Energy Supply Device for a Hybrid Vehicle and Method for Operating an Electric High Voltage Energy Storage Device

• US 20090205890A1
• Filed: 02/12/2009
• Published: 08/20/2009
• Est. Priority Date: 02/16/2008
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: Boeckl, Michael, Diegelmann, Christian, Scharner, Sebastian
• Granted Patent: US 9,166,443 B2
• Time in Patent Office: Days
• US Class Current: 180/65.275
• CPC Class Codes: B60L 2250/18 by enquiring driving style
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: H02J 7/1446 in response to parameters of a vehicle
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/92 Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Abstract

A method for operating an electric high voltage energy storage device of a hybrid vehicle with an electric drive motor, as well as an energy supply device, is provided. A predetermined working range of the high voltage energy storage device is shifted in the direction of the upper or lower physical charge limit as a function of the vehicle operating parameters and/or as a function of the vehicle environmental parameters.

Claims

1. A method for operating an electric high voltage energy storage device of a hybrid vehicle with an electric drive motor, comprising:

operating the characterized electric high voltage energy storage device in a predetermined working range of the high voltage energy storage device that is defined by an upper limit and a lower limit; and

shifting the predetermined working range as a function of at least one of vehicle operating parameters and vehicle environmental parameters.

2. The method as claimed in claim 1, wherein

the working range is shifted by shifting the lower limit while retaining the upper limit.

3. The method as claimed in claim 1, wherein

the working range is shifted by shifting the upper limit and the lower limit.

4. The method as claimed in claim 3, wherein

the size of the working range remains unchanged during the shifting step.

5. The method as claimed in claim 1, wherein

one of the vehicle operating parameters is a state of ageing of the high voltage energy storage device.

6. The method as claimed in claim 5, wherein

the state of ageing is determined by at least one of a predetermined computational algorithm, as a function of an operating period of the energy storage device, and as a function of an energy throughput through the energy storage device.

7. The method as claimed claim 1, wherein

one of the vehicle environmental parameters is an outside temperature which is determined at least one of continuously and over a predetermined period of time.

8. The method as claimed in claim 7, wherein

a predetermined minimum temperature is determined at least one of as a function of the outside temperature determined continuously, and as a function of the outside temperature determined over a predetermined period of time.

9. The method as claimed in claim 8, wherein

the outside temperature is used to determine a current seasonal environment to permit selection of the predetermined minimum temperature from among at least two predetermined seasonal minimum temperature values.

10. The method as claimed in claim 1, wherein

one of the vehicle operating parameters is a current operating mode of the motor vehicle.

11. The method as claimed in claim 10, wherein

the current operating mode is one of pure internal combustion engine operation, purely electrical driving, brake energy recovery and boost mode.

12. An energy supply device for a hybrid vehicle with an electric drive motor, comprising:

a high voltage energy storage device arranged to supply energy to the electric drive motor; and

a control unit controlling charging and discharging events of the energy storage device, wherein the control unit controls a predetermined working range of the high voltage energy storage device that is defined by an upper limit and a lower limit by shifting the predetermined working range as a function of at least one of vehicle operating parameters and vehicle environmental parameters.

13. The energy supply device as claimed in claim 12, wherein

the control unit shifts the working range by shifting the lower limit and while retaining the upper limit.

14. The energy supply device as claimed in claim 12, wherein

the control unit shifts the working range by shifting the upper limit and the lower limit.

15. The energy supply device as claimed in claim 12, wherein

the energy storage device includes lithium ion energy storage elements.

16. The energy supply device as claimed in claim 12, wherein

the control unit shifts the working range as a function of at least one of a state of ageing of the high voltage energy storage device, as a function of at least one of an outside and a vehicle ambient temperature, and as a function of an operating mode of the hybrid vehicle.