阅读说明：本技术 电机系统效率提升系统、装置及车用永磁同步电机 (Motor system efficiency improving system and device and permanent magnet synchronous motor for vehicle ) 是由 罗继涛 潘善照 丁健 李育 于 2021-11-09 设计创作，主要内容包括：本发明公开一种电机系统效率提升系统、装置及车用永磁同步电机。电机系统效率提升系统包括CAN通信收发模块、转矩协调模块、变频控制模块以及电机控制模块,本发明先通过CAN通信收发模块接收整车控制器发送的指令信息,对所述指令信息进行解析,然后通过转矩协调模块对解析后的指令信息进行处理,获得目标指令信息,再通过变频控制模块对目标指令信息进行处理,获得频率信息和电流环控制参数信息,再通过电机控制模块根据目标指令信息对电机控制模式进行切换,并根据频率信息和电流环控制参数信息提升电机效率。本发明通过电机控制模块根据电流环控制参数信息实现电机的闭环控制,并且根据频率信息提高电机效率。(The invention discloses a motor system efficiency improving system, a motor system efficiency improving device and a permanent magnet synchronous motor for a vehicle. The invention relates to a motor system efficiency improving system which comprises a CAN communication transceiving module, a torque coordination module, a variable frequency control module and a motor control module. According to the invention, the motor control module realizes the closed-loop control of the motor according to the current loop control parameter information, and the motor efficiency is improved according to the frequency information.)

1. An electric machine system efficiency enhancement system, comprising: the device comprises a CAN communication transceiving module, a torque coordination module, a variable frequency control module and a motor control module;

the output end of the CAN communication transceiving module is connected with the input end of the torque coordination module, the output end of the torque coordination module is connected with the input end of the variable frequency control module, and the output end of the torque coordination module and the output end of the variable frequency control module are connected with the motor control module;

the CAN communication transceiving module is used for receiving the instruction information sent by the vehicle control unit, analyzing the instruction information and transmitting the analyzed instruction information to the torque coordination module;

the torque coordination module is used for processing the analyzed instruction information to obtain target instruction information and transmitting the target instruction information to the motor control module and the variable frequency control module;

the frequency conversion control module is used for processing the target instruction information, obtaining frequency information and current loop control parameter information, and transmitting the current loop control parameter information to the motor control module;

and the motor control module is used for switching the motor control modes according to the target instruction information and improving the motor efficiency according to the frequency information and the current loop control parameter information.

2. The electric machine system efficiency enhancement system of claim 1, wherein the variable frequency control module comprises: the device comprises a frequency conversion state decision module, a frequency request module and a parameter self-adaptive module;

the input end of the frequency conversion state decision module is connected with the output end of the torque coordination module, the output end of the frequency conversion state decision module is respectively connected with the input end of the frequency request module and the input end of the parameter self-adaption module, the output end of the frequency request module is respectively connected with the other input end of the parameter self-adaption module and the motor control module, and the output end of the parameter self-adaption module is connected with the motor control module;

the frequency conversion state decision module is used for receiving target instruction information sent by the torque coordination module, wherein the target instruction information comprises a motor rotating speed signal and a torque signal;

the frequency conversion state decision module is further configured to process the motor rotation speed signal and the torque signal to obtain a current frequency state signal, and transmit the motor rotation speed signal, the torque signal, and the current frequency state signal to the frequency request module;

the frequency request module is used for generating a frequency value according to the motor rotating speed signal, the torque signal and the current frequency state signal and transmitting the frequency value to the parameter self-adapting module and the motor control module;

and the parameter self-adapting module is used for generating parameter information according to the motor rotating speed signal and the frequency value and transmitting the parameter information to the motor control module.

3. The motor system efficiency enhancement system of claim 2, wherein the variable frequency state decision module is further configured to determine a current state based on the motor speed signal and the torque signal, and to determine a current frequency state signal based on the current state.

4. The electric machine system efficiency enhancement system of claim 3, wherein the current state comprises: a default state and a locked-rotor frequency-reducing state;

the frequency conversion state decision module is further used for setting the current frequency state signal as a first preset frequency state signal when entering a default state;

the frequency conversion state decision module is further configured to switch to a locked-rotor frequency conversion state when the torque signal is in a first preset torque range, the motor rotation speed signal is in a first preset rotation speed range and lasts for a first preset duration, and set the current frequency state signal as a second preset frequency state signal;

and the frequency conversion state decision module is also used for switching to the default state when the locked-rotor frequency conversion state is detected, and the motor rotating speed signal is in a second preset rotating speed range and lasts for a second preset time length.

5. The motor system efficiency enhancement system of claim 4, wherein the current state further comprises: a continuous frequency conversion state;

the frequency conversion state decision module is further configured to switch to a continuous frequency conversion state and set the current frequency state signal to be continuous frequency conversion if the motor speed signal is detected to be in a third preset speed range and last for a third preset duration while being in the default state;

the frequency conversion state decision module is further configured to switch to the default state when the continuous frequency conversion state is achieved and if the motor speed signal is detected to be in a fourth preset speed range and last for a fourth preset time duration.

6. The electric machine system efficiency enhancement system of claim 5, wherein the frequency request module is further configured to determine a frequency value based on the current frequency status signal when the current frequency status signal satisfies a predetermined frequency condition;

the frequency request module is further configured to determine the frequency value according to the motor speed signal and the torque signal when the current frequency state signal does not satisfy the preset frequency condition.

7. The electric machine system efficiency enhancement system of claim 6, wherein the frequency request module is further configured to set the frequency value to the second preset frequency status signal when the current frequency status signal is the second preset frequency status signal;

the frequency request module is further configured to set the frequency value as the first preset frequency state signal when the current frequency state signal is the first preset frequency state signal;

the frequency request module is further configured to enter a continuous frequency conversion state when the current frequency state signal is not the second preset frequency state signal or the first preset frequency state signal, and determine the frequency value by querying a preset continuous frequency conversion table according to the motor rotation speed signal and the torque signal.

8. The motor system efficiency enhancement system of claim 1, further comprising: the system comprises a signal processing module and a fault diagnosis module;

the signal processing module is respectively connected with the input end of the fault diagnosis module, the input end of the CAN communication transceiving module, the other input end of the variable frequency control module and the other input end of the motor control module, and the output end of the fault diagnosis module is respectively connected with the other input end of the torque coordination module and the other input end of the motor control module;

the signal processing module is used for receiving an electrical signal of the motor controller and transmitting the electrical signal to the fault diagnosis module;

the fault diagnosis module is used for diagnosing the electric signals, obtaining fault information and transmitting the fault information to the torque coordination module;

and the torque coordination module is further configured to process the analyzed instruction information according to the fault information to obtain target instruction information, and transmit the target instruction information to the motor control module and the variable frequency control module.

9. A permanent magnet synchronous motor for a vehicle, characterized in that the permanent magnet synchronous motor for a vehicle comprises the motor system efficiency improvement system according to any one of claims 1 to 8.

10. A motor system efficiency improving apparatus, characterized in that the motor system efficiency improving apparatus comprises an inverter and the permanent magnet synchronous motor for a vehicle according to claim 9;

the inverter is connected with the permanent magnet synchronous motor for the vehicle;

the motor control module is further used for controlling the switching frequency of the inverter so as to adjust the efficiency of the permanent magnet synchronous motor for the vehicle.

Technical Field

The invention relates to the technical field of motors, in particular to a motor system efficiency improving system and device and a permanent magnet synchronous motor for a vehicle.

Background

In recent years, the new energy automobile industry is rapidly developed, consumer groups are continuously expanded, particularly along with the rise of intelligent driving and intelligent networking concepts, the automobile purchasing groups tend to be young, the requirements of purchasers on the performance of the whole automobile are continuously improved, and meanwhile, more rigorous requirements on new energy driving experience and endurance mileage are provided. The new energy automobile in the aspect of endurance mileage can not be satisfied by consumers all the time, the cost of the whole automobile is restrained by the arrangement space through a mode of increasing the battery capacity, the driving motor is an electricity utilization part with the maximum power on the new energy automobile, the efficiency of a driving motor system is greatly concerned, and especially the improvement of the efficiency at a medium-low rotating speed is very important.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

Disclosure of Invention

The invention mainly aims to provide a motor system efficiency improving system, a motor system efficiency improving device and a vehicle permanent magnet synchronous motor, and aims to solve the technical problem that the efficiency of the vehicle permanent magnet synchronous motor cannot be improved in the prior art.

In order to achieve the above object, the present invention provides an efficiency improving system for a motor system, including: the device comprises a CAN communication transceiving module, a torque coordination module, a variable frequency control module and a motor control module;

the output end of the CAN communication transceiving module is connected with the input end of the torque coordination module, the output end of the torque coordination module is connected with the input end of the variable frequency control module, and the output end of the torque coordination module and the output end of the variable frequency control module are connected with the motor control module;

the CAN communication transceiving module is used for receiving the instruction information sent by the vehicle control unit, analyzing the instruction information and transmitting the analyzed instruction information to the torque coordination module;

the torque coordination module is used for processing the analyzed instruction information to obtain target instruction information and transmitting the target instruction information to the motor control module and the variable frequency control module;

the frequency conversion control module is used for processing the target instruction information, acquiring frequency information and current loop control parameter information, and transmitting the frequency information and the current loop control parameter information to the motor control module;

and the motor control module is used for switching the motor control modes according to the target instruction information and improving the motor efficiency according to the frequency information and the current loop control parameter information.

Optionally, the variable frequency control module includes: the device comprises a frequency conversion state decision module, a frequency request module and a parameter self-adaptive module;

the input end of the frequency conversion state decision module is connected with the output end of the torque coordination module, the output end of the frequency conversion state decision module is respectively connected with the input end of the frequency request module and the input end of the parameter self-adaption module, the output end of the frequency request module is respectively connected with the other input end of the parameter self-adaption module and the motor control module, and the output end of the parameter self-adaption module is connected with the motor control module;

the frequency conversion state decision module is used for receiving target instruction information sent by the torque coordination module, wherein the target instruction information comprises a motor rotating speed signal and a torque signal;

the frequency conversion state decision module is further configured to process the motor rotation speed signal and the torque signal to obtain a current frequency state signal, and transmit the motor rotation speed signal, the torque signal, and the current frequency state signal to the frequency request module;

the frequency request module is used for generating a frequency value according to the motor rotating speed signal, the torque signal and the current frequency state signal and transmitting the frequency value to the parameter self-adapting module and the motor control module;

and the parameter self-adapting module is used for generating parameter information according to the motor rotating speed signal and the frequency value and transmitting the parameter information to the motor control module.

Optionally, the frequency conversion state decision module is further configured to determine a current state according to the motor speed signal and the torque signal, and determine a current frequency state signal according to the current state.

Optionally, the current state includes: a default state and a locked-rotor frequency-reducing state;

the frequency conversion state decision module is further used for setting the current frequency state signal as a first preset frequency state signal when entering a default state;

the frequency conversion state decision module is further configured to switch to a locked-rotor frequency conversion state when the torque signal is in a first preset torque range, the motor rotation speed signal is in a first preset rotation speed range and lasts for a first preset duration, and set the current frequency state signal as a second preset frequency state signal;

and the frequency conversion state decision module is also used for switching to the default state when the locked-rotor frequency conversion state is detected, and the motor rotating speed signal is in a second preset rotating speed range and lasts for a second preset time length.

Optionally, the current state further includes: a continuous frequency conversion state;

the frequency conversion state decision module is further configured to switch to a continuous frequency conversion state and set the current frequency state signal to be continuous frequency conversion if the motor speed signal is detected to be in a third preset speed range and last for a third preset duration while being in the default state;

the frequency conversion state decision module is further configured to switch to the default state when the continuous frequency conversion state is achieved and if the motor speed signal is detected to be in a fourth preset speed range and last for a fourth preset time duration.

Optionally, the frequency request module is further configured to determine a frequency value according to the current frequency state signal when the current frequency state signal meets a preset frequency condition;

the frequency request module is further configured to determine the frequency value according to the motor speed signal and the torque signal when the current frequency state signal does not satisfy the preset frequency condition.

Optionally, the frequency request module is further configured to set the frequency value as the second preset frequency state signal when the current frequency state signal is the second preset frequency state signal;

the frequency request module is further configured to set the frequency value as the first preset frequency state signal when the current frequency state signal is the first preset frequency state signal;

the frequency request module is further configured to enter a continuous frequency conversion state when the current frequency state signal is not the second preset frequency state signal or the first preset frequency state signal, and determine the frequency value by querying a preset continuous frequency conversion table according to the motor rotation speed signal and the torque signal.

Optionally, the motor system efficiency improving system further comprises: the system comprises a signal processing module and a fault diagnosis module;

the signal processing module is respectively connected with the input end of the fault diagnosis module, the input end of the CAN communication transceiving module, the other input end of the variable frequency control module and the other input end of the motor control module, and the output end of the fault diagnosis module is respectively connected with the other input end of the torque coordination module and the other input end of the motor control module;

the signal processing module is used for receiving an electrical signal of the motor controller and transmitting the electrical signal to the fault diagnosis module;

the fault diagnosis module is used for diagnosing the electric signals, obtaining fault information and transmitting the fault information to the torque coordination module;

and the torque coordination module is further configured to process the analyzed instruction information according to the fault information to obtain target instruction information, and transmit the target instruction information to the motor control module and the variable frequency control module.

In order to achieve the above object, the present invention further provides a permanent magnet synchronous motor for a vehicle, which includes the motor system efficiency improving system as described above.

In order to achieve the above object, the present invention further provides an efficiency improving apparatus for a vehicle permanent magnet synchronous motor system, which includes an inverter and the vehicle permanent magnet synchronous motor as described above;

the inverter is connected with the permanent magnet synchronous motor for the vehicle;

the motor control module is further used for controlling the switching frequency of the inverter so as to adjust the efficiency of the permanent magnet synchronous motor for the vehicle.

The invention firstly receives the instruction information sent by the vehicle control unit through the CAN communication transceiver module, analyzes the instruction information, transmits the analyzed instruction information to the torque coordination module, processes the analyzed instruction information through the torque coordination module to obtain target instruction information, transmits the target instruction information to the motor control module and the variable frequency control module, processes the target instruction information through the variable frequency control module to obtain frequency information and current loop control parameter information, transmits the frequency information and the current loop control parameter information to the motor control module, and switches the motor control mode through the motor control module according to the target instruction information, and the motor efficiency is improved according to the frequency information and the current loop control parameter information. According to the invention, the target instruction information is processed through the variable frequency control module to obtain the current loop control parameter information, then the motor control module is used for realizing the closed-loop control of the motor according to the current loop control parameter information, and the motor efficiency is improved according to the frequency information.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a functional block diagram of a first embodiment of an efficiency enhancement system for an electric machine system according to the present invention;

FIG. 2 is a functional block diagram of a second embodiment of the efficiency enhancement system of the motor system of the present invention;

FIG. 3 is a signal flow diagram of the motor control module of the present invention;

FIG. 4 is a schematic diagram of a current state change of the frequency conversion state decision module according to the present invention;

FIG. 5 is a diagram illustrating a variation of a frequency value of a frequency request module according to the present invention;

FIG. 6 is a diagram of parameter information processing of the parameter adaptation module according to the present invention;

fig. 7 is a functional block diagram of a third embodiment of the efficiency improving system of a motor system according to the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	CAN communication transceiver module	302	Frequency request module
20	Torque coordination module	303	Parameter adaptive module
				30	Frequency conversion control module	50	Signal processing module
40	Motor control module	60	Fault diagnosis module
				301	Frequency conversion state decision module

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are 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 addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a motor system efficiency improving system.

Referring to fig. 1, fig. 1 is a functional block diagram of a first embodiment of an efficiency improving system of a motor system according to the present invention.

As shown in fig. 1, in the embodiment of the present invention, the efficiency improvement system of the motor system includes a CAN communication transceiver module 10, a torque coordination module 20, a frequency conversion control module 30, and a motor control module 40;

the output end of the CAN communication transceiver module 10 is connected with the input end of the torque coordination module 20, the output end of the torque coordination module 20 is connected with the input end of the variable frequency control module 30, and the output ends of the torque coordination module 20 and the variable frequency control module 30 are connected with the motor control module 40;

the CAN communication transceiver module 10 is configured to receive instruction information sent by the vehicle control unit, analyze the instruction information, and transmit the analyzed instruction information to the torque coordination module 20;

it should be noted that a Vehicle Control Unit (VCU) is a central Control Unit of the new energy Vehicle, and is the core of the entire Control system. In this embodiment, the CAN communication transceiver module 10 receives the command information sent by the vehicle control unit on the CAN bus.

It is understood that the command information in the present embodiment may include a motor control mode, motor speed information, torque information, speed information, and the like, which is not particularly limited in the present embodiment.

In a specific implementation, after the command information is analyzed, only the motor control mode, the motor speed information and the torque information are included in the analyzed command information.

The torque coordination module 20 is configured to process the analyzed instruction information to obtain target instruction information, and transmit the target instruction information to the motor control module 40 and the variable frequency control module 30;

it is understood that the target command information in the present embodiment may include a motor speed signal and a torque signal.

In a specific implementation, the torque coordination module 20 processes the analyzed torque information, performs final torque arbitration and coordination, and obtains a torque signal.

The frequency conversion control module 30 is configured to process the target instruction information, obtain frequency information and current loop control parameter information, and transmit the frequency information and the current loop control parameter information to the motor control module 40;

it should be noted that the frequency information refers to a frequency value corresponding to the current motor, and the current loop control parameter information refers to current loop PI parameter information, which may specifically include D-axis PI parameters Dxkp and Dxki and Q-axis PI parameters Qxkp and Qxki.

And the motor control module 40 is configured to switch a motor control mode according to the target instruction information, and control the motor efficiency according to the frequency information and the current loop control parameter information.

It can be understood that the target instruction information includes motor control mode information, so that the motor control mode can be switched, and the change of the motor speed and the motor torque can be realized through the switching of the motor control mode.

In specific implementation, the motor control module 40 outputs a three-phase PWM duty ratio after performing SVPWM processing by combining with an MTPA algorithm and a weak magnetic control algorithm based on a vector control principle, outputs PWM signals which are symmetrical in the middle and complementary in an upper bridge and a lower bridge through a CCU6 peripheral device of a main control chip Infineon TC277, and drives an insulated gate bipolar transistor IGBT output voltage in a 6-way inverter through a hardware, so as to finally implement closed-loop control of the permanent magnet synchronous motor for a vehicle.

In this embodiment, the efficiency improvement system of the motor system includes a CAN communication transceiver module, a torque coordination module, a frequency conversion control module and a motor control module, the embodiment first receives command information sent by the vehicle controller through the CAN communication transceiver module, analyzes the command information, transmits the analyzed command information to the torque coordination module, processes the analyzed command information through the torque coordination module to obtain target command information, transmits the target command information to the motor control module and the frequency conversion control module, processes the target command information through the frequency conversion control module to obtain frequency information and current loop control parameter information, transmits the frequency information and the current loop parameter information to the motor control module, and switches the motor control mode through the motor control module according to the target command information, and the motor efficiency is improved according to the frequency information and the current loop control parameter information. According to the embodiment, the target instruction information is processed through the frequency conversion control module to obtain the current loop control parameter information, then the motor control module is used for realizing the closed-loop control of the motor according to the current loop control parameter information, and the motor efficiency is improved according to the frequency information.

Further, referring to fig. 2, fig. 2 is a functional block diagram of a second embodiment of the efficiency improving system of the motor system according to the present invention.

As shown in fig. 2, the variable frequency control module 30 includes: a frequency conversion state decision module 301, a frequency request module 302 and a parameter self-adapting module 303;

the input end of the frequency conversion state decision module 301 is connected to the output end of the torque coordination module 20, the output end of the frequency conversion state decision module 301 is connected to the input end of the frequency request module 302 and the input end of the parameter adaptive module 303, the output end of the frequency request module 302 is connected to the other input end of the parameter adaptive module 303 and the motor control module 40, and the output end of the parameter adaptive module 303 is connected to the motor control module 40;

in a specific implementation, the frequency conversion state decision module 301 may be a frequency conversion control component, and the frequency conversion control component is composed of three running entities (runnable), specifically, a frequency conversion state decision module 301, a frequency request module 302, and a parameter adaptation module 303.

The frequency conversion state decision module 301 is configured to receive target instruction information sent by the torque coordination module 20, where the target instruction information includes a motor rotation speed signal and a torque signal;

the frequency conversion state decision module 301 is further configured to process the motor rotation speed signal and the torque signal to obtain a current frequency state signal, and transmit the motor rotation speed signal, the torque signal, and the current frequency state signal to the frequency request module 302;

further, referring to fig. 3, fig. 3 is a signal flow diagram of the motor control module according to the present invention.

As shown in fig. 3, FSD is a frequency conversion state decision module 301, PFR is a frequency request module 302, and PAR is a parameter adaptation module 303. SWC _ VF is a variable frequency control component, Velocity is a motor rotating speed signal, Torque is a Torque signal, PwmFreqState is a current frequency state signal, Freq is a frequency value, Dxkp and Dxki are D-axis PI parameters, and Qxkp and Qxki are Q-axis PI parameters.

In a specific implementation, the frequency conversion state decision module (FSD)301 may process the motor speed signal and the torque signal to obtain a current frequency state signal, where the processed motor speed signal and the processed torque signal are the same as the motor speed signal and the motor torque signal before the processing.

Further, in order to determine the current frequency state signal, in this embodiment, the frequency conversion state decision module 301 is further configured to determine a current state according to the motor speed signal and the torque signal, and determine the current frequency state signal according to the current state.

It should be noted that the current state may include: default state, locked-rotor down-conversion state and continuous frequency conversion state. The system automatically enters a state after being electrified in the default state, namely the system enters the default state as long as being electrified; the locked-rotor frequency-reducing state refers to a state that the torque is still output when the rotating speed of the motor is 0; the continuous frequency conversion state refers to a state that the current frequency is continuously changed.

It will be appreciated that there is a corresponding current frequency state signal for each current state, so the current frequency state signal can be determined from the current state.

Further, in order to accurately determine the current frequency state signal, in this embodiment, the frequency conversion state decision module 301 is further configured to set the current frequency state signal as a first preset frequency state signal when entering a default state;

the frequency conversion state decision module 301 is further configured to switch to a locked-rotor frequency-reduction state when the torque signal is in a first preset torque range, the motor rotation speed signal is in a first preset rotation speed range, and the first preset duration lasts, and set the current frequency state signal as a second preset frequency state signal;

the frequency conversion state decision module 301 is further configured to switch to the default state when the locked-rotor frequency conversion state is detected, where the torque signal is detected to be in a second preset torque range, and the motor speed signal is detected to be in a second preset speed range and lasts for a second preset duration.

Further, in this embodiment, the frequency conversion state decision module 301 is further configured to, when the current frequency state signal is in the default state, switch to a continuous frequency conversion state if the motor rotation speed signal is detected to be in a third preset rotation speed range and continues for a third preset time duration, and set the current frequency state signal to be a continuous frequency conversion;

the frequency conversion state decision module 301 is further configured to switch to the default state when the continuous frequency conversion state is detected, and if the motor rotation speed signal is detected to be in a fourth preset rotation speed range and last for a fourth preset time duration.

It should be noted that the first preset frequency state signal, the first preset torque range, the first preset rotation speed range, the first preset time length, the second preset frequency state signal, the second preset torque range, the second preset rotation speed range, the second preset time length, the third preset rotation speed range, the third preset time length, the fourth preset rotation speed range, and the fourth preset time length are all calibratable, that is, they may be changed according to actual situations, and the specific value is not specifically limited in this embodiment.

Further, referring to fig. 4, fig. 4 is a schematic diagram illustrating a current state change of the frequency conversion state decision module according to the present invention.

As shown in fig. 4, PW0 represents the default state, PW1 represents the locked down state, and PW2 represents the continuous conversion state.

In a specific implementation, the description may be made with reference to specific values in fig. 4, and this does not mean that the present embodiment is limited to only this case. As shown in fig. 4, after the system is powered on, a default state PW0 is automatically entered, and the current frequency state signal is set to 5 kHz; after the torque signal is greater than 200NM, the motor rotating speed signal is less than 50RPM and lasts for a period of time, entering a locked-rotor down-conversion state PW1, and setting the current frequency state signal to be 2 kHz; and returning to the default state PW0 after the torque signal is less than 50NM, the motor speed signal is greater than 200RPM, and the period of time is continued.

For the other branch, after the system is powered on, the default state PW0 is automatically entered, and the current frequency state signal is set to 5 kHz; after the motor rotating speed signal is greater than 300RPM and lasts for a period of time, entering a continuous frequency conversion state PW2, and setting the current frequency state signal to be continuous frequency conversion; after the motor speed signal is less than 250RPM for a period of time, it returns to the default state PW 0.

The frequency request module 302 is configured to generate a frequency value according to the motor speed signal, the torque signal, and the current frequency status signal, and transmit the frequency value to the parameter adaptation module 303 and the motor control module 40;

further, in order to determine a frequency value, in this embodiment, the frequency request module 302 is further configured to determine a frequency value according to the current frequency state signal when the current frequency state signal satisfies a preset frequency condition;

the frequency request module 302 is further configured to determine the frequency value according to the motor speed signal and the torque signal when the current frequency state signal does not satisfy the preset frequency condition.

Further, in order to accurately determine a frequency value, in this embodiment, the frequency request module 302 is further configured to set the frequency value as the second preset frequency state signal when the current frequency state signal is the second preset frequency state signal;

the frequency request module 302 is further configured to set the frequency value as the first preset frequency state signal when the current frequency state signal is the first preset frequency state signal;

the frequency request module 302 is further configured to enter a continuous frequency conversion state when the current frequency state signal is not the second preset frequency state signal or the first preset frequency state signal, and determine the frequency value by querying a preset continuous frequency conversion table according to the motor rotation speed signal and the torque signal.

Further, referring to fig. 5, fig. 5 is a schematic diagram illustrating a variation of the frequency value of the frequency request module according to the present invention.

As shown in FIG. 5, Freq represents the frequency value.

It is to be understood that the description can be made with reference to specific values in fig. 5, and the embodiment is not limited to this case. The change of the frequency value in fig. 5 can be explained based on the value in fig. 4, and first, it is determined whether the current frequency state signal is 2kHz, if so, the frequency value is 2kHz, if not, it is determined whether the current frequency state signal is 5kHz, if so, the frequency value is 5kHz, and if not, the continuous frequency conversion state is entered.

In specific implementation, a frequency value can be determined through a lookup table 1 according to a motor rotating speed signal and a torque signal, a horizontal axis in the table 1 represents the motor rotating speed signal, a vertical axis represents the torque signal, the table 1 only represents one condition, and a specific preset continuous frequency conversion meter needs to be provided with a motor rack for matching and calibration.

Table 1:

the parameter adaptive module 303 is configured to generate parameter information according to the motor rotation speed signal and the frequency value, and transmit the parameter information to the motor control module 40.

Further, referring to fig. 6, fig. 6 is a diagram illustrating parameter information processing of the parameter adaptation module according to the present invention.

As shown in fig. 6, the parameter adaptive module 303 may generate parameter information according to the motor rotation speed signal and the frequency value, and may specifically determine the parameter information by looking up a table, where the motor system with different specific values needs to carry a motor rack for matching calibration.

Further, referring to fig. 7, fig. 7 is a functional block diagram of a third embodiment of the efficiency improving system of the motor system according to the present invention.

As shown in fig. 7, the efficiency improving system of the motor system further includes: a signal processing module 50 and a fault diagnosis module 60;

the signal processing module 50 is respectively connected with an input end of the fault diagnosis module 60, an input end of the CAN communication transceiver module 10, another input end of the variable frequency control module 30, and another input end of the motor control module 40, and an output end of the fault diagnosis module 60 is respectively connected with another input end of the torque coordination module 20 and another input end of the motor control module 40;

the signal processing module 50 is configured to receive an electrical signal of a motor controller and transmit the electrical signal to the fault diagnosis module 60;

it is understood that the analog and digital signals of the controller hardware can be collected by the signal processing module 50 and converted into the physical quantity required by the system, i.e. the electrical signal.

The fault diagnosis module 60 is configured to diagnose the electrical signal, obtain fault information, and transmit the fault information to the torque coordination module 20;

the torque coordination module 20 is further configured to process the analyzed instruction information according to the fault information, obtain target instruction information, and transmit the target instruction information to the motor control module 40 and the frequency conversion control module 30.

It can be understood that the torque coordination module 20 processes the analyzed torque information, and performs final torque arbitration and coordination by combining the alarm and fault information output by the fault diagnosis module 60.

In a specific implementation, the torque coordination module 20 may perform power limiting or other processing on the analyzed command information according to the fault information to obtain the target command information.

In this embodiment, the frequency conversion control module comprises a frequency conversion state decision module, a frequency request module and a parameter adaptive module, and the present embodiment first receives target instruction information sent by the torque coordination module through the frequency conversion state decision module, where the target instruction information comprises a motor rotation speed signal and a torque signal, processes the motor rotation speed signal and the torque signal to obtain a current frequency state signal, and transmits the motor speed signal, the torque signal and the current frequency state signal to the frequency request module, then generating a frequency value according to the motor rotating speed signal, the torque signal and the current frequency state signal through a frequency request module, and transmitting the frequency value to a parameter self-adaptive module, generating parameter information according to the motor rotating speed signal and the frequency value through the parameter self-adaptive module, and transmitting the parameter information to the motor control module. The embodiment can accurately determine the parameter information through the control logic among the variable frequency state decision module, the frequency request module and the parameter self-adaptive module, thereby realizing the closed-loop control of the motor.

In order to achieve the above object, the present invention further provides a permanent magnet synchronous motor for a vehicle, which includes the above motor system efficiency improving system. The specific structure of the motor system efficiency improvement system refers to the above embodiments, and since the permanent magnet synchronous motor for the vehicle adopts all technical solutions of all the above embodiments, all beneficial effects brought by the technical solutions of the above embodiments are at least achieved, and are not repeated herein.

In order to achieve the above object, the present invention further provides an efficiency improving apparatus for a vehicle permanent magnet synchronous motor system, where the efficiency improving apparatus for a vehicle permanent magnet synchronous motor system includes an inverter and the vehicle permanent magnet synchronous motor as described above, and the inverter is connected to the vehicle permanent magnet synchronous motor; the motor control module is further used for controlling the switching frequency of the inverter so as to adjust the efficiency of the permanent magnet synchronous motor for the vehicle.

It can be understood that the inverter includes an insulated gate bipolar transistor IGBT, and the switching frequency of the IGBT can be controlled by the motor control module 40, and the higher the switching frequency is, the greater the loss is, the lower the efficiency of the permanent magnet synchronous motor for the vehicle is, and therefore, by reducing the switching frequency of the IGBT, the efficiency of the permanent magnet synchronous motor for the vehicle can be improved.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.