System and method for controlling a variable valve actuation system to reduce delay associated with reactivating a cylinder

Patent metadata

Field	Value
Publication number	US-9567928-B2
Application number	US-201213568690-A
Country	US
Kind code	B2
Filing date	Aug 7, 2012
Priority date	Aug 7, 2012
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

A system according to the principles of the present disclosure includes a cylinder control module and a valve control module. The cylinder control module deactivates and reactivates a cylinder of an engine based on a driver torque request while an ignition system associated with the engine is in an on position. The valve control module selectively adjusts a period for which at least one of an intake valve and an exhaust valve of the cylinder are opened based on a first time when the cylinder is reactivated.

First claim

What is claimed is:

1. A system comprising:
a cylinder control module that deactivates and reactivates a cylinder of an engine based on a driver torque request while an ignition system associated with the engine is in an on position; and
a valve control module that selectively adjusts a duration of a period for which at least one of an intake valve and an exhaust valve of the cylinder are opened based on a first time corresponding to a crank angle of the engine when the cylinder is reactivated relative to top dead center.

2. The system of claim 1 , wherein the valve control module opens the exhaust valve at a second time that is based on the first time.

3. The system of claim 2 , wherein the valve control module opens the exhaust valve when the cylinder is reactivated if the crank angle is greater than a first predetermined angle.

4. The system of claim 3 , wherein the valve control module adjusts a third time when the intake valve is opened based on the second time.

5. The system of claim 3 , wherein the valve control module opens the exhaust valve for a first period when the crank angle is greater than or equal to a second predetermined angle and opens the exhaust valve for a second period that is different from the first period when the crank angle is less than the second predetermined angle.

6. The system of claim 1 , wherein the valve control module adjusts the period when the driver torque request is greater than a predetermined torque.

7. A method comprising:
deactivating and reactivating a cylinder of an engine based on a driver torque request while an ignition system associated with the engine is in an on position; and
selectively adjusting a duration of a period for which at least one of an intake valve and an exhaust valve of the cylinder are opened based on a first time corresponding to a crank angle of the engine when the cylinder is reactivated relative to top dead center.

8. The method of claim 7 , further comprising adjusting the period when the driver torque request is greater than a predetermined torque.

9. The method of claim 7 , further comprising opening the exhaust valve at a second time that is based on the first time.

10. The method of claim 9 , further comprising opening the exhaust valve when the cylinder is reactivated if the crank angle is greater than a first predetermined angle.

11. The method of claim 10 , further comprising adjusting a third time when the intake valve is opened based on the second time.

12. The method of claim 10 , further comprising:
opening the exhaust valve for a first period when the crank angle is greater than or equal to a second predetermined angle; and
opening the exhaust valve for a second period that is different from the first period when the crank angle is less than the second predetermined angle.

13. The system of claim 3 wherein the second time at which the valve control module opens the exhaust valve is later than the first time when the crank angle is less than or equal to the first predetermined angle.

14. The system of claim 13 wherein:
the cylinder control module reactivates the cylinder during a first piston stroke; and
the valve control module opens the exhaust valve during a second piston stroke that occurs after the first piston stroke when the crank angle is less than or equal to the first predetermined angle, wherein the first and second piston strokes are consecutive piston strokes.

15. The system of claim 13 further comprising a firing order module that advances spark timing in the cylinder when the crank angle is less than or equal to the first predetermined angle, wherein the valve control module adjusts the second time at which the exhaust valve is opened based on the advanced spark timing.

16. The method of claim 10 wherein the second time at which the exhaust valve is opened is later than the first time when the crank angle is less than or equal to the first predetermined angle.

17. The method of claim 16 further comprising:
reactivating the cylinder during a first piston stroke; and
opening the exhaust valve during a second piston stroke that occurs after the first piston stroke when the crank angle is less than or equal to the first predetermined angle, wherein the first and second piston strokes are consecutive piston strokes.

18. The method of claim 16 further comprising:
advancing spark timing in the cylinder when the crank angle is less than or equal to the first predetermined angle; and
adjusting the second time at which the exhaust valve is opened based on the advanced spark timing.

19. A system, comprising:
a cylinder control module that deactivates and reactivates a cylinder of an engine based on a driver torque request while an ignition system associated with the engine is in an on position; and
a valve control module that selectively adjusts at least one of:
a time at which at least one of an intake valve and an exhaust valve of the cylinder are opened based on a crank angle of the engine when the cylinder is reactivated relative to top dead center; and
a duration for which at least one of the intake valve and the exhaust valve are opened based on the crank angle of the engine when the cylinder is reactivated relative to top dead center.

20. The system of claim 19 , wherein the valve control module adjusts both the opening time and the opening duration of at least one of the intake valve and the exhaust valve when the crank angle is less than a first angle.

21. A method, comprising:
deactivating and reactivating a cylinder of an engine based on a driver torque request while an ignition system associated with the engine is in an on position; and
selectively adjusting at least one of:
a time at which at least one of an intake valve and an exhaust valve of the cylinder are opened based on a crank angle of the engine when the cylinder is reactivated relative to top dead center; and
a duration for which at least one of the intake valve and the exhaust valve are opened based on the crank angle of the engine when the cylinder is reactivated relative to top dead center.

22. The method of claim 21 , further comprising adjusting both the opening time and the opening duration of at least one of the intake valve and the exhaust valve when the crank angle is less than a first angle.

Assignees

• Rayl Allen B
• Brennan Daniel G
• Gm Global Tech Operations Llc

Inventors

• Rayl Allen B
• Brennan Daniel G

Classifications

• F02D41/0087 Primary

  Selective cylinder activation, i.e. partial cylinder operation (deceleration cut-off F02D41/123) · CPC title

• Y02T10/18

  Cross-Sectional Technologies · mapped topic

• F02D2041/001

  for engines with variable valve actuation · CPC title

• F02P5/1504

  with particular means during a transient phase, e.g. acceleration, deceleration, gear change (during starting F02P5/1506) · CPC title

• F02P9/00

  Electric spark ignition control, not otherwise provided for · CPC title