Energy supply device for a hybrid vehicle and method for operating an electric high voltage energy storage device
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.
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 a state of charge 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 a state of charge 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.