CN112277727A - Charging control circuit and charging control method - Google Patents
Charging control circuit and charging control method Download PDFInfo
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- CN112277727A CN112277727A CN202011138768.7A CN202011138768A CN112277727A CN 112277727 A CN112277727 A CN 112277727A CN 202011138768 A CN202011138768 A CN 202011138768A CN 112277727 A CN112277727 A CN 112277727A
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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
-
- 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
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/54—Drive Train control parameters related to batteries
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- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- 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 discloses a charging control circuit and a charging control method, wherein the control circuit comprises: a low-voltage battery; the wake-up relay comprises a normally open contact and a relay coil, wherein one end of the normally open contact and one end of the relay coil are both connected with the low-voltage storage battery; the wake-up signal input end of the DC-DC module is connected with the other end of the normally open contact, and the output end of the DC-DC module is connected with the low-voltage storage battery; the wake-up signal input end of the vehicle control unit is connected with the other end of the normally open contact, and the vehicle control unit is also connected with the DC-DC module; and the BMS control unit is connected with the other end of the relay coil, is awakened when receiving the trigger signal sent by the quick charging pile, and awakens the whole vehicle controller and the DC-DC module through the awakening relay, and the whole vehicle controller controls the DC-DC module to output preset voltage to supply power for the low-voltage storage battery. The charging control circuit can enable the low-voltage system of the DC12V of the electric automobile to be charged by using DC12V and DC24V quick-charging piles.
Description
Technical Field
The invention relates to the technical field of automobile control, in particular to a charging control circuit and a charging control method.
Background
With the continuous development and growth of the pure electric vehicles, the requirement for quick charging of the pure electric vehicles is a basic requirement of users. At present, a direct-current quick-charging pile in the market is generally DC12V or DC24V, and if a pure electric vehicle adopts a DC12V low-voltage system, the direct-current quick-charging pile is not matched with the direct-current quick-charging pile DC24V and cannot be charged. In addition, when the pure electric vehicle DC12V low-voltage system is charged through the direct-current quick charging pile DC24V, the vehicle-mounted electric appliances such as a high-voltage contactor or a low-voltage relay are easy to damage due to long-term work under high power, and the danger problem caused by high-voltage accidents is easy to cause.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the first purpose of the present invention is to provide a charging control circuit, which can effectively avoid the problem that the pure electric vehicle DC12V cannot be charged due to the mismatch between the low-voltage system and the DC quick-charging post DC24V and the danger caused by the high-voltage accident.
A second object of the present invention is to provide a charge control method.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a charge control circuit for an electric vehicle, the charge control circuit including: a low-voltage battery; the wake-up relay comprises a normally open contact and a relay coil, and one end of the normally open contact and one end of the relay coil are both connected with the low-voltage storage battery; the wake-up signal input end of the DC-DC module is connected with the other end of the normally open contact, and the output end of the DC-DC module is connected with the low-voltage storage battery; the wake-up signal input end of the vehicle control unit is connected with the other end of the normally open contact, and the vehicle control unit is also connected with the control end of the DC-DC module; the BMS control unit is connected with the other end of the relay coil and used for being awakened when receiving a trigger signal sent by a quick charging pile, controlling the normally open contact to be closed through the relay coil so as to awaken the vehicle control unit and the DC-DC module, and controlling the DC-DC module to work through the vehicle control unit so as to enable the DC-DC module to output preset voltage to supply power for the low-voltage storage battery.
According to the charging control circuit provided by the embodiment of the invention, the BMS control unit is awakened through the auxiliary power supply provided by the quick charging pile, and the whole vehicle controller and the DC-DC module are awakened through the BMS control unit, so that the whole vehicle controller controls the DC-DC module to output the preset voltage to supply power to the low-voltage storage battery, and therefore, the dangerous problems that the pure electric vehicle DC12V low-voltage system is not matched with the direct-current quick charging pile DC24V, the charging cannot be carried out, and the high-voltage accident can cause danger can be effectively avoided.
In order to achieve the above object, a second aspect of the present invention provides a charging control method for the above charging control circuit, including: when charging connection is established between the quick charging pile and the electric automobile, the BMS control unit is awakened through an auxiliary power supply provided by the quick charging pile; the BMS control unit controls the normally open contact to be closed through the relay coil so as to wake up the vehicle control unit and the DC-DC module; the BMS control unit controls the DC-DC module to work through the vehicle control unit, so that the DC-DC module outputs preset voltage to supply power to the low-voltage storage battery.
According to the charging control method provided by the embodiment of the invention, the BMS control unit is awakened through the auxiliary power supply provided by the quick charging pile, and the whole vehicle controller and the DC-DC module are awakened through the BMS control unit, so that the whole vehicle controller controls the DC-DC module to output the preset voltage to supply power to the low-voltage storage battery, and therefore, the dangerous problems that the pure electric vehicle DC12V low-voltage system is not matched with the direct-current quick charging pile DC24V, the charging cannot be carried out, and the high-voltage accident can cause danger can be effectively avoided.
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
Fig. 1 is a block diagram showing a configuration of a charge control circuit according to a first embodiment of the present invention;
fig. 2 is a circuit diagram of a charge control circuit according to a specific example of the present invention;
fig. 3 is a block diagram of a charge control circuit according to a second embodiment of the present invention;
fig. 4 is a block diagram showing a configuration of a charge control circuit according to a third embodiment of the present invention;
fig. 5 is a block diagram of a charge control circuit according to a fourth embodiment of the present invention;
fig. 6 is a flowchart of the operation of a charge control circuit according to a specific example of the present invention;
fig. 7 is a flowchart of a charging control method according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
With the continuous development and growth of the pure electric vehicles, the requirement for quick charging of the pure electric vehicles is a basic requirement of users. At present, a direct-current quick-charging pile in the market is generally DC12V or DC24V, and if a pure electric vehicle adopts a DC12V low-voltage system, the direct-current quick-charging pile is not matched with the direct-current quick-charging pile DC24V and cannot be charged. In addition, when the pure electric vehicle DC12V low-voltage system is charged through the direct-current quick charging pile DC24V, the vehicle-mounted electric appliances such as a high-voltage contactor or a low-voltage relay are easy to damage due to long-term work under high power, and the danger problem caused by high-voltage accidents is easy to cause. In view of the above, the present application provides a charge control circuit and a charge control method that can effectively avoid the above-described problems.
A charge control circuit and a charge control method of an embodiment of the present invention are described below with reference to the drawings.
Fig. 1 is a block diagram of a charge control circuit according to an embodiment of the present invention. Referring to fig. 1, the charge control circuit 100 includes a low-voltage Battery 101, a wake-up relay 102, a DC-DC module 103, a vehicle control unit 104, and a BMS (Battery Management System) control unit 105.
The wake-up relay 102 includes a normally open contact and a relay coil, and as shown in fig. 2, both the end a2 of the normally open contact and the end b2 of the relay coil are connected to the low-voltage battery 101; the end of a wake-up signal input end d1 of the DC-DC module 103 is connected with the end a1 of the normally open contact, and the end of an output end d2 of the DC-DC module 103 is connected with the low-voltage storage battery 101; the end e1 of the wake-up signal input end of the vehicle control unit 104 is connected with the end a1 of the normally open contact, and the end e2 of the vehicle control unit 104 is connected with the end d3 of the control end of the DC-DC module 103; the BMS control unit 105 is connected with the b1 end of the relay coil and used for being awakened when receiving a trigger signal sent by the quick charging pile, controlling the normally open contact to be closed through the relay coil so as to awaken the vehicle control unit 104 and the DC-DC module 103, and controlling the DC-DC module 103 to work through the vehicle control unit 104 so as to enable the DC-DC module 103 to output a preset voltage to supply power to the low-voltage storage battery 101, wherein the preset voltage is direct current 12V voltage.
Specifically, the BMS control unit 105 wakes up upon receiving a trigger signal sent by the fast-charging post, which may include a DC12V voltage signal and may also include a DC24V voltage signal, i.e., the BMS control unit 105 of the present invention may be compatible with the DC12V and DC24V wake-up signals. After the BMS control unit 105 is awakened, it may check information with the fast-charging pile, and the BMS control unit 105 may determine whether the auxiliary power voltage in the fast-charging pile is DC12V or DC24V, so as to select a corresponding mode for operation. After the verification is passed, BMS controlling unit 105 starts the charging operation.
The wake-up relay 102 is a DC12V low voltage system relay, and as shown in fig. 2, when the wake-up relay 102 receives a control signal sent by the woken-up BMS control unit 105, a relay coil in the wake-up relay 102 is powered on, a normally open contact is closed, the wake-up relay 102 enters a closed state, and a power supply loop of the low voltage battery 101 is turned on. The low-voltage storage battery 101 outputs a high-level control signal to the DC-DC module 103 and the vehicle control unit 104 through the wake-up relay 102, and the DC-DC module 103 and the vehicle control unit 104 are woken up. The BMS control unit 105 may transmit a charging signal to the vehicle controller 104, and the vehicle controller 104 may control the operating state of the DC-DC module 103 after receiving the charging signal. Specifically, the vehicle control unit 104 may send a DC-DC enabling signal to enable the DC-DC module 103 to work and output 12V to supply power to the low-voltage battery 101, and simultaneously supply power to the vehicle low-voltage system, so as to ensure that the low-voltage system works normally in the charging process.
Therefore, the charging control circuit of the embodiment of the invention can enable the low-voltage system of the DC12V of the electric automobile to realize quick charging by using the quick charging piles of the DC12V and the DC24V through the BMS control unit 105 and the wake-up relay 102 which are compatible with the wake-up signals of the DC12V and the DC 24V.
In an embodiment of the present invention, referring to fig. 2 and fig. 3, the charging control circuit 100 may further include a gateway control unit 106, a wake-up signal input terminal g1 of the gateway control unit 106 is connected to a1 terminal of the normally open contact, a wake-up signal output terminal g2 of the gateway control unit 106 is connected to the vehicle controller 104 and the DC-DC module 103, respectively, and the gateway control unit 106 is configured to wake up the vehicle controller 104 and the DC-DC module 103 when the normally open contact is closed and wake up the vehicle controller 104 and the DC-DC module 103 through a network signal.
The gateway control unit 106 may be a gateway controller, and is configured to perform data interaction on the entire vehicle network, and route network data transmitted by each bus in the electric vehicle in different networks.
Specifically, after the BMS control unit 105 controls the wake-up relay 102 to operate and close, the wake-up relay 102 outputs a high level signal to the gateway control unit 106, the gateway control unit 106 is woken up, and the vehicle control unit 104 and the DC-DC module 103 are woken up through a network signal. Of course, the vehicle control unit 104 and the DC-DC module 103 may also be directly woken up by a high level signal output by the wake-up relay 102.
In an embodiment of the present invention, referring to fig. 4, the charging control circuit 100 may further include a T-BOX module 107, where a wake-up signal input terminal f1 of the T-BOX module 107 is connected to a terminal a1 of the normally open contact and a wake-up signal output terminal g2 of the gateway control unit, respectively, and the T-BOX module 107 is configured to be woken up when the normally open contact is closed or woken up by the gateway control unit 106 through a network signal.
The T-BOX module 107 is a pure electric vehicle-mounted terminal monitoring module, and can manage the operation data and position data of the vehicle, and provide functions including real-time monitoring, data playback, track playback, remote fault diagnosis, and the like.
As an example, after being woken up, the T-BOX module 107 may be communicatively connected to a mobile terminal, so as to implement remote control of the electric vehicle, such as remote control of the end of charging.
In one embodiment of the present invention, as shown with reference to fig. 5, the charge control circuit 100 may further include a first fuse 108 and a second fuse 109. The end C1 of the first fuse 108 is connected with the end a2 of the normally open contact, the end C2 of the first fuse 108 is connected with the low-voltage battery 101, the end C3 of the second fuse 109 is connected with the end b2 of the relay coil, and the end C4 of the second fuse 109 is connected with the low-voltage battery 101. In this embodiment, when the short-circuit fault occurs in the charge control circuit 100, the low-voltage battery 101 may be protected from the short-circuit fault by the first fuse 108 and the second fuse 109.
In an embodiment of the present invention, a charging relay is connected to a charging circuit of a power battery of the electric vehicle, and the BMS control unit 105 is specifically configured to send charging information to the vehicle control unit 104 after the vehicle control unit 104 is awakened, so that the vehicle control unit 104 generates a charging control signal according to the charging information; receiving a charging control signal and controlling a charging relay to be closed; and acquiring the state information of the charging relay, and feeding the state information of the charging relay back to the vehicle control unit 104, so that the vehicle control unit 104 controls the DC-DC module 103 to work after determining that the charging circuit is communicated according to the state information of the charging relay.
Wherein the charging relay may include a main positive relay and a main negative relay. The main positive relay is connected between the positive high-voltage output end of the quick-charging pile and the positive pole of the power battery, and the main negative relay is connected between the negative high-voltage output end of the quick-charging pile and the negative pole of the power battery. Of course, the charging relay may also include only the main positive relay.
Specifically, the charging circuit of the power battery of the electric vehicle is further connected with a high-voltage relay, the high-voltage relay can be connected between a main positive relay and a fast-charging pile high-voltage output positive terminal, after the BMS control unit 105 starts working, the high-voltage relay can be controlled to be closed, state information of the high-voltage relay can be acquired, a charging signal and the state information of the high-voltage relay can be sent to the vehicle control unit 104 through the gateway control unit 106, and after the vehicle control unit 104 receives the information, the charging control signal is generated according to the information and sent to the BMS control unit 105. The BMS control unit 105 controls the main positive relay and the main negative relay to be closed according to the charging control signal, and feeds back the state information of the main positive relay and the main negative relay to the vehicle control unit 104. And after the charging circuit is determined to be connected according to the state information, the vehicle control unit 104 sends a DC-DC enabling signal to enable the DC-DC module 103 to work and output 12V to supply power to the low-voltage storage battery 101.
As an example, a pre-charge circuit may also be connected in the charging circuit, the pre-charge circuit being connected in parallel with the main positive relay, the pre-charge circuit including a pre-charge relay. The BMS control unit 105 may control the negative relay and the pre-charge relay to be turned on first according to the charging control signal, and may control the main positive relay to be turned on and the pre-charge relay to be turned off after the pre-charge is completed.
In an embodiment of the present invention, BMS controlling unit 105 is specifically further configured to control the charging relay to turn off when receiving a charging suspension signal or detecting an interruption of a fast charging signal; after the charging relays are all turned off, the wake-up relay 102 is controlled to be turned off, so that the vehicle control unit 104 and the DC-DC module 103 stop working.
Specifically, when the user stops charging by swiping a card, or BMS control unit 105 detects interruption of the quick charge signal, BMS control unit 105 sends a charging stop message. The BMS control unit 105 simultaneously turns off the main positive relay and the high voltage relay, then turns off the main negative relay, and feeds back the relay state to the vehicle control unit 104. After the relay is controlled to be turned off, the wake-up relay 102 is controlled to be turned off. After the wake-up relay 102 is turned off, the DC-DC module 103, the vehicle control unit 104 and the T-BOX107 stop working, enter a sleep state, and the charging is finished.
To enable those skilled in the art to more clearly understand the present application, the present application will be further described with reference to the specific example shown in fig. 6.
Referring to fig. 6, after the quick charging gun is connected to the charging port of the electric vehicle, the quick charging post sends a trigger signal to wake up the BMS control unit 105. After the BMS controlling unit 105 is awakened, the state information of the fast charging pile is verified, and the auxiliary power supply of the fast charging pile, such as 12V or 24V, is judged, and then enters a working state. After the BMS control unit 105 enters the working state, the BMS control unit 105 controls the wake-up relay 102 to work and close, the wake-up relay 102 outputs a high level to wake up the DC-DC module 103, the vehicle control unit 104 and the T-Box module 107, or the wake-up relay 102 outputs a high level to wake up the gateway control unit 106 first, and then the gateway control unit 106 wakes up the DC-DC module 103, the vehicle control unit 104 and the T-Box module 107 in a network wake-up manner.
Further, after the vehicle control unit 104 is awakened, the BMS control unit 105 sends the charging signal and the state information of the high-voltage relay to the vehicle control unit 104, and the vehicle control unit 104 generates the charging control signal and sends the charging control signal to the BMS control unit 105 after receiving the information sent by the BMS control unit 105. The BMS control unit 105 closes the charging relay and feeds back the state information of the charging relay to the vehicle control unit 104. After the charging circuit is determined to be connected according to the state information, the vehicle control unit 104 sends a DC-DC enabling signal to enable the DC-DC module 103 to convert the 24V voltage into 12V voltage to supply power to the low-voltage storage battery 101.
When the user stops charging or the BMS control unit 105 detects interruption of the charging signal, the BMS control unit 105 transmits a charging stop message to prompt the end of charging. Meanwhile, the BMS control unit 105 disconnects the main positive relay and the high-voltage relay, then disconnects the main negative relay, and feeds back the disconnection state information of the relays to the vehicle control unit 104, and then the BMS control unit 105 controls the wake-up relay 102 to be disconnected, so that the DC-DC module 103, the vehicle control unit 104, and the T-BOX107 stop working, enter a sleep state, and the charging is finished.
According to the charging control circuit provided by the embodiment of the invention, the BMS control unit is awakened through the auxiliary power supply provided by the quick charging pile, and the whole vehicle controller and the DC-DC module are awakened through the BMS control unit, so that the whole vehicle controller controls the DC-DC module to output the preset voltage to supply power to the low-voltage storage battery, and therefore, the dangerous problems that the pure electric vehicle DC12V low-voltage system is not matched with the direct-current quick charging pile DC24V, the charging cannot be carried out, and the high-voltage accident can cause danger can be effectively avoided.
Fig. 7 is a flowchart of a charging control method according to an embodiment of the present invention. The charging control method is used for the charging control circuit, and comprises the following steps:
and S101, when the charging connection is established between the quick charging pile and the electric automobile, the BMS control unit is awakened through an auxiliary power supply provided by the quick charging pile.
And S102, the BMS control unit controls the normally open contact to be closed through the relay coil so as to awaken the vehicle control unit and the DC-DC module.
And S103, the BMS control unit controls the DC-DC module to work through the vehicle control unit, so that the DC-DC module outputs preset voltage to supply power to the low-voltage storage battery.
It should be noted that, for the specific implementation of the charging control method in the embodiment of the present invention, reference is made to the specific implementation of the charging control circuit, and details are not described here again.
According to the charging control method provided by the embodiment of the invention, the BMS control unit is awakened through the auxiliary power supply provided by the quick charging pile, and the whole vehicle controller and the DC-DC module are awakened through the BMS control unit, so that the whole vehicle controller controls the DC-DC module to output the preset voltage to supply power to the low-voltage storage battery, and therefore, the dangerous problems that the pure electric vehicle DC12V low-voltage system is not matched with the direct-current quick charging pile DC24V, the charging cannot be carried out, and the high-voltage accident can cause danger can be effectively avoided.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A charge control circuit, wherein the charge control circuit is for an electric vehicle, the charge control circuit comprising:
a low-voltage battery;
the wake-up relay comprises a normally open contact and a relay coil, and one end of the normally open contact and one end of the relay coil are both connected with the low-voltage storage battery;
the wake-up signal input end of the DC-DC module is connected with the other end of the normally open contact, and the output end of the DC-DC module is connected with the low-voltage storage battery;
the wake-up signal input end of the vehicle control unit is connected with the other end of the normally open contact, and the vehicle control unit is also connected with the control end of the DC-DC module;
the BMS control unit is connected with the other end of the relay coil and used for being awakened when receiving a trigger signal sent by a quick charging pile, controlling the normally open contact to be closed through the relay coil so as to awaken the vehicle control unit and the DC-DC module, and controlling the DC-DC module to work through the vehicle control unit so as to enable the DC-DC module to output preset voltage to supply power for the low-voltage storage battery.
2. The charge control circuit of claim 1, further comprising:
and the awakening signal input end of the gateway control unit is connected with the other end of the normally open contact, the awakening signal output end of the gateway control unit is respectively connected with the vehicle control unit and the DC-DC module, and the gateway control unit is used for awakening the vehicle control unit and the DC-DC module when the normally open contact is closed and awakening the vehicle control unit and the DC-DC module through network signals.
3. The charge control circuit of claim 2, further comprising:
and the awakening signal input end of the T-BOX module is respectively connected with the other end of the normally open contact and the awakening signal output end of the gateway control unit, and the T-BOX module is used for being awakened when the normally open contact is closed or being awakened by the gateway control unit through a network signal.
4. The charge control circuit of claim 1, further comprising:
a first fuse connected between the low-voltage battery and the normally open contact;
a second fuse connected between the low-voltage battery and the relay coil.
5. The charging control circuit according to claim 1, wherein a charging relay is connected to the charging circuit of the power battery of the electric vehicle, and the BMS control unit is specifically configured to:
after the vehicle control unit is awakened, sending charging information to the vehicle control unit so that the vehicle control unit generates a charging control signal according to the charging information;
receiving the charging control signal and controlling the charging relay to be closed;
and acquiring the state information of the charging relay, and feeding back the state information of the charging relay to the vehicle control unit, so that the vehicle control unit controls the DC-DC module to work after determining that a charging loop is communicated according to the state information of the charging relay.
6. The charging control circuit according to claim 5, wherein a high-voltage relay is further connected to the charging circuit of the power battery of the electric vehicle, and the BMS control unit is further configured to:
after the vehicle control unit is awakened, the high-voltage relay is controlled to be closed, state information of the high-voltage relay is acquired, and the state information of the high-voltage relay is sent to the vehicle control unit, so that the vehicle control unit generates the charging control signal according to the charging information after the high-voltage relay is closed.
7. The charge control circuit of claim 5, wherein the BMS control unit is further configured to:
when a charging suspension signal is received or interruption of a quick charging signal is detected, controlling the charging relay to be switched off;
and after the charging relays are all switched off, the awakening relay is controlled to be switched off so as to stop the work of the vehicle control unit and the DC-DC module.
8. The charge control circuit of claim 1, wherein the trigger signal comprises an auxiliary power voltage provided by the fast charge stake, wherein the auxiliary power voltage is a dc12V voltage or a dc24V voltage.
9. The charge control circuit of claim 1, wherein the predetermined voltage is a dc12V voltage.
10. A charging control method for a charging control circuit according to any one of claims 1 to 9, the control method comprising the steps of:
when charging connection is established between the quick charging pile and the electric automobile, the BMS control unit is awakened through an auxiliary power supply provided by the quick charging pile;
the BMS control unit controls the normally open contact to be closed through the relay coil so as to wake up the vehicle control unit and the DC-DC module;
the BMS control unit controls the DC-DC module to work through the vehicle control unit, so that the DC-DC module outputs preset voltage to supply power to the low-voltage storage battery.
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| CN202011138768.7A CN112277727A (en) | 2020-10-22 | 2020-10-22 | Charging control circuit and charging control method |
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