Power supply device for vehicle

• US 8,035,247 B2
• Filed: 07/03/2008
• Issued: 10/11/2011
• Est. Priority Date: 07/18/2007
• Status: Expired due to Fees

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ichikawa, Shinji
• Primary Examiner(s): Barnie; Rexford
• Assistant Examiner(s): Fauth; Justen
• Application Number:
  US12/448,174
• Publication Number:
  US 20100078993A1
• Time in Patent Office: 1,195 Days
• Field of Search: None
• US Class Current: 307/10.1
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 1/14 to electric lighting circuits
• CPC Class Codes: B60L 2210/12 Buck converters
• CPC Class Codes: B60L 2210/14 Boost converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2220/14 Synchronous machines
• CPC Class Codes: B60L 2240/34 Cabin temperature
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/525 Temperature of converter or components thereof
• CPC Class Codes: B60L 2240/527 Voltage
• CPC Class Codes: B60L 2250/16 by display
• CPC Class Codes: B60L 3/003 relating to inverters
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• 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 53/14 Conductive energy transfer
• CPC Class Codes: B60L 58/14 Preventing excessive discharging
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60L 58/25 by controlling the electric load
• CPC Class Codes: B60L 7/14 : for vehicles propelled by ac motors
• CPC Class Codes: H01M 10/42 : Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells H01M10/60 takes precedence
• CPC Class Codes: H02H 7/18 : for batteries; for accumulators
• CPC Class Codes: H02J 7/1423 : with multiple batteries
• CPC Class Codes: H02P 2201/07 : DC-DC step-up or step-down converter inserted between the power supply and the inverter supplying the motor, e.g. to control voltage source fluctuations, to vary the motor speed general aspects of plural converters in cascade H02M
• CPC Class Codes: H02P 2201/09 : Boost converter, i.e. DC-DC step up converter increasing the voltage between the supply and the inverter driving the motor general aspects of plural converters in cascade H02M
• CPC Class Codes: Y02E 60/10 : Energy storage using batteries
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility
• 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 power supply device for a vehicle includes a battery, a power line (power supply line and ground line, a connection unit, a charger that is an electric power supply unit, an accessory load, a voltage sensor and a control device. When the accessory load is operating, the control device sends signals to the connection unit to turn off all of three system main relays. Thereby, battery is electrically disconnected from charger. The control device further produces a power command based on a predetermined target voltage and a voltage detected by the voltage sensor such that the detected voltage attains the target voltage.

Claims

1. A power supply device to be mounted on a vehicle, comprising:

a power storage device configured to be chargeable and dischargeable;

a power line;

a connection unit having a connecting state electrically connecting said power storage device to said power line and a disconnecting state electrically isolating said power storage device from said power line;

a power supply unit obtaining a supplied power, from an outside of the vehicle, according to a power command, and providing said supplied power to said power line;

an accessory load connected to said power line;

a voltage detecting unit detecting a voltage on said power line; and

a control device controlling at least said connection unit, said power supply unit and said accessory load, wherein

when said accessory load is driven by said supplied power, said control device sets said connection unit in said disconnecting state, and produces said power command based on a predetermined target value of the voltage on said power line and a result of detecting by said voltage detecting unit such that said detecting result of said voltage detecting unit attains said target value.

2. The power supply device for the vehicle according to claim 1, wherein

said target value is predetermined as a value to be attained by the voltage on said power line when said connection unit is in said disconnecting state and a consumed power of said accessory load is equal to said supplied power.

3. The power supply device for the vehicle according to claim 1, wherein

said control device determines, prior to driving of said accessory load by said supplied power, whether a state value indicating the state of charge of said power storage device is equal to or larger than a predetermined value or not, and sets said connection unit in said disconnecting state when said state value is equal to or larger than said predetermined value.

4. The power supply device for the vehicle according to claim 3, wherein

when said state value is smaller than said predetermined value, said control device sets said connection unit in said connecting state, and produces said power command such that said detecting result of said voltage detecting unit indicates the voltage on said power line attained in the case where said supplied power is larger than a consumed power of said accessory load.

5. The power supply device for the vehicle according to claim 1, wherein

said control device sets said connection unit in said connecting state when said power command indicates a maximum value of said supplied power and said detecting result of said voltage detecting unit indicates that a consumed power of said accessory load is larger than said supplied power.

6. The power supply device for the vehicle according to claim 1, wherein

said control device restricts an operation of said accessory load such that the voltage on said power line attains said target value when said power command indicates a maximum value of said supplied power and said detecting result of said voltage detecting unit indicates that a consumed power of said accessory load is larger than said supplied power.