KR101738043B1 - electrical vehicle charging system and method - Google Patents

Abstract

The present invention relates to an electric vehicle charging system and method, and more particularly, to an electric vehicle charging system which eliminates a screen in a conventional slow charger and shows a state of charge by a smart phone, And more particularly, to an electric vehicle charging system and method capable of knowing a state of charge of a vehicle through a smart phone without regard to the state of the vehicle. According to the present invention, it is possible to provide the consumers with a lower cost when purchasing the charger by removing the screen from the conventional slow charger and showing the charging state with the smart phone, and it is possible to provide the charging state It is advantageous to provide convenience.

Description

Technical Field [0001] The present invention relates to an electric vehicle charging system and method,

The present invention relates to an electric vehicle charging system and method, and more particularly, to an electric vehicle charging system which eliminates a screen in a conventional slow charger and shows a state of charge by a smart phone, And more particularly, to an electric vehicle charging system and method capable of knowing a state of charge of a vehicle through a smart phone without regard to the state of the vehicle.

The automobile is an invention that made a great contribution to human civilization. However, to use a car, you have to use a limited amount of oil. In addition, environmental pollution problems arise in the process of consuming petroleum to use automobiles. The depletion of petroleum resources buried on the earth and the reinforcement of environmentally friendly regulations have led to the development of electric vehicles that can go to electricity.

Hybrid Electric Vehicle and Fuel Cell Electric Vehicle, which use a Batttery Powered Electric Vehicle, an electric motor and an engine together, are examples of developed electric vehicles. In particular, a plug-in hybrid electric vehicle and a pure electric vehicle are electric vehicles supplied with power required for driving from a high-voltage battery provided inside the vehicle.

FIG. 1 is a diagram showing a general control pilot (PILOT) equivalent circuit. In the past, when the electric vehicle (EV) 20 is charged, the charging sequence is such that the charger 10 is in a standby state until the electric vehicle 20 is connected When the inlet of the electric vehicle 20 and the connector of the charger 10 are connected to each other, an AC voltage is applied to the on-board charger in the charger 10 and the voltage stored in the on- Is supplied to the battery of the electric vehicle 20 and charged. That is, conventionally, when the electric vehicle is charged, the charger merely supplies AC power to the electric vehicle.

Fig. 2 is a diagram showing a typical charging cycle of the charger in a normal operating state, and the connection sequence for this is shown in Table 1 below.

condition Condition One A No cars connected - The total generator voltage is measured from Va to the power supply. The generator signal Vg is a + 12V dc voltage. 2 B Connect the cable assembly to the vehicle and the power supply. This condition is detected with a 9V signal measured at Va. The low voltage (Vg) from the signal generator can be a ± 12V, 1kHz signal if a steady state + 12V DC or power supply is immediately available for energy supply. 3 B The power supply is now able to supply energy and represents the current available in the car. The presence of diode D is detected at -12V and the 9V signal ensures that the connected car is reliable. 4 B →
C, D S2 is closed by the car as a function of the requirement and indicates that the car is able to receive energy. There is no timing requirement for On Closure. 5 C, D The power supply closes the circuit. The switch closing timing may vary depending on other requirements (payment, data exchange). If state D is detected, the switch will only be closed if ventilation requirements are met. 6 C, D The current, timing and current distribution drawn from the vehicle are determined by the vehicle. The current can not exceed that shown in the duty cycle. 7 C, D External demand for power reduction. This demand may arise from the grid or by manual configuration of the power supply. The car adjusts the current demand as it appears in the duty cycle. 8 C, D Charge termination, determined by car 9 C, D
→ B The car requires a disconnect. This can be the result of an open proximity contact. 10 B The power supply detects state B (opening S2 in the car) and opens the contactor. 11 A Whether the cable assembly is completely removed from the vehicle or the power supply is detected with a 12V signal. NOTE When the charging period is over, the power supply that is allowed to remove the plug is terminated by entering State A.

Figure 2 shows a typical charge cycle of an existing charger, and Table 1 shows the sequence of operations for a charge cycle. FIG. 3 is a view showing a control flow of the charger control unit. Referring to FIG. 2 and Table 1, when the charger maintains 12V, when the charger connector is connected to the inlet of the electric vehicle, the voltage drops to 9V. At this time, the S2 switch of the pilot circuit (PILOT Circuit) is closed and the voltage drops to 6V. When electric current is drawn from the electric vehicle to check the state of charge of the vehicle and the charge completion command is transmitted from the electric vehicle, disconnect the charger connector from the vehicle inlet. At this time, the S2 switch in the pilot circuit (PILOT Circuit) is turned off and the connection is completely disassembled. And the charger maintains 12V again.

4 is a diagram showing a signal flow from a conventional charger to a user interface (UI), in which a control unit 11 inside a charger 10 is attached to the inside of a charger 10 through an RS232 communication unit 12 A signal is transmitted to the display user interface (UI)

As described above, conventionally, there is a disadvantage that a slow charging device for charging an electric vehicle is equipped with a screen for showing the charged state, which increases the price of the charging device, and it is difficult to control the control device of the charging device.

Also, the conventional charger is not equipped with a system that can charge the electric vehicle by using the nighttime power, which is relatively inexpensive to use the electric power, so that the charging cost of the electric vehicle can not be reduced.

KR 10-0949260 B1

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a charger that eliminates a screen in a conventional slow charger and displays a charged state with a smart phone, The present invention also provides an electric vehicle charging system and method that can provide convenience even when a vehicle is charged through a smart phone.

In addition, a charging reservation function program that can charge an electric vehicle using a night-time electric power to a smart phone as a user interface device is charged, thereby charging the electric vehicle in a predetermined midnight time, thereby reducing electric vehicle charging cost and contributing to load leveling. And to provide a charging system and method for an electric vehicle.

According to an aspect of the present invention, there is provided a charging system for an electric vehicle, comprising: a charging device for charging an electric vehicle; A user interface device for recognizing and monitoring the state of the charger in real time; And
A function of checking the state of the charger according to the control of the user interface device and selecting and transmitting data to the user interface device and charging the electric vehicle using the midnight power at a reserved time, And a charger having a function of performing charging in a predetermined time.

According to another aspect of the present invention, there is provided an electric vehicle charging method comprising the steps of: (a) transmitting a steady state message from a connector of a charger to a microcontroller; (b) selecting data to be transmitted from the microcontroller and transmitting the selected data to the Bluetooth module; (c) transmitting data received from the Bluetooth module to a user interface device; (d) receiving a steady state message from the user interface device in the Bluetooth module and transmitting data to the microcontroller; (e) transmitting an announcement signal from the connector to the microcontroller by the electric vehicle; (f) instructing the microcontroller to turn on charge control ON with the connector according to a charging request from the user interface device; And (g) powering the electric vehicle from the connector at the command of the microcontroller, wherein after step (g): (h) Commanding a reservation for a late night time charge; (i) commanding output control off (OFF) from the microcontroller to the connector; (j) informing the microcontroller at the connector that it is a reserved time for charging the electric vehicle at night time; (k) instructing the microcontroller to turn on charge control ON with the connector; And (l) powering the electric vehicle according to an instruction from the microcontroller in the connector; (m) transmitting a battery charge state from the electric vehicle to the microcontroller; (n) instructing, from the microcontroller to the connector, a charge time determined based on the received battery charge amount status; (o) supplying electric power to the electric vehicle when charging time is reached from the microcontroller in the connector; (p) instructing the microcontroller to charge the battery and to release the connector in the electric vehicle; And (q) releasing the connector from the electric vehicle under the control of the microcontroller.

According to the present invention, it is possible to provide the consumers with a lower cost when purchasing the charger by removing the screen from the conventional slow charger and showing the charging state with the smart phone, and it is possible to provide the charging state It is advantageous to provide convenience.

In addition, a charging reservation function program that can charge an electric vehicle using a night-time electric power to a smart phone as a user interface device is charged, thereby charging the electric vehicle in a predetermined midnight time, thereby reducing electric vehicle charging cost and contributing to load leveling. There is an effect that can be.

1 shows a general control pilot (PILOT) equivalent circuit;
2 shows a typical charging cycle of a charger in a normal operating state;
3 is a view showing a control flow of the charger control section;
4 shows a signal flow from a conventional charger to a user interface (UI);
5 illustrates signal flow from a charger to a user interface device in accordance with one embodiment of the present invention.
6 is a diagram showing the actual hardware configuration of Fig. 5; Fig.
FIG. 7 is a diagram illustrating a signal flow from a charger control unit with a built-in microcontroller to a user interface device in FIG. 5;
8 is a diagram showing the actual hardware configuration of Fig. 7; Fig.
9 is a view showing an EV Charger block diagram of an electric vehicle charger of the present invention.
10 is a diagram illustrating a process in which a signal is transmitted from a microcontroller of a charger to a user interface device through a Bluetooth module in FIG.
11 is a diagram showing a reservation method for charging using night-time power of the present invention.
12 is a view showing a control method for electric vehicle charging according to the present invention.
13 is a diagram showing a reservation method for charging using the nighttime power of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

FIG. 5 is a diagram showing a signal flow from a charger to a user interface device according to an embodiment of the present invention, and FIG. 6 is a diagram showing the actual hardware configuration of FIG.

The charger 30 according to the present invention receives signals from the controller 31 through the RS232 communication unit 32 directly to the user interface device 40 and receives all the signals from the microcontroller 33 It not only sends the required signal to the Bluetooth module 34 but also performs the reservation function. In particular, the user interface device 40 includes a user interface (UI) using a smart phone capable of communicating via the Bluetooth module 34, rather than a display user interface (UI) existing inside the charger.

FIG. 7 is a diagram illustrating a signal flow from a charger control unit with a built-in microcontroller to a user interface unit in FIG. 5, and FIG. 8 is a diagram showing the actual hardware configuration of FIG.

The charger 30 includes a control unit 35, a communication unit 32 and a Bluetooth module 34. The charger 30 having such a configuration includes a user interface device 40, Communication.

The controller 35 incorporates the microcontroller shown in FIG. 5 and sends necessary signals to the Bluetooth module 34 as well as a reservation function. The reservation function will be described in detail below. The control unit 35 transmits and receives the RS232 signal by communication with the user interface device 40 and is controlled by the user interface device 40. [

The communication unit 32 transmits a signal from the control unit 35 to the Bluetooth module 34 in the RS232 communication mode.

The Bluetooth module 34 receives the signal transmitted from the control unit 35 through the communication unit 32 and transmits the received signal to the user interface unit 40.

The user interface device 40 is a user interface device capable of communicating via the Bluetooth module 34 as described above, and can be used as a user interface device. In addition, a smart device or the like capable of communicating with the Bluetooth module 34 Can be used. The user interface device 40 is installed in an existing charger so that an app capable of controlling the control unit 35 of the charger 30 is mounted instead of displaying only the signal value through an existing app.

9 is a diagram showing an EV Charger block diagram of an electric vehicle charger according to the present invention.

As shown, the charger 30 of the present invention includes a communication unit 32, a user interface device 40, a control unit 35, and a connector 36, and the electric vehicle (EV) An inlet 51, an on-board charger 52, and a battery 53. The on-

The communication unit 32 communicates with a user interface device 40 such as a smart device including a smart phone and exchanges signals with an electric vehicle (EV) 50. When the connector 36 of the charger 30 is connected to the inlet 51 of the electric vehicle EV 50 for charging the battery 53 of the electric vehicle EV 50, (EV) 50 to the user interface device 40, and transmits a control signal, which is transmitted from the user interface device 40, to the electric vehicle (EV) 50, Lt; / RTI >

The user interface device 40 is a user interface device capable of communicating through a Bluetooth module as described above, and can use a smart phone as a user interface device, and a smart device capable of communicating with a Bluetooth module. The user interface device 40 is equipped with an app which can control the control unit 35 of the charger 30.

The control unit 35 receives a signal related to the charged state of the battery transmitted from the electric vehicle EV 50 and transmits the signal to the user interface device 40 through the communication unit 32, And transmits a control signal from the user interface device 40 to the electric vehicle (EV) 50 connected by the connector 36. [ It also performs a reservation function for charging the nighttime power. The reservation function will be described in detail below.

The connector 36 is connected to the inlet 51 of the electric vehicle (EV) 50 for charging the electric vehicle (EV)

The on-board charger 52 of the electric vehicle (EV) 50 measures the state of charge of the battery 53 and transmits it to the charger 30, The charger 30 receives and stores power for charging.

The charging sequence of the electric car charger having such a configuration is such that the charger 30 is in the standby state until the electric car 50 (EV) is connected, and the connector 36 of the charger 30 is in the standby state, The AC voltage is applied to the on-board charger 52 and the voltage stored in the on-board charger 52 is supplied to the battery 53 To be charged.

As described above, the communication between the existing charger and the electric vehicle (EV) is one-way communication in which the electric car transmits a signal to the charger, but the communication between the charger and the electric vehicle (EV) The on-board charger measures the state of the battery and sends it to the charger. In this case, the charger can determine the charging time or the charging amount according to the state of the battery and charge the battery.

The above-described charger of the present invention can be manufactured in a low price and can be provided to consumers by eliminating the screen from the conventional slow charger and showing the charging state with the smart phone, and can know the charging state of the vehicle through the smart phone regardless of the place It is convenient because it is there. In addition, the nighttime power charging (reservation function) algorithm described below can be installed to reduce the charging cost of the electric vehicle and contribute to the load leveling.

FIG. 10 is a diagram illustrating a process of transmitting a signal from a microcontroller of a charger to a user interface device through a Bluetooth module in FIG.

As shown in the figure, when the status of the charger is inquired (S10) and the inquired signal is outputted, the microcontroller of the charger receives and confirms the signal outputted from the RS232 communication unit (S20). At this time, the microcontroller confirms whether the signals output from the RS232 communication unit are transmitted with the same signals as the protocol signals shown in Table 2 below, which indicate the protocol format.

Subsequently, the microcontroller checks whether the charger is in a normal state (S30). At this time, the method of checking the state of the charger is determined as the normal state of the charger when the CMD value, which is a command for inquiring the state of the charger among the items of Table 3 below, is in lower case 's'.

Subsequently, the microcontroller selects a signal to be transmitted to the user interface device through the Bluetooth module (S40). The signal selected by the microcontroller is transmitted to the Bluetooth module (S50), and transmitted from the Bluetooth module to the user interface device such as a smart phone (S60). At this time, signals transmitted are signals as shown in Table 4 below, which indicates the charger user interface protocol. 6. Emergency stop state, 11. Pilot state, 16. Switch state, 24. Charge amount, 33. Cumulative power amount, do.

In the charger protocol of the present invention, a conventional charger real-time monitors user recognition and charger status through a user interface (UI). However, the charger of the present invention does not use a user interface (UI) used in a conventional charger but uses a smart phone, which is a user interface device equipped with an app capable of controlling a control unit of Bluetooth and a charger, And real time monitoring of the charger status. Accordingly, in the present invention, the existing protocol for the charger is analyzed to check the communication message interlocked with the user interface device connected to the charger, and the important message among the analyzed protocols can be monitored in real time through the smart phone as the user interface device . Table 4 below shows the user interface (UI) protocol of the charger of the present invention.

Byte Bit Item Value Remarks 6 Emergency stop status Off: 0 × 00, Operation: 0 × 01 11 Pilot (PILOT) status 12V: 0 占 01, 9V: 0 占 02, 6V: 0 占 03,
3V: 0 × 04, 0V: 0 × 05 16 Switch status OFF: 0 x 00, ON: 0 x 01 24 Charge amount Hex, 1/1000 unit kWh 25 Ex) 100 (0 x 64)? [24] 0 x 64 [25] 0 x 00 26 [26] 0 占 00 [27] 0 占 00 27 30 Charge shutdown detailed state 1: CP, 2: Emergency stop 3: UI card 4: Switch 5: Keypad 6: Cable harness 7: Low current 8:
9: Rising (low current), 10: PWM -12V Fail,
11: MC fusion, 12: Overvoltage 33 Cumulative amount Unit: kWh, BCD 34 Ex) 12345.6 kWh → 0 × 00 0 × 12 0 × 34 0 × 56 35 36

11 is a diagram showing a reservation method for charging using night-time power of the present invention.

As shown in the figure, a process for charging an electric vehicle using night-time electric power will be described. First, the connector of the charger is connected to the electric vehicle (S10).

The charger turns off the output control for charging the electric vehicle in a state where the connector is connected to the electric vehicle, and maintains the charging standby state (S20).

Subsequently, the charger determines whether the current time is the night time (S30). Here, the night time is predefined so that it is possible to determine whether the current time is the night time based on the predetermined night time in the charger.

If the current time is not the predetermined midnight time in step S30, the charger continuously turns off the output control for charging the electric vehicle to maintain the charging standby state. If the current time is the predetermined midnight If it is determined that the electric vehicle is in operation, an output control for charging the electric vehicle is turned on (S40).

However, when an error is detected (S50) when the output control for charging the electric vehicle is controlled to the ON state, the output control is turned off to maintain the charging standby state.

When the output control for charging the electric vehicle is normally controlled to be ON, the charger starts charging the battery of the electric vehicle (S60). When the battery of the electric vehicle is charged, the charging is completed (S70) do.

As described above, the charger of the present invention determines whether or not it is the midnight time without directly starting charging by turning on the output control for charging the electric vehicle even if the connector is connected to the electric vehicle. And the charging is started by turning ON the output control only in the case of the midnight time. That is, in the present invention, it is determined whether the charger is connected to the electric vehicle and whether it is the night time, and the charger is connected to the electric vehicle.

12 is a diagram showing a control method for charging an electric vehicle according to the present invention.

As shown, a 12V signal is transmitted from the connector 36 of the charger to the microcontroller 33 (S10).

The microcontroller 33 of the charger transmits a steady state request message to the connector 36 in step S20 and the connector 36 transmits a steady state OK message to the microcontroller 33 in step S30, do.

Then, the microcontroller 33 of the charger selects data to be transmitted and transmits the data to the Bluetooth module 34 (S40). The Bluetooth module 34 transmits the data transmitted from the microcontroller 33 to the smartphone 40 (S50).

The smartphone 40 transmits a normal state OK message to the Bluetooth module 34 in step S60 when the data is transmitted from the Bluetooth module 34. The Bluetooth module 34 transmits data to the microcontroller 33 in step S70 )do.

Then, the connector 36 of the charger sends a 9V electric car connection status signal to the microcontroller 33 (S80). The microcontroller 33 recognizes that the electric vehicle (EV) 50 is connected to the charger when a 9V electric car connection status signal is transmitted from the connector 36. [

Then, the smartphone 40 requests charging of the microcontroller 33 of the charger (S90). The microcontroller 33 of the charger instructs the output control ON for charging the electric vehicle 50 with the connector 36 so that the connector 36 is connected to the AC electric power source 50 (6V) is supplied (S110).

13 is a diagram showing a reservation method for charging using the night-time power of the present invention.

As shown in the figure, the smartphone 40, which is a user interface device, instructs the microcontroller 33 of the charger to execute a reservation function (S10). Accordingly, the microcontroller 33 sets the time for charging the electric vehicle by using the night-time electric power, and starts charging at a set time.

The connector 36 of the charger instructs the microcontroller 33 to turn off the output control (OFF) (S20).

Subsequently, the connector 36 of the charger notifies the microcontroller 33 that the present time is the predetermined midnight time (S30).

The microcontroller 33 instructs the connector 36 to turn on the output control ON for charging the electric vehicle 50 and the connector 36 instructs the microcontroller 33 The AC power supply 6V for charging the battery of the electric vehicle 50 is supplied (S50).

Then, the electric vehicle 50 transmits information on the charged state of the battery to the microcontroller 33 of the charger (S60).

The microcontroller 33 of the charger commands the charging time for charging the battery of the electric vehicle 50 by the connector 36 (S70).

Accordingly, the connector 36 supplies the AC power source 6V for charging the battery of the electric vehicle 50 (S80) when the charging time is received from the microcontroller 33.

Subsequently, the electric vehicle 50 instructs the microcontroller 33 of the charger to complete the battery charging and release the connector (S90), and controls the connector 36 connected to the electric vehicle 50 under the control of the microcontroller 33 Is released (S100).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

30: Charger
31:
32: RS232 communication section
33: Microcontroller
34: Bluetooth module
40: User interface device
50: Electric vehicles

Claims (6)

An electric vehicle charging system,
A user interface device for recognizing a user and monitoring the state of the charger in real time by controlling a charger by checking a state of charge of the electric vehicle and a program capable of charging the electric vehicle using nighttime power; And
A function of checking the state of the charger according to the control of the user interface device and selecting and transmitting data to the user interface device and charging the electric vehicle using the midnight power at a reserved time, A charger having a function of charging in time;
And an electric vehicle.
The method according to claim 1,
The charger includes:
A controller for checking the state of the charger according to the control of the user interface device, selecting data to be transmitted to the user interface device, and performing a reservation function for charging the electric vehicle using nighttime power;
A communication unit for communicating with the user interface device by a serial communication method;
A Bluetooth module that receives the data selected by the controller through the communication unit and transmits the control signal to the user interface device and transmits the control signal transmitted from the user interface device to the control unit through the communication unit; And
A connector connected to the electric vehicle under the control of the control unit to supply power to the electric vehicle or disconnect the electric power to cut off the power supply;
Wherein the electric vehicle charging system comprises:
As an electric vehicle charging method,
(a) transmitting a steady state message from the connector of the charger to the microcontroller;
(b) selecting data to be transmitted from the microcontroller and transmitting the selected data to the Bluetooth module;
(c) transmitting data received from the Bluetooth module to a user interface device;
(d) receiving a steady state message from the user interface device in the Bluetooth module and transmitting data to the microcontroller;
(e) transmitting an announcement signal from the connector to the microcontroller by the electric vehicle;
(f) instructing the microcontroller to turn on charge control ON with the connector in response to a charging request from the user interface device; And
(g) powering the electric vehicle according to an instruction from the microcontroller in the connector;
Lt; / RTI >
After step (g)
(h) instructing the microcontroller in the user interface device to make a reservation for charging the electric vehicle at night time;
(i) commanding output control off (OFF) from the microcontroller to the connector;
(j) informing the microcontroller at the connector that it is a reserved time for charging the electric vehicle at night time;
(k) instructing the microcontroller to turn on charge control ON with the connector; And
(1) supplying electric power to the electric vehicle according to a command from the microcontroller in the connector;
(m) transmitting a battery charge state from the electric vehicle to the microcontroller;
(n) instructing, from the microcontroller to the connector, a charge time determined based on the received battery charge amount status;
(o) supplying electric power to the electric vehicle when charging time is reached from the microcontroller in the connector;
(p) instructing the microcontroller to charge the battery and to release the connector in the electric vehicle; And
(q) the connector is released from the electric vehicle under the control of the microcontroller
Further comprising the steps of:
The method of claim 3,
The step (a)
(a1) transmitting a signal from the connector to the microcontroller;
(a2) transmitting a steady state request message from the microcontroller to the connector; And
(a3) transmitting a steady state message from the connector to the microcontroller;
Wherein the electric motor is electrically connected to the electric motor.


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