Motor system efficiency enhancement system, device and vehicle permanent magnet synchronous motor

Abstract

The application discloses a motor system efficiency improving system, device and vehicle permanent magnet synchronous motor. The motor system efficiency improving system comprises a CAN communication transceiving module, a torque coordination module, a variable frequency control module and a motor control module. The application receives instruction information sent by a vehicle controller through the CAN communication transceiving module, analyzes the instruction information, processes the analyzed instruction information through the torque coordination module, obtains target instruction information, processes the target instruction information through the variable frequency control module, obtains frequency information and current loop control parameter information, switches the motor control mode according to the target instruction information through the motor control module, and improves the motor efficiency according to the frequency information and the current loop control parameter information. The application realizes closed-loop control of the motor according to the current loop control parameter information through the motor control module, and improves the motor efficiency according to the frequency information.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an electric machine system efficiency improving system, device and vehicle permanent magnet synchronous electric machine. BACKGROUND

[0002] In recent years, the new energy vehicle industry has developed rapidly, and the consumer group has expanded continuously. Especially with the rise of intelligent driving and intelligent networking concepts, the car purchasing group tends to be younger, and the purchasers' requirements for vehicle performance are continuously improving. At the same time, more stringent requirements are put forward for new energy driving experience and range. The range of new energy vehicles has always been unsatisfactory to consumers. Increasing the battery capacity is restricted by the vehicle cost and the arrangement space. The drive motor is the largest power consumption component on the new energy vehicle, and the efficiency of the drive motor system is of great concern, especially the improvement of the efficiency at low speed.

[0003] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0004] The main purpose of the present application is to provide an electric machine system efficiency improving system, device and vehicle permanent magnet synchronous electric machine, which aims to solve the technical problem that the efficiency of the vehicle permanent magnet synchronous electric machine cannot be improved in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides an electric machine system efficiency improving system, which comprises a CAN communication transceiver module, a torque coordination module, a frequency control module and a motor control module.

[0006] The output end of the CAN communication transceiver 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 frequency control module, and the output end of the torque coordination module and the output end of the frequency control module are connected with the motor control module.

[0007] The CAN communication transceiver module is used for receiving the instruction information sent by the vehicle controller, analyzing the instruction information, and transmitting the analyzed instruction information to the torque coordination module.

[0008] The torque coordination module is used for processing the analyzed instruction information, obtaining target instruction information, and transmitting the target instruction information to the motor control module and the frequency control module.

[0009] The frequency control module is used for processing the target instruction information, obtaining 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.

[0010] The motor control module is configured to switch a motor control mode according to the target instruction information, and improve motor efficiency according to the frequency information and the current loop control parameter information.

[0011] Optionally, the variable frequency control module comprises a variable frequency state decision module, a frequency request module, and a parameter adaptive module.

[0012] The input end of the variable frequency state decision module is connected with the output end of the torque coordination module, the output end of the variable frequency state decision module is connected with the input end of the frequency request module and the input end of the parameter adaptive module respectively, the output end of the frequency request module is connected with another input end of the parameter adaptive module and the motor control module respectively, and the output end of the parameter adaptive module is connected with the motor control module.

[0013] The variable frequency state decision module is configured to receive the target instruction information sent by the torque coordination module, and the target instruction information comprises a motor speed signal and a torque signal.

[0014] The variable frequency state decision module is further configured to process the motor speed signal and the torque signal to obtain a current frequency state signal, and transmit the motor speed signal, the torque signal, and the current frequency state signal to the frequency request module.

[0015] The frequency request module is configured to generate a frequency value according to the motor speed signal, the torque signal, and the current frequency state signal, and transmit the frequency value to the parameter adaptive module and the motor control module.

[0016] The parameter adaptive module is configured to generate parameter information according to the motor speed signal and the frequency value, and transmit the parameter information to the motor control module.

[0017] Optionally, the variable frequency 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.

[0018] Optionally, the current state comprises a default state and a locked-rotor frequency reduction state.

[0019] The variable frequency state decision module is further configured to set the current frequency state signal as a first preset frequency state signal when entering the default state.

[0020] The variable frequency state decision module is further configured to switch to a locked-rotor frequency reduction state and set the current frequency state signal as a second preset frequency state signal when the torque signal is in a first preset torque range, the motor speed signal is in a first preset speed range, and the first preset torque range and the first preset speed range are maintained for a first preset time duration.

[0021] The variable frequency state decision module is further configured to switch to the default state when the locked-rotor frequency reduction state is maintained and the torque signal is in a second preset torque range, the motor speed signal is in a second preset speed range, and the second preset torque range and the second preset speed range are maintained for a second preset time duration.

[0022] Optionally, the current state further includes a continuous variable frequency state.

[0023] The variable frequency state decision module is further configured to switch to a continuous variable frequency state and set the current frequency state signal as the continuous variable frequency when the default state is maintained and the motor speed signal is in a third preset speed range and maintained for a third preset time duration.

[0024] The variable frequency state decision module is further configured to switch to the default state when the continuous variable frequency state is maintained and the motor speed signal is in a fourth preset speed range and maintained for a fourth preset time duration.

[0025] 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.

[0026] 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 meet the preset frequency condition.

[0027] 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.

[0028] 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.

[0029] The frequency request module is further configured to enter a continuous variable frequency state and determine the frequency value by querying a preset continuous variable frequency table according to the motor speed signal and the torque signal when the current frequency state signal is neither the second preset frequency state signal nor the first preset frequency state signal.

[0030] Optionally, the motor system efficiency improvement system further includes a signal processing module and a fault diagnosis module.

[0031] The signal processing module is connected with the input end of the fault diagnosis module, the input end of the CAN communication transceiver module, another input end of the frequency conversion control module and another input end of the motor control module respectively, and the output end of the fault diagnosis module is connected with another input end of the torque coordination module and another input end of the motor control module respectively;

[0032] The signal processing module is used for receiving an electrical signal of a motor controller and transmitting the electrical signal to the fault diagnosis module.

[0033] The fault diagnosis module is used for diagnosing the electrical signal, obtaining fault information and transmitting the fault information to the torque coordination module.

[0034] The torque coordination module is further used for processing the parsed instruction information according to the fault information, obtaining target instruction information and transmitting the target instruction information to the motor control module and the frequency conversion control module.

[0035] To achieve the above object, the application further provides a vehicle permanent magnet synchronous motor, which comprises the motor system efficiency improving system as described above.

[0036] To achieve the above object, the application further provides a vehicle permanent magnet synchronous motor system efficiency improving device, which comprises an inverter and the vehicle permanent magnet synchronous motor as described above.

[0037] The inverter is connected with the vehicle permanent magnet synchronous motor.

[0038] The motor control module is further used for controlling the switching frequency of the inverter to adjust the efficiency of the vehicle permanent magnet synchronous motor.

[0039] In the application, the motor system efficiency improving system comprises a CAN communication transceiver module, a torque coordination module, a variable frequency control module and a motor control module, the application first receives the instruction information sent by the vehicle controller through the CAN communication transceiver module, analyzes the instruction information, and transmits the analyzed instruction information to the torque coordination module, then processes the analyzed instruction information through the torque coordination module, obtains target instruction information, and transmits the target instruction information to the motor control module and the variable frequency control module, then processes the target instruction information through the variable frequency control module, obtains frequency information and current loop control parameter information, and transmits the frequency information and the current loop control parameter information to the motor control module, then switches the motor control mode according to the target instruction information through the motor control module, and improves the motor efficiency according to the frequency information and the current loop control parameter information. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0041] Figure 1 The functional module diagram of the first embodiment of the motor system efficiency improving system of the present application;

[0042] Figure 2 The functional module diagram of the second embodiment of the motor system efficiency improving system of the present application;

[0043] Figure 3 The signal flow direction diagram of the motor control module of the present application;

[0044] Figure 4 The current state change diagram of the variable frequency state decision module of the present application;

[0045] Figure 5 The frequency value change diagram of the frequency request module of the present application;

[0046] Figure 6 The parameter information processing diagram of the parameter adaptive module of the present application;

[0047] Figure 7 The functional module diagram of the third embodiment of the motor system efficiency improving system of the present application.

[0048] BRIEF DESCRIPTION OF DRAWINGS

[0049] Reference Name Reference Name 10 CAN communication transceiver module 302 Frequency request module 20 Torque coordination module 303 Parameter adaptive module 30 Variable frequency control module 50 Signal processing module 40 Motor control module 60 Fault diagnosis module 301 Variable frequency state decision module

[0050] The objectives, features and advantages of the present application will be further illustrated with reference to the embodiments, with reference to the drawings. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be apparently and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.

[0052] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings). If the certain posture changes, the directionality indications also change accordingly.

[0053] In addition, the description of “first”, “second” and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first”, “second” can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0054] The present application provides a motor system efficiency improvement system.

[0055] Referring to Figure 1 , Figure 1 is a functional module diagram of the first embodiment of the motor system efficiency improvement system of the present application.

[0056] As Figure 1 shown in the embodiments of the present application, the motor system efficiency improvement system comprises a CAN communication transceiver module 10, a torque coordination module 20, a variable frequency control module 30 and a motor control module 40.

[0057] 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 frequency control module 30, and the output end of the torque coordination module 20 and the output end of the frequency control module 30 are connected with the motor control module 40.

[0058] The CAN communication transceiver module 10 is used for receiving instruction information sent by the vehicle controller, analyzing the instruction information, and transmitting the analyzed instruction information to the torque coordination module 20.

[0059] It should be noted that the vehicle controller (VCU) is a new energy vehicle central control unit and is the core of the entire control system. In the embodiment, the CAN communication transceiver module 10 receives instruction information sent by the vehicle controller on the CAN bus.

[0060] It can be understood that the instruction information in the embodiment can include motor control mode, motor speed information, torque information, speed information, etc., which are not specifically limited in the embodiment.

[0061] In specific implementation, after the instruction information is analyzed, only the motor control mode, motor speed information and torque information are included in the analyzed instruction information.

[0062] The torque coordination module 20 is used for processing the analyzed instruction information, obtaining target instruction information, and transmitting the target instruction information to the motor control module 40 and the frequency control module 30.

[0063] It can be understood that the target instruction information in the embodiment can include motor speed signals and torque signals.

[0064] In specific implementation, the torque coordination module 20 processes the analyzed torque information, makes final torque arbitration and coordination, and obtains torque signals.

[0065] The frequency control module 30 is used for processing the target instruction information, obtaining 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 40.

[0066] It should be noted that the frequency information refers to the frequency value corresponding to the current motor, and the current loop control parameter information refers to the current loop PI parameter information, which can specifically include D-axis PI parameters Dxkp, Dxki and Q-axis PI parameters Qxkp, Qxki.

[0067] The motor control module 40 is configured to switch the 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.

[0068] 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 motor speed and torque can be changed through the switching of the motor control mode.

[0069] In a specific implementation, the motor control module 40 outputs three-phase PWM duty cycles after SVPWM processing based on the vector control principle combined with MTPA algorithm and field weakening control algorithm, outputs intermediate symmetrical and complementary PWM signals of upper and lower bridges through the CCU6 peripheral of the main control chip Infineon TC277, and finally realizes the closed-loop control of the vehicle permanent magnet synchronous motor through the output voltage of the insulated gate bipolar transistor (IGBT) in the 6-way inverter. Details can be referred to the prior art, and the present embodiment will not be described in detail.

[0070] In the present embodiment, the motor system efficiency improvement system includes a CAN communication transceiver module, a torque coordination module, a frequency control module, and a motor control module. The present embodiment first receives the instruction information sent by the vehicle controller through the CAN communication transceiver module, analyzes the instruction information, and transmits the analyzed instruction information to the torque coordination module. Then, the torque coordination module processes the analyzed instruction information to obtain target instruction information, and transmits the target instruction information to the motor control module and the frequency control module. The frequency control module processes the target instruction information to obtain frequency information and current loop control parameter information, and transmits the frequency information and current loop parameter information to the motor control module. The motor control module switches the motor control mode according to the target instruction information, and improves the motor efficiency according to the frequency information and the current loop control parameter information. The present embodiment processes the target instruction information through the frequency control module to obtain the current loop control parameter information, and then realizes the closed-loop control of the motor through the motor control module according to the current loop control parameter information, and improves the motor efficiency according to the frequency information.

[0071] Further, referring to Figure 2 , Figure 2 is a functional module diagram of the second embodiment of the motor system efficiency improvement system of the present application.

[0072] As Figure 2 shown, the frequency control module 30 includes a frequency state decision module 301, a frequency request module 302, and a parameter adaptive module 303.

[0073] The input end of the variable frequency state decision module 301 is connected with the output end of the torque coordination module 20, the output end of the variable frequency state decision module 301 is connected with the input end of the frequency request module 302 and the input end of the parameter adaptive module 303 respectively, the output end of the frequency request module 302 is connected with another input end of the parameter adaptive module 303 and the motor control module 40 respectively, and the output end of the parameter adaptive module 303 is connected with the motor control module 40.

[0074] In a specific implementation, the variable frequency state decision module 301 can be a variable frequency control component, which is composed of three runnable entities, that is, the variable frequency state decision module 301, the frequency request module 302 and the parameter adaptive module 303.

[0075] The variable frequency state decision module 301 is used for receiving target instruction information sent by the torque coordination module 20, and the target instruction information includes a motor speed signal and a torque signal.

[0076] The variable frequency state decision module 301 is further used for processing the motor speed signal and the torque signal to obtain a current frequency state signal, and transmitting the motor speed signal, the torque signal and the current frequency state signal to the frequency request module 302.

[0077] Further, referring to Figure 3 , Figure 3 It is a signal flow diagram of the motor control module.

[0078] As Figure 3 shown, FSD is the variable frequency state decision module 301, PFR is the frequency request module 302, and PAR is the parameter adaptive module 303. SWC VF is a variable frequency control component, Velocity is a motor 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.

[0079] In a specific implementation, the variable frequency state decision module (FSD) 301 can process the motor speed signal and the torque signal to obtain the current frequency state signal, and the processed motor speed signal and torque signal are the same as the motor speed signal and torque signal before processing.

[0080] Further, in order to determine the current frequency state signal, in the embodiment, the variable frequency state decision module 301 is further used for determining a current state according to the motor speed signal and the torque signal, and determining the current frequency state signal according to the current state.

[0081] It should be noted that the current state can include: a default state, a locked-rotor frequency reduction state, and a continuous frequency conversion state. The default state is a state that the system automatically enters after power-on, which is equivalent to entering the default state as long as the power is on. The locked-rotor frequency reduction state refers to a state in which torque is still output when the motor speed is 0. The continuous frequency conversion state refers to a state in which the current frequency continuously changes.

[0082] It can be understood that there is a corresponding current frequency state signal for each current state, so the current frequency state signal can be determined according to the current state.

[0083] Further, in order to accurately determine the current frequency state signal, in the embodiment, the frequency state decision module 301 is further configured to set the current frequency state signal as a first preset frequency state signal when entering the default state.

[0084] The frequency state decision module 301 is further configured to switch to the locked-rotor frequency reduction state and set the current frequency state signal as a second preset frequency state signal when the torque signal is in a first preset torque range, the motor speed signal is in a first preset speed range, and the first preset time length is continuous.

[0085] The frequency state decision module 301 is further configured to switch to the default state when the locked-rotor frequency reduction state is in the locked-rotor frequency reduction state, and the torque signal is in a second preset torque range, the motor speed signal is in a second preset speed range, and the second preset time length is continuous.

[0086] Further, in the embodiment, the frequency state decision module 301 is further configured to switch to the continuous frequency conversion state and set the current frequency state signal as the continuous frequency conversion when the default state is in the default state, and the motor speed signal is in a third preset speed range and the third preset time length is continuous.

[0087] The frequency state decision module 301 is further configured to switch to the default state when the continuous frequency conversion state is in the continuous frequency conversion state, and the motor speed signal is in a fourth preset speed range and the fourth preset time length is continuous.

[0088] It should be noted that the first preset frequency state signal, the first preset torque range, the first preset speed range, the first preset time length, the second preset frequency state signal, the second preset torque range, the second preset speed range, the second preset time length, the third preset speed range, the third preset time length, the fourth preset speed range, and the fourth preset time length are all calibratable, that is, they can change according to actual conditions, and the specific values are not limited in the embodiment.

[0089] Further, with reference to Figure 4, Figure 4 The current state change diagram of the variable frequency state decision module of the application.

[0090] As shown in the figure, PW0 represents the default state, PW1 represents the locked-rotor frequency reduction state, and PW2 represents the continuous variable frequency state. Figure 4

[0091] In a specific implementation, specific values in the table can be combined for illustration, and this embodiment does not represent that the application can only be limited to this case. As shown in the table, 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 torque signal is greater than 200 NM, the motor speed signal is less than 50 RPM, and the state lasts for a period of time, the locked-rotor frequency reduction state PW1 is entered, and the current frequency state signal is set to 2 kHz; after the torque signal is less than 50 NM, the motor speed signal is greater than 200 RPM, and the state lasts for a period of time, the default state PW0 is returned. Figure 4 Figure 4 As shown in the table, 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 torque signal is greater than 200 NM, the motor speed signal is less than 50 RPM, and the state lasts for a period of time, the locked-rotor frequency reduction state PW1 is entered, and the current frequency state signal is set to 2 kHz; after the torque signal is less than 50 NM, the motor speed signal is greater than 200 RPM, and the state lasts for a period of time, the default state PW0 is returned.

[0092] As shown in the table, 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 torque signal is greater than 200 NM, the motor speed signal is less than 50 RPM, and the state lasts for a period of time, the locked-rotor frequency reduction state PW1 is entered, and the current frequency state signal is set to 2 kHz; after the torque signal is less than 50 NM, the motor speed signal is greater than 200 RPM, and the state lasts for a period of time, the default state PW0 is returned.

[0093] 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 state signal, and transmit the frequency value to the parameter adaptive module 303 and the motor control module 40.

[0094] Further, in order to determine the frequency value, in the embodiment, the frequency request module 302 is further configured to determine the frequency value according to the current frequency state signal when the current frequency state signal satisfies a preset frequency condition.

[0095] 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.

[0096] Further, in order to accurately determine the frequency value, in the embodiment, the frequency request module 302 is further configured to set the frequency value to the second preset frequency state signal when the current frequency state signal is the second preset frequency state signal.

[0097] ​​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.

[0098] The frequency request module 302 is further configured to enter a continuous frequency conversion state and determine the frequency value by querying a preset continuous frequency conversion table according to the motor speed signal and the torque signal when the current frequency state signal is neither the second preset frequency state signal nor the first preset frequency state signal.

[0099] Further, refer to Figure 5 , Figure 5 for a schematic diagram of the change of the frequency value of the frequency request module.

[0100] As shown in Figure 5 , Freq represents the frequency value.

[0101] It can be understood that the specific values in Figure 5 may be combined for illustration, and this embodiment is not limited to this case. Figure 5 The change of the frequency value in Figure 4 may be illustrated based on the values in the above , first determine whether the current frequency state signal is 2 kHz, if yes, the frequency value is 2 kHz, if not, determine whether the current frequency state signal is 5 kHz, if yes, the frequency value is 5 kHz, if not, enter the continuous frequency conversion state.

[0102] In a specific implementation, the frequency value can be determined by querying Table 1 according to the motor speed signal and the torque signal, the horizontal axis in Table 1 represents the motor speed signal, and the vertical axis represents the torque signal, Table 1 only represents one case, and a specific preset continuous frequency conversion table needs to be matched and calibrated by a motor bench.

[0103] Table 1:

[0104]

[0105] The parameter adaptive module 303 is configured to generate parameter information according to the motor speed signal and the frequency value, and transmit the parameter information to the motor control module 40.

[0106] Further, refer to Figure 6 , Figure 6 for a parameter information processing diagram of the parameter adaptive module.

[0107] As shown in Figure 6 , the parameter adaptive module 303 can generate parameter information according to the motor speed signal and the frequency value, which can be determined by table lookup, and the specific values need to be matched and calibrated by a motor bench for different motor systems.

[0108] Further, referring to Figure 7 , Figure 7 is a function module diagram of the third embodiment of the motor system efficiency improving system.

[0109] As shown in Figure 7 , the motor system efficiency improving system further comprises a signal processing module 50 and a fault diagnosis module 60;

[0110] The signal processing module 50 is connected with the input end of the fault diagnosis module 60, the input end of the CAN communication transceiver module 10, another input end of the frequency conversion control module 30 and another input end of the motor control module 40 respectively, and the output end of the fault diagnosis module 60 is connected with another input end of the torque coordination module 20 and another input end of the motor control module 40 respectively;

[0111] The signal processing module 50 is configured to receive the electrical signal of the motor controller and transmit the electrical signal to the fault diagnosis module 60.

[0112] It can be understood that the signal processing module 50 can collect the analog and digital signals of the controller hardware and convert them into the physical quantity required by the system, i.e. the electrical signal.

[0113] 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.

[0114] The torque coordination module 20 is further configured to process the parsed 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.

[0115] It can be understood that the torque coordination module 20 processes the parsed torque information, combines the alarm and fault information output by the fault diagnosis module 60, and makes the final torque arbitration and coordination.

[0116] In a specific implementation, the torque coordination module 20 can limit the power or perform other processing on the parsed instruction information according to the fault information to obtain the target instruction information.

[0117] In the embodiment, the variable frequency control module comprises a variable frequency state decision module, a frequency request module and a parameter adaptive module, the embodiment first receives the target instruction information sent by the torque coordination module through the variable frequency state decision module, the target instruction information comprises a motor speed signal and a torque signal, processes the motor speed signal and the torque signal, obtains 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 generates a frequency value according to the motor speed signal, the torque signal and the current frequency state signal through the frequency request module, and transmits the frequency value to the parameter adaptive module, and then generates parameter information according to the motor speed signal and the frequency value through the parameter adaptive module, and transmits the parameter information to the motor control module. The control logic between the variable frequency state decision module, the frequency request module and the parameter adaptive module can accurately determine the parameter information, so as to realize the closed-loop control of the motor.

[0118] To achieve the above object, the application further provides a vehicle permanent magnet synchronous motor, which comprises the motor system efficiency improving system as described above. The specific structure of the motor system efficiency improving system is referred to the above embodiment. Since the vehicle permanent magnet synchronous motor adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0119] To achieve the above object, the application further provides a vehicle permanent magnet synchronous motor system efficiency improving device, which comprises an inverter and a vehicle permanent magnet synchronous motor as described above, the inverter is connected with the vehicle permanent magnet synchronous motor, and the motor control module is further used for controlling the switching frequency of the inverter to adjust the efficiency of the vehicle permanent magnet synchronous motor.

[0120] It can be understood that the inverter comprises an insulated gate bipolar transistor (IGBT), and the switching frequency of the IGBT can be controlled by the motor control module 40. The higher the switching frequency, the greater the loss, resulting in lower efficiency of the vehicle permanent magnet synchronous motor. Therefore, by reducing the switching frequency of the IGBT, the efficiency of the vehicle permanent magnet synchronous motor can be improved.

[0121] The above description is only the preferred embodiment of the application, and does not limit the patent scope of the application. Any equivalent structural transformation made according to the content of the specification and drawings, or direct / indirect application in other related technical fields within the inventive concept of the application is included in the patent protection scope of the application.

Claims

1. A motor system efficiency improvement system, characterized in that, The motor system efficiency improvement system includes: a CAN communication transceiver module, a torque coordination module, a frequency converter control module, and a motor control module; The output of the CAN communication transceiver module is connected to the input of the torque coordination module, the output of the torque coordination module is connected to the input of the frequency converter control module, and the outputs of the torque coordination module and the frequency converter control module are connected to the motor control module. The CAN communication transceiver module is used to receive instruction information sent by the vehicle controller, parse the instruction information, and transmit the parsed instruction information to the torque coordination module. The torque coordination module is used to process the parsed instruction information, obtain the target instruction information, and transmit the target instruction information to the motor control module and the frequency converter control module. The frequency conversion control module is used to process the target command information, obtain frequency information and current loop control parameter information, and transmit the current loop control parameter information to the motor control module; The motor control module is used to switch the motor control mode according to the target instruction information, and to improve the motor efficiency according to the frequency information and the current loop control parameter information. The frequency conversion control module includes: a frequency conversion status decision module, a frequency request module, and a parameter adaptive module; The input terminal of the variable frequency state decision module is connected to the output terminal of the torque coordination module. The output terminal of the variable frequency state decision module is connected to the input terminal of the frequency request module and the input terminal of the parameter adaptation module. The output terminal of the frequency request module is connected to the other input terminal of the parameter adaptation module and the motor control module. The output terminal of the parameter adaptation module is connected to the motor control module. The variable frequency state decision module is used to receive target instruction information sent by the torque coordination module, the target instruction information including motor speed signal and torque signal; The frequency conversion status decision module is further configured to process the motor speed signal and the torque signal to obtain the current frequency status signal, and transmit the motor speed signal, the torque signal and the current frequency status signal to the frequency request module; The frequency request module is used to generate a frequency value based on the motor speed signal, the torque signal and the current frequency status signal, and transmit the frequency value to the parameter adaptation module and the motor control module. The parameter adaptive module is used to generate parameter information based on the motor speed signal and the frequency value, and transmit the parameter information to the motor control module.

2. The motor system efficiency improvement system as described in claim 1, characterized in that, The variable frequency state decision module is further configured to determine the current state based on the motor speed signal and the torque signal, and to determine the current frequency state signal based on the current state.

3. The motor system efficiency improvement system as described in claim 2, characterized in that, The current state includes: the default state and the stalled frequency reduction state; The frequency conversion state decision module is also used to set the current frequency state signal as the first preset frequency state signal when entering the default state. The frequency conversion state decision module is also used to switch to a stalled frequency reduction state when the torque signal is in a first preset torque range, the motor speed signal is in a first preset speed range and lasts for a first preset duration, and set the current frequency state signal as a second preset frequency state signal. The variable frequency state decision module is also used to switch to the default state when the stalled frequency reduction state is in effect, if it detects that the torque signal is in the second preset torque range and the motor speed signal is in the second preset speed range for a second preset duration.

4. The motor system efficiency improvement system as described in claim 3, characterized in that, The current state also includes: continuous frequency conversion state; The frequency conversion state decision module is also used to switch to continuous frequency conversion state when the motor speed signal is detected to be in the third preset speed range and lasts for the third preset time when the default state is in the default state, and set the current frequency state signal to continuous frequency conversion. The frequency conversion state decision module is further configured to switch to the default state when the motor speed signal is detected to be within a fourth preset speed range and lasts for a fourth preset duration while in the continuous frequency conversion state.

5. The motor system efficiency improvement system as described in claim 4, characterized in that, 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 meets the preset frequency conditions; The frequency request module is further configured to determine the frequency value based on the motor speed signal and the torque signal when the current frequency status signal does not meet the preset frequency condition.

6. The motor system efficiency improvement system as described in claim 5, characterized in that, The frequency request module is further configured to set the frequency value to 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 to 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 status signal is not the second preset frequency status signal and the first preset frequency status signal, and determine the frequency value by querying a preset continuous frequency conversion table based on the motor speed signal and the torque signal.

7. The motor system efficiency improvement system as described in claim 1, characterized in that, The motor system efficiency improvement system also includes: a signal processing module and a fault diagnosis module; The signal processing module is connected to the input terminal of the fault diagnosis module, the input terminal of the CAN communication transceiver module, another input terminal of the frequency converter control module, and another input terminal of the motor control module, respectively. The output terminal of the fault diagnosis module is connected to another input terminal of the torque coordination module and another input terminal of the motor control module, respectively. The signal processing module is used to receive electrical signals from the motor controller and transmit the electrical signals to the fault diagnosis module; The fault diagnosis module is used to diagnose the electrical signals, obtain fault information, and transmit the fault information to the torque coordination module. The torque coordination module is further configured to process the parsed instruction information based on the fault information to obtain target instruction information, and transmit the target instruction information to the motor control module and the frequency converter control module.

8. A permanent magnet synchronous motor for vehicles, characterized in that, The vehicle permanent magnet synchronous motor includes the motor system efficiency improvement system as described in any one of claims 1 to 7.

9. A device for improving the efficiency of a motor system, characterized in that, The motor system efficiency improvement device includes an inverter and a vehicle permanent magnet synchronous motor as described in claim 8; The inverter is connected to the vehicle permanent magnet synchronous motor; The motor control module is also used to control the switching frequency of the inverter in order to adjust the efficiency of the vehicle permanent magnet synchronous motor.

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