CN114379382B - Double-power-system passenger car and charging method thereof - Google Patents
Double-power-system passenger car and charging method thereof Download PDFInfo
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- CN114379382B CN114379382B CN202011111175.1A CN202011111175A CN114379382B CN 114379382 B CN114379382 B CN 114379382B CN 202011111175 A CN202011111175 A CN 202011111175A CN 114379382 B CN114379382 B CN 114379382B
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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
- 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
-
- 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
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/14—Conductive energy transfer
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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]
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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
- B60L58/18—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
- B60L58/22—Balancing the charge of battery modules
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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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
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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
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
- B60L2240/547—Voltage
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- 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
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- 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
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The invention relates to a double-power system passenger car and a charging method thereof, and belongs to the technical field of new energy passenger car charging. The charging method comprises the following steps: acquiring electric quantity and voltage of the first power battery pack and the second power battery pack; comparing the electric quantity of the first power battery pack with that of the second power battery pack; if the electric quantity difference between the first power battery pack and the second power battery pack is larger than or equal to a set threshold value, controlling the power battery pack with lower electric quantity to carry out external charging; until the electric quantity difference of the two power battery packs is smaller than a set threshold value; when the electric quantity difference of the two power battery packs is smaller than a set threshold value, if the voltages of the first power battery pack and the second power battery pack are unequal, starting bidirectional DCDC between the two power battery packs to perform voltage equalization; when the voltages of the two power battery packs are equal, the bidirectional DCDC is turned off, and the two power battery packs are simultaneously and externally charged. The invention realizes the reliability of simultaneous charging of two power battery packs and improves the charging efficiency.
Description
Technical Field
The invention relates to a double-power system passenger car and a charging method thereof, and belongs to the technical field of new energy passenger car charging.
Background
Along with the continuous aggravation of environmental pollution and energy problems, people demand public transportation travel increasingly more, and more cities start to set public transportation special lanes on the premise of increasing traffic pressure increasingly more. New energy buses of 18 meters and more are increasingly used for improving the transportation capacity of public transportation and the utilization rate of public transportation lanes.
Aiming at new energy buses of 18 meters and above, the existing single-power system scheme cannot meet the power performance requirement of the whole bus, so that various manufacturers release a power system scheme with multiple motors and multiple power supplies. However, since all the power systems are in one high-pressure system, the following problems exist in practical application:
1. high-pressure system components have high requirements and high production and manufacturing difficulties
The new energy passenger car with the power of 18 meters and more has large self-weight, large carrying capacity and long driving mileage, and more power batteries and driving motors with higher power are required to be installed. By adopting a single high-voltage system, the power battery can generate large charge and discharge current in the operation process, the requirements on the overcurrent capacity of the contactor, the fuse, the connector and the wire harness of the high-voltage component are higher, the requirements on the installation space and the wire harness trend are more strict, and the manufacturing cost are greatly increased.
2. High voltage system redundancy is low
Because only one high-voltage system has no corresponding backup and redundancy, the high-voltage system has no influence on steering, braking, running and the like of the vehicle after the high-voltage system fails, the high-voltage system directly breaks down when serious, causes special lane blockage and cannot well meet the rapid and efficient operation requirements.
3. Vehicle-mounted energy balance has problems
The high-capacity loading battery has the advantages that due to the limitation of working voltage, the battery cores are required to be used in parallel, multiple groups of battery cores are connected in parallel, the battery cores are easily influenced by consistency of battery monomers, and the output capacity and the service life of the vehicle-mounted energy source are further influenced.
4. Vehicle-mounted energy charging difficulty is high and convenience is poor
The high-capacity battery needs to be compatible with charging facilities and operation requirements during power supply, so that high-power charging equipment is required, impact is caused on a charging interface, charging connection and the like, and the problems of excessive equipment, high cost or insufficient utilization rate are easily caused.
5. The system is not convenient to install and maintain
The high-capacity battery and the high-power motor are connected by a whole vehicle, so that the modularization degree is low, and besides the production is inconvenient, the influence on the piezoelectric equipment or sensitive parts of the whole vehicle is easy.
For this purpose, dual power systems having completely independent operation processes are proposed to solve the above problems, and each independent power system is configured with an independent power battery pack, a charging interface, a battery management system BMS, a subsystem controller, and an integrated controller, and controls the corresponding execution device to operate. When each independent power battery pack is charged, a distributed charging mode is adopted, two power systems are charged independently, and the technical scheme of independent charging has the following defects:
1. the voltage balance between the batteries cannot be performed; and thus the charging equipment cannot be shared during simultaneous charging;
2. the charging device cannot be reused;
3. the rapid charging of single batteries by multiple charging devices cannot be realized;
4. the reasonable allocation space of the charging facilities is smaller;
5. the system is only applied through system stacking, so that the use and popularization cost is greatly increased.
Disclosure of Invention
The utility model aims to provide a double-power system passenger car and a charging method thereof, which are used for solving the problem of inconsistent charging of the existing double-power system.
In order to achieve the above purpose, the present application provides a technical scheme of a charging method for a dual-power system passenger car, which includes the following steps:
1) Acquiring electric quantity of the first power battery pack and the second power battery pack;
2) Comparing the electric quantity of the first power battery pack with that of the second power battery pack; if the electric quantity difference between the first power battery pack and the second power battery pack is larger than or equal to a set threshold value, controlling the power battery pack with lower electric quantity to carry out external charging; until the electric quantity difference of the two power battery packs is smaller than a set threshold value;
3) When the electric quantity difference of the two power battery packs is smaller than a set threshold value, acquiring the voltage of the first power battery pack and the voltage of the second power battery pack, and if the voltage of the first power battery pack and the voltage of the second power battery pack are unequal, starting bidirectional DCDC between the two power battery packs to perform voltage equalization;
4) When the voltages of the two power battery packs are equal, the bidirectional DCDC is turned off, and the two power battery packs are simultaneously and externally charged.
In addition, the application also provides a technical scheme of the double-power system passenger car, which comprises a passenger car body, a first power system and a second power system; the first power system comprises a first BMS, a first charging interface and a first power battery pack; the second driving system includes a second BMS, a second charging interface, a second power battery pack, and further includes:
the bidirectional DCDC is arranged between the first power battery pack and the second power battery pack;
the power distribution controller is in communication connection with the first BMS and the second BMS; the power distribution controller is in control connection with the bidirectional DCDC, the power distribution controller comprises a processor, a memory and a computer program which is stored in the memory and can run on the processor, and the technical scheme of the double-power-system bus charging method is realized when the processor executes the computer program.
The technical scheme of the double-power system passenger car and the charging method thereof has the advantages that: according to the invention, the electric quantity of the two power battery packs is compared, the power battery pack with low electric quantity is charged firstly, and then when the electric quantity difference of the two power battery packs is smaller than a set threshold value, the voltage of the two power battery packs is balanced by starting the bidirectional DCDC, and when the voltage of the two power battery packs is equal, the bidirectional DCDC is closed to charge the two power battery packs simultaneously. The invention realizes the reliability of simultaneous charging of two power battery packs and improves the charging efficiency.
Furthermore, in the double-power system passenger car and the charging method thereof, in order to meet the driving requirement under specific conditions, when one of the power battery packs needs to be charged quickly, the power battery pack is charged directly.
Furthermore, in the double-power system passenger car and the charging method thereof, in order to meet the driving requirement, when the electric quantity of one of the power battery packs is lower, the power battery pack with high electric quantity is controlled to be temporarily charged for the power battery pack with low electric quantity.
Furthermore, in the charging method of the double-power-system passenger car, the external charging mode is flexible and high in applicability, and the external charging comprises a pantograph socket collaborative charging mode, a single-pantograph charging mode, a single-socket charging mode or a double-socket charging mode.
Furthermore, in the dual-power system passenger car, in order to realize diversification of external charging modes and improve charging applicability, the dual-power system passenger car further comprises a pantograph and a pantograph charging circuit, and a first charging socket, a first charging socket charging circuit, a second charging socket and a second charging socket charging circuit; the pantograph is connected with the first charging interface and the second charging interface through a pantograph charging circuit; the first charging socket is connected with the first charging interface and the second charging interface through a first charging socket charging circuit; the second charging socket is connected with the first charging interface and the second charging interface through a second charging socket charging circuit.
Furthermore, in the double-power system passenger car, in order to better control each charging mode, a pantograph contactor is arranged on a pantograph charging circuit; the first charging socket charging circuit is provided with a first charging socket contactor; the second charging socket charging circuit is provided with a second charging socket contactor; the distribution controller is connected with each contactor in a control way.
Furthermore, in the dual-power system passenger car, in order to realize remote interaction, the dual-power system passenger car further comprises a vehicle-mounted monitoring system and a vehicle-mounted wireless terminal so as to realize information interaction with a service center.
Drawings
FIG. 1 is a schematic diagram of a dual power system passenger vehicle of the present invention;
FIG. 2 is a schematic circuit diagram of the power distribution management system of the present invention;
FIG. 3 is a flow chart of a method of charging a dual power system passenger vehicle of the present invention;
fig. 4 is a schematic diagram of the remote interaction of the dual power system passenger vehicle of the present invention.
Detailed Description
Dual power system bus embodiment:
the double-power-system passenger car is shown in fig. 1, and comprises a passenger car body, a first power system, a second power system, a power distribution management system, a pantograph, a first charging socket, a second charging socket, a bidirectional DCDC, a whole car controller, a gateway, a vehicle-mounted monitoring system and a wireless terminal.
The first power system comprises a first BMS, a first charging interface, a first power battery pack, a first subsystem controller, a first integrated controller, a first driving motor and a first electric accessory; the first charging interface is connected with the first power battery pack through the first BMS, and charges the first power battery pack through the first charging interface; the first integrated controller is connected with the first power battery pack through the first BMS to supply power for the first integrated controller through the first power battery pack, and the first integrated controller is controlled and connected with the first driving motor and the first electric accessory. The first integrated controller comprises a driving motor controller, a steering motor controller, an air compressor controller, a high-voltage power distribution unit and an insulation detection unit, so that the configuration, the management and the local fault diagnosis of a high-voltage system can be realized; the first BMS comprises a monitoring unit and an energy consumption statistics unit, and is used for monitoring data in the charging process of the first power battery pack and carrying out energy consumption statistics on the discharging process, the first integrated controller and the first BMS are in communication connection with a first subsystem controller, collected information is synchronously sent to the first subsystem controller through a CAN bus, the first subsystem controller sends the information to a whole vehicle controller through a gateway or to a vehicle-mounted monitoring system through the gateway, the information is sent to a central service station through a wireless terminal, information interaction with the central service station is achieved, and a supporting program is remotely updated through an independent information system.
The second power system comprises a second BMS, a second charging interface, a second power battery pack, a second subsystem controller, a second integrated controller, a second driving motor and a second electric accessory, and the connection relation of the second power system is identical to that of the first power system, and the second power system is not repeated here.
The second power system and the first power system are two sets of power systems which are independently operated, the two sets of power systems can be independently arranged, meanwhile, the modular design is carried out, the interfaces are unified, the sizes are unified, the support positions are randomly arranged, the high-voltage wiring difficulty caused by front and rear segmentation of vehicles when the vehicles are arranged above 18 meters can be avoided, and the abrasion condition of high-voltage and low-voltage wiring harnesses possibly caused by the operation of the vehicles is avoided.
The power distribution management system is shown in fig. 2, and comprises a power distribution controller and a power distribution circuit;
the power distribution circuit includes: the device comprises a first charging socket positive branch, a first charging socket negative branch, a pantograph positive branch, a pantograph negative branch, a second charging socket positive branch, a second charging socket negative branch, a total positive branch, a total negative branch, a first power battery positive branch, a first power battery negative branch, a second power battery positive branch, a second power battery negative branch, a bidirectional DCDC input positive branch, a bidirectional DCDC output positive branch, a bidirectional DCDC input negative branch and a bidirectional DCDC output negative branch;
the first charging socket positive branch, the first charging socket negative branch, the total positive branch, the total negative branch, the first power battery positive branch, the first power battery negative branch, the second power battery positive branch and the second power battery negative branch form a first charging socket charging circuit, and the two power batteries are charged through the first charging socket;
the pantograph positive branch, the pantograph negative branch, the total positive branch, the total negative branch, the first power battery positive branch, the first power battery negative branch, the second power battery positive branch and the second power battery negative branch form a pantograph charging circuit, and the two power batteries are charged through the pantograph;
the second charging socket positive branch, the second charging socket negative branch, the total positive branch, the total negative branch, the first power battery positive branch, the first power battery negative branch, the second power battery positive branch and the second power battery negative branch form a second charging socket charging circuit, and the two power batteries are charged through the second charging socket.
The specific connection relation is as follows:
one end of the positive pole branch of the first charging socket is connected with the positive pole of the first charging socket, and the other end of the positive pole branch is connected with the input end of the total positive pole branch;
one end of the negative pole branch of the first charging socket is connected with the negative pole of the first charging socket, and the other end of the negative pole branch of the first charging socket is connected with the input end of the total negative pole branch;
one end of the pantograph positive pole branch is connected with the positive pole of the pantograph, and the other end is connected with the input end of the total positive pole branch; a pantograph positive contactor K1 is arranged on the pantograph positive branch;
one end of the negative pole branch of the pantograph is connected with the negative pole of the pantograph, and the other end of the negative pole branch of the pantograph is connected with the input end of the total negative pole branch; a pantograph negative electrode contactor K2 is arranged on the pantograph negative electrode branch;
one end of the positive pole branch of the second charging socket is connected with the positive pole of the second charging socket, and the other end of the positive pole branch is connected with the input end of the total positive pole branch;
one end of the negative pole branch of the second charging socket is connected with the negative pole of the second charging socket, and the other end of the negative pole branch of the second charging socket is connected with the input end of the total negative pole branch;
one end of the positive pole branch of the first power battery pack is connected with the positive pole of the first charging interface, and the other end of the positive pole branch is connected with the output end of the total positive pole branch; the first power battery positive electrode branch is provided with a first power battery positive electrode contactor K3 and a first current sensor;
one end of the negative pole branch of the first power battery pack is connected with the negative pole of the first charging interface, and the other end of the negative pole branch is connected with the output end of the total negative pole branch; the first power battery pack negative electrode branch is provided with a first power battery pack negative electrode contactor K5;
one end of the positive pole branch of the second power battery pack is connected with the positive pole of the second charging interface, and the other end of the positive pole branch is connected with the output end of the total positive pole branch; the second power battery positive electrode branch is provided with a second power battery positive electrode contactor K4 and a second current sensor;
one end of the negative pole branch of the second power battery pack is connected with the negative pole of the second charging interface, and the other end of the negative pole branch is connected with the output end of the total negative pole branch; the second power battery pack negative electrode branch is provided with a second power battery pack negative electrode contactor K6;
one end of the bidirectional DCDC input positive pole branch is connected with the positive pole branch of the first power battery pack, and the other end of the bidirectional DCDC input positive pole is connected with the bidirectional DCDC input positive pole;
one end of the bidirectional DCDC output positive pole branch is connected with the positive pole branch of the second power battery pack, and the other end of the bidirectional DCDC output positive pole is connected with the bidirectional DCDC output positive pole;
one end of the bidirectional DCDC input negative pole branch is connected with the negative pole branch of the first power battery pack, and the other end of the bidirectional DCDC input negative pole branch is connected with the bidirectional DCDC input negative pole;
one end of the bidirectional DCDC output negative pole branch is connected with the negative pole branch of the second power battery pack, and the other end of the bidirectional DCDC output negative pole branch is connected with the bidirectional DCDC output negative pole;
the first current sensor and the second current sensor are connected with the input end of the power distribution controller, the output end of the power distribution controller is in control connection with each contactor and the bidirectional DCDC, the power distribution controller is in communication connection with the first BMS and the second BMS, the power distribution controller comprises a processor, a memory and a computer program which is stored in the memory and can run on the processor, and the processor realizes the charging method of the double-power-system bus when executing the computer program.
The charging method of the dual-power system bus is shown in fig. 3, and the charging method comprises a pantograph socket cooperative charging mode, a single-pantograph charging mode, a single-socket charging mode, a dual-socket charging mode, a quick charging mode and a temporary charging mode, wherein the pantograph socket cooperative charging mode comprises a charging mode of a pantograph cooperative with one charging socket and a charging mode of a cooperative two charging sockets. The pantograph is used for being connected with the charging pantograph so as to realize charging of the pantograph, and the charging socket is used for being connected with the inserting gun so as to realize charging of the charging socket.
The charging method of the pantograph and the two charging sockets are the same, and the method comprises the following steps:
1) After the pantograph is connected to the charging pantograph, the first charging socket and the second charging socket are respectively connected with the corresponding plug guns, the power distribution controller judges the connection condition of external charging equipment (namely the charging pantograph and the plug guns) through connection signal detection, and electric quantity and voltage of the first power battery pack and the second power battery pack are obtained through the first BMS and the second BMS;
2) The power distribution controller compares the electric quantity of the first power battery pack and the electric quantity of the second power battery pack, if the electric quantity difference of the first power battery pack and the second power battery pack is larger than or equal to a set threshold value and the electric quantity of the second power battery pack is detected to be low, the voltage of the external charging equipment is adjusted to be within a permissible range according to the voltage of the second power battery pack, then the positive contactor K4 and the negative contactor K6 of the second power battery pack and the positive contactor K1 and the negative contactor K2 of the pantograph are controlled to be closed, the second BMS sends charging permission and charging current, the power distribution controller takes the charging current as a first request current, the first request current is distributed and then request information is sent to each external charging equipment, and each external charging equipment outputs current to charge the second power battery pack according to the received information and the state of the external charging equipment; for example: the first request current is 6A, and then when the first request current is evenly distributed to three charging devices, the request current of each charging device is 2A; of course, the specific distribution mode is not limited, and can be adjusted according to the capacity of the charging equipment;
3) When the electric quantity difference between the first power battery pack and the second power battery pack is smaller than a set threshold value, disconnecting each contactor, judging the voltage of the two power battery packs, and if the voltages of the first power battery pack and the second power battery pack are unequal, starting a bidirectional DCDC (direct current) to balance the voltages between the two power battery packs;
4) When the voltages of the two power battery packs are equal, turning off the bidirectional DCDC, and adjusting the voltage of the external charging equipment to be within a permissible range according to the voltages again; then sequentially controlling to close a pantograph positive electrode contactor K1, a pantograph negative electrode contactor K2, a first power battery pack positive electrode contactor K3, a first power battery pack negative electrode contactor K5, a second power battery pack positive electrode contactor K4 and a second power battery pack negative electrode contactor K6, after the high-voltage system is connected, the first BMS and the second BMS send charging permission and charging current to a power distribution controller, the power distribution controller receives information, obtains second request current according to the charging current, distributes the second request current and then sends request information to each external charging device, and each external charging device determines output current according to the received information and the state of the external charging device, and the second request current is larger than the first request current in the step 2) because the two power battery packs are charged at the moment so as to meet the requirement of simultaneously charging the two power battery packs; for example: the second request current is 12A, and after the average distribution, the request current of each charging device is 4A, and when the output current of a certain charging device cannot reach 4A, the maximum output current of the charging device is output;
5) If the charging of the first power battery pack is completed, the first BMS sends a charging prohibition instruction, and the power distribution controller controls the disconnection of the positive electrode contactor K3 of the first power battery pack and the negative electrode contactor K5 of the first power battery pack; if the charging of the second power battery pack is completed, the second BMS sends a charging prohibition instruction, and the power distribution controller controls the disconnection of the positive electrode contactor K4 of the second power battery pack and the negative electrode contactor K6 of the second power battery pack, so that the charging is finished;
6) If serious faults (such as overcurrent, overvoltage, insulation and the like) occur in the charging process, the first BMS and/or the second BMS send a charging prohibition instruction to stop charging; if a general fault (e.g., an over-temperature fault, a communication fault, an over-temperature warning, etc.) occurs, the first BMS and/or the second BMS send a current-reduction charging command.
The charging processes of the single-pantograph charging mode, the single-socket charging mode and the double-socket charging mode are basically the same as those of the charging modes of the pantograph socket and the charging mode, but the connected charging devices are different, the power distribution controller can distribute the request current according to the number of the connected charging devices, and if a plurality of charging devices are provided, the charging devices can be distributed evenly and also can be distributed according to the charging capability of each charging device.
In the step 3), the phenomenon that the electric quantity difference exceeds a set threshold value does not occur in the voltage equalization process, and return difference exists between the electric quantity difference threshold values, so that jump around the threshold value is avoided; the voltage and the electric quantity have an internal relation, the overall electric quantity is low in low voltage, the electric quantity is high in high voltage, the middle is a voltage platform period, the voltage change is not large, but when the electric quantity is the same, the voltage is not necessarily consistent, and when the voltage is inconsistent, the external charging can have transient high current, so that voltage equalization is needed to avoid the phenomenon.
In summary, the charging method of the present invention can be summarized as:
1) Acquiring electric quantity of the first power battery pack and the second power battery pack;
2) Comparing the electric quantity of the first power battery pack with that of the second power battery pack; if the electric quantity difference between the first power battery pack and the second power battery pack is larger than or equal to a set threshold value, controlling the power battery pack with lower electric quantity to carry out external charging; until the electric quantity difference of the two power battery packs is smaller than a set threshold value;
3) When the electric quantity difference of the two power battery packs is smaller than a set threshold value, acquiring the voltage of the first power battery pack and the voltage of the second power battery pack, and if the voltage of the first power battery pack and the voltage of the second power battery pack are unequal, starting bidirectional DCDC between the two power battery packs to perform voltage equalization;
4) When the voltages of the two power battery packs are equal, the bidirectional DCDC is turned off, and the two power battery packs are simultaneously and externally charged.
The charging process of the quick charging mode is as follows: the pantograph, the first charging socket and the second charging socket charge a power battery pack in multiple ways, and the charging mode is the same as the charging equipment connected with the cooperative charging mode of the pantograph socket, so that the method for selecting the quick charging mode is selected manually or is selected and controlled through the background. The essence of the fast charging mode is to increase the charging current of the power battery pack, and the charging current exceeds the charging current during normal charging but is smaller than the maximum charging current of the power battery pack, which is a damage to the power battery pack, but the fast charging mode can be adopted for charging firstly due to the emergency requirement of the departure so as to meet the driving requirement.
For example: when the voltage of the charging equipment reaches the allowable range, the pantograph positive electrode contactor K1, the pantograph negative electrode contactor K2, the first power battery positive electrode contactor K3 and the first power battery negative electrode contactor K5 are closed one by one, then the power distribution controller distributes the request current through calculation, sends the distributed request current to the charging equipment, and each charging equipment realizes the output of the current according to the state of the charging equipment. Of course, if a serious fault occurs in the charging process, the first BMS sends a charging prohibition instruction to stop charging; if a general failure occurs, the first BMS transmits a current-down charging command.
The charging process of the temporary charging mode is as follows: the distribution controller reads the electric quantity of each power battery pack through the first BMS and the second BMS, if the electric quantity of the first power battery pack is larger than the electric quantity of the second power battery pack, the control starts the bidirectional DCDC, the electric energy of the first power battery pack is transmitted to the second power battery pack with smaller power, the energy transmission is realized, and the purpose of temporary charging is achieved. Temporary charging is required because the amount of power of a single power battery pack is too low due to the operation of the vehicle.
Meanwhile, as shown in fig. 4, the vehicle-mounted monitoring system can store all operation information and program information through the gateway and upload the operation information and the program information to a server of the central service station through the vehicle-mounted wireless terminal; the program file of the vehicle management system can be issued to the vehicle-mounted wireless terminal of the passenger car through the server, and then received by the vehicle-mounted monitoring system, and the local upgrade of the components is realized through authentication handshake.
In addition, the subsystem controller is connected with the BMS, so that 24-hour uninterrupted monitoring and information pushing of the battery on line and off line can be realized, timely early warning of vehicle faults is realized, fault positions or components are uploaded to the maintenance system, and maintenance efficiency can be improved. The vehicle-mounted wireless terminal can rely on a public network or an own base station, realize the transmission of vehicle operation information through a vehicle-mounted monitoring system, support functions of V2V, V2G and the like, support the information interconnection of vehicles and a local traffic system through a line dispatching system, and realize public traffic priority. The vehicles are communicated with each other, so that the cooperative control of multiple vehicles in peak period is realized, and the transport capacity and transport speed of the vehicles are improved
In the above embodiment, after the pantograph, the first charging socket and the first charging socket are connected in parallel, the two power battery packs are charged as a total charging input branch, a pantograph positive electrode contactor K1 is provided on a pantograph positive electrode branch, a pantograph negative electrode contactor K2 is provided on a pantograph negative electrode branch, a first power battery pack positive electrode contactor K3 is provided on a first power battery pack positive electrode branch, a first power battery pack negative electrode contactor K5 is provided on a first power battery pack negative electrode branch, a second power battery pack positive electrode contactor K4 is provided on a second power battery pack positive electrode branch, and a second power battery pack negative electrode contactor K6 is provided on a second power battery pack negative electrode branch; the second charging socket charging circuit is provided with a second charging socket contactor, and the distribution controller is controlled to be connected with each contactor. The invention does not limit the specific circuit connection relationship, as long as two power battery packs can be charged at the same time.
In the above embodiments, both the quick charge and the temporary charge are to meet the running requirement under specific conditions, and as other embodiments, these two charging methods may not be provided.
According to the invention, two power battery packs are charged simultaneously through the bidirectional DCDC, so that the charging efficiency and the charging reliability are improved.
Charging method embodiment of double-power system passenger car:
the specific process and effect of the charging method of the dual-power system passenger car are described in the above embodiments of the dual-power system passenger car, and are not described here again.
Claims (8)
1. The charging method of the double-power-system passenger car is characterized by comprising the following steps of:
1) Acquiring electric quantity of the first power battery pack and the second power battery pack;
2) Comparing the electric quantity of the first power battery pack with that of the second power battery pack; if the electric quantity difference between the first power battery pack and the second power battery pack is larger than or equal to a set threshold value, controlling the power battery pack with lower electric quantity to carry out external charging; until the electric quantity difference of the two power battery packs is smaller than a set threshold value;
3) When the electric quantity difference of the two power battery packs is smaller than a set threshold value, acquiring the voltage of the first power battery pack and the voltage of the second power battery pack, and if the voltage of the first power battery pack and the voltage of the second power battery pack are unequal, starting bidirectional DCDC between the two power battery packs to perform voltage equalization;
4) When the voltages of the two power battery packs are equal, the bidirectional DCDC is turned off, and the two power battery packs are simultaneously and externally charged.
2. The method of claim 1, wherein the external charging comprises a pantograph-socket collaborative charging mode, or a single-pantograph charging mode, or a single-socket charging mode, or a double-socket charging mode.
3. The method of claim 1, wherein when one of the power battery packs is to be charged quickly, the power battery pack is charged directly.
4. The method of claim 1, wherein when the power level of one of the power battery packs is low, the power battery pack with the higher power level is controlled to temporarily charge the power battery pack with the lower power level.
5. A double-power system passenger car comprises a passenger car body, a first power system and a second power system; the first power system comprises a first BMS, a first charging interface and a first power battery pack; the second driving system includes second BMS, second interface, second power battery group that charges, its characterized in that still includes:
the bidirectional DCDC is arranged between the first power battery pack and the second power battery pack;
the power distribution controller is in communication connection with the first BMS and the second BMS; and a power distribution controller is in control connection with the bi-directional DCDC, the power distribution controller comprising a processor, a memory and a computer program stored in the memory and executable on the processor, the processor implementing the method of charging a double power system bus as claimed in any one of claims 1, 3, 4 when the computer program is executed.
6. The dual power system bus of claim 5 further comprising a pantograph and a pantograph charging circuit, a first charging socket and a first charging socket charging circuit, a second charging socket and a second charging socket charging circuit; the pantograph is connected with the first charging interface and the second charging interface through a pantograph charging circuit; the first charging socket is connected with the first charging interface and the second charging interface through a first charging socket charging circuit; the second charging socket is connected with the first charging interface and the second charging interface through a second charging socket charging circuit.
7. The dual power system passenger vehicle of claim 6, wherein a pantograph contactor is provided on the pantograph charging circuit; the first charging socket charging circuit is provided with a first charging socket contactor; the second charging socket charging circuit is provided with a second charging socket contactor; the distribution controller is connected with each contactor in a control way.
8. The dual power system passenger vehicle of claim 5, further comprising an on-board monitoring system and an on-board wireless terminal to enable information interaction with a service center.
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Address after: No. 6, Yutong Road, Guancheng Hui District, Zhengzhou, Henan 450061 Applicant after: Yutong Bus Co.,Ltd. Address before: No.1, Shibali Heyu Road, Guancheng Hui District, Zhengzhou City, Henan Province Applicant before: ZHENGZHOU YUTONG BUS Co.,Ltd. |
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