Vehicle charging apparatus

1. A vehicle charging apparatus mounted on a vehicle for charging an on-vehicle battery from an external power supply with a charging plug connected to the vehicle, the vehicle charging apparatus comprising:

a communication device having an electronic control unit, the electronic control unit being configured to:

perform communication with a charging facility providing the external power supply with the charging plug connected and locked to the vehicle, and

to prohibit disconnection of the communication when an unlocking operation to unlock the charging plug is executed during charging from the external power supply to the on-vehicle battery,

wherein the electronic control unit is configured to perform the communication based on an OSI reference model having a layered structure, the layered structure including an Application layer, a Session layer, and layers therebelow,

wherein the electronic control unit is configured to prohibit disconnection of the communication by stopping communication in the Application layer of the OSI reference model, while retaining an established state of a communication session in the Session layer and the layers therebelow.

2. The vehicle charging apparatus according to claim 1 , wherein the electronic control unit is configured to disconnect the communication when the unlocking operation is executed continuously for a predetermined time period during charging from the external power supply to the on-vehicle battery.

3. The vehicle charging apparatus according to claim 1 , wherein the electronic control unit is configured to disconnect the communication when the charging plug is physically removed from the vehicle during charging from the external power supply to the on-vehicle battery.

4. The vehicle charging apparatus according to claim 1 , wherein the electronic control unit is configured to disconnect the communication session in the Session layer and the layers therebelow in the OSI reference model based on which the communication is performed.

5. The vehicle charging apparatus according to claim 1 , wherein the electronic control unit is configured to:

perform communication with the charging facility in the Application layer in the OSI reference model based on which the communication is performed after performing communication for user verification and authentication with the charging facility when the charging plug is connected and locked to the vehicle, and

resume the communication in the Application layer without performing the communication for user verification and authentication when an unlocking operation to unlock the charging plug is executed during charging from the external power supply to the on-vehicle battery but the unlocking operation is cancelled without being continued for the predetermined time period, and the charging plug is locked again.

6. The vehicle charging apparatus according to claim 1 , wherein the electronic control unit is configured to communicate information on an amount of charged electricity with the charging facility in the Application layer in the OSI reference model based on which the communication is performed, during charging from the external power supply to the on-vehicle battery.

7. The vehicle charging apparatus according to claim 1 , further comprising a charge controller that is configured to perform charging from the external power supply to the on-vehicle battery when the charging plug is connected and locked to the vehicle, and a user verification and authentication are successful through communication between the communication device and the charging facility.

8. The vehicle charging apparatus according to claim 7 , wherein the charge controller is configured to suspend the charging from the external power supply to the on-vehicle battery when an unlocking operation to unlock the charging plug is executed during charging from the external power supply to the on-vehicle battery.