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

• US 8,852,051 B2
• Filed: 09/26/2012
• Issued: 10/07/2014
• 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:
  US13/627,469
• Publication Number:
  US 20130184912A1
• Time in Patent Office: 741 Days
• Field of Search: None
• US Class Current: 477/3
• 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 an electrical torque provider. The method further includes determining a machine power demand and, in response to the machine power demand, determining a power division description. The method includes operating the internal combustion engine and the electrical torque provider in response to the power division description. The method further includes operating the internal combustion engine by starting the internal combustion engine in response to determining that a battery state-of-charge is below a predetermined threshold value.

Claims

1. A method, comprising:

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

determining a machine power demand;

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

in response to the power division description, operating the internal combustion engine and the at least one electrical torque provider; and

wherein operating the internal combustion engine further comprises starting the internal combustion engine a battery state-of-charge (SOC) is below a predetermined threshold value; and

performing engine shutdown and engine startup operations with at least one time based hysteresis value.

2. The method of claim 1, further comprising determining the at least one time based hysteresis value for the engine shutdown operation in response to a turbocharger temperature.

3. The method of claim 1, further comprising determining a turbocharger temperature value, and preventing the engine shutdown operation in response to the turbocharger temperature value exceeding a threshold.

4. The method of claim 1, further comprising determining that the engine shutdown operation is one of requested and imminent, the method further comprising performing an engine-based turbocharger cooldown operation in response to the requested or imminent engine shutdown operation.

5. The method of claim 1, wherein the operating the internal combustion engine further comprises starting the internal combustion engine when the battery state-of-charge (SOC) is below the predetermined threshold value and the machine power demand is above a first threshold.

6. The method of claim 1, further comprising determining an engine start capability index of the at least one electrical torque provider, and wherein operating the internal combustion engine further comprises starting the internal combustion engine when the engine start capability index is below a first threshold.

7. The method of claim 6, wherein the operating the internal combustion engine further comprises starting the internal combustion engine when the engine start capability index is about to fall below a second threshold.

8. The method of claim 1, further comprising allowing the internal combustion engine shutdown operation in response to the hybrid power train operating in a series mode.

9. The method of claim 1, further comprising preventing the internal combustion engine shutdown operation in response to the internal combustion engine operating in one of a thermal management mode and a warm-up mode.

10. A method, comprising:

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

determining a machine power demand;

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

in response to the power division description, operating the internal combustion engine and the at least one electrical torque provider; and

wherein operating the internal combustion engine further comprises starting the internal combustion engine when a battery state-of-charge (SOC) is

below a first predetermined threshold value; and

determining a turbocharger temperature value, and preventing an engine shutdown operation in response to the turbocharger temperature value exceeding a threshold.

11. The method of claim 10, wherein operating the internal combustion engine further comprises starting the internal combustion engine when a power demand of the at least one electrical torque provider is about to exceed an electrical limit.

12. The method of claim 10, wherein operating the internal combustion engine further comprises starting the internal combustion engine when a battery throughput limit is about to be exceeded.

13. The method of claim 10, wherein operating the internal combustion engine further comprises starting the internal combustion engine when a battery throughput value exceeds a battery throughput threshold and the battery throughput value is moving higher at a throughput increase rate exceeding a throughput increase threshold.

14. The method of claim 10, wherein operating the internal combustion engine further comprises starting the internal combustion engine when a power demand rate of increase exceeds a limit.

15. A method, comprising:

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

determining a machine power demand;

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

in response to the power division description, operating the internal combustion engine and the at least one electrical torque provider;

wherein operating the internal combustion engine further comprises starting the internal combustion engine when;

a battery state-of-charge (SOC) is below a predetermined threshold value; and

determining that an engine shutdown operation is one of requested and imminent, the method further comprising performing an engine-based turbocharger cooldown operation in response to the requested or imminent engine shutdown operation.

16. The method of claim 15, further comprising determining an engine start capability index of the at least one electrical torque provider, and wherein operating the internal combustion engine further comprises starting the internal combustion engine when the engine start capability index is below a start capability threshold of the at least one electrical torque provider.

17. The method of claim 16, wherein the operating the internal combustion engine further comprises starting the internal combustion engine in response to determining that the engine start capability index is about to fall below a second start capability threshold.

18. The method of claim 15, further comprising performing engine shutdown and engine startup operations with at least one time based hysteresis value.

19. The method of claim 18, further comprising determining the at least one time based hysteresis value for the engine shutdown operation in response to a turbocharger temperature value.

20. The method of claim 15, wherein operating the internal combustion engine further comprises starting the internal combustion engine the machine power demand exceeds an engine start threshold value and the machine power demand is increasing.