METHOD AND CONTROL ARCHITECTURE FOR OPTIMIZATION OF ENGINE FUEL-CUTOFF SELECTION AND ENGINE INPUT TORQUE FOR A HYBRID POWERTRAIN SYSTEM

• US 20090070019A1
• Filed: 09/11/2007
• Published: 03/12/2009
• Est. Priority Date: 09/11/2007
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Heap, Anthony H.
• Granted Patent: US 8,265,813 B2
• Time in Patent Office: Days
• US Class Current: 701/112
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60L 2240/445 Temperature
• CPC Class Codes: B60L 2240/486 Operating parameters
• 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 10/115 with planetary gears
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• 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 2050/0006 Digital architecture hierarchy
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/0657 Engine torque
• CPC Class Codes: B60W 2510/0671 Engine manifold pressure
• CPC Class Codes: B60W 2510/0676 Engine temperature
• CPC Class Codes: B60W 2510/081 Speed
• CPC Class Codes: B60W 2510/104 : Output speed
• CPC Class Codes: B60W 2510/244 : Charge state
• CPC Class Codes: B60W 2540/10 : Accelerator pedal position
• CPC Class Codes: B60W 2540/12 : Brake pedal position
• CPC Class Codes: B60W 2555/20 : Ambient conditions, e.g. wind or rain
• CPC Class Codes: B60W 2710/0666 : Engine torque
• CPC Class Codes: B60W 2710/083 : Torque
• CPC Class Codes: F02D 41/0087 : Selective cylinder activation, i.e. partial cylinder operation deceleration cut-off F02D41/123
• CPC Class Codes: F02D 41/1406 : with use of a optimisation method, e.g. iteration
• CPC Class Codes: F02N 11/0818 : Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/84 : Data processing systems or methods, management, administration

Abstract

There is provided a method and article of manufacture for operating an internal combustion engine adapted to transmit torque to a hybrid transmission. The method comprises determining an engine input torque transmittable to the hybrid transmission for a plurality of engine states, the engine states comprising a fueled-engine operation and an engine fuel-cutoff operation. Costs are determined costs for operating the engine and hybrid transmission in the engine states to substantially meet an operator torque request. The engine state is controlled to one of the fueled-engine operation and the engine fuel-cutoff operation based upon the costs.

Claims

1. Method for operating an internal combustion engine adapted to transmit torque to a hybrid transmission, comprising:

determining engine input torque transmittable to the hybrid transmission for a plurality of engine states the engine states comprising a fueled-engine operation and an engine fuel-cutoff operation;

determining costs for operating the engine and hybrid transmission in the engine states to substantially meet an operator torque request; and

,

controlling the engine state to one of the fueled-engine operation and the engine fuel-cutoff operation based upon the costs.

2. The method of claim 1, further comprising determining the engine input torque transmittable to the hybrid transmission for a normal engine state and an engine fuel-cutoff state.

3. The method of claim 2, wherein determining costs for operating the engine and hybrid transmission in the engine states to substantially meet the operator torque request comprises determining a minimum powertrain system operating cost and an associated engine input torque to substantially meet the operator torque request at the minimum powertrain system operating cost for each of the normal engine state and the engine fuel-cutoff state.

4. The method of claim 3, wherein determining the minimum powertrain system operating cost and the associated engine input torque for the normal engine state comprises executing a one-dimensional search over a range of engine input torques.

5. The method of claim 4, wherein the one-dimensional search comprises iteratively selecting parametric values for the engine input torque over the range of engine input torques, and, executing a system equation and a cost function for each of the iteratively selected parametric values for engine input torque.

6. The method of claim 3, comprising executing a system equation and a cost function for an engine fuel-cutoff engine input torque to determine powertrain system operating cost.

7. The method of claim 3, further comprising controlling the engine state to one of the normal state and the engine fuel-cutoff state based upon the preferred costs.

8. The method of claim 1, further comprising determining the engine input torque transmittable to the hybrid transmission for a cylinder deactivation state and for a cylinder-deactivation engine fuel-cutoff state.

9. The method of claim 8, wherein determining costs for operating the engine and hybrid transmission in the engine states to substantially meet the operator torque request comprises determining a minimum powertrain system operating cost and an associated engine input torque to substantially meet the operator torque request at the minimum powertrain system operating cost for each of the cylinder deactivation state and for the cylinder-deactivation state at engine fuel-cutoff.

10. The method of claim 9, wherein determining the minimum powertrain system operating cost and the associated engine input torque for the cylinder-deactivation engine operation comprises executing a one-dimensional search over a range of engine input torques.

11. The method of claim 10, wherein the one-dimensional search comprises iteratively selecting parametric values for the engine input torque over the range of engine input torques, and, executing a system equation and a cost function for each of the iteratively selected parametric values for engine input torque.

12. The method of claim 9, comprising executing a system equation and a cost function for a cylinder-deactivation and fuel-cutoff engine input torque to determine powertrain system operating cost.

13. The method of claim 9, further comprising controlling the engine state to one of the cylinder deactivation operation and the cylinder deactivation and engine fuel-cutoff operation based upon the preferred costs.

14. The method of claim 1, wherein the engine input torque transmittable to the hybrid transmission for each of the engine states is determinable based upon the operator torque request, engine operating conditions, and engine operating constraints.

15. The method of claim 1, further comprising determining engine input torque transmittable to the hybrid transmission for each of a plurality of engine states based upon a current operating range of the hybrid transmission.

16. The method of claim 15, wherein the current operating range of the hybrid transmission comprises one of a plurality of fixed gear modes and two continuously variable modes.

17. Method for operating a hybrid powertrain, the hybrid powertrain comprising an internal combustion engine, an energy storage system, an electric machine, and an electro-mechanical transmission, the energy storage system and electric machine electrically-operatively coupled for power flow therebetween;

and, the engine, electric machine, and the electro-mechanical transmission mechanically-operatively coupled to transmit power therebetween to transmit torque to an output, the method comprising;

determining allowable engine states and an operator torque request;

determining engine input torque transmittable to the electro-mechanical transmission for engine states comprising an engine-fueled operation and an engine fuel-cutoff operation;

determining costs for operating the engine and the electro-mechanical transmission in the engine states to substantially meet an operator torque request; and

,

controlling the engine state to one of the engine-fueled operation and an engine fuel-cutoff operation based upon the costs.

18. The method of claim 17, wherein the engine input torque for each engine state is determined based upon an engine input speed to the transmission, a transmission output speed, a current operating range state of the transmission, an operator torque request, and available power from an electrical storage device operatively connected to the electrical machine.

19. The method of claim 17, wherein determining costs for operating the engine and the electro-mechanical transmission in the engine states to substantially meet the operator torque request comprises determining a minimum powertrain system operating cost and an associated engine input torque to substantially meet the operator torque request at the minimum powertrain system operating cost for each of the engine-fueled operation and an engine fuel-cutoff operation.

20. The method of claim 19, wherein determining the minimum powertrain system operating cost and the associated engine input torque comprises executing a one-dimensional search whereby parametric values for engine input torque are iteratively selected over the range of engine input torques and a system equation and a cost function are executed for each of the iteratively selected parametric values for engine input torque.