System, method, and apparatus for controlling power output distribution in a hybrid power train

• US 8,834,318 B2
• Filed: 09/25/2012
• Issued: 09/16/2014
• Est. Priority Date: 01/13/2011
• Status: Active Grant

• Current Assignee: Cummins Incorporated
• Original Assignee: Cummins Incorporated
• Inventors: Sujan, Vivek Anand, Books, Martin T., Djan-Sampson, Patrick O., Muralidhar, Praveen
• Primary Examiner(s): Bishop, Erin D
• Application Number:
  US13/626,471
• Publication Number:
  US 20130184910A1
• Time in Patent Office: 721 Days
• Field of Search: None
• US Class Current: 477/5
• CPC Class Codes: B60K 6/387 Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means
• CPC Class Codes: B60K 6/442 Series-parallel switching type
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• 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 20/10 Controlling the power contribution of each of the prime movers to meet required power demand
• CPC Class Codes: B60W 20/14 in conjunction with braking regeneration
• CPC Class Codes: B60W 20/20 Control strategies involving selection of hybrid configuration, e.g. selection between series or parallel configuration
• CPC Class Codes: B60W 20/40 Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers power-up or power-down of the driveline B60W30/192
• CPC Class Codes: B60W 2050/0008 Feedback, closed loop systems or details of feedback error signal
• CPC Class Codes: B60W 2050/001 Proportional integral [PI] controller
• CPC Class Codes: B60W 2050/0056 Low-pass filters
• CPC Class Codes: B60W 2510/0633 Turbocharger state
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/0657 Engine torque
• CPC Class Codes: B60W 2510/068 Engine exhaust temperature
• CPC Class Codes: B60W 2510/081 Speed
• CPC Class Codes: B60W 2510/083 Torque
• CPC Class Codes: B60W 2510/1005 Transmission ratio engaged
• CPC Class Codes: B60W 2510/244 : Charge state
• CPC Class Codes: B60W 2510/246 : Temperature
• CPC Class Codes: B60W 2510/248 : Age of storage means
• CPC Class Codes: B60W 2510/305 : Power absorbed by auxiliaries
• CPC Class Codes: B60W 2520/10 : Longitudinal speed
• CPC Class Codes: B60W 2530/00 : Input parameters relating to vehicle conditions or values, not covered by groups B60W2510/00 or B60W2520/00
• CPC Class Codes: B60W 2530/10 : Weight
• CPC Class Codes: B60W 2540/12 : Brake pedal position
• CPC Class Codes: B60W 2710/021 : Clutch engagement state
• CPC Class Codes: B60W 2710/0677 : Engine power
• CPC Class Codes: B60W 2710/086 : Power
• CPC Class Codes: B60W 2710/244 : Charge state
• CPC Class Codes: B60W 2710/248 : Current for loading or unloading
• CPC Class Codes: B60W 30/18127 : Regenerative braking
• CPC Class Codes: B60W 30/18136 : Engine braking
• CPC Class Codes: B60W 30/188 : Controlling power parameters of the driveline, e.g. determining the required power
• CPC Class Codes: B60W 30/1882 : characterised by the working point of the engine, e.g. by using engine output chart
• CPC Class Codes: B60W 30/192 : Mitigating problems related to power-up or power-down of the driveline, e.g. start-up of a cold engine
• CPC Class Codes: Y02T 10/40 : Engine management systems
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/84 : Data processing systems or methods, management, administration
• CPC Class Codes: Y10S 903/93 : Conjoint control of different elements

Abstract

A method includes operating a hybrid power train having an internal combustion engine, at least one electrical torque provider, and an electrical energy storage device electrically coupled to the electrical torque provider(s). The method further includes determining a machine power demand, and determining a power division description in response to the machine power demand. The method further includes interpreting a state-of-health (SOH) for the electrical energy storage device, and in response to the SOH for the electrical energy storage device, adjusting the power division description.

Claims

1. A method, comprising:

operating a hybrid power train, wherein the hybrid power train includes an internal combustion engine, at least one electrical torque provider, and an electrical energy storage device electrically coupled to the at least one electrical torque provider;

determining a machine power demand;

in response to the machine power demand, determining a power division description;

interpreting a state-of-health (SOH) for the electrical energy storage device; and

in response to the SOH for the electrical energy storage device, adjusting the power division description.

2. The method of claim 1, further comprising, determining a state-of-charge (SOC) target for the electrical energy storage device in response to the SOH for the electrical energy storage device;

and

further adjusting the power division description in response to the SOC target for the electrical energy storage device.

3. The method of claim 2, further comprising determining the SOC target in response to a charging energy efficiency for the electrical energy storage device.

4. The method of claim 2, further comprising determining the SOC target in response to a charge-discharge energy cycle efficiency for the electrical energy storage device.

5. The method of claim 1, further comprising determining a discharge rate limit for the electrical energy storage device, and further adjusting the power division description in response to the discharge rate limit.

6. The method of claim 5, further comprising determining the discharge rate limit in response to at least one parameter selected from the parameters consisting of the SOH of the electrical energy storage device, a power bus deliverability value, a motor limit for one of the electrical torque providers, and an accessory load value.

7. The method of claim 5, further comprising determining the discharge rate limit in response to at least one power electronics throughput limit, wherein the power electronics is positioned between the electrical energy storage device and the at least one electrical torque provider.

8. The method of claim 1, further comprising determining a charge rate limit for the electrical energy storage device, and further adjusting the power division description in response to the charge rate limit.

9. The method of claim 8, further comprising determining the charge rate limit in response to at least one parameter selected from the parameters consisting of the SOH of the electrical energy storage device, a power bus deliverability value, a motor limit for one of the electrical torque providers, and an accessory load value.

10. The method of claim 8, further comprising determining the charge rate limit in response to at least one power electronics throughput limit, wherein the power electronics is positioned between the electrical energy storage device and the at least one electrical torque provider.

11. A method, comprising:

operating a hybrid power train, wherein the hybrid power train includes an internal combustion engine, at least one electrical torque provider, and an electrical energy storage device electrically coupled to the at least one electrical torque provider;

determining a machine power demand;

in response to the machine power demand, determining a power division description;

interpreting a state-of-health (SOH) for the electrical energy storage device, a state-of-charge (SOC) for the electrical energy storage device, and a target SOC for the electrical energy storage device;

determining an SOC deviation for the electrical energy device in response to the SOC for the electrical energy storage device the target SOC for the electrical energy storage device; and

in response to the SOH for the electrical energy storage device and the SOC deviation for the electrical energy storage device, adjusting the power division description.

12. The method of claim 11, further comprising selecting one of a plurality of SOC deviation response curves in response to the SOH for the electrical energy storage device.

13. The method of claim 12, wherein the plurality of SOC deviation response curves provide an increasing SOC deviation response in response to a decreasing SOH for the electrical energy storage device.

14. The method of claim 11, further comprising interpreting the target SOC for the electrical energy storage device in response to the SOH for the electrical energy storage device.

15. The method of claim 14, further comprising increasing the target SOC for the electrical energy storage device in response to a decreasing SOH for the electrical energy storage device.

16. The method of claim 11, further comprising interpreting the target SOC for the electrical energy storage device in response to a vehicle speed value.

17. The method of claim 16, further comprising reducing the target SOC for the electrical energy storage device in response to an increasing vehicle speed value.

18. A method, comprising:

determining a machine power demand for a hybrid power train, wherein the hybrid power train includes an internal combustion engine, at least one electrical torque provider, and an electrical energy storage device electrically coupled to the at least one electrical torque provider;

interpreting a state-of-health (SOH) for the electrical energy storage device; and

providing a power division description in response to the SOH for the electrical energy storage device and the machine power demand.

19. The method of claim 18, further comprising, determining a state-of-charge (SOC) target for the electrical energy storage device in response to the SOH for the electrical energy storage device;

and

adjusting the power division description in response to the SOC target for the electrical energy storage device.

20. The method of claim 19, further comprising determining the SOC target in response to a charging energy efficiency for the electrical energy storage device.

21. The method of claim 19, further comprising determining the SOC target in response to a charge-discharge energy cycle efficiency for the electrical energy storage device.

22. The method of claim 18, further comprising determining a discharge rate limit for the electrical energy storage device, and adjusting the power division description in response to the discharge rate limit.

23. The method of claim 22, further comprising determining the discharge rate limit in response to at least one parameter selected from the parameters consisting of the SOH of the electrical energy storage device, a power bus deliverability value, a motor limit for one of the electrical torque providers, and an accessory load value.

24. The method of claim 22, further comprising determining the discharge rate limit in response to at least one power electronics throughput limit, wherein the power electronics is positioned between the electrical energy storage device and the at least one electrical torque provider.

25. The method of claim 18, further comprising determining a charge rate limit for the electrical energy storage device, and further adjusting the power division description in response to the charge rate limit.

26. The method of claim 25, further comprising determining the charge rate limit in response to at least one parameter selected from the parameters consisting of the SOH of the electrical energy storage device, a power bus deliverability value, a motor limit for one of the electrical torque providers, and an accessory load value.

27. The method of claim 25, further comprising determining the charge rate limit in response to at least one power electronics throughput limit, wherein the power electronics is positioned between the electrical energy storage device and the at least one electrical torque provider.