CN114928274A - Brushless direct current motor control system and vehicle - Google Patents
Brushless direct current motor control system and vehicle Download PDFInfo
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- CN114928274A CN114928274A CN202110142877.4A CN202110142877A CN114928274A CN 114928274 A CN114928274 A CN 114928274A CN 202110142877 A CN202110142877 A CN 202110142877A CN 114928274 A CN114928274 A CN 114928274A
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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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/04—Arrangements for controlling or regulating the speed or torque of more than one motor
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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
- H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
- H02P5/68—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more dc dynamo-electric motors
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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
- Y02T10/64—Electric machine technologies in electromobility
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- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a brushless direct current motor control system and a vehicle, wherein an MCU module and at least two brushless direct current drive circuits are arranged, a three-phase driver and a current commutation circuit are respectively arranged in each drive circuit, different three-phase drivers are connected with different current commutation circuits, different current commutation circuits are connected with different brushless direct current motors, the MCU module can simultaneously generate a plurality of brushless direct current motor control signals according to control requirements and send the different brushless direct current motor control signals to different brushless direct current drive circuits to control the different brushless direct current motors to rotate, so that at least two brushless direct current motors are controlled to operate by one MCU module. According to the invention, by sharing parts and adopting the MCU module for integrated control, wiring harnesses and assembly difficulty required by internal communication are reduced, the production cost is greatly reduced, the maintenance and the upgrade are easy, and meanwhile, the communication distance between boards can be reduced, so that the system delay is reduced, and the communication reliability is improved.
Description
Technical Field
The invention relates to an automobile electronic control technology, in particular to a brushless direct current motor control system and a vehicle.
Background
In the field of electronic control technology of automobiles, the prior art generally integrates a plurality of ECUs (electronic control units) in an automobile into a large integrated controller, and then controls the relevant motors to perform corresponding operations through the integrated controller. However, in the research on the technology of controlling a plurality of motors by one integrated controller, the control of a plurality of PMDCs (permanent magnet brushed direct current motors) by the integrated controller is mainly studied in the market, and since the PMDCs have a commutator, it is easy to realize that one integrated controller controls a plurality of PMDCs. In the field of automotive electronic control technology, BLDC (brushless direct current motors) are used, but in the prior art, a plurality of BLDC cannot be controlled by one integrated controller, so that it is difficult to apply a technology of controlling a plurality of motors by one integrated controller in the field of automotive electronic control technology using BLDC, which affects the integrated development of automotive electronic control.
Disclosure of Invention
The invention mainly aims to provide a brushless direct current motor control system and a vehicle, and aims to solve the problem that a plurality of brushless direct current motors cannot be controlled by one integrated controller in the prior art.
The invention is realized by the following technical scheme:
the utility model provides a brushless DC motor control system, brushless DC motor control system includes MCU module and two at least brushless DC drive circuit, the MCU module is used for generating brushless DC motor control signal, just the MCU module includes control signal output, control signal output connects two at least brushless DC drive circuit, and each brushless DC drive circuit connects a brushless DC motor, brushless DC drive circuit includes:
the three-phase driver is connected with a control signal output end of the MCU module and used for receiving the brushless direct current motor control signal output by the control signal output end and generating a brushless direct current motor driving signal according to the brushless direct current motor control signal; and
and the current reversing circuit is connected with the three-phase driver and used for receiving the driving signal of the brushless direct current motor and driving the connected brushless direct current motor to rotate according to the driving signal of the brushless direct current motor.
Further, the brushless dc motor control system further includes:
the brushless direct current motor rotation monitoring circuit is connected between the current reversing circuit and the MCU module and used for sensing the current on the current reversing circuit so as to generate a current sensing signal and sending the current sensing signal to the MCU module;
and the MCU module calculates the real-time rotation condition of the brushless direct current motor according to the current sensing signal and generates and/or adjusts the brushless direct current motor control signal according to the real-time rotation condition of the brushless direct current motor.
Further, the control signal output end is a PWM signal output end, and the brushless dc motor control signal is a PWM signal.
Further, brushless DC motor control system still includes at least one brush DC drive circuit, brush DC drive circuit is used for being connected with brush DC motor, the MCU module is still used for generating brush DC motor control signal, brush DC drive circuit includes:
and the two-phase driver is connected with the MCU module and used for receiving the control signal of the brushed direct current motor and generating a driving signal of the brushed direct current motor for driving the brushed direct current motor according to the control signal of the brushed direct current motor so as to drive the brushed direct current motor.
Furthermore, the MCU module comprises a main MCU, the main MCU comprises at least two control signal output ends, and each control signal output end is correspondingly connected with one path of the brushless direct current driving circuit.
Furthermore, the MCU module comprises a main MCU and at least one sub-MCU connected with the main MCU, the main MCU comprises a bus end and at least one control signal output end, and each control signal output end is correspondingly connected with one brushless direct current driving circuit;
each sub-MCU comprises a bus interface end and at least one sub-control signal output end, wherein the bus interface end is respectively connected with the bus end of the main MCU, each sub-control signal output end is correspondingly connected with one path of the brushless direct current driving circuit, the sub-MCU is used for acquiring a synchronous control signal output by the main MCU, generating a brushless direct current motor control signal corresponding to the brushless direct current driving circuit according to the synchronous control signal, and driving the brushless direct current motor correspondingly connected to rotate through the brushless direct current driving circuit.
Furthermore, the plurality of sub-MCUs are connected with the bus end of the main MCU through bus interface ends thereof, respectively.
Further, the sub-control signal output end is a PWM signal output end.
Further, the bus end of the main MCU is connected to the bus interface ends of the sub MCUs through a LIN bus.
Furthermore, the brushless direct current motor control system comprises four brushless direct current drive circuits, the MCU module comprises three sub-MCUs, and one of the brushless direct current drive circuits is connected with the control signal output end of the main MCU; and the other three brushless direct current driving circuits are connected with the sub control signal output ends of the three sub MCU.
Further, the brushless dc control system further includes:
the brushless direct current motor rotation monitoring circuit is connected between the current commutation circuit and the main MCU and used for sensing the current on the current commutation circuit so as to generate a current sensing signal and sending the current sensing signal to the main MCU;
and the main MCU calculates the real-time rotation condition of the brushless direct current motor according to the current sensing signal, and generates and/or adjusts the control signal of the brushless direct current motor according to the real-time rotation condition of the brushless direct current motor.
Further, the brushless dc motor rotation monitoring circuit includes:
the current sampling circuits are respectively connected with the current reversing circuit and are used for sampling the current on the current reversing circuit to obtain sampling current;
and the current sensing circuit is connected between the current sampling circuits and the main MCU and used for sensing the sampling current so as to obtain the current sensing signal and transmit the current sensing signal to the main MCU.
A vehicle comprising a brushless dc motor control system as described above.
Compared with the prior art, the brushless direct current motor control system provided by the invention has the advantages that the MCU module and the at least two brushless direct current driving circuits are arranged, the three-phase driver and the current reversing circuit are respectively arranged in each driving circuit, different three-phase drivers are connected with different current reversing circuits, different current reversing circuits are connected with different brushless direct current motors, the MCU module can simultaneously generate a plurality of brushless direct current motor control signals according to the control requirement and send the different brushless direct current motor control signals to different brushless direct current driving circuits so as to control the different brushless direct current motors to rotate, and therefore, the at least two brushless direct current motors are controlled to operate through the MCU module. According to the invention, through sharing parts and adopting the MCU module for integrated control, wiring harness and assembly difficulty required by internal communication are reduced, the production cost is greatly reduced, the maintenance and the upgrade are easy, and meanwhile, the communication distance between boards can be reduced, so that the system delay is reduced, and the communication reliability is improved.
Drawings
Fig. 1 is a schematic structural diagram of a brushless dc motor control system according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of an MCU module in a brushless dc motor control system according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a brushless dc motor control system according to a second embodiment of the present invention;
fig. 4 is a schematic diagram of the control principle of the brushless dc motor control system applied to the vehicle door control.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the following embodiments and the accompanying drawings.
Referring to fig. 1, a first embodiment provides a brushless dc motor control system including an MCU module 6 and at least two brushless dc driving circuits 3. The MCU module 6 is used for generating a brushless direct current motor control signal, the MCU module 6 comprises a control signal output end 11, the control signal output end 11 is connected with at least two brushless direct current drive circuits 3, and each brushless direct current drive circuit 3 is connected with a brushless direct current motor 1. The brushless dc drive circuit 3 comprises a three-phase driver 4 and a current commutation circuit 2. The three-phase driver 4 is connected with the control signal output end 11 of the MCU module 6, and is configured to receive the brushless dc motor control signal output by the control signal output end 11, and generate a brushless dc motor driving signal according to the brushless dc motor control signal. And the current commutation circuit 2 is connected to the three-phase driver 4, and is configured to receive the brushless dc motor driving signal and drive the connected brushless dc motor 1 to rotate according to the brushless dc motor driving signal. The brushless DC motor control system provided by the embodiment, through setting up an MCU module 6 and at least two independent brushless DC drive circuit 3, and set up a three-phase driver 4 and a current commutation circuit 2 respectively in every brushless DC drive circuit 3, different three-phase driver 4 connects different current commutation circuit 2, and different brushless DC motor 1 is connected to different current commutation circuit 2, thus, MCU module 6 can generate a plurality of brushless DC motor control signals simultaneously according to the control needs, and send different brushless DC motor control signals to different brushless DC drive circuit 3, in order to control different brushless DC motor 1 operation, thereby realize through the operation of two at least brushless DC motor 1 of MCU module 6 control. The three-phase driver 4 and the MCU module 6 are generally disposed independently of each other, but the three-phase driver 4 may be integrated into the MCU module 6.
In this embodiment, in order to monitor the rotation of the brushless dc motor 1 in real time, the brushless dc motor control system further includes a rotation monitoring circuit 5. The brushless direct current motor rotation monitoring circuit 5 is connected between the current commutation circuit 2 and the MCU module 6, and is used for inducing current on the current commutation circuit 2 to generate a current induction signal and sending the current induction signal to the MCU module 6. Then, the MCU module 6 calculates the real-time rotation of the brushless dc motor 1 according to the current sensing signal, and generates and/or adjusts a control signal of the brushless dc motor according to the real-time rotation of the brushless dc motor 1, so as to control the further rotation of the brushless dc motor 1.
In this embodiment, the control signal output terminal 11 is a PWM signal output terminal, so that the brushless dc motor control signal is a PWM signal. That is, the MCU module 6 sends the brushless dc motor control signal to the three-phase driver 4 in the form of a PWM signal to control the output of the three-phase driver 4.
In this embodiment, in order to control the conventional brushed dc motor 9 compatibly, the brushless dc motor control system further includes at least one brushed dc driving circuit 7, and the brushed dc driving circuit 7 is used for being connected to the brushed dc motor 9. The MCU module 6 is also used for generating a brush direct current motor control signal. At this time, the brushed dc driving circuit 7 includes a two-phase driver 8. The two-phase driver 8 is connected with the MCU module 6, and is configured to receive the control signal of the brushed dc motor, and generate a drive signal of the brushed dc motor for driving the brushed dc motor 9 according to the control signal of the brushed dc motor, so as to drive the brushed dc motor 9.
In this embodiment, the MCU module 6 includes a main MCU10, the main MCU10 includes at least two control signal output terminals 11, each control signal output terminal 11 is correspondingly connected to one of the brushless dc driving circuits 3, so as to respectively control one of the brushless dc motors 1 to rotate through the two control signal output terminals 11 of one of the main MCUs 10, thereby simultaneously controlling the two brushless dc motors 1.
Referring to fig. 2 and 3, a second embodiment provides another brushless dc motor control system based on the first embodiment. The brushless dc motor control system according to the second embodiment is based on the brushless dc motor control system according to the first embodiment, the MCU module 6 includes a main MCU10 and at least one sub MCU12 connected to the main MCU, the main MCU10 includes a bus terminal 13 and at least one control signal output terminal 11, and each control signal output terminal 11 is correspondingly connected to one of the brushless dc driving circuits 3. Each sub MCU12 includes a bus interface terminal 14 and at least one sub control signal output terminal 15 respectively connected to the bus terminal 13 of the main MCU10, each sub control signal output terminal 15 is correspondingly connected to one of the brushless dc driving circuits 3, the sub MCU12 is configured to obtain a synchronization control signal output by the main MCU10, generate a brushless dc motor control signal corresponding to the brushless dc driving circuit 3 according to the synchronization control signal, and drive the corresponding connected brushless dc motor 1 to rotate through the brushless dc driving circuit 3. The sub-control signal output terminal 11 may also be a PWM signal output terminal, and outputs a PWM-type brushless dc motor control signal.
Generally, one master MCU10 is connected to at least two sub MCUs 12 to send brushless dc motor control signals to at least two sub MCUs 12. The three-phase drivers 4 of different bldc driver circuits 3 are connected to different main MCUs 10 or sub MCUs 12 to receive bldc control signals from different main MCUs 10 or sub MCUs 12. The generation and transmission of the driving signal of the brushed direct current motor can also refer to the generation and transmission rule of the control signal of the brushless direct current motor, that is, after the main MCU10 generates the driving signal of the brushed direct current motor, the driving signal of the brushed direct current motor is transmitted to the two-phase driver 8 or to the sub MCU12, and then the sub MCU12 forwards the driving signal to the two-phase driver 8. Therefore, as with the three-phase driver 4, the two-phase driver 8 may be connected to both the main MCU10 and the sub MCU12 to receive the brushed dc motor driving signals. By arranging the MCU module 6 to comprise the main MCU10 and at least one sub MCU12, the number of the brushless direct current motors 1 which can be simultaneously controlled by the MCU module 6 can be expanded. Simultaneously, through giving different function location for main MCU10 and sub MCU12, main MCU10 and sub MCU12 can the differentiation configuration in the performance to reduce system configuration cost when expanding the brushless DC motor 1's that MCU module 6 can control simultaneously quantity. For example, since the main MCU10 needs to be responsible for generating and transmitting the brushless dc motor control signal, and the sub MCU12 only needs to forward the brushless dc motor control signal, it is ensured that the main MCU10 has sufficient calculation, analysis, and execution functions, and can analyze and process external data, and reduce the performance requirements of the sub MCU12, and the sub MCU12 is only provided with the execution function, and can forward the received brushless dc motor control signal to the corresponding three-phase driver 4. A 32-bit/128 MHz single chip may be used as the master MCU10 and an 8-bit/16 MHz single chip may be used as the slave MCU 12. The bus terminal 13 of the host MCU10 is connected to the bus interface terminal 14 of each sub MCU12 via the LIN bus 8. The LIN bus 8 is a low-cost serial communication network for a distributed electronic system of an automobile, and is a supplement to other automobile multi-path networks such as a Controller Area Network (CAN).
The brushless dc motor control system may include at least four brushless dc driving circuits 3, and the MCU module 6 may include three sub MCUs 12. One of the brushless dc driving circuits 3 is connected to the control signal output terminal 11 of the main MCU10, and the other three brushless dc driving circuits 3 are connected to the sub-control signal output terminals 15 of the three sub MCUs 12. Of course, by expanding the number of the sub MCUs 12, the number of the brushless dc motors 1 that can be controlled by the MCU module 6 at the same time can be further expanded.
In the second embodiment, the brushless dc motor control system may also include a brushless dc motor rotation monitoring circuit 5. The brushless dc motor rotation monitoring circuit 5 is connected between the current commutation circuit 2 and the main MCU10, and is configured to sense a current on the current commutation circuit 2 to generate a current sensing signal, and transmit the current sensing signal to the main MCU 10. The main MCU10 then calculates the real-time rotation of the brushless dc motor 1 according to the current sensing signal, and generates and/or adjusts the control signal of the brushless dc motor according to the real-time rotation of the brushless dc motor 1, so as to control the further rotation of the brushless dc motor 1.
In both embodiments, the current commutation circuit 2 may be a field effect transistor current commutation circuit. Meanwhile, in both embodiments, the rotation monitoring circuit of the brushless direct current motor can comprise a plurality of current sampling circuits and at least one current sensing circuit. The plurality of current sampling circuits 16 are respectively connected to the current commutation circuits 2, and are configured to sample the current in the connected current commutation circuits 2 to obtain a sampled current. The at least one current sensing circuit 17 is connected between the plurality of current sampling circuits 16 and the main MCU10, and is configured to sense a sampled current to obtain a current sensing signal and transmit the current sensing signal to the main MCU 10. In the case of using the brushless dc motor control system in the control of the vehicle door by the vehicle door controller 19 as shown in fig. 4, the current sampling circuit 9 is a shunt resistor 18, and the current on the current commutation circuit 2 is shunted by the shunt resistor 18 for the current sensing circuit 17 to sense. The current sensing circuit 17 may be specifically a hall current sensor.
The invention also provides a vehicle comprising any one of the brushless direct current motor control systems. The brushless direct current motor 1 at least comprises a first brushless direct current motor for controlling the opening and closing of the vehicle door and a second brushless direct current motor for controlling the opening of the vehicle window. The brushless direct current motor control system provided by the invention can perform distributed electronic control on an automobile, and cooperatively control automobile parts such as automobile windows, door locks, skylights, rearview mirrors and the like on the automobile, which are driven by the brushless direct current motor 1, so as to realize the cooperation of automobile ECU (electronic control unit) capabilities.
The above-described embodiments are merely preferred embodiments, which are not intended to limit the scope of the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (13)
1. The utility model provides a brushless DC motor control system, its characterized in that brushless DC motor control system includes MCU module and two at least brushless DC drive circuit, the MCU module is used for generating brushless DC motor control signal, just the MCU module includes the control signal output part, the control signal output part is connected two at least brushless DC drive circuit, and each brushless DC drive circuit connects a brushless DC motor, brushless DC drive circuit includes:
the three-phase driver is connected with the control signal output end of the MCU module and used for receiving the brushless direct current motor control signal output by the control signal output end and generating a brushless direct current motor driving signal according to the brushless direct current motor control signal; and
and the current reversing circuit is connected with the three-phase driver and used for receiving the driving signal of the brushless direct current motor and driving the connected brushless direct current motor to rotate according to the driving signal of the brushless direct current motor.
2. The brushless dc motor control system of claim 1, further comprising:
the brushless direct current motor rotation monitoring circuit is connected between the current reversing circuit and the MCU module and used for sensing the current on the current reversing circuit so as to generate a current sensing signal and sending the current sensing signal to the MCU module;
and the MCU module calculates the real-time rotation condition of the brushless direct current motor according to the current sensing signal and generates and/or adjusts the control signal of the brushless direct current motor according to the real-time rotation condition of the brushless direct current motor.
3. The brushless dc motor control system of claim 1, wherein the control signal output is a PWM signal output, and the brushless dc motor control signal is a PWM signal.
4. The brushless dc motor control system of claim 1, further comprising at least one brushed dc drive circuit, the brushed dc drive circuit configured to couple to a brushed dc motor, the MCU module further configured to generate brushed dc motor control signals, the brushed dc drive circuit comprising:
and the two-phase driver is connected with the MCU module and used for receiving the control signal of the brushed direct current motor and generating a driving signal of the brushed direct current motor for driving the brushed direct current motor according to the control signal of the brushed direct current motor so as to drive the brushed direct current motor.
5. The brushless dc motor control system of claim 1, wherein the MCU module comprises a main MCU, the main MCU comprises at least two of the control signal output terminals, and each of the control signal output terminals is connected to one of the plurality of the brushless dc driving circuits.
6. The brushless direct current motor control system of claim 1, wherein the MCU module comprises a main MCU and at least one sub MCU connected to the main MCU, the main MCU comprises a bus terminal and at least one of the control signal output terminals, and each of the control signal output terminals is connected to one of the brushless direct current driving circuits;
each sub-MCU comprises a bus interface end and at least one sub-control signal output end, wherein the bus interface end is respectively connected with the bus end of the main MCU, each sub-control signal output end is correspondingly connected with one path of the brushless direct current driving circuit, the sub-MCU is used for acquiring a synchronous control signal output by the main MCU, generating a brushless direct current motor control signal corresponding to the brushless direct current driving circuit according to the synchronous control signal, and driving the brushless direct current motor correspondingly connected to rotate through the brushless direct current driving circuit.
7. The brushless dc motor control system of claim 6, wherein the sub-MCU includes a plurality of sub-MCUs respectively connected to the bus terminal of the main MCU through bus interface terminals thereof.
8. The brushless dc motor control system of claim 6, wherein the sub-control signal output is a PWM signal output.
9. The brushless dc motor control system of claim 6, wherein the bus terminal of the master MCU is connected to the bus interface terminals of the respective sub MCUs through a LIN bus.
10. The brushless dc motor control system according to claim 6, wherein the brushless dc motor control system comprises four of the brushless dc driving circuits, the MCU module comprises three of the sub-MCUs, and one of the brushless dc driving circuits is connected to the control signal output terminal of the main MCU; and the other three brushless direct current driving circuits are connected with the sub control signal output ends of the three sub MCU.
11. The brushless dc motor control system of claim 6, further comprising:
the brushless direct current motor rotation monitoring circuit is connected between the current commutation circuit and the main MCU and used for sensing the current on the current commutation circuit so as to generate a current sensing signal and sending the current sensing signal to the main MCU;
and the main MCU calculates the real-time rotation condition of the brushless direct current motor according to the current sensing signal, and generates and/or adjusts the control signal of the brushless direct current motor according to the real-time rotation condition of the brushless direct current motor.
12. The brushless dc motor control system of claim 11, wherein the brushless dc motor rotation monitoring circuit comprises:
the current sampling circuits are respectively connected with the current reversing circuit and are used for sampling the current on the current reversing circuit to obtain sampling current;
and the current sensing circuit is connected between the current sampling circuits and the main MCU and used for sensing the sampling current so as to obtain the current sensing signal and transmit the current sensing signal to the main MCU.
13. A vehicle comprising the brushless dc motor control system of any one of claims 1 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110142877.4A CN114928274A (en) | 2021-02-02 | 2021-02-02 | Brushless direct current motor control system and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110142877.4A CN114928274A (en) | 2021-02-02 | 2021-02-02 | Brushless direct current motor control system and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114928274A true CN114928274A (en) | 2022-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110142877.4A Withdrawn CN114928274A (en) | 2021-02-02 | 2021-02-02 | Brushless direct current motor control system and vehicle |
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| Country | Link |
|---|---|
| CN (1) | CN114928274A (en) |
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2021
- 2021-02-02 CN CN202110142877.4A patent/CN114928274A/en not_active Withdrawn
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