Motor controller, power assembly, vehicle and method for reducing electromagnetic radiation

Abstract

The invention provides a motor controller for reducing electromagnetic radiation, a power assembly, a vehicle and an electromagnetic radiation reducing method of the motor controller, the motor controller comprises a power conversion module, and the motor controller is used for receiving direct current power supply and outputting alternating current voltage through the power conversion module to drive a motor to rotate. And when the current of the motor is greater than the preset current value, the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency to a preset switching frequency value. Wherein the preset current value is used for indicating that the electromagnetic radiation intensity of the motor exceeds the preset electromagnetic radiation intensity value. On the basis of the application, when the current of the motor is large, that is, the electromagnetic radiation intensity of the motor is high, the switching frequency of the power switching tube can be subjected to frequency reduction processing to reduce the electromagnetic radiation frequency output by the motor, so that the electromagnetic radiation intensity of the motor is reduced, and the potential safety hazard that a user suffers from electromagnetic radiation is reduced.

Description

Technical Field

[0001] The present application relates to the electric field, and in particular to a motor controller for reducing electromagnetic radiation, a powertrain, a vehicle, and a method for reducing electromagnetic radiation of the motor controller. Background Art

[0002] At present, there are many electronic components in vehicles, which mainly include auxiliary equipment such as air conditioners, wiper motors, fans, seats, display screens, and motors. Among them, the motor, as the power core of the vehicle, must not only realize the task of driving the vehicle, but also bear the function of generating electricity to the power battery when the vehicle brakes or coasts. In the process of the motor driving the vehicle, the motor will emit low-frequency electromagnetic radiation below 400kHz. If the user is in a driving environment with high electromagnetic radiation intensity for a long time, the safety hazard of the user being exposed to electromagnetic radiation will increase. Therefore, it is particularly important to reduce the electromagnetic radiation intensity of the motor. Summary of the invention

[0003] The present application provides a motor controller, a powertrain, a vehicle and a method for reducing electromagnetic radiation of a motor controller, which can reduce the electromagnetic radiation intensity of the motor, thereby reducing the safety hazard of users being exposed to electromagnetic radiation.

[0004] In the first aspect, an embodiment of the present application provides a motor controller for reducing electromagnetic radiation, the motor controller including a power conversion module, the motor controller being used to receive a DC power supply and output an AC voltage through the power conversion module to drive the motor to rotate. When the current of the motor is greater than a preset current value, the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency to a preset switching frequency value. Among them, the preset current value is used to indicate that the electromagnetic radiation intensity of the motor exceeds the preset electromagnetic radiation intensity value. In implementing the embodiment of the present application, when the current of the motor is large, that is, the electromagnetic radiation intensity of the motor is strong, the switching frequency of the power switch tube can be reduced to reduce the electromagnetic radiation frequency output by the motor, thereby reducing the electromagnetic radiation intensity of the motor, and further reducing the safety hazard of the user being exposed to electromagnetic radiation.

[0005] In one possible implementation, when the current of the motor is greater than a preset current value, the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency in a step-like or linear manner to a preset switching frequency value, thereby reducing the electromagnetic radiation intensity of the motor and further reducing the safety hazard of the user being exposed to electromagnetic radiation.

[0006] In a possible implementation, after the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency to the preset switching frequency value, the motor controller controls the power switch tube of the power conversion module to switch according to the frequency value of the first frequency interval. Among them, the frequency value of the first frequency interval is greater than or equal to nine-tenths of the preset switching frequency value and less than or equal to eleven-tenths of the preset switching frequency value. In implementing the embodiment of the present application, after the switching frequency of the power switch tube is reduced, the switching frequency of the power switch tube can also be controlled to fluctuate (i.e., frequency jitter) within the first frequency interval, thereby reducing the peak electromagnetic radiation intensity of the motor at the preset switching frequency value.

[0007] In a possible implementation, when the current of the motor at the first moment is greater than the current of the motor at the second moment, the switching frequency value reduced by the power switch tube at the first moment is greater than the switching frequency value reduced by the power switch tube at the second moment. By implementing the embodiment of the present application, the switching frequency value reduced by the power switch tube at different moments can be flexibly adjusted according to the current of the motor, so that it meets the frequency requirement of reducing the electromagnetic radiation intensity of the motor, and the control flexibility is stronger.

[0008] In a possible implementation, when the running speed of the motor at the first moment is greater than the running speed of the motor at the second moment, the upper limit of the switching frequency value reduced by the power switch tube at the first moment is less than the upper limit of the switching frequency value reduced by the power switch tube at the second moment. By implementing the embodiment of the present application, the upper limit of the switching frequency value reduced by the power switch tube at different moments can be flexibly adjusted according to the running speed of the motor, so that it meets the frequency requirement of reducing the electromagnetic radiation intensity of the motor, and the control flexibility is stronger.

[0009] In a possible implementation, the preset current value is positively correlated with the maximum working current of the motor. By implementing the embodiment of the present application, the preset current value can be flexibly adjusted according to the maximum working current of the motor, and the control flexibility is stronger.

[0010] In a possible implementation, the motor controller is also used to control the power switch tube of the power conversion module to switch according to the frequency value of the second frequency interval when the current of the motor is less than or equal to the preset current value. Wherein, the frequency value of the second frequency interval is greater than or equal to nine-tenths of the second switching frequency value and less than or equal to eleven-tenths of the second switching frequency value, and the second switching frequency value is less than the preset switching frequency value. When implementing the embodiment of the present application, when the current of the motor is small, that is, the electromagnetic radiation intensity of the motor is weak, the switching frequency of the power switch tube can be controlled to fluctuate (i.e., frequency jitter) within the second frequency interval, thereby reducing the peak electromagnetic radiation intensity of the motor at the second switching frequency value.

[0011] In a second aspect, an embodiment of the present application provides a powertrain, which includes a motor and a motor controller as provided in the first aspect and any one of its possible embodiments, wherein the rotary transformer of the motor is connected to the motor controller. The motor controller obtains the running speed of the motor through the signal of the rotary transformer, and during the operation of the motor, the motor controller can also reduce the electromagnetic radiation intensity of the motor, thereby reducing the electromagnetic radiation intensity of the powertrain.

[0012] In a third aspect, an embodiment of the present application provides a vehicle, which includes a motor controller, a display screen or a radiation control button as provided in any one of the above-mentioned first aspect and possible embodiments thereof. In response to touching the display screen or pressing the radiation control button, the longitudinal acceleration of the vehicle is greater than or equal to the preset longitudinal acceleration, and the vehicle instructs the motor controller to control the motor to reduce the torque output so that the longitudinal acceleration of the vehicle is less than the preset longitudinal acceleration. In response to touching the display screen or pressing the radiation control button, the vehicle instructs the motor controller to control the power switch tube of the power conversion module to reduce the switching frequency to the preset switching frequency value and then switch according to the frequency value of the first frequency interval when the current of the motor is greater than the preset current value, or the vehicle instructs the motor controller to control the power switch tube of the power conversion module to switch according to the frequency value of the second frequency interval when the current of the motor is less than or equal to the preset current value. By implementing the embodiment of the present application, the torque output of the motor can be limited when the longitudinal acceleration is large, thereby reducing the differential mode current output by the motor, and further reducing the electromagnetic radiation intensity of the motor. In addition, the switching frequency value of the power switch tube can be flexibly adjusted according to the current of the motor, further reducing the electromagnetic radiation intensity of the motor.

[0013] In a possible implementation, the vehicle includes a motor, a vehicle controller and an intelligent wiper, wherein the motor controller and the intelligent wiper are respectively connected to the vehicle controller in communication. In response to touching the display screen or pressing the radiation control button, when the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency to a preset switching frequency value and then switch according to the frequency value of the first frequency interval, or when the motor controller controls the power switch tube of the power conversion module to switch according to the frequency value of the second frequency interval, the vehicle instructs the vehicle controller to control the gear position of the intelligent wiper in automatic adjustment mode. In the automatic adjustment mode, the gear position of the intelligent wiper is the lowest wiper gear position adjusted according to the vehicle's driving speed and rainfall conditions. By implementing the embodiment of the present application, the gear position of the intelligent wiper can be intelligently adjusted to the automatic adjustment mode, so that the gear position of the intelligent wiper is always maintained at the lowest wiper gear position adjusted in the automatic adjustment mode, thereby reducing the electromagnetic radiation intensity of the intelligent wiper, thereby reducing the safety hazard of the user being exposed to electromagnetic radiation.

[0014] In a possible implementation, the vehicle further includes a seat, wherein the seat is communicatively connected to the vehicle controller. In response to touching the display screen or pressing the radiation control button, when the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency to a preset switching frequency value and then switch according to the frequency value of the first frequency interval, or when the motor controller controls the power switch tube of the power conversion module to switch according to the frequency value of the second frequency interval, the vehicle instructs the vehicle controller to prohibit the gear adjustment of the seat when the seat is carrying weight, thereby reducing the electromagnetic radiation intensity of the seat, thereby reducing the safety hazard of the user being exposed to electromagnetic radiation.

[0015] In a possible implementation, the vehicle includes an air conditioner, wherein the air conditioner is communicatively connected to the vehicle controller. In response to touching the display screen or pressing the radiation control button, when the motor controller controls the power switch tube of the power conversion module to switch according to the frequency value of the first frequency interval after reducing the switching frequency to the preset switching frequency value, or when the motor controller controls the power switch tube of the power conversion module to switch according to the frequency value of the second frequency interval, the vehicle instructs the vehicle controller to control the actual operating temperature of the air conditioner to be within the temperature interval when the command request temperature of the air conditioner is not within the temperature interval after the vehicle's cabin temperature is added or subtracted from the preset temperature. By implementing the embodiments of the present application, the temperature difference between the actual operating temperature of the air conditioner and the cabin temperature can be reduced, thereby reducing the electromagnetic radiation intensity of the air conditioner, and further reducing the safety hazard of the user being exposed to electromagnetic radiation.

[0016] In one possible implementation, the air conditioner includes an air outlet fan. In response to touching the display screen or pressing the radiation control button, when the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency to a preset switching frequency value and then switch according to the frequency value of the first frequency interval, or when the motor controller controls the power switch tube of the power conversion module to switch according to the frequency value of the second frequency interval, the vehicle instructs the vehicle controller to control the speed of the air outlet fan to be less than or equal to the preset fan speed value when the speed of the air outlet fan is greater than the preset fan speed value. In implementing the embodiment of the present application, when the speed of the air outlet fan is relatively large, the speed of the air outlet fan is reduced, which can reduce the electromagnetic radiation intensity of the fan, thereby reducing the safety hazard of the user being exposed to electromagnetic radiation.

[0017] In one possible implementation, the vehicle includes a voice reminder system. In response to touching the display screen or pressing the radiation control button, the longitudinal acceleration of the vehicle is greater than or equal to the frequency of the preset longitudinal acceleration within a preset time period and is greater than the preset frequency, and the vehicle instructs the vehicle controller to output a voice message to the inside of the vehicle through the voice reminder system. The voice message is used to instruct to reduce the speed of the vehicle. By implementing the embodiment of the present application, the speed of the vehicle can be reduced to reduce the electromagnetic radiation intensity of the motor, thereby reducing the safety hazard of the user being exposed to electromagnetic radiation.

[0018] In a fourth aspect, an embodiment of the present application provides a method for reducing electromagnetic radiation of a motor controller, which method is applicable to a power conversion module in a motor controller, wherein the motor controller is used to receive a DC power supply and output an AC voltage through the power conversion module to drive the motor to rotate. In this method, when the current of the motor is greater than a preset current value, the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency to a preset switching frequency value. Among them, the preset current value is used to indicate that the electromagnetic radiation intensity of the motor exceeds the preset electromagnetic radiation intensity value. In implementing the embodiment of the present application, when the current of the motor is large, that is, the electromagnetic radiation intensity of the motor is strong, the switching frequency of the power switch tube can be reduced to reduce the electromagnetic radiation frequency output by the motor, thereby reducing the electromagnetic radiation intensity of the motor, and further reducing the safety hazard of the user being exposed to electromagnetic radiation.

[0019] In one possible implementation, when the current of the motor is greater than a preset current value, the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency in a step-like or linear manner to a preset switching frequency value, thereby reducing the electromagnetic radiation intensity of the motor and further reducing the safety hazard of the user being exposed to electromagnetic radiation.

[0020] In a possible implementation, after the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency to the preset switching frequency value, the motor controller controls the power switch tube of the power conversion module to switch according to the frequency value of the first frequency interval. Among them, the frequency value of the first frequency interval is greater than or equal to nine-tenths of the preset switching frequency value and less than or equal to eleven-tenths of the preset switching frequency value. In implementing the embodiment of the present application, after the switching frequency of the power switch tube is reduced, the switching frequency of the power switch tube can also be controlled to fluctuate (i.e., frequency jitter) within the first frequency interval, thereby reducing the peak electromagnetic radiation intensity of the motor at the preset switching frequency value.

[0021] In a possible implementation, when the current of the motor at the first moment is greater than the current of the motor at the second moment, the switching frequency value reduced by the power switch tube at the first moment is greater than the switching frequency value reduced by the power switch tube at the second moment. By implementing the embodiment of the present application, the switching frequency value reduced by the power switch tube at different moments can be flexibly adjusted according to the current of the motor, so that it meets the frequency requirement of reducing the electromagnetic radiation intensity of the motor, and the control flexibility is stronger.

[0022] In a possible implementation, when the running speed of the motor at the first moment is greater than the running speed of the motor at the second moment, the upper limit of the switching frequency value reduced by the power switch tube at the first moment is less than the upper limit of the switching frequency value reduced by the power switch tube at the second moment. By implementing the embodiment of the present application, the upper limit of the switching frequency value reduced by the power switch tube at different moments can be flexibly adjusted according to the running speed of the motor, so that it meets the frequency requirement of reducing the electromagnetic radiation intensity of the motor, and the control flexibility is stronger.

[0023] In a possible implementation, the preset current value is positively correlated with the maximum working current of the motor. By implementing the embodiment of the present application, the preset current value can be flexibly adjusted according to the maximum working current of the motor, and the control flexibility is stronger.

[0024] In a possible implementation, the motor controller controls the power switch tube of the power conversion module to switch according to the frequency value of the second frequency interval when the current of the motor is less than or equal to the preset current value. The frequency value of the second frequency interval is greater than or equal to nine-tenths of the second switching frequency value and less than or equal to eleven-tenths of the second switching frequency value, and the second switching frequency value is less than the preset switching frequency value. When implementing the embodiment of the present application, when the current of the motor is small, that is, the electromagnetic radiation intensity of the motor is weak, the switching frequency of the power switch tube can be controlled to fluctuate (i.e., frequency jitter) within the second frequency interval, thereby reducing the peak electromagnetic radiation intensity of the motor at the second switching frequency value.

[0025] It should be understood that the implementation and beneficial effects of the above-mentioned aspects of the present application can be referenced to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application;

[0027] Figure 2 is a structural block diagram of a vehicle provided in an embodiment of the present application;

[0028] Figure 3 is another structural block diagram of a vehicle provided in an embodiment of the present application;

[0029] Figure 4 is another structural block diagram of a vehicle provided in an embodiment of the present application;

[0030] Figure 5 It is a schematic diagram of the workflow of the vehicle controller provided in an embodiment of the present application to perform an operation of reducing the intensity of electromagnetic radiation;

[0031] Figure 6 It is a flow chart of a method for reducing electromagnetic radiation of a motor controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] The implementation of the technical solution of the present application is further described in detail below in conjunction with the accompanying drawings.

[0034] See also Figure 1 , Figure 1 Schematic diagram of the structure of the vehicle provided in the embodiment of the present application. Figure 1 As shown, the vehicle 1 includes a powertrain 11, a power battery 12, a vehicle controller (VCU) 13 and an auxiliary device 14. Exemplarily, the auxiliary device 14 includes at least one of a seat, an air conditioner, an air outlet fan of the air conditioner and an intelligent wiper. Among them, the powertrain 11 includes a motor controller (MCU) 111 and a motor 112. The motor controller 111 is used to receive the DC power supply of the power battery 12 and output an AC voltage to the motor 112 to drive the motor 112 to rotate, so that the motor 112 runs and drives the vehicle 1 to travel. In addition, the rotary transformer (not shown in the figure) of the motor 112 is connected to the motor controller 111, and the motor controller 111 can also obtain the running speed of the motor 112 through the signal of the rotary transformer to control the speed of the motor 112 in real time during operation. During the operation of the motor 112, the motor 112 will emit low-frequency electromagnetic radiation outward. At this time, the motor controller 111 can also reduce the electromagnetic radiation intensity of the motor 112, thereby reducing the electromagnetic radiation intensity of the powertrain 11. The above-mentioned vehicle controller 13 is used to control the operation of the auxiliary equipment 14 to improve the maneuverability of the vehicle 1 and the comfort of the user. During the operation of the auxiliary equipment 14, the auxiliary equipment 14 will also emit low-frequency electromagnetic radiation outward. At this time, the vehicle controller 13 is also used to reduce the electromagnetic radiation intensity of the auxiliary equipment 14. By implementing the embodiment of the present application, the electromagnetic radiation intensity of the motor 112 and the electromagnetic radiation intensity of the auxiliary equipment 14 can be reduced, thereby greatly reducing the electromagnetic radiation intensity of the vehicle 1, providing users with a low electromagnetic radiation vehicle environment, and reducing the safety hazards of users being exposed to electromagnetic radiation.

[0035] See also Figure 2 , Figure 2 is a structural block diagram of a vehicle provided in an embodiment of the present application. Figure 2As shown, the vehicle 2 includes a motor controller 21, a motor 22, and a display screen 23 or a radiation control button 24. For example, the display screen 23 can be a central control screen or a display screen of other devices in the vehicle 2, which is not limited here. The functions of the motor controller 21 and the motor 22 can be referred to above. Figure 1 The relevant descriptions in the corresponding embodiments will not be repeated here.

[0036] In response to touching the display screen 23 or pressing the radiation control button 24, the vehicle 2 sends an enable signal to the motor controller 21 to instruct the motor controller 21 to perform an operation to reduce the intensity of electromagnetic radiation. The enable signal is a signal for controlling the vehicle 2 to be in a low electromagnetic radiation mode, and the low electromagnetic radiation mode is a working mode for controlling the electromagnetic radiation intensity of the vehicle 2 to be reduced. When the display screen 23 is not touched or the radiation control button 24 is not pressed, the motor controller 21 outputs a drive signal to the power switch tube of the power conversion module 211 based on the AC voltage required by the motor 22, so that the power conversion module 211 outputs an AC voltage to drive the motor 22 to rotate.

[0037] The following will be combined Figure 3 The operation of the motor controller 21 to reduce the intensity of electromagnetic radiation will be described in detail.

[0038] See also Figure 3 , Figure 3 is another structural block diagram of a vehicle provided in an embodiment of the present application. Figure 3 As shown above Figure 2 The motor controller 21 shown includes a power conversion module 211 , wherein the motor controller 21 is used to receive DC power supply and output AC voltage through the power conversion module 211 to drive the motor 22 to rotate.

[0039] In response to touching the display screen 23 or pressing the radiation control button 24, the longitudinal acceleration of the vehicle 2 is greater than or equal to the preset longitudinal acceleration, and the vehicle 2 instructs the motor controller 21 to control the motor 22 to reduce the torque output so that the longitudinal acceleration of the vehicle 2 is less than the preset longitudinal acceleration. Exemplarily, the preset longitudinal acceleration can be 0.2 times the acceleration of gravity. In a specific implementation, the motor controller 21 is used to determine the torque given value of the motor 22 and control the torque of the motor 22 to be reduced to the torque given value. Among them, the greater the difference between the longitudinal acceleration and the preset longitudinal acceleration, the greater the reduction of the torque of the motor 22, that is, the greater the difference between the torque before the reduction and the torque given value. Exemplarily, when the vehicle 2 is a four-wheel drive vehicle, the motor 22 includes a front drive motor and a rear drive motor, and the torque of the motor 22 includes the torque of the front drive motor and the torque of the rear drive motor. At this time, the motor controller 21 will determine the torque given value of the front drive motor and the torque given value of the rear drive motor respectively through the torque distribution strategy, and reduce the torque of the front drive motor and the torque of the rear drive motor to their corresponding torque given values ​​respectively. By implementing the embodiment of the present application, the torque output of the motor 22 can be limited when the longitudinal acceleration a is large, thereby reducing the differential mode current output by the motor 22 and further reducing the electromagnetic radiation intensity of the motor 22.

[0040] In response to touching the display screen 23 or pressing the radiation control button 24, the vehicle 2 instructs the motor controller 21 to collect the current of the motor 22. Optionally, the vehicle 2 instructs the motor controller 21 to collect the speed and torque of the motor 22 to obtain the current of the motor 22. In a specific implementation, the motor controller 21 is also used to find a target correspondence relationship from multiple sets of correspondence relationships between the speed and torque of the motor 22 and the current of the motor 22 based on the speed and torque of the motor 22, and use the current in the target correspondence relationship as the current of the motor 22. Exemplarily, the current of the motor 22 can be an effective value of the current.

[0041] When the current of the motor 22 is greater than the preset current value, the motor controller 21 controls the power switch tube of the power conversion module 211 to reduce the switching frequency to the preset switching frequency value. The preset current value is used to indicate that the electromagnetic radiation intensity of the motor 22 exceeds the preset electromagnetic radiation intensity value. That is, when the current I of the motor 22 is at [preset current value, maximum working current], the electromagnetic radiation intensity of the motor 22 is at [preset electromagnetic radiation intensity value, maximum electromagnetic radiation intensity]. The above preset current value is positively correlated with the maximum working current of the motor 22. For example, the preset current value can be 50% to 75% of the maximum working current of the motor 22. The above preset electromagnetic radiation intensity value is positively correlated with the maximum electromagnetic radiation intensity of the motor 22. For example, the preset electromagnetic radiation intensity value can be 50% to 75% of the maximum electromagnetic radiation intensity of the motor 22. In a specific implementation, when the current of the motor 22 is greater than the preset current value, the motor controller 21 can control the power switch tube of the power conversion module 211 to reduce the switching frequency in a step-like manner or linearly to the preset switching frequency value. The above is only an example, and the embodiment of the present application does not limit the specific method of reducing the switching frequency. When implementing the embodiment of the present application, when the current of the motor 22 is large, that is, the electromagnetic radiation intensity of the motor 22 is strong, the switching frequency of the power switch tube can be reduced to reduce the frequency of the electromagnetic radiation output by the motor 22, thereby reducing the electromagnetic radiation intensity of the motor 22, and further reducing the safety hazard of the user being exposed to electromagnetic radiation.

[0042] In the process of reducing the switching frequency of the power switch tube, when the current of the motor 22 at the first moment is greater than the current of the motor 22 at the second moment, the switching frequency value reduced by the power switch tube at the first moment is greater than the switching frequency value reduced by the power switch tube at the second moment. Among them, the first moment can be before the second moment, or it can be after the second moment. By implementing the embodiment of the present application, the switching frequency value reduced by the power switch tube at different moments can be flexibly adjusted according to the current of the motor 22, so that it meets the frequency requirement of reducing the electromagnetic radiation intensity of the motor 22, and the control flexibility is stronger.

[0043] In the process of reducing the switching frequency of the power switch tube, when the running speed of the motor 22 at the first moment is greater than the running speed of the motor 22 at the second moment, the upper limit of the switching frequency value reduced by the power switch tube at the first moment is less than the upper limit of the switching frequency value reduced by the power switch tube at the second moment. Among them, the first moment can be before the second moment or after the second moment. By implementing the embodiment of the present application, the upper limit of the switching frequency value reduced by the power switch tube at different moments can be flexibly adjusted according to the running speed of the motor 22, so that it meets the frequency requirement of reducing the electromagnetic radiation intensity of the motor 22, and the control flexibility is stronger.

[0044] After the motor controller 21 controls the power switch tube of the power conversion module 211 to reduce the switching frequency to the preset switching frequency value, the motor controller 21 can also control the power switch tube of the power conversion module 211 to switch according to the frequency value of the first frequency interval. That is to say, the switching frequency of the power switch tube will fluctuate (i.e., frequency jitter) within the first frequency interval, and the average value of all switching frequencies in this frequency jittering process is the preset switching frequency value, and the proportion of all switching frequencies greater than the preset switching frequency value is the same as the proportion of less than the preset switching frequency value. Exemplarily, the frequency jittering strategy adopted by the motor controller 21 can be a Markov chain random method or a fixed frequency interval modulation method, which is only an example and is not limited here. Among them, the frequency value of the first frequency interval is greater than or equal to nine-tenths of the preset switching frequency value and less than or equal to eleven-tenths of the preset switching frequency value. In implementing the embodiment of the present application, after the switching frequency of the power switch tube is reduced, the switching frequency of the power switch tube can also be controlled to fluctuate within the first frequency interval, thereby reducing the peak value of the electromagnetic radiation intensity of the motor 22 at the preset switching frequency value.

[0045] After obtaining the current of the motor 22, the motor controller 21 is also used to control the power switch tube of the power conversion module 211 to switch according to the frequency value of the second frequency range when the current of the motor 22 is less than or equal to the preset current value, that is, the electromagnetic radiation intensity of the motor 22 is less than or equal to the preset electromagnetic radiation intensity value. That is to say, the switching frequency of the power switch tube will fluctuate (i.e., frequency jitter) within the second frequency range, and the average value of all switching frequencies in this frequency jittering process is the second switching frequency value, and the proportion of all switching frequencies greater than the second switching frequency value is the same as the proportion less than the second switching frequency value. Among them, the frequency value of the second frequency range is greater than or equal to nine-tenths of the second switching frequency value and less than or equal to eleven-tenths of the second switching frequency value, and the second switching frequency value is less than the preset switching frequency value. The second switching frequency value is determined by the internal components of the motor controller 21. Exemplarily, the second switching frequency value can be 10KHz. When implementing the embodiment of the present application, when the current of the motor 22 is small, that is, the electromagnetic radiation intensity of the motor 22 is weak, the switching frequency of the power switch tube can be controlled to fluctuate (that is, frequency jitter) within the second frequency range, thereby reducing the peak value of the electromagnetic radiation intensity of the motor 22 at the second switching frequency value.

[0046] In the case where the regulated switching frequency is obtained after the frequency reduction processing and the frequency jittering processing, or the regulated switching frequency is obtained only after the frequency jittering processing, the motor controller 21 is also used to generate a drive signal based on the regulated switching frequency and the AC voltage required by the motor 22 through a five-segment SVPWM method, and output a drive signal to the power switch tube of the power conversion module 211, so that the power conversion module 211 outputs an AC voltage to drive the motor 22 to rotate. In the implementation of the embodiment of the present application, the common mode voltage output by the power conversion module 211 can be reduced by generating waves through a five-segment SVPWM method, thereby further reducing the electromagnetic radiation intensity of the motor 22.

[0047] In the motor controller 21 provided in the present application, the electromagnetic radiation intensity of the motor 22 in daily driving scenarios and vehicle static scenarios can be greatly reduced, thereby providing users with a low electromagnetic radiation vehicle environment and reducing the safety risks of users being exposed to electromagnetic radiation.

[0048] See also Figure 4 , Figure 4 is another structural block diagram of a vehicle provided in an embodiment of the present application. Figure 4 As shown above Figure 3 The vehicle 2 shown also includes a vehicle controller 25, a smart wiper 26, a seat 27, an air conditioner 28, and a voice reminder system 29. The motor controller 21 and the smart wiper 26 are respectively connected to the vehicle controller 25 for communication, and the seat 27 and the air conditioner 28 are respectively connected to the vehicle controller 25 for communication.

[0049] In response to touching the display screen 23 or pressing the radiation control button 24, the vehicle 2 also sends an enable signal to the vehicle controller 25 to instruct the vehicle controller 25 to perform an operation to reduce the intensity of electromagnetic radiation. When the display screen 23 is not touched or the radiation control button 24 is not pressed, the vehicle controller 22 will not perform an operation to reduce the intensity of electromagnetic radiation, that is, the gear position of the smart wiper 26, the gear position of the seat 27, the actual working temperature of the air conditioner 28, and the speed of the outlet fan 281 of the air conditioner 28 remain unchanged.

[0050] The following will be combined Figure 5 The operation of the vehicle controller 22 to reduce the intensity of electromagnetic radiation is described in detail.

[0051] Step S101 , in response to touching the display screen 23 or pressing the radiation control button 24 .

[0052] In step S102, when the motor controller 21 controls the power switch tube of the power conversion module 211 to reduce the switching frequency to a preset switching frequency value and then switch according to the frequency value of the first frequency range, or when the motor controller 21 controls the power switch tube of the power conversion module 211 to switch according to the frequency value of the second frequency range, the vehicle 2 instructs the vehicle controller 25 to control the gear position of the intelligent wiper 26 to be in automatic adjustment mode.

[0053] In a specific implementation, the vehicle 2 instructs the vehicle controller 25 to control the gear position of the smart wiper 26 to switch from the manual adjustment mode to the automatic adjustment mode when the gear position of the smart wiper 26 is in the manual adjustment mode. In the manual adjustment mode, the gear position of the smart wiper 26 can be manually adjusted by the user, while in the automatic adjustment mode, the gear position of the smart wiper 26 is the lowest wiper gear position adjusted according to the driving speed and rainfall of the vehicle 2. The vehicle 2 instructs the vehicle controller 22 to control the gear position of the smart wiper 26 to remain unchanged when the gear position of the smart wiper 26 is in the automatic adjustment mode. By implementing the embodiment of the present application, the gear position of the smart wiper 26 can be intelligently adjusted to the automatic adjustment mode, so that the gear position of the smart wiper 26 is always maintained at the lowest wiper gear position adjusted in the automatic adjustment mode, thereby reducing the electromagnetic radiation intensity of the smart wiper 26, and further reducing the safety hazard of the user being exposed to electromagnetic radiation.

[0054] In step S103, when the motor controller 21 controls the power switch tube of the power conversion module 211 to reduce the switching frequency to a preset switching frequency value and then switch according to the frequency value of the first frequency range, or when the motor controller 21 controls the power switch tube of the power conversion module 211 to switch according to the frequency value of the second frequency range, the vehicle 2 instructs the vehicle controller 25 to prohibit the gear adjustment of the seat 27 when the seat 27 carries weight.

[0055] Optionally, the vehicle 2 may also instruct the vehicle controller 25 to lower the gear of the seat 27 to a preset gear when the seat 27 carries weight. When the gear of the seat 27 is higher, the speed of adjusting the seat position is faster, and when the gear of the seat 27 is lower, the speed of adjusting the seat position is slower. Exemplarily, the preset gear is the lowest gear of the seat 27, or other gears in the gear of the seat 27 that can meet the requirement of reducing the electromagnetic radiation intensity of the seat 27, which is not limited here. In implementing the embodiment of the present application, the gear of the seat 27 can be lowered to reduce the speed of adjusting the seat position, thereby reducing the electromagnetic radiation intensity of the seat 27, and further reducing the safety hazard of the user being exposed to electromagnetic radiation.

[0056] The vehicle 2 can also instruct the vehicle controller 25 to control the position of the seat 27 to be in an adjustable state when the seat 27 is not loaded with weight. At this time, the adjustment gear of the seat can be determined by the actual application scenario and is not limited here. In the adjustable state, the vehicle controller 22 can adjust the seat position up, down, left, and right.

[0057] In step S104, when the motor controller 21 controls the power switch tube of the power conversion module 211 to reduce the switching frequency to the preset switching frequency value and then switch according to the frequency value of the first frequency range, or when the motor controller 21 controls the power switch tube of the power conversion module 211 to switch according to the frequency value of the second frequency range, the vehicle 2 instructs the vehicle controller 25 to control the actual operating temperature of the air conditioner 28 to be within the temperature range when the command request temperature of the air conditioner 28 is not within the temperature range after the cabin temperature of the vehicle 2 is added or subtracted from the preset temperature.

[0058] The cabin temperature of the vehicle 2 may be obtained by an external temperature sensor sent to the vehicle controller 22, or directly collected by a temperature sensor inside the vehicle controller 22. For example, the preset temperature may be 2 degrees Celsius.

[0059] By implementing the embodiments of the present application, the temperature difference between the actual operating temperature of the air conditioner 28 and the cabin temperature can be reduced, thereby reducing the electromagnetic radiation intensity of the air conditioner 28, and further reducing the safety hazard of users being exposed to electromagnetic radiation.

[0060] The vehicle 2 may also instruct the vehicle controller 25 to control the actual operating temperature of the air conditioner 28 to be the same as the command request temperature when the command request temperature of the air conditioner 28 is within the temperature range.

[0061] In step S105, when the motor controller 21 controls the power switch tube of the power conversion module 211 to reduce the switching frequency to the preset switching frequency value and then switch according to the frequency value of the first frequency range, or when the motor controller 21 controls the power switch tube of the power conversion module 211 to switch according to the frequency value of the second frequency range, the vehicle 2 instructs the vehicle controller 25 to control the speed of the air outlet fan 281 to be less than or equal to the preset fan speed value when the speed of the air outlet fan 281 is greater than the preset fan speed value.

[0062] The preset fan speed value is a value set in advance. For example, the preset fan speed value is 30% of the maximum fan speed value.

[0063] By implementing the embodiment of the present application, when the rotation speed of the outlet fan 281 is relatively high, the rotation speed of the outlet fan 281 is reduced, so that the electromagnetic radiation intensity of the fan 281 can be reduced, thereby reducing the safety hazard of the user being exposed to electromagnetic radiation.

[0064] The vehicle 2 may also instruct the vehicle controller 25 to control the speed of the air outlet fan 281 to remain unchanged when the speed of the air outlet fan 281 is less than or equal to a preset fan speed value.

[0065] Step S106 , the longitudinal acceleration of the vehicle 2 is greater than or equal to the preset longitudinal acceleration within the preset time period and the frequency is greater than the preset frequency, and the vehicle 2 instructs the vehicle controller 25 to output voice information to the inside of the vehicle 2 through the voice reminder system 29 .

[0066] The voice information is used to instruct the user to reduce the speed of the vehicle 2. Optionally, the voice information is used to instruct the user to sit in the seat with the smallest electromagnetic radiation intensity in the vehicle 2. The seat with the smallest electromagnetic radiation intensity may be determined by the electrical architecture layout of the vehicle 2. For example, the seat with the smallest electromagnetic radiation intensity may be a seat on the left or right.

[0067] By implementing the embodiment of the present application, the driving speed of the vehicle 2 can be reduced to reduce the electromagnetic radiation intensity of the motor 22, thereby reducing the safety hazard of the user being exposed to electromagnetic radiation.

[0068] In the vehicle controller 25 provided in the present application, in daily driving scenarios and vehicle static scenarios, the electromagnetic radiation intensity of auxiliary equipment such as smart wipers 26, seats 27, air conditioners 28, and air outlet fans 281 can be reduced, thereby providing users with a low electromagnetic radiation vehicle environment and reducing the safety risks of users being exposed to electromagnetic radiation.

[0069] See also Figure 6 , Figure 6 1 is a flow chart of a method for reducing electromagnetic radiation of a motor controller provided in an embodiment of the present application. The method is applicable to a power conversion module in a motor controller, wherein the motor controller is used to receive a DC power supply and output an AC voltage through the power conversion module to drive the motor to rotate. Figure 6 As shown, the electromagnetic radiation reduction method specifically includes the following steps S201 to S204.

[0070] Step S201: the current of the motor is greater than a preset current value.

[0071] The preset current value is used to indicate that the electromagnetic radiation intensity of the motor exceeds the preset electromagnetic radiation intensity value, and the preset current value is positively correlated with the maximum working current of the motor.

[0072] If step S201 is satisfied, the motor controller executes step S202 and step S203. If step S201 is not satisfied, that is, the current of the motor is less than or equal to the preset current value, the motor controller executes step S204.

[0073] Step S202: the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency to a preset switching frequency value.

[0074] In a specific implementation, the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency in a step-like or linear manner to a preset switching frequency value, thereby reducing the electromagnetic radiation intensity of the motor and further reducing the safety hazard of users being exposed to electromagnetic radiation.

[0075] When the current of the motor at the first moment is greater than the current of the motor at the second moment, the switching frequency value reduced by the power switch tube at the first moment is greater than the switching frequency value reduced by the power switch tube at the second moment. By implementing the embodiment of the present application, the switching frequency value reduced by the power switch tube at different moments can be flexibly adjusted according to the current of the motor, so that it meets the frequency requirement of reducing the electromagnetic radiation intensity of the motor, and the control flexibility is stronger.

[0076] When the running speed of the motor at the first moment is greater than the running speed of the motor at the second moment, the upper limit of the switching frequency value reduced by the power switch tube at the first moment is less than the upper limit of the switching frequency value reduced by the power switch tube at the second moment. By implementing the embodiment of the present application, the upper limit of the switching frequency value reduced by the power switch tube at different moments can be flexibly adjusted according to the running speed of the motor, so that it meets the frequency requirement of reducing the electromagnetic radiation intensity of the motor, and the control flexibility is stronger.

[0077] When implementing the embodiments of the present application, when the current of the motor is large, that is, the electromagnetic radiation intensity of the motor is strong, the switching frequency of the power switch tube can be reduced to reduce the frequency of the electromagnetic radiation output by the motor, thereby reducing the electromagnetic radiation intensity of the motor and further reducing the safety hazard of users being exposed to electromagnetic radiation.

[0078] Step S203, after the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency to a preset switching frequency value, the motor controller controls the power switch tube of the power conversion module to switch according to the frequency value of the first frequency range.

[0079] Among them, the frequency value of the first frequency interval is greater than or equal to nine-tenths of the preset switching frequency value and less than or equal to eleven-tenths of the preset switching frequency value. In the implementation of the embodiment of the present application, after the switching frequency of the power switch tube is reduced, the switching frequency of the power switch tube can also be controlled to fluctuate (i.e., jitter) within the first frequency interval, thereby reducing the peak value of the electromagnetic radiation intensity of the motor at the preset switching frequency value.

[0080] Step S204: the motor controller controls the power switch tube of the power conversion module to switch according to the frequency value of the second frequency range.

[0081] Among them, the frequency value of the second frequency interval is greater than or equal to nine-tenths of the second switching frequency value and less than or equal to eleven-tenths of the second switching frequency value, and the second switching frequency value is less than the preset switching frequency value. When the embodiment of the present application is implemented, when the current of the motor is small, that is, the electromagnetic radiation intensity of the motor is weak, the switching frequency of the power switch tube can be controlled to fluctuate (i.e., jitter) within the second frequency interval, thereby reducing the peak electromagnetic radiation intensity of the motor at the second switching frequency value.

[0082] It can be understood that the specific operations of the motor controller executing steps S201 to S204 and their corresponding beneficial effects can all be referred to the specific operations of the motor controller 21 for reducing the intensity of electromagnetic radiation and their corresponding beneficial effects, which will not be repeated here.

[0083] In the electromagnetic radiation reduction method of the motor controller provided in the present application, the electromagnetic radiation intensity of the motor in daily driving scenarios and static vehicle scenarios can be greatly reduced, thereby providing users with a low electromagnetic radiation vehicle environment and reducing the safety risks of users being exposed to electromagnetic radiation.

[0084] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A motor controller for reducing electromagnetic radiation, characterized in that: The motor controller includes a power conversion module, and the motor controller is used to receive DC power supply and output AC voltage through the power conversion module to drive the motor to rotate, wherein: The current of the motor is greater than a preset current value, and the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency to a preset switching frequency value. The preset current value is used to indicate that the electromagnetic radiation intensity of the motor exceeds a preset electromagnetic radiation intensity value.

2. The motor controller according to claim 1, characterized in that: The current of the motor is greater than the preset current value, and the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency in a step-like manner or linearly to the preset switching frequency value.

3. The motor controller according to claim 1 or 2, characterized in that: After the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency to the preset switching frequency value, the motor controller controls the power switch tube of the power conversion module to switch according to the frequency value of the first frequency range, and the frequency value of the first frequency range is greater than or equal to nine-tenths of the preset switching frequency value and less than or equal to eleven-tenths of the preset switching frequency value.

4. The motor controller according to any one of claims 1 to 3, characterized in that: When the current of the motor at the first moment is greater than the current of the motor at the second moment, the switching frequency value reduced by the power switch tube at the first moment is greater than the switching frequency value reduced by the power switch tube at the second moment.

5. The motor controller according to any one of claims 1 to 4, characterized in that: When the running speed of the motor at the first moment is greater than the running speed of the motor at the second moment, the upper limit of the switching frequency value reduced by the power switch tube at the first moment is less than the upper limit of the switching frequency value reduced by the power switch tube at the second moment.

6. The motor controller according to any one of claims 1 to 5, characterized in that: The preset current value is positively correlated with the maximum operating current of the motor.

7. The motor controller according to claim 1, characterized in that: The motor controller is also used to control the power switch tube of the power conversion module to switch according to the frequency value of the second frequency range when the current of the motor is less than or equal to the preset current value, the frequency value of the second frequency range is greater than or equal to nine-tenths of the second switching frequency value and less than or equal to eleven-tenths of the second switching frequency value, and the second switching frequency value is less than the preset switching frequency value.

8. A powertrain, characterized in that: The power assembly includes the motor and the motor controller according to any one of claims 1 to 7, the rotary transformer of the motor is connected to the motor controller, and the motor controller obtains the running speed of the motor through the signal of the rotary transformer.

9. A vehicle, characterized in that: The vehicle comprises a motor controller, a display screen or a radiation control button according to any one of claims 1 to 7, wherein: In response to touching the display screen or pressing the radiation control button, the longitudinal acceleration of the vehicle is greater than or equal to a preset longitudinal acceleration, the vehicle instructs the motor controller to control the motor to reduce torque output so that the longitudinal acceleration of the vehicle is less than the preset longitudinal acceleration, the vehicle instructs the motor controller to control the power switch tube of the power conversion module to reduce the switching frequency to the preset switching frequency value and then switch according to the frequency value in the first frequency range when the current of the motor is greater than the preset current value, or the vehicle instructs the motor controller to control the power switch tube of the power conversion module to switch according to the frequency value in the second frequency range when the current of the motor is less than or equal to the preset current value.

10. The vehicle according to claim 9, characterized in that The vehicle comprises the motor, a vehicle controller and an intelligent wiper, wherein the motor controller and the intelligent wiper are respectively connected to the vehicle controller for communication, wherein: In response to touching the display screen or pressing the radiation control button, when the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency to the preset switching frequency value and then switch according to the frequency value of the first frequency range, or when the motor controller controls the power switch tube of the power conversion module to switch according to the frequency value of the second frequency range, the vehicle instructs the vehicle controller to control the gear position of the smart wiper to be in automatic adjustment mode.

11. The vehicle according to claim 9 or 10, characterized in that The vehicle further comprises a seat, which is communicatively connected to the vehicle controller, wherein: In response to touching the display screen or pressing the radiation control button, when the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency to the preset switching frequency value and then switch according to the frequency value of the first frequency range, or when the motor controller controls the power switch tube of the power conversion module to switch according to the frequency value of the second frequency range, the vehicle instructs the vehicle controller to prohibit the gear adjustment of the seat when the seat bears weight.

12. The vehicle according to any one of claims 9 to 11, characterized in that: The vehicle includes an air conditioner, which is communicatively connected to a vehicle controller, wherein: In response to touching the display screen or pressing the radiation control button, when the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency to the preset switching frequency value and then switch according to the frequency value of the first frequency range, or when the motor controller controls the power switch tube of the power conversion module to switch according to the frequency value of the second frequency range, the vehicle instructs the vehicle controller to control the actual operating temperature of the air conditioner to be within the temperature range when the command request temperature of the air conditioner is not within the temperature range of the vehicle's cabin temperature plus or minus the preset temperature.

13. The vehicle according to claim 12, characterized in that The air conditioner comprises an air outlet fan, wherein: In response to touching the display screen or pressing the radiation control button, when the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency to the preset switching frequency value and then switch according to the frequency value of the first frequency range, or when the motor controller controls the power switch tube of the power conversion module to switch according to the frequency value of the second frequency range, the vehicle instructs the vehicle controller to control the speed of the air outlet fan to be less than or equal to the preset fan speed value when the speed of the air outlet fan is greater than the preset fan speed value.

14. The vehicle according to any one of claims 9 to 13, characterized in that: The vehicle includes a voice reminder system, wherein: In response to touching the display screen or pressing the radiation control button, the longitudinal acceleration of the vehicle is greater than or equal to the preset longitudinal acceleration within a preset time period and the frequency is greater than the preset frequency, and the vehicle instructs the vehicle controller to output voice information to the interior of the vehicle through the voice reminder system, and the voice information is used to instruct to reduce the vehicle's driving speed.

15. A method for reducing electromagnetic radiation of a motor controller, characterized in that: The method is applicable to a power conversion module in the motor controller, and the motor controller is used to receive DC power supply and output AC voltage through the power conversion module to drive the motor to rotate. The method includes: when the current of the motor is greater than a preset current value, the motor controller controls the power switch tube of the power conversion module to reduce the switching frequency to a preset switching frequency value, and the preset current value is used to indicate that the electromagnetic radiation intensity of the motor exceeds a preset electromagnetic radiation intensity value.

Images