Motor control system, control method thereof, vehicle, and storage medium

Abstract

The invention discloses a motor control system, a control method thereof, a vehicle and a storage medium. The motor control system comprises a first inverter which is connected with a battery connection port and comprises N phases of first bridge arms; first ends of N-phase windings in the motor are correspondingly connected with neutral points of N-phase first bridge arms respectively; the second inverter comprises N-phase second bridge arms, and neutral points of the N-phase second bridge arms are correspondingly connected with the second ends of the N-phase windings respectively; the first relay is connected between the same end of the N-phase second bridge arm and the AC-to-DC module; the second relay is connected between the same end of the N-phase second bridge arm and the direct-current power supply connecting port; and the controller is connected with the first relay, the second relay, the N-phase first bridge arm and the N-phase second bridge arm, and is used for controlling the first relay, the second relay, the first inverter and the second inverter, so that the motor control system operates in a corresponding working mode. The technical problem of low control efficiency of the motor control system is solved.

Description

Technical Field

[0001] This application relates to the field of motor control, and more specifically, to a motor control system and control method thereof, a vehicle, and a storage medium. Background Technology

[0002] Currently, with the increasing demands for integration in electric drive and control systems, system integration has become an industry trend, leading to the increasingly widespread design and application of all-in-one electric drive systems. All-in-one systems aim to integrate key components such as the on-board charger (OBC), motor controller, and reducer to achieve a more efficient and compact vehicle powertrain.

[0003] However, current all-in-one system designs face several technical challenges and limitations, particularly in applications involving motor control systems for open-winding motors. In all-in-one motor control system designs, the reuse of converters and motor windings is limited, typically only allowing reuse of the inverter on the open-winding motor side. This restricts the potential for efficiency improvements in the motor control system, resulting in persistent technical issues related to low control efficiency.

[0004] Therefore, no effective solution has yet been proposed to address the above-mentioned problems. Summary of the Invention

[0005] This application provides a motor control system and its control method, a vehicle, and a storage medium to at least solve the technical problem of low control efficiency in motor control systems.

[0006] According to one aspect of the embodiments of this application, a motor control system is provided. The motor control system includes: a battery connection port, a first inverter, a motor, a second inverter, a first relay, a second relay, an AC-to-DC module, a DC power connection port, and a controller. The battery connection port is used to connect a battery. The first inverter, connected to the battery connection port, includes an N-phase first bridge arm. The motor includes an N-phase winding, with the first ends of the N-phase windings respectively connected to the neutral points of the N-phase first bridge arms. The second inverter includes an N-phase second bridge arm, with the neutral points of the N-phase second bridge arms respectively connected to the second ends of the N-phase windings. The first relay is connected between the same end of the N-phase second bridge arm and the AC-to-DC module. The second relay is connected between the same end of the N-phase second bridge arm and the DC power connection port. The controller is connected to the first relay, the second relay, the N-phase first bridge arm, and the N-phase second bridge arm, and is used to control the first relay, the second relay, the first inverter, and the second inverter to enable the motor control system to operate in a corresponding working mode, wherein the working mode includes one of a drive mode and a charging mode.

[0007] Optionally, a first relay is connected between the first end of the N-phase second bridge arm and the first end of the AC-to-DC module, wherein the first end of the N-phase second bridge arm is connected to the first side DC bus of the second inverter, the second end of the N-phase second bridge arm is connected to the second end of the AC-to-DC module, and the second end of the N-phase second bridge arm is connected to the second side DC bus of the second inverter; a second relay is connected between the first end of the N-phase second bridge arm and the positive port of the DC power connection port, wherein the negative port of the DC power connection port is connected to the second side DC bus of the second inverter.

[0008] Optionally, the motor control system further includes: a first capacitor connected in parallel with the second inverter; a controller for responding to a control signal corresponding to the drive mode, controlling the first relay, the second relay, the first inverter, and the second inverter to make the motor control system operate in the corresponding drive mode, wherein, in the N-phase first bridge arm, at least one phase upper bridge arm is in the same state as the remaining phase lower bridge arms, and in the N-phase second bridge arm, one phase upper bridge arm is in the same state as the remaining phase lower bridge arms, to charge the first capacitor; or, in the N-phase first bridge arm, one phase upper bridge arm is in the same state as the remaining phase lower bridge arms, and in the N-phase second bridge arm, one phase upper bridge arm is in the same state as the remaining phase lower bridge arms, to discharge the first capacitor and the battery; both the first relay and the second relay are in the open state.

[0009] Optionally, for charging the first capacitor, in the N-phase first bridge arm, at least one phase upper bridge arm is in a closed state, the remaining phase lower bridge arms are in a closed state, and the other bridge arms in the N-phase first bridge arm are in an open state; in the N-phase second bridge arm, at least one phase upper bridge arm is in a closed state, the remaining phase lower bridge arms are in a closed state, and the other bridge arms in the N-phase second bridge arm are in an open state.

[0010] Optionally, for discharging the first capacitor and the battery, in the first N-phase bridge arm, one phase upper bridge arm is in a closed state, the remaining phase lower bridge arms are in a closed state, and the other bridge arms in the first N-phase bridge arm are in an open state; in the second N-phase bridge arm, one phase upper bridge arm is in a closed state, the remaining phase lower bridge arms are in a closed state, and the other bridge arms in the second N-phase bridge arm are in an open state.

[0011] Optionally, the controller is used to control the first relay, the second relay, the first inverter, and the second inverter in response to the control signal corresponding to the charging mode, so that the motor control system operates in the corresponding charging mode, wherein in the N-phase first bridge arm, the state of one phase upper bridge arm is the same as the state of the other phase lower bridge arm; in the N-phase second bridge arm, the state of one phase upper bridge arm is the same as the state of the other phase lower bridge arms; one of the first relay and the second relay is in a closed state, and the other relay is in an open state.

[0012] Optionally, for AC charging mode, in the first N-phase bridge arm, one upper bridge arm is closed, the remaining lower bridge arm is closed, and the other bridge arms in the first N-phase bridge arm are open; in the second N-phase bridge arm, one upper bridge arm is closed, the remaining lower bridge arm is closed, and the other bridge arms in the second N-phase bridge arm are open; in the AC-to-DC module, one upper bridge arm is closed to connect to the positive terminal of the AC power supply, the remaining lower bridge arm is closed to connect to the negative terminal of the AC power supply, and the other bridge arms in the AC-to-DC module are open, with the AC power supply connected to the AC-to-DC module; the first relay is closed, and the second relay is open.

[0013] Optionally, for a DC charging mode, in the first N-phase bridge arm, one upper bridge arm is in a closed state, the other lower bridge arm is in a closed state, and the other bridge arms in the first N-phase bridge arm are in an open state; in the second N-phase bridge arm, one upper bridge arm is in a closed state, the other lower bridge arm is in a closed state, and the other bridge arms in the second N-phase bridge arm are in an open state; the first relay is in an open state, and the second relay is in a closed state.

[0014] Optionally, the motor control system further includes a second capacitor connected in parallel with the first inverter.

[0015] According to another aspect of the embodiments of this application, a control method for a motor control system is also provided. This method, applied to the motor control system of the embodiments of this application, includes: responding to a control signal corresponding to an operating mode of the motor control system, controlling a first relay, a second relay, a first inverter, and a second inverter to cause the motor control system to operate in the corresponding operating mode, wherein the operating mode includes one of a driving mode and a charging mode.

[0016] Optionally, in response to a control signal corresponding to the operating mode of the motor control system, the first relay, the second relay, the first inverter, and the second inverter are controlled to enable the motor control system to operate in the corresponding operating mode. This includes: in response to a control signal corresponding to the drive mode, controlling the first relay and the second relay to disconnect, and controlling the voltage of the first inverter to a first target voltage and the voltage of the second inverter to a second target voltage, so that the motor control system operates in the drive mode; wherein the first target voltage and the second target voltage are used to drive the motor to operate, and the battery is used to provide power to the motor in the drive mode.

[0017] Optionally, the motor control system includes a first capacitor connected in parallel with a second inverter. The method further includes: performing a charging operation on the first capacitor or a discharging operation on the first capacitor and the battery during the process of driving the motor to work through a first target voltage and a second target voltage.

[0018] Optionally, the charging mode includes an AC charging mode. Responding to a control signal corresponding to the operating mode of the motor control system, the system controls a first relay, a second relay, a first inverter, and a second inverter to enable the motor control system to operate in the corresponding mode. This includes: responding to the control signal corresponding to the AC charging mode, controlling the first relay to close, controlling the second relay to open, controlling the AC-to-DC module to convert the AC power supplied by the AC power source into a first initial DC power, and controlling the DC-to-DC module to perform a DC-to-DC conversion operation on the first initial DC power to obtain a first target DC power, thereby enabling the motor control system to operate in the AC charging mode. The AC power source is connected to the AC-to-DC module, which consists of a first inverter, motor windings, and a second inverter. The first target DC power is used to charge the battery.

[0019] Optionally, the charging mode includes a DC charging mode. In response to a control signal corresponding to the operating mode of the motor control system, the system controls a first relay, a second relay, a first inverter, and a second inverter to enable the motor control system to operate in the corresponding operating mode. This includes: responding to a control signal corresponding to the DC charging mode, controlling the first relay to open, controlling the second relay to close, and controlling the buck-boost module to perform a boost or buck operation on the second initial DC power supplied by the DC power supply to obtain a second target DC power, thereby enabling the motor control system to operate in the DC charging mode. The DC power supply is connected to a DC power supply connection port. The buck-boost module consists of a first inverter, motor windings, and a second inverter. The battery connection port is used to connect a battery, and the second target DC power is used to charge the battery.

[0020] According to another aspect of the embodiments of this application, a vehicle is also provided. The vehicle may include: a memory storing an executable program; and a processor for running the program, wherein the program executes the methods of the embodiments of this application when it runs.

[0021] According to another aspect of the embodiments of this application, a computer-readable storage medium is also provided. This computer-readable storage medium may include a stored executable program, wherein, when the executable program is executed, it controls the device where the storage medium is located to perform the method of the embodiments of this application.

[0022] According to another aspect of the embodiments of this application, a computer program product is also provided. This computer program product may include a computer program that, when executed by a processor, implements the method according to the embodiments of this application.

[0023] In this embodiment, the motor control system includes: a battery connection port, a first inverter, a motor, a second inverter, a first relay, a second relay, an AC-to-DC module, a DC power connection port, and a controller. The battery connection port is used to connect a battery. The first inverter is connected to the battery connection port and includes an N-phase first bridge arm. The motor includes an N-phase winding, with the first ends of the N-phase windings respectively connected to the neutral points of the N-phase first bridge arms. The second inverter includes an N-phase second bridge arm, with the neutral points of the N-phase second bridge arms respectively connected to the second ends of the N-phase windings. The first relay is connected between the same end of the N-phase second bridge arm and the AC-to-DC module. The second relay is connected between the same end of the N-phase second bridge arm and the DC power connection port. The controller is connected to the first relay, the second relay, the N-phase first bridge arm, and the N-phase second bridge arm, and is used to control the first relay, the second relay, the first inverter, and the second inverter to make the motor control system operate in a corresponding working mode, wherein the working mode includes one of a drive mode and a charging mode.

[0024] This application integrates a first inverter, a second inverter, a motor, a first relay, a second relay, and a controller to construct a motor control system capable of multiple operating modes. The neutral points of the first N-phase bridge arm in the first inverter and the second N-phase bridge arm in the second inverter are connected to the corresponding N-phase windings of the motor. The first relay is connected between the same end of the second N-phase bridge arm and the AC-to-DC module, and the second relay is connected between the same end of the second N-phase bridge arm and the DC power supply connection port. By controlling the first relay, the second relay, the first N-phase bridge arm of the first inverter, and the second N-phase bridge arm of the second inverter, the motor control system can seamlessly switch between drive and charging modes. Based on this, the motor control system can fully utilize the advantages of the motor in drive mode and reuse the first and second inverters and the N-phase windings of the motor in charging mode. This reduces hardware redundancy, avoids limited reuse of converters and motor windings, brings flexibility to the operation of the electric drive system, improves the control efficiency of the motor control system, and thus solves the technical problem of low control efficiency in motor control systems. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0026] Figure 1A This is a schematic diagram of a motor control system according to an embodiment of this application;

[0027] Figure 1B This is a schematic diagram of the topology of a motor control system according to an embodiment of this application;

[0028] Figure 2A This is a schematic diagram of capacitor charging in a driving mode according to an embodiment of the present invention;

[0029] Figure 2B This is a schematic diagram of capacitor charging in another driving mode according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the first capacitor and battery discharging under a driving mode according to an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of a motor control system in AC charging mode according to an embodiment of this application;

[0032] Figure 5 This is a schematic diagram of a motor control system in DC charging mode according to an embodiment of this application;

[0033] Figure 6 This is a flowchart of a control method for a motor control system according to an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of a motor drive system based on related technologies;

[0035] Figure 8 This is a schematic diagram of another motor drive system based on related technologies;

[0036] Figure 9 This is a schematic diagram of a control device applied to a motor control system according to an embodiment of this application;

[0037] Figure 10 This is a structural block diagram of a vehicle according to an embodiment of this application. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0039] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0040] This application provides a motor control system. This motor control system can be applied to motor control scenarios in intelligent driving trucks or unmanned trucks in the logistics and transportation field, motor control scenarios in autonomous agricultural vehicles in the agricultural machinery field, motor control scenarios in drones, and motor control scenarios in intelligent robots (such as cleaning robots, service robots, delivery robots, etc.), etc., without specific limitations. The motor control system can be deployed in vehicles.

[0041] Figure 1A This is a schematic diagram of a motor control system according to an embodiment of this application. Figure 1A As shown, the motor control system 10 may include: a battery connection port 11, a first inverter 12, a motor 13, a second inverter 14, a first relay 15, a second relay 16, an AC-to-DC module 17, a DC power connection port 18, and a controller 19. The battery connection port 11 is used to connect a battery.

[0042] The first inverter 12 is connected to the battery connection port 11 and includes an N-phase first bridge arm.

[0043] In this embodiment, the first inverter 12 is a power conversion device directly connected to the battery connection port 11. It includes N-phase first bridge arms and can be used to convert direct current (DC) into three-phase alternating current (AC) required by the motor 13 to drive the motor 13. Each phase of the N-phase first bridge arms includes a pair of switching elements (e.g., power semiconductor devices), where N can be 3, representing the three phases (U, V, W) of the three-phase AC power. These switching elements can be used to control the corresponding bridge arm in the N-phase first bridge arms to be in a closed state (i.e., a conducting state) or an open state, thereby adjusting the circuit connection of the motor control system and controlling the current direction and magnitude of the motor control system.

[0044] The aforementioned battery connection port 11 is the port connecting the motor control system and the battery, used to ensure that the battery can provide power for the motor control system in both drive and charging modes. The battery can be a high-voltage battery.

[0045] The motor 13 includes an N-phase winding, the first end of which is connected to the neutral point of the first bridge arm of the N-phase winding.

[0046] In this embodiment, the motor 13 can be designed with open windings and can be called an open-winding motor, including an N-phase winding. The first end of the N-phase winding is connected to the neutral point of the first bridge arm of the N-phase in the first inverter 12 and is the main component used for outputting power.

[0047] The second inverter 14 includes an N-phase second bridge arm, the neutral point of which is connected to the second end of the N-phase winding respectively.

[0048] In this embodiment, the second inverter 14 is a power conversion device, including N-phase second bridge arms, each of which includes a pair of switching elements. These switching elements can be used to control the corresponding bridge arm in the N-phase second bridge arms to be in a closed or open state, thereby adjusting the circuit connection of the motor control system and controlling the current direction and magnitude of the motor control system.

[0049] In this embodiment, the second inverter 14, the N-phase winding of the motor 13, and the first inverter 12 are connected to form a circuit structure that can be reused in different operating modes. In drive mode, the N-phase winding of the motor 13 converts electrical energy into mechanical energy, enabling a driving function, such as propelling a vehicle forward. In charging mode, the N-phase winding of the motor 13 can function as part of a DC-DC converter to achieve energy conversion.

[0050] The first relay 15 is connected between the same end of the second bridge arm of the N-phase and the AC-to-DC module 17.

[0051] In this embodiment, the first relay 15 can be connected between the same end of the N-phase second bridge arm and the AC-to-DC module 17. The AC-to-DC module 17 can convert AC power from an AC source into DC power, which is then transmitted to the battery via the first relay 15 to charge the battery.

[0052] Optionally, the aforementioned AC-to-DC module 17 includes a pre-amplitude power factor correction (PFC) circuit for the OBC to improve charging efficiency and grid compatibility. The aforementioned AC power supply is an external AC power source.

[0053] The second relay 16 is connected between the same end of the second bridge arm of the N phase and the DC power supply connection port 18.

[0054] In this embodiment, the second relay 16 can be connected between the other end of the second bridge arm of the N-phase power supply and the DC power connection port 18. The DC power connection port 18 can be used to connect a DC power source, thereby providing DC power to directly charge the battery. The DC power source is an external DC power source, such as a DC charging station.

[0055] The controller 19 is connected to the first relay 15, the second relay 16, the N-phase first bridge arm, and the N-phase second bridge arm, and is used to control the first relay 15, the second relay 16, the first inverter 12, and the second inverter 14 so that the motor control system operates in the corresponding working mode, wherein the working mode includes one of the driving mode and the charging mode.

[0056] In this embodiment, the controller 19 serves as the central hub of the motor control system, connected to the first relay 15, the second relay 16, the N-phase first bridge arm, and the N-phase second bridge arm. By controlling the switching states of the first relay 15, the second relay 16, the first inverter 12, and the second inverter 14, the motor control system operates in the corresponding drive mode or charging mode. The switching states include closed and open states. The controller 19 can be a microcontroller unit (MCU) or a microprocessor.

[0057] Optionally, in the aforementioned driving mode, the controller 19 controls the first inverter 12 and the second inverter 14 to drive the motor 13. In charging mode, the controller 19 coordinates the first inverter 12, the N-phase winding of the motor 13, and the second inverter 14 to form a highly efficient DC / DC converter, achieving efficient energy conversion whether charging via AC or DC power. This design allows the motor control system to quickly switch operating modes to adapt to different application scenarios.

[0058] This embodiment integrates a first inverter 12, a second inverter 14, a motor 13, a first relay 15, a second relay 16, and a controller 19 to construct a motor control system capable of multiple operating modes. The neutral point of the first N-phase bridge arm of the first inverter 12 and the neutral point of the second N-phase bridge arm of the second inverter 14 are connected to the corresponding N-phase windings of the motor 13. The first relay 15 is connected between the same end of the second N-phase bridge arm and the AC-to-DC module 17, and the second relay 16 is connected between the same end of the second N-phase bridge arm and the DC power connection port 18. The controller 19 controls the first relay 15, the second relay 16, the first N-phase bridge arm of the first inverter 12, and the second N-phase bridge arm of the second inverter 14, enabling the motor control system to seamlessly switch between drive and charging modes. Based on this, the motor control system can fully utilize the advantages of motor 13 in drive mode, and can also reuse the N-phase windings of the first inverter 12, the second inverter 14, and motor 13 in charging mode, reducing hardware redundancy and avoiding limited reuse of the converter and motor 13, bringing flexibility to the operation of the electric drive system, thereby improving the control efficiency of the motor control system and solving the technical problem of low control efficiency of the motor control system.

[0059] The motor control system described above in this embodiment will be further described below.

[0060] As an optional implementation, a first relay is connected between the first end of the N-phase second bridge arm and the first end of the AC-to-DC module, wherein the first end of the N-phase second bridge arm is connected to the first side DC bus of the second inverter, the second end of the N-phase second bridge arm is connected to the second end of the AC-to-DC module, and the second end of the N-phase second bridge arm is connected to the second side DC bus of the second inverter; a second relay is connected between the first end of the N-phase second bridge arm and the positive port of the DC power connection port, wherein the negative port of the DC power connection port is connected to the second side DC bus of the second inverter.

[0061] In this embodiment, the first relay is connected between the first end of the N-phase second bridge arm and the first end of the AC-to-DC module (e.g., the OBC pre-stage PFC). The first end of the N-phase second bridge arm can refer to the end connected to the first-side DC bus of the second inverter, or it can be the end where the upper bridge arm of the N-phase second bridge arm connects to the first-side DC bus of the second inverter, i.e., the input terminal of the second inverter. The first-side DC bus corresponds to the positive terminal of the battery. The first end of the AC-to-DC module can refer to the end where AC power is converted to DC power output. The first relay can be represented by S1, and there is no limitation here.

[0062] The second end of the aforementioned N-phase second bridge arm is connected to the second end of the AC-to-DC module. Specifically, the second end of the N-phase second bridge arm is connected to the second-side DC bus of the second inverter. This second-side DC bus corresponds to the negative terminal of the battery.

[0063] In this embodiment, the second relay is connected between the first end of the second bridge arm of the N-phase system and the positive port of the DC power supply connection port. The positive port can be connected to the positive terminal of the high-voltage system. The DC power supply connection port is a DC power supply connection port, including a negative port, which can be connected to the second-side DC bus of the second inverter. The negative port can be connected to the ground wire or reference point in the high-voltage system. The second relay can be represented by S1, and no limitation is made here.

[0064] In this embodiment, the DC power supply is connected to the input terminal of the second inverter, i.e., the first end of the second arm of the N-phase bridge, through the positive port and the second relay S2, while the negative port is directly connected to the second-side DC bus of the second inverter, thus forming a charging current loop. Based on this, energy can be directly input to the battery from the DC power supply without going through the AC-to-DC conversion process of the OBC, resulting in higher charging efficiency.

[0065] In this embodiment, by flexibly configuring the first and second relays, the functions of drive mode or charging mode can be realized without additional hardware. Furthermore, the first and second relays can be used to isolate the DC or AC power supply from the motor control system, increasing the safety and reliability of the motor control system, preventing unnecessary energy flow, and reducing potential risks.

[0066] For example, Figure 1B This is a schematic diagram of the topology of a motor control system according to an embodiment of this application. For example... Figure 1B As shown, the motor control system may include: a high-voltage battery, inverter 1 (corresponding to the first inverter mentioned above), inverter 2 (corresponding to the second inverter mentioned above), drive circuit, MCU (corresponding to the controller mentioned above), capacitor C1, capacitor C2, open-winding motor (corresponding to the motor mentioned above), current sensor, voltage sensor V1, relay S1 (corresponding to the first relay mentioned above), relay S2 (corresponding to the second relay mentioned above), OBC pre-stage PFC, AC power supply (e.g., AC power supply) and DC power supply.

[0067] High-voltage batteries (such as high-voltage battery packs) can be used to provide power to open-winding motors in drive mode.

[0068] Inverter 1 can be used as a motor drive inverter in drive mode and as a DC / DC bridge arm in charging mode.

[0069] Inverter 2 can be used as a motor drive inverter in drive mode.

[0070] The driving circuit can be used to amplify control signals and drive power switches.

[0071] The MCU can be used to control the switches of each bridge arm in drive mode, thereby realizing the output of the open-winding motor and controlling the bus voltage of inverter 2; in AC charging mode, it can be used to control the bridge arms of inverter 1 and inverter 2 to achieve DC / DC conversion.

[0072] The capacitors may include capacitor C1 connected to both sides of the high-voltage battery and capacitor C2 connected to the bus of inverter 2.

[0073] An open-winding motor can be used to drive a vehicle in drive mode, and in charging mode, the windings act as inductors in a DC / DC circuit.

[0074] Current sensors can be used to monitor three-phase current in drive mode and calculate stator current phase.

[0075] Voltage sensor V1 can be used to monitor the bus voltage of inverter 1, and voltage sensor V2 can be used to monitor the bus voltage of inverter 2.

[0076] Relay S1 and relay S2, wherein relay S1 can be used to connect the OBC front-end PFC and one side bus of inverter 2; relay S2 can be used to connect the DC power supply and the other side bus of inverter 2.

[0077] The OBC preamplifier PFC is connected to the bus of inverter 2 and can be used to convert AC power to DC power.

[0078] AC / DC power supply can be used to charge batteries.

[0079] It should be noted that the above-described motor control system topology is merely an example of this application and does not represent that the motor control system in this application embodiment is limited to the above-described topology. Any topology that can be used to fully utilize the advantages of the motor in drive mode and can also reuse the first inverter, the second inverter, and the N-phase winding of the motor in charging mode is within the scope of this application embodiment, and will not be described in detail here.

[0080] The following describes the drive modes corresponding to the operation of the motor control system in this embodiment.

[0081] As an optional implementation, the motor control system further includes: a first capacitor connected in parallel with the second inverter; a controller for responding to a control signal corresponding to the drive mode, controlling the first relay, the second relay, the first inverter, and the second inverter to make the motor control system operate in the corresponding drive mode, wherein, in the N-phase first bridge arm, at least one phase upper bridge arm is in the same state as the remaining phase lower bridge arms, and in the N-phase second bridge arm, one phase upper bridge arm is in the same state as the remaining phase lower bridge arms, to charge the first capacitor; or, in the N-phase first bridge arm, one phase upper bridge arm is in the same state as the remaining phase lower bridge arms, and in the N-phase second bridge arm, one phase upper bridge arm is in the same state as the remaining phase lower bridge arms, to discharge the first capacitor and the battery; both the first relay and the second relay are in the open state.

[0082] In this embodiment, the motor control system further includes a first capacitor (corresponding to the above). Figure 1B The first capacitor (C2) is connected in parallel with the second inverter. The first and second inverters can be controlled to charge the first capacitor or discharge both the first capacitor and the battery while driving the motor.

[0083] In this embodiment, the controller is used to control both the first and second relays to be in an off state in response to the control signal corresponding to the drive mode. This control result ensures that neither the DC power supply nor the AC power supply is connected to the motor control system, isolating the connection between the motor control system and external power sources (such as the aforementioned DC and AC power supplies), and ensuring that in the drive mode, energy circulates only within the motor control system and is not affected by external power sources.

[0084] The controller described above is used to respond to the control signal corresponding to the drive mode, and also to the state of the first inverter and the state of the second inverter, so as to form a hybrid power supply open winding motor drive circuit, thereby enabling the motor control system to operate in the corresponding drive mode.

[0085] Optionally, the controller is used to control the state of at least one upper phase arm of the N-phase first bridge arm of the first inverter to be the same as the state of the remaining lower phase arms. For example, the controller is used to control the switching element of at least one upper phase arm of the N-phase first bridge arm of the first inverter to perform a closing operation, and the switching elements of the remaining lower phase arms to also perform a closing operation, so that the state of at least one upper phase arm of the N-phase first bridge arm of the first inverter is closed, and the state of the remaining lower phase arms is also closed.

[0086] Additionally, the controller is used to control the state of one upper bridge arm in the N-phase second bridge arm of the second inverter to be the same as the state of the remaining lower bridge arms, so as to charge the first capacitor. For example, the controller is used to control the switching element of one upper bridge arm in the N-phase second bridge arm of the second inverter to perform a closing operation, and the switching elements of the remaining lower bridge arms also perform a closing operation, so that the state of one upper bridge arm in the N-phase second bridge arm of the second inverter is closed, and the state of the remaining lower bridge arms is also closed.

[0087] It should be noted that, regarding the charging of the first capacitor, the phase of the upper bridge arm in the second inverter that is in a closed state is the same as the phase of the upper bridge arm in the first inverter that is in a closed state.

[0088] By controlling the first N-phase bridge arm of the first inverter and the second N-phase bridge arm of the second inverter, the drive motor is realized, and a path for energy transfer from the battery to the first capacitor is formed, thereby achieving the purpose of charging the first capacitor, which provides a buffer source for subsequent energy conversion.

[0089] Optionally, the controller is used to control the state of one upper bridge arm in the N-phase first bridge arm of the first inverter to be the same as the state of the other lower bridge arms. For example, the controller is used to control the switching element of one upper bridge arm in the N-phase first bridge arm of the first inverter to perform a closing operation, and the switching elements of the other lower bridge arms to also perform a closing operation, so that the state of one upper bridge arm in the N-phase first bridge arm of the first inverter is closed, and the state of the other lower bridge arms is also closed.

[0090] In addition, the controller is used to control the state of one upper bridge arm in the N-phase second bridge arm of the second inverter, so that it is the same as the state of the other lower bridge arms. For example, the controller is used to control the switching element of one upper bridge arm in the N-phase second bridge arm of the second inverter to perform a closing operation, and the switching elements of the other lower bridge arms also perform a closing operation. This makes the state of one upper bridge arm in the N-phase second bridge arm of the second inverter closed, and the state of the other lower bridge arms also closed.

[0091] It should be noted that, in relation to the discharge of the first capacitor and the simultaneous discharge of the battery, the phase of the upper bridge arm in the second inverter that is in a closed state is different from the phase of the upper bridge arm in the first inverter that is in a closed state.

[0092] The controller controls the first N-phase bridge arm of the first inverter and the second N-phase bridge arm of the second inverter. While driving the motor, the first capacitor is discharged and the battery is discharged at the same time. This allows the first capacitor and the battery to output energy to the motor through the N-phase group of the motor and the first and second inverters, thus achieving the purpose of transferring energy from the first capacitor and the battery to the motor to drive the vehicle.

[0093] In this embodiment, the first capacitor acts as an energy buffer in drive mode. By controlling the charging or discharging of the first capacitor, the generation of zero-sequence current can be effectively suppressed, avoiding a decrease in voltage utilization and further optimizing the drive performance of the motor control system. The first capacitor works in conjunction with the controller, and provides precise control over the N-phase first bridge arm of the first inverter and the N-phase second bridge arm of the second inverter, achieving efficient energy management and distribution in drive mode. This design not only improves the overall stability and efficiency of the motor control system but also optimizes the motor's drive performance by suppressing zero-sequence current.

[0094] The process of charging the first capacitor in drive mode by the motor control system described above in this embodiment will be further explained below.

[0095] As an optional implementation, for charging the first capacitor, in the N-phase first bridge arm, at least one phase upper bridge arm is in a closed state, the remaining phase lower bridge arms are in a closed state, and the other bridge arms in the N-phase first bridge arm are all in an open state; in the N-phase second bridge arm, at least one phase upper bridge arm is in a closed state, the remaining phase lower bridge arms are in a closed state, and the other bridge arms in the N-phase second bridge arm are all in an open state.

[0096] In this embodiment, the states of the first N-phase bridge arm in the first inverter and the second N-phase bridge arm in the second inverter are important parts of realizing the charging of the first capacitor.

[0097] Regarding the state of the first bridge arm of the N-phase, the controller controls at least one phase's upper bridge arm (e.g., the upper bridge arm of phase U) to be in a closed state, and at the same time, at least one phase's lower bridge arm (e.g., the lower bridge arm of phase V and the lower bridge arm of phase W) is also in a closed state, while the other bridge arms in the first bridge arm of the N-phase (the bridge arms other than the upper bridge arm of phase U, the lower bridge arm of phase V, and the lower bridge arm of phase W) are all in an open state.

[0098] In addition, the controller controls at least one phase's upper bridge arm (e.g., the upper bridge arm of phase U) in the second bridge arm of phase N to be in a closed state, and the lower bridge arms of the remaining phases (e.g., the lower bridge arms of phase V and phase W) to be in a closed state, while the other bridge arms in the second bridge arm of phase N (the bridge arms other than the upper bridge arm of phase U, the lower bridge arm of phase V, and the lower bridge arm of phase W) are in an open state.

[0099] It should be noted that, regarding the charging of the first capacitor, the phase of the upper bridge arm in the second inverter that is in a closed state is the same as the phase of the upper bridge arm in the first inverter that is in a closed state. This configuration also forms a closed circuit, ensuring that the first capacitor can be charged in drive mode.

[0100] In the N-phase first and second bridge arms, the upper and lower bridge arms of specific phases are in a closed state. The phase containing the closed upper bridge arm in the second inverter is different from the phase containing the closed upper bridge arm in the first inverter, while the other bridge arms are in an open state. Based on this, the current will form a closed loop through the closed bridge arm, the motor windings (also called motor windings), and the first capacitor. This path allows the current to flow from the positive terminal of the battery through the closed upper bridge arm to the motor windings, then through the first capacitor, and finally back to the negative terminal of the battery, thereby achieving the purpose of charging the first capacitor. In the above charging path, the first capacitor, as an energy storage element in the circuit, can absorb electrical energy and establish a voltage across its terminals. As the charging process proceeds, the energy stored in the first capacitor gradually increases until a predetermined charging level is reached.

[0101] This embodiment effectively reduces energy loss and improves charging efficiency by controlling the states of the first and second inverters, closing the upper and lower arms of certain phases only when necessary. Furthermore, selectively closing the upper or lower arms of certain phases effectively suppresses zero-sequence current generation, improves voltage utilization, optimizes motor operating conditions, and enhances the overall performance and economy of the motor control system.

[0102] The following describes the process of charging the first capacitor in the drive mode of the motor control system described in this embodiment. In particular, for the charging of the first capacitor, the phase in which the upper bridge arm in the second inverter is in a closed state is the same as the phase in which the upper bridge arm in the first inverter is in a closed state. An example is given below.

[0103] Figure 2A This is a schematic diagram of capacitor charging in a driving mode according to an embodiment of the present invention. Figure 2A As shown, in Figure 1B Based on this, control relays S1 and S2 are disconnected, and the motor control system operates in drive mode. At this time, a hybrid power supply open-winding motor drive circuit is formed. The motor can be driven by controlling the voltage vector of inverter 1 (corresponding to the first inverter mentioned above) and the voltage vector of inverter 2 (corresponding to the second inverter mentioned above), while simultaneously controlling capacitor C2 (corresponding to the first capacitor mentioned above).

[0104] Optionally, the controller controls the upper U-phase bridge arm of inverter 1 to be closed, the lower V-phase bridge arm to be closed, and the lower W-phase bridge arm to be closed, resulting in a control vector of 100; it also controls the upper U-phase bridge arm of inverter 2 (which is the same as the upper U-phase bridge arm of inverter 1) to be closed, the lower V-phase bridge arm to be closed, and the lower W-phase bridge arm to be closed, resulting in a control vector of 100. Thus, while driving the motor, the power supply can charge C2.

[0105] Figure 2B This is a schematic diagram of capacitor charging in another driving mode according to an embodiment of the present invention. Figure 2B As shown, in Figure 1B Based on this, the controller controls the upper U-phase arm of inverter 1 to be closed, controls the upper V-phase arm of inverter 1 to be closed, controls the lower W-phase arm of inverter 1 to be closed, and all other arms are in the open state.

[0106] In addition, the upper U-phase bridge arm of inverter 2 is in a closed state (the same upper U-phase bridge arm of inverter 1), the upper V-phase bridge arm of inverter 2 is in a closed state (the same upper V-phase bridge arm of inverter 1), the lower W-phase bridge arm of inverter 2 is in a closed state, and the other bridge arms are in an open state, forming a capacitor charging circuit, thereby achieving the purpose of charging C2 while driving the motor.

[0107] It should be noted that the capacitor charging method of the motor control system in drive mode described above is merely an example of this application and does not mean that the capacitor charging method in drive mode of this application is limited to the circuit control method described above. Any method that can be used to realize the charging of the first capacitor in drive mode is within the scope of this embodiment, and will not be described in detail here.

[0108] The process of discharging the first capacitor and battery in drive mode as described above in the motor control system of this embodiment will be further explained below.

[0109] As an optional implementation, for discharging the first capacitor and the battery, in the N-phase first bridge arm, one phase upper bridge arm is in a closed state, the remaining phase lower bridge arms are in a closed state, and the other bridge arms in the N-phase first bridge arm are all in an open state; in the N-phase second bridge arm, one phase upper bridge arm is in a closed state, the remaining phase lower bridge arms are in a closed state, and the other bridge arms in the N-phase second bridge arm are all in an open state.

[0110] In this embodiment, the controller controls one phase upper arm of the first N-phase bridge arm of the first inverter to be in a closed state (e.g., the U-phase upper arm), while the lower arms of the other phases are in a closed state (e.g., the V-phase lower arm and the W-phase lower arm). At the same time, the other arms of the first N-phase bridge arm (except for the aforementioned U-phase upper arm, V-phase lower arm, and W-phase lower arm) are all in an open state.

[0111] In addition, the controller controls one phase upper arm (e.g., the V phase upper arm) of the N-phase second bridge arm of the second inverter to be in a closed state, while the other phase lower arms (e.g., the U phase lower arm and the W phase lower arm) are in a closed state. The remaining phase lower arms (arms other than the aforementioned V phase upper arm, U phase lower arm, and W phase lower arm) are all in an open state to ensure the orderly operation of the circuit.

[0112] It should be noted that, in relation to the discharge of the first capacitor and the simultaneous discharge of the battery, the phase of the upper bridge arm in the second inverter that is in a closed state is different from the phase of the upper bridge arm in the first inverter that is in a closed state.

[0113] In both the first inverter's bridge arm state and the second inverter's bridge arm state, the first capacitor is connected in series in the circuit. This means that its stored energy can also be released into the motor and used in conjunction with the battery's energy to drive the motor. In other words, the first capacitor discharges in parallel with the battery, increasing the system's available energy and improving drive efficiency.

[0114] In this embodiment, during the discharge process of the first capacitor and battery, the energy of the first capacitor and battery is released in a timely manner as needed by controlling the first arm of the N-phase bridge in the first inverter and the second arm of the N-phase bridge in the second inverter. This fully utilizes the energy of the first capacitor and battery, improving the overall energy utilization rate of the motor control system and ensuring that the motor receives sufficient energy for efficient driving. Furthermore, this embodiment effectively avoids the generation of zero-sequence current by selectively closing the upper or lower arms of certain phases of the first and second inverters.

[0115] The following describes the process of discharging the first capacitor and battery in the drive mode of the motor control system described in this embodiment. In particular, the phase in which the upper bridge arm in the second inverter is in a closed state is different from the phase in which the upper bridge arm in the first inverter is in a closed state when the first capacitor and battery are discharging. An example is given to illustrate this process.

[0116] Figure 3 This is a schematic diagram of the first capacitor and battery discharging under a driving mode according to an embodiment of the present invention. Figure 3 As shown, in Figure 1B Based on this, the controller controls the upper U-phase arm of inverter 1 to be closed, the lower V-phase arm to be closed, the lower W-phase arm to be closed, and all other arms to be open.

[0117] In addition, the upper V-phase arm of inverter 2 (which is different from the upper U-phase arm of inverter 1) is in a closed state, the lower U-phase arm is in a closed state, the lower W-phase arm is in a closed state, and all other arms are in an open state.

[0118] By controlling inverter 1 and inverter 2 as described above, a circuit for discharging the first capacitor and the battery is formed, thereby achieving the purpose of discharging the first capacitor and the battery while driving the motor.

[0119] It should be noted that the above-described method for discharging the first capacitor and battery in drive mode of the motor control system is merely an example of this application and does not imply that the method for discharging the first capacitor and battery in drive mode of this application is limited to the circuit control method described above. Any method that can be used to achieve the discharge of the first capacitor and battery in drive mode is within the scope of this embodiment, and will not be described in detail here.

[0120] The charging modes corresponding to the operation of the motor control system in this embodiment will be described below.

[0121] As an optional implementation, the controller is used to control the first relay, the second relay, the first inverter, and the second inverter in response to the control signal corresponding to the charging mode, so that the motor control system operates in the corresponding charging mode. In the N-phase first bridge arm, the state of one phase upper bridge arm is the same as the state of the other phase lower bridge arm; in the N-phase second bridge arm, the state of one phase upper bridge arm is the same as the state of the other phase lower bridge arms; one of the first relay and the second relay is in a closed state, and the other relay is in an open state.

[0122] In this embodiment, the controller, in response to a control signal corresponding to the charging mode, can control one of the first and second relays to be in a closed state and the other relay to be in an open state. This control result is crucial for switching from the drive mode to the charging mode; the closed first or second relay will connect or disconnect the circuit to adapt to the needs of the charging process.

[0123] Optionally, if the battery needs to be charged via AC power (e.g., a household outlet), the controller will close the first relay and open the second relay. In this way, the AC power will be converted to DC power by the pre-amplifier (PFC) of the OBC. This DC current flows through the closed first relay, then through the DC / DC circuit consisting of the N-phase second bridge arm, the motor windings, and the N-phase first bridge arm, ultimately charging the battery.

[0124] Optionally, if the battery needs to be charged via a DC power source (e.g., a fast-charging station), the controller will close the second relay and open the first relay. In this way, DC power will flow directly through the closed second relay, through the N-phase second bridge arm of the second inverter, and ultimately charge the battery via the motor windings and the N-phase first bridge arm of the first inverter.

[0125] The controller responds to the control signal corresponding to the charging mode and also controls the first and second inverters to enable the motor control system to operate in the corresponding charging mode. The controller controls the state of one upper phase of the N-phase first bridge arm, ensuring it is in the same state as the remaining lower phases. For example, the controller controls the switching element of one upper phase of the N-phase first bridge arm to perform a closing operation, and the switching elements of the remaining lower phases also perform closing operations, so that the state of one upper phase of the N-phase first bridge arm is closed, and the state of the remaining lower phases is also closed.

[0126] In addition, the controller is used to control the state of one phase upper arm of the N-phase second bridge arm, which is the same as the state of the other phase lower arms. For example, the controller is used to control the switching element of one phase upper arm of the N-phase second bridge arm to perform a closing operation, and the switching elements of the other phase lower arms also perform a closing operation, so that the state of one phase upper arm of the N-phase second bridge arm is closed, and the state of the other phase lower arms is also closed.

[0127] In this embodiment, the controller provides compatibility with different types of power supplies (AC and DC) by controlling one of the first and second relays to be closed and the other to be open, enabling the motor control system to operate in various charging scenarios. Furthermore, the controller system controls the state of one phase upper arm of the N-phase second bridge arm of the first inverter to be the same as the state of the remaining phase lower arms, and controls the state of one phase upper arm of the N-phase second bridge arm of the second inverter to be the same as the state of the remaining phase lower arms, thereby activating the charging mode of the motor control system. This method ensures that current can flow between the motor windings, the bridge arms of the first and second inverters, and the battery, thereby achieving efficient energy conversion and ensuring that the motor control system can operate efficiently and safely in charging mode.

[0128] The charging mode of this embodiment includes AC charging mode. The AC charging mode corresponding to the operation of the motor control system of this embodiment is described below.

[0129] As an optional implementation, for an AC charging mode, in the N-phase first bridge arm, one upper bridge arm is closed, the remaining lower bridge arm is closed, and the other bridge arms in the N-phase first bridge arm are open; in the N-phase second bridge arm, one upper bridge arm is closed, the remaining lower bridge arm is closed, and the other bridge arms in the N-phase second bridge arm are open; in the AC-to-DC module, one upper bridge arm is closed to connect to the positive terminal of the AC power supply, the remaining lower bridge arm is closed to connect to the negative terminal of the AC power supply, and the other bridge arms in the AC-to-DC module are open, with the AC power supply connected to the AC-to-DC module; the first relay is closed, and the second relay is open.

[0130] In this embodiment, for AC charging mode, the controller controls the first relay to be in the closed state and the second relay to be in the open state, allowing AC power to be connected to the motor control system, forming a connection path from AC power to the AC-to-DC module. The controller controls the second relay to be in the open state to prevent DC power from being connected, thereby ensuring charging safety in AC charging mode.

[0131] The controller described above is used to control one phase upper bridge arm (e.g., the U phase upper bridge arm) in the first bridge arm of N phases to be in a closed state, and to control the other phase lower bridge arm (e.g., the W phase lower bridge arm) to also be in a closed state, while the other bridge arms in the first bridge arm of N phases (the bridge arms other than the U phase upper bridge arm and the W phase lower bridge arm) are all in an open state.

[0132] In addition, the controller is used to control the upper arm of one phase of the second bridge arm of the N phase (e.g., the upper arm of phase U) to be in a closed state, the lower arm of the other phase (e.g., the lower arm of phase W) to be in a closed state, and the other arms of the second bridge arm of the N phase (arms other than the upper arm of phase U and the lower arm of phase W) to be in an open state.

[0133] The aforementioned AC-to-DC module can be an OBC pre-stage PFC circuit, a core component for AC charging. In this AC-to-DC module, one phase upper arm is closed to connect to the positive terminal of the AC power supply, and the other phase lower arm is closed to connect to the negative terminal of the AC power supply. All other arms in the AC-to-DC module are open.

[0134] Based on the above, the AC power from the AC power supply reaches the AC-to-DC module, which converts the AC power into DC power. The converted DC power then passes through a first relay in a closed state, a specific upper arm of the N-phase second bridge arm in a closed state, the motor windings, a specific upper arm of the N-phase first bridge arm, and finally reaches the battery. This achieves a highly efficient charging process from AC power to DC power and then from DC power to the battery, enabling the motor control system to operate in AC charging mode.

[0135] The following example illustrates the AC charging mode in which the motor control system of this embodiment operates.

[0136] Figure 4 This is a schematic diagram of a motor control system in AC charging mode according to an embodiment of this application. Figure 4 As shown, in Figure 1B Based on this, the controller controls the AC power supply (e.g., AC power). After passing through the pre-stage PFC in the OBC, the AC power flows through the DC / DC circuit composed of inverter 1, motor windings and inverter 2 to charge the high-voltage battery.

[0137] For example, taking the U-phase and W-phase windings of a motor as an example, the U-phase and W-phase windings, along with the bridge arms of inverter 1 and inverter 2, are used as a DC / DC converter. Specifically, the upper U-phase bridge arm and the lower W-phase bridge arm of inverter 1 are closed, while the other bridge arms are open. Similarly, the upper U-phase bridge arm and the lower W-phase bridge arm of inverter 2 are closed, while the other bridge arms are open, so that the motor control system operates in AC charging mode.

[0138] It should be noted that the battery charging method of the motor control system in AC charging mode described above is merely an example of this application and does not mean that the battery charging method in AC charging mode in this application embodiment is limited to the circuit control method described above. Any method that can be used to implement battery charging in AC charging mode is within the scope of this embodiment, and will not be described in detail here.

[0139] The charging mode of this embodiment includes a DC charging mode. The DC charging mode corresponding to the operation of the motor control system of this embodiment is described below.

[0140] As an optional implementation, for a DC charging mode, in the first N-phase bridge arm, one upper bridge arm is in a closed state, the other lower bridge arm is in a closed state, and the other bridge arms in the first N-phase bridge arm are all in an open state; in the second N-phase bridge arm, one upper bridge arm is in a closed state, the other lower bridge arm is in a closed state, and the other bridge arms in the second N-phase bridge arm are all in an open state; the first relay is in an open state, and the second relay is in a closed state.

[0141] In this embodiment, for DC charging mode, the vehicle can use DC current from a DC power source (e.g., a fast charging station) to charge the battery. This charging method is generally faster than AC charging and is suitable for scenarios where a large amount of electrical energy needs to be replenished in a short time.

[0142] In this embodiment, to prevent AC power from affecting the circuit, the controller keeps the first relay in the open state, meaning the connection between the AC power and the OBC pre-stage PFC circuit is interrupted. In contrast, the controller keeps the second relay in the closed state, thus creating a direct connection from the DC power supply to the N-phase second bridge arm, providing a current path for battery charging and ensuring that the charging process is driven solely by the DC power supply.

[0143] In DC charging mode, the controller controls one phase upper arm (e.g., U phase upper arm) of the first N-phase bridge arm to be closed, and the other phase lower arm (e.g., W phase lower arm) to be closed. All other arms of the first N-phase bridge arm (except for the V phase lower arm and W phase lower arm mentioned above) are in the open state.

[0144] In addition, the controller is used to control one phase upper bridge arm (e.g., the U phase upper bridge arm) in the N-phase second bridge arm to be in the closed state, the other phase lower bridge arm (e.g., the W phase upper bridge arm) to be in the closed state, and the other bridge arms in the N-phase second bridge arm (except for the U phase upper bridge arm and the W phase upper bridge arm mentioned above) to be in the open state.

[0145] Based on the above, a path for DC current to be transmitted from the second inverter, the motor windings, the first inverter, and the battery was constructed. The motor windings, the first inverter, and the second inverter together constitute a buck-boost circuit to adjust the DC power supply voltage to meet the battery's charging requirements.

[0146] In this embodiment, the DC power supply can be directly connected to the second arm of the N-phase bridge via a closed second relay, providing direct DC power input for the charging process. With the coordinated operation of the first arm of the N-phase bridge of the first inverter and the second arm of the N-phase bridge of the second inverter, a charging path from the DC power supply to the battery is established, completing the fast charging process. Throughout the charging process, the controller ensures efficient energy transfer and management by finely adjusting the states of the first and second arms of the N-phase bridge, while avoiding unnecessary energy loss and circuit overload risks.

[0147] The following example illustrates the DC charging mode corresponding to the operation of the motor control system in this embodiment.

[0148] Figure 5This is a schematic diagram of a motor control system in DC charging mode according to an embodiment of this application. Figure 5 As shown, in Figure 1B Based on this, the controller is used to control relay S1 to open and relay S2 to close, so that the motor control system operates in DC charging mode.

[0149] Taking the U-phase winding and W-phase winding as an example, inverter 1, the winding and inverter 2 form a Buck-Boost circuit. By controlling the bridge arm switches of inverter 1 and inverter 2, the high-voltage battery can be charged by stepping down / boosting.

[0150] Optionally, in inverter 1, the upper U-phase arm is closed, the lower W-phase arm is closed, and all other arms are open. In inverter 2, the upper U-phase arm is closed, the lower W-phase arm is closed, and all other arms are open, so that the motor control system operates in DC charging mode.

[0151] It should be noted that the battery charging method of the motor control system in DC charging mode described above is merely an example of this application and does not mean that the battery charging method in DC charging mode in this application is limited to the circuit control method described above. Any method that can be used to implement battery charging in DC charging mode is within the scope of this embodiment, and will not be described in detail here.

[0152] As an optional implementation, the motor control system further includes a second capacitor connected in parallel with the first inverter.

[0153] In this embodiment, the motor control system includes a second capacitor in addition to the first capacitor. This second capacitor is connected in parallel with the first inverter, meaning that the second capacitor and the first inverter share the same voltage node; that is, the voltages across the second capacitor and the first inverter are the same.

[0154] Under target operating conditions, such as when the motor suddenly accelerates or decelerates, the motor control system will experience instantaneous fluctuations in energy demand. A second capacitor can be used to temporarily store and release this energy. Through the energy storage characteristics of the second capacitor, the instantaneous changes in energy demand are buffered, thereby preventing excessive impact on the high-voltage battery or power supply.

[0155] Furthermore, in motor control systems, zero-sequence current is an undesirable current component that can be generated in the motor windings, affecting the motor's efficiency and performance. Connecting the second capacitor in parallel with the first inverter can effectively suppress this zero-sequence current, improve voltage utilization, and optimize the motor's operating conditions.

[0156] Furthermore, the second capacitor can provide additional current support when the output of the first inverter is unstable, thereby improving the dynamic response performance of the entire motor control system.

[0157] When the motor control system is operating in drive mode, the second capacitor works in conjunction with the first inverter to smooth the AC output of the first inverter, ensuring the smoothness and efficiency of motor drive.

[0158] When the motor control system is operating in charging mode, the second capacitor acts as a buffer during the energy conversion process. Especially during the DC / DC conversion stage, it can effectively stabilize the voltage of the inverter bus and optimize the energy transfer efficiency of the charging process.

[0159] According to an embodiment of this application, an embodiment of a control method for a motor control system is also provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0160] This application provides a control method for a motor control system. This method can be used to provide motor control functions for preset application scenarios. These preset application scenarios may include the following scenarios in the vehicle field: autonomous driving for commuting, AI-powered driver assistance for family cars, automatic parking assistance (APA) scenarios (such as memory parking for self-owned parking spaces in garages, intelligent parking for designated parking spaces in parking lots, etc.), and navigation-guided pilot (NGP) scenarios in urban or highway areas. Furthermore, these preset application scenarios may also include, but are not limited to: motor control scenarios for intelligent driving trucks or unmanned trucks in the logistics and transportation field, motor control scenarios for autonomous agricultural vehicles in the agricultural machinery field, motor control scenarios for drones, and motor control scenarios for intelligent robots (such as cleaning robots, service robots, delivery robots, etc.).

[0161] The control method of the motor control system in this embodiment can be applied to the motor control system of the embodiments of this application. Figure 6 This is a flowchart of a control method for a motor control system according to an embodiment of the present invention. The method may include the following steps.

[0162] Step S601: In response to the control signal corresponding to the working mode of the motor control system, control the first relay, the second relay, the first inverter, and the second inverter to make the motor control system operate in the corresponding working mode.

[0163] The operating mode described in this embodiment includes one of a driving mode and a charging mode. The charging mode includes an AC charging mode and a DC charging mode.

[0164] As an alternative example, the motor control system is used to drive the motor in drive mode, to perform AC charging of the battery through the motor windings in AC charging mode, and to perform DC charging of the battery through the motor windings in DC charging mode.

[0165] In this embodiment, a mode selection command can be triggered by controlling the switch of the motor control system. This mode selection command can be used to instruct the motor control system to enter a specific operating mode. Optionally, this embodiment also triggers the mode selection command based on vehicle status (e.g., parked, driving), charging needs (e.g., fast charging at a charging station), and driver operation (e.g., selecting an operating mode on the instrument panel). The vehicle may include, but is not limited to, a gasoline-powered vehicle.

[0166] In response to the above mode selection command for the motor control system, the target operating mode is selected from multiple operating modes of the motor control system.

[0167] The motor control system is used to drive the motor in the aforementioned drive modes. Optionally, during vehicle operation, the motor control system supplies power from the battery to the motor via the first inverter. That is, under the drive conditions corresponding to the drive mode, the battery can provide power to the motor to drive it and thus propel the vehicle forward.

[0168] The motor control system is used to perform AC charging of the battery through the motor windings in the aforementioned AC charging mode. Optionally, when AC charging of the battery is required via an AC power source (e.g., AC power), the motor windings can be used as part of a DC / DC converter to convert AC power to DC power, thereby charging the battery (e.g., a high-voltage battery). The motor windings can be used as inductors to participate in the voltage regulation process during AC charging.

[0169] The motor control system is used to perform DC charging of the battery through the motor windings in the aforementioned DC charging mode. Optionally, when it is necessary to perform DC charging of the battery through a DC power supply, the motor control system can use the motor windings as inductors and control the first and second inverters to achieve buck or boost charging of the battery in DC charging mode to adapt to DC charging sources of different voltages.

[0170] In response to a mode selection command for the motor control system, after selecting the target operating mode from multiple operating modes of the motor control system, the control strategy under the target operating mode can be determined. The control strategy is used to represent the rules for controlling the first relay, the second relay, the first inverter, and the second inverter, respectively.

[0171] In this embodiment, in order to ensure that the motor control system can switch between different operating modes efficiently and safely, such as switching between drive mode, AC charging mode and DC charging mode, it is necessary to control the first relay, the second relay, the first inverter and the second inverter to form the circuit of the motor control system in different operating modes.

[0172] In this embodiment, the first relay can be connected to the PFC circuit of the OBC and the bus of the second inverter, and the second relay can be connected to the DC power supply and the bus of the second inverter. By controlling the states of the first and second relays (e.g., closed or open), the motor control system can switch between different operating modes. Optionally, for the OBC, this embodiment can use different forms of OBC rectifier circuits, such as using a passive full-wave bridge rectifier instead of a synchronous rectifier; no specific limitation is made here.

[0173] The first inverter described above can be used as a motor drive inverter in drive mode, and as a DC / DC bridge arm in AC charging mode and DC charging mode; the second inverter described above can be used as a motor drive inverter in drive mode.

[0174] The control strategy described above in this embodiment is a set of rules used to instruct how the first relay, the second relay, the first inverter, and the second inverter should operate. The control methods for the first relay, the second relay, the first inverter, and the second inverter will differ under different operating modes to meet the specific functional requirements of each operating mode.

[0175] For example, in drive mode, the control strategy ensures that both the first and second relays are in the open state, allowing the battery to drive the motor through the first inverter and participate in charging and discharging through the first capacitor to avoid the generation of zero-sequence current. In AC charging mode, the control strategy closes the first relay and opens the second relay, allowing AC power to flow through the pre-stage PFC of the OBC and then through the DC / DC circuit composed of the first inverter, motor windings, and the second inverter to charge the battery. In DC charging mode, the control strategy opens the first relay and closes the second relay, enabling buck-boost charging of the battery from the DC power supply through the buck-boost circuit composed of the first inverter, motor windings, and the second inverter.

[0176] Optionally, the control strategy of this embodiment can be implemented by the controller sending control signals to the first relay, the second relay, the first inverter, and the second inverter to precisely adjust the operating states of each of the first relay, the second relay, the first inverter, and the second inverter. The controller can be used to control the state of each bridge arm in the first and second inverters in drive mode, and can also be used to control the bus voltage of the second inverter. In AC charging mode, it can also control the bridge arms of the second inverter to achieve DC / DC conversion. Optionally, the motor control system further includes a drive circuit, which can amplify the control signals to drive the power switch.

[0177] After determining the control strategy for the first relay, the second relay, the first inverter, and the second inverter in the target operating mode, control operations can be performed on the first relay, the second relay, the first inverter, and the second inverter respectively according to the control strategy, so that the motor control system operates in the target operating mode.

[0178] In this embodiment, the controller can be used to monitor various operating parameters of the motor control system, such as battery voltage, motor operating status, and external power supply status. These operating parameters can be used to determine when and how to control the first relay, second relay, first inverter, and second inverter, so that the motor control system operates in the target working mode. This ensures that the motor control system can provide power to the motor while driving and efficiently charge the battery when the vehicle is parked.

[0179] In related technologies, electric drive and control systems typically design the OBC, motor controller, and DC / DC converter separately. Although attempts have been made to integrate these functions into a single housing to reduce size and weight, there are still limitations in circuit and component reuse, especially in the utilization of motor windings. For example, a converter on one side of the motor may be reused as part of the charging circuit, while the converter on the other side or the DC / DC converter in an all-in-one system may not be fully utilized, resulting in low cost and efficiency.

[0180] The second inverter and the battery (e.g., a high-voltage battery) are integrated not only physically but also functionally through software-level control strategies. In this embodiment, the motor has a dual function: in drive mode, it functions as a traditional motor to power the vehicle; in charging mode, the motor windings themselves can serve as inductors in a DC / DC circuit, reducing the need for additional hardware. Furthermore, in each operating mode, this embodiment can control the switching states and operating modes of the first and second inverters in the relay set and converter set according to a preset control strategy, adapting to the control requirements of the current operating mode. This allows for full utilization of the motor's advantages in drive mode, while the reuse of the converter and motor windings in charging mode reduces the use of components and supports multiple charging methods.

[0181] Therefore, in the embodiment provided in step S601 of this application, by controlling the first relay, the second relay, the N-phase first bridge arm of the first inverter, and the N-phase second bridge arm of the second inverter through the controller, the motor control system can seamlessly switch between drive mode and charging mode. Based on this, the motor control system can fully utilize the advantages of the motor in drive mode, and can also reuse the first and second inverters and the N-phase windings of the motor in charging mode, reducing hardware redundancy, avoiding limited reuse of converter and motor windings, bringing flexibility to the operation of the electric drive system, thereby improving the control efficiency of the motor control system, and thus solving the technical problem of low control efficiency of the motor control system.

[0182] The methods described in the above embodiments will be further explained below.

[0183] As an optional implementation, step S601, responding to a control signal corresponding to the operating mode of the motor control system, controls the first relay, the second relay, the first inverter, and the second inverter to make the motor control system operate in the corresponding operating mode, including: responding to a control signal corresponding to the drive mode, controlling the first relay and the second relay to disconnect, and controlling the voltage of the first inverter to a first target voltage and the voltage of the second inverter to a second target voltage to make the motor control system operate in the drive mode; wherein the first target voltage and the second target voltage are used to drive the motor to work, and the battery is used to provide power to the motor in the drive mode.

[0184] In this embodiment, when the target operating mode is drive mode, the first relay can be controlled to disconnect, which means that the AC to DC module is disconnected from the bus of the second inverter, thereby ensuring that the AC power supply will not interfere with the circuit where the running motor is located, and also avoiding the safety factors caused by AC charging of the battery during vehicle operation.

[0185] This embodiment also controls the second relay to disconnect, which means the DC power supply is disconnected from the bus of the second inverter. In this way, in drive mode, the vehicle does not require external DC power. Disconnecting the second relay eliminates unnecessary energy flow, allowing the motor control system to use the battery to power the motor.

[0186] In drive mode, the system can respond to control signals corresponding to the drive mode, controlling the first and second relays to disconnect, and controlling the voltage of the first inverter to a first target voltage and the voltage of the second inverter to a second target voltage, so that the motor control system operates in drive mode. The first inverter can convert the DC power from the battery into a specific form of AC power required by the motor. The first inverter can output the first target voltage, which can be a voltage vector calculated based on real-time parameters such as motor load and vehicle driving status. For example, the first target voltage can be a voltage vector of 100 to optimize the operating efficiency and performance of the open-winding motor.

[0187] The second inverter also participates in the motor drive process. The voltage of the second inverter is controlled to a second target voltage, for example, a voltage vector of 100. This second target voltage not only meets the motor's drive requirements but also ensures a uniform energy supply to the motor, thereby preventing performance degradation.

[0188] Optionally, the controller can calculate the first target voltage and the second target voltage required to drive the open-winding motor based on factors such as the vehicle's real-time operating status, the load of the open-winding motor, and driving requirements, so as to maximize the efficiency and response speed of the open-winding motor while maintaining stable operation of the open-winding motor.

[0189] Optionally, to ensure the voltage of the first inverter reaches the first target voltage, the controller triggers the opening (i.e., the bridge arm is in a closed state) of the bridge arm in the first inverter that matches the first target voltage. For example, in the N-phase first bridge arm of the first inverter, the controller controls the state of at least one phase upper bridge arm to be the same as the state of the remaining phase lower bridge arms. Similarly, for the second inverter, the controller also opens the bridge arm in the second inverter that matches the second target voltage according to the second target voltage to ensure that the output voltage of the second inverter meets the drive requirements of the open-winding motor. For example, in the N-phase second bridge arm of the second inverter, the state of one phase upper bridge arm is the same as the state of the remaining phase lower bridge arms.

[0190] For example, to ensure that the first target voltage of the first inverter is voltage vector 100, the controller can control the upper U-phase bridge arm of the first inverter to be closed, the lower V-phase bridge arm to be closed, the lower W-phase bridge arm to be closed, and the other bridge arms to be open, thus obtaining a control vector of 100; to ensure that the second target voltage of the second inverter is voltage vector 100, the controller can control the upper U-phase bridge arm of the second inverter to be closed, the lower V-phase bridge arm to be closed, the lower W-phase bridge arm to be closed, and the other bridge arms to be open, thus obtaining a control vector of 100.

[0191] In this embodiment, the switching states of the bridge arms inside the first inverter and the second inverter are controlled by control signals from the controller. In drive mode, the controller sends control signals to open the bridge arm in the first inverter that matches the first target voltage, thereby generating the first target voltage required for the open-winding motor, and to open the bridge arm in the second inverter that matches the second target voltage, thereby generating the second target voltage required for the open-winding motor. Precise control of the bridge arms in the first and second inverters by the controller is crucial for both inverters to output stable voltages to drive the open-winding motor.

[0192] As an optional implementation, the charging mode includes an AC charging mode. Step S601 involves responding to a control signal corresponding to the operating mode of the motor control system, controlling the first relay, the second relay, the first inverter, and the second inverter to enable the motor control system to operate in the corresponding operating mode. This includes: responding to the control signal corresponding to the AC charging mode, controlling the first relay to close, controlling the second relay to open, controlling the AC-to-DC module to convert the AC power supplied by the AC power source into a first initial DC power, and controlling the DC-to-DC module to perform a DC-to-DC operation on the first initial DC power to obtain a first target DC power, so that the motor control system operates in the AC charging mode. The AC power source is connected to the AC-to-DC module, which consists of the first inverter, the motor windings, and the second inverter. The first target DC power is used to charge the battery.

[0193] In this embodiment, the motor control system is not limited to operation in drive mode, but also includes control logic in AC charging mode. In AC charging mode, the first relay is closed, directly connecting the AC-to-DC module (e.g., the pre-amplifier PFC of the OBC) to the bus of the second inverter. This connection provides a physical path for converting AC power into DC power suitable for charging the battery.

[0194] In AC charging mode, the controller disconnects the second relay to isolate the DC power supply from the bus of the second inverter. Thus, in AC charging mode, the external AC power supply to the motor control system is the sole energy source for the charging process, eliminating the need for DC power.

[0195] After the motor control system enters AC charging mode, the AC-to-DC module can be controlled to convert the AC power received from the AC power source into initial DC power through rectification and power factor correction, and then the DC power flows to the bus of the second inverter. This conversion process can improve the effective utilization rate of AC power and reduce energy loss during battery charging.

[0196] After converting the alternating current (AC) into a first initial direct current (DC), a DC-to-DC module consisting of a first inverter, the windings of an open-winding motor, and a second inverter can further convert the first initial DC to obtain a first target DC. The DC-to-DC module, consisting of the first inverter, the open-winding motor windings, and the second inverter, can be a DC / DC circuit.

[0197] For example, in AC charging mode, this embodiment can take the U-phase winding and W-phase winding of an open-winding motor as an example, and use the U-phase winding, W-phase winding, bridge arm of the first inverter and bridge arm of the second inverter as DC / DC circuit.

[0198] This embodiment utilizes the inductive characteristics of the motor windings to control the bridge arms of the first and second inverters, adjusting the initial DC current to a more suitable target DC current for charging the battery. The setting of this target DC current involves the battery's charging characteristics and current charging needs, thereby maximizing the battery's charging efficiency and lifespan.

[0199] In this embodiment, during AC charging mode, closing the first relay ensures that AC power can flow smoothly into the motor control system. By controlling the first and second inverters, the initial DC power is converted into a target DC power suitable for charging the battery. Simultaneously, opening the second relay avoids interference from the DC power supply, thus ensuring the safety of charging the battery in AC charging mode.

[0200] As an optional implementation, the charging mode includes a DC charging mode. Step S601 involves responding to a control signal corresponding to the operating mode of the motor control system, controlling the first relay, the second relay, the first inverter, and the second inverter to enable the motor control system to operate in the corresponding operating mode. This includes: responding to the control signal corresponding to the DC charging mode, controlling the first relay to open, controlling the second relay to close, and controlling the buck-boost module to perform a boost or buck operation on the second initial DC power supplied by the DC power supply to obtain a second target DC power, so that the motor control system operates in the DC charging mode. The DC power supply is connected to a DC power supply connection port, the buck-boost module consists of the first inverter, the motor windings, and the second inverter, the battery connection port is used to connect the battery, and the second target DC power is used to charge the battery.

[0201] In this embodiment, in DC charging mode, the first relay is disconnected to isolate the AC-to-DC module (e.g., the pre-stage PFC of the OBC) from the bus of the second inverter, ensuring that AC power does not interfere with the DC charging process and guaranteeing the purity of DC charging of the battery.

[0202] In addition, the controller can also be used to control the closing of the second relay, establishing a direct connection between the DC power supply and the bus of the second inverter, thereby providing a constant DC power input path for the battery charging process.

[0203] After the motor control system enters DC charging mode, a buck-boost module (e.g., a Buck-Boost circuit) consisting of a first inverter, the windings of an open-winding motor, and a second inverter is controlled to boost or buck the second initial DC power supplied by the DC power source to match the voltage requirements for charging the battery. The flexibility of the buck-boost module in this embodiment stems from the inductive characteristics of the motor windings and the switching control of the bridge arms of the first and second inverters.

[0204] For example, in DC charging mode, the U-phase winding and W-phase winding can be used as an example. In this case, the first inverter, the winding of the open-winding motor, and the second inverter constitute a Buck-Boost circuit. By controlling the switching of the bridge arms of the first and second inverters—for example, controlling the opening of the upper U-phase bridge arm and the lower W-phase bridge arm of the first inverter, and controlling the opening of the upper U-phase bridge arm and the lower W-phase bridge arm of the second inverter—the second initial DC power supplied by the DC power source can be boosted or bucked to obtain the second target DC power.

[0205] For another example, the upper arm of the second inverter can be kept normally open to control the Boost circuit formed by the upper arm of the first inverter.

[0206] In this embodiment, in DC charging mode, an external DC power supply directly provides a second initial DC power to the bus of the second inverter via a second relay. The buck-boost module, consisting of the first inverter, the windings of the open-winding motor, and the second inverter, starts working and performs boost or buck operations on the second initial DC power according to the charging characteristics and needs of the battery to obtain a second target DC power. Delivering the second target DC power to the battery for charging ensures the efficiency and safety of battery charging, while avoiding overcharging or undercharging of the battery and extending its service life.

[0207] This embodiment, in DC charging mode, achieves efficient energy conversion from DC power to the battery through precise control of the first relay, the second relay, the first inverter, and the second inverter. This not only improves the speed and efficiency of battery charging but also simplifies the motor control system architecture and reduces costs by utilizing the motor windings and multiplexing the first and second inverters.

[0208] This embodiment proposes an open-winding motor control system that integrates OBC. The drive mode is equivalent to a hybrid power supply open-winding motor, and the charging mode reuses the inverter and motor windings. This realizes the full utilization of the advantages of the open-winding motor in the drive mode, while the first inverter and the second inverter are reused in the charging mode, thereby reducing costs.

[0209] The preferred embodiments of the above technical solutions of this application will be illustrated below.

[0210] With the increasing integration requirements of electric drive and control systems, all-in-one electric drive systems are gradually evolving from a three-in-one system combining the motor, electronic control, and reducer to an all-in-one system integrating charging and discharging functions. An all-in-one system can integrate a multi-function power supply and motor controller into a single housing. However, deeply integrated systems not only require components to be integrated into the same housing, but also require circuits and components to be reusable under different functions, thereby reducing the number of components and lightening the size and weight.

[0211] The all-in-one power supply may include an OBC (On-Board Cell), an on-board DC / DC converter, and control and drive circuitry. The motor controller may include an inverter, control circuitry, and drive circuitry. The OBC can be used to convert between the vehicle's high-voltage battery and external AC power, and may include a front-end PFC (Power Factor Correction) and a rear-end resonant converter (LLC). The on-board DC / DC converter is a device that boosts the voltage of external DC power to charge the high-voltage battery.

[0212] The aforementioned all-in-one power supply can multiplex the OBC's downstream DC / DC converter with the vehicle's DC / DC converter, thereby reducing costs. Regarding motor controllers, motors generally use closed-winding connections, while open-winding motors are gaining attention in vehicle drive applications due to their higher voltage utilization and power density. Furthermore, the open winding characteristic of open-winding motors makes it possible to multiplex the structure of both the motor inverter and the DC / DC converter. Achieving this multiplexing reduces costs, increases integration, and improves motor control performance.

[0213] Figure 7 This is a schematic diagram of a motor drive system based on related technologies. For example... Figure 7 The diagram shows a motor drive and charge / discharge control circuit that reuses the OBC bridge arm as one end of the inverter for an open-winding motor. The high-voltage battery 71 is connected to the OBC's downstream DC / DC converter, which in turn connects to the OBC's upstream PFC. The three phases of the OBC's upstream PFC are connected to one end of the open-winding motor windings, serving as a three-phase drive bridge for one side of the motor. Simultaneously, the three phases of the OBC's upstream PFC are connected to a single-phase / three-phase charge / discharge switch for charging and discharging. A busbar is directly led out from the high-voltage battery and connected to the inverter on the other side of the open-winding motor.

[0214] However, the above method only realizes the reuse of the inverter on the open winding motor side, while the boost / buck circuit composed of inverter 721, motor winding, and inverter 723 itself is not fully utilized.

[0215] Figure 8 This is a schematic diagram of another motor drive system based on related technologies. For example... Figure 8 The diagram shows a circuit that reuses the inverters on both sides of an open-winding motor and the motor windings as a DC-AC conversion, boost / buck converter to charge and discharge a battery. This circuit can reuse the motor windings as an inductor to boost the voltage in DC charging mode.

[0216] However, the inverters on both sides of the aforementioned open-winding motor have a single power supply and common bus structure. In drive mode, suppressing zero-sequence current will lead to a reduction in voltage utilization.

[0217] In addition, the open-winding motor and on-board charger integrated design circuits mostly use common bus configurations, which have the problem of difficulty in suppressing zero-sequence current in drive mode.

[0218] Based on the above, this application proposes an integrated design scheme for on-board charging and motor controller based on an open-winding motor and its drive circuit, and also proposes a vehicle that applies this design scheme, which can be an electric vehicle.

[0219] This embodiment reuses the motor windings and inverters on both sides as a DC / DC circuit, thereby reducing the number of components used in the all-in-one system. Simultaneously, in drive mode, the inverter can employ a floating capacitor hybrid power supply connection, which can prevent zero-sequence current from being generated in drive mode.

[0220] This embodiment employs a floating capacitor hybrid power supply open winding motor control system, and the inverter and winding inductor can serve as DC / DC devices for an on-board charger.

[0221] From the above Figures 1B to 5 As can be seen, the embodiments of this application propose an open-winding motor control system that integrates an OBC (On-Board Converter), which is equivalent to a hybrid power supply open-winding motor in drive mode, and a multiplexed inverter and motor windings in charging mode. In drive mode, it can fully utilize the advantages of the open-winding motor, while simultaneously achieving inverter reuse in both AC and DC charging modes, thus reducing costs.

[0222] As an alternative example, this embodiment can employ different forms of OBC rectifier circuits. For instance, a passive full-wave bridge rectifier can be used instead of a synchronous rectifier.

[0223] As another alternative example, this embodiment can employ a boost / buck circuit formed by different switching strategies for the first and second inverters. For instance, the upper arm of the second inverter can be normally open to control the boost circuit formed by the upper arm of the first inverter.

[0224] As another alternative example, this embodiment can use different types of power chips as bridge arm chips, such as SiC, GaN, IGBT, etc.

[0225] As another alternative example, this embodiment can eliminate the structure formed by AC charging and retain only the structure formed by DC charging, or eliminate the structure formed by DC charging and retain only the structure formed by AC charging.

[0226] This embodiment proposes a design scheme that integrates an open-winding motor and an OBC (On-Board Circuit) and DC charging, which can realize the functions of drive mode, AC charging mode and DC charging mode on the same topology; it can reuse the first inverter, motor winding and second inverter as DC / DC circuit to work in AC charging mode and DC charging mode, which can reduce the number of components used and reduce costs.

[0227] This application provides a control device for a motor control system. This device, applied to the motor control system of this application, can be used to execute the control method of the motor control system of this invention.

[0228] Figure 9This is a schematic diagram of a control device applied to a motor control system according to an embodiment of this application. Figure 9 As shown, the control device 90 of the motor control system may include: a control unit 91.

[0229] The control unit 91 is used to respond to control signals corresponding to the operating mode of the motor control system, and control the first relay, the second relay, the first inverter, and the second inverter so that the motor control system operates in the corresponding operating mode, wherein the operating mode includes one of the drive mode and the charging mode.

[0230] In the control device of the motor control system in the embodiments of this application, the advantages of the motor can be fully utilized in the driving mode, and the first inverter and the second inverter, as well as the N-phase winding of the motor, can be reused in the charging mode. This reduces hardware redundancy, avoids the limited reuse of the converter and motor winding, brings flexibility to the operation of the electric drive system, thereby improving the control efficiency of the motor control system and solving the technical problem of low control efficiency of the motor control system.

[0231] Embodiments of this application also provide a vehicle, including: a memory storing an executable program; and a processor for running the program, wherein the program executes the methods described in various embodiments of this application when it runs.

[0232] Figure 10 This is a structural block diagram of a vehicle according to an embodiment of this application. Figure 10 As shown, the components of the vehicle 1000 include, but are not limited to, a memory 1010 and a processor 1020. The processor 1020 and the memory 1010 are connected via a bus 1030, and the database 1060 is used to store data.

[0233] Vehicle 1000 may also include access device 1040, which enables vehicle 1000 to communicate via one or more networks 1050. Examples of these networks include Public Switched Telephone Network (PSTN), Local Area Network (LAN), Wide Area Network (WAN), Personal Area Network (PAN), or combinations of communication networks such as the Internet. Access device 1040 may include one or more of any type of wired or wireless network interface (e.g., network interface controller (NIC)), such as an IEEE 502.11 Wireless Local Area Network (WLAN) wireless interface, a Worldwide Interoperability for Microwave Access (Wi-MAX) interface, an Ethernet interface, a Universal Serial Bus (USB) interface, a cellular network interface, a Bluetooth interface, a Near Field Communication (NFC) interface, and so on.

[0234] In one embodiment of this disclosure, the aforementioned components of vehicle 1000 and Figure 10 Other components not shown can also be connected to each other, for example, via a bus. It should be understood that... Figure 10 The illustrated block diagram of an autonomous vehicle is for illustrative purposes only and is not intended to limit the scope of this disclosure. Those skilled in the art can add or replace other components as needed.

[0235] Embodiments of this application also provide a computer-readable storage medium including a stored executable program, wherein, when the executable program is running, it controls the device where the computer-readable storage medium is located to perform the methods of various embodiments of this application.

[0236] Embodiments of this application also provide a computer program product, including a computer program that, when executed by a processor, implements the methods of various embodiments of this application.

[0237] Embodiments of this application also provide a computer program product, including a non-volatile computer-readable storage medium for storing a computer program that, when executed by a processor, implements the methods in various embodiments of this application.

[0238] Embodiments of this application also provide a computer program that, when executed by a processor, implements the methods described in the various embodiments of this application.

[0239] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties. Furthermore, the collection, use and processing of the relevant data must comply with the relevant laws, regulations and standards of the relevant countries and regions, and corresponding operation entry points are provided for users to choose to authorize or refuse.

[0240] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0241] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0242] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0243] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0244] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, read-only memory (ROM), random access memory (RAM), portable hard drive, magnetic disk, or optical disk.

[0245] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A motor control system, characterized in that, include: The system includes a battery connection port, a first inverter, a motor, a second inverter, a first relay, a second relay, an AC-to-DC module, a DC power supply connection port, and a controller. The battery connection port is used to connect a battery. The first inverter is connected to the battery connection port and includes an N-phase first bridge arm; The motor includes an N-phase winding, and the first end of the N-phase winding is connected to the neutral point of the first bridge arm of the N-phase winding respectively. The second inverter includes an N-phase second bridge arm, the neutral point of which is connected to the second end of the N-phase winding respectively; The first relay is connected between the same end of the second bridge arm of the N-phase circuit and the AC-to-DC module; The second relay is connected between the same end of the second bridge arm of the N-phase and the DC power supply connection port; The controller is connected to the first relay, the second relay, the N-phase first bridge arm, and the N-phase second bridge arm, and is used to control the first relay, the second relay, the first inverter, and the second inverter to enable the motor control system to operate in a corresponding working mode, wherein the working mode includes one of a drive mode and a charging mode.

2. The motor control system according to claim 1, characterized in that, The first relay is connected between the first end of the second bridge arm of the N-phase and the first end of the AC-to-DC module, wherein the first end of the second bridge arm of the N-phase is connected to the first side DC bus of the second inverter, the second end of the second bridge arm of the N-phase is connected to the second end of the AC-to-DC module, and the second end of the second bridge arm of the N-phase is connected to the second side DC bus of the second inverter. The second relay is connected between the first end of the second bridge arm of the N-phase and the positive port of the DC power supply connection port, wherein the negative port of the DC power supply connection port is connected to the second side DC bus of the second inverter.

3. The motor control system according to claim 1, characterized in that, The motor control system further includes: a first capacitor connected in parallel with the second inverter; the controller is used to control the first relay, the second relay, the first inverter, and the second inverter in response to a control signal corresponding to the drive mode, so that the motor control system operates in the corresponding drive mode, wherein... In the first bridge arm of N phases, the state of at least one upper bridge arm is the same as the state of the lower bridge arms of the remaining phases. In the second bridge arm of N phases, the state of one upper bridge arm is the same as the state of the lower bridge arms of the remaining phases, so as to charge the first capacitor. or, In the first bridge arm of N phases, the state of the upper bridge arm of one phase is the same as the state of the lower bridge arms of the other phases. In the second bridge arm of N phases, the state of the upper bridge arm of one phase is the same as the state of the lower bridge arms of the other phases, so as to discharge the first capacitor and the battery. Both the first relay and the second relay are in the off state.

4. The motor control system according to claim 3, characterized in that, Regarding the charging of the first capacitor, wherein, In the first bridge arm of N phases, at least one phase upper bridge arm is in a closed state, the remaining phase lower bridge arms are in a closed state, and the other bridge arms in the first bridge arm of N phases are in an open state. In the second bridge arm of phase N, at least one phase upper bridge arm is in a closed state, the remaining phase lower bridge arms are in a closed state, and the other bridge arms in the second bridge arm of phase N are in an open state.

5. The motor control system according to claim 3, characterized in that, Discharging the first capacitor and the battery, wherein, In the first bridge arm of N phases, one phase upper bridge arm is in a closed state, the other phase lower bridge arms are in a closed state, and the other bridge arms in the first bridge arm of N phases are all in an open state. In the second bridge arm of phase N, one phase upper bridge arm is in a closed state, the remaining phase lower bridge arms are in a closed state, and the other bridge arms in the second bridge arm of phase N are all in an open state.

6. The motor control system according to claim 1, characterized in that, The controller is used to control the first relay, the second relay, the first inverter, and the second inverter in response to the control signal corresponding to the charging mode, so that the motor control system operates in the corresponding charging mode, wherein... In the first bridge arm of N phases, the state of the upper bridge arm of one phase is the same as the state of the lower bridge arm of the other phase. In the second bridge arm of N phases, the state of the upper bridge arm of one phase is the same as the state of the lower bridge arms of the other phases; One of the first relay and the second relay is in a closed state, and the other relay is in an open state.

7. The motor control system according to claim 6, characterized in that, The charging mode is AC charging mode. In the first bridge arm of N phases, one phase upper bridge arm is in a closed state, the other phase lower bridge arm is in a closed state, and the other bridge arms in the first bridge arm of N phases are all in an open state. In the second bridge arm of N phases, one phase upper bridge arm is in a closed state, the other phase lower bridge arm is in a closed state, and the other bridge arms in the second bridge arm of N phases are all in an open state. In the AC-to-DC module, one phase upper bridge arm is in a closed state to be connected to the positive terminal of the AC power supply, and the other phase lower bridge arm is in a closed state to be connected to the negative terminal of the AC power supply. All other bridge arms in the AC-to-DC module are in an open state, and the AC power supply is connected to the AC-to-DC module. The first relay is in the closed state, and the second relay is in the open state.

8. The motor control system according to claim 6, characterized in that, The charging mode is a DC charging mode. In the first bridge arm of N phases, one phase upper bridge arm is in a closed state, the other phase lower bridge arm is in a closed state, and the other bridge arms in the first bridge arm of N phases are all in an open state. In the second bridge arm of N phases, one phase upper bridge arm is in a closed state, the other phase lower bridge arm is in a closed state, and the other bridge arms in the second bridge arm of N phases are all in an open state. The first relay is in the open state, and the second relay is in the closed state.

9. The motor control system according to any one of claims 1 to 8, characterized in that, The motor control system also includes: The second capacitor is connected in parallel with the first inverter.

10. A control method for a motor control system, characterized in that, The method is applied to the motor control system according to any one of claims 1 to 9, comprising: In response to a control signal corresponding to the operating mode of the motor control system, the first relay, the second relay, the first inverter, and the second inverter are controlled to enable the motor control system to operate in the corresponding operating mode, wherein the operating mode includes one of a drive mode and a charging mode.

11. The method according to claim 10, characterized in that, The response to the control signal corresponding to the operating mode of the motor control system controls the first relay, the second relay, the first inverter, and the second inverter to enable the motor control system to operate in the corresponding operating mode, including: In response to the control signal corresponding to the drive mode, the first relay and the second relay are disconnected, and the voltage of the first inverter is controlled to be a first target voltage, and the voltage of the second inverter is controlled to be a second target voltage, so that the motor control system operates the drive mode; The first target voltage and the second target voltage are used to drive the motor to work, and the battery is used to provide power to the motor in the driving mode.

12. The method according to claim 11, characterized in that, The motor control system includes a first capacitor, which is connected in parallel with the second inverter. The method further includes: During the process of driving the motor to work through the first target voltage and the second target voltage, a charging operation is performed on the first capacitor, or a discharging operation is performed on the first capacitor and the battery.

13. The method according to claim 10, characterized in that, The charging mode includes an AC charging mode. The response to the control signal corresponding to the operating mode of the motor control system controls the first relay, the second relay, the first inverter, and the second inverter to enable the motor control system to operate in the corresponding operating mode, including: In response to the control signal corresponding to the AC charging mode, the first relay is controlled to close, the second relay is controlled to open, the AC to DC module is controlled to convert the AC power supplied by the AC power source into a first initial DC power, and the DC to DC module is controlled to perform a DC to DC operation on the first initial DC power to obtain a first target DC power, so that the motor control system runs the AC charging mode; The AC power supply is connected to the AC-to-DC module, which consists of the first inverter, the motor windings, and the second inverter. The first target DC power is used to charge the battery.

14. The method according to claim 10, characterized in that, The charging mode includes a DC charging mode. The response to the control signal corresponding to the operating mode of the motor control system controls the first relay, the second relay, the first inverter, and the second inverter to enable the motor control system to operate in the corresponding operating mode, including: In response to the control signal corresponding to the DC charging mode, the first relay is controlled to open, the second relay is controlled to close, and the buck-boost module is controlled to perform a boost or buck operation on the second initial DC power supplied by the DC power supply to obtain a second target DC power, so that the motor control system can operate the DC charging mode. The DC power supply is connected to the DC power supply connection port. The step-up / step-down module consists of the first inverter, the windings of the motor, and the second inverter. The battery connection port is used to connect the battery, and the second target DC power supply is used to charge the battery.

15. A vehicle, characterized in that, include: Memory, which stores executable programs; A processor for running the program, wherein the program, when running, performs the method according to any one of claims 10 to 14.

16. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored executable program, wherein, when the executable program is executed, it controls the device on which the storage medium is located to perform the method according to any one of claims 10 to 14.

17. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method according to any one of claims 10 to 14.

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