Ground fault protection for charging system and electrically powered vehicle

Patent metadata

Field	Value
Publication number	US-10471830-B2
Application number	US-201715686841-A
Country	US
Kind code	B2
Filing date	Aug 25, 2017
Priority date	Aug 30, 2016
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

An ECU performs a program including: during charging, when abnormality information has been received, bringing each of an SMR and a CHR into an OFF state; when a charging connector is disconnected and when a vehicle is in a Ready-On state, starting a ground fault detection process; when it is determined that a ground fault has occurred on the vehicle side, performing a display process (1); and in the state where it is not determined that a ground fault has occurred on the vehicle side, when a prescribed detection time period has elapsed, performing a display process (2).

First claim

What is claimed is:

1. A charging system comprising:
an electrically powered vehicle provided with a power storage device configured to supply electric power to a driving motor; and
a charging facility provided external to the electrically powered vehicle and configured to charge the power storage device,
the charging facility including
a power supply,
a charging connector that is connectable to the electrically powered vehicle,
a charger configured to charge the power storage device using electric power of the power supply when the charging connector is connected to the electrically powered vehicle, and
a first detector for detecting, during charging of the power storage device, a ground fault in a charging path extending from the power supply to the power storage device,

the charging facility being configured to, when the ground fault is detected by the first detector during charging, stop charging of the power storage device and transmit abnormality information indicating occurrence of the ground fault to the electrically powered vehicle,
the charging path including
(i) a first path for connecting the power supply and the charging connector, and
(ii) a second path for connecting the first path and the power storage device when the charging connector is connected to the electrically powered vehicle, and

the electrically powered vehicle including
a second detector for detecting a ground fault in the second path, and
a second controller configured to, when the abnormality information is received from the charging facility, perform ground fault detection using the second detector after the charging connector is disconnected.

2. The charging system according to claim 1 , wherein
the electrically powered vehicle further includes a notifier for notifying a user of information, and
the notifier is configured to, when the abnormality information is received, notify a user of information that varies depending on whether or not the ground fault in the second path is detected.

3. The charging system according to claim 1 , wherein the ground fault detection is performed after the charging connector is disconnected from an inlet of the electrically powered vehicle.

4. An electrically powered vehicle comprising:
a driving motor for driving the electrically powered vehicle;
a power storage device configured to supply electric power to the driving motor;
a detector for detecting a ground fault in the electrically powered vehicle; and
a controller configured to perform ground fault detection using the detector, when abnormality information indicating a ground fault is received from a charging facility during charging of the power storage device using the charging facility, the ground fault detection being performed after the electrically powered vehicle and the charging facility are disconnected from each other, the charging facility being provided external to the electrically powered vehicle.

5. The electrically powered vehicle according to claim 4 , further comprising a notifier for notifying a user of information, wherein
the notifier is configured to, when the abnormality information is received, notify a user of information that varies depending on whether or not the ground fault in the electrically powered vehicle is detected.

6. The electrically powered vehicle according to claim 4 , wherein the ground fault detection is performed after the charging facility is disconnected from an inlet of the electrically powered vehicle.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kojima Koichi

Classifications

• B60L53/66

  Data transfer between charging stations and vehicles · CPC title

• B60Y2300/91

  Battery charging · CPC title

• B60L3/00

  Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption (methods or circuit arrangements for monitoring or controlling batteries or fuel cells B60L58/00) · CPC title

• B60L2250/10

  by alarm · CPC title

• B60L58/12

  responding to state of charge [SoC] · CPC title