Method for controlling charging or discharging of charging system of electric vehicle charging station
Technical Field
The invention relates to an electric automobile, charging equipment of a charging station and a charging method thereof, in particular to a charging mechanism for providing a safe charging environment for the charging or discharging process of the electric automobile needing to be charged and a charging method thereof.
Background
Electric vehicles are the most reliable solution to the energy problem, and research on electric vehicles is rapidly progressing in recent years. Electric vehicles are powered by driving an AC (alternating current) or DC (direct current) motor mainly using a power source of a battery, and are roughly classified into battery-dedicated electric vehicles that drive a motor using a power source of a battery and are recharged after the power source is consumed and hybrid electric vehicles; a hybrid electric vehicle runs a vehicle by running an engine to generate electricity to charge a battery and driving an electric motor with the electricity. Hybrid electric vehicles are classified into a series system in which mechanical energy output from an engine is converted into electrical energy by a generator, and the electrical energy is supplied to a battery or a motor, so that the vehicle is always driven by the motor, and a parallel system in which the engine and the generator are additionally provided to a conventional electric vehicle in order to increase the range of the vehicle; the parallel system can run the vehicle using a battery power supply and can drive the vehicle using only an engine (gasoline or diesel), and the parallel system can drive the vehicle using both power sources and can drive the engine and the motor at the same time according to the running conditions.
With the increasing development of motor control technology, a system having high output, small size, and high efficiency has been developed. With the conversion of a DC motor into an AC motor, the output and the power performance (acceleration performance, maximum speed) of the electric vehicle are greatly improved, reaching a level comparable to that of a gasoline vehicle. As the high output is promoted and the high rotation is realized, the weight and size of the motor are reduced and the weight and volume of the motor are also greatly reduced. Since an electric vehicle charges a battery pack mounted thereon and starts the vehicle using a charged power source, it is necessary to stably supply a current accumulated in the battery pack to the vehicle at the time of starting. In charging for charging an electric vehicle, a charging cable mounted on the vehicle is connected between the vehicle and a vertical charger to perform charging. Or a system for charging by radio frequency card (RF) authentication is provided, and charging is started after the radio frequency card authentication is normally finished. However, in the conventional charging system for the electric vehicle, the user has to carry the charging cable, and the cable frame may be stolen. Further, the electric vehicle needs to be charged for a long time, and the following problems may occur: if the cable is disconnected to another car during its charging, the other car is charged and its cost is still borne by the user. In such an electric vehicle, when a cable or a connector is connected for charging at a charging station or the like, a line for detecting whether the cable or the connector is normally connected to each other is required in addition to data or a line through which a charging current flows in order to confirm whether the cable or the connector is normally connected. In particular, two lines are required for detecting whether the electric vehicle and the charging station are connected or not. However, generally, both lines used for identifying the mutual connection perform the function of identifying the connection, i.e., both lines perform the same function, and thus need to be repeatedly set.
Conventionally, in order to resolve such a situation, the mutual connection is recognized by using one line, and there is a case where one side recognizes the connection and the other side cannot recognize the connection, that is, the mutual recognition cannot be performed at the same time. When a line is used and both sides are connected by identification, a communication integrated circuit is used, and thus, there is a problem that unnecessary expensive components are used for easily identifying the circuits connected to each other.
Therefore, it is necessary to find a scheme that can safely connect using one line and simply constitute a circuit.
Disclosure of Invention
The technical scheme of the invention aims to provide a charging system of an electric vehicle charging station and a charging control method thereof, which can prevent illegal access through user authentication and vehicle authentication when charging an electric vehicle, thereby conveniently charging the electric vehicle in a safer environment.
The invention discloses a method for controlling charging or discharging of a charging system of an electric vehicle charging station, which is characterized in that the charging system of the charging station comprises the following steps:
the power supply system comprises a plurality of power supply grids, a plurality of control circuits and a plurality of control circuits, wherein the power supply grids are used for acquiring AC alternating current from power supply grid power lines and converting the AC alternating current into DC direct current for storage;
the electric automobile is directly charged by connecting at least one power supply of the power grid and comprises an energy storage device and a charging connector connected with the energy storage device, wherein
The energy storage device includes:
an energy harvesting circuit for selectively taking electricity from a power grid power line when electrically connected with a charging socket;
the motor is electrically coupled with the energy acquisition circuit and is used for driving the electric automobile to move;
the single chip microcomputer is connected between the energy acquisition circuit and the motor, is configured to acquire electric energy from a power line of a power grid, and records an identifier of the energy storage device; the energy acquisition circuit comprises a series storage battery pack for circularly storing electric energy and a controller electrically coupled with the storage battery pack, wherein the controller is used for controlling the storage battery pack to take power from a power line of a power grid or discharge to the power line of the power grid and controlling the current intensity of the power taking or discharging action when the energy storage device is connected to a charging socket;
the charging connector includes:
an interface configured as a plurality of passive components corresponding to the grid power signal;
an adsorption device configured to automatically attach to the grid power supply and detect whether to attach to the grid power supply;
the passive signal transmitting device is used for transmitting charging or discharging request information to a power end of the power grid or changing the charging or discharging current intensity after the bonding operation is determined; and
a sensor configured to detect whether the interface is in a stable state by detecting a change in position of the interface;
the charging system of the charging station determines that the interface is completely attached to the power supply end of the power grid through the adsorption device; sending charging or discharging request information to a power end of a power grid after the bonding operation is determined through a passive signal sending device; and detecting a change in position of the interface by a sensor to determine that the interface is in a stable state; and sensing the attaching state through a sensor, and controlling the current intensity of the electricity taking or discharging action of the energy storage device according to the attaching state.
The invention has obvious technical advantages, the electric vehicle side and the charging station power supply side are respectively connected in an identification way, so that the circuit for identifying the connection state between the two sides can be simplified, the complexity of the circuit is reduced, the risk caused by the circuit is reduced, and the connection can be easily identified on the two sides, and other procedures for confirming the connection are not needed, so that the electric vehicle can be conveniently charged. The charging system is able to identify the closest and valid charging terminal and control the input or output power level of the energy storage device during charging to save possible charging time while ensuring safe charging.
Drawings
Fig. 1 is a schematic connection diagram of a charging system of a charging station;
fig. 2 schematically illustrates a schematic block diagram of a charging system of a charging station.
Detailed Description
Referring to fig. 1, in a power network consisting of an electric vehicle 1 and its accessories, the vehicle 1 is connected to a CAN bus communication network 2 through an in-vehicle mobile device 10 to remotely connect to an in-vehicle server terminal 3. On the other hand, the electric vehicle has a charging terminal 13 (e.g., a plug assembly) capable of connecting to a charging socket 41 of the charging facility 4, and a metering device 11 and an energy storage device 12 connected thereto are attached to the plug 13, the energy storage device 12 is connectable to the wireless charging facility 5 on the ground in a Radio Frequency (RFID) manner, and the charging facility 5 is connected to the on-board server terminal 3 via a data transmission line 6 to transmit charging information.
As shown in fig. 2, the charging device for the electric vehicle includes an energy storage device 12 mounted on the electric vehicle and a charging socket 41 matched with the energy storage device, the energy storage device 12 is configured to store electric energy when being connected to the charging socket 41, the energy storage device 12 includes an energy obtaining circuit 121 configured to selectively take electricity from a power line of a power grid when being electrically connected to the charging socket 41; a motor 122 electrically coupled to the energy harvesting circuit 121 and configured to drive the electric vehicle 1 to move or run; the single chip microcomputer 123 is connected between the energy acquisition circuit 121 and the motor 122, and is configured to calculate electric energy obtained from a power line of a power grid and record an identifier of the energy storage device 12; wherein the energy harvesting circuit 121 includes a series battery 1211 for cyclically storing electrical energy; a controller 1212 electrically coupled to the battery pack and configured to control the battery pack to draw power from or discharge power to a grid power line when the energy storage device 12 is plugged into a charging outlet; and controlling the current intensity of the electricity taking or discharging action.
In one embodiment, the connection between the charging socket 41 and the energy storage device 12 is by cable or wireless electromagnetic (e.g., magnetic induction).
Referring to fig. 2, in one embodiment, the energy storage device 12, in particular the energy harvesting circuit 121, is further provided with a Radio Frequency (RFID) circuit 124 for identifying and connecting the corresponding identifiers of the charging sockets within the readable range of the electric vehicle when the electric vehicle is moving or stopping. In another example, the energy harvesting circuit includes a charging connector 13, through which the charging receptacle is connected by a cable via the charging connector 13.
In one embodiment, the RFID circuit 124 includes: a transmitting circuit 1241 configured to measure the intensity of the identifier signal from the charging socket within its readable range and connected to the single-chip microcomputer to determine the nearest charging socket in distance based on the intensity of the identifier signal; and a geographic location information (GIS) circuit 1242 connected to the single chip for identifying the geographic location of the nearest charging socket 41.
In another embodiment, the charging station charging system includes a plurality of grid power sources, such as the wireless charging facility 5 and the charging station 41 or 41' of fig. 1, for taking AC power from the grid power line and converting it to DC power for storage; a directly rechargeable electric vehicle 1 connected to at least one of the grid power sources, wherein the electric vehicle 1 includes the energy storage device 12, and a charging connector 13 connected to the energy storage device, wherein the charging connector 13 includes: an interface 131 configured as a plurality of passive components corresponding to the grid power signal; a suction device 132 configured to automatically attach to the grid power supply and detect whether to attach to the grid power supply 41; a passive signal transmitting device 133 for transmitting a charging or discharging request message to the power source terminal of the power grid or changing the intensity of the charging or discharging current after the bonding operation is determined; and a sensor 134 configured to detect whether the interface is in a stable state by detecting a change in position of the interface.
In one embodiment, the passive component is an inductor or a capacitor, and in a preferred example, the passive component can be electromagnetically attracted by an inductor. In another preferred example, the passive component is attached to the charging socket 41 in a capacitive manner so as to trigger the capacitive element therein to generate an attractive electric charge or to cause the capacitive element in the socket to apply an electric signal to, for example, a charging post for indicating connection.
In one embodiment, the passive components are geometric arrays of metal (e.g., circular or parallel lines) for integral attachment to the magnetic elements of a power grid outlet while having conductive current signals in the geometric arrays of metal. Further, the passive component is a magnetic metal geometric array.
In one embodiment, the sensor 134 includes a first sensor for transmitting a first engagement signal to the grid power source via the passive signaling device 133 when the interface is in a first contact position (e.g., partially engaged) with the grid power source; and a second sensor for sending a second fit signal to the grid power supply via the passive signal sending device 133 when the interface is in a second contact position with the grid power supply (e.g., the charging plug is partially absorbed in a cross section of the interface).
In one embodiment, the controller controls the current intensity of the energy storage device for taking or discharging according to the first or second fitting signal.
In another embodiment, charging or discharging is controlled according to the charging station charging system, and the interface is determined to be completely attached to the power supply end of the power grid through the adsorption device; sending charging or discharging request information to a power end of a power grid after the bonding operation is determined through a passive signal sending device; and detecting a change in position of the interface by a sensor to determine that the interface is in a stable state; and sensing the attaching state through a sensor, and controlling the current intensity of the electricity taking or discharging action of the energy storage device according to the attaching state.
In the embodiment of the invention, the electric vehicle side and the charging station power supply side respectively identify the mutual connection, thereby simplifying the circuit for enabling the two sides to identify the connection state mutually, reducing the complexity of the circuit and reducing the risks caused by the circuit, and because the connection can be easily identified on the two sides respectively, other confirmation procedures for confirming the connection are not needed, the electric vehicle is conveniently charged.