CN117360310B - Vehicle charging control method and system using extended-range power battery - Google Patents
Vehicle charging control method and system using extended-range power battery Download PDFInfo
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- CN117360310B CN117360310B CN202311669172.3A CN202311669172A CN117360310B CN 117360310 B CN117360310 B CN 117360310B CN 202311669172 A CN202311669172 A CN 202311669172A CN 117360310 B CN117360310 B CN 117360310B
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Classifications
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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
- 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
- B60L53/60—Monitoring or controlling charging stations
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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
- 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
- B60L53/30—Constructional details of charging stations
- B60L53/31—Charging columns specially adapted for 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
- 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
- B60L53/60—Monitoring or controlling charging stations
- B60L53/66—Data transfer between charging stations and vehicles
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a vehicle charging control method and a vehicle charging control system using a range-extending power battery, which belong to the technical field of vehicle charging control. The disadvantage that the battery can not be charged through the charging pile and the reverse power supply is needed by using the fuel generator is completely solved, and meanwhile, the problem that the BMS can not control the charging relay under the condition is solved through the whole vehicle controller VCU.
Description
Technical Field
The invention belongs to the technical field of vehicle charging control, and particularly relates to a vehicle charging control method and system using a range-extending power battery.
Background
With the rapid development of automobile technology, the functional complexity of vehicles is increasingly improved, the regulatory requirements on safety, environmental protection and energy conservation are increasingly strict, the requirements of comfortable, flexible and personalized clients are widely different, the market competition is globalized, and the special requirements on the control level in the development process are increasingly increased.
In the development process of the automobile, programs written in the whole automobile controller need to be developed according to target market requirements, regulation requirements, automobile type configuration, special requirements of customer groups in special development projects and the like.
In the existing technologies of passenger cars and commercial vehicles, the charging process of a new energy vehicle is that a battery management system (BMS, battery Management System) of a charging pile and a power battery performs autonomous data interaction to complete charging handshake identification and a subsequent national standard charging process after a whole vehicle controller (VCU, vehicle Control Unit) is awakened by a charging gun, and the VCU is not required to do any other additional matters during charging until the charging is completed. However, the above-mentioned manner is to the range-extending power battery then unable to charge through outside fills electric pile, because this battery is using and fills electric pile when charging and fills electric pile and battery management system BMS and carry out the autonomous interaction and get into national standard charging process to in this power battery system BMS unable control charging relay, need use the fuel generator to charge for power battery. However, for a pure electric vehicle that must use an extended-range power battery and be charged by using a charging pile, the charging problem must be solved by other special means, and the present technology is to develop a special requirement for a vehicle charging control mode based on the special requirement.
Disclosure of Invention
Aiming at the defects in the prior art, the vehicle charging control method using the extended-range power battery solves the problem that the existing new-energy pure electric vehicle using the extended-range power battery cannot be charged through a charging pile and needs to be charged by using a fuel generator.
In order to achieve the aim of the invention, the invention adopts the following technical scheme: a vehicle charge control method using an extended-range power battery, comprising the steps of:
s1, receiving a gun inserting signal of a vehicle charging gun, wherein a charging pile is started;
s2, judging whether the condition is met: the charging A+ signal and the CC2 signal are changed, the whole vehicle controller VCU is awakened, and the charging A+ signal and the CC2 signal are analyzed into effective values by the whole vehicle controller VCU;
if yes, enter step S3;
if not, repeating the step S2 until the condition is met;
s3, transmitting the upper high-voltage command and the effective values of the charging A+ signal and the charging CC2 signal to a battery management system BMS through a vehicle controller VCU;
s4, after the battery management system BMS receives the upper high-voltage instruction, the main negative relay of the power battery is controlled to be closed, and the main negative relay is fed back to the whole vehicle controller VCU;
after receiving the effective values of the charging A+ signal and the CC2 signal, switching the power battery into a charging mode, and preparing to enter a national standard charging flow;
s5, based on the received main negative relay closing signal, controlling the charging relay to be closed through a vehicle control unit VCU, and formally entering a national standard charging process;
s6, carrying out handshake identification of the national standard charging flow according to the data interaction mode corresponding to the current whole vehicle charging CAN network, and judging whether the handshake identification is successful or not;
if so, charging according to the national standard charging flow;
if not, the charging fails.
Further, in the step S6, the whole vehicle charging CAN network is a first CAN network or a second CAN network;
wherein, the first CAN network is: the whole vehicle controller VCU is respectively in communication connection with the battery management system BMS and the charging pile through the same CAN bus;
the second CAN network is as follows: the whole vehicle controller VCU is respectively in communication connection with the battery management system BMS and the charging pile through one way of CAN bus.
Further, in the step S6, when the vehicle charging CAN network is the first CAN network, the step S6 specifically includes:
entering a handshake identification stage of a national standard charging flow, directly carrying out CAN data interaction through a charging pile and a battery management system BMS, and judging whether handshake identification is successful or not;
if so, charging according to the national standard charging flow;
if not, the charging fails.
Further, in the step S6, when the vehicle charging CAN network is the second CAN network, the step S6 specifically includes:
the vehicle control unit VCU is used as a data interaction relay station between the charging pile and the battery management system BMS;
entering a national standard charging flow, sending a charging related message to a battery management system BMS by a charging pile through a whole vehicle controller VCU, and sending a feedback charging related message to the charging pile by the battery management system BMS through the whole vehicle controller VCU, so that the charging pile and the battery management system BMS indirectly perform CAN data interaction, handshake identification is performed, and whether handshake identification is successful or not is judged;
if so, charging according to the national standard charging flow;
if not, the charging fails.
Further, when the whole vehicle charging CAN network is a second CAN network, setting time delay of a handshake identification starting time point when the charging pile and the battery management system BMS are ready to enter a national standard charging flow;
the time delay is larger than the difference between the time of the charging pile and the battery management system BMS entering the national standard charging process and the time of the charging relay entering the national standard charging process after being closed.
A vehicle charge control system comprising:
the charging pile is used for charging the power battery based on CAN data interaction between the charging pile and the battery management system BMS;
the whole vehicle charging CAN network is used for determining a data interaction mode of the charging pile and the battery management system BMS;
the vehicle controller VCU is used for carrying out charging control according to the received vehicle charging signal;
the battery management system BMS is used for controlling the power battery to enter a charging mode;
and the power battery is used as a charging object of the charging pile.
Further, the whole vehicle charging CAN network is a first CAN network or a second CAN network;
wherein, the first CAN network is: the whole vehicle controller VCU is respectively in communication connection with the battery management system BMS and the charging pile through the same CAN bus;
the second CAN network is as follows: the whole vehicle controller VCU is respectively in communication connection with the battery management system BMS and the charging pile through one way of CAN bus.
Further, when the vehicle charging CAN network is the second CAN network, the vehicle controller VCU is further used as a relay station when the charging pile and the battery management system BMS perform CAN data interaction.
Further, when the whole vehicle charging CAN network is the second CAN network, in a charging mode, the battery management system BMS controls the main negative relay of the power battery to be closed after receiving an upper high voltage instruction of the whole vehicle controller VCU, prepares to enter a national standard charging process, and then controls the charging relay to be closed through the whole vehicle controller VCU to formally enter the national standard charging process.
Further, when the charging pile and the battery management system BMS are ready to enter the national standard charging process, a time delay of a handshake identification start time point when entering the national standard charging process is set.
The beneficial effects of the invention are as follows:
(1) According to the invention, the VCU is used as a bridge between the charging pile and the battery management system BMS, the charging relay is controlled by replacing the BMS with the VCU, and the problem that the extended-range power battery cannot be charged by using the charging pile is solved by changing the whole vehicle charging CAN network architecture or using the VCU as a data interaction relay station between the charging pile and the battery management system BMS.
(2) According to the invention, the whole vehicle controller VCU is used as a bridge for charging to connect the charging pile with the battery management system BMS, so that the charging pile and the battery management system BMS can interact, and the vehicle can send a gun inserting signal, related hardware signals and other related information to the battery management system BMS after the gun is inserted to start the charging pile, so that the power battery system can be switched into a charging mode.
(3) In the invention, the whole vehicle controller VCU replaces the BMS to control the charging relay of the whole vehicle, when the battery management system BMS receives the upper high voltage of the VCU to instruct the main negative relay of the power battery to be closed in a charging mode, the VCU immediately closes the charging relay to start a charging handshake identification stage of a national standard charging process, and a corresponding delay is needed at the initial time point of the charging handshake identification stage, thereby avoiding charging failure caused by handshake identification overtime.
(4) The charging scheme of the extended-range power battery designed by the invention is based on the first development and use of the extended-range power battery used by the new energy vehicle.
Drawings
Fig. 1 is a flowchart of a vehicle charging control method using an extended-range power battery according to the present invention.
Fig. 2 is a first CAN network configuration diagram provided by the present invention.
Fig. 3 is a diagram of a second CAN network according to the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and all the inventions which make use of the inventive concept are protected by the spirit and scope of the present invention as defined and defined in the appended claims to those skilled in the art.
Example 1:
the embodiment of the invention provides a vehicle charging control method using an extended-range power battery, as shown in fig. 1, comprising the following steps:
s1, receiving a gun inserting signal of a vehicle charging gun, wherein a charging pile is started;
s2, judging whether the condition is met: the charging A+ signal and the CC2 signal are changed, the whole vehicle controller VCU is awakened, and the charging A+ signal and the CC2 signal are analyzed into effective values by the whole vehicle controller VCU;
if yes, enter step S3;
if not, repeating the step S2 until the condition is met;
s3, transmitting the upper high-voltage command and the effective values of the charging A+ signal and the charging CC2 signal to a battery management system BMS through a vehicle controller VCU;
s4, after the battery management system BMS receives the upper high-voltage instruction, the main negative relay of the power battery is controlled to be closed, and the main negative relay is fed back to the whole vehicle controller VCU;
after receiving the effective values of the charging A+ signal and the CC2 signal, switching the power battery into a charging mode, and preparing to enter a national standard charging flow;
s5, based on the received main negative relay closing signal, controlling the charging relay to be closed through a vehicle control unit VCU, and formally entering a national standard charging process;
s6, carrying out handshake identification of the national standard charging flow according to the data interaction mode corresponding to the current whole vehicle charging CAN network, and judging whether the handshake identification is successful or not;
if so, charging according to the national standard charging flow;
if not, the charging fails.
According to the vehicle charging control method provided by the embodiment of the invention, when a user requires a power battery with large discharge rate capability and a charging pile is required to be used for charging, the extended range power battery is selected as the rechargeable battery, and therefore, the vehicle charging control method provided by the embodiment of the invention enables the vehicle controller VCU to be used as a bridge of the charging pile and a battery management system BMS, directly controls a charging relay by the VCU and changes a vehicle charging CAN network architecture, or does not change the vehicle charging CAN network architecture and uses the vehicle controller VCU as a relay station for CAN data interaction of the vehicle charging controller VCU and the battery management system BMS in the whole charging period of the vehicle, so that the vehicle charging control method and the vehicle charging control system CAN enter a national standard charging process interactively. The disadvantage that the extended-range power battery cannot be charged through the charging pile and the fuel generator is required to be used for reverse power supply (namely charging) is completely solved, and meanwhile, the situation that the BMS cannot control the charging relay under the condition is solved through the VCU; the vehicle charging scheme and the charging flow provided by the embodiment of the invention strictly adhere to GB/T27930-2015.
In step S6 of the embodiment of the present invention, in the existing technology of passenger cars or commercial vehicles, for vehicles using common power batteries, the communication between the whole car controller VCU and the battery management system BMS (i.e., power CAN) and the communication between the whole car controller VCU and the charging pile (i.e., charging CAN) are not on the same CAN bus, and the charging pile and the battery management system BMS CAN autonomously perform communication interaction without additional VCU doing other things; however, in the application, when the vehicle using the extended range type power battery is charged and external charging is required to be performed by using the charging pile, the embodiment of the invention provides two types of whole vehicle charging CAN networks, namely the whole vehicle charging CAN network in the embodiment of the invention is a first CAN network or a second CAN network;
wherein, the first CAN network is: the whole vehicle controller VCU is respectively in communication connection with the battery management system BMS and the charging pile through the same CAN bus; the second CAN network is as follows: the whole vehicle controller VCU is respectively in communication connection with the battery management system BMS and the charging pile through one way of CAN bus.
Specifically, fig. 2 shows a first CAN network provided by an embodiment of the present invention, which is a complete vehicle charging CAN network architecture based on extended-range power battery charging redesign in the embodiment of the present invention, and designs communication between a battery management system BMS and a complete vehicle controller VCU and between a charging pile and a complete vehicle controller VCU on the same CAN bus (communication between the battery management system BMS, the complete vehicle controller VCU and the charging pile is performed through the same CAN bus 2 in fig. 2), so that after the complete vehicle controller VCU controls a charging relay to be closed, the BMS and the charging pile CAN perform autonomous data interaction on the same CAN bus, but ensure that the load of the same CAN bus cannot be too large, and CAN bus IDs cannot be too much, otherwise, interference exists during data interaction. Specifically, the fact that the CAN bus load cannot be too large means that the bus load is not greater than 90%, the CAN bus ID means that the ID number and related requirements in the national standard charging flow specified in GB/T27930 are used, and the IDs of all CAN control components on the same bus cannot be the same, if the IDs are the same, communication collision CAN occur.
As shown in fig. 3, the second CAN network provided by the embodiment of the present invention is an existing CAN network architecture of a vehicle, and the power CAN and the charging CAN are not on the same CAN bus (in fig. 3, the battery management system BMS and the whole vehicle controller VCU communicate through the CAN bus 2, and the whole vehicle controller VCU and the charging pile communicate through the CAN bus 5); when the extended-range battery is used, the charging pile and the battery management system BMS cannot conduct data interaction, so that the whole vehicle controller VCU is required to be used as a relay station of the charging pile and the battery management system BMS after the charging relay is controlled to be closed, and the CAN network architecture CAN indirectly conduct CAN data interaction, and therefore a charging function is achieved.
The embodiment of the invention provides a method for carrying out national standard charging process handshake identification based on the two CAN networks;
in this embodiment, when the entire vehicle charging CAN network is the first CAN network, step S6 specifically includes:
entering a handshake identification stage of a national standard charging flow, directly carrying out CAN data interaction through a charging pile and a battery management system BMS, and judging whether handshake identification is successful or not;
if so, charging according to the national standard charging flow;
if not, the charging fails.
In this embodiment, when the entire vehicle charging CAN network is the second CAN network, the charging of the extended-range power battery using the charging pile is realized in this way, which may have a problem of delay in charging time sequence, which may cause a related communication timeout fault to cause a charging suspension or a charging failure, and the factors need to be considered and corresponding time delay is performed for the related points in design.
In this embodiment, when the entire vehicle charging CAN network is the second CAN network, when the charging pile and the battery management system BMS prepare to enter the national standard charging flow, a time delay of a handshake identification start time point when entering the national standard charging flow is set.
Specifically, in step S4, when the battery and the charging pile enter the national standard charging process, a delay is required after the battery and the charging pile enter the national standard charging process, and after the delay is about 5 seconds to 10 seconds, the national standard charging handshake identification stage is started again, because the battery management system BMS cannot control the charging relay, the time sequence of closing the relevant relay during charging has some change in time, and secondly, because the time when the vehicle controller VCU is awakened after the gun is inserted to start the charging pile is about 3 seconds later than the BMS, a delay is required at the initial time point of the national standard charging handshake identification process stage, so that charging failure caused by handshake identification timeout is avoided; in step S5, the charging relay is closed and then formally enters the national standard charging process, and at this time, although the time when the charging pile and the battery management system BMS enter the national standard charging process is not the time when the system formally enters the national standard charging handshake identification stage.
Based on this, the time delay set in the embodiment of the present invention is greater than the difference between the time when the charging pile and the battery management system BMS enter the national standard charging process and the time when the charging relay is closed.
On the basis of setting the time delay, in the embodiment of the present invention, when the entire vehicle charging CAN network is the second CAN network, the step S6 specifically includes:
the vehicle control unit VCU is used as a data interaction relay station between the charging pile and the battery management system BMS;
entering a national standard charging flow, sending a charging related message to a battery management system BMS by a charging pile through a whole vehicle controller VCU, and sending a feedback charging related message to the charging pile by the battery management system BMS through the whole vehicle controller VCU, so that the charging pile and the battery management system BMS indirectly perform CAN data interaction, handshake identification is performed, and whether handshake identification is successful or not is judged;
if so, charging according to the national standard charging flow;
if not, the charging fails.
In step S6 of the embodiment of the present invention, after the handshake identification starts charging successfully, the charging process is ended until the gun is fully charged, the charging is manually stopped, or other factors are eliminated.
Example 2:
an embodiment of the present invention provides a vehicle charge control system of the vehicle charge control method in embodiment 1, including:
the charging pile is used for charging the power battery based on CAN data interaction between the charging pile and the battery management system BMS;
the whole vehicle charging CAN network is used for determining a data interaction mode of the charging pile and the battery management system BMS;
the vehicle controller VCU is used for carrying out charging control according to the received vehicle charging signal;
the battery management system BMS is used for controlling the power battery to enter a charging mode;
and the power battery is used as a charging object of the charging pile.
In the embodiment of the invention, the extended range type power battery with small electric quantity and large discharge multiplying power is charged, but the battery cannot be charged from the outside by using the charging pile, so that related circuits such as a charging socket and the like are added, and after the charging gun is inserted into the whole vehicle, the charging pile and the battery management system BMS cannot detect related charging pile and gun inserting signal information and cannot control a charging relay, and CAN data interaction cannot be performed; therefore, the charging CAN network architecture must be rearranged and designed or indirect CAN data interaction between the charging pile and the power battery management system BMS CAN be satisfied by means of VCU, so that information interaction CAN be performed on a CAN bus; based on the above, the whole vehicle charging CAN network in the embodiment of the invention is a first CAN network or a second CAN network
The first CAN network in this embodiment is directed to a network structure designed for an extended-range power battery, and specifically: the whole vehicle controller VCU is respectively in communication connection with the battery management system BMS and the charging pile through the same CAN bus;
the second CAN network is an existing network structure of the vehicle, and specifically, the whole vehicle controller VCU is respectively in communication connection with the battery management system BMS and the charging pile through one CAN bus. Based on the above, when the vehicle charging CAN network is the second CAN network, the vehicle controller VCU is also used as a relay station when the charging pile and the battery management system BMS perform CAN data interaction.
The working process of the vehicle charging control system in the embodiment of the invention is as follows:
the method comprises the steps that after the quick charging direct current charging pile is inserted into a gun, relevant gun inserting signals and other information are sent to a VCU, the VCU analyzes and then matches with corresponding states, then the relevant information and the states are sent to a battery management system BMS, the BMS controls a power battery according to instructions of the VCU, after the BMS is high-voltage, the VCU immediately sends a closing instruction to a charging relay, and the relay enters a charging handshake identification stage of the charging pile and the power battery after being closed;
when the first CAN network is adopted, after the charging relay is closed, the vehicle controller VCU CAN perform CAN communication interaction between the charging pile and the battery management system BMS, and after handshake is successful, follow-up charging work is continued according to the national standard charging flow until the charging jump gun is full, and charging is manually stopped or other conditions are met;
when adopting the second CAN network, the VCU is after closing charging relay, continues to act as the data interaction relay station between charging stake and the BMS, sends the data that fills electric pile and send to the BMS from the VCU, with the data transmission that BMS sent to filling electric pile. Therefore, data interaction can be indirectly carried out between the charging pile and the battery management system BMS, so that the charging pile and the battery management system BMS can carry out national standard charging flow until full charging and gun jumping, and charging is manually stopped or other conditions are met; wherein, communication among all components adopts CAN bus communication or hard wire control.
Further, when the whole vehicle charging CAN network is the second CAN network, in a charging mode, the battery management system BMS controls the main negative relay of the power battery to be closed after receiving an upper high voltage instruction of the whole vehicle controller VCU, prepares to enter a national standard charging process, and then controls the charging relay to be closed through the whole vehicle controller VCU to formally enter the national standard charging process.
When the charging pile and the battery management system BMS are ready to enter the national standard charging flow, setting time delay of a handshake identification starting time point when entering the national standard charging flow; the time delay is larger than the difference between the time when the charging pile and the battery management system BMS enter the national standard charging process respectively and the time when the charging relay is closed and enters the national standard charging process.
The invention CAN enable the vehicle to use the extended range power battery, on the premise of meeting the requirements of a user on low electric quantity and large discharge multiplying power, the vehicle controller VCU is used as a bridge of a charging pile and a battery management system BMS, the vehicle controller VCU directly controls a charging relay and changes the vehicle charging CAN network architecture, or the vehicle controller VCU is used as a relay station for the interaction of CAN data of the vehicle controller VCU and the vehicle charging CAN network architecture in the whole charging period of the vehicle without changing the vehicle charging CAN network architecture, so that the vehicle controller VCU and the vehicle charging network architecture CAN enter the national standard charging process interactively.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Those of ordinary skill in the art will recognize that the embodiments described herein are for the purpose of aiding the reader in understanding the principles of the present invention and should be understood that the scope of the invention is not limited to such specific statements and embodiments. Those of ordinary skill in the art can make various other specific modifications and combinations from the teachings of the present disclosure without departing from the spirit thereof, and such modifications and combinations remain within the scope of the present disclosure.
Claims (8)
1. A vehicle charge control method using an extended-range power battery, comprising the steps of:
s1, receiving a gun inserting signal of a vehicle charging gun, wherein a charging pile is started;
s2, judging whether the condition is met: the charging A+ signal and the CC2 signal are changed, the whole vehicle controller VCU is awakened, and the charging A+ signal and the CC2 signal are analyzed into effective values by the whole vehicle controller VCU;
if yes, enter step S3;
if not, repeating the step S2 until the condition is met;
s3, transmitting the upper high-voltage command and the effective values of the charging A+ signal and the charging CC2 signal to a battery management system BMS through a vehicle controller VCU;
s4, after the battery management system BMS receives the upper high-voltage instruction, the main negative relay of the power battery is controlled to be closed, and the main negative relay is fed back to the whole vehicle controller VCU;
after receiving the effective values of the charging A+ signal and the CC2 signal, switching the power battery into a charging mode, and preparing to enter a national standard charging flow;
s5, based on the received main negative relay closing signal, controlling the charging relay to be closed through a vehicle control unit VCU, and formally entering a national standard charging process;
s6, carrying out handshake identification of the national standard charging flow according to the data interaction mode corresponding to the current whole vehicle charging CAN network, and judging whether the handshake identification is successful or not;
if so, charging according to the national standard charging flow;
if not, the charging fails;
in the step S6, the whole vehicle charging CAN network is a first CAN network or a second CAN network;
wherein, the first CAN network is: the whole vehicle controller VCU is respectively in communication connection with the battery management system BMS and the charging pile through the same CAN bus;
the second CAN network is as follows: the whole vehicle controller VCU is respectively in communication connection with the battery management system BMS and the charging pile through one way of CAN bus.
2. The method for controlling vehicle charging using extended-range power battery according to claim 1, wherein in step S6, when the entire vehicle charging CAN network is the first CAN network, step S6 specifically includes:
entering a handshake identification stage of a national standard charging flow, directly carrying out CAN data interaction through a charging pile and a battery management system BMS, and judging whether handshake identification is successful or not;
if so, charging according to the national standard charging flow;
if not, the charging fails.
3. The method for controlling vehicle charging using extended-range power battery according to claim 1, wherein in step S6, when the entire vehicle charging CAN network is the second CAN network, step S6 specifically includes:
the vehicle control unit VCU is used as a data interaction relay station between the charging pile and the battery management system BMS;
entering a national standard charging flow, sending a charging related message to a battery management system BMS by a charging pile through a whole vehicle controller VCU, and sending a feedback charging related message to the charging pile by the battery management system BMS through the whole vehicle controller VCU, so that the charging pile and the battery management system BMS indirectly perform CAN data interaction, handshake identification is performed, and whether handshake identification is successful or not is judged;
if so, charging according to the national standard charging flow;
if not, the charging fails.
4. The vehicle charging control method using extended-range power battery according to claim 3, wherein when the entire vehicle charging CAN network is the second CAN network, when the charging pile and the battery management system BMS are ready to enter the national standard charging flow, a time delay of a handshake identification start time point when entering the national standard charging flow is set;
the time delay is larger than the difference between the time of the charging pile and the battery management system BMS entering the national standard charging process and the time of the charging relay entering the national standard charging process after being closed.
5. A vehicle charge control system based on the vehicle charge control method using an extended-range power battery according to any one of claims 1 to 4, characterized by comprising:
the charging pile is used for charging the power battery based on CAN data interaction between the charging pile and the battery management system BMS;
the whole vehicle charging CAN network is used for determining a data interaction mode of the charging pile and the battery management system BMS;
the vehicle controller VCU is used for carrying out charging control according to the received vehicle charging signal;
the battery management system BMS is used for controlling the power battery to enter a charging mode;
the power battery is used as a charging object of the charging pile;
the whole vehicle charging CAN network is a first CAN network or a second CAN network;
wherein, the first CAN network is: the whole vehicle controller VCU is respectively in communication connection with the battery management system BMS and the charging pile through the same CAN bus;
the second CAN network is as follows: the whole vehicle controller VCU is respectively in communication connection with the battery management system BMS and the charging pile through one way of CAN bus.
6. The vehicle charge control system of claim 5, wherein when the vehicle charge CAN network is a second CAN network, the vehicle controller VCU further acts as a relay station when the charging post and the battery management system BMS perform CAN data interaction.
7. The vehicle charging control system according to claim 5, wherein when the vehicle charging CAN network is the second CAN network, in the charging mode, the battery management system BMS controls the main negative relay of the power battery to be closed after receiving the upper high voltage command of the vehicle controller VCU, prepares to enter the national standard charging process, and then controls the charging relay to be closed through the vehicle controller VCU to formally enter the national standard charging process.
8. The vehicle charge control system according to claim 7, wherein a time delay of a handshake recognition start time point when entering the national charging flow is set when the charging stake and the battery management system BMS are ready to enter the national charging flow.
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