Charging system for vehicle and method for controlling charging system

• US 8,604,751 B2
• Filed: 02/03/2009
• Issued: 12/10/2013
• Est. Priority Date: 02/03/2009
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Mitsutani, Noritake
• Primary Examiner(s): WILLIAMS, ARUN C
• Application Number:
  US13/146,894
• Publication Number:
  US 20110309793A1
• Time in Patent Office: 1,771 Days
• Field of Search: 320/109
• US Class Current: 320/109
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 2210/14 Boost converters
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2220/14 Synchronous machines
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/04 Cutting off the power supply under fault conditions protective devices and circuit arrangements in general H01H; H02H
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• CPC Class Codes: B60L 53/22 Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 58/18 of two or more battery modules
• CPC Class Codes: B60L 58/20 having different nominal voltages
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/50 Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode
• CPC Class Codes: B60W 2510/244 : Charge state
• CPC Class Codes: H02J 7/00 : Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00309 : Overheat or overtemperature protection
• CPC Class Codes: Y02T 10/62 : Hybrid 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 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 : Electric charging stations
• CPC Class Codes: Y02T 90/14 : Plug-in electric vehicles

Abstract

A charge control device includes a charge power detection unit for detecting charge power supplied to a power storage device; a target value determination unit for determining a target value of the charge power to the power storage device; a feedback control unit for correcting the target value based on a difference between the charge power and the target value to generate the power command value; a supply power detection unit for detecting supply power output from the charger; and a charge abnormality monitoring unit for, in a case where the charge power is decreased below a first threshold value and the supply power is decreased below a second threshold value, confirming a diagnosis that an abnormality occurs in the charger when the target value falls within an abnormality detectable range, and suspending performing a diagnosis of an abnormality in the charger when the target value is out of the abnormality detectable range.

Claims

1. A charging system for a vehicle for charging a power storage device mounted in the vehicle, said charging system comprising:

a charger configured to supply electric power from a power supply external to the vehicle so as to charge said power storage device; and

a charge control device for controlling said charger by generating a power command value to said charger,

said charge control device including

a charge power detection unit for detecting charge power supplied to said power storage device,

a target value determination unit for determining a target value of the charge power to said power storage device,

a feedback control unit for correcting said target value based on a difference between said charge power and said target value to generate said power command value,

a supply power detection unit for detecting supply power output from said charger, and

a charge abnormality monitoring unit for, in a case where said charge power is decreased below a first threshold value and said supply power is decreased below a second threshold value, confirming a diagnosis that an abnormality occurs in said charger when said target value falls within an abnormality detectable range, and suspending performing a diagnosis of an abnormality in said charger when said target value is out of the abnormality detectable range.

2. The charging system for a vehicle according to claim 1, wherein, in the case where said charge power is decreased below the first threshold value and said supply power is decreased below the second threshold value, said charge abnormality monitoring unit confirms a diagnosis that an abnormality occurs in said charger and stops an operation of said charger when said target value falls within the abnormality detectable range, and suspends performing a diagnosis of an abnormality in said charger and stops the operation of said charger when said target value is out of the abnormality detectable range.

3. The charging system for a vehicle according to claim 1, wherein

said vehicle includes an auxiliary machine capable of being driven by a part of the electric power output from said charger,

said power storage device includes

a first power storage device connected to a power supply path to said auxiliary machine, and

a second power storage device to which an output of said charger is connected,

said charging system for a vehicle further includes

a first voltage converter performing voltage conversion between a voltage of said first power storage device and a supply voltage to an electric load, and

a second voltage converter performing voltage conversion between a voltage of said second power storage device and said supply voltage, and

said charge control device is configured to control said first and second voltage converters to select one of said first and second power storage devices as a target to be supplied with said charge power from said charger.

4. The charging system for a vehicle according to claim 1, wherein

said vehicle includes

a motor for driving the vehicle, said motor operating with the electric power received from said power storage device, and

an internal combustion engine used for driving the vehicle in combination with said motor.

5. A method for controlling a charging system for charging a power storage device mounted in a vehicle,

said charging system including

a charger configured to supply electric power from a power supply external to the vehicle so as to charge said power storage device, and

a charge control device for controlling said charger by generating a power command value to said charger, and

said charge control device including

a charge power detection unit for detecting charge power supplied to said power storage device,

a target value determination unit for determining a target value of the charge power to said power storage device,

a feedback control unit for correcting said target value based on a difference between said target value and said charge power to generate said power command value, and

a supply power detection unit for detecting supply power output from said charger, said method comprising the steps of:

determining whether said charge power is decreased below a first threshold value and said supply power is decreased below a second threshold value; and

confirming a diagnosis that an abnormality occurs in said charger when said target value falls within an abnormality detectable range, and suspending performing a diagnosis of an abnormality in said charger to shut down a system when said target value is out of the abnormality detectable range.