Charge and discharge system, vehicle, and control method for charge and discharge system

A vehicle comprising:

• a charge and discharge system capable of performing charging and discharging from and to an external device;
• an inlet connected with a connector that supplies electric power from the external device;
• an outlet connected with a plug that discharges electric power to the external device;
• and
• an electrical storage device configured to store electric power, wherein
• the charge and discharge system has;
• a charge and discharge circuit configured to convert electric power from the inlet to direct-current power compatible with the electrical storage device and convert direct-current power of the electrical storage device to electric power that is discharged from the outlet,
• a switching system configured to switch between a state where the charge and discharge circuit and the inlet are electrically connected and a state where the charge and discharge circuit and the outlet are electrically connected,
• a controller configured to control the switching system,
• a first voltage sensor configured to detect an alternating-current voltage and a direct-current voltage at the inlet;
• and
• a second voltage sensor configured to detect an alternating-current voltage and a direct-current voltage at the outlet, wherein
• the controller is configured to:
• determine that the switching system has a failure on condition that an alternating-current voltage has been detected by the first voltage sensor at the inlet and an alternating-current voltage has been detected by the second voltage sensor at the outlet, and disable charging and discharging;
• determine that the switching system has no failure on condition that an alternating-current voltage has been detected by the first voltage sensor at the inlet and a direct-current voltage has been detected by the second voltage sensor at the outlet, and enable charging and discharging;
• and
• determine that the switching system has a failure on condition that a direct-current voltage has been detected by the first voltage sensor at the inlet and a direct-current voltage has been detected by the second voltage sensor at the outlet, and disable charging and discharging.

A control method for a charge and discharge system capable of performing charging and discharging from and to an external device,

• the charge and discharge system including
• a charge and discharge circuit configured to convert electric power from an inlet to direct-current power compatible with an electrical storage device configured to store electric power and convert direct-current power of the electrical storage device to electric power that is discharged from an outlet, the inlet being connected with a connector that supplies electric power from the external device, and the outlet being connected with a plug that discharges electric power to the external device;
• a switching system configured to switch between a state where the charge and discharge circuit and the inlet are electrically connected and a state where the charge and discharge circuit and the outlet are electrically connected;
• a controller configured to control the switching system;
• a first voltage sensor configured to detect a voltage of electric power and a direct-current voltage at the inlet;
• and
• a second voltage sensor configured to detect a voltage of electric power and a direct-current voltage at the outlet,
• the control method comprising:
• determining, by the controller, that the switching system has a failure on condition that an alternating-current voltage has been detected by the first voltage sensor at the inlet and an alternating-current voltage has been detected by the second voltage sensor at the outlet;
• determining, by the controller, that the switching system has no failure on condition that an alternating-current voltage has been detected by the first voltage sensor at the inlet and a direct-current voltage has been detected by the second voltage sensor at the outlet, and enable charging and discharging;
• determining, by the controller, that the switching system has a failure on condition that a direct-current voltage has been detected by the first voltage sensor at the inlet and a direct-current voltage has been detected by the second voltage sensor at the outlet, and disable charging and discharging;
• and
• disabling charging and discharging, by the controller, when it is determined that the switching system has a failure.