Method and recharging system for automatically selecting recharging mode

1. A method for automatically selecting a recharging mode of an electric vehicle, the method comprising:

identifying a first recharging mode by an onboard charger corresponding to a duty cycle of a pulse width modulation signal received from a control pilot port of an external charger;

activating, by the onboard charger, a power line communication controller of a vehicle to perform power line communication with the external charger;

performing, by the onboard charger, a first recharge process corresponding to the identified first recharging mode;

identifying, by the onboard charger, a second recharging mode according to the duty cycle of the pulse width modulation signal received from the external charger when the first recharge process fails; and

automatically selecting, by the onboard charger, a second recharge process corresponding to the second recharging mode when the second recharging mode is identified.

2. The method according to claim 1 , wherein the first recharging mode is a quick recharging mode, and the second recharging mode is a slow recharging mode.

3. The method according to claim 2 , wherein the duty cycle corresponding to the first recharging mode is less than the duty cycle corresponding to the second recharging mode.

4. The method according to claim 1 , further comprising determining that recharging is completed when a duty cycle of the pulse width modulation signal is 100%.

5. The method according to claim 1 , wherein the first recharging mode is a slow recharging mode, and the second recharging mode is a quick recharging mode.

6. The method according to claim 5 , wherein the duty cycle corresponding to the first recharging mode is greater than the duty cycle corresponding to the second recharging mode.

7. A method for automatically selecting a recharging mode of a charger, the method comprising:

displaying a predetermined recharging mode selection image for receiving a selection of a recharging mode;

displaying a predetermined automatic recharging conversion mode selection image for checking whether a current mode is automatically converted into a second recharging mode when a recharging mode selected via the recharging mode selection image is a first recharging mode;

generating and transmitting a pulse width modulation signal by a communication unit having a duty cycle corresponding to the first recharging mode when automatic recharging conversion is activated via the automatic recharging conversion mode selection image; and

generating and transmitting a pulse width modulation signal having a duty cycle corresponding to the second recharging mode when a first recharge process corresponding to the first recharging mode fails.

8. The method according to claim 7 , wherein the pulse width modulation signal is transmitted to an electric vehicle through a control pilot port included in a connector of the charger.

9. The method according to claim 7 , wherein the first recharging mode is a quick recharging mode, and the second recharging mode is a slow recharging mode.

10. The method according to claim 9 , wherein the duty cycle corresponding to the first recharging mode is less than the duty cycle corresponding to the second recharging mode.

11. The method according to claim 7 , further comprising generating and transmitting the pulse width modulation signal with a duty cycle of 100% upon completing recharging in the first recharging mode or the second recharging mode.

12. The method according to claim 7 , wherein the first recharging mode is a slow recharging mode, and the second recharging mode is a quick recharging mode.

13. The method according to claim 12 , wherein the duty cycle corresponding to the first recharging mode is greater than the duty cycle corresponding to the second recharging mode.

14. An electric vehicle recharging system comprising:

an onboard charger identifying a recharging mode based on a duty cycle of a pulse width signal received from a control pilot port of an external charger;

a power line communication controller of a vehicle being activated by the onboard charger, performing power line communication with the external charger when the identified recharging mode by the onboard charger is a quick recharging mode; and

a battery being recharged by the onboard charger with power received from the external charger according to the identified recharging mode,

wherein, upon determining, by the power line communication controller, that a predetermined quick recharge process corresponding to the quick recharging mode fails, the onboard charger automatically switches the quick recharging mode into a slow recharging mode based on a duty cycle of the pulse width modulation signal.

15. The electric vehicle recharging system according to claim 14 , wherein the quick recharge process is performed via the power line communication using the control pilot port.

16. The electric vehicle recharging system according to claim 14 , wherein power received from the external charger is transmitted to the battery through the onboard charger when the current mode is converted into the slow recharging mode.

17. The electric vehicle recharging system according to claim 14 , wherein the power line communication controller terminates the power line communication with the external charger when the current mode is converted into the slow recharging mode.

18. The electric vehicle recharging system according to claim 14 , wherein the duty cycle of the pulse width modulation signal corresponding to the quick recharging mode is less than the duty cycle of the pulse width modulation signal corresponding to the slow recharging mode.

19. A charger for automatically selecting a recharging mode, comprising:

a display unit displaying a predetermined recharging mode selection image for receiving a selection of a recharging mode and a predetermined automatic recharging conversion mode selection image for determining whether a first charging mode is automatically converted into a second recharging mode when a recharging mode selected via the recharging mode selection image is the first charging mode;

a communication unit transmitting and receiving a power line communication signal to and from an electric vehicle, generating a pulse width modulation signal, and transmitting the pulse width modulation signal to the electric vehicle; and

a controller controlling the communication unit so as to generate and transmit a pulse width modulation signal having a duty cycle corresponding to the first recharging mode when automatic recharging conversion is activated via the automatic recharging conversion mode selection image, and controlling the communication unit so as to generate and transmit a pulse width modulation signal having a duty cycle corresponding to the second recharging mode when a first recharge process corresponding to the first recharging mode fails.

20. The charger according to claim 19 , wherein the first recharging mode is a quick recharging mode, and the second recharging mode is a slow recharging mode.

21. The charger according to claim 20 , wherein the duty cycle corresponding to the first recharging mode is less than the duty cycle corresponding to the second recharging mode.

22. The charger according to claim 19 , wherein the controller controls the communication unit so as to generate and transmit the pulse width modulation signal with a duty cycle of 100% upon completing recharging in the first recharging mode or the second recharging mode.

23. The charger according to claim 19 , wherein the first recharging mode is a slow recharging mode, and the second recharging mode is a quick recharging mode.

24. The charger according to claim 23 , wherein the duty cycle corresponding to the first recharging mode is greater than the duty cycle corresponding to the second recharging mode.