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

• US 8,888,652 B2
• Filed: 09/26/2012
• Issued: 11/18/2014
• 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:
  US13/627,572
• Publication Number:
  US 20130184913A1
• Time in Patent Office: 783 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 and at least one electrical torque provider. The method further includes determining a machine power demand for the hybrid power train, and determining a power division between the internal combustion engine and the electrical torque provider in response to the machine power demand. The method further includes determining a state-of-charge (SOC) of an electrical energy storage device electrically coupled to the at least one electrical torque provider and interpreting a target SOC for the electrical energy storage device in response to a vehicle speed, and determining an SOC deviation for the electrical storage device, wherein the SOC deviation comprises a function of a difference between the SOC of the electrical energy storage device and the target SOC of the electrical energy storage device.

Claims

1. A method, comprising:

operating a hybrid power train having an internal combustion engine and at least one electrical torque provider;

determining a machine power demand for the hybrid power train;

determining a power division between the internal combustion engine and the electrical torque provider in response to the machine power demand;

determining a state-of-charge (SOC) of an electrical energy storage device electrically coupled to the at least one electrical torque provider;

interpreting a target SOC for the electrical energy storage device in response to a vehicle speed;

decreasing the target SOC in response to an increasing vehicle speed;

determining an SOC deviation for the electrical storage device, wherein the SOC deviation comprises a function of a difference between the SOC of the electrical energy storage device and the target SOC of the electrical energy storage device; and

adjusting the power division in response to the SOC deviation.

2. The method of claim 1, wherein the determining the power division and the adjusting the power division comprise operating a cost comparison algorithm between achieving the machine power demand with the internal combustion engine and the at least one electrical energy storage device.

3. The method of claim 2, further comprising increasing a cost of the SOC deviation in response to a decreased state-of-health of the electrical energy storage device.

4. The method of claim 2, further comprising determining the state-of-health of the electrical energy storage device in response to at least one parameter selected from the parameters consisting of:

a throughput event of the electrical energy storage device, a SOC event of the electrical energy storage device, a regeneration cycle event of the electrical energy storage device, and an age of the electrical energy storage device.

5. The method of claim 1, further comprising determining the SOC deviation as a function of at least one parameter selected from the parameters consisting of:

a vehicle mass, an electrical energy storage device capacity, an electrical energy storage device power limit, a torque capacity of the at least one electrical torque provider, a power capacity of the at least one electrical torque provider, and detected operator braking behavior.

6. A method comprising:

operating a hybrid power train having an internal combustion engine and at least one electrical torque provider;

determining a machine power demand for the hybrid power train;

determining a power division between the internal combustion engine and the electrical torque provider in response to the machine power demand;

determining a state-of-charge (SOC) of an electrical energy storage device electrically coupled to the at least one electrical torque provider;

interpreting a target SOC for the electrical energy storage device in response to a vehicle speed;

adjusting the target SOC in response to a temperature of the electrical energy storage device;

determining an SOC deviation for the electrical storage device, wherein the SOC deviation comprises a function of a difference between the SOC of the electrical energy storage device and the target SOC of the electrical energy storage device; and

adjusting the power division in response to the SOC deviation.

7. The method of claim 6, further comprising decreasing the target SOC in response to a decreasing temperature of the electrical energy storage device.

8. A method, comprising:

operating a hybrid power train having an internal combustion engine and at least one electrical torque provider;

determining a machine power demand for the hybrid power train;

determining a power division between the internal combustion engine and the electrical torque provider in response to the machine power demand;

determining a state-of-charge (SOC) of an electrical energy storage device electrically coupled to the at least one electrical torque provider;

interpreting a target SOC for the electrical energy storage device in response to a vehicle speed;

determining an SOC deviation for the electrical storage device, wherein the SOC deviation comprises a function of a difference between the SOC of the electrical energy storage device and the target SOC of the electrical energy storage device;

adjusting one of the target SOC and the SOC deviation in response to a state-of-health of the electrical storage device; and

adjusting the power division in response to the SOC deviation.

9. The method of claim 8, further comprising increasing the SOC deviation in response to a degraded state-of-health of the electrical storage device.

10. A method, comprising:

operating a hybrid power train having an internal combustion engine and at least one electrical torque provider;

determining a machine power demand for the hybrid power train;

determining a power division between the internal combustion engine and the electrical torque provider in response to the machine power demand;

determining a state-of-charge (SOC) of an electrical energy storage device electrically coupled to the at least one electrical torque provider;

interpreting a target SOC for the electrical energy storage device in response to a vehicle speed;

adjusting the target SOC of the electrical energy storage device in response to the state-of-health of the electrical energy storage device;

determining an SOC deviation for the electrical storage device, wherein the SOC deviation comprises a function of a difference between the SOC of the electrical energy storage device and the target SOC of the electrical energy storage device; and

adjusting the power division in response to the SOC deviation.

11. A method, comprising:

operating a hybrid power train having an internal combustion engine and at least one electrical torque provider;

determining a state-of-charge (SOC) of an electrical energy storage device electrically coupled to the at least one electrical torque provider;

interpreting a target SOC for the electrical energy storage device in response to a vehicle speed;

increasing the target SOC in response to a reduced vehicle speed;

determining an SOC deviation for the electrical storage device, wherein the SOC deviation comprises a function of a difference between the SOC of the electrical energy storage device and the target SOC of the electrical energy storage device; and

adjusting operations of the hybrid power train in response to the SOC deviation.

12. The method of claim 11, further comprising determining a recoverable kinetic energy of the vehicle in response to the vehicle speed, and wherein the interpreting the SOC target is in response to the recoverable kinetic energy.

13. The method of claim 11, further comprising determining a machine power demand for the hybrid power train, determining a power division between the internal combustion engine and the electrical torque provider in response to the machine power demand, and wherein the adjusting operations of the hybrid power train comprise adjusting the power division between the internal combustion engine and the electrical torque provider.

14. A method, comprising:

operating a hybrid power train having an internal combustion engine and at least one electrical torque provider;

determining a state-of-charge (SOC) of an electrical energy storage device electrically coupled to the at least one electrical torque provider;

interpreting a target SOC for the electrical energy storage device in response to a vehicle speed;

reducing the target SOC in response to an increased vehicle speed;

determining an SOC deviation for the electrical storage device, wherein the SOC deviation comprises a function of a difference between the SOC of the electrical energy storage device and the target SOC of the electrical energy storage device; and

adjusting operations of the hybrid power train in response to the SOC deviation.

15. A method, comprising:

operating a hybrid power train having an internal combustion engine and at least one electrical torque provider;

determining a machine shaft torque demand and a machine shaft speed;

in response to the machine shaft torque demand and the machine shaft speed, determining a machine power demand;

in response to determining the machine shaft speed is zero and the machine shaft torque demand is greater than zero, adjusting the machine power demand to a non-zero value;

determining a power division between the internal combustion engine and the electrical torque provider in response to the machine power demand;

determining a state-of-charge (SOC) of an electrical energy storage device electrically coupled to the at least one electrical torque provider;

interpreting a target SOC for the electrical energy storage device in response to a vehicle speed;

determining an SOC deviation for the electrical storage device, wherein the SOC deviation comprises a function of a difference between the SOC of the electrical energy storage device and the target SOC of the electrical energy storage device; and

adjusting the power division in response to the SOC deviation.

16. The method of claim 15, further comprising decreasing the target SOC in response to an increasing vehicle speed.

17. The method of claim 15, wherein the determining the power division and the adjusting the power division comprise operating a cost comparison algorithm between achieving the machine power demand with the internal combustion engine and the at least one electrical energy storage device.

18. The method of claim 17, further comprising increasing a cost of the SOC deviation in response to a decreased state-of-health of the electrical energy storage device.