Control method of motor and resonant heating, vehicle-mounted compressor and vehicle

Abstract

This application discloses a control method for a motor and resonant heating, an on-board compressor, and a vehicle, relating to the fields of motor control and resonant heating technology. It is applied to a compressor controller connected to a motor, which includes a three-phase inverter circuit and a resonant heating circuit. The resonant heating circuit is connected between the midpoints of two bridge arms in the three-phase inverter circuit. The method involves acquiring control parameter information from the compressor controller, including the voltage vector value of the three-phase inverter circuit, the circuit control parameters of the resonant heating circuit, and a preset desired power value. A carrier frequency value is determined based on the desired power value, voltage vector value, and circuit control parameters. The motor and resonant heating circuit are then controlled according to the carrier frequency value. This application reduces the implementation cost of motor control and heating functions.

Description

Technical Field

[0001] This application relates to the field of motor control and resonant heating technology, and in particular to a control method for a motor and resonant heating, an on-board compressor, and a vehicle. Background Technology

[0002] As motor control and heating technology are increasingly used in various fields, users are also placing higher demands on the implementation of motor control and heating functions.

[0003] Traditional motor control and heating functions are implemented through a PTC (Positive Temperature Coefficient) heater. The heating is regulated by changing the number of switches or adjusting the duty cycle of the switches based on the onboard PTC heater controller. This requires separate inverter circuits and motor controllers for motor control. This method has significant drawbacks, as it necessitates separate controllers and control circuits for each function (including the PTC heater, onboard PTC heater controller, motor controller, and inverter circuit). This results in high implementation costs for the motor control and heating functions.

[0004] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of this application is to provide a control method for motor and resonant heating, an on-board compressor and a vehicle, in order to solve the technical problem of high implementation cost of motor control and heating functions.

[0006] To achieve the above objectives, this application provides a control method for a motor and resonant heating. This control method is applied to a compressor controller connected to a motor. The compressor controller includes a three-phase inverter circuit and a resonant heating circuit. The resonant heating circuit is connected between the midpoints of two bridge arms in the three-phase inverter circuit. The control method for the motor and resonant heating includes:

[0007] Obtain the control parameter information of the compressor controller, wherein the control parameter information includes the voltage vector value of the three-phase inverter circuit, the circuit control parameters of the resonant heating circuit, and the preset expected power value;

[0008] The carrier frequency value is determined based on the desired power value, the voltage vector value, and the circuit control parameters;

[0009] The motor and the resonant heating circuit are controlled according to the carrier frequency value.

[0010] In one embodiment, the step of determining the carrier frequency value based on the desired power value, the voltage vector value, and the circuit control parameters includes:

[0011] Determine the line voltage value corresponding to the voltage vector value, and use the quotient of the square of the line voltage value and the desired power value as the impedance value;

[0012] The carrier frequency value is determined based on the impedance value and the circuit control parameters within a preset impedance rule.

[0013] In one embodiment, before the step of obtaining the control parameter information of the compressor controller, the following steps are included:

[0014] Upon receiving a heating command and a motor control command, the step of obtaining the control parameter information of the compressor controller is executed.

[0015] When a heating command is received but no motor control command is received, the motor is controlled based on a preset high-frequency voltage vector, and the step of obtaining the control parameter information of the compressor controller is executed.

[0016] In one embodiment, the step of controlling the motor and the resonant heating circuit according to the carrier frequency value includes:

[0017] The resonant heating circuit is controlled based on the carrier frequency value;

[0018] Determine the waveform duty cycle corresponding to the carrier frequency value, and control the motor based on the waveform duty cycle.

[0019] In one embodiment, the control method for the motor and resonant heating further includes:

[0020] When no heating command is received, a preset carrier threshold is used as the carrier frequency value, and the step of controlling the motor and the resonant heating circuit according to the carrier frequency value is executed.

[0021] In addition, to achieve the above objectives, a vehicle-mounted compressor is also provided, the vehicle-mounted compressor including a compressor controller, a motor and a compression unit, the compressor controller being connected to the motor and the motor being connected to the compression unit;

[0022] The compressor controller includes a three-phase inverter circuit, a resonant heating circuit, and a controller. The resonant heating circuit is connected between the midpoints of the two bridge arms of the three-phase inverter circuit. The controller is connected to both the three-phase inverter circuit and the resonant heating circuit. The output terminal of the three-phase inverter circuit is connected to the motor. The compressor controller executes the motor and resonant heating control method described above.

[0023] In one embodiment, the midpoint of the bridge arm includes the midpoint of the first bridge arm and the midpoint of the second bridge arm connected by the resonant heating circuit, and the resonant heating circuit includes:

[0024] Equivalent resistance, wherein the first end of the equivalent resistance is connected to the midpoint of the first bridge arm;

[0025] A resonant inductor, wherein the first end of the resonant inductor is connected to the second end of the equivalent resistance;

[0026] A resonant capacitor, wherein the first end of the resonant capacitor is connected to the second end of the resonant inductor, and the second end of the resonant capacitor is connected to the midpoint of the second bridge arm.

[0027] In one embodiment, the three-phase inverter circuit includes a first inverter bridge arm, a second inverter bridge arm, and a third inverter bridge arm, and two of the bridge arm midpoints of the first inverter bridge arm, the second inverter bridge arm, and the third inverter bridge arm are connected to the resonant heating circuit.

[0028] In one embodiment, the motor includes a first phase input terminal, a second phase input terminal, and a third phase input terminal, and the three-phase inverter circuit further includes:

[0029] Motor controller;

[0030] The first end of the first inverter bridge arm is connected to the positive terminal of the external power supply, the second end of the first inverter bridge arm is connected to the negative terminal of the external power supply, and the midpoint of the first inverter bridge arm is connected to the first phase input terminal.

[0031] The first end of the second inverter bridge arm is connected to the positive terminal of the external power supply, the second end of the second inverter bridge arm is connected to the negative terminal of the external power supply, and the midpoint of the second inverter bridge arm is connected to the second phase input terminal.

[0032] The third end of the third inverter bridge arm is connected to the positive terminal of the external power supply, the second end of the third inverter bridge arm is connected to the negative terminal of the external power supply, and the midpoint of the third inverter bridge arm is connected to the third phase input terminal. The first inverter bridge arm, the second inverter bridge arm, and the third inverter bridge arm are composed of two series-connected switching transistors, and the control terminal of the switching transistors is connected to the motor controller.

[0033] In one embodiment, the compressor controller is further provided with a sampling circuit, which includes a first sampling circuit connected to the first inverter bridge arm, a second sampling circuit connected to the second inverter bridge arm, and a third sampling circuit connected to the third inverter bridge arm. The first sampling circuit, the second sampling circuit, and the third sampling circuit are composed of sampling resistors and sampling operational amplifiers.

[0034] In addition, to achieve the above objectives, a vehicle is also provided, the vehicle including the aforementioned on-board compressor.

[0035] This application provides a control method for a motor and resonant heating, applied to a compressor controller connected to a motor. The compressor controller includes a three-phase inverter circuit and a resonant heating circuit. The resonant heating circuit is connected between the midpoints of two bridge arms in the three-phase inverter circuit. The method involves acquiring control parameter information from the compressor controller, including the voltage vector value of the three-phase inverter circuit, the circuit control parameters of the resonant heating circuit, and a preset desired power value. A carrier frequency value is determined based on the desired power value, voltage vector value, and circuit control parameters. The motor and resonant heating circuit are then controlled according to the carrier frequency value. This control method for a motor and resonant heating is applied to a compressor controller where the resonant heating circuit is connected between the midpoints of two bridge arms in a three-phase inverter circuit, and the carrier frequency value is determined using the desired power value, voltage vector value, and circuit control parameters. This invention controls the motor and resonant heating circuit based on the carrier frequency value, thus avoiding the need for separate controllers and control circuits (including PTC heater, vehicle PTC heater controller, motor controller, and inverter circuit) for motor control and heating functions. On the one hand, heating through the resonant heating circuit avoids the short-circuit safety issues caused by PTC heating. On the other hand, by connecting the resonant heating circuit in series with any one of the inverter half-bridges in the three-phase inverter circuit, the carrier frequency value is determined based on the desired power value, voltage vector value, and circuit control parameters. Controlling the motor and resonant heating circuit based on the carrier frequency value reduces the use of the PTC heater (replacing it with the resonant heating circuit), vehicle PTC heater controller, and PTC heater control circuit, thereby reducing the implementation cost of motor control and heating functions. Attached Figure Description

[0036] Figure 1 This is a flowchart illustrating the first embodiment of the control method for motor and resonant heating according to this application;

[0037] Figure 2 This is a waveform diagram showing the output power and frequency in the three-phase inverter circuit of this application;

[0038] Figure 3This is a waveform diagram of a carrier wave and power in the resonant heating circuit of this application;

[0039] Figure 4 This is a schematic diagram of the connection between the motor and the resonant heating control method in this application;

[0040] Figure 5 This is a schematic diagram of the first implementation process of the control method for motor and resonant heating in this application;

[0041] Figure 6 This is a schematic diagram of the second implementation process of the control method for motor and resonant heating in this application;

[0042] Figure 7 This is a schematic diagram of the third implementation process of the control method for motor and resonant heating in this application;

[0043] Figure 8 This is a schematic diagram of the controller structure of the hardware operating environment involved in the embodiments of the present invention;

[0044] Figure 9 This is a schematic diagram of the controller module of the present invention.

[0045] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0046] Explanation of icon numbers:

[0047] V DC 1. External power supply; 21. First inverter bridge arm; 22. Second inverter bridge arm; 23. Third inverter bridge arm; 10. Resonant heating circuit; M. Motor; S1. First switch; S2. Second switch; S3. Third switch; S4. Fourth switch; S5. Fifth switch; S6. Sixth switch; S7. Turn-on switch; R1. Equivalent resistance; C1. Resonant capacitor; L1. Resonant inductor; RX. Equivalent sampling resistor; RV. Second sampling resistor; RU. Third sampling resistor; W. First phase input terminal; V. Second phase input terminal; U. Third phase input terminal. Detailed Implementation

[0048] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0049] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0050] PTC heaters are widely used in automobiles, primarily for preheating the engine in winter and heating the passenger compartment. To adjust their heating power, an onboard PTC heater controller is typically used. This controller adjusts the PTC heater's settings by changing the number of switches or adjusting the duty cycle. However, PTC heaters are prone to dry burning and thermal runaway due to their inherent heating properties. Therefore, high-frequency resonant heating has emerged as a solution. High-frequency resonant heating offers advantages such as a simple control environment (a half-bridge topology is sufficient), fewer power devices, low cost, and excellent robustness. The maximum power output point of this topology is located precisely at the resonant frequency, while also achieving the highest efficiency. The control drawback of the above resonant heating circuit is that the control topology and the inverter circuit that controls the motor itself need to be set up separately. Taking the three-phase inverter circuit as an example, the control topology contains 2 switching transistors, while the three-phase inverter circuit contains 6 switching transistors. On the one hand, this will increase the complexity and cost of the devices that need to realize motor control and heating. On the other hand, the two control circuits need to be arranged separately, which will increase the overall device layout area. Due to the increase in the number of switching transistors, more area is needed to arrange the circuit, which in turn makes the device larger.

[0051] Therefore, based on the shortcomings of the above-mentioned methods for implementing motor control and heating functions, this application proposes a control method for motor and resonant heating: The resonant heating circuit is connected within a compressor controller between the midpoints of the two bridge arms in a three-phase inverter circuit. The carrier frequency value is determined by the desired power value, voltage vector value, and circuit control parameters. Control of the motor and resonant heating circuit is then based on this carrier frequency value. This avoids the need for separate controllers and control circuits (including a PTC heater, an on-board PTC heater controller, a motor controller, and an inverter circuit) for both motor control and heating functions. On one hand, heating via the resonant heating circuit avoids the short-circuit safety issues caused by PTC heating. On the other hand, by connecting the resonant heating circuit in series with any one of the inverter half-bridges in the three-phase inverter circuit, and then determining the carrier frequency value based on the desired power value, voltage vector value, and circuit control parameters, control of the motor and resonant heating circuit is achieved. This reduces the use of the PTC heater (replacing it with a resonant heating circuit), the on-board PTC heater controller, and the PTC heater control circuit, thereby lowering the implementation cost of the motor control and heating functions.

[0052] In one embodiment of this application, reference is made to Figure 1 , Figure 1This is a flowchart illustrating the first embodiment of the motor and resonant heating control method of this application. The motor and resonant heating control method is applied to a compressor controller connected to a motor M. The compressor controller includes a three-phase inverter circuit 20 and a resonant heating circuit 10. The resonant heating circuit 10 is connected between the midpoints of two bridge arms in the three-phase inverter circuit 20. The motor and resonant heating control method includes:

[0053] Step S10: Obtain the control parameter information of the compressor controller, wherein the control parameter information includes the voltage vector value of the three-phase inverter circuit, the circuit control parameters of the resonant heating circuit, and the preset expected power value;

[0054] For example, in the resonant heating circuit 10 (a circuit consisting of a resonant inductor L1, a resonant capacitor C1, and an equivalent resistance R1 connected in series), the resonant element performs high-frequency electromagnetic induction heating, thereby controlling the frequency of the entire circuit to achieve controllable heating. The total impedance formula of the resonant heating circuit 10 is Z = R + j(wL-1 / wC), where w is the carrier angular frequency of the PWM (Pulse Width Modulation) wave in the three-phase inverter circuit 20, and the carrier angular frequency w = 2πf = 2π / T, where f is the carrier frequency of the PWM and T is the carrier period of the PWM. According to relevant power formulas (such as resistive heating power) and the total impedance formula, it can be seen that the frequency of the induction heating output determines the equivalent impedance. The magnitude of the equivalent impedance can be changed by adjusting the frequency, thereby controlling the heating power. Further details can be found by referring to… Figure 2 , Figure 2 This is a waveform diagram illustrating the output power and frequency in the three-phase inverter circuit of this application. In the diagram, P represents the actual output power of the circuit, P0 represents the output power at circuit resonance, f represents the actual operating frequency, and f0 represents the resonant frequency of the circuit itself. Actual control is achieved by setting f>=f0 for electromagnetic induction heating power control; generally, the resonant point is set >=10kHz. Further details can be found in... Figure 3 , Figure 3 This is a waveform diagram of a carrier wave and power in the resonant heating circuit of this application. In practical applications, the QL value of the inductor determines the attenuation of different carrier waves. Therefore, an inductor with a high QL value needs to be designed for power-regulated half-bridge electromagnetic heating. The power formula for the resonant heating circuit 10 is as follows:

[0055] Preq = U 线电压 ^2 / Z (1)

[0056] Wherein, U-line voltage is the voltage vector Us corresponding to the bus voltage Udc, U-line voltage = Us / √2, and Z is the magnitude of the total impedance:

[0057]

[0058] Among them, the resonant angular frequency of the resonant circuit is wr=1 / √LC, the resonant frequency is fr=1 / 2π√LC, the quality factor is QL=wrL / R=1 / wrRC, and ω is the carrier angular frequency. Therefore, the carrier frequency of the resonant heating circuit 10 can be controlled based on the power formula (1) and formula (2) to realize the heating control of the resonant heating circuit 10.

[0059] In this embodiment, when controlling the motor and resonant heating, the control parameter information of the compressor controller is obtained, and then the control of the motor and resonant heating circuit 10 is realized based on the control parameter information. The control parameter information includes the voltage vector value of the three-phase inverter circuit, the circuit control parameters of the resonant heating circuit, and the preset desired power value. Specifically, the voltage vector value refers to the voltage vector provided to the three-phase inverter circuit 20, such as the voltage vector labeled Udc; the circuit control parameters refer to the parameters of each component in the resonant heating circuit, such as the numerical parameters of resistance, capacitance, and inductance; and the desired power value refers to the power value defined by the user. Based on these parameters, the carrier frequency of the PWM controlling the resonant heating circuit 10 can be determined, and the resonant heating circuit 10 can be controlled based on this carrier frequency to achieve heating. Simultaneously, the motor is controlled based on the PWM duty cycle to achieve motor control and heating of the resonant heating circuit 10. This reduces the cost of motor control and resonant heating circuit 10 heating, and also avoids the dry burning and thermal runaway problems caused by PTC (which lacks related protection control and signal control).

[0060] Step S20: Determine the carrier frequency value based on the desired power value, voltage vector value, and circuit control parameters;

[0061] Step S30: Control the motor and resonant heating circuit according to the carrier frequency value.

[0062] In this embodiment, after obtaining the desired power value, voltage vector value, and circuit control parameters, the carrier frequency value is determined based on the desired power value, voltage vector value, and circuit control parameters. That is, the carrier angular frequency ω is determined by referring to formulas (1) and (2). Then, the resonant heating circuit 10 is controlled to heat the circuit based on the carrier angular frequency ω, i.e., w = 2πf, where f is the carrier frequency. At the same time, since w = 2πf = 2π / T, i.e., ω is related to the carrier period of PWM, it will indirectly affect the duty cycle. Then, the motor is controlled based on the affected duty cycle to achieve simultaneous control of the motor and heating. On the one hand, the electromagnetic heating method avoids the short circuit and dry burning phenomena that may occur during PTC heating, improving the safety and reliability of the system. On the other hand, the existing motor control inverter circuit is used to realize the motor control and electromagnetic heating functions, thereby reducing the cost of motor control and electromagnetic heating. It is worth noting that the impedance formula can be:

[0063]

[0064] By combining formulas (1) and (3), a new carrier frequency value is determined, and then the resonant heating circuit 10 is controlled according to the new carrier frequency value. At this time, precise control of electromagnetic heating and motor power can be achieved by adjusting the carrier frequency and the effective duty cycle of the motor, simplifying the control strategy. In summary, this invention achieves efficient, safe, and reliable heating function of the air conditioning system for new energy vehicles by using electromagnetic heating and utilizing a motor-controlled inverter circuit.

[0065] In one embodiment, a control method for a motor and resonant heating is provided, applied to a compressor controller connected to a motor. The compressor controller includes a three-phase inverter circuit and a resonant heating circuit. The resonant heating circuit is connected between the midpoints of two bridge arms in the three-phase inverter circuit. The method involves acquiring control parameter information from the compressor controller, including the voltage vector value of the three-phase inverter circuit, the circuit control parameters of the resonant heating circuit, and a preset desired power value. A carrier frequency value is determined based on the desired power value, voltage vector value, and circuit control parameters. The motor and resonant heating circuit are then controlled according to the carrier frequency value. This control method for a motor and resonant heating is applied in a compressor controller where the resonant heating circuit is connected between the midpoints of two bridge arms in the three-phase inverter circuit, and the carrier frequency value is determined using the desired power value, voltage vector value, and circuit control parameters. This invention controls the motor and resonant heating circuit based on the carrier frequency value, thus avoiding the need for separate controllers and control circuits (including PTC heater, vehicle PTC heater controller, motor controller, and inverter circuit) for motor control and heating functions. On the one hand, heating through the resonant heating circuit avoids the short-circuit safety issues caused by PTC heating. On the other hand, by connecting the resonant heating circuit in series with any one of the inverter half-bridges in the three-phase inverter circuit, the carrier frequency value is determined based on the desired power value, voltage vector value, and circuit control parameters. Controlling the motor and resonant heating circuit based on the carrier frequency value reduces the use of the PTC heater (replacing it with the resonant heating circuit), vehicle PTC heater controller, and PTC heater control circuit, thereby reducing the implementation cost of motor control and heating functions.

[0066] Furthermore, based on the first embodiment of the control method for motor and resonant heating described above, a second embodiment of the control method for motor and resonant heating of this application is proposed, comprising the step of determining the carrier frequency value based on the desired power value, voltage vector value, and circuit control parameters, including:

[0067] Step S21: Determine the line voltage value corresponding to the voltage vector value, and use the quotient of the square of the line voltage value and the desired power value as the impedance value;

[0068] Step S22: Determine the carrier frequency value based on the impedance value and circuit control parameters within the preset impedance rules.

[0069] In this embodiment, when it is necessary to determine the carrier frequency value, the line voltage value corresponding to the voltage vector value is preferentially used, that is, the value of Us / √2 is determined as the line voltage value based on the voltage vector value Us. Then, the quotient of the square of the line voltage value and the expected power value is used as the impedance value, that is, |Z| is determined based on formula (1). Finally, the carrier frequency value can be determined based on the known |Z| and the circuit control parameters (such as the resistance, inductance and capacitance values ​​in the resonant heating circuit). The preset impedance rule can be formula (2) or formula (3) in the above embodiment. Two carrier frequency values ​​f can also be determined based on the above two methods. Then, the average value of the two carrier frequency values ​​f is determined as the carrier frequency value f. Then, the resonant heating circuit 10 can be heated based on the carrier frequency value f. The original separate heating control circuit can be integrated into the existing motor control circuit. Then, the functions of motor control and resonant heating circuit 10 heating can be realized based on one circuit to reduce the implementation cost of the two functions. Further, refer to Figure 4 , Figure 4 This is a connection diagram of the control method for motor and resonant heating in this application. Since the resonant heating circuit is connected at the midpoint of any two bridge arms, the coordinated control of the motor and the resonant heating circuit needs to be considered. This is an embodiment of the coordinated control of the motor and the resonant heating circuit, referring to... Figure 5 , Figure 5 This is a schematic diagram of the first implementation process of the control method for motor and resonant heating in this application. At this time, the motor control program is started, and the motor is controlled normally. At the same time, the output line voltage U1 is determined based on the voltage vector Us at this time (because it is connected at the midpoint of the bridge arm, so the line voltage is considered). Then, based on the expected electromagnetic heating power Preq at this time, |Z| can be determined based on formula (1). Then, the required carrier frequency value f can be determined according to formula (3) or formula (2). The resonant heating circuit can be controlled based on the carrier frequency value f at this time to control the entire instrument to heat, while ensuring motor control at the same time. This can reduce the cost of motor control and heating control.

[0070] In one embodiment, the step of controlling the motor and the resonant heating circuit according to the carrier frequency value includes:

[0071] Step S31: Control the resonant heating circuit based on the carrier frequency value;

[0072] Step S32: Determine the waveform duty cycle corresponding to the carrier frequency value, and control the motor based on the waveform duty cycle.

[0073] In this embodiment, when the carrier frequency value is determined, the resonant heating circuit is controlled to operate at the desired power value based on the carrier frequency value, thereby realizing the heating control of the resonant heating circuit. At the same time, the waveform duty cycle corresponding to the carrier frequency value is also determined, and the motor is controlled to operate based on the waveform duty cycle. For example, if the period T of the PWM under the carrier frequency value A is B, and the desired control of the motor duty cycle is 50%, then the high and low level distribution of 0.5B is determined based on the changed period T, thereby simultaneously completing the control of heating and motor. At this time, only one resonant heating circuit connected to the three-phase inverter circuit can be used, thereby reducing the cost of implementing heating and motor control.

[0074] Furthermore, based on the first and / or second embodiments of the control method for motor and resonant heating described above, a third embodiment of the control method for motor and resonant heating described above is proposed. Before the step of obtaining the control parameter information of the compressor controller, the method includes:

[0075] Step S101: Upon receiving a heating command and a motor control command, execute the step of obtaining control parameter information of the compressor controller.

[0076] Step S102: When a heating command is received but no motor control command is received, the motor is controlled based on a preset high-frequency voltage vector, and the step of obtaining control parameter information of the compressor controller is executed.

[0077] In this embodiment, when controlling the motor and resonant heating circuit, it is necessary to determine the control requirements, i.e., whether to control the motor alone, the resonant heating circuit alone, or both simultaneously, and then perform targeted control based on the actual needs. If a heating command and a motor control command are received, the step of obtaining the control parameter information of the compressor controller is executed. The heating command refers to the user-inputted or automatically generated command that requires heating control of the resonant heating circuit, and the motor control command refers to the user-inputted or automatically generated command that requires motor control. In other words, the method of using duty cycle for motor control and carrier frequency for heating control is directly executed, i.e., the above embodiment is executed. Conversely, when a heating command is received but no motor control command is received, i.e., only heating control is needed and motor control is not required, the motor can be controlled based on special control, thereby controlling the motor to not work but the resonant heating circuit to work normally. For permanent magnet synchronous motors, the equations in the dq coordinate system (rotor flux-oriented synchronous rotating coordinate system) can be directly given. Generally, it is described by voltage equations and flux equations:

[0078] Its stator voltage equation:

[0079]

[0080] Magnetic flux linkage equation:

[0081]

[0082] Substituting the flux linkage equation (5) into the voltage equation (4), we get:

[0083]

[0084] In equations (4) to (6) above, p is the differential operator, u, ψ, i, and ω are voltage, flux linkage, current, and velocity (electric angular velocity), respectively. Since the back electromotive force of the permanent magnet is 0, ψf*p = 0. Ψf is the flux linkage of the permanent magnet, and Lsd, Lsq, and Rs are the d-axis and q-axis inductances and stator resistance, respectively. Because in the open-loop voltage stage, given a very high frequency, the motor does not run, which is equivalent to its Ψf being the permanent magnet flux linkage being 0 and the Q-axis current being 0. The differential operator can be ignored, and its motor equation is equivalent to:

[0085] u s ≈u sd =R s i sd -ωL sq i sd (7)

[0086] The current equation is obtained by transforming the motor equation:

[0087] i s ≈i sd =u s / (R s -ωL sq (8)

[0088] According to equation (8), if the injected rotational speed w is high enough, the motor phase current will be so small as to be negligible. Therefore, the motor can be controlled based on a preset high-frequency voltage vector, and the steps of obtaining control parameter information from the compressor controller can be performed. At this point, the motor circuit can be controlled to approximately zero based on formula (8), and the motor will stop working. Further details can be found by referring to... Figure 6 , Figure 6This is a schematic diagram of the second implementation process of the control method of motor and resonant heating in this application. When the motor does not need to work, the motor control is given a voltage vector Us by formula (8), and the rotation speed w and electrical angle, i.e., Lsq, can be given at the same time. Then the motor can be controlled not to run. At this time, the output line voltage U1 is determined based on the voltage vector Us at this time (because it is connected at the midpoint of the bridge arm at this time, so the line voltage is considered). Then, based on the expected electromagnetic heating power Preq at this time, |Z| at this time can be determined based on formula (1). Then, the required carrier frequency value f is determined according to formula (3) or formula (2). The resonant heating circuit can be controlled based on the carrier frequency value f at this time to control the entire instrument to heat, while ensuring motor control at the same time, thereby reducing the cost of separate heating control.

[0089] In one embodiment, the control method for the motor and resonant heating further includes:

[0090] Step S40: When no heating command is received, a preset carrier threshold is used as the carrier frequency value, and the step of controlling the motor and resonant heating circuit according to the carrier frequency value is executed.

[0091] In this embodiment, when the motor needs to be turned on but the electromagnetic heating is not turned on, based on the connection method of the resonant heating circuit, on the one hand, a switch can be directly designed in the resonant heating circuit for control; on the other hand, based on formulas (1) and (2), it can be determined that the output power of the resonant heating circuit is actually related to the frequency, and thus the carrier frequency can be directly increased to make the electromagnetic heating power extremely low. The motor power is controlled by the effective duty cycle of the motor, thereby realizing individual motor control. Here, the preset carrier threshold refers to the maximum carrier frequency value at which the motor can work normally, and this maximum carrier frequency value can control the resonant heating circuit to stop working. (See reference...) Figure 7 , Figure 7 This is a schematic diagram of the third implementation process of the control method for motor and resonant heating in this application. When only motor control is required, the motor is directly controlled based on the motor control program. At the same time, the line voltage U1 of the control motor and the resonant heating circuit is normally output. However, in order to prevent the resonant heating circuit from working, the carrier frequency is increased to the highest value at the motor control terminal, thereby increasing the value to the highest value of |Z|, which is equivalent to turning off the heating function of the resonant heating circuit to ensure the accuracy of motor control alone.

[0092] Furthermore, refer to Figure 8 , Figure 8 This is a schematic diagram of the controller structure of the hardware operating environment involved in the embodiments of the present invention.

[0093] like Figure 8As shown, the controller may include: a processor 0003, such as a central processing unit (CPU), a communication bus 0001, an acquisition interface 0002, a processing interface 0004, and a memory 0005. The communication bus 0001 is used to enable communication between these components. The acquisition interface 0002 may include an information acquisition device or acquisition unit, such as a computer; optionally, the acquisition interface 0002 may also include a standard wired interface or a wireless interface. The processing interface 0004 may optionally include a standard wired interface or a wireless interface. The memory 0005 may be high-speed random access memory (RAM) or stable non-volatile memory (NVM), such as a disk storage device. Optionally, the memory 0005 may also be a storage device independent of the aforementioned processor 0003.

[0094] Those skilled in the art will understand that Figure 8 The structure shown does not constitute a limitation on the controller and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0095] like Figure 8 As shown, the memory 0005, which serves as a computer storage medium, may include an operating system, an acquisition interface module, a processing interface module, and a current detection program for power devices executed by a controller.

[0096] exist Figure 8 In the controller shown, the communication bus 0001 is mainly used to realize the connection and communication between components; the acquisition interface 0002 is mainly used to connect to the backend server and communicate with the backend server; the processing interface 0004 is mainly used to connect to the deployment end (user end) and communicate with the deployment end; the processor 0003 and the memory 0005 in the controller of the present invention can be set in the controller. The controller calls the current detection program of the power device stored in the memory 0005 through the processor 0003 and executes the current detection circuit of the power device provided in the embodiment of the present invention.

[0097] The present invention also provides a controller, which (can be an integrated controller for motor control) is installed within the compressor controller and connected to the three-phase inverter circuit and the resonant heating circuit, as described above. Figure 9 , Figure 9 This is a schematic diagram of the controller module of the present invention. The controller includes:

[0098] Information acquisition module A01 is used to acquire control parameter information of the compressor controller, wherein the control parameter information includes the voltage vector value of the three-phase inverter circuit, the circuit control parameters of the resonant heating circuit, and the preset expected power value;

[0099] Frequency determination module A02 is used to determine a carrier frequency value based on the desired power value, the voltage vector value, and the circuit control parameters;

[0100] The carrier control module A03 is used to control the motor and the resonant heating circuit according to the carrier frequency value.

[0101] The methods executed by the above-mentioned program modules can be referred to in the various embodiments of the control method for motor and resonant heating of the present invention, and will not be repeated here.

[0102] The present invention also provides a computer-readable storage medium.

[0103] The present invention provides a computer-readable storage medium storing a control program for a motor and resonant heating executed by a controller, wherein when the control program for the motor and resonant heating is executed by a processor, the steps of the control method for the motor and resonant heating described above are implemented.

[0104] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the data management method described above.

[0105] The computer program product provided in this application can solve the technical problem of high implementation cost of motor control and heating functions. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as the beneficial effects of the motor and resonant heating control method provided in the above embodiments, and will not be repeated here.

[0106] Based on the first, second and / or third embodiments of the control method for motor and resonant heating of this application, this application also proposes a first embodiment of a vehicle-mounted compressor, which includes a compressor controller, a motor M and a compression unit, wherein the compressor controller is connected to the motor M and the motor is connected to the compression unit.

[0107] The compressor controller includes a three-phase inverter circuit 20, a resonant heating circuit 10, and a controller. The resonant heating circuit 10 is connected between the midpoints of the two bridge arms of the three-phase inverter circuit 20. The controller is connected to both the three-phase inverter circuit 20 and the resonant heating circuit 10. The output terminal of the three-phase inverter circuit 20 is connected to the motor M. The compressor controller (executed within the controller) performs the aforementioned control method for the motor and resonant heating.

[0108] It is worth noting that, according to the vehicle-mounted compressor of this application embodiment, the controller in the vehicle-mounted compressor executes a control program for the motor and resonant heating: acquiring control parameter information of the compressor controller, wherein the control parameter information includes the voltage vector value of the three-phase inverter circuit, the circuit control parameters of the resonant heating circuit, and the preset desired power value; determining the carrier frequency value based on the desired power value, voltage vector value, and circuit control parameters; and controlling the motor and resonant heating circuit based on the carrier frequency value. Thus, on the one hand, heating through the resonant heating circuit can avoid the short-circuit safety problem caused by PTC heating; on the other hand, by connecting the resonant heating circuit in series with any one of the inverter half-bridges in the three-phase inverter circuit, and then determining the carrier frequency value based on the desired power value, voltage vector value, and circuit control parameters, and controlling the motor and resonant heating circuit based on the carrier frequency value, the use of the PTC heater (replacing it with the resonant heating circuit for heating), the vehicle-mounted PTC heater controller, and the control circuit of the PTC heater can be reduced, thereby reducing the implementation cost of the motor control and heating functions. It is worth noting that the three-phase inverter circuit 20 and the resonant heating circuit 10 can also be set in other locations, such as a fan with a heating function. In other words, as long as there is an inverter circuit controlled by a motor and there is a heating requirement, the three-phase inverter circuit 20 and the resonant heating circuit 10 of this application can be set up and the motor and resonant heating control method of this application can be executed. No specific application scenarios or instruments are limited here.

[0109] The vehicle-mounted compressor controls the movement of the motor M. Simultaneously, a resonant heating circuit 10 is connected to the three-phase inverter circuit 20 of the motor M. Through the control program for the motor and resonant heating in this embodiment, simultaneous control of the motor and resonant heating circuit can be achieved (i.e., on the basis of the original single motor control circuit, the resonant heating circuit 10 is directly connected, so that the resonant heating effect can be additionally achieved based on the control program for the motor and resonant heating), or control of either the motor or the resonant heating circuit separately. This reduces the need for a PTC heater (replaced with a resonant heating circuit), a vehicle-mounted PTC heater controller, and a PTC heater control circuit, thereby lowering the implementation cost of motor control and heating functions.

[0110] Furthermore, based on the first embodiment of the vehicle-mounted compressor of this application described above, referring to... Figure 2 The second embodiment of the on-board compressor of this application is proposed, wherein the midpoint of the bridge arm includes the midpoint of the first bridge arm and the midpoint of the second bridge arm connected by the resonant heating circuit 10, and the resonant heating circuit 10 includes:

[0111] The equivalent resistance R1 is connected to the midpoint of the first bridge arm.

[0112] Resonant capacitor C1, with its first terminal connected to the second terminal of the equivalent resistance R1;

[0113] Resonant inductor L1, with its first terminal connected to the second terminal of resonant capacitor C1;

[0114] The conducting switch S7 is turned on. The first end of the conducting switch S7 is connected to the second end of the resonant inductor L1, and the second end of the conducting switch S7 is connected to the midpoint of the second bridge arm.

[0115] In this embodiment, the resonant heating circuit 10 includes an equivalent resistance R1, a resonant capacitor C1, and a resonant inductor L1. Its principle is the same as that of a commonly used RLC resonant circuit, primarily relying on RLC for heating. The specific selection and parameter selection of the equivalent resistance R1, resonant capacitor C1, and resonant inductor L1 can be chosen according to actual conditions. Furthermore, to accurately control the operation and standby of the resonant heating circuit 10, a switching transistor S7 can be connected (although the control method of this application may not use a switching transistor, or the switching transistor may be continuously in a conducting state). Then, the motor controller 30 can send a control signal to the third terminal (the control terminal of the switching transistor S7) of the switching transistor S7 to control its on / off state, thereby realizing the operation and standby of the resonant heating circuit 10. It is worth noting that the above is only one connection relationship between the equivalent resistance R1, resonant capacitor C1, resonant inductor L1 and conducting switch S7. Other connection relationships are also possible, such as setting the conducting switch S7 at the first end of the equivalent resistance R1. Adaptive connections can also be made according to the actual situation and user selection, which are not limited here.

[0116] Furthermore, based on the first and / or second embodiments of the vehicle-mounted compressor of this application described above, a third embodiment of the vehicle-mounted compressor of this application is proposed. The three-phase inverter circuit 20 includes a first inverter bridge arm 21, a second inverter bridge arm 22, and a third inverter bridge arm 23. Two of the bridge arm midpoints of the first inverter bridge arm 21, the second inverter bridge arm 22, and the third inverter bridge arm 23 are connected to the resonant heating circuit 10.

[0117] Furthermore, the motor M includes a first-phase input terminal W, a second-phase input terminal V, and a third-phase input terminal U, and the three-phase inverter circuit 20 also includes:

[0118] Motor controller;

[0119] The first end of the first inverter bridge arm 21 is connected to the external power supply V. DC The positive terminal is connected, and the second end of the first inverter bridge arm 21 is connected to the external power supply V. DC The negative terminal is connected, and the midpoint of the first inverter bridge arm 21 is connected to the first phase input terminal W.

[0120] The first end of the second inverter bridge arm 22 is connected to the external power supply V. DC The positive terminal is connected, and the second end of the second inverter bridge arm 22 is connected to the external power supply V. DC The negative terminal is connected, and the midpoint of the second inverter bridge arm 22 is connected to the second phase input terminal V;

[0121] The third terminal of the third inverter bridge arm 23 is connected to the external power supply V. DC The positive terminal is connected, and the second end of the third inverter bridge arm 23 is connected to the external power supply V. DC The negative terminal is connected, and the midpoint of the third inverter bridge arm 23 is connected to the third phase input terminal U. The control terminals of the switching transistors in the first inverter bridge arm 21, the second inverter bridge arm 22 and the third inverter bridge arm 23 are connected to the motor controller.

[0122] For example, the three-phase inverter circuit 20 includes three inverter bridge arms, namely the first inverter bridge arm 21, the second inverter bridge arm 22 and the third inverter bridge arm 23. Each bridge arm is composed of two switching transistors connected in series. The connection point of the two switching transistors serves as the midpoint of the bridge arm and is connected to the first phase input terminal U, the second phase input terminal V and the third phase input terminal W of the motor M. The two ends of the connection between the two switching transistors are respectively connected to the negative terminal HV- and the positive terminal HV+ of the external power supply 100, thereby forming the three-phase inverter circuit 20. It is worth noting that the first switching transistor S1 to the sixth switching transistor S6 and the turn-on switching transistors S7 to S9 can all be IGBTs (Insulated Gate Bipolar Transistors), MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors), or other types. There are no restrictions on the type of switching transistors. Therefore, based on the above three-phase inverter circuit 20, the motor M can be controlled normally. Simultaneously, the resonant heating circuit 10 shares its internal half-bridge, thus enabling resonant heating of the resonant heating circuit 10. It is also worth noting that the external power supply V... DC The device used to provide bus voltage, the resonant heating circuit 10 can be set between any two midpoints of the first inverter bridge arm 21, the second inverter bridge arm 22, and the third inverter bridge arm 23, and the number of resonant heating circuits 10 can be selected according to actual needs.

[0123] In one embodiment, the compressor controller is further provided with a sampling circuit, which includes a first sampling circuit connected to the first inverter bridge arm 21, a second sampling circuit connected to the second inverter bridge arm 22, and a third sampling circuit connected to the third inverter bridge arm 23. The first sampling circuit, the second sampling circuit, and the third sampling circuit are composed of sampling resistors and sampling operational amplifiers.

[0124] In this embodiment, since current may be required in the entire motor control, corresponding sampling circuits can be set up and connected to the corresponding inverter bridge arms. For example, the equivalent sampling resistor RX can work with the sampling operational amplifier to acquire the power supply current ibus of the external power supply Vdc; the second sampling resistor RV can work with the sampling operational amplifier to acquire the second phase current lv of the second phase input terminal V; the third sampling resistor RU can work with the sampling operational amplifier to acquire the third phase current lu of the third phase input terminal U; and the fourth sampling resistor RL can work with the sampling operational amplifier to acquire the second sampling current (the current flowing through the resonant heating circuit 10) lReq. Figure 2 The first sampling resistor, which is not shown in the figure, can be used in conjunction with the sampling operational amplifier to realize the acquisition of the first phase current at the first phase input terminal W. The composition of its first sampling circuit, second sampling circuit, third sampling circuit and fourth sampling circuit can be the commonly used sampling circuit, and is not limited here.

[0125] The device provided in this application can solve the technical problem of high implementation cost of motor control and heating functions. Compared with the prior art, the beneficial effects of the device provided in this application are the same as those of the motor and resonant heating control method provided in the above embodiments, and will not be repeated here.

[0126] This application also provides a vehicle that includes the aforementioned on-board compressor.

[0127] It is worth noting that the vehicle-mounted compressor can be installed in the vehicle to address the technical challenge of high costs associated with implementing motor control and heating functions. It is also worth noting that other hardware can be installed in the vehicle, which will not be detailed here. The entire vehicle-mounted compressor can be installed in the vehicle or in other products; this is not a limitation.

[0128] The device provided in this application can solve the technical problem of high implementation cost of motor control and heating functions. Compared with the prior art, the beneficial effects of the vehicle provided in this application are the same as the beneficial effects of the motor and resonant heating control method provided in the above embodiments, and will not be repeated here.

[0129] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A control method of an electric motor and resonant heating, characterized by, The control method for the motor and resonant heating is applied to a compressor controller connected to the motor. The compressor controller includes a three-phase inverter circuit and a resonant heating circuit. The resonant heating circuit is connected between the midpoints of two bridge arms of the three-phase inverter circuit. The control method for the motor and resonant heating includes: Obtain the control parameter information of the compressor controller, wherein the control parameter information includes the voltage vector value of the three-phase inverter circuit, the circuit control parameters of the resonant heating circuit, and the preset expected power value; The carrier frequency value is determined based on the desired power value, the voltage vector value, and the circuit control parameters; The motor and the resonant heating circuit are controlled according to the carrier frequency value.

2. The method of claim 1, wherein the motor and resonant heating are controlled by a controller. The step of determining the carrier frequency value based on the desired power value, the voltage vector value, and the circuit control parameters includes: Determine the line voltage value corresponding to the voltage vector value, and use the quotient of the square of the line voltage value and the desired power value as the impedance value; The carrier frequency value is determined based on the impedance value and the circuit control parameters within a preset impedance rule.

3. The method of claim 1, wherein the motor and resonant heating are controlled by a controller. Before the step of obtaining the control parameter information of the compressor controller, the following steps are included: Upon receiving a heating command and a motor control command, the step of obtaining the control parameter information of the compressor controller is executed. When a heating command is received but no motor control command is received, the motor is controlled based on a preset high-frequency voltage vector, and the step of obtaining the control parameter information of the compressor controller is executed.

4. A method of controlling a motor and resonant heating as claimed in any one of claims 1 to 3, characterized in that, The step of controlling the motor and the resonant heating circuit according to the carrier frequency value includes: The resonant heating circuit is controlled based on the carrier frequency value; Determine the waveform duty cycle corresponding to the carrier frequency value, and control the motor based on the waveform duty cycle.

5. The control method for motor and resonant heating as described in any one of claims 1 to 3, characterized in that, The control method for the motor and resonant heating also includes: When no heating command is received, a preset carrier threshold is used as the carrier frequency value, and the step of controlling the motor and the resonant heating circuit according to the carrier frequency value is executed.

6. A vehicle-mounted compressor, characterized in that, The vehicle-mounted compressor includes a compressor controller, a motor, and a compression unit. The compressor controller is connected to the motor, and the motor is connected to the compression unit. The compressor controller includes a three-phase inverter circuit, a resonant heating circuit, and a controller. The resonant heating circuit is connected between the midpoints of the two bridge arms of the three-phase inverter circuit. The controller is connected to both the three-phase inverter circuit and the resonant heating circuit. The output terminal of the three-phase inverter circuit is connected to the motor. The compressor controller executes the motor and resonant heating control method as described in any one of claims 1 to 5.

7. The vehicle-mounted compressor as described in claim 6, characterized in that, The midpoint of the bridge arm includes the midpoint of the first bridge arm and the midpoint of the second bridge arm connected by the resonant heating circuit. The resonant heating circuit includes: Equivalent resistance, wherein the first end of the equivalent resistance is connected to the midpoint of the first bridge arm; A resonant inductor, wherein the first end of the resonant inductor is connected to the second end of the equivalent resistance; A resonant capacitor, wherein the first end of the resonant capacitor is connected to the second end of the resonant inductor, and the second end of the resonant capacitor is connected to the midpoint of the second bridge arm.

8. The vehicle-mounted compressor as described in claim 6, characterized in that, The three-phase inverter circuit includes a first inverter bridge arm, a second inverter bridge arm, and a third inverter bridge arm. Two of the bridge arm midpoints of the first inverter bridge arm, the second inverter bridge arm, and the third inverter bridge arm are connected to the resonant heating circuit.

9. The vehicle-mounted compressor as described in claim 8, characterized in that, The motor includes a first-phase input terminal, a second-phase input terminal, and a third-phase input terminal. The three-phase inverter circuit further includes: Motor controller; The first end of the first inverter bridge arm is connected to the positive terminal of the external power supply, the second end of the first inverter bridge arm is connected to the negative terminal of the external power supply, and the midpoint of the first inverter bridge arm is connected to the first phase input terminal. The first end of the second inverter bridge arm is connected to the positive terminal of the external power supply, the second end of the second inverter bridge arm is connected to the negative terminal of the external power supply, and the midpoint of the second inverter bridge arm is connected to the second phase input terminal. The third end of the third inverter bridge arm is connected to the positive terminal of the external power supply, the second end of the third inverter bridge arm is connected to the negative terminal of the external power supply, and the midpoint of the third inverter bridge arm is connected to the third phase input terminal. The first inverter bridge arm, the second inverter bridge arm, and the third inverter bridge arm are composed of two series-connected switching transistors, and the control terminal of the switching transistors is connected to the motor controller.

10. The vehicle-mounted compressor as described in claim 8, characterized in that, The compressor controller is further provided with a sampling circuit, which includes a first sampling circuit connected to the first inverter bridge arm, a second sampling circuit connected to the second inverter bridge arm, and a third sampling circuit connected to the third inverter bridge arm. The first sampling circuit, the second sampling circuit, and the third sampling circuit are composed of sampling resistors and sampling operational amplifiers.

11. A vehicle, characterized in that, The vehicle includes the on-board compressor as described in any one of claims 6 to 10.

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