SYSTEM AND METHOD FOR OPTIMIZING HYBRID VEHICLE BATTERY USAGE CONSTRAINTS

• US 20150367748A1
• Filed: 08/28/2015
• Published: 12/24/2015
• Est. Priority Date: 03/14/2013
• Status: Active Grant

• Current Assignee: Allison Transmission Incorporated (Allison Transmission Holdings Incorporated)
• Original Assignee: Allison Transmission Incorporated (Allison Transmission Holdings Incorporated)
• Inventors: West, Stephen T., Runde, Jeffrey K., Rues, Aaron
• Granted Patent: US 9,555,719 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 2240/545 Temperature
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 2240/80 Time limits
• CPC Class Codes: B60L 2260/42 by adaptive correction
• CPC Class Codes: B60L 2260/50 by future state prediction
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/12 Recording operating variables ; Monitoring of operating variables
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: B60L 58/16 responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH]
• CPC Class Codes: B60L 58/25 by controlling the electric load
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• 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 2710/246 Temperature
• 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 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

A hybrid system including a hybrid control module for operating the hybrid system to as to have its energy storage device meet a predetermined service life metric is disclosed. The hybrid control module stores experimental information indicative of the impact of certain usage parameters on the service life of the energy storage device, monitors the actual usage parameters observed during operation of the hybrid system, and dynamically determines a maximum operating temperature for the energy storage device in order to increase or decrease its utilization by the hybrid system.

Claims

1. A method for operating a hybrid electric vehicle having an electric machine and at least one energy storage module using a hybrid control module, comprising:

establishing a predetermined service life target for a selected metric of the energy storage module;

establishing a maximum operating value associated with a first usage parameter for the energy storage module;

operating the electric machine such that the actual operating value of the energy storage module for the first usage parameter does not exceed the defined maximum operating value;

calculating a first indicator of the progress of the past operation of the energy storage module toward the predetermined service life target, wherein the first indicator is calculated using a plurality of actual observed usage parameters;

modifying the maximum operating value for the energy storage module based upon the first indicator; and

operating the electric machine such that the actual operating value of the energy storage module for the first usage parameter does not exceed the modified maximum operating value.

3. The method of claim 1, wherein the selected metric is total service time of the energy storage module.

4. The method of claim 1, wherein the selected metric is accumulated vehicle distance traveled.

5. The method of claim 1, wherein the selected metric is total current over time.

6. The method of claim 1, wherein the selected metric is total ampere-hours expended.

9. The method of claim 1, wherein the plurality of actual operating parameters includes the temperature of the energy storage module.

10. The method of claim 1, wherein the plurality of actual operating parameters includes the offset from the ideal state of charge of the energy storage module.

11. The method of claim 1, wherein the plurality of actual operating parameters includes the short term average current level of the energy storage module.

12. The method of claim 1, wherein the plurality of actual operating parameters includes the direction energy flow experienced by the energy storage module.

17. A hybrid control module for performing the steps of claim 1.

19. The method of claim 1, wherein the first usage parameter is the temperature of the energy storage module.

20. The method of claim 1, wherein the first usage parameter is the offset from the ideal state of charge of the energy storage module.

21. The method of claim 1, wherein the first usage parameter is the short term average current level of the energy storage module.

22. The method of claim 1, wherein the first usage parameter is the direction energy flow experienced by the energy storage module.

23. The method of claim 1, further comprising:

establishing a minimum operating value associated with a first usage parameter for the energy storage module,

operating the electric machine such that the actual operating value of the energy storage module for the first usage parameter exceeds the defined minimum operating value;

modifying the minimum operating value for the energy storage module based upon the first indicator; and

operating the electric machine such that the actual operating value of the energy storage module for the first usage parameter exceeds the modified minimum operating value.

24. The method of claim 23, wherein the minimum operating value, maximum operating value, and actual operative value are measures of current.

25. The method of claim 23, wherein the minimum operating value, maximum operating value, and actual operative value are measures of temperature.

2. A method for operating a hybrid electric vehicle having an electric machine and at least one energy storage module using a hybrid control module, comprising:

establishing a predetermined service life target for a selected metric of the energy storage module;

establishing a maximum operating temperature for the energy storage module;

operating the electric machine such that the actual operating temperature of the energy storage module does not exceed the defined maximum operating temperature;

calculating a first indicator of the progress of the past operation of the energy storage module toward the predetermined service life target, wherein the first indicator is calculated using a plurality of actual observed usage parameters;

modifying the maximum operating temperature for the energy storage module based upon the first indicator; and

operating the electric machine such that the actual operating temperature of the energy storage module does not exceed the modified maximum operating temperature.

13. The method of claim 2, wherein a static maximum operating temperature is defined such that the maximum operating temperature may not be modified to exceed said static maximum operating temperature.

14. The method of claim 2, wherein a static minimum operating temperature is defined such that the maximum operating temperature may not be modified to exceed said static minimum operating temperature.

16. The method of claim 2, wherein a maximum temperature adjustment value for a specified period is provided such that the operating temperature may not be modified by an amount greater than said value during said period.

7. A method for operating a hybrid electric vehicle having an electric machine and at least one energy storage module using a hybrid control module, comprising:

establishing a predetermined service life target in ampere-hours for the energy storage module;

establishing a maximum operating temperature for the energy storage module;

operating the electric machine such that the actual operating temperature of the energy storage module does not exceed the defined maximum operating temperature;

integrating the adjusted ampere-hours expended by the energy storage module during a defined period, wherein the adjusted ampere-hours are calculated as a function of the actual ampere-hours expended during the period and a plurality of actual usage parameters observed during the period;

modifying the maximum operating temperature for the energy storage module based upon a comparison of the adjusted ampere-hours expended and the predetermined service life target; and

operating the electric machine such that the actual operating temperature of the energy storage module does not exceed the modified maximum operating temperature.

8. (canceled)

15. (canceled)

18. (canceled)