CN112428841A - Vehicle-mounted charging system and method - Google Patents
Vehicle-mounted charging system and method Download PDFInfo
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- CN112428841A CN112428841A CN202011421280.5A CN202011421280A CN112428841A CN 112428841 A CN112428841 A CN 112428841A CN 202011421280 A CN202011421280 A CN 202011421280A CN 112428841 A CN112428841 A CN 112428841A
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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
- B60L53/20—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 converters located in the vehicle
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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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- 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
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- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention belongs to the technical field of electric automobiles, and discloses a vehicle-mounted charging system and method. The system comprises: the vehicle charging interface, the vehicle-mounted charger, the power battery and the vehicle control unit; when the vehicle charging interface is accessed with electric energy, a charging signal is sent to a vehicle-mounted charger; the vehicle-mounted charger sends a charging wake-up signal to the vehicle control unit according to the charging signal; the vehicle control unit detects the state of the electric drive system when receiving the charging wake-up signal, and sends a charging permission command to a vehicle-mounted charger when the state of the electric drive system is a closed state; the vehicle-mounted charger outputs electric energy to the power battery according to the allowable charging command; the power battery receives the electric energy and carries out charging according to the electric energy. Through the mode, the vehicle can not enter the driving state in the charging process or when the charging cable is linked, and the vehicle-mounted charging device is prevented from being damaged or being in electric shock danger. The technical problem that an existing alternating current charging device has potential safety hazards is solved.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a vehicle-mounted charging system and method.
Background
With the expansion of the market of the pure electric cars, the pure electric cars are used more frequently. The charging device for the electric automobile is a device special for charging a vehicle battery of the electric automobile, and is a power conversion device with a specific function used for charging the battery. The charger of the electric vehicle can be divided into a direct current charging device and an alternating current charging device.
The existing alternating current charging device is designed to meet the charging requirements of the battery under different electric quantities by responding to the signal of the control system of the whole vehicle; the existing vehicle-mounted alternating current charging device has the defects that: at present, the function of the vehicle-mounted charging device generally does not consider the use habit of a user, and the charging safety can not be ensured. For example, when the vehicle is charged, the vehicle can run, the vehicle-mounted charging device can be damaged, and electric shock risks exist when the vehicle is repaired and disassembled.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a vehicle-mounted charging system and a vehicle-mounted charging method, and aims to solve the technical problem that the conventional alternating current charging device has potential safety hazards.
In order to achieve the above object, the present invention provides a vehicle-mounted charging system, including: the vehicle charging system comprises a vehicle charging interface, a vehicle-mounted charger, a power battery and a vehicle control unit, wherein the vehicle control unit is connected with the vehicle-mounted charger through a CAN (controller area network) bus, and the vehicle charging interface, the vehicle-mounted charger and the power battery are sequentially connected;
the vehicle charging interface is used for sending a charging signal to the vehicle-mounted charger when electric energy is accessed;
the vehicle-mounted charger is used for sending a charging wake-up signal to the vehicle control unit according to the charging signal;
the vehicle control unit is used for detecting the state of the electric drive system when receiving the charging wake-up signal, and sending a charging permission command to the vehicle-mounted charger when the state of the electric drive system is in a closed state;
the vehicle-mounted charger is also used for outputting electric energy to the power battery according to the allowable charging command;
and the power battery is used for receiving the electric energy and charging according to the electric energy.
Optionally, the vehicle-mounted charging system further includes a battery management controller in communication connection with the vehicle-mounted charger through a CAN bus, and the battery management controller is connected with the power battery;
the battery management controller is used for monitoring the state of the power battery to obtain the current state information of the power battery, determining expected electric energy information according to the current state information, and sending the expected electric energy information to the vehicle-mounted charger;
the vehicle-mounted charger is further used for adjusting the electric energy according to the expected electric energy information and outputting the adjusted electric energy to the power battery;
and the power battery is also used for receiving the adjusted electric energy and charging according to the adjusted electric energy.
Optionally, the vehicle-mounted charging system further includes a dc converter connected to the vehicle-mounted charger, and the dc converter is connected to the vehicle control unit;
the vehicle control unit is further configured to acquire state information of each port, detect the state information, send a forced shutdown instruction to the vehicle-mounted charger when the state information is abnormal, and send an electrical signal to the direct-current converter;
the direct current converter is used for receiving the electric signal and entering a hardware protection state according to the electric signal;
and the vehicle-mounted charger is also used for entering a forced shutdown state and stopping outputting electric energy when receiving the forced shutdown instruction.
Optionally, the vehicle control unit is further configured to obtain specification information of the power battery when a slow charging start signal is received, determine a target power according to the specification information, and send the target power to the vehicle-mounted charger;
and the vehicle-mounted charger is also used for determining target electric energy according to the target power and outputting the target electric energy to the power battery.
Optionally, the vehicle charging interface further comprises an electromagnetic lock control module, and the electromagnetic lock control module is connected with the vehicle control unit;
the vehicle control unit is also used for sending a forward driving signal to the electromagnetic lock control module when receiving a locking signal of the interface;
and the electromagnetic lock control module is used for receiving the forward driving signal and controlling the electromagnetic lock to lock according to the forward driving signal.
Optionally, the vehicle control unit is further configured to send a reverse driving signal to the electromagnetic lock control module when receiving an interface lock release signal;
the electromagnetic lock control module is also used for receiving the reverse driving signal and controlling the electromagnetic lock to carry out lock releasing operation according to the reverse driving signal.
Optionally, the vehicle control unit is further configured to, when the state of the electric drive system is an on state, cut off the motor drive circuit, and send a charging permission command to the vehicle-mounted charger.
Optionally, the vehicle-mounted charger is further configured to perform fault diagnosis on a self state to obtain a fault diagnosis result, and broadcast fault information to the CAN network when the fault diagnosis result indicates that a fault occurs.
In addition, in order to achieve the above purpose, the invention further provides a vehicle-mounted charging method, which is applied to the vehicle-mounted charging system, a vehicle charging interface, a vehicle-mounted charger, a power battery and a vehicle control unit;
the vehicle-mounted charging method comprises the following steps:
when the vehicle charging interface is accessed with electric energy, a charging signal is sent to the vehicle-mounted charger;
the vehicle-mounted charger sends a charging wake-up signal to the vehicle control unit according to the charging signal;
the vehicle control unit detects the state of an electric drive system when receiving the charging wake-up signal, and sends a charging permission command to the vehicle-mounted charger when the state of the electric drive system is a closed state;
the vehicle-mounted charger outputs electric energy to the power battery according to the allowable charging command;
and the power battery receives the electric energy and carries out charging according to the electric energy.
Optionally, the vehicle-mounted charging system further includes a battery management controller in communication connection with the vehicle-mounted charger through a CAN bus;
the power battery receives the electric energy, and after the step of charging according to the electric energy, the method further comprises:
the battery management controller monitors the state of the power battery to obtain the current state information of the power battery, determines expected electric energy information according to the current state information, and sends the expected electric energy information to the vehicle-mounted charger;
the vehicle-mounted charger adjusts the electric energy according to the expected electric energy information and outputs the adjusted electric energy to the power battery;
and the power battery receives the adjusted electric energy and charges according to the adjusted electric energy.
The vehicle-mounted charging system of the invention comprises: the vehicle charging interface, the vehicle-mounted charger and the power battery are sequentially connected; when the vehicle charging interface is accessed with electric energy, a charging signal is sent to a vehicle-mounted charger; the vehicle-mounted charger sends a charging wake-up signal to the vehicle control unit according to the charging signal; the vehicle control unit detects the state of the electric drive system when receiving the charging wake-up signal, and sends a charging permission command to a vehicle-mounted charger when the state of the electric drive system is a closed state; the vehicle-mounted charger outputs electric energy to the power battery according to the allowable charging command; the power battery receives the electric energy and carries out charging according to the electric energy. By the mode, the vehicle can not enter the driving state in the charging process or when the charging cable is linked, and the vehicle-mounted charging device is effectively prevented from being damaged and causing corresponding electric shock casualties due to misoperation. The technical problem that an existing alternating current charging device has potential safety hazards is solved.
Drawings
Fig. 1 is a block diagram showing the construction of a first embodiment of an in-vehicle charging system according to the present invention;
fig. 2 is a block diagram showing the construction of a second embodiment of the on-vehicle charging system of the invention;
FIG. 3 is a flowchart illustrating a first exemplary embodiment of a vehicle charging method according to the present invention;
fig. 4 is a flowchart illustrating a vehicle charging method according to a second embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
50 | |
| 20 | Vehicle-mounted |
60 | |
| 30 | |
70 | Electromagnetic |
| 40 | Vehicle control unit |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
An embodiment of the present invention provides a vehicle-mounted charging system, and referring to fig. 1, fig. 1 is a block diagram illustrating a structure of a first embodiment of the vehicle-mounted charging system according to the present invention.
In this embodiment, the vehicle-mounted charging system includes: the vehicle charging system comprises a vehicle charging interface 10, a vehicle-mounted charger 20, a power battery 30 and a vehicle controller 40, wherein the vehicle controller 40 is connected with the vehicle-mounted charger 20 through a CAN bus, and the vehicle charging interface 10, the vehicle-mounted charger 20 and the power battery 30 are sequentially connected;
the vehicle charging interface 10 is configured to send a charging signal to the vehicle-mounted charger 20 when electric energy is accessed. In this embodiment, the connection mode between the vehicle charging interface 10 and the cable is designed to be the connection mode specified in the national standard GB/T18487.1-2001, and when the vehicle charging interface 10 is connected to the cable, the vehicle charging interface 10 detects that there is an electric energy access.
And the vehicle-mounted charger 20 is configured to send a charging wake-up signal to the vehicle control unit 40 according to the charging signal. In this embodiment, the charging wake-up signal may be set to be a 12V voltage signal, and the vehicle-mounted charger 20 outputs the 12V charging wake-up signal to the vehicle control unit 40 when receiving the charging signal.
Specifically, in order to ensure safe power transmission of the charging line, the vehicle-mounted charger 20 is further configured to perform fault diagnosis on a self state to obtain a fault diagnosis result, and broadcast fault information to the CAN network when the fault diagnosis result indicates that a fault occurs. In this embodiment, the onboard charger 20 CAN perform self-checking and fault determination on itself, and broadcast the fault information via the CAN bus, so as to send the fault information to a Battery Management System (BMS) or a vehicle control unit 40 (VCU). The vehicle-mounted charger 20 has a CAN data communication function, and is controlled through CANBUS communication, and the vehicle-mounted charger 20 CAN receive various charging parameters sent by a VCU, respond to the corresponding charging function, and report related information of the vehicle-mounted charger 20 in real time.
The vehicle control unit 40 is configured to detect a state of the electric drive system when receiving the charge wake-up signal, and send a charge permission command to the vehicle-mounted charger 20 when the state of the electric drive system is an off state. In this embodiment, after the vehicle charging plug is plugged into the vehicle socket, the vehicle charging interface 10 detects that electric energy is connected, the vehicle control unit 40 receives the charging wake-up signal, enters a charging mode, checks the state of the electric drive system, and if the state of the electric drive system is in a closed state, the vehicle control unit 40 sends a charging permission command to the vehicle-mounted charger 20, and the vehicle-mounted charger 20 starts to output current after receiving the start command. The electric drive system is closed when charging is guaranteed, the vehicle is prevented from moving when charging, and danger is avoided.
Further, in order to ensure that the vehicle cannot enter a driving state during the charging process and eliminate potential safety hazards, the vehicle control unit 40 is further configured to cut off the motor driving circuit and send a charging permission command to the vehicle-mounted charger 20 when the electric drive system is in an on state. In this embodiment, the state of the electric drive system may be determined by detecting whether ignition is performed or not and whether the engine is in an operating state, in a specific implementation, the vehicle control unit 40 is connected to the motor drive circuit, the motor drive circuit is connected to the motor drive system, and the process of cutting off the point motor drive circuit may include the vehicle control unit 40 sending a drive stop signal to the motor drive circuit to stop driving the motor drive circuit.
And the vehicle-mounted charger 20 is further configured to output electric energy to the power battery 30 according to the charge permission command. In the present embodiment, when the charging condition is not satisfied, the vehicle-mounted charger 20 does not output the electric energy to the power battery 30 when the charge permission command is not received.
The power battery 30 is configured to receive the electric energy and perform charging according to the electric energy. In this embodiment, the charging process may include a constant current charging stage, a constant voltage charging stage, a full charging stage, and a floating charging stage. In the constant-current charging stage, the charging current is kept constant, the charged electric quantity is rapidly increased, and the voltage of the battery is increased; in the constant-voltage charging stage, the charging voltage can be kept constant, although the charging quantity can be continuously increased, the voltage of the battery slowly rises, and the charging current also drops; in the full-charging stage of the battery, the charging current is reduced to be lower than the floating charging conversion current, and the charging voltage is reduced to the floating charging voltage; in the floating charge stage, the charging voltage is maintained at the floating charge voltage. The vehicle-mounted charger 20 can perform voltage and current output adjustment according to the charging state of the power battery 30.
The vehicle-mounted charging system in the embodiment comprises: the vehicle charging interface, the vehicle-mounted charger and the power battery are sequentially connected; when the vehicle charging interface is accessed with electric energy, a charging signal is sent to a vehicle-mounted charger; the vehicle-mounted charger sends a charging wake-up signal to the vehicle control unit according to the charging signal; the vehicle control unit detects the state of the electric drive system when receiving the charging wake-up signal, and sends a charging permission command to a vehicle-mounted charger when the state of the electric drive system is a closed state; the vehicle-mounted charger outputs electric energy to the power battery according to the allowable charging command; the power battery receives the electric energy and carries out charging according to the electric energy. By the mode, the vehicle can not enter the drivable state in the charging process or when the charging cable is linked, the vehicle-mounted charging device is effectively prevented from being damaged and causing corresponding electric shock casualties due to misoperation, and the technical problem that the existing alternating current charging device has potential safety hazards is solved.
Referring to fig. 2, fig. 2 is a block diagram illustrating a second embodiment of the vehicle charging system according to the present invention.
Based on the first embodiment, in this embodiment, the vehicle-mounted charging system further includes a battery management controller 50 communicatively connected to the vehicle-mounted charger 20 through a CAN bus, where the battery management controller 50 is connected to the power battery 30;
the battery management controller 50 is configured to monitor the state of the power battery 30, obtain current state information of the power battery 30, determine expected electric energy information according to the current state information, and send the expected electric energy information to the vehicle-mounted charger 20. In this embodiment, the vehicle-mounted charger 20, the battery management controller 50 and the vehicle control unit 40 realize information interaction through CAN communication, the battery management controller 50 monitors and manages the charging state of the power battery 30, the battery management controller 50 determines the charging voltage and the charging current according to the performance of the battery, and sends expected electric energy information to the vehicle-mounted charger 20 through a CAN bus, so as to dynamically control the vehicle-mounted charger 20; the vehicle control unit 40 manages and monitors the states of other relevant parts of the vehicle, and dynamically controls the vehicle-mounted charger 20 through the CAN.
The vehicle-mounted charger 20 is further configured to adjust electric energy according to the expected electric energy information, and output the adjusted electric energy to the power battery 30. In this embodiment, the vehicle-mounted charger 20 adjusts the output voltage and current according to the instruction issued by the battery management controller 50. The process of adjusting the electrical energy may include adjusting the charging voltage as well as the charging current.
The power battery 30 is further configured to receive the adjusted electric energy, and perform charging according to the adjusted electric energy.
Referring to fig. 2, in the present embodiment, the vehicle-mounted charging system further includes a dc converter 60 connected to the vehicle-mounted charger 20, where the dc converter 60 is connected to the vehicle control unit 40;
the vehicle control unit 40 is further configured to obtain status information of each port, detect the status information, send a forced shutdown instruction to the vehicle-mounted charger 20 when the status information is abnormal, and send an electrical signal to the dc converter 60. In this embodiment, the vehicle-mounted charger 20 has functions of input overvoltage, input undervoltage, output overvoltage, output undervoltage, output overcurrent, output short circuit/input short circuit, over-temperature of the vehicle-mounted charger 20, safety isolation protection, and the like. The vehicle control unit 40 detects each port, and after detecting an abnormality and reaching a protection trigger condition, sends a forced shutdown instruction to the vehicle-mounted charger 20, and sends an electrical signal to the dc converter 60.
The dc converter 60 is configured to receive the electrical signal and enter a hardware protection state according to the electrical signal. In this embodiment, the dc converter 60 controls the power circuit to enter hardware protection, and ensures that the machine is restarted before returning to normal. Until abnormal state information is detected to preclude or restart recovery.
The vehicle-mounted charger 20 is further configured to enter a forced shutdown state and stop outputting electric energy when receiving the forced shutdown instruction. In this embodiment, the vehicle control unit 40 controls the vehicle-mounted charger 20 to enter a software forced shutdown state.
Referring to fig. 2, in this embodiment, the vehicle control unit 40 is further configured to, when receiving a slow charging start signal, obtain specification information of the power battery 30, determine a target power according to the specification information, and send the target power to the vehicle-mounted charger 20. In this embodiment, in order to realize slow charging of the power battery 30, the vehicle control unit 40 designs matching power according to the specification of the power battery 30, and sends the matching power as target power to the vehicle-mounted charger 20.
The vehicle-mounted charger 20 is further configured to determine a target electric energy according to the target power, and output the target electric energy to the power battery 30. In this embodiment, the slow charging mode is a conduction charging mode, a 220V ac power supply is taken from the power grid through a power supply interface of the power supply device, the charging plug assembly introduces ac power of the power supply device into the vehicle-mounted charger 20, and the vehicle-mounted charger 20 converts the ac power into high-voltage dc power, so as to charge the power battery 30.
Referring to fig. 2, in the present embodiment, the vehicle charging interface 10 further includes an electromagnetic lock control module 70, and the electromagnetic lock control module 70 is connected to the vehicle control unit 40;
the vehicle control unit 40 is further configured to send a forward driving signal to the electromagnetic lock control module 70 when receiving the interface locking signal. In the embodiment, the electromagnetic lock is added to the vehicle socket, and the vehicle control system controls the locking and the locking of the electromagnetic lock. The lock signal may be input by a user, for example, the user clicks a lock button. The locking signal can also be triggered by a charging signal, and the basic principle of the electromagnetic lock is that the electromagnetic lock control module 70 drives the lock pin to move forward and backward to realize the locking and unlocking functions. The electromagnetic lock driving signal can be direct current 12V and 3A current, and the signal time is less than 0.2S.
The electromagnetic lock control module 70 is configured to receive the forward driving signal, and control the electromagnetic lock to perform a locking operation according to the forward driving signal. In this embodiment, the electromagnetic lock control module 70 may be an electromagnetic coil, and when the electromagnetic coil obtains a forward driving signal, the lock pin advances to realize the locking function.
The vehicle control unit 40 is further configured to send a reverse driving signal to the electromagnetic lock control module 70 when receiving the interface lock release signal. In this embodiment, the lock-down signal may be input by a user, for example, the user clicks a lock-down button. The lock-down signal may be triggered by a charge complete or plug-out signal.
The electromagnetic lock control module 70 is further configured to receive the reverse driving signal, and control the electromagnetic lock to perform a lock releasing operation according to the reverse driving signal. In this embodiment, when the electromagnetic lock control module 70 obtains the reverse driving signal, the lock pin is retracted to realize the lock releasing function.
This embodiment has proposed to monitor through the state to power battery 30, real-time adjustment electric energy that charges, and each port state of real-time supervision, guarantee charging process normal operating, provide the mode of charging slowly, ensure charging safety, and it is provided with the electromagnetic lock at the vehicle socket moreover, realize charging cable theftproof, avoid electrocuteeing danger, can make the vehicle charging wire connect the back, can not pull it down easily, ensure car owner property safety, the technical problem of current alternating current charging device existence potential safety hazard has been solved.
Referring to fig. 3, fig. 3 is a flowchart illustrating a first embodiment of a vehicle charging method according to the present invention.
As shown in fig. 3, the vehicle-mounted charging method provided by the embodiment of the invention is applied to the vehicle-mounted charging system, a vehicle charging interface, a vehicle-mounted charger, a power battery and a vehicle controller;
the vehicle-mounted charging method comprises the following steps:
step S10: and when the vehicle charging interface is accessed by electric energy, the vehicle charging interface sends a charging signal to the vehicle-mounted charger.
It can be understood that the connection mode of the vehicle charging interface and the cable is designed to be the connection mode specified in the national standard GB/T18487.1-2001, and when the vehicle charging interface is connected with the cable, the vehicle charging interface detects that the electric energy is accessed.
Step S20: and the vehicle-mounted charger sends a charging awakening signal to the vehicle control unit according to the charging signal.
It should be noted that the charging wake-up signal may be set to be a 12V voltage signal, and the vehicle-mounted charger outputs the 12V charging wake-up signal to the vehicle control unit when receiving the charging signal.
Specifically, in order to ensure safe power transmission of the charging line, the vehicle-mounted charger is further configured to perform fault diagnosis on the self state to obtain a fault diagnosis result, and broadcast fault information to the CAN network when the fault diagnosis result indicates that a fault occurs.
It is understood that the in-vehicle charger CAN perform self-test and fault determination on itself and broadcast the fault information through the CAN bus to be transmitted to a Battery Management System (BMS) or a Vehicle Control Unit (VCU). The vehicle-mounted charger has a CAN data communication function, is controlled through CANBUS communication, CAN receive various charging parameters sent by a VCU, responds to the corresponding charging function, and reports related information of the vehicle-mounted charger in real time.
Step S30: and the vehicle control unit detects the state of the electric drive system when receiving the charging wake-up signal, and sends a charging permission command to the vehicle-mounted charger when the state of the electric drive system is in a closed state.
After the vehicle charging plug is plugged into the vehicle socket, the vehicle charging interface detects that electric energy is connected, the vehicle controller receives a charging wake-up signal, enters a charging working mode, checks the state of the electric drive system, and sends a charging permission command to the vehicle-mounted charger if the state of the electric drive system is a closed state, and the vehicle-mounted charger starts to output current after receiving a starting command. The electric drive system is closed when charging is guaranteed, the vehicle is prevented from moving when charging, and danger is avoided.
Further, in order to ensure that the vehicle cannot enter a running state in the charging process and eliminate potential safety hazards, the vehicle control unit is further configured to cut off the motor driving circuit and send a charging permission command to the vehicle-mounted charger when the electric drive system is in an on state.
It should be appreciated that the state of the electric drive system may be determined by detecting whether the ignition is present and whether the engine is in an operating state, in a specific implementation, the vehicle control unit is connected to the motor drive circuit, the motor drive circuit is connected to the motor drive system, and the process of disconnecting the point motor drive circuit may include the vehicle control unit sending a stop drive signal to the motor drive circuit to stop driving the motor drive circuit.
Step S40: and the vehicle-mounted charger outputs electric energy to the power battery according to the allowable charging command.
When the charging condition is not met, the vehicle-mounted charger does not output the electric energy to the power battery when the vehicle-mounted charger does not receive the charge permission command.
Step S50: and the power battery receives the electric energy and carries out charging according to the electric energy.
It will be appreciated that the charging process may include a constant current charging phase, a constant voltage charging phase, a full charge phase, and a float charge phase. In the constant-current charging stage, the charging current is kept constant, the charged electric quantity is rapidly increased, and the voltage of the battery is increased; in the constant-voltage charging stage, the charging voltage can be kept constant, although the charging quantity can be continuously increased, the voltage of the battery slowly rises, and the charging current also drops; in the full-charging stage of the battery, the charging current is reduced to be lower than the floating charging conversion current, and the charging voltage is reduced to the floating charging voltage; in the floating charge stage, the charging voltage is maintained at the floating charge voltage. The vehicle-mounted charger can output and adjust voltage and current according to the charging state of the power battery.
In this embodiment, the vehicle-mounted charging method is applied to a vehicle-mounted charging system, and the vehicle-mounted charging system includes: the vehicle charging interface, the vehicle-mounted charger and the power battery are sequentially connected; when the vehicle charging interface is accessed with electric energy, a charging signal is sent to a vehicle-mounted charger; the vehicle-mounted charger sends a charging wake-up signal to the vehicle control unit according to the charging signal; the vehicle control unit detects the state of the electric drive system when receiving the charging wake-up signal, and sends a charging permission command to a vehicle-mounted charger when the state of the electric drive system is a closed state; the vehicle-mounted charger outputs electric energy to the power battery according to the allowable charging command; the power battery receives the electric energy and carries out charging according to the electric energy. By the mode, the vehicle can not enter the driving state in the charging process or when the charging cable is linked, and the vehicle-mounted charging device is effectively prevented from being damaged and causing corresponding electric shock casualties due to misoperation. The technical problem that an existing alternating current charging device has potential safety hazards is solved.
Referring to fig. 4, fig. 4 is a flowchart illustrating a vehicle charging method according to a second embodiment of the present invention.
The vehicle-mounted charging system in the embodiment further comprises a battery management controller in communication connection with the vehicle-mounted charger through a CAN bus;
after step S50, the method further includes:
step S501: and the battery management controller monitors the state of the power battery to obtain the current state information of the power battery, determines expected electric energy information according to the current state information, and sends the expected electric energy information to the vehicle-mounted charger.
The vehicle-mounted charger, the battery management controller and the vehicle control unit realize information interaction through CAN communication, the battery management controller monitors and manages the charging state of the power battery, the battery management controller determines charging voltage and charging current according to the performance of the battery, and expected electric energy information is sent to the vehicle-mounted charger through a CAN bus, so that the vehicle-mounted charger is dynamically controlled; the vehicle controller manages and monitors the states of other relevant parts of the whole vehicle, and dynamically controls the vehicle-mounted charger through the CAN.
Step S502: and the vehicle-mounted charger adjusts the electric energy according to the expected electric energy information and outputs the adjusted electric energy to the power battery.
It should be noted that the vehicle-mounted charger adjusts the output voltage and current according to the instruction issued by the battery management controller. The process of adjusting the electrical energy may include adjusting the charging voltage as well as the charging current.
Step S503: and the power battery receives the adjusted electric energy and charges according to the adjusted electric energy.
Specifically, the vehicle-mounted charging system further comprises a direct current converter connected with the vehicle-mounted charger;
after step S503, the method further includes: the vehicle control unit acquires state information of each port, detects the state information, and sends a forced shutdown instruction to the vehicle-mounted charger and an electric signal to the direct current converter when the state information is abnormal; the direct current converter receives the electric signal and enters a hardware protection state according to the electric signal; and when receiving the forced shutdown instruction, the vehicle-mounted charger enters a forced shutdown state and stops outputting electric energy.
It can be understood that the vehicle-mounted charger has the functions of input overvoltage, input undervoltage, output overvoltage, output undervoltage, output overcurrent, output short circuit/input short circuit, over-temperature of the vehicle-mounted charger, safety isolation protection and the like. The vehicle control unit detects each port, and after the abnormality is detected and the protection triggering condition is met, a forced shutdown instruction is sent to the vehicle-mounted charger, and an electric signal is sent to the direct current converter. The direct current converter controls the power circuit to enter hardware protection, and the machine is ensured to be started again before being recovered to normal. Until abnormal state information is detected to preclude or restart recovery. And the vehicle control unit controls the vehicle-mounted charger to enter a software forced shutdown state.
Specifically, after step S503, the method further includes: the vehicle control unit acquires specification information of the power battery when receiving a slow charging starting signal, determines target power according to the specification information, and sends the target power to the vehicle-mounted charger; and the vehicle-mounted charger determines a target electric energy according to the target power and outputs the target electric energy to the power battery.
It should be noted that, in order to realize slow charging of the power battery, the vehicle control unit designs the matching power according to the specification of the power battery, and sends the matching power as the target power to the vehicle-mounted charger. The slow charging mode is a conduction charging mode, a 220V alternating current power supply is taken from a power grid through a power supply interface of the power supply equipment, alternating current of the power supply equipment is led into the vehicle-mounted charger through the charging plug assembly, and the vehicle-mounted charger converts the alternating current into high-voltage direct current so as to charge the power battery.
Specifically, the vehicle charging interface further comprises an electromagnetic lock control module;
after step S503, the method further includes: the vehicle control unit is also used for sending a forward driving signal to the electromagnetic lock control module when receiving a locking signal of the interface; and the electromagnetic lock control module is used for receiving the forward driving signal and controlling the electromagnetic lock to lock according to the forward driving signal.
The vehicle control unit is also used for sending a reverse driving signal to the electromagnetic lock control module when receiving an interface unlocking signal; the electromagnetic lock control module is also used for receiving the reverse driving signal and controlling the electromagnetic lock to carry out lock releasing operation according to the reverse driving signal.
It can be understood that the vehicle socket is additionally provided with an electromagnetic lock, and the whole vehicle control system controls the upper lock and the lower lock of the electromagnetic lock. The lock signal may be input by a user, for example, the user clicks a lock button. The locking signal can also be triggered by a charging signal, and the basic principle of the electromagnetic lock is that the electromagnetic lock control module drives the lock pin to move forwards and backwards to realize the locking and unlocking functions. The electromagnetic lock driving signal can be direct current 12V and 3A current, and the signal time is less than 0.2S. The electromagnetic lock control module can be an electromagnetic coil, and when the electromagnetic coil obtains a forward driving signal, the lock pin advances to realize the locking function. The lock-down signal may be input by a user, for example, the user clicks a lock-down button. The lock-down signal may be triggered by a charge complete or plug-out signal. When the electromagnetic lock control module obtains a reverse driving signal, the lock pin retreats to realize the lock releasing function.
This embodiment has provided through monitoring power battery's state, real-time adjustment electric energy that charges, and each port state of real-time supervision, guarantee charging process normal operating, provide the mode of charging slowly, ensure charging safety, and it is provided with the electromagnetic lock at the vehicle socket moreover, realize charging cable theftproof, avoid electrocuteeing danger, can make the vehicle charging wire connect the back, can not pull it out easily, ensure car owner property safety, the technical problem of current alternating current charging device existence potential safety hazard has been solved.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.
It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.
In addition, the technical details that are not elaborated in this embodiment may refer to the vehicle-mounted charging system provided in any embodiment of the present invention, and are not described herein again.
Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g. Read Only Memory (ROM)/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (e.g. a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An on-vehicle charging system, characterized in that the on-vehicle charging system includes: the vehicle charging system comprises a vehicle charging interface, a vehicle-mounted charger, a power battery and a vehicle control unit, wherein the vehicle control unit is connected with the vehicle-mounted charger through a CAN (controller area network) bus, and the vehicle charging interface, the vehicle-mounted charger and the power battery are sequentially connected;
the vehicle charging interface is used for sending a charging signal to the vehicle-mounted charger when electric energy is accessed;
the vehicle-mounted charger is used for sending a charging wake-up signal to the vehicle control unit according to the charging signal;
the vehicle control unit is used for detecting the state of the electric drive system when receiving the charging wake-up signal, and sending a charging permission command to the vehicle-mounted charger when the state of the electric drive system is in a closed state;
the vehicle-mounted charger is also used for outputting electric energy to the power battery according to the allowable charging command;
and the power battery is used for receiving the electric energy and charging according to the electric energy.
2. The vehicle-mounted charging system according to claim 1, further comprising a battery management controller communicatively connected to the vehicle-mounted charger via a CAN bus, the battery management controller being connected to the power battery;
the battery management controller is used for monitoring the state of the power battery to obtain the current state information of the power battery, determining expected electric energy information according to the current state information, and sending the expected electric energy information to the vehicle-mounted charger;
the vehicle-mounted charger is further used for adjusting the electric energy according to the expected electric energy information and outputting the adjusted electric energy to the power battery;
and the power battery is also used for receiving the adjusted electric energy and charging according to the adjusted electric energy.
3. The vehicle-mounted charging system according to claim 1, further comprising a dc converter connected to the vehicle-mounted charger, the dc converter being connected to the vehicle control unit;
the vehicle control unit is further configured to acquire state information of each port, detect the state information, send a forced shutdown instruction to the vehicle-mounted charger when the state information is abnormal, and send an electrical signal to the direct-current converter;
the direct current converter is used for receiving the electric signal and entering a hardware protection state according to the electric signal;
and the vehicle-mounted charger is also used for entering a forced shutdown state and stopping outputting electric energy when receiving the forced shutdown instruction.
4. The vehicle-mounted charging system according to claim 1, wherein the vehicle control unit is further configured to obtain specification information of the power battery when a slow charging start signal is received, determine a target power according to the specification information, and send the target power to the vehicle-mounted charger;
and the vehicle-mounted charger is also used for determining target electric energy according to the target power and outputting the target electric energy to the power battery.
5. The vehicle-mounted charging system according to claim 1, wherein the vehicle charging interface further comprises an electromagnetic lock control module, and the electromagnetic lock control module is connected with the vehicle control unit;
the vehicle control unit is also used for sending a forward driving signal to the electromagnetic lock control module when receiving a locking signal of the interface;
and the electromagnetic lock control module is used for receiving the forward driving signal and controlling the electromagnetic lock to lock according to the forward driving signal.
6. The vehicle-mounted charging system according to claim 5, wherein the vehicle control unit is further configured to send a reverse driving signal to the electromagnetic lock control module when receiving an interface lock release signal;
the electromagnetic lock control module is also used for receiving the reverse driving signal and controlling the electromagnetic lock to carry out lock releasing operation according to the reverse driving signal.
7. The vehicle-mounted charging system according to any one of claims 1-6, wherein the vehicle control unit is further configured to switch off a motor driving circuit and send a charging permission command to the vehicle-mounted charger when the electric drive system state is an on state.
8. The vehicle-mounted charging system according to any one of claims 1 to 6, wherein the vehicle-mounted charger is further configured to perform fault diagnosis on the self-state to obtain a fault diagnosis result, and broadcast fault information to the CAN network when the fault diagnosis result indicates that a fault occurs.
9. An in-vehicle charging method, characterized in that the in-vehicle charging method is applied to an in-vehicle charging system according to any one of claims 1 to 8, the in-vehicle charging system comprising: the vehicle charging interface, the vehicle-mounted charger, the power battery and the vehicle control unit;
the vehicle-mounted charging method comprises the following steps:
when the vehicle charging interface is accessed with electric energy, a charging signal is sent to the vehicle-mounted charger;
the vehicle-mounted charger sends a charging wake-up signal to the vehicle control unit according to the charging signal;
the vehicle control unit detects the state of an electric drive system when receiving the charging wake-up signal, and sends a charging permission command to the vehicle-mounted charger when the state of the electric drive system is a closed state;
the vehicle-mounted charger outputs electric energy to the power battery according to the allowable charging command;
and the power battery receives the electric energy and carries out charging according to the electric energy.
10. The vehicle-mounted charging method according to claim 9, wherein the vehicle-mounted charging system further comprises a battery management controller in communication connection with the vehicle-mounted charger through a CAN bus;
the power battery receives the electric energy, and after the step of charging according to the electric energy, the method further comprises:
the battery management controller monitors the state of the power battery to obtain the current state information of the power battery, determines expected electric energy information according to the current state information, and sends the expected electric energy information to the vehicle-mounted charger;
the vehicle-mounted charger adjusts the electric energy according to the expected electric energy information and outputs the adjusted electric energy to the power battery;
and the power battery receives the adjusted electric energy and charges according to the adjusted electric energy.
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Application publication date: 20210302 |