Electrically powered vehicle and method of controlling electrically powered vehicle

• US 9,956,892 B2
• Filed: 02/28/2013
• Issued: 05/01/2018
• Est. Priority Date: 03/09/2012
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Yamamoto, Masaya, Yasue, Jun
• Primary Examiner(s): Cass, Jean Paul
• Application Number:
  US14/379,006
• Publication Number:
  US 20160001676A1
• Time in Patent Office: 1,888 Days
• Field of Search: 701 22
• CPC Class Codes: B60L 15/20 for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
• CPC Class Codes: B60L 15/2009 for braking
• CPC Class Codes: B60L 15/2045 for optimising the use of energy
• CPC Class Codes: B60L 2210/14 Boost converters
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 2250/10 by alarm
• CPC Class Codes: B60L 2250/16 by display
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 7/0047 with monitoring or indicating devices or circuits
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: H02J 7/00712 the cycle being controlled or terminated in response to electric parameters
• 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 10/72 : Electric energy management in electromobility

Abstract

An electrically powered vehicle includes a power storage device, a motor, a limitation control unit, a notification unit, and a changing unit. The motor generates traveling driving power using electric power output from the power storage device. The limitation control unit limits possible output power, which indicates electric power able to be output from the power storage device, based on a load state of the power storage device. The notification unit notifies a warning when the possible output power is smaller than a threshold value for notifying a driver of decrease of the traveling driving power. The changing unit increases, when the load state of the power storage device is high, the threshold value to be larger than the threshold value when the load state of the power storage device is low.

Claims

1. An electrically powered vehicle comprising:

a power storage device;

a motor that generates traveling driving power using electric power output from said power storage device;

a limitation control unit that limits allowable output power, which is electric power able to be output from said power storage device, based on a discharge load state of said power storage device;

a notification unit that notifies a driver of a decrease of said traveling driving power by generating a warning when said allowable output power is limited by the limitation control unit to a value smaller than a threshold power value for notifying the driver; and

a changing unit that increases, when the discharge load state of said power storage device is high, said threshold power value for notifying the driver to be larger than said threshold power value for notifying the driver when the discharge load state of said power storage device is low.

2. The electrically powered vehicle according to claim 1, further comprising a determining unit that determines the discharge load state of said power storage device based on a predetermined evaluation function indicating a state of said power storage device.

3. The electrically powered vehicle according to claim 2, wherein said evaluation function is an evaluation function that is based on an input/output current of said power storage device.

4. The electrically powered vehicle according to claim 3, wherein said evaluation function is an evaluation function that is based on an integrated value of said input/output current.

5. The electrically powered vehicle according to claim 1, further comprising a determining unit that determines the discharge load state of said power storage device based on said traveling driving power.

6. The electrically powered vehicle according to claim 1, further comprising a determining unit that determines the discharge load state of said power storage device based on a predetermined evaluation function, which indicates a state of said power storage device, and said traveling driving power.

7. The electrically powered vehicle according to claim 6, wherein said evaluation function is an evaluation function that is based on an input/output current of said power storage device.

8. The electrically powered vehicle according to claim 7, wherein said evaluation function is an evaluation function that is based on an integrated value of said input/output current.

9. The electrically powered vehicle according to claim 1, further comprising a determining unit that determines the discharge load state of said power storage device based on an amount of limitation on said allowable output power.

10. The electrically powered vehicle according to claim 1, further comprising a determining unit that determines the discharge load state of said power storage device based on said traveling driving power or a history of an amount of operation on an accelerator pedal.

11. The electrically powered vehicle according to claim 1, wherein said changing unit increases said threshold power value for notifying the driver more as the discharge load state of said power storage device is higher.