OXYGEN FLOW REDUCTION DURING ENGINE START/STOP OPERATION

• US 20100212629A1
• Filed: 02/25/2009
• Published: 08/26/2010
• Est. Priority Date: 02/25/2009
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Inventors: Albertson, William C., Mc Donald, Mike M.
• Granted Patent: US 8,326,519 B2
• Time in Patent Office: Days
• US Class Current: 123/348
• CPC Class Codes: F01L 1/146 Push-rods
• CPC Class Codes: F01L 13/0005 Deactivating valves
• CPC Class Codes: F01L 2001/2444 Details relating to the hydraulic feeding circuit, e.g. lifter oil manifold assembly [LOMA]
• CPC Class Codes: F01L 2013/001 Deactivating cylinders
• CPC Class Codes: F01L 2800/03 Stopping; Stalling
• CPC Class Codes: F01L 2820/041 Camshafts position or phase sensors
• CPC Class Codes: F02D 13/06 Cutting-out cylinders
• CPC Class Codes: F02D 41/0002 Controlling intake air
• CPC Class Codes: F02D 41/0295 Control according to the amount of oxygen that is stored on the exhaust gas treating apparatus
• CPC Class Codes: F02D 41/042 for stopping the engine
• CPC Class Codes: F02N 11/0818 Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
• CPC Class Codes: F02N 2200/022 Engine speed
• CPC Class Codes: F02N 2200/061 Battery state of charge [SOC]
• CPC Class Codes: F02N 2200/101 Accelerator pedal position
• CPC Class Codes: F02N 2200/102 Brake pedal position
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

An engine control system comprises an intake valve deactivation module and an exhaust valve deactivation module. The intake valve deactivation module deactivates an intake valve of a cylinder of an engine based on an engine stop request such that the intake valve remains closed. The exhaust valve deactivation module deactivates an exhaust valve of the cylinder after the intake valve deactivation module deactivates the intake valve such that the exhaust valve remains closed.

Claims

1. An engine control system, comprising:

an intake valve deactivation module that deactivates an intake valve of a cylinder of an engine based on an engine stop request such that the intake valve remains closed; and

an exhaust valve deactivation module that deactivates an exhaust valve of the cylinder after the intake valve deactivation module deactivates the intake valve such that the exhaust valve remains closed.

2. The engine control system of claim 1, further comprising an engine start-stop module that generates the engine stop request during a start-stop engine mode that includes stopping rotation of an engine.

3. The engine control system of claim 1, wherein the engine stop request is based on at least one of engine speed, a brake pedal position, an accelerator pedal position, and vehicle speed.

4. The engine control system of claim 1, wherein the intake valve deactivation module deactivates the intake valve after the cylinder receives air and fuel.

5. The engine control system of claim 1, wherein the exhaust valve deactivation module deactivates the exhaust valve after exhaust gas is expelled from the cylinder.

6. The engine control system of claim 1, wherein the intake valve deactivation module deactivates the intake valve such that the intake valve remains closed after exhaust gas is expelled from the cylinder.

7. The engine control system of claim 1, wherein the intake valve deactivation module deactivates the intake valve such that the intake valve remains closed while the engine stops rotating.

8. The engine control system of claim 1, wherein the exhaust valve deactivation module deactivates the exhaust valve such that the exhaust valve remains closed while the engine stops rotating.

9. The engine control system of claim 1, further comprising a plurality of cylinders including a plurality of intake valves wherein the intake valve deactivation module deactivates the intake valve of each cylinder based on an engine firing order.

10. The engine control system of claim 1, further comprising a plurality of cylinders including a plurality of exhaust valves wherein the exhaust valve deactivation module deactivates the exhaust valve of each cylinder based on an engine firing order.

11. A method comprising:

deactivating an intake valve of a cylinder of an engine based on an engine stop request such that the intake valve remains closed; and

deactivating an exhaust valve of the cylinder after the intake valve deactivation module deactivates the intake valve such that the exhaust valve remains closed.

12. The method claim 11, further comprising generating the engine stop request during a start-stop engine mode that includes stopping rotation of an engine.

13. The method claim 11, further comprising generating the engine stop request based on at least one of engine speed, a brake pedal position, an accelerator pedal position, and vehicle speed.

14. The method claim 11, further comprising deactivating the intake valve after the cylinder receives air and fuel.

15. The method claim 11, further comprising deactivating the exhaust valve after exhaust gas is expelled from the cylinder.

16. The method claim 11, further comprising deactivating the intake valve such that the intake valve remains closed after exhaust gas is expelled from the cylinder.

17. The method claim 11, further comprising deactivating the intake valve such that the intake valve remains closed while the engine stops rotating.

18. The method claim 11, further comprising deactivating the exhaust valve such that the exhaust valve remains closed while the engine stops rotating.

19. The method claim 11, further comprising deactivating a plurality of intake valves of a plurality of cylinders based on an engine firing order.

20. The method claim 11, further comprising deactivating a plurality of exhaust valves of a plurality of cylinders based on an engine firing order.