CN-122001249-A - Electric drive system, control method of electric drive system and vehicle

Abstract

The application discloses an electric drive system, a control method of the electric drive system and a vehicle. The electric drive system comprises a battery connection port, a first inverter, a motor, a second inverter, at least one relay, a controller and an energy supply equipment connection port, wherein the motor comprises an N-phase winding, a second inverter comprises an N-phase second bridge arm, the neutral points of the N-phase second bridge arm are respectively and correspondingly connected with the second end of the N-phase winding, the relay is connected between the same end of the N-phase first bridge arm and the same end of the N-phase second bridge arm, the same end of the N-phase second bridge arm is connected with the energy supply equipment connection port, and the controller is connected with the relay, the N-phase first bridge arm and the N-phase second bridge arm and used for controlling the relay, the first inverter and the second inverter to enable the electric drive system to operate in a corresponding working mode. The application solves the technical problem of low control efficiency of the electric drive system.

Inventors

• WANG YUNSONG
• WANG HAO
• YU DAYANG
• LIU KAIYANG
• QI HONGGANG

Assignees

• 广州小鹏汽车科技有限公司

Dates

Publication Date

20260508

Application Date

20260114

Claims (17)

1. 1. An electric drive system is characterized by comprising a battery connection port, a first inverter, a motor, a second inverter, at least one relay, a controller and an energy supply equipment connection port, wherein, The first inverter is connected with the battery connection port and comprises an N-phase first bridge arm; the motor comprises an N-phase winding, and first ends of the N-phase winding are respectively and correspondingly connected with neutral points of the N-phase first bridge arm; The second inverter comprises N-phase second bridge arms, and neutral points of the N-phase second bridge arms are correspondingly connected with second ends of the N-phase windings respectively; the relay is connected between the same end of the N-phase first bridge arm and the same end of the N-phase second bridge arm, and the same end of the N-phase second bridge arm is connected with the energy supply equipment connection port; The controller is connected with the relay, the N-phase first bridge arm and the N-phase second bridge arm and is used for controlling the relay, the first inverter and the second inverter to enable the electric drive system to operate in corresponding working modes, wherein the working modes comprise at least one of a boosting charging mode, a step-down charging mode, a direct charging mode and a heating mode.
2. 2. The electric drive system of claim 1, wherein the relay comprises: the first relay is connected between the first end of the N-phase first bridge arm and the first end of the N-phase second bridge arm, wherein the first end of the N-phase first bridge arm is connected with a first side direct current bus of the first inverter, the first end of the N-phase second bridge arm is connected with a first side direct current bus of the second inverter, and the first end of the N-phase second bridge arm is connected with the positive electrode of the energy supply equipment connecting port; and/or the number of the groups of groups, The second relay is connected between the second end of the first bridge arm and the second end of the second bridge arm, wherein the second end of the first bridge arm is connected with a second side direct current bus of the first inverter, the second end of the second bridge arm is connected with a second side direct current bus of the second inverter, the second end of the second bridge arm is connected with a negative electrode of the energy supply equipment connecting port, or the second end of the second bridge arm is connected with a negative electrode of the energy supply equipment connecting port.
3. 3. The electric drive system of claim 2, wherein the power supply device connection port is configured to connect a power supply device, the boost charging mode includes a first boost charging mode, the controller is configured to control the relay, the first inverter, and the second inverter in response to a control signal corresponding to the first boost charging mode, to cause the electric drive system to operate the corresponding first boost charging mode using a voltage of the power supply device, wherein, In the second bridge arm of the N phases, at least one phase of upper bridge arm is in a closed state or at least one phase of lower bridge arm is in a closed state; in the first bridge arm of the N phases, the state of an upper bridge arm of each phase in at least one phase of bridge arm is different from the state of a lower bridge arm of each phase; The relay comprises the first relay and the second relay, one relay of the first relay and the second relay is in a closed state, the other relays are in an open state, or the relay comprises the second relay and the second relay is in a closed state, or the relay comprises the first relay and the first relay is in a closed state.
4. 4. An electro-motive system as defined in claim 3, wherein, In the second bridge arm of the N phases, under the condition that at least one upper bridge arm of the N phases is in a closed state, other bridge arms in the second bridge arm of the N phases are all in an open state; In the first bridge arm of the N phases, each phase of upper bridge arm in at least one phase of bridge arm is alternately switched between a closed state and an open state, each phase of lower bridge arm is alternately switched between the closed state and the open state, and the state of each phase of upper bridge arm is different from the state of each phase of lower bridge arm at the same time so as to charge or discharge the N phase winding; the relay comprises the first relay and the second relay, the second relay is in a closed state, and the first relay is in an open state, or the relay comprises the second relay, and the second relay is in a closed state; Or alternatively In the second bridge arm of the N phases, under the condition that at least one lower bridge arm is in a closed state, other bridge arms in the second bridge arm of the N phases are all in an open state; In the first bridge arm of the N phases, each phase of upper bridge arm in at least one phase of bridge arm is alternately switched between a closed state and an open state, each phase of lower bridge arm is alternately switched between the closed state and the open state, and the state of each phase of upper bridge arm is different from the state of each phase of lower bridge arm at the same time so as to charge or discharge the N phase winding; the relay comprises the first relay and the second relay, wherein the first relay is in a closed state, and the second relay is in an open state; And In at least one phase of the first bridge arm of the N phases, the state of each phase of the upper bridge arm and the state of each phase of the lower bridge arm at the same moment are used for enabling windings of the motor to generate current meeting a first target condition, and enabling the motor not to generate torque, wherein the first target condition is determined based on target charging current of the energy supply equipment.
5. 5. The electric drive system of claim 2, wherein the power supply device connection port is configured to connect a power supply device, the boost charging mode includes a second boost charging mode, the controller is configured to control the relay, the first inverter, and the second inverter in response to a control signal corresponding to the second boost charging mode, to cause the electric drive system to operate the corresponding second boost charging mode using a voltage of the power supply device, wherein, In the second bridge arm of the N phases, the state of the lower bridge arm of one phase is the same as the state of the upper bridge arm of the other phase; in the first bridge arm of the N phases, the state of an upper bridge arm of one phase is different from the state of a lower bridge arm of one phase; The relay comprises the first relay and the second relay, wherein the first relay and the second relay are in an off state, or the relay comprises the first relay and the first relay is in an off state, or the relay comprises the second relay and the second relay is in an off state.
6. 6. The electro-mechanical system of claim 5, wherein, In the N phases of the second bridge arms, one phase of the lower bridge arm is in a closed state, the other one phase of the upper bridge arm is in a closed state, and the other bridge arms in the N phases of the second bridge arms are all in an open state; In the first bridge arm of the N phases, an upper bridge arm of one phase is alternately switched between a closed state and an open state, a lower bridge arm of one phase is alternately switched between the closed state and the open state, the states of the upper bridge arm of one phase and the lower bridge arm of one phase are different at the same time, the other lower bridge arms of one phase are in the closed state, and the other bridge arms of the first bridge arm of the N phases are all in the open state, so that two-phase windings in the N-phase windings are charged or discharged; Or alternatively In the N-phase second bridge arm, one phase lower bridge arm is in a closed state, the other two phases upper bridge arms are in a closed state, and other bridge arms in the N-phase second bridge arm are all in an open state; in the first bridge arm of the N phases, an upper bridge arm of one phase is alternately switched between a closed state and an open state, a lower bridge arm of one phase is alternately switched between the closed state and the open state, the states of the upper bridge arm of one phase and the lower bridge arm of one phase are different at the same time, the other lower bridge arms of one phase are in the closed state, the other upper bridge arms of the other phases are in the closed state, and the other bridge arms of the first bridge arm of the N phases are all in the open state, so that the three-phase winding in the N-phase winding is charged or discharged; And In the first bridge arm of the N phases, the state of an upper bridge arm of one phase and the state of a lower bridge arm of one phase at the same time are used for enabling windings of the motor to generate current meeting a first target condition, and enabling the motor not to generate torque, wherein the first target condition is determined based on target charging current of the energy supply equipment.
7. 7. The electric drive system of claim 2, wherein the power supply device connection port is configured to connect a power supply device, the buck charging mode includes a first buck charging mode, the controller is configured to control the relay, the first inverter, and the second inverter in response to a control signal corresponding to the first buck charging mode, to cause the electric drive system to operate the corresponding first buck charging mode using a voltage of the power supply device, wherein, In the second bridge arm of the N phases, the state of the upper bridge arm of each phase in at least one phase bridge arm is different from the state of the lower bridge arm of each phase; In the first bridge arm of the N phases, at least one phase of upper bridge arm is in a closed state or at least one phase of lower bridge arm is in a closed state; The relay comprises the first relay and the second relay, one relay of the first relay and the second relay is in a closed state, the other relays are in an open state, or the relay comprises the second relay which is in a closed state, the relay comprises the first relay, and the first relay is in a closed state.
8. 8. The electro-mechanical system of claim 7, wherein, In the second bridge arm of the N phases, each phase of upper bridge arm in at least one phase of bridge arm is alternately switched between an open state and a closed state, each phase of lower bridge arm is alternately switched between the open state and the closed state, and the state of each phase of upper bridge arm is different from the state of each phase of lower bridge arm at the same time, so that the N-phase winding is charged or discharged; in the first bridge arm of the N phases, under the condition that at least one upper bridge arm of the N phases is in a closed state, other bridge arms in the first bridge arm of the N phases are all in an open state; the relay comprises the first relay and the second relay, the second relay is in a closed state, and the first relay is in an open state, or the relay comprises the second relay, and the second relay is in a closed state; Or alternatively In the second bridge arm of the N phases, each phase of upper bridge arm in at least one phase of bridge arm is alternately switched between a closed state and an open state, each phase of lower bridge arm is alternately switched between the open state and the closed state, and the state of each phase of upper bridge arm is different from the state of each phase of lower bridge arm at the same time, so that the N-phase winding is charged or discharged; In the first bridge arm of the N phases, under the condition that at least one lower bridge arm is in a closed state, other bridge arms in the first bridge arm of the N phases are all in an open state; the relay comprises the first relay and the second relay, wherein the first relay is in a closed state, and the second relay is in an open state; And In at least one phase of the second bridge arm of the N phases, the state of the upper bridge arm and the state of the lower bridge arm of each phase at the same moment are used for enabling windings of the motor to generate current meeting a first target condition, and enabling the motor not to generate torque, wherein the first target condition is determined based on target charging current of the energy supply equipment.
9. 9. The electric drive system of claim 2, wherein the power supply device connection port is configured to connect a power supply device, the buck charging mode includes a second buck charging mode, the controller is configured to control the relay, the first inverter, and the second inverter in response to a control signal corresponding to the second buck charging mode, to cause the electric drive system to operate the corresponding second buck charging mode using a voltage of the power supply device, wherein, In the second bridge arm of the N phases, the state of an upper bridge arm of one phase is different from the state of a lower bridge arm of one phase; in the first bridge arm of the N phases, the state of a lower bridge arm of one phase is the same as the state of an upper bridge arm of the other phase; The relay comprises the first relay and the second relay, wherein the first relay and the second relay are in an off state, or the relay comprises the first relay and the first relay is in an off state, or the relay comprises the second relay and the second relay is in an off state.
10. 10. An electro-motive system as defined in claim 9, wherein, In the second bridge arm of the N phases, an upper bridge arm of one phase is alternately switched between a closed state and an open state, a lower bridge arm of one phase is alternately switched between the closed state and the open state, the states of the upper bridge arm of one phase and the lower bridge arm of one phase are different at the same time, the other upper bridge arms of one phase are in the closed state, and the other bridge arms of the second bridge arm of the N phases are all in the open state, so that two-phase windings in the N-phase windings are charged or discharged; in the N-phase first bridge arm, a lower bridge arm of one phase is in a closed state, the other upper bridge arms of the other phases are in a closed state, and other bridge arms in the N-phase first bridge arm are all in an open state; Or alternatively In the second bridge arm of the N phases, an upper bridge arm of one phase is alternately switched between a closed state and an open state, a lower bridge arm of one phase is alternately switched between the closed state and the open state, the states of the upper bridge arm of one phase and the lower bridge arm of one phase are different at the same time, the other upper bridge arms of the two phases are in the closed state, and the other bridge arms of the second bridge arm of the N phases are all in the open state, so that the three-phase winding in the N-phase winding is charged or discharged; in the N-phase first bridge arm, a lower bridge arm of one phase is in a closed state, the other upper bridge arms of the other two phases are in a closed state, and other bridge arms in the N-phase first bridge arm are all in an open state; And In the second bridge arm of the N phases, the state of an upper bridge arm of one phase and the state of a lower bridge arm of one phase at the same time are used for enabling windings of the motor to generate current meeting a first target condition, and enabling the motor not to generate torque, wherein the first target condition is determined based on target charging current of the energy supply equipment.
11. 11. The electric drive system of claim 2, wherein the power supply device connection port is configured to connect a power supply device, the controller is configured to control the relay, the first inverter, and the second inverter in response to a control signal corresponding to the direct charge mode to cause the electric drive system to operate the corresponding direct charge mode using a voltage of the power supply device, The N-phase upper bridge arm and the N-phase lower bridge arm in the N-phase second bridge arm and the N-phase upper bridge arm and the N-phase lower bridge arm in the N-phase first bridge arm are in an open state; The relay comprises the first relay and the second relay, and the first relay and the second relay are in a closed state; Or alternatively In the second bridge arm of the N phases, the state of the upper bridge arm of each phase in at least one phase bridge arm is different from the state of the lower bridge arm of each phase; In the first bridge arm of the N phases, the states of at least two upper bridge arms or at least two lower bridge arms are the same; The relay comprises the second relay which is in a closed state, or the relay comprises the first relay which is in a closed state.
12. 12. The electro-mechanical system of claim 11, wherein the electrical power is electrically coupled to the drive system, In the second bridge arm of the N phases, each phase of upper bridge arm in at least one phase of bridge arm is alternately switched between a closed state and an open state, each phase of lower bridge arm is alternately switched between the closed state and the open state, and the state of each phase of upper bridge arm is different from the state of each phase of lower bridge arm at the same time, so that the N-phase winding is charged or discharged; in the first bridge arm of the N phases, under the condition that at least one upper bridge arm of the N phases is in a closed state, other bridge arms in the first bridge arm of the N phases are all in an open state; The relay comprises the second relay, and the second relay is in a closed state; Or alternatively In the second bridge arm of the N phases, each phase of upper bridge arm in at least one phase of bridge arm is alternately switched between a closed state and an open state, each phase of lower bridge arm is alternately switched between the closed state and the open state, and the state of each phase of upper bridge arm is different from the state of each phase of lower bridge arm at the same time, so that the N-phase winding is charged or discharged; In the first bridge arm of the N phases, under the condition that at least one lower bridge arm is in a closed state, other bridge arms in the first bridge arm of the N phases are all in an open state; the relay comprises the first relay, and the first relay is in a closed state; And In at least one phase of the second bridge arm of the N phases, the state of the upper bridge arm and the state of the lower bridge arm of each phase at the same moment are used for enabling windings of the motor to generate current meeting a first target condition, and enabling the motor not to generate torque, wherein the first target condition is determined based on target charging current of the energy supply equipment.
13. 13. The electric drive system of claim 2, wherein the controller is configured to control the relay, the first inverter, and the second inverter in response to control signals corresponding to the heating modes to cause the electric drive system to operate in the corresponding heating modes, wherein, In the second bridge arm of the N phases, the states of the lower bridge arm of the N phases or the upper bridge arm of the N phases are the same; in the first bridge arm of the N phases, the state of an upper bridge arm of each phase is different from the state of a lower bridge arm of each phase; The relay comprises the first relay and the second relay, one relay of the first relay and the second relay is in a closed state, the other relays are in an open state, or the relay comprises the second relay and the second relay is in a closed state, or the relay comprises the first relay and the first relay is in a closed state.
14. 14. The electro-mechanical system of claim 13, wherein the electrical power is electrically coupled to the drive system, In the N-phase second bridge arm, the N-phase lower bridge arm is in a closed state, and other bridge arms in the N-phase second bridge arm are in an open state; In the first bridge arm of the N phases, each upper bridge arm of the N phases is alternately switched between a closed state and an open state, each lower bridge arm of the N phases is alternately switched between the closed state and the open state, the states of the upper bridge arm of the N phases and the lower bridge arm of the N phases are different at the same time, the states of the upper bridge arm of the N phases in the first bridge arm of the N phases are the same, and the states of the lower bridge arm of the N phases in the first bridge arm of the N phases are the same; the relay comprises the first relay and the second relay, the second relay is in a closed state, and the first relay is in an open state, or the relay comprises the second relay, and the second relay is in a closed state; Or alternatively In the N-phase second bridge arm, the N-phase upper bridge arm is in a closed state, and other bridge arms in the N-phase second bridge arm are in an open state; In the first bridge arm of the N phases, each upper bridge arm of the N phases is alternately switched between a closed state and an open state, each lower bridge arm of the N phases is alternately switched between the closed state and the open state, the states of the upper bridge arm of the N phases and the lower bridge arm of the N phases are different at the same time, the states of the upper bridge arm of the N phases in the first bridge arm of the N phases are the same, and the states of the lower bridge arm of the N phases in the first bridge arm of the N phases are the same; the relay comprises the first relay and the second relay, wherein the first relay is in a closed state, and the second relay is in an open state; And In the first bridge arm of the N phases, the state of the upper bridge arm of each phase and the state of the lower bridge arm of each phase at the same time are used for enabling windings of the motor to generate current meeting a second target condition, and enabling the motor not to generate torque, wherein the second target condition is determined based on heating required power and target resistance of the electric drive system.
15. 15. A control method of an electric drive system, characterized in that the method is applied to the electric drive system according to any one of claims 1 to 14, comprising: And responding to a control signal corresponding to the working mode of the electric drive system, and controlling the relay, the first inverter and the second inverter to enable the electric drive system to operate in a corresponding working mode, wherein the working mode comprises at least one of a boosting charging mode, a step-down charging mode, a direct charging mode and a heating mode.
16. 16. The method of claim 15, wherein controlling the relay, the first inverter, and the second inverter to operate the electric drive system in the corresponding modes of operation in response to control signals corresponding to the modes of operation of the electric drive system comprises: Determining a control strategy of the relay, the first inverter and the second inverter in the working mode in response to a control signal corresponding to the working mode of the electric drive system, wherein the control strategy is used for representing a rule for controlling the relay, the first inverter and the second inverter; And executing control operation on the relay, the first inverter and the second inverter according to the control strategy so as to enable the electric drive system to operate in a corresponding working mode.
17. 17. A vehicle, characterized by comprising: A memory storing an executable program; A processor for running the program, wherein the program when run performs the method of claim 15 or 16.

Description

Electric drive system, control method of electric drive system and vehicle Technical Field The application relates to the technical field of vehicles, in particular to an electric drive system, a control method of the electric drive system and a vehicle. Background At present, an electric drive system (for example, an open winding motor drive system) in a vehicle can be composed of an open winding motor, two ac/dc converters and a speed reducer, and can be divided into a common bus type, a hybrid power type and a dual independent power type according to different power supply modes of a dc side. However, the current open winding motor driving system has a single function, and is difficult to meet various requirements of boost charging, buck charging, battery heating and the like. Boost charging and buck charging become necessary when faced with energy supply devices of different voltage classes. In the related art, the difference between the voltage of the charging pile and the voltage of the battery pack is often adapted by adding an additional boost converter or a buck converter, but the charging pile and the battery pack occupy precious space resources, and the manufacturing cost and the complexity of an electric drive system are increased, so that the control efficiency is affected. Therefore, there is still a technical problem that the control efficiency of the electric drive system is low. Therefore, no effective solution has been proposed at present to the above-described problems. Disclosure of Invention The embodiment of the application provides an electric drive system, a control method of the electric drive system and a vehicle, which aim to at least partially solve the technical problem of low control efficiency of the electric drive system. According to one aspect of an embodiment of the present application, an electro-drive system is provided. The electric drive system comprises a battery connection port, a first inverter, a motor, a second inverter, at least one relay, a controller and an energy supply equipment connection port, wherein the first inverter is connected with the battery connection port and comprises an N-phase first bridge arm, the motor comprises an N-phase winding, the first end of the N-phase winding is correspondingly connected with the neutral point of the N-phase first bridge arm respectively, the second inverter comprises an N-phase second bridge arm, the neutral point of the N-phase second bridge arm is correspondingly connected with the second end of the N-phase winding respectively, the relay is connected between the same end of the N-phase first bridge arm and the same end of the N-phase second bridge arm, the same end of the N-phase second bridge arm is connected with the energy supply equipment connection port, and the controller is connected with the relay, the N-phase first bridge arm and the N-phase second bridge arm and used for controlling the relay, the first inverter and the second inverter to enable the electric drive system to operate in corresponding working modes, wherein the working modes comprise at least one of a boosting charging mode, a step-down charging mode, a direct charging mode and a heating mode. Optionally, the relay comprises a first relay connected between a first end of the N-phase first bridge arm and a first end of the N-phase second bridge arm, wherein the first end of the N-phase first bridge arm is connected with a first side direct current bus of the first inverter, the first end of the N-phase second bridge arm is connected with a first side direct current bus of the second inverter, the first end of the N-phase second bridge arm is connected with an anode of the power supply device connection port, and/or the second relay is connected between a second end of the N-phase first bridge arm and a second end of the N-phase second bridge arm, wherein the second end of the N-phase first bridge arm is connected with a second side direct current bus of the first inverter, the second end of the N-phase second bridge arm is connected with a cathode of the power supply device connection port, or the second end of the N-phase first bridge arm is connected with a cathode of the power supply device connection port. Optionally, the energy supply device connection port is used for connecting energy supply devices, the boost charging mode comprises a first boost charging mode, the controller is used for responding to control signals corresponding to the first boost charging mode, and controlling the relay, the first inverter and the second inverter to enable the electric drive system to operate the corresponding first boost charging mode by utilizing voltage of the energy supply devices, wherein in the N-phase second bridge arm, at least one phase upper bridge arm is in a closed state or at least one phase lower bridge arm is in a closed state, in the N-phase first bridge arm, the state of each phase upper bridge arm in the at least one phase bridg