CN113829956A - Drive system for vehicle, control method of drive system and vehicle - Google Patents

Drive system for vehicle, control method of drive system and vehicle Download PDF

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Publication number
CN113829956A
CN113829956A CN202010591851.3A CN202010591851A CN113829956A CN 113829956 A CN113829956 A CN 113829956A CN 202010591851 A CN202010591851 A CN 202010591851A CN 113829956 A CN113829956 A CN 113829956A
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China
Prior art keywords
battery pack
switch
driving motor
state
transition
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Granted
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CN202010591851.3A
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Chinese (zh)
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CN113829956B (en
Inventor
康飞
杨怡
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BYD Co Ltd
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BYD Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
    • B60L50/61—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The disclosure relates to a driving system for a vehicle, a control method of the driving system and the vehicle. The driving system comprises a first battery pack, a second battery pack, a first change-over switch, a second change-over switch, a first transition switch, a second transition switch, a power supply device and a driving motor, wherein the power supply device is used for charging the first battery pack and the second battery pack, the power supply device is connected with the first battery pack and the second battery pack through the first change-over switch, the first battery pack and the second battery pack are further connected with the driving motor through the second change-over switch, the first change-over switch is used for enabling the power supply device to be switched between a state of being connected with the first battery pack and a state of being connected with the second battery pack, the first battery pack is further connected with the driving motor through the first transition switch, and the second battery pack is further connected with the driving motor through the second change-over switch. Therefore, the vehicle runs well continuously, and the transition switch is arranged, so that the power of the whole vehicle is uninterrupted in the battery pack switching process.

Description

Drive system for vehicle, control method of drive system and vehicle
Technical Field
The disclosure relates to the field of vehicle control, in particular to a driving system for a vehicle, a control method of the driving system and the vehicle.
Background
In the current electric vehicle or hybrid vehicle, a power battery is mounted, and a drive system of the vehicle is designed based on the power battery so that the drive system can drive the vehicle to run efficiently.
Because of the nature of the battery, the battery can only be in a charging or discharging state, i.e. only one of the charging or discharging state can be selected, and the charging and discharging state cannot be simultaneously selected. When the electric quantity of the power battery is low, the power battery needs to be charged, and if the power battery needs to drive a vehicle, the power battery needs to be discharged, which is a contradiction problem.
In some hybrid vehicles, when the electric quantity of the power battery is low, the engine is used for driving the vehicle while charging the power battery, which results in the reduction of the power performance of the vehicle, the increase of noise, and the poor riding and driving experience.
Disclosure of Invention
The invention aims to provide a driving system with good driving performance for a vehicle, a control method of the driving system and the vehicle.
To achieve the above object, the present disclosure provides a drive system for a vehicle. The driving system comprises a first battery pack, a second battery pack, a first change-over switch, a second change-over switch, a first transition switch, a second transition switch, a power supply device and a driving motor, wherein the power supply device is used for charging the first battery pack and the second battery pack, the driving motor is used for driving the vehicle to run,
the power supply device is connected with the first battery pack and the second battery pack through the first change-over switch, the first battery pack and the second battery pack are also connected with the driving motor through the second change-over switch, the first change-over switch is used for enabling the power supply device to be changed between a state of being connected with the first battery pack and a state of being connected with the second battery pack, the second change-over switch is used for enabling the driving motor to be changed between a state of being connected with the first battery pack and a state of being connected with the second battery pack,
the first battery pack is further connected with the driving motor through the first transition switch, and the second battery pack is further connected with the driving motor through the second transition switch.
Optionally, the driving system further includes a battery management system, the battery management system is connected to the first change-over switch, the second change-over switch, the first transition switch and the second transition switch, respectively, and the battery management system is configured to control the on/off of the first change-over switch, the second change-over switch, the first transition switch and the second transition switch.
Optionally, the power supply device is a generator, the driving system further includes an engine and a rectifier connected to the generator, and the engine, the generator, the rectifier and the first transfer switch are connected in sequence.
Optionally, the power supply device is a solar charging assembly.
The present disclosure also provides a control method for a drive system of a vehicle, applied to the drive system provided by the present disclosure, the method including:
acquiring the charge state of the first battery pack and the charge state of the second battery pack;
and controlling one or more of a first transition switch and a second transition switch, a first change-over switch and a second change-over switch to be opened and closed according to the charge state of the first battery pack and the charge state of the second battery pack so as to enable the first battery pack and the second battery pack to change the charge and discharge states.
Optionally, controlling one or more of a first transition switch and a second transition switch, a first change-over switch and a second change-over switch to open and close according to the state of charge of the first battery pack and the state of charge of the second battery pack, so that the first battery pack and the second battery pack change charge and discharge states, including:
if the state of charge of the first battery pack is smaller than a preset first threshold value, the state of charge of the second battery pack is larger than the first threshold value, and the first battery pack supplies power to the driving motor, the on-off of one or more of the first transition switch and the second transition switch and the on-off of the second change-over switch are controlled, so that the second battery pack supplies power to the driving motor, and the first change-over switch is controlled to be closed, so that a power supply device charges the first battery pack.
Optionally, controlling the opening and closing of one or more of the first transition switch and the second transition switch and controlling the opening and closing of the second transfer switch to cause the second battery pack to supply power to the driving motor includes:
the first transition switch is controlled to be closed firstly, then the second change-over switch is switched to a state of disconnecting the first battery pack and the driving motor and connecting the second battery pack and the driving motor, and then the first transition switch is disconnected,
alternatively, the first and second electrodes may be,
the second transition switch is controlled to be closed firstly, then the second change-over switch is switched to a state of disconnecting the first battery pack and the driving motor and connecting the second battery pack and the driving motor, and then the second transition switch is disconnected,
alternatively, the first and second electrodes may be,
the control is firstly to close the first transition switch and the second transition switch, then to convert the second change-over switch into the state of disconnecting the first battery pack and the driving motor and connecting the second battery pack and the driving motor, and then to disconnect the first transition switch and the second transition switch.
Optionally, controlling one or more of a first transition switch and a second transition switch, a first change-over switch and a second change-over switch to open and close according to the state of charge of the first battery pack and the state of charge of the second battery pack, so that the first battery pack and the second battery pack change charge and discharge states, including:
if a power supply device is charging the first battery pack, the state of charge of the first battery pack is greater than a predetermined second threshold value, the second battery pack is supplying power to a driving motor, and the state of charge of the second battery pack is greater than a predetermined first threshold value, controlling the opening and closing of one or more of the first transition switch and the second transition switch, the first change-over switch and the second change-over switch so that the power supply device stops charging the first battery pack and the first battery pack supplies power to the driving motor,
alternatively, the first and second electrodes may be,
if a power supply device is charging the first battery pack, the state of charge of the first battery pack is greater than a predetermined second threshold value, the second battery pack is supplying power to a driving motor, and the state of charge of the second battery pack is greater than a predetermined first threshold value, controlling the on/off of one or more of the first transition switch and the second transition switch, the first change-over switch and the second change-over switch so that the power supply device stops charging the first battery pack, and switching to supply power to the driving motor from the first battery pack until the state of charge of the second battery pack is less than the first threshold value, wherein the power supply device charges the second battery pack,
wherein the second threshold is greater than the first threshold.
Optionally, the method further comprises:
and when the vehicle is powered on, controlling the battery pack which is powered on last time of vehicle power failure in the first battery pack and the second battery pack to continuously supply power to the driving motor.
The present disclosure also provides a vehicle including the above-mentioned drive system provided by the present disclosure, or including a processor for executing the steps of the above-mentioned control method provided by the present disclosure.
Through above-mentioned technical scheme, can control the switching of each switch, realize when a group battery charges, another group battery is for the vehicle power supply, and like this, the continuity of vehicle operation is better. And because the first transition switch and the second transition switch are arranged, the whole vehicle power can be controlled to be uninterrupted in the process of switching between the two battery packs for supplying power to the vehicle, so that the running safety of the vehicle is guaranteed, and the driving and riding experience is better.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a block diagram of a drive system for a vehicle provided in an exemplary embodiment;
FIG. 2 is a block diagram of a drive system for a vehicle provided in another exemplary embodiment;
FIG. 3 is a schematic block diagram of a drive system for a vehicle provided in an exemplary embodiment;
FIG. 4 is a flowchart of a control method for a drive system of a vehicle provided by an exemplary embodiment;
FIG. 5 is a flowchart of a control method for a drive system of a vehicle provided by another exemplary embodiment;
FIG. 6 is a flowchart of a control method for a drive system of a vehicle provided in yet another exemplary embodiment;
FIG. 7 is a flowchart of a control method for a drive system of a vehicle provided in yet another exemplary embodiment;
FIG. 8 is a flowchart of a control method for a drive system of a vehicle provided in yet another exemplary embodiment;
FIG. 9 is a flowchart of a control method for a drive system of a vehicle provided in yet another exemplary embodiment;
FIG. 10 is a flowchart of a control method for a drive system of a vehicle provided in yet another exemplary embodiment;
fig. 11 is a flowchart of a control method for a drive system of a vehicle according to yet another example embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a block diagram of a drive system for a vehicle according to an exemplary embodiment. As shown in fig. 1, the driving system includes a first battery pack 10, a second battery pack 20, a first changeover switch 30, a second changeover switch 40, a first changeover switch 50, a second changeover switch 60, a power supply device 70, and a driving motor 80. The power supply device 70 is used for charging the first battery pack 10 and the second battery pack 20, and the driving motor 80 is used for driving the vehicle to run.
The power supply device 70 is connected to the first battery pack 10 and the second battery pack 20 through the first transfer switch 30, and the first battery pack 10 and the second battery pack 20 are also connected to the driving motor 80 through the second transfer switch 40. The first changeover switch 30 is used to change over the power supply device 70 between a state of being connected to the first battery pack 10 and a state of being connected to the second battery pack 20, and the second changeover switch 40 is used to change over the drive motor 80 between a state of being connected to the first battery pack 10 and a state of being connected to the second battery pack 20.
The first battery pack 10 is also connected to the driving motor 80 through a first transition switch 50, and the second battery pack 20 is also connected to the driving motor 80 through a second transition switch 60.
The first battery pack 10 and the second battery pack 20 may be the same battery pack or different battery packs. The first transfer switch 30, the second transfer switch 40, the first transition switch 50, and the second transition switch 60 may be mechanical relays, or solid state relays, or Insulated Gate Bipolar Transistors (IGBTs).
When one of the first battery pack 10 and the second battery pack 20 supplies power to the driving motor 80, the other one can be charged by the power supply device 70, which ensures that the vehicle does not stop running due to insufficient battery power.
When the drive motor 80 is switched between connection with the first battery pack 10 and connection with the second battery pack 20, if the switching is performed only by the second changeover switch 40, there is a possibility that the power of the vehicle may be temporarily interrupted. In the present disclosure, the first battery pack 10 is also connected to the driving motor 80 through the first transition switch 50 alone, and the second battery pack 20 is also connected to the driving motor 80 through the second transition switch 60 alone. Thus, when the first battery pack 10 and the second battery pack 20 are used as power sources for conversion, the first transition switch 50 and/or the second transition switch 60 are controlled to be switched on, so that in the process of converting the second conversion switch 40, the driving motor 80 can control the second conversion switch 40 to be switched on under the condition that the first battery pack 10 (through the first transition switch 50) and/or the second battery pack 20 (through the second transition switch 60) continuously supply power through the transition switches, and the uninterrupted power of the whole vehicle is ensured, thereby ensuring the safety of vehicle operation and ensuring better driving and riding experience.
Fig. 2 is a block diagram of a drive system for a vehicle according to another exemplary embodiment. Fig. 3 is a schematic structural diagram of a drive system for a vehicle according to an exemplary embodiment. As shown in fig. 2 and 3, the power supply device 70 may be a generator on the basis of fig. 1, and the driving system may further include an engine 100 and a rectifier 90 connected to the generator. The engine 100, the generator, the rectifier 90, and the first changeover switch 30 are connected in this order.
The engine 100 is used for providing mechanical energy for the generator so that the generator converts the mechanical energy into electric energy, and the rectifier 90 is used for converting the alternating current output by the generator into direct current and then supplying power to the first battery pack 10 and the second battery pack 20 through the first transfer switch 30.
The driving motor 80, the first transition switch 50, the second change-over switch 40, and the second transition switch 60 may be connected to a motor controller 120, and the motor controller 120 is configured to convert dc power into ac power and input the ac power to the driving motor 80. The output end of the driving motor 80 can be connected to the gearbox 130, and the driving motor 80 drives the wheels 140a and 140b to operate through the gearbox 130.
In this embodiment, the engine 100 of the vehicle can provide a power source for the power supply device 70, and provide a guarantee for the electric quantity of the first battery pack 10 and the second battery pack 20, if necessary.
Also, the engine 100 may be coupled to a transmission 130 in a vehicle. In this way, when the first battery pack 10 and the second battery pack 20 cannot supply power due to a fault, the vehicle can be directly driven by the engine 100.
The driving System may further include a Battery Management System (BMS) 110, the BMS 110 being connected to the first transfer switch 30, the second transfer switch 40, the first transition switch 50, and the second transition switch 60, respectively (connections to the second transfer switch 40 and the second transition switch 60 are not shown), the BMS 110 being configured to control the opening and closing of the first transfer switch 30, the second transfer switch 40, the first transition switch 50, and the second transition switch 60. BMS 110 is also connected to engine 100, rectifier 90, first battery pack 10, and second battery pack 20, respectively.
In some embodiments, as shown in fig. 3, the first transfer switch 30 and the second transfer switch 40 may be multi-contact switches. For example, the first transfer switch 30 may include a first stationary contact (a contact on the left side of the first transfer switch 30 in fig. 3), a first movable contact (a contact on the upper right of the first transfer switch 30 in fig. 3), and a second movable contact (a contact on the lower right of the first transfer switch 30 in fig. 3). The first stationary contact is connected to the power supply unit 70 via a rectifier 90, the first movable contact is connected to the first battery pack 10, and the second movable contact is connected to the second battery pack 20. The first stationary contact is connected to only one of the first movable contact and the second movable contact at a time. The power supply device 70 is connected to the first battery pack 10 when the first stationary contact is connected to the first movable contact, and the power supply device 70 is connected to the second battery pack 20 when the first stationary contact is connected to the second movable contact. The first fixed contact is directly switched to be connected with the second movable contact by being connected with the first movable contact.
As another example, the second transfer switch 40 may include a second stationary contact (the right contact of the second transfer switch 40 in fig. 3), a third movable contact (the upper left contact of the second transfer switch 40 in fig. 3), and a fourth movable contact (the lower left contact of the second transfer switch 40 in fig. 3). The second stationary contact is connected to the driving motor 80 through the motor controller 120, the third movable contact is connected to the first battery pack 10, and the fourth movable contact is connected to the second battery pack 20. The second fixed contact is connected with only one of the third movable contact and the fourth movable contact at the same time. The driving motor 80 is connected to the first battery pack 10 when the second stationary contact is connected to the third movable contact, and the driving motor 80 is connected to the second battery pack 20 when the second stationary contact is connected to the fourth movable contact. The second fixed contact is directly switched to be connected with the fourth movable contact by being connected with the third movable contact.
In fig. 3, a broken line indicates a transmission path of an electric signal, a thin solid line indicates a transmission path of electric energy, and a thick solid line indicates a transmission path of mechanical energy.
In addition, the power supply device 70 may also be a solar charging assembly, and in this embodiment, the driving system may also be applied to a rail vehicle powered by the solar charging assembly.
The present disclosure also provides a control method for the above-mentioned driving system. Fig. 4 is a flowchart of a control method for a drive system of a vehicle according to an exemplary embodiment. As shown in fig. 4, the method may include the steps of:
step S11, the state of charge of the first battery pack and the state of charge of the second battery pack are acquired.
And step S12, controlling one or more of the first transition switch and the second transition switch, the first change-over switch and the second change-over switch to be opened or closed according to the charge state of the first battery pack and the charge state of the second battery pack, so that the first battery pack and the second battery pack change the charge-discharge state.
The control method may be controlled by the BMS 110 of the vehicle. The first battery pack 10 or the second battery pack 20 is in a charged state when connected to the power supply device 70 and in a discharged state when connected to the drive motor 80.
As described above, when the first battery pack 10 and the second battery pack 20 are used as power sources to be switched, the first transition switch 50 and/or the second transition switch 60 are controlled to be turned on, so that in the process of switching the second switch 40, the second switch 40 is controlled to be switched under the condition that the driving motor 80 can be continuously supplied with power by the first battery pack 10 and/or the second battery pack 20 through the transition switches, and the uninterrupted power of the whole vehicle is ensured, thereby ensuring the safety of vehicle operation and ensuring better driving and riding experience. The state of charge of the first battery pack 10 and the state of charge of the second battery pack 20 may be used as a basis for determining whether to perform charging or discharging.
Through above-mentioned technical scheme, can control the switching of each switch, when realizing that a group battery charges, another group battery is the vehicle power supply, and like this, the continuity of vehicle operation is better. And because the first transition switch and the second transition switch are arranged, the whole vehicle power can be controlled to be uninterrupted in the process of switching between the two battery packs for supplying power to the vehicle, so that the running safety of the vehicle is guaranteed, and the driving and riding experience is better.
In some embodiments, as shown in fig. 5, the step of controlling the opening and closing of one or more of the first transition switch and the second transition switch, the first transfer switch and the second transfer switch according to the state of charge of the first battery pack and the state of charge of the second battery pack on the basis of fig. 4 so that the first battery pack and the second battery pack change the charging and discharging states (step S12) may include step S121:
step S121, if the state of charge of the first battery pack is smaller than a predetermined first threshold, the state of charge of the second battery pack is greater than the first threshold, and the first battery pack is supplying power to the driving motor, controlling the on/off of one or more of the first transition switch and the second transition switch, and controlling the on/off of the second transfer switch, so that the second battery pack supplies power to the driving motor, and controlling the on/off of the first transfer switch, so that the power supply device charges the first battery pack.
If the state of charge of the first battery pack 10 is smaller than the predetermined first threshold, it may be determined that the electric quantity of the first battery pack 10 has reached a smaller level and needs to be charged. Similarly, if the state of charge of the first battery pack 20 is less than the predetermined first threshold, it may be determined that the charge of the first battery pack 20 has reached a smaller level and needs to be charged.
That is, if the first battery pack 10 that is supplying power to the drive motor 80 needs to be charged and the first battery pack 20 can be used for supplying power, the power supply battery pack of the vehicle is converted from the first battery pack 10 to the first battery pack 20. In this way, it is ensured that the quantity of electricity of the battery pack supplying electricity to the vehicle is greater than the predetermined first threshold value, ensuring the continuity of the operation of the vehicle. Wherein the predetermined first threshold value may be obtained experimentally or empirically.
Fig. 6 is a flowchart of a control method for a drive system of a vehicle according to yet another exemplary embodiment. As shown in fig. 6, on the basis of fig. 5, controlling one or more of the first transition switch and the second transition switch and opening and closing of the second transfer switch so that the second battery pack supplies power to the driving motor in step S121 may include:
the control is firstly to close the first transition switch, then to convert the second change-over switch into the state of disconnecting the first battery pack and the driving motor, connecting the second battery pack and the driving motor, and then to disconnect the first transition switch.
That is, in the embodiment of fig. 6, step S121 may include step S1211 on the basis of fig. 5.
Step S1211, if the state of charge of the first battery pack is smaller than a predetermined first threshold, the state of charge of the second battery pack is greater than the first threshold, and the first battery pack is supplying power to the driving motor, the first transition switch is first turned on, the second transition switch is then switched to a state where the first battery pack and the driving motor are disconnected and the second battery pack and the driving motor are connected, the first transition switch is then turned off, the first transition switch is controlled to be turned on and off, so that the power supply device is connected to the first battery pack, and the power supply device charges the first battery pack.
In this embodiment, when the first battery pack 10 supplies power to the driving motor 80 only through the second changeover switch 40, the first transition switch 50 is closed, and at this time, the driving motor 80 communicates with the first battery pack 10 through two paths of the first transition switch 50 and the second changeover switch 40. In the process of switching the second changeover switch 40 from communicating the drive motor 80 with the first battery pack 10 to communicating the drive motor 80 with the second battery pack 20, even if the drive motor 80 does not communicate with either of the first battery pack 10 and the second battery pack 20 through the second changeover switch 40 for a short time, the drive motor 80 is supplied with power from the first battery pack 10 through at least the first changeover switch 50, and therefore, the vehicle is not briefly powered off. After determining that the driving motor 80 has been communicated with the second battery pack 20 through the second transfer switch 40, the first transition switch 50 is turned off again, so that the driving motor 80 is completely powered by the second battery pack 20 through the second transfer switch 40.
Fig. 7 is a flowchart of a control method for a drive system of a vehicle according to yet another exemplary embodiment. As shown in fig. 7, on the basis of fig. 5, the controlling of one or more of the first transition switch and the second transition switch and the opening and closing of the second transfer switch so that the second battery pack supplies power to the driving motor in step S121 may include:
the control firstly closes the second transition switch, then converts the second change-over switch into the state of disconnecting the first battery pack and the driving motor and connecting the second battery pack and the driving motor, and then disconnects the second transition switch.
That is, in the embodiment of fig. 7, step S121 may include step S1212 on the basis of fig. 5.
Step S1212, if the state of charge of the first battery pack is smaller than the predetermined first threshold, the state of charge of the second battery pack is greater than the first threshold, and the first battery pack is supplying power to the driving motor, first closing the second transition switch, switching the second transfer switch to a state of disconnecting the first battery pack from the driving motor, and connecting the second battery pack to the driving motor, and then disconnecting the second transition switch, and controlling the first transfer switch to be closed, so that the power supply device is connected to the first battery pack, and the power supply device charges the first battery pack.
In this embodiment, when the first battery pack 10 supplies power to the driving motor 80 only through the second changeover switch 40, the second transition switch 60 is closed, and at this time, the driving motor 80 communicates with the second battery pack 10 through the second transition switch 60. In the process of switching the second changeover switch 40 from communicating the drive motor 80 with the first battery pack 10 to communicating the drive motor 80 with the second battery pack 20, even if the drive motor 80 does not communicate with either of the first battery pack 10 and the second battery pack 20 through the second changeover switch 40 for a short time, the drive motor 80 is supplied with power from the second battery pack 20 through at least the second changeover switch 60, and therefore, the vehicle is not briefly powered off. After determining that the driving motor 80 has been communicated with the second battery pack 20 through the second transfer switch 40, the second transition switch 60 is turned off again, so that the driving motor 80 is completely powered by the second battery pack 20 through the second transfer switch 40.
Fig. 8 is a flowchart of a control method for a drive system of a vehicle according to yet another exemplary embodiment. As shown in fig. 8, on the basis of fig. 5, controlling one or more of the first transition switch and the second transition switch and opening and closing of the second transfer switch so that the second battery pack supplies power to the driving motor in step S121 may include:
the control firstly closes the first transition switch and the second transition switch, then converts the second change-over switch into the state of disconnecting the first battery pack and the driving motor and connecting the second battery pack and the driving motor, and then disconnects the first transition switch and the second transition switch.
That is, in the embodiment of fig. 8, step S121 may include step S1213 on the basis of fig. 5.
Step S1213, if the state of charge of the first battery pack is less than the predetermined first threshold, the state of charge of the second battery pack is greater than the first threshold, and the first battery pack is supplying power to the driving motor, the first transition switch and the second transition switch are controlled to be turned on first, the second transfer switch is then switched to a state of disconnecting the first battery pack and the driving motor, and connecting the second battery pack and the driving motor, and then the first transition switch and the second transition switch are turned off, and the first transition switch is controlled to be turned on and off, so that the power supply device is connected to the first battery pack, and the power supply device charges the first battery pack.
In this embodiment, when the second changeover switch 40 is changed over, both the first changeover switch 50 and the second changeover switch 60 are closed, and at this time, the drive motor 80 communicates with the first battery pack 10 through the first changeover switch 50 and communicates with the second battery pack 20 through the second changeover switch 60. During the switching of the second changeover switch 40, even if the driving motor 80 is not communicated with any one of the first battery pack 10 and the second battery pack 20 through the second changeover switch 40 for a short time, the driving motor 80 is supplied with power from the first battery pack 10 and the second battery pack 20 through the first changeover switch 50 and the second changeover switch 60, respectively, and thus, the vehicle is not briefly powered off. After determining that the driving motor 80 has been communicated with the second battery pack 20 through the second transfer switch 40, the first and second transition switches 50 and 60 are turned off to allow the driving motor 80 to be completely powered by the second battery pack 20 through the second transfer switch 40.
In summary, during the switching process of the second switch 40, either one or both of the first transition switch 50 and the second transition switch 60 are closed, so that the driving motor 80 is connected to at least one battery pack through at least one transition switch other than the second switch 40, thereby avoiding a short interruption of power caused by the switching action of the second switch 40.
Fig. 9 is a flowchart of a control method for a drive system of a vehicle according to yet another exemplary embodiment. As shown in fig. 9, the step of controlling the opening and closing of one or more of the first and second transition switches, the first and second transfer switches according to the state of charge of the first battery pack and the state of charge of the second battery pack on the basis of fig. 4 so that the first and second battery packs change the charge and discharge states (step S12) may include step S122.
Step S122, if the power supply device is charging the first battery pack, the state of charge of the first battery pack is greater than a predetermined second threshold, the second battery pack is supplying power to the driving motor, and the state of charge of the second battery pack is greater than a predetermined first threshold, controlling one or more of the first transition switch and the second transition switch, the first change-over switch, and the second change-over switch to be turned on and off, so that the power supply device stops charging the first battery pack, and the first battery pack supplies power to the driving motor. Wherein the second threshold is greater than the first threshold.
If the state of charge of a battery pack is greater than the predetermined second threshold, it may be determined that the electric quantity of the battery pack has reached a certain level, that is, the upper limit of charging is reached, and at this time, the battery pack may be controlled to end charging.
In this embodiment, when the battery pack in the charging state reaches the upper charging limit and the other battery pack does not reach the level to be charged, the battery pack can still be discharged for a period of time, and at this time, the battery can be switched to discharge the originally charged battery pack, and the other battery pack may or may not be charged.
Specifically, since the state of charge of the first battery pack 10 being charged is greater than the second threshold, at which the upper charging limit has been reached, and the state of charge of the first battery pack 20 being supplied with power to the drive motor 80 is greater than the predetermined first threshold, at which the level to be charged has not been reached, at which time, the above-described switch may be controlled, the charging of the first battery pack 10 is stopped, and the transition is made such that the drive motor 80 is supplied with power from the first battery pack 10.
At the same time, the first battery pack 20 may be controlled to be charged. Alternatively, the first battery pack 20 may not be charged first, the remaining charging time of the first battery pack 20 is estimated, and the time for starting charging the first battery pack 20 is determined according to the remaining charging time and the remaining capacity of the first battery pack 10, so that the charging of the first battery pack 20 can be ended before the remaining capacity of the first battery pack 10 falls to the first threshold.
The specific switching control method may be performed with reference to the switching strategy in the above embodiment. For example, the control first closes the first transition switch 50, then switches the second switch 40 to a state where the first battery pack 20 and the driving motor 80 are disconnected, and the first battery pack 10 and the driving motor 80 are connected, and then switches the first transition switch 50 off.
In the embodiment, the battery pack is switched to be used for driving the vehicle when the battery pack is fully charged every time, so that the driving performance of the vehicle is ensured to be strong.
Fig. 10 is a flowchart of a control method for a drive system of a vehicle according to yet another exemplary embodiment. As shown in fig. 10, the step of controlling the opening and closing of one or more of the first and second transition switches, the first and second transfer switches, so that the first and second battery packs change the charge and discharge states (step S12) may include step S123, based on fig. 4, according to the charge states of the first and second battery packs.
Step S123, if the power supply device is charging the first battery pack, the state of charge of the first battery pack is greater than a predetermined second threshold, the second battery pack is supplying power to the driving motor, and the state of charge of the second battery pack is greater than a predetermined first threshold, controlling one or more of the first transition switch and the second transition switch, the first transfer switch, and the second transfer switch to be turned on and off, so that the power supply device stops charging the first battery pack, and until the state of charge of the second battery pack is less than the first threshold, the first battery pack supplies power to the driving motor, and the power supply device charges the second battery pack. Wherein the second threshold is greater than the first threshold.
That is, the first battery pack 20 is driven as long as the first battery pack 20 does not need to be charged, and if the charge of the first battery pack 10 reaches the upper limit, the charge is stopped first, and when the first battery pack 20 needs to be charged, the first battery pack 20 is driven by the first battery pack 10 and charged.
In the embodiment, the situation that the electric quantity of the two battery packs is less is avoided, and the continuity of vehicle operation is guaranteed.
Fig. 11 is a flowchart of a control method for a drive system of a vehicle according to yet another example embodiment. As shown in fig. 11, on the basis of fig. 4, the method may further include step S13.
And step S13, when the vehicle is powered on, controlling the battery pack which is powered on last time when the vehicle is powered off in the first battery pack and the second battery pack to continuously supply power for the driving motor.
That is, if the vehicle stops operating when the first battery pack 10 supplies power to the vehicle, the power supply of the first battery pack 10 is continuously controlled when the vehicle is powered on next time, so that the control strategy in the last power-on operation process can be continued, the control is simple, and errors are not easy to occur. The vehicle power-on operation may be a state in which the vehicle is powered off from the vehicle to start operating the driving motor 80.
The present disclosure also provides a vehicle including the above-mentioned drive system provided by the present disclosure, or including a processor for executing the steps of the above-mentioned control method provided by the present disclosure.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A driving system for a vehicle, which is characterized by comprising a first battery pack, a second battery pack, a first change-over switch, a second change-over switch, a first transition switch, a second transition switch, a power supply device and a driving motor, wherein the power supply device is used for charging the first battery pack and the second battery pack, the driving motor is used for driving the vehicle to run,
the power supply device is connected with the first battery pack and the second battery pack through the first change-over switch, the first battery pack and the second battery pack are also connected with the driving motor through the second change-over switch, the first change-over switch is used for enabling the power supply device to be changed between a state of being connected with the first battery pack and a state of being connected with the second battery pack, the second change-over switch is used for enabling the driving motor to be changed between a state of being connected with the first battery pack and a state of being connected with the second battery pack,
the first battery pack is further connected with the driving motor through the first transition switch, and the second battery pack is further connected with the driving motor through the second transition switch.
2. The drive system according to claim 1, further comprising a battery management system, the battery management system being connected to the first transfer switch, the second transfer switch, the first transition switch, and the second transition switch, respectively, and the battery management system being configured to control opening and closing of the first transfer switch, the second transfer switch, the first transition switch, and the second transition switch.
3. The drive system of claim 1, wherein the power supply device is a generator, the drive system further comprising a motor and a rectifier connected to the generator, the motor, the generator, the rectifier and the first transfer switch being connected in series.
4. The drive system of claim 1, wherein the power supply device is a solar charging assembly.
5. A control method for a drive system of a vehicle, applied to the drive system of any one of claims 1 to 4, characterized by comprising:
acquiring the charge state of the first battery pack and the charge state of the second battery pack;
and controlling one or more of a first transition switch and a second transition switch, a first change-over switch and a second change-over switch to be opened and closed according to the charge state of the first battery pack and the charge state of the second battery pack so as to enable the first battery pack and the second battery pack to change the charge and discharge states.
6. The method of claim 5, wherein controlling the opening and closing of one or more of a first transition switch and a second transition switch, a first transfer switch and a second transfer switch to cause the first battery pack and the second battery pack to change charge and discharge states according to the state of charge of the first battery pack and the state of charge of the second battery pack comprises:
if the state of charge of the first battery pack is smaller than a preset first threshold value, the state of charge of the second battery pack is larger than the first threshold value, and the first battery pack supplies power to the driving motor, the on-off of one or more of the first transition switch and the second transition switch and the on-off of the second change-over switch are controlled, so that the second battery pack supplies power to the driving motor, and the first change-over switch is controlled to be closed, so that a power supply device charges the first battery pack.
7. The method of claim 6, wherein controlling opening and closing of one or more of the first transition switch and the second transition switch and controlling opening and closing of the second transfer switch to cause the second battery pack to power the drive motor comprises:
the first transition switch is controlled to be closed firstly, then the second change-over switch is switched to a state of disconnecting the first battery pack and the driving motor and connecting the second battery pack and the driving motor, and then the first transition switch is disconnected,
alternatively, the first and second electrodes may be,
the second transition switch is controlled to be closed firstly, then the second change-over switch is switched to a state of disconnecting the first battery pack and the driving motor and connecting the second battery pack and the driving motor, and then the second transition switch is disconnected,
alternatively, the first and second electrodes may be,
the control is firstly to close the first transition switch and the second transition switch, then to convert the second change-over switch into the state of disconnecting the first battery pack and the driving motor and connecting the second battery pack and the driving motor, and then to disconnect the first transition switch and the second transition switch.
8. The method of claim 5, wherein controlling the opening and closing of one or more of a first transition switch and a second transition switch, a first transfer switch and a second transfer switch to cause the first battery pack and the second battery pack to change charge and discharge states according to the state of charge of the first battery pack and the state of charge of the second battery pack comprises:
if a power supply device is charging the first battery pack, the state of charge of the first battery pack is greater than a predetermined second threshold value, the second battery pack is supplying power to a driving motor, and the state of charge of the second battery pack is greater than a predetermined first threshold value, controlling the opening and closing of one or more of the first transition switch and the second transition switch, the first change-over switch and the second change-over switch so that the power supply device stops charging the first battery pack and the first battery pack supplies power to the driving motor,
alternatively, the first and second electrodes may be,
if a power supply device is charging the first battery pack, the state of charge of the first battery pack is greater than a predetermined second threshold value, the second battery pack is supplying power to a driving motor, and the state of charge of the second battery pack is greater than a predetermined first threshold value, controlling the on/off of one or more of the first transition switch and the second transition switch, the first change-over switch and the second change-over switch so that the power supply device stops charging the first battery pack, and switching to supply power to the driving motor from the first battery pack until the state of charge of the second battery pack is less than the first threshold value, wherein the power supply device charges the second battery pack,
wherein the second threshold is greater than the first threshold.
9. The method according to any one of claims 5-8, further comprising:
and when the vehicle is powered on, controlling the battery pack which is powered on last time of vehicle power failure in the first battery pack and the second battery pack to continuously supply power to the driving motor.
10. A vehicle comprising a drive system according to any of claims 1-4 or comprising a processor for performing the steps of a control method according to any of claims 5-9.
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