ELECTRIC CHARGING SYSTEM AND ELECTRIC VEHICLE

• US 20130127414A1
• Filed: 11/06/2012
• Published: 05/23/2013
• Est. Priority Date: 11/18/2011
• Status: Active Grant

• Current Assignee: Subaru Corp.
• Original Assignee: Fuji Jukogyo KK (Subaru Corp.)
• Inventors: OHTOMO, Yosuke
• Granted Patent: US 8,860,368 B2
• Time in Patent Office: Days
• US Class Current: 320/109
• CPC Class Codes: B60L 3/0069 relating to the isolation, e.g. ground fault or leak current
• CPC Class Codes: B60L 53/62 in response to charging parameters, e.g. current, voltage or electrical charge
• CPC Class Codes: B60L 53/66 Data transfer between charging stations and vehicles
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles

Abstract

In an electric charging system (and electric vehicle), Electric-charger-side data Ds are calculated by subjecting an electric-charger-side supplied voltage Vs to filter processing, and electric-vehicle-side data Dr are calculated by subjecting an electric-vehicle-side received voltage Vr to filter processing. A reference point α1 is set for the electric-charger-side data Ds on the basis of the variation in the rise rate of the electric-charger-side data Ds. Likewise, a reference point α2 is set for the electric-vehicle-side data Dr based on variation in the rise rate of the electric-vehicle-side data Dr. When an insulation failure between the electric charger and the electric vehicle is determined, a time lag T between the electric-charger-side data Ds and the electric-vehicle-side data Dr is calculated based on the reference points α1 and α2, and the electric-charger-side data Ds and the electric-vehicle-side data Dr that are synchronized based on the time lag T are compared.

Claims

1. An electric charging system in which an electric charger and an electric vehicle are connected by a charging cable, and an electric storage device installed in the electric vehicle is charged, the electric charging system comprising:

a first reference setting unit for setting a reference point on the basis of a variation rate of supply-side processing data, the reference point being set with respect to the supply-side processing data that are calculated by subjecting a supplied voltage, a supplied current, or a supplied power at the electric charger side to a predetermined filter processing;

a second reference setting unit for setting a reference point on the basis of a variation rate of reception-side processing data, the reference point being set with respect to the reception-side processing data that are calculated by subjecting a received voltage, a received current, or a received power at the electric vehicle side to a predetermined filter processing;

a data synchronization unit for synchronizing the supply-side processing data and the reception-side processing data on the basis of the reference points of the supply-side processing data and the reception-side processing data; and

a determination unit for comparing the synchronized supply-side processing data and reception-side processing data and determining whether or not a power supply state between the electric charger and the electric vehicle is normal.

2. The electric charging system according to claim 1, wherein

the electric charger performs constant-current charging in which the supplied current is raised to a predetermined current and then held at the predetermined current;

the first reference setting unit detects a difference in a variation rate of the supply-side processing data between a rising process and a holding process of the supplied current and sets the reference point for the supply-side processing data at a portion thereof where switching from the rising process to the holding process occurs; and

the second reference setting unit detects a difference in a variation rate of the reception-side processing data between a rising process and a holding process of the supplied current and sets the reference point for the reception-side processing data at a portion thereof where switching from the rising process to the holding process occurs.

3. The electric charging system according to claim 1, wherein

the data synchronization unit calculates a time lag between the supply-side processing data and the reception-side processing data on the basis of the reference points and synchronizes the supply-side processing data and the reception-side processing data on the basis of the time lag.

4. The electric charging system according to claim 2, wherein

the data synchronization unit calculates a time lag between the supply-side processing data and the reception-side processing data on the basis of the reference points and synchronizes the supply-side processing data and the reception-side processing data on the basis of the time lag.

5. An electric vehicle provided with an electric storage device connected to an electric charger by a charging cable and charged by the electric charger, the vehicle comprising:

a first reference setting unit for setting a reference point on the basis of a variation rate of supply-side processing data, the reference point being set with respect to the supply-side processing data that are calculated by subjecting a supplied voltage, a supplied current, or a supplied power at the electric charger side to a predetermined filter processing;

a second reference setting unit for setting a reference point on the basis of a variation rate of reception-side processing data, the reference point being set with respect to the reception-side processing data that are calculated by subjecting a received voltage, a received current, or a received power at the electric vehicle side to a predetermined filter processing;

a data synchronization unit for synchronizing the supply-side processing data and the reception-side processing data on the basis of the reference points of the supply-side processing data and the reception-side processing data; and

a determination unit for comparing the synchronized supply-side processing data and reception-side processing data and determining whether or not a power supply state between the electric charger and the electric vehicle is normal.

6. The electric vehicle according to claim 5, wherein

the electric charger performs constant-current charging in which the supplied current is raised to a predetermined current and then held at the predetermined current;

the first reference setting unit detects a difference in a variation rate of the supply-side processing data between a rising process and a holding process of the supplied current and sets the reference point for the supply-side processing data at a portion thereof where switching from the rising process to the holding process occurs; and

the second reference setting unit detects a difference in a variation rate of the reception-side processing data between a rising process and a holding process of the supplied current and sets the reference point for the reception-side processing data at a portion thereof where switching from the rising process to the holding process occurs.

7. The electric vehicle according to claim 5, wherein

the data synchronization unit calculates a time lag between the supply-side processing data and the reception-side processing data on the basis of the reference points and synchronizes the supply-side processing data and the reception-side processing data on the basis of the time lag.

8. The electric vehicle according to claim 6, wherein

the data synchronization unit calculates a time lag between the supply-side processing data and the reception-side processing data on the basis of the reference points and synchronizes the supply-side processing data and the reception-side processing data on the basis of the time lag.