Method to adjust an oil control valve actuation response time using cylinder valve diagnostics
OwnerDaniel G. Brennan, Allen B. Rayl, Jr. +1inventors
InventorsDaniel G. Brennan, Allen B. Rayl, Jr., Brian K. Kowalczyk
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Abstract
A method to adjust an oil control valve actuation response time using cylinder valve diagnostic results includes commanding an engine cylinder to deactivate/reactive when conditions are met and then detecting if a deactivation/reactivation response time failure has occurred by analyzing the cylinder diagnostics results. If a predetermined number of failures are detected at the cylinder within a predetermined number of engine cycles then the engine controller operates to adjust the oil control valve response time to improve the response time accuracy.
Claims20
A method to adjust an oil control valve actuation response time using cylinder valve diagnostics comprising:
- determining if conditions are met for cylinder deactivation;
- commanding at least one cylinder to deactivate when conditions for deactivation are met;
- detecting if a high pressure exhaust charge spring is within the at least one deactivated cylinder;
- detecting if the at least one cylinder has failed to deactivate if a high pressure exhaust charge spring is not detected;
- detecting if the at least one cylinder has failed to deactivate on a next engine cycle if the at least one cylinder failed to deactivate on the previous engine cycle;
- detecting if the at least one cylinder has failed to deactivate a predetermined number of times within a predetermined number of engine cycles;
- and
- incrementing an oil control valve deactivate response time by a predetermined increment if incrementing the response time will not exceed a predetermined maximum response threshold when the at least one cylinder has failed to deactivate a predetermined number of times within a predetermined number of engine cycles.
Dependencies are inferred from the claim text.