Coordination of variable cam timing and variable...

Details Coordination of variable cam timing and variable... Coordination of variable cam timing and variable...

2009-05-01

2010-11-16

Cronin, Stephen K (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C123S090120, C123S090130, C123S19800E

Reexamination Certificate

active

07835848

ABSTRACT:
A method of controlling an engine with a first group of cylinders having selectively deactivatable cylinders valves and a variable camshaft timing actuator coupled in a hydraulic system is described. In one example, the method includes during a first mode where the first group of cylinders is activated to carry out combustion cycles, adjusting the hydraulic system with a first gain based on cam timing feedback information and/or maintaining a null position of the actuator by adjusting a control signal to the hydraulic system to within a first value range. During a second mode where the first group of cylinders is deactivated, the method includes adjusting the hydraulic system with a second gain based on cam timing feedback information, the second gain higher than the first gain and/or maintaining the null position of the actuator by adjusting the control signal to the hydraulic system to within a second value range.

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Rollinger, John Eric et al., “Coordination of Variable Cam Timing and Variable Displacement Engine Systems,” U.S. Appl. No. 12/372,481, filed Feb. 17, 2009, 31 pages.

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