COORDINATION OF VARIABLE CAM TIMING AND VARIABLE DISPLACEMENT ENGINE SYSTEMS
First Claim
1. A method of controlling an engine, the engine including a first group of cylinders having selectively deactivatable cylinders valves, the engine further including a variable camshaft timing actuator coupled in a hydraulic system, the method comprising:
- during a first mode of engine operation 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
during a second mode of engine operation where the first group of cylinders is deactivated, adjusting the hydraulic system with a second gain based on cam timing feedback information, the second gain higher than the first gain.
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Accused Products
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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Citations
20 Claims
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1. A method of controlling an engine, the engine including a first group of cylinders having selectively deactivatable cylinders valves, the engine further including a variable camshaft timing actuator coupled in a hydraulic system, the method comprising:
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during a first mode of engine operation 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 during a second mode of engine operation where the first group of cylinders is deactivated, adjusting the hydraulic system with a second gain based on cam timing feedback information, the second gain higher than the first gain. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of controlling an engine, the engine including a first group of cylinders having selectively deactivatable cylinders valves and a second group of cylinders without selectively deactivatable cylinders valves, the engine further including a hydraulic variable camshaft timing actuator coupled in a hydraulic system, the hydraulic system including a spool valve coupled to the hydraulic variable camshaft timing actuator, the spool valve actuated by a solenoid, the method comprising:
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during a first mode of engine operation where the first and second groups of cylinders are activated to carry out combustion cycles, maintaining a null position of the hydraulic variable camshaft timing actuator by adjusting a control signal to the solenoid to within a first value range; and during a second mode of engine operation where the first group of cylinders is deactivated and the second group of cylinders carries out combustion cycles, maintaining the null position of the hydraulic actuator by adjusting the control signal to within a second value range. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of controlling an engine, the engine including a first group of cylinders having selectively deactivatable cylinders valves and a second group of cylinders without selectively deactivatable cylinders valves, the engine further including a hydraulic variable camshaft timing actuator coupled in a hydraulic system, the hydraulic system including a spool valve coupled to the hydraulic variable camshaft timing actuator, the spool valve actuated by a solenoid, the method comprising:
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during a first mode of engine operation where the first and second groups of cylinders are activated to carry out combustion cycles, adjusting a control signal to the solenoid with a first feedback control gain based on cam timing feedback information and further maintaining a null position of the hydraulic variable camshaft timing actuator by further adjusting the signal to within a first value range; and during a second mode of engine operation where the first group of cylinders is deactivated and the second group of cylinders carries out combustion cycles, adjusting the control signal with a second feedback control gain based on cam timing feedback information and further maintaining the null position of the hydraulic actuator by further adjusting the signal to within a second value range, the second gain higher than the first gain, and the second range greater than the first range. - View Dependent Claims (18, 19, 20)
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Specification