Method and system for more efficient operation of plug-in electric vehicles

• US 9,428,076 B2
• Filed: 10/06/2014
• Issued: 08/30/2016
• Est. Priority Date: 02/03/2010
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Motor Engineering & Manufacturing North America Incorporated (Toyota Motor Corporation)
• Inventors: Fleming, Matthew Eugene, Francisco, Avernethy
• Primary Examiner(s): Badii, Behrang
• Assistant Examiner(s): GREENE, DANIEL LAWSON
• Application Number:
  US14/507,370
• Publication Number:
  US 20150025730A1
• Time in Patent Office: 694 Days
• Field of Search: 701/22
• US Class Current: 1/1
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• 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 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: G16Z 99/00 Subject matter not provided for in other main groups of this subclass
• 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 90/14 Plug-in electric vehicles

Abstract

An automobile having an energy conversion unit, an energy storage unit, a user selection unit, a global positioning system, and a control unit. The automobile can operate in a default charging mode, which is either the charge depletion mode or the charge sustaining mode. Upon a user input, the energy conversation unit and/or the energy storage unit can operate in an extended charging mode or a forced charging mode. In the extended charging mode, the state of charge (SOC) is increased or decreased over a predetermined charging range. In the forced charging mode, the SOC is increased until a predetermined charge limit is reached. The automobile can also use global positioning system signals to operate in the charge depletion mode, the charge sustaining mode, the extended charging mode, and/or the forced charging mode.

Claims

1. A method for operating an automobile having an energy storage unit with a state of charge and an energy conversion unit for powering the automobile, the method comprising:

configuring the automobile to operate in a charge depletion mode that decreases the state of charge of the energy storage unit due to energy being provided by the energy storage unit to power the automobile;

configuring the automobile to operate in a charge sustaining mode that maintains the state of charge of the energy storage unit within a first charging range by powering the automobile using energy from the energy conversion unit; and

configuring the automobile to operate in an extended charging mode that asynchronously increases the state of charge of the energy storage unit using energy from the energy conversion unit to charge the energy storage unit and decreases the state of charge of the energy storage unit to power the automobile to maintain the state of charge of the energy storage unit within a second charging range that is greater than the first charging range.

2. The method of claim 1, further comprising configuring the automobile to operate in the extended charging mode when a user selects the extended charging mode.

3. The method of claim 1, further comprising:

determining or receiving positioning data related to at least one of a location of the automobile, a location of a destination or a distance between the automobile and the destination; and

configuring the automobile to operate in the charge depletion mode, the charge sustaining mode or the extended charging mode based on at least the positioning data.

4. The method of claim 1, wherein

the first charging range is between a first state of charge limit value and a second state of charge limit value,

the second charging range is between a third state of charge limit value and a fourth state of charge limit value, and

the fourth state of charge limit value is greater than the second state of charge limit value.

5. The method of claim 1, wherein

the first charging range is between a first state of charge limit value and a second state of charge limit value,

the second charging range is between a third state of charge limit value and a fourth state of charge limit value, and

the third state of charge limit value is greater than or equal to the first state of charge limit value and less than or equal to the second state of charge limit value.

6. The method of claim 1, wherein configuring the extended charging mode to asynchronously increase and decrease the state of charge of the energy storage unit within the second charging range is based on at least one of a condition of the automobile or a preference of a user of the automobile.

7. The method of claim 6, further comprising:

receiving, using a user selection unit of the automobile, a user input; and

determining the preference of the user of the automobile based on at least the user input.

8. The method of claim 6, wherein the condition of the automobile includes fuel efficiency of an operation of the energy conversion unit or the automobile.

9. The method of claim 1, further comprising configuring the automobile to operate in a forced charging mode that automatically increases the state of charge of the energy storage unit until the state of charge of the energy storage unit reaches a forced charging threshold, and thereafter maintains the state of charge of the energy storage unit at or within a proximity of the forced charging threshold.

10. The method of claim 9, further comprising configuring the automobile to operate in the forced charging mode when a user of the automobile selects the forced charging mode.

11. The method of claim 9, further comprising:

determining or receiving positioning data related to at least one of a location of the automobile, a location of a destination or a distance between the automobile and the destination; and

configuring the automobile to operate in the charge depletion mode, the charge sustaining mode, the extended charging mode or the forced charging mode based on at least the positioning data.

12. The method of claim 1, wherein the first charging range is between a first state of charge limit value and a second state of charge limit value, and a difference between the second state of charge limit value and the first state of charge limit value is less than or equal to 15% of a full state of charge value of the energy storage unit.

13. The method of claim 12, wherein the second charging range is between a third state of charge limit value and a fourth state of charge limit value, and a difference between the fourth state of charge limit value and the third state of charge limit value is less than or equal to 80% of the full state of charge value of the energy storage unit.

14. A method for operating an automobile, comprising:

providing an energy storage unit with a state of charge;

providing an energy conversion unit having an engine for at least one of powering a movement of the automobile, storing energy in the energy storage unit, or powering an electronic device of the automobile; and

configuring the automobile to operate in an extended charging mode that asynchronously increases and decreases the state of charge of the energy storage unit to maintain the state of charge of the energy storage unit within a charging range that is between a first state of charge limit value and a second state of charge limit value.

15. The method of claim 14, wherein the first state of charge limit value is 20% of a full state of charge value of the energy storage unit, and the second state of charge limit value is 80% of the full state of charge value of the energy storage unit.

16. The method of claim 14, further comprising:

determining or receiving positioning data related to at least one of a location of the automobile, a location of a target location, or a distance between the automobile and the target location; and

setting, using the control unit, a current charging mode to the extended charging mode based on at least one of the positioning data or a current state of charge of the energy storage unit.

17. The method of claim 14, further comprising:

configuring the automobile to operate in a default charging mode which includes;

a charge depletion mode that decreases the state of charge of the energy storage unit, and

a charge sustaining mode that maintains the state of charge of the energy storage unit within a first charging range.

18. The method of claim 14, further comprising configuring the automobile to operate in a forced charging mode that automatically increases the state of charge of the energy storage unit until the state of charge of the automobile reaches a forced charging threshold, and thereafter maintains the energy storage unit at or within a proximity of the forced charging threshold.

19. The method of claim 14, further comprising configuring the automobile to operate in the extended charging mode to asynchronously increase and decrease the state of charge of the energy storage unit based on at least one of a condition of the automobile or a preference of a user of the automobile.

20. The method of claim 19, further comprising:

receiving, using a user selection unit of the automobile, a user input; and

determining the preference of the user of the automobile based on at least the user input.

21. The method of claim 19, wherein the condition of the automobile includes energy efficiency of an operation of the energy conversion unit or the automobile.

22. The method of claim 19, further comprising:

determining or receiving positioning data related to at least one of a location of the automobile, a location of a target location or a distance between the automobile and the target location,

wherein configuring the automobile to operate in the extended charging to asynchronously increase and decrease the state of charge of the energy storage unit is based on at least one of the condition of the automobile, the preference of the user of the automobile or the positioning data.

23. The method of claim 22, further comprising:

determining, using the control unit, a current trip of the automobile to the target location based on the positioning data,

wherein the condition of the automobile includes fuel efficiency of an operation of the automobile during the current trip.

24. A method for operating an automobile having an energy conversion unit for powering the automobile, an energy storage unit with a state of charge, and a control unit connected to the energy conversion unit, the method comprising:

configuring the automobile to operate in a charge depletion mode that decreases the state of charge of the energy storage unit due to energy being provided by the energy storage unit to power the automobile;

configuring the automobile to operate in a charge sustaining mode that maintains the state of charge of the energy storage unit within a first charging range by powering the automobile using energy from the energy conversion unit;

configuring the automobile to operate in an extended charging mode that asynchronously increases the state of charge of the energy storage unit using energy from the energy conversion unit to charge the energy storage unit and decreases the state of charge of the energy storage unit to power the automobile to maintain the state of charge of the energy storage unit within a second charging range which is greater than the first charging range; and

configuring the automobile to operate in a forced charging mode that automatically increases the state of charge of the energy storage unit until the state of charge of the energy storage unit reaches a forced charging threshold, and thereafter maintains the energy storage unit at or within a proximity of the forced charging threshold.

25. The method of claim 24, further comprising:

receiving, using a user selection unit of the automobile, a user input; and

configuring the control unit to switch a current charging mode of the automobile from the charge sustaining mode to the forced charging mode based on at least the user input.

26. The method of claim 24, further comprising:

receiving, using a user selection unit of the automobile, a user input; and

configuring the control unit to switch a current charging mode of the automobile from the forced charging mode to the charge depletion mode based on at least the user input.

27. The method of claim 24, further comprising configuring the control unit to automatically switch a current charging mode of the automobile from the forced charging mode to the charge depletion mode.

28. The method of claim 24, further comprising configuring the control unit to automatically switch a current charging mode of the automobile from the charge depletion mode to the forced charging mode.

29. The method of claim 24, wherein the forced charging threshold is a full state of charge value of the energy storage unit.

30. The method of claim 24, further comprising:

configuring a motor of the automobile to power a movement of the automobile using energy from the energy storage unit; and

configuring the charge depletion mode to propel the movement of the automobile using the motor and energy from the energy storage unit.

31. An automobile comprising:

an energy storage unit for storing electrical energy and having a state of charge;

a first energy conversion unit including an engine for powering a movement of the automobile or providing energy to the energy storage unit;

a second energy conversion unit including a motor for moving the automobile using the electrical energy stored in the energy storage unit; and

a control unit connected to the first energy conversion unit and the second energy conversion unit, the control unit configured to;

operate the automobile in a charge depletion mode that decreases the state of charge of the energy storage unit due to energy being provided by the energy storage unit to power the automobile,

operate the automobile in a charge sustaining mode that maintains the state of charge of the energy storage unit within a first charging range by powering the automobile using energy from the energy conversion unit,

operate the automobile in an extended charging mode that asynchronously increases the state of charge of the energy storage unit and decreases the state of charge of the energy storage unit to maintain the state of charge of the energy storage unit within a second charging range which is greater than the first charging range, and

switch a current charging mode from the charge depletion mode to the charge sustaining mode when the state of charge of the energy storage unit reaches a first state of charge threshold.

32. The automobile of claim 31, wherein the control unit is configured to:

determine or receive positioning data related to at least one of a location of the automobile, a location of a target location, or a distance between the automobile and the target location, and

set a current charging mode to the charge depletion mode or the charge sustaining mode based on the positioning data.

33. The automobile of claim 31, wherein the control unit is configured to operate the automobile in a forced charging mode that increases the state of charge of the energy storage unit until the state of charge of the automobile reaches a forced charging threshold, and thereafter maintains the energy storage unit at the forced charging threshold.