Plug-in hybrid electric vehicle battery state of charge hold function and energy management

• US 9,764,632 B2
• Filed: 01/07/2011
• Issued: 09/19/2017
• Est. Priority Date: 01/07/2010
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Yu, Hai, Kuang, Ming Lang, McGee, Ryan, Supina, Joseph G., Kristinsson, Johannes G., Syed, Fazal U.
• Primary Examiner(s): Edwards, Jerrah
• Assistant Examiner(s): Han, Charles J
• Application Number:
  US12/986,632
• Publication Number:
  US 20110166733A1
• Time in Patent Office: 2,447 Days
• Field of Search: 701 1, 701 36, 701 50
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• 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 2540/215 Selection or confirmation of options
• CPC Class Codes: B60W 2710/244 Charge state
• CPC Class Codes: B60W 50/082 Selecting or switching between different modes of propelling
• CPC Class Codes: Y02T 10/40 Engine management systems
• 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

A plugin hybrid electric vehicle includes an internal combustion engine, a battery, an electric machine, and a controller. The vehicle is operable in a primary electric vehicle driving mode (EV mode) and in a hybrid electric vehicle driving mode (HEV mode). The controller is programmed to receive input from the driver representing a desired operating mode and a desired energy reservation. If the desired operating mode is HEV mode, then a state of charge (SOC) offset is established as the smaller of a maximum SOC offset and an allowable SOC offset, otherwise, the SOC offset is established based on the desired energy reservation. The vehicle is operated based on the SOC offset.

Claims

1. A method of controlling a plugin hybrid electric vehicle including an internal combustion engine, a battery, and an electric machine, the vehicle being operable in a primary electric vehicle driving mode (EV mode) and in a hybrid electric vehicle driving mode (HEV mode), the method comprising:

receiving driving mode input from the driver selecting the EV mode or the HEV mode;

receiving energy reservation input from the driver specifying a desired energy reservation;

in response to the HEV mode being selected, establishing a state of charge (SOC) offset as the lesser of a maximum SOC offset and an allowable SOC offset;

in response to the EV mode being selected, establishing the SOC offset based on the desired energy reservation; and

operating the vehicle based on the SOC offset.

2. The method of claim 1 wherein the desired energy reservation is an absolute energy amount.

3. The method of claim 1 wherein the desired energy reservation is a relative SOC level with respect to a minimum charge sustaining SOC.

4. The method of claim 1 wherein the allowable SOC offset is based on a minimum charge sustaining SOC and a present SOC when the driver requests HEV mode.

5. The method of claim 1 wherein establishing the SOC offset based on the desired energy reservation is further based on a minimum charge sustaining SOC and a present SOC.

6. The method of claim 1 wherein operating the vehicle based on the SOC offset further comprises:

determining an energy management battery SOC as a present SOC less the SOC offset; and

operating the vehicle based on the energy management battery SOC.

7. The method of claim 6 wherein operating the vehicle based on the energy management battery SOC further comprises:

operating the vehicle in battery charge depletion mode when the energy management battery SOC is greater than a minimum charge sustaining SOC.

8. The method claim 6 wherein operating the vehicle based on the energy management battery SOC further comprises:

operating the vehicle in battery charge sustaining mode when the energy management battery SOC is not greater than a minimum charge sustaining SOC.

9. A plugin hybrid electric vehicle including an internal combustion engine, a battery, and an electric machine, the vehicle being operable in a primary electric vehicle driving mode (EV mode) and in a hybrid electric vehicle driving mode (HEV mode), the vehicle further comprising a controller programmed to:

receive driving mode input from the driver selecting the EV mode or the HEV mode;

receive energy reservation input from the driver specifying a desired energy reservation;

in response to the HEV mode being selected, then establish a state of charge (SOC) offset as the lesser of a maximum SOC offset and an allowable SOC offset;

in response to the EV mode being selected, establish the SOC offset based on the desired energy reservation; and

operate the vehicle based on the SOC offset.

10. The vehicle of claim 9 wherein the desired energy reservation is an absolute energy amount.

11. The vehicle of claim 9 wherein the desired energy reservation is a relative SOC level with respect to a minimum charge sustaining SOC.

12. The vehicle of claim 9 wherein the allowable SOC offset is based on a minimum charge sustaining SOC and a present SOC when the driver requests HEV mode.

13. The vehicle of claim 9 wherein establishing the SOC offset based on the desired energy reservation is further based on a minimum charge sustaining SOC and a present SOC.

14. The vehicle of claim 9 wherein operating the vehicle based on the SOC offset further comprises:

determining an energy management battery SOC as a present SOC less the SOC offset; and

operating the vehicle based on the energy management battery SOC.

15. The vehicle of claim 14 wherein operating the vehicle based on the energy management battery SOC further comprises:

operating the vehicle in battery charge depletion mode when the energy management battery SOC is greater than a minimum charge sustaining SOC.

16. The vehicle of claim 14 wherein operating the vehicle based on the energy management battery SOC further comprises:

operating the vehicle in battery charge sustaining mode when the energy management battery SOC is not greater than a minimum charge sustaining SOC.

17. A hybrid electric vehicle operable in an electric mode and in a hybrid mode, comprising a controller programmed to:

receive driving mode input selecting the electric mode or the hybrid mode;

receive energy reservation input specifying a desired energy reservation; and

operate the vehicle based on an SOC offset, wherein, when the operating mode is selected as the hybrid mode, the SOC offset is the smaller of a maximum SOC offset and an allowable SOC offset, otherwise, the SOC offset is based on the specified energy reservation.

18. The vehicle of claim 17 wherein operating the vehicle based on the SOC offset further comprises:

determining an energy management battery SOC as a present SOC less the SOC offset; and

operating the vehicle based on the energy management battery SOC.