CN113859021B - Vehicle charge and discharge control system, vehicle and method for identifying charge and discharge modes of vehicle - Google Patents

Vehicle charge and discharge control system, vehicle and method for identifying charge and discharge modes of vehicle Download PDF

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Publication number
CN113859021B
CN113859021B CN202010615269.6A CN202010615269A CN113859021B CN 113859021 B CN113859021 B CN 113859021B CN 202010615269 A CN202010615269 A CN 202010615269A CN 113859021 B CN113859021 B CN 113859021B
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China
Prior art keywords
vehicle
charge
charging
mode
unit
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CN202010615269.6A
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Chinese (zh)
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CN113859021A (en
Inventor
龚雨龙
罗建兴
赵颖
石雷
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BYD Co Ltd
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BYD Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • 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
    • B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
    • B60L53/14—Conductive energy transfer
    • 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]
    • 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
    • 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
    • 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
    • Y02T90/12—Electric charging stations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

The invention discloses a vehicle charge and discharge control system, a vehicle and a method for identifying a vehicle charge and discharge mode, wherein the vehicle charge and discharge control system comprises a first resistor unit, a diode unit, a second resistor unit and a vehicle control device, wherein a first end of the first resistor unit is connected with a vehicle body ground; the anode of the diode is connected with the connection control confirmation terminal and the cathode is connected with the second end of the first resistance unit; the second resistance unit and the first resistance unit are connected in parallel; the first detection end of the vehicle control device is connected with the connection confirmation terminal, and a first detection point is arranged between the first detection end and the connection confirmation terminal; the device is used for identifying a charge-discharge mode according to the resistance value between the first detection point and the grounding terminal, wherein the charge-discharge mode comprises an alternating-current charge mode, an alternating-current discharge mode and a direct-current charge mode. The charge-discharge control system and the vehicle can identify the direct current charge mode and the alternating current charge mode without improving the existing hardware, and can reduce the cost.

Description

Vehicle charge and discharge control system, vehicle and method for identifying charge and discharge modes of vehicle
Technical Field
The invention relates to the technical field of vehicles, in particular to a vehicle charge and discharge control system, a vehicle and a method for identifying a vehicle charge and discharge mode.
Background
The main function of the CP circuit in the charging control system is charging connection confirmation and charging state interaction. In the charging connection confirmation stage, the power supply control device judges whether the power supply plug and the power supply socket are completely connected by measuring the voltage between the CP wire and the PE. In the charge preparation phase, the vehicle control device confirms the maximum supply current of the present power supply apparatus by measuring the PWM signal duty ratio between the CP line and the PE. During and after charging, the power supply control device confirms whether high-voltage alternating current is output currently by measuring a voltage signal between the CP wire and the PE, and the vehicle charging controller confirms whether the power supply equipment has a charging condition by measuring a PWM wave signal between the CP wire and the PE.
Along with the popularization of the dual-mode vehicle, the power consumption requirement of the dual-mode vehicle owner is also bigger and bigger, the dual-mode vehicle only has an alternating current charging function at present, the maximum charging power is 3.3KW and 6.6KW, the charging time is long due to the small charging power, the charging cost of the vehicle owner is high, and the reduction of the duty ratio of the alternating current charging pile in the public charging station is also slowly influenced by the comparison of the power difference and the revenue relationship of alternating current charging and direct current charging when an operator decides the type of the charging pile in the charging station.
Even though the charging of the two-mode vehicle is improved in the related art so that the direct-current charging can be satisfied, the modification to the vehicle is large and the cost is high.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present invention is to provide a vehicle charge-discharge control system that can be recognized by a dc power supply device and recognize an ac-dc charge mode without modifying hardware of the vehicle control system.
A second object of the invention is to propose a vehicle.
A third object of the present invention is to provide a method for identifying a charge-discharge mode of a vehicle.
In order to achieve the above object, a vehicle charge and discharge control system according to an embodiment of a first aspect of the present invention includes: the device comprises a first resistor unit, a diode unit and a second resistor unit, wherein the first end of the first resistor unit is respectively connected with the ground of the vehicle body and the grounding terminal, the anode of the diode unit is connected with a connection control confirmation terminal, the cathode of the diode unit is connected with the second end of the first resistor unit, and the second resistor unit is connected with the first resistor unit in parallel; the first detection end of the vehicle control device is connected with the connection confirmation terminal, a first detection point is arranged between the first detection end and the connection confirmation terminal, and the second detection end of the vehicle control device is respectively connected with the second end of the first resistance unit, the second end of the second resistance unit and the cathode of the diode unit; the vehicle control device is used for identifying a charge-discharge mode according to the resistance value between the first detection point and the grounding terminal, wherein the charge-discharge mode comprises an alternating-current charge mode, an alternating-current discharge mode and a direct-current charge mode.
According to the vehicle charge and discharge control system provided by the embodiment of the invention, based on the existing vehicle hardware, the charge and discharge mode is identified by the vehicle control device according to the resistance value between the first detection point and the grounding terminal, the aim of reliably connecting both the alternating current power supply equipment and the direct current power supply equipment can be achieved by multiplexing the alternating current charge control guide circuit, the vehicle control system is not required to be changed in hardware, only the software control strategy is changed, and the cost can be reduced and the development period can be shortened.
In some embodiments, the total resistance of the first resistor unit, the diode unit and the second resistor unit is a vehicle-side charging identification standard resistance during direct current charging, so that charging connection identification of a direct current charging device side can be met by selecting a resistor model, the charging standard is met, and hardware improvement is not needed.
In some embodiments, the vehicle control device is configured to detect that a resistance value between the first detection point and the ground terminal is a dc charging identification resistance value, and determine that the first detection point is the dc charging mode when the charging/discharging mode is identified.
In some embodiments, a second detection point is arranged between the cathode of the diode unit and the second end of the first resistance unit, and the second detection point is connected with the vehicle control device;
when the vehicle control device identifies a charging and discharging mode, the vehicle control device is used for detecting that the resistance value between the first detection point and the grounding terminal is an alternating-current charging identification resistance value and determining that the vehicle control device is in an alternating-current charging mode;
alternatively, the vehicle control device may be configured to detect that a resistance value between the first detection point and the ground terminal is an ac discharge identification resistance value when the charge/discharge mode is identified, and perform the discharge control when the ac discharge mode is identified.
In some embodiments, the vehicle charge-discharge control system further includes a switching unit connected in parallel with the first point resistance unit after being connected in series with the second resistance unit;
the vehicle control device is further configured to control the switching unit according to the charge-discharge mode.
In some embodiments, the vehicle control device is configured to control the switch unit to be turned on when determining the dc charging mode, or to detect that a resistance value between the first detection point and the ground terminal is infinity in the dc charging mode, to control the switch unit to be turned off, or to detect that the power battery level reaches a charging threshold in the dc charging mode, to control the switch unit to be turned off, or to control the switch unit to be turned on when detecting a charging PWM signal in the second detection point when determining the ac charging mode, to perform ac charging.
In order to achieve the above object, a vehicle according to a second aspect of the present invention includes a power battery and the vehicle charge/discharge control system for identifying a charge/discharge mode to perform charge/discharge control on the power battery.
According to the vehicle provided by the embodiment of the invention, the vehicle charge and discharge control system is adopted, and the alternating current charge control guide circuit is multiplexed on the basis of not changing the existing hardware structure, so that alternating current charge identification and direct current charge identification can be realized, and support can be provided for the vehicle to realize alternating current charge and direct current charge.
To achieve the above object, a method for identifying a charge-discharge mode of a vehicle according to an embodiment of a third aspect of the present invention includes: acquiring a resistance value between a first detection point and a grounding terminal; and identifying a charge-discharge mode according to the resistance value between the first detection point and the grounding terminal, wherein the charge-discharge mode comprises an alternating-current charge mode, an alternating-current discharge mode and a direct-current charge mode.
According to the method for identifying the vehicle charging and discharging modes, based on the existing vehicle hardware, the vehicle control device identifies the charging and discharging modes according to the resistance value between the first detection point and the grounding terminal, the aim of reliably connecting both the alternating current power supply equipment and the direct current power supply equipment can be achieved through multiplexing the alternating current charging control guide circuit, hardware change is not needed for a vehicle control system, only a software control strategy is changed, and cost and development period can be reduced.
In some embodiments, identifying a charge-discharge pattern from a resistance value between the first detection point and the ground terminal includes: detecting that the resistance value between the first detection point and the grounding terminal is a direct-current charging identification resistance value, and determining that the resistance value is a direct-current charging mode; or detecting that the resistance value between the first detection point and the grounding terminal is an alternating-current charging identification resistance value, and determining that the alternating-current charging mode is established; or, when the resistance value between the first detection point and the grounding terminal is detected to be an alternating current discharge identification resistance value, and the alternating current discharge mode is determined, the discharge control is performed.
In some embodiments, the method further comprises: when the direct current charging mode is determined, the switch unit is controlled to be closed so as to feed back a feedback signal for completing charging connection to the direct current charging equipment, and then direct current charging can be performed; or when the alternating-current charging mode is determined and the charging PWM signal is detected at the second detection point, controlling the switch unit to be closed so as to perform alternating-current charging; or in the direct-current charging mode, detecting that the resistance value between the first detection point and the grounding terminal is infinite, determining that the direct-current charging adapter is disconnected with the vehicle-mounted alternating-current charging socket, and controlling the switch unit to be disconnected; or in the direct current charging mode, detecting that the electric quantity of the power battery reaches a charging threshold value, and controlling the switch unit to be disconnected.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a block diagram of a vehicle charge-discharge control system according to one embodiment of the invention;
FIG. 2 is a schematic diagram of a DC interface to DC interface charging control steering circuit according to one embodiment of the invention;
FIG. 3 is a schematic diagram of a DC charge control steering circuit;
FIG. 4 is a block diagram of a vehicle according to one embodiment of the invention;
FIG. 5 is a flow chart of a method of identifying a charge-discharge pattern of a vehicle according to one embodiment of the invention;
fig. 6 is a flowchart of a method of identifying a charge-discharge pattern of a vehicle according to another embodiment of the present invention.
Reference numerals:
a vehicle 100;
the vehicle charging and discharging control system 10, the vehicle-mounted alternating-current charging socket 20, the first resistance unit 30, the diode unit 40, the second resistance unit 50, the switch unit 60, and the vehicle control device 70.
Detailed Description
Embodiments of the present invention will now be described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar element numerals refer to like or similar elements having like or similar functions throughout, and wherein the embodiments described with reference to the drawings are exemplary and intended to be illustrative of the present invention and not to be construed as limiting the invention.
The following describes a vehicle charge and discharge control system and a vehicle and a method of recognizing a charge and discharge mode of a vehicle according to an embodiment of the present invention with reference to the accompanying drawings.
Fig. 1 is a block diagram of a vehicle charge and discharge control system according to an embodiment of the present invention, and as shown in fig. 1, a vehicle charge and discharge system 10 according to an embodiment of the present invention includes a first resistance unit 30, a diode unit 40, a second resistance unit 50, a switching unit 60, and a vehicle control device 70.
In the embodiment, the vehicle charge-discharge control system 10 is connected to the vehicle-mounted ac charging socket 20 of the vehicle, and when the vehicle-mounted ac charging socket 20 is in physical connection with the ac charging device during ac charging, the vehicle-mounted ac charging socket 20 is in physical connection with the dc charging device through a charge transfer adapter, as shown in fig. 2, and the charge transfer adapter is used for transferring dc power to the vehicle-mounted ac charging socket 20, so that the dc charging of the vehicle is realized through power distribution control in the vehicle.
The in-vehicle ac charging receptacle 20 of the vehicle is provided as a device capable of physically connecting with external charging equipment, and includes at least a ground terminal for connection with the vehicle body, a connection confirmation terminal, and a connection control confirmation terminal. The connection confirmation terminal is used for connecting with a connection confirmation terminal in the direct-to-alternating-current charging adapter when the vehicle is charged with direct current or connecting with a connection confirmation terminal in the alternating-current charging device when the vehicle is charged with alternating current, and the connection confirmation terminal mainly serves to confirm reliable connection between the vehicle-mounted alternating-current socket 20 and the direct-to-alternating-current charging adapter or the alternating-current charging device during direct-current or alternating-current charging of the vehicle and send confirmation of reliable connection to the vehicle control device 70. The connection control confirmation terminal is used for connecting with a connection control confirmation terminal in the direct-to-alternating-current charging adapter when the vehicle is subjected to direct-current charging or connecting with a connection control confirmation terminal in the alternating-current charging equipment when the vehicle is subjected to alternating-current charging, and the connection control confirmation terminal mainly serves to confirm reliable connection between the vehicle-mounted alternating-current socket 20 and the direct-to-alternating-current charging adapter or the alternating-current charging equipment during direct-current or alternating-current charging of the vehicle and send a signal of the reliable connection to the vehicle control device 70.
The first resistor unit 30 is provided in the vehicle charge/discharge control system 10 and is mainly composed of resistors, and a first end of the first resistor unit 30 is connected to the vehicle body ground and the ground terminal, respectively, and a second end of the first resistor unit 30 is connected to the diode unit 40 and the second detection end of the vehicle control device 70, respectively. After the external charging device and the vehicle-mounted ac charging socket are physically connected during the charging process, current flows into and out of the first end from the second end of the first resistance unit 30 to form a closed loop, for example, during the direct-transfer charging process, it is determined that the vehicle-mounted ac charging socket 20, the direct-transfer charging adapter and the direct-current charging device are sequentially connected, a total resistance value of a resistor in the closed loop formed by the first resistance unit 30 and the direct-current charging device can be detected by the vehicle control device 70 and a direct-current charging mode can be determined, for example, during the alternating-current charging process, it is determined that the vehicle-mounted ac charging socket 20 and the alternating-current charging device are sequentially connected, and a total resistance value of a resistor in the closed loop formed by the first resistance unit 30 and the alternating-current charging device can be detected by the vehicle control device 70 and an alternating-current charging mode can be determined, so that an alternating-current charging mode or a direct-current charging mode of the vehicle can be determined.
The diode unit 40 is provided between the connection control confirmation terminal and the first resistor unit 30 in the vehicle charge-discharge system 10, the anode of the diode 40 is connected to the connection control confirmation terminal, the cathode of the diode 40 is connected to the second end of the first resistor unit 30, and during charging of the vehicle, current flows in from the anode of the diode 40 and out from the cathode.
The second resistor unit 50 and the switch unit 60 are connected in series and then connected in parallel with the first resistor unit 30, the switch unit 60 can control the on-off condition of the current in the second resistor unit 50, the switch unit 60 can be opened or closed by the vehicle control device 70, for example, the switch unit 60 is closed, the branch where the second resistor unit 50 is located is conducted, the current flows in from the first end of the second resistor unit 50 and flows out from the second end of the switch unit 60, the switch unit 60 is opened, and the branch where the second resistor unit 50 is located cannot be conducted. The on/off of the switch unit 60 may also be used as an execution switch for entering the charge state or ending the energization state, for example, the switch unit 60 is turned on to determine that the vehicle enters the charge state, and the switch unit 60 is turned off to determine that the vehicle ends the charge state.
In an embodiment, according to the national standard GB/T18487.1-2015 annex a ac control guidance schematic and annex B dc control guidance schematic, the dc power supply device is connected to the vehicle ac charging socket through a charging adapter, where the CC1 loop in the dc charging control guidance schematic is connected to the CP loop of the ac charging control guidance schematic, as shown in fig. 3. In order to feed back the identification resistor which is already reliably connected to the dc charging device side, the vehicle side needs to provide an equivalent resistance value when the dc charging device side is directly charged, in this embodiment of the present invention, after the physical connection of the dc charging device, the charging adapter and the vehicle ac charging socket 20 is completed, the vehicle ac charging control system 10 needs to provide an equivalent resistance to identify the dc charging device side, so in this embodiment of the present invention, in order to multiplex the interface of the vehicle ac charging socket 20 to implement dc charging, the total resistance formed by the first resistor unit 30, the second resistor unit 50 and the diode unit 40 is used to feed back to the dc charging device side for the dc charging device side to identify the connection state. That is, in some embodiments, the total resistance of the first resistance unit 30, the diode unit 40, and the second resistance unit 50 is the vehicle-side charge identification standard resistance at the time of direct current charging. For example, the voltage drop of the diode unit 40 is 0.7V, the resistance value of the first resistor unit 30 is 2740Ω, the resistance value of the second resistor unit 50 is 1300Ω, and the circuit formed by connecting the three components as shown in fig. 1 is equivalent to 1kΩ, so that the standard requirement is met, and the vehicle end does not need to be modified by hardware, thereby reducing the cost.
The first detection terminal of the vehicle control device 70 is connected to the connection confirmation terminal CC1, and a first detection point, for example, a detection point 3 in fig. 1, is provided between the first detection terminal and the connection confirmation terminal, and a specific resistance is provided between the first detection point and the ground terminal PE, so that the vehicle control device 70 can recognize that the recognition resistance value is different in different charging modes according to national standards, and the mode can be determined by recognizing the resistance value.
The vehicle control device 70 is configured to identify a charge-discharge mode based on a resistance value between a first detection point, for example, a detection point 3 in the drawing, and a ground terminal PE, wherein the charge-discharge mode includes an ac charge mode, an ac discharge mode, and a dc charge mode.
The mode can be determined by identifying different resistance values according to national standard rules when different charging modes are performed, for example, the resistance value between the first detection point and the grounding terminal is obtained to be a direct current charging identification resistance value, the vehicle-mounted alternating current charging socket, the direct current charging adapter and the direct current charging equipment are sequentially connected to be determined to be a direct current charging mode, or the resistance value between the first detection point and the grounding terminal is obtained to be an alternating current charging identification resistance value, the vehicle can identify the alternating current charging mode, for example, the resistance value between the first detection point and the grounding terminal is obtained to be an alternating current discharging identification resistance value, and the vehicle is controlled to be an alternating current discharging mode. The identification resistance of each mode may be set according to the charging standard requirement, and the resistance value of the resistance unit in the charge-discharge control system 10 according to the embodiment of the present invention is determined.
According to the vehicle charging and discharging system 10 of the embodiment of the invention, on the basis of not changing the hardware of the vehicle control system, the vehicle control device 70 can determine the mode by identifying the resistance value, and control the charging and discharging mode by controlling the on-off of the switch unit 60, so that the cost can be reduced in the production process, the development period is shortened, and the charging process of direct current to alternating current is completed at the same time.
Further, the vehicle control device 70 is also configured to control the switching unit 60 according to the charge-discharge mode. For example, when the vehicle control device 70 is configured to control the switch unit, when determining the dc charging mode, the vehicle control device is configured to control the switch unit 60 to be closed without determining whether the second detection point receives the PWM signal, so as to feed back a feedback signal to the dc charging device that the charging connection is completed, and then perform the dc charging; or, in the dc charging mode, the resistance value between the first detection point and the ground terminal is detected to be infinity, it is determined that the dc-ac charging adapter is disconnected from the vehicle-mounted ac charging socket 20, and the control switch unit is turned off; or, the control switch unit is used for detecting that the electric quantity of the power battery reaches a charging threshold value in a direct current charging mode, or is used for controlling the switch unit to be closed when the charging PWM signal is detected at a second detection point in determining an alternating current charging mode so as to feed back a charging permission signal to the alternating current charging equipment, and the subsequent alternating current charging equipment can perform alternating current charging.
Fig. 2 is a schematic diagram of a charge control and steering circuit for a dc interface to ac interface, and a charge and discharge control system 10 according to an embodiment of the present invention is described below with reference to fig. 2.
As shown in fig. 2, the switch unit 60 controlled by the vehicle charging and discharging system 10 may be configured as a switch S2, the first detection point may be configured as a detection point 3, the ground terminal may be configured as a PE terminal, the first resistor unit 30 may be configured as a resistor R3', the second resistor unit 50 may be configured as a resistor R2' and connected in series with the switch S2, and controlled by the switch S2, the connection confirmation terminal may be configured as a CC terminal, the CC terminal is connected to the CC port in the charging adapter, and the connection control confirmation terminal may be configured as a CP terminal, and during the dc charging, the CP port of the vehicle ac charging interface is connected to the dc power supply device through the adapter, wherein the CC1 circuit in the dc charging device and the CP circuit of the ac charging socket form a closed circuit after being reliably connected, and the CP circuit functions as a signal for the vehicle charging and discharging system 10 to identify whether the dc vehicle plug is reliably connected to the socket.
In the embodiment of the present invention, as shown in fig. 2, the switch unit 60 controlled by the vehicle charging and discharging system 20, that is, the switch S2, the ground terminal, that is, the PE port, may be connected to the ground terminal in the direct-to-direct-current charging adapter, that is, the PE port, and the vehicle charging and discharging system 20 is disposed in the vehicle, and may identify the charging and discharging mode and control the switch S2, and after determining that the vehicle-mounted ac charging socket, the direct-to-direct-current charging adapter, and the direct-current charging device are reliably connected, the resistance value between the detection point 3 and the ground PE port is the direct-current charging identification resistance value, and the direct-current charging identification resistance value is the resistance value which is specially set according to national standard, and then is determined to be the direct-current charging mode, and the switch S2 is controlled to be closed, so that the feedback signal fed back to the completion of charging connection of the direct-current charging device may be performed subsequently.
In the embodiment of the present invention, as shown in fig. 2, when the vehicle control device 20 recognizes the charge/discharge mode and controls the switch unit 60, that is, the switch S2, for example, in the dc charging mode, it detects that the resistance value between the first detection point, that is, the detection point 3, and the ground terminal, that is, the PE port is infinity, for example, it determines that the direct-to-direct-charge adapter is disconnected from the vehicle-mounted ac charging socket, or that the direct-to-direct-charge adapter is disconnected from the dc charging device, and the vehicle control device 10 controls the S2 to be disconnected to feed back to the dc charging device side, and further, the dc charging device side stops the dc charging control, and ends the dc charging mode.
In the embodiment of the present invention, as shown in fig. 2, when the vehicle control device 20 recognizes the charge-discharge mode and controls the switch unit, that is, the switch S2, for example, in the dc charging mode, it is determined that the charging is completed when detecting that the power battery level reaches the charging threshold, for example, the charging threshold may be set to 100%, and the vehicle control device 20 controls the switch S2 to be turned off, ending the dc charging mode.
In the embodiment of the present invention, as shown in fig. 2, the anode of the diode 40, i.e., the diode D1, is connected to the connection confirmation terminal of the vehicle ac outlet 20, the connection confirmation terminal may be set as the CP terminal, a second detection point is provided between the cathode of the diode unit D1 and the second end of the first resistor unit 30, i.e., the resistor R3', the second detection point may be set as the detection point 2 and the detection point 2 is connected to the vehicle control device 70, and the detection point 2 may detect a charge or discharge signal when the current is conducted to form a loop after the circuit is physically connected and may transmit the charge or discharge signal to the vehicle control device 70. For example, when the vehicle control device 70 recognizes the charge/discharge mode and controls the switch unit 60, i.e., the switch S2, and detects that the resistance value between the first detection point, i.e., the detection point 3, and the ground terminal PE is the ac charge recognition resistance value, it is possible to determine that the vehicle is in the ac charge mode, and when the vehicle control device 70 determines that the vehicle is in the ac charge mode and detects the charge signal, it is possible to determine that the vehicle is in the ac charge mode, and transmit the charge signal to the vehicle control device 70, and when the vehicle control device determines that the vehicle is in the ac charge mode, it is possible to control the switch unit 60, i.e., the switch S2 to be closed, and the vehicle to open the ac charge. For another example, when the vehicle control device 70 recognizes the charge/discharge mode and controls the switch S2, which is the switch unit 60, it is possible to determine that the resistance value between the first detection point, i.e., the detection point 3, and the ground terminal PE is the ac discharge recognition resistance value, and the vehicle control device 70 recognizes that the discharge signal is detected at the detection point 2 and transmitted to the vehicle control device 70, and when the vehicle control device 70 determines that the vehicle is in the ac discharge mode and the discharge signal is detected, the discharge control is performed.
Fig. 3 is a schematic diagram of a dc charge control steering circuit. As shown in fig. 3, if the direct current charging device directly charges the direct current charging socket of the vehicle, the vehicle plug in the direct current charging device is linked with the direct current vehicle socket, the CC1 loop in the direct current charging device is used as a signal for identifying whether the direct current vehicle plug is reliably connected with the socket by the direct current power supply device, when the direct current vehicle plug is connected with the socket, a resistor R2 with a resistance value of 1kΩ can be arranged in the direct current vehicle plug, a resistor R4 with a resistance value of 1kΩ can be arranged in the vehicle socket, a detection point 1 can be arranged in the direct current charging device and used for detecting a voltage value in a circuit, and in the direct current charging process, the voltage of the detection point 1 is changed into 4V which is commonly divided by R2 and R4 through the voltage divided by R2, namely the direct current power supply device can identify that the direct current vehicle plug is reliably connected with the socket, and the direct current charging device is used for charging. However, the existing charging sockets of the dual-mode automobile and the existing charging sockets of the electric automobile are both alternating-current charging sockets, a guide circuit in the automobile is required to be changed and set to be the same as the R4 resistance value in the charging socket of the direct-current automobile to identify the direct-current power supply device in the direct-current to alternating-current charging process, and the hardware change can cause the increase of the research and development cost and the extension of the development period in the research and development process.
The vehicle charging and discharging system 10 according to the embodiment of the present invention is different from the prior art in that the hardware and the circuit of the vehicle provided with the ac charging socket do not need to be changed, the resistor R4 in the dc charging socket of the vehicle may be replaced by an equivalent circuit in the ac charging control system of the vehicle, and according to the circuit analysis in fig. 3, the equivalent circuit may be composed of the diode D1, the resistor R3' and the resistor R2' in the original charging control guiding circuit, the voltage drop of the diode D1 may be set to 0.7V, the resistor of the resistor R3' may be set to 2740 Ω, the resistor of the resistor R2' may be set to 1300 Ω, the equivalent circuit may be equivalent to 1kΩ resistor, and the dc power supply device may be identified, so that dc power supply is performed to the vehicle and the S2 control strategy is added, and the vehicle may be controlled in different modes by controlling the on-off of the resistor R2' through the switch S2. Hardware change of a vehicle control system is not needed, so that the cost is reduced, and the development period is shortened.
Fig. 4 is a block diagram of a vehicle according to an embodiment of the present invention, and as shown in fig. 4, a vehicle 100 of an embodiment of the present invention includes a power battery 90 and a vehicle charge-discharge control system 10, the vehicle charge-discharge control system 10 being configured to recognize a charge-discharge mode to perform charge-discharge control of the power battery.
In the process of charging preparation of the vehicle, the vehicle charging and discharging system is subjected to connection confirmation of an external charging device and recognition confirmation of a charging mode, the control switch unit is closed to charge the power battery of the vehicle, for example, in a direct-current charging mode, the direct-current charging device can directly supply power to the power battery through the direct-current charging adapter, when the electric quantity of the power battery reaches a charging threshold or the direct-current charging adapter is determined to be disconnected from a vehicle-mounted alternating-current charging socket, the vehicle charging and discharging system control switch unit 60 is opened to finish charging, or after the vehicle charging and discharging system recognizes and confirms the discharging state of the vehicle, the power battery is controlled to discharge. In the process of charging and discharging the power battery of the vehicle, particularly when the direct current power supply device identifies and starts the direct current charging process, the direct current-to-alternating current charging effect can be achieved without changing the connection condition of the power battery and surrounding hardware.
The method for identifying a vehicle charge-discharge mode according to the embodiment of the present invention acts on the vehicle charge-discharge system 10 according to the embodiment of the present invention, as shown in fig. 5, and includes at least steps S1 and S2.
S1, acquiring a resistance value between a first detection point and a grounding terminal.
S2, identifying a charging and discharging mode according to the resistance value between the first detection point and the grounding terminal, wherein the charging and discharging mode comprises an alternating current charging mode, an alternating current discharging mode and a direct current charging mode.
Specifically, a resistance value between the first detection point, i.e., the detection point 3, and the ground terminal PE is obtained, the detected resistance value may include a total resistance value of a circuit composed of the diode 40, the first resistance unit 30, and the second resistance unit 50, and a charge-discharge mode is identified based on the detected resistance value, thereby controlling the switching unit 60, wherein the charge-discharge mode includes an ac charge mode, an ac discharge mode, and a dc charge mode. For example, when the direct-to-alternating-current charging adapter is plugged into the vehicle ac socket, the vehicle control device 70 can recognize and close S2 to perform direct-current charging on the vehicle, when the vehicle charging is completed or the direct-to-alternating-current charging adapter is plugged out of the vehicle ac socket, the vehicle control device 70 can recognize and disconnect S2 to end the direct-current charging, when the alternating-current charging device is connected with the vehicle ac socket, the vehicle control device 70 can recognize and close S2 to perform alternating-current charging on the vehicle, and when the vehicle is in the discharging mode, the vehicle control device 70 can perform discharging control on the vehicle and can be applied to all vehicles with alternating-current charging functions.
In the embodiment of the present invention, the charge and discharge mode is identified according to the resistance value between the first detection point, i.e., the detection point 3, and the ground terminal PE port, and the switching unit 60 is controlled according to the charge and discharge mode.
Fig. 6 is a flowchart of a method of identifying a charging mode of a vehicle according to an embodiment of the present invention, as shown in fig. 6, including at least the following steps S401-S4012.
S401, a vehicle charging controller, namely a vehicle control device, is used for receiving and identifying a connection signal, detecting and identifying a resistance value, determining a mode and controlling on-off of a switch unit under the condition that a vehicle-mounted alternating current charging socket, a direct current charging adapter and direct current charging equipment are sequentially connected when the vehicle is in a charging preparation state.
S402, detecting the resistance of the detection point 3, detecting the resistance value between the detection point 3 and the grounding terminal by the vehicle charging controller, judging the detected resistance value and determining a mode, and determining the vehicle charging controller as the direct current charging mode if the detected resistance value is the resistance value in the direct current charging mode.
S403, the direct current charge identification resistance value is determined to be a direct current charge mode by the vehicle charge controller.
And S404, closing the switch S2, controlling the switch unit to be closed by the vehicle charging controller after receiving the direct current charging signal of the detection point 2, feeding back a feedback signal for completing the charging connection of the direct current charging equipment, and then carrying out direct current charging on the vehicle.
S405, the direct current charging process, the direct current charging equipment, the direct current-to-direct current charging adapter and the vehicle-mounted alternating current socket are reliably connected and perform direct current charging on the vehicle.
S406, judging whether the resistance of the detection point 3 is infinite, and the vehicle charging controller detects the resistance value between the detection point 3 and the grounding terminal PE port and judges the resistance value. If the resistance is infinite, it may be determined that the direct-current charging adapter is disconnected from the vehicle-mounted ac charging socket, step S408 is performed, and the direct-current charging is terminated. If the resistance is not infinite, it may be determined that the direct-to-direct-current charging adapter is not disconnected from the vehicle-mounted alternating-current charging socket, step S407 is performed, and the direct-current charging state is maintained.
S407, judging whether the charging threshold reaches 100%. The vehicle charge controller determines whether the available electric quantity in the power battery reaches a charge threshold, the charge threshold may be set to 100%, if the charge threshold is reached, it is confirmed that the power battery is full, step S408 is performed, the direct current charge is ended, and if the charge threshold is not reached, step S406 is repeatedly performed, and the direct current charge state is maintained.
The invention realizes the real-time monitoring of the whole circuit in the direct current charging process, can judge the charging and discharging states, and controls the charging and discharging states of the vehicle through the control switch S2.
S408, the switch S2 is turned off, the direct-current charging state is ended, and the charging preparation state is returned.
In the embodiment of the present invention, the vehicle charge controller may identify the charge-discharge mode according to the resistance value between the first detection point 3 and the ground terminal when the vehicle is in the charge-ready state, and control the switching unit according to the charge-discharge mode. If the step S402 is performed, the vehicle charge controller may determine that the ac charge mode is the ac charge mode according to the resistance value between the first detection point 3 and the ground terminal being the resistance value in the ac charge mode.
S409, the alternating-current charging identification resistor and the vehicle charging controller determine an alternating-current charging mode.
S4010, in the alternating-current charging process, the vehicle charging controller controls the switch unit to be closed after receiving the alternating-current charging signal of the detection point 2, and feeds back a feedback signal for completing charging connection of the alternating-current charging equipment, and then the vehicle can be subjected to alternating-current charging.
In the embodiment of the present invention, the vehicle charge controller may identify the charge-discharge mode according to the resistance value between the first detection point 3 and the ground terminal when the vehicle is in the charge-ready state, and control the switching unit according to the charge-discharge mode. If the step S402 is performed, the vehicle charge controller may determine that the ac discharge mode is the ac discharge mode according to the resistance value between the first detection point 3 and the ground terminal being the resistance value in the ac discharge mode.
S4011, the ac discharge identifies a single group, and the vehicle charge controller determines an ac discharge mode.
S4012, an ac discharge flow, and the vehicle charge controller performs discharge control on the circuit after receiving the ac discharge signal of the detection point 2.
The vehicle charging and discharging system, the vehicle and the method for identifying the vehicle charging and discharging mode can identify the charging and discharging mode including an alternating current charging mode, an alternating current discharging mode and a direct current charging mode. And the switch unit is controlled according to the charge-discharge mode to realize the charge and discharge of the vehicle, especially in the process of direct current charge of the vehicle, the vehicle control system can be identified by the direct current power supply device and the direct current charge process can be started under the condition that hardware is not changed, the hardware change of the vehicle control system is not needed, the cost is reduced, the development period is shortened, and the vehicle charging control system is suitable for all vehicles with alternating current charge functions.
Embodiments of the present invention will be described in detail below, by way of example with reference to the accompanying drawings.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (9)

1. A vehicle charge-discharge control system, characterized by comprising:
the device comprises a first resistor unit, a diode unit and a second resistor unit, wherein the first end of the first resistor unit is respectively connected with the ground terminal and the grounding terminal of the vehicle body, the anode of the diode unit is connected with the connection control confirmation terminal, the cathode of the diode unit is connected with the second end of the first resistor unit, and the second resistor unit is connected with the first resistor unit in parallel;
the first detection end of the vehicle control device is connected with the connection confirmation terminal, a first detection point is arranged between the first detection end and the connection confirmation terminal, and the second detection end of the vehicle control device is respectively connected with the second end of the first resistance unit, the second end of the second resistance unit and the cathode of the diode unit;
the vehicle control device is used for identifying a charging and discharging mode according to the resistance value between the first detection point and the grounding terminal, wherein the charging and discharging mode comprises an alternating current charging mode, an alternating current discharging mode and a direct current charging mode;
when the vehicle control device identifies a charging and discharging mode, the vehicle control device is used for detecting that the resistance value between the first detection point and the grounding terminal is a direct-current charging identification resistance value and determining the resistance value as the direct-current charging mode;
or, when the vehicle control device identifies the charging/discharging mode, the vehicle control device is configured to detect that the resistance value between the first detection point and the ground terminal is an ac charging identification resistance value, and determine that the vehicle control device is in the ac charging mode;
alternatively, the vehicle control device may be configured to detect that a resistance value between the first detection point and the ground terminal is an ac discharge identification resistance value when the charge/discharge mode is identified, and perform the discharge control when the ac discharge mode is identified.
2. The vehicle charge-discharge control system according to claim 1, wherein a total resistance value of the first resistance unit, the diode unit, and the second resistance unit is a vehicle-side charge identification standard resistance value at the time of direct current charging.
3. The vehicle charge-discharge control system according to claim 1, wherein a second detection point is provided between the cathode of the diode unit and the second end of the first resistance unit, the second detection point being connected to the vehicle control device.
4. A vehicle charge and discharge control system according to any one of claims 1 to 3, characterized in that,
the vehicle charge-discharge control system further comprises a switch unit, wherein the switch unit is connected with the second resistance unit in series and then connected with the first resistance unit in parallel;
the vehicle control device is further configured to control the switching unit according to the charge-discharge mode.
5. The vehicle charge-discharge control system according to claim 4, wherein the vehicle control means, when controlling the switching unit, is configured to control the switching unit to be closed when determining a direct current charging mode, or is configured to detect that a resistance value between the first detection point and the ground terminal is infinity in the direct current charging mode, to control the switching unit to be opened, or is configured to detect that a power battery level reaches a charging threshold in the direct current charging mode, to control the switching unit to be opened, or is configured to control the switching unit to be closed when detecting a charging PWM signal in a second detection point when determining an alternating current charging mode.
6. A vehicle comprising a power battery and the vehicle charge-discharge control system according to any one of claims 1 to 5, the vehicle charge-discharge control system being configured to recognize a charge-discharge pattern to perform charge-discharge control on the power battery.
7. A method of identifying a charge-discharge pattern of a vehicle for use in the vehicle of claim 6, the method comprising:
acquiring a resistance value between a first detection point and a grounding terminal;
and identifying a charge-discharge mode according to the resistance value between the first detection point and the grounding terminal, wherein the charge-discharge mode comprises an alternating-current charge mode, an alternating-current discharge mode and a direct-current charge mode.
8. The method of identifying a charge-discharge pattern of a vehicle according to claim 7, characterized in that identifying a charge-discharge pattern based on a resistance value between the first detection point and the ground terminal includes:
detecting that the resistance value between the first detection point and the grounding terminal is a direct-current charging identification resistance value, and determining that the resistance value is a direct-current charging mode;
or detecting that the resistance value between the first detection point and the grounding terminal is an alternating-current charging identification resistance value, and determining that the alternating-current charging mode is established;
or, when the resistance value between the first detection point and the grounding terminal is detected to be an alternating current discharge identification resistance value, and the alternating current discharge mode is determined, the discharge control is performed.
9. The method of identifying a charge-discharge pattern of a vehicle according to claim 8, wherein the vehicle charge-discharge control system of the vehicle includes a first resistance unit, a diode unit, a second resistance unit, and a switch unit having a second detection point therebetween, the switch unit being connected in parallel with the first resistance unit after being connected in series with the second resistance unit, the method further comprising:
when the direct current charging mode is determined, the switch unit is controlled to be closed so as to conduct direct current charging;
or when the alternating-current charging mode is determined and the charging PWM signal is detected at the second detection point, controlling the switch unit to be closed so as to perform alternating-current charging;
or in the direct current charging mode, detecting that the resistance value between the first detection point and the grounding terminal is infinite, and controlling the switch unit to be disconnected;
or in the direct current charging mode, detecting that the electric quantity of the power battery reaches a charging threshold value, and controlling the switch unit to be disconnected.
CN202010615269.6A 2020-06-30 2020-06-30 Vehicle charge and discharge control system, vehicle and method for identifying charge and discharge modes of vehicle Active CN113859021B (en)

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