to 4.2 kHz. Similarly, the carrier frequency may be a fixed value, or may be a lower carrier frequency value that varies with the rotational speed of the motor.
It should be noted that the motor torque may refer to the magnitude of the rotating force. The torque of the motor is proportional to the strength of the rotating magnetic field and the current in the rotor cage bars, and is proportional to the square of the power supply voltage, so the torque can be determined by the current and the voltage.
When the motor is in the third region, i.e., the low rotational speed and medium torque region, the target frequency of the inverter may be controlled to the third carrier frequency. It should be noted that the zone rotation speed may be the same as the zone rotation speed of the second zone, that is, the zone rotation speed may include a range of 100rpm to 3500rpm, and the torque zone may include a range between 40% maximum torque and 80% maximum torque. The third carrier frequency in this embodiment may include 6kHz, but the second carrier frequency is not limited to 6 kHz. Similarly, the carrier frequency may be a fixed value, or may be a lower carrier frequency value that varies with the rotational speed of the motor.
And when the motor is in a fourth region, namely a high rotating speed region or a high torque region, controlling the target frequency of the inverter to be a fourth carrier frequency. It should be noted that the region of rotation speeds may include a region exceeding 3500rpm, and the torque region may exceed an 80% maximum torque region. The third carrier frequency in this embodiment may include 10kHz, but the second carrier frequency is not limited to 10 kHz. Similarly, the carrier frequency may be a fixed value, or may be a higher carrier frequency value that varies with the rotational speed of the motor.
Of course, it should be noted that, in the process of determining the target frequency of the inverter according to the rotation speed information and the torque information, if the detected temperature of the inverter is greater than the first preset temperature, the passive regulation mode is started, the frequency of the inverter may be regulated to the preset low frequency, and if the detected temperature of the inverter is less than the second preset temperature, the frequency of the inverter may be regulated to the preset high frequency.
And step 250, the frequency control module adjusts the frequency of the inverter to a target frequency to realize the control of the frequency of the inverter.
Specifically, the frequency control module may adjust the frequency of the inverter to a target frequency according to a difference between the current frequency and the target. The frequency control module can adjust the frequency of the inverter according to the determined target frequency to realize the control of the frequency of the inverter.
And step 260, the power control module controls the output frequency of the motor based on the target frequency to realize the control of the temperature of the inverter.
Specifically, after the frequency of the inverter is determined, the power control module may determine the driving frequency of the motor according to the target frequency output by the frequency control module, so as to control the inverter. When the frequency of the inverter is reduced, the loss of the inverter is reduced, the efficiency is improved, and meanwhile, the temperature of the inverter is reduced; as the frequency of the inverter increases, the loss of the inverter increases, the efficiency decreases, and the temperature of the inverter increases. The temperature of the inverter is changed by changing the frequency of the inverter on the premise of not influencing the power output of the motor.
According to the technical scheme of the embodiment, the rotating speed information of the motor is acquired through the sensing module; the frequency control module acquires torque information of the motor; the power control module acquires temperature information of the inverter; the frequency control module determines a target frequency of the inverter according to the rotating speed information, the torque information and the temperature information; the frequency control module adjusts the frequency of the inverter to the target frequency to realize the control of the frequency of the inverter; the power control module controls the output frequency of the motor based on the target frequency, realizes the control of the temperature of the inverter, solves the problem that the power performance of the whole vehicle is changed due to the temperature change of the inverter, and realizes the effect that the temperature change of the inverter does not influence the power performance of the whole vehicle.
Example two
Fig. 4 is a flowchart of an inverter temperature control method according to a second embodiment of the present invention, which is embodied on the basis of the second embodiment. In this embodiment, the method may further include:
and step 410, the sensing module acquires the rotating speed information of the motor.
The sensing module can comprise a position sensor and a current sensor, and the position sensor can be used for detecting the rotating speed of the motor and obtaining the rotating speed information of the motor; the current sensor may be used to detect three-phase current amplitudes of the motor. The three-phase current of the motor may include iu、ivAnd iw。
The details of the torque information obtained by the frequency control module are already explained in the first embodiment, and are not described herein again.
The power control module may include a torque control module, a drive algorithm module, and a power module. The power module can monitor the temperature of the inverter in real time and send temperature information to the frequency control module.
In one embodiment, step 440 may specifically include:
the frequency control module judges the current rotating speed based on the current rotating speed, the first rotating speed and the second rotating speed.
In particular, the rotational speed values or rotational speed ranges of the first rotational speed and the second rotational speed may be determined for different motor conditions. In this embodiment, the first rotation speed may include 0rpm to 50rpm, and the second rotation speed may include 100rpm to 3500 rpm. The region where the current rotation speed is located can be judged according to the rotation speed range.
The frequency control module determines a current torque based on the current torque, the first torque, and the second torque.
In particular, the torque values or torque regions of the first and second torques may be determined for different motor situations. In this embodiment, the first torque may comprise 40% torque capacity and the second torque may comprise 80% torque capacity. The region in which the current torque is located may be determined based on the torque range described above.
Among them, the maximum torque, which may be called a stop torque, is one of important characteristics of the motor. The torque that can be generated by the motor when the load is increased without a sudden drop in the rotational speed can be the maximum torque at the rated voltage and the rated frequency. The maximum torque can be determined according to different running conditions, and the minimum value of the maximum torque can be 1.6-2.5 times of the rated torque.
The frequency control module judges the current temperature based on the current temperature, the first threshold and the second threshold.
Specifically, if the current temperature is greater than the first threshold or less than the second threshold, the active adjustment of the inverter frequency by the rotational speed information and the torque information does not work any more, and the inverter frequency is passively controlled based on the current temperature.
Fig. 5 is a graph of inverter passive frequency switching based on temperature information, as shown in fig. 5, if the current temperature is greater than the first threshold, the frequency of the inverter is controlled to be a lower carrier frequency; and if the current temperature is less than the second threshold value, controlling the frequency of the inverter to be higher carrier frequency.
In one embodiment, step 450 may specifically include:
if the current rotating speed is less than or equal to the first rotating speed, the frequency control module determines that the target frequency is the first carrier frequency.
Specifically, if the current rotation speed is less than or equal to the first rotation speed, the motor may be in the first region, and the target frequency is determined to be the first carrier frequency.
The determination of the first carrier frequency has been described in detail in the first embodiment, and is not described herein again.
If the current rotating speed is greater than the first rotating speed and less than or equal to the second rotating speed, and the current torque is less than or equal to the first torque, the frequency control module determines that the target frequency is less than or equal to the second carrier frequency.
Specifically, if the current rotation speed is greater than the first rotation speed and less than or equal to the second rotation speed, and the current torque is less than or equal to the first torque, the motor may be in the second region, and the target frequency is determined to be less than or equal to the second carrier frequency.
The determination of the second carrier frequency has already been described in detail in the first embodiment, and is not described herein again.
If the current rotating speed is greater than the first rotating speed and less than or equal to the second rotating speed, and the current torque is greater than the first torque and less than or equal to the second torque, the frequency control module determines that the target frequency is less than or equal to the third carrier frequency.
Specifically, if the current rotation speed is greater than the first rotation speed and less than or equal to the second rotation speed, and the current torque is greater than the first torque and less than or equal to the second torque, the motor may be in a third region, and the target frequency is determined to be less than or equal to the third carrier frequency.
The determination of the third carrier frequency has been described in detail in the first embodiment, and is not described herein again.
If the current rotating speed is greater than the first rotating speed and less than or equal to the second rotating speed, and the current torque is greater than the first torque or the rotating speed of the motor is greater than the second rotating speed, the frequency control module determines that the target frequency is greater than or equal to the fourth carrier frequency.
Specifically, if the current rotation speed is greater than the first rotation speed and less than or equal to the second rotation speed, and the current torque is greater than the first torque or the rotation speed of the motor is greater than the second rotation speed, the motor may be in a fourth region, and it is determined that the target frequency is greater than or equal to the fourth carrier frequency.
The determination of the fourth carrier frequency has been described in detail in the first embodiment, and is not described herein again.
In another embodiment, step 450 may further include:
if the temperature is greater than the first threshold, the frequency control module determines the target frequency according to the comparison result of the preset low frequency and the current carrier frequency.
Specifically, if the inverter temperature is greater than the first threshold, the inverter may be switched to the low frequency mode. It is easy to understand that, in the low frequency mode, the target frequency may be determined according to a comparison result between the preset low frequency and the current carrier frequency.
If the preset low frequency is smaller than the current carrier frequency, determining the preset low frequency as a target frequency; and if the preset low frequency is greater than the current carrier frequency, determining the current carrier frequency as the target frequency.
And if the temperature is less than the second threshold, the frequency control module determines the target frequency according to the comparison result of the preset high frequency and the current carrier frequency.
Specifically, if the inverter temperature gradually decreases to be less than or equal to the second threshold, the inverter may be switched to the high frequency mode. It is easy to understand that, in the high frequency mode, the target frequency can be determined according to the comparison result between the preset high frequency and the current carrier frequency.
If the preset high frequency is smaller than the current carrier frequency, determining the preset high frequency as a target frequency; and if the preset high frequency is greater than the current carrier frequency, determining the current carrier frequency as the target frequency.
It should be noted that the inverter frequency can also be actively adjusted and controlled according to the change of the driving mode. The new energy automobile is similar to the traditional automobile in that the new energy automobile has driving modes such as a comfortable mode, a sport mode and an energy-saving mode. The frequency of the inverter can change along with the requirement of the driving mode of the whole vehicle, and the frequency of the inverter can be adjusted according to different driving modes by the active frequency conversion control method.
Fig. 6 is a schematic diagram of inverter frequency switching as a function of driving mode. As shown in fig. 6, when the entire vehicle is in the energy saving mode, the inverter frequency is controlled to curve 1, i.e., a lower frequency. The lower frequency can improve the efficiency of the inverter and improve the endurance mileage of the whole vehicle; when the whole vehicle is in a comfort mode or a sport mode, high requirements are placed on the control accuracy and the noise of an electric drive system (comprising a motor and an inverter), so that the frequency curve of the inverter is controlled to be a curve 2, namely a high frequency. The lower frequency and the higher frequency can be either constant or variable with the speed. In this embodiment, a lower frequency may be used as a value varying with the rotation speed, and a higher frequency may be used as a constant value.
The driving mode information may be input to a frequency control module that determines the inverter frequency based on the input driving mode information.
Specifically, fig. 7 is a schematic diagram of switching of the active frequency partition of the inverter, and a region enclosed by a dotted line shown in fig. 7 is a switching region.
And adjusting the rotating speed and the torque in the first, second, third and fourth areas according to the current frequency and the target frequency to realize the adjustment of the inverter frequency.
Preferably, fig. 8 is a schematic diagram of frequency hysteresis switching, fig. 9 is a schematic diagram of frequency linear switching, and as shown in fig. 8 and fig. 9, the preset switching manner may include: hysteretic switching and linear switching.
If the preset switching mode can comprise hysteresis switching, when the rotating speed or the torque of the motor is higher than a second rotating speed or a second torque, the frequency of the inverter is switched from the extremely low carrier frequency to the lower carrier frequency; when the motor speed or torque is lower than the first speed or the second speed, the inverter frequency is switched from a lower carrier frequency to an extremely low carrier frequency.
If the preset switching mode can comprise linear switching, when the motor is switched back and forth between the first area and the second area, the frequency of the inverter is linearly changed between the first carrier frequency and the second carrier frequency; when the motor is switched back and forth between the second area and the third area, the frequency of the inverter is linearly changed between the second carrier frequency and the third carrier frequency; the frequency of the inverter varies linearly between the third carrier frequency and the fourth carrier frequency as the motor switches back and forth between the third zone and the fourth zone.
In addition, the temperature switching may be realized by hysteresis switching or linear switching. In this embodiment, the temperature switching is hysteresis switching in fig. 5.
And 470, controlling the output frequency of the motor by the power control module based on the target frequency to realize the control of the temperature of the inverter.
The power control module may include a torque control module, a drive algorithm module, and a power module, and the torque control module may be responsive to a torque request command T* eMotor rotor position thetarMotor speed omegarThree-phase current i of motoru、ivAnd iwAnd outputs three paths of PWM duty ratios Ta、TbAnd Tc(ii) a The driving algorithm module can output 6 paths of PWM driving signals capable of driving the power module according to the 3 paths of PWM duty ratios output by the torque control module; the driving algorithm module can also output fixed PWM driving frequency according to the frequency instruction output by the frequency control module; the power module can control the output of the motor according to the received 6 paths of PWM driving signalsAnd outputting the torque and the output frequency to further realize the control of the temperature of the inverter.
According to the technical scheme of the embodiment, the rotating speed information of the motor is acquired through the sensing module; the frequency control module acquires torque information of the motor; the power control module acquires temperature information of the inverter; the frequency control module judges rotation speed information, torque information and temperature information respectively according to a preset rotation speed, a preset torque and a preset threshold value; the frequency control module determines the target frequency of the inverter based on the judgment results of the rotating speed information, the torque information and the temperature information; the frequency control module adjusts the frequency of the inverter to a target frequency based on a preset switching mode and the target frequency, so as to realize the control of the frequency of the inverter; the power control module controls the output frequency of the motor based on the target frequency, realizes the control of the temperature of the inverter, solves the problem that the power performance of the whole vehicle is changed due to the temperature change of the inverter, and realizes the effect that the temperature change of the inverter does not influence the power performance of the whole vehicle.
EXAMPLE III
Fig. 1 is a structural diagram of an inverter temperature control system according to a third embodiment of the present invention, where the system may be applied to a situation where the vehicle dynamics is reduced due to a decrease in temperature rise of an inverter caused by a decrease in motor torque output in the prior art. The device may be implemented by software and/or hardware, typically integrated in a vehicle system.
As shown in fig. 1, the system includes: a sensing module, a frequency control module, a power control module and a motor, wherein,
the sensing module is used for acquiring the rotating speed information of the motor;
the frequency control module is used for acquiring torque information of the motor;
the power control module is used for acquiring temperature information of the inverter;
the frequency control module is used for determining the target frequency of the inverter according to the rotating speed information, the torque information and the temperature information;
the frequency control module is further configured to adjust the frequency of the inverter to the target frequency, so as to control the frequency of the inverter;
and the power control module is used for controlling the output frequency of the motor based on the target frequency to realize the control of the temperature of the inverter.
In the inverter temperature control system provided by the embodiment, the sensing module is used for acquiring the rotating speed information of the motor; the frequency control module acquires torque information of the motor; the power control module acquires temperature information of the inverter; the frequency control module determines a target frequency of the inverter according to the rotation speed information, the torque information and the temperature information; the frequency control module adjusts the frequency of the inverter to the target frequency to realize the control of the frequency of the inverter; the power control module controls the output frequency of the motor based on the target frequency, realizes the control of the temperature of the inverter, solves the problem that the power performance of the whole vehicle is changed due to the temperature change of the inverter, and realizes the effect that the temperature change of the inverter does not influence the power performance of the whole vehicle.
On the basis of the above embodiment, the frequency control module is specifically configured to:
the frequency control module judges the rotation speed information, the torque information and the temperature information respectively according to a preset rotation speed, a preset torque and a preset threshold value;
in one embodiment, the determining the rotation speed information, the torque information, and the temperature information according to a preset rotation speed, a preset torque, and a preset threshold may specifically include:
the frequency control module judges the current rotating speed based on the current rotating speed, the first rotating speed and the second rotating speed;
the frequency control module judges the current torque based on the current torque, the first torque and the second torque;
the frequency control module judges the current temperature based on the current temperature, a first threshold and a second threshold.
The frequency control module determines a target frequency of the inverter based on the determination results of the rotational speed information, the torque information, and the temperature information.
In one embodiment, determining the target frequency of the inverter based on the determination results of the rotational speed information, the torque information, and the temperature information may specifically include:
if the current rotating speed is less than or equal to the first rotating speed, the frequency control module determines that the target frequency is a first carrier frequency;
if the current rotating speed is greater than the first rotating speed and less than or equal to the second rotating speed, and the current torque is less than or equal to the first torque, the frequency control module determines that the target frequency is less than or equal to the second carrier frequency;
if the current rotating speed is greater than the first rotating speed and less than or equal to the second rotating speed, and the current torque is greater than the first torque and less than or equal to the second torque, the frequency control module determines that the target frequency is less than or equal to a third carrier frequency;
if the current rotating speed is greater than the first rotating speed and less than or equal to the second rotating speed, and the current torque is greater than the first torque or the rotating speed of the motor is greater than the second rotating speed, the frequency control module determines that the target frequency is greater than or equal to a fourth carrier frequency.
In another embodiment, the determining the target frequency of the inverter based on the determination results of the rotational speed information, the torque information, and the temperature information may specifically include:
if the temperature is greater than a first threshold value, the frequency control module determines the target frequency according to a comparison result of a preset low frequency and the current carrier frequency;
and if the temperature is less than a second threshold, the frequency control module determines the target frequency according to a comparison result of a preset high frequency and the current carrier frequency.
On the basis of the foregoing embodiment, the power control module is specifically configured to:
and the frequency control module adjusts the frequency of the inverter based on a preset switching mode and the target frequency to realize the control of the frequency of the inverter.
Preferably, the preset switching manner includes: hysteretic switching and linear switching.
The inverter temperature control system provided by the embodiment of the invention can execute the inverter temperature control method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
Example four
Fig. 10 is a schematic structural diagram of a vehicle according to a fourth embodiment of the present invention, as shown in fig. 10, the vehicle includes a processor 1010, a memory 1020, and an inverter temperature control device 1030; the number of processors 1010 in the vehicle may be one or more, and one processor 1010 is taken as an example in fig. 10; the processor 1010, the memory 1020, and the inverter temperature control device 1030 in the vehicle may be connected by a bus or other means, and fig. 10 illustrates an example in which the processor, the memory 1020, and the inverter temperature control device are connected by a bus.
The memory 1020, which is a computer-readable storage medium, may be used to store software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the inverter temperature control method in the embodiments of the present invention (e.g., a sensing module, a frequency control module, a power control module, and a motor in the inverter temperature control apparatus). The processor 1010 executes various functional applications and data processing of the vehicle by executing software programs, instructions and modules stored in the memory 1020, that is, implements the inverter temperature control method described above.
The memory 1020 may mainly include a program storage area and a data storage area, wherein the program storage 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 1020 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 1020 may further include memory located remotely from the processor 1010, which may be connected to the vehicle over 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 inverter temperature control device may be used to control the temperature of the inverter.
The vehicle provided by the embodiment of the invention can execute the inverter temperature control method provided by the embodiment, and has corresponding functions and beneficial effects.
EXAMPLE five
An embodiment of the present invention further provides a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a method for controlling inverter temperature, where the method may be performed by a temperature control system, and the temperature control system may include: the device comprises a sensing module, a frequency control module, a power control module and a motor;
the method may specifically comprise the steps of:
the sensing module acquires the rotating speed information of the motor;
the frequency control module acquires torque information of the motor;
the power control module acquires temperature information of the inverter;
the frequency control module determines a target frequency of the inverter according to the rotating speed information, the torque information and the temperature information;
the frequency control module adjusts the frequency of the inverter to the target frequency to realize the control of the frequency of the inverter;
the power control module controls the output frequency of the motor based on the target frequency to achieve control over the temperature of the inverter.
Of course, the storage medium containing the 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 inverter temperature control method provided by any embodiment 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 also 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 above search apparatus, each included unit and module are merely divided according to functional logic, but are not limited to the above division as long as the 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. Those skilled in the art will appreciate that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements and substitutions will now be 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. The inverter temperature control method is applied to a temperature control system, and the temperature control system comprises the following steps: the device comprises a sensing module, a frequency control module, a power control module and a motor;
the method comprises the following steps:
the sensing module acquires the rotating speed information of the motor; the frequency control module acquires torque information of the motor; the power control module acquires temperature information of the inverter;
the frequency control module determines a target frequency of the inverter according to the rotating speed information, the torque information and the temperature information;
the frequency control module adjusts the frequency of the inverter to the target frequency to realize the control of the frequency of the inverter;
the power control module controls the output frequency of the motor based on the target frequency to realize the control of the temperature of the inverter;
wherein the frequency control module determines a target frequency of the inverter based on the rotational speed information, the torque information, and the temperature information, including:
in the process of determining the target frequency of the inverter according to the rotating speed information and the torque information, if the temperature is greater than a first threshold value, the frequency control module determines the target frequency according to a comparison result of a preset low frequency and a current carrier frequency;
and if the temperature is less than a second threshold, the frequency control module determines the target frequency according to a comparison result of a preset high frequency and the current carrier frequency.
2. The inverter temperature control method of claim 1, wherein the frequency control module determines a target frequency of the inverter based on the rotational speed information, the torque information, and the temperature information, comprising:
the frequency control module judges the rotation speed information, the torque information and the temperature information respectively according to a preset rotation speed, a preset torque and a preset threshold value;
the frequency control module determines a target frequency of the inverter based on determination results of the rotational speed information, the torque information, and the temperature information.
3. The inverter temperature control method according to claim 2, wherein the frequency control module determines the rotational speed information, the torque information, and the temperature information according to a preset rotational speed and a preset torque, respectively, and includes:
the frequency control module judges the current rotating speed based on the current rotating speed, the first rotating speed and the second rotating speed;
the frequency control module judges the current torque based on the current torque, the first torque and the second torque;
the frequency control module judges the current temperature based on the current temperature, a first threshold and a second threshold.
4. The inverter temperature control method of claim 2, wherein the frequency control module determines the target frequency of the inverter based on the determination of the rotational speed information, the torque information, and the temperature information, comprising:
if the current rotating speed is less than or equal to the first rotating speed, the frequency control module determines that the target frequency is a first carrier frequency;
if the current rotating speed is greater than the first rotating speed and less than or equal to the second rotating speed, and the current torque is less than or equal to the first torque, the frequency control module determines that the target frequency is less than or equal to the second carrier frequency;
if the current rotating speed is greater than the first rotating speed and less than or equal to the second rotating speed, and the current torque is greater than the first torque and less than or equal to the second torque, the frequency control module determines that the target frequency is less than or equal to a third carrier frequency;
and if the current rotating speed is greater than the first rotating speed and less than or equal to the second rotating speed, and the current torque is greater than the first torque or the rotating speed of the motor is greater than the second rotating speed, the frequency control module determines that the target frequency is greater than or equal to a fourth carrier frequency.
5. The inverter temperature control method of claim 2, wherein the frequency control module adjusts the frequency of the inverter to the target frequency to effect control of the inverter frequency, comprising:
the frequency control module adjusts the frequency of the inverter based on a preset switching mode and the target frequency, and the frequency of the inverter is controlled.
6. The inverter temperature control method according to claim 5, wherein the preset switching manner includes: hysteretic switching and linear switching.
7. An inverter temperature control system, comprising: the device comprises a sensing module, a frequency control module, a power control module and a motor;
the sensing module is used for acquiring the rotating speed information of the motor;
the frequency control module is used for acquiring torque information of the motor;
the power control module is used for acquiring temperature information of the inverter;
the frequency control module is used for determining the target frequency of the inverter according to the rotating speed information, the torque information and the temperature information;
the frequency control module is further configured to adjust the frequency of the inverter to the target frequency, so as to control the frequency of the inverter;
the power control module is used for controlling the output frequency of the motor based on the target frequency to realize the control of the temperature of the inverter;
determining a target frequency of the inverter based on the rotation speed information, the torque information and the temperature information, specifically including:
in the process of determining the target frequency of the inverter according to the rotating speed information and the torque information, if the temperature is greater than a first threshold value, the frequency control module determines the target frequency according to a comparison result of a preset low frequency and a current carrier frequency;
and if the temperature is less than a second threshold, the frequency control module determines the target frequency according to a comparison result of a preset high frequency and the current carrier frequency.
8. A vehicle, characterized in that the vehicle comprises:
one or more processors;
storage means for storing one or more programs;
an inverter temperature control system for controlling the temperature of the inverter;
when executed by the one or more processors, cause the one or more processors to implement the inverter temperature control method of any of claims 1-6.
9. A storage medium containing computer executable instructions for performing the inverter temperature control method of any one of claims 1-6 when executed by a computer processor.
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| CN202010986265.9A CN112054744B (en) | 2020-09-18 | 2020-09-18 | Inverter temperature control method, system, vehicle and medium |
| PCT/CN2021/116641 WO2022057650A1 (en) | 2020-09-18 | 2021-09-06 | Inverter temperature control method and system, vehicle, and medium |
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| CN112054744B (en) * | 2020-09-18 | 2022-07-05 | 中国第一汽车股份有限公司 | Inverter temperature control method, system, vehicle and medium |
| CN114465545A (en) * | 2022-02-23 | 2022-05-10 | 哈尔滨昇悦生物科技有限公司 | Power control method of frequency converter |
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| WO2022057650A1 (en) | 2022-03-24 |
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