Cylinder deactivation pattern matching
View Patent ↗A cylinder control module: selects one of N predetermined cylinder activation/deactivation patterns as a desired cylinder activation/deactivation pattern for cylinders of an engine, wherein N is an integer greater than two; and activates and deactivates opening of intake and exhaust valves of first and second ones of the cylinders that are to be activated based on the desired cylinder activation/deactivation pattern, respectively. A fuel control module provides fuel to the first ones of the cylinders and disables fueling to the second ones of the cylinders. The cylinder control module further: determines M possible ones of the N cylinder activation/deactivation patterns, wherein M is an integer greater than or equal to one; selectively compares the M possible cylinder activation/deactivation patterns with the desired cylinder activation/deactivation pattern; and selectively updates the desired cylinder activation/deactivation pattern to one of the M possible cylinder activation/deactivation patterns.
1. A cylinder control system of a vehicle, comprising:
a cylinder control module that:
selects one of N predetermined cylinder activation/deactivation patterns as a desired cylinder activation/deactivation pattern for cylinders of an engine, wherein N is an integer greater than two, each of the N predetermined cylinder activation/deactivation patterns including P indicators for the next P cylinder events, each of the P indicators indicating whether to activate or deactivate a corresponding cylinder, and P is an integer greater than a total number of cylinders of the engine;
activates opening of intake and exhaust valves of first ones of the cylinders that are to be activated based on the desired cylinder activation/deactivation pattern; and
deactivates opening of intake and exhaust valves of second ones of the cylinders that are to be deactivated based on the desired cylinder activation/deactivation pattern; and
a fuel control module that provides fuel to the first ones of the cylinders and that disables fueling to the second ones of the cylinders,
wherein the cylinder control module further:
determines M possible ones of the N cylinder activation/deactivation patterns, wherein M is an integer greater than or equal to one;
selectively compares portions of the M possible cylinder activation/deactivation patterns, respectively, with a portion of the desired cylinder activation/deactivation pattern; and
selectively updates the desired cylinder activation/deactivation pattern to one of the M possible cylinder activation/deactivation patterns based on the comparisons.
2. The cylinder control system of claim 1 wherein the cylinder control module includes a pattern database that stores the N predetermined cylinder activation/deactivation patterns.
3. The cylinder control system of claim 1 wherein the portion of the desired cylinder activation/deactivation pattern corresponds to the last Q indicators for the last Q events of the desired cylinder activation/deactivation pattern, and
wherein the portions of each of the M possible cylinder activation/deactivation patterns correspond to the first Q indicators of the first Q events of the M possible cylinder activation/deactivation patterns, wherein Q is an integer greater than one and less than or equal to P.
4. The cylinder control system of claim 1 wherein the cylinder control module determines the M possible cylinder activation/deactivation patterns based on engine speed.
5. The cylinder control system of claim 1 wherein the cylinder control module determines the M possible cylinder activation/deactivation patterns based on a requested torque output of the engine.
6. The cylinder control system of claim 1 wherein the cylinder control module determines the M possible cylinder activation/deactivation patterns based on a gear ratio of a transmission.
7. The cylinder control system of claim 1 wherein the cylinder control module determines the M possible cylinder activation/deactivation patterns based on an amount of air per cylinder.
8. The cylinder control system of claim 1 wherein the cylinder control module determines the M possible cylinder activation/deactivation patterns based on an amount of residual exhaust per cylinder.
9. The cylinder control system of claim 1 wherein the cylinder control module determines the M possible cylinder activation/deactivation patterns based on engine speed, a requested torque output of the engine, a gear ratio of a transmission, an amount of air per cylinder, and an amount of residual exhaust per cylinder.
10. A cylinder control method for a vehicle, the method comprising:
selecting one of N predetermined cylinder activation/deactivation patterns as a desired cylinder activation/deactivation pattern for cylinders of an engine, wherein N is an integer greater than two, each of the N predetermined cylinder activation/deactivation patterns including P indicators for the next P cylinder events, each of the P indicators indicating whether to activate or deactivate a corresponding one cylinder, and P is an integer greater than a total number of cylinders of the engine;
activating opening of intake and exhaust valves of first ones of the cylinders that are to be activated based on the desired cylinder activation/deactivation pattern;
deactivating opening of intake and exhaust valves of second ones of the cylinders that are to be deactivated based on the desired cylinder activation/deactivation pattern;
providing fuel to the first ones of the cylinders;
disabling fueling to the second ones of the cylinders;
determining M possible ones of the N cylinder activation/deactivation patterns, wherein M is an integer greater than or equal to one;
comparing portions of the M possible cylinder activation/deactivation patterns, respectively, with a portion of the desired cylinder activation/deactivation pattern; and
selectively updating the desired cylinder activation/deactivation pattern to one of the M possible cylinder activation/deactivation patterns based on the comparisons.
11. The cylinder control method of claim 10 further comprising retrieving the N predetermined cylinder activation/deactivation patterns from a pattern database.
12. The cylinder control method of claim 10 wherein the portion of the desired cylinder activation/deactivation pattern corresponds to the last Q indicators for the last Q events of the desired cylinder activation/deactivation pattern, and
wherein the portions of each of the M possible cylinder activation/deactivation patterns correspond to the first Q indicators of the first Q events of the M possible cylinder activation/deactivation patterns, wherein Q is an integer greater than one and less than or equal to P.
13. The cylinder control method of claim 10 further comprising determining the M possible cylinder activation/deactivation patterns based on engine speed.
14. The cylinder control method of claim 10 further comprising determining the M possible cylinder activation/deactivation patterns based on a requested torque output of the engine.
15. The cylinder control method of claim 10 further comprising determining the M possible cylinder activation/deactivation patterns based on a gear ratio of a transmission.
16. The cylinder control method of claim 10 further comprising determining the M possible cylinder activation/deactivation patterns based on an amount of air per cylinder.
17. The cylinder control method of claim 10 further comprising determining the M possible cylinder activation/deactivation patterns based on an amount of residual exhaust per cylinder.
18. The cylinder control method of claim 10 further comprising determining the M possible cylinder activation/deactivation patterns based on engine speed, a requested torque output of the engine, a gear ratio of a transmission, an amount of air per cylinder, and an amount of residual exhaust per cylinder.