Method and system for operating variable displacement internal combustion engine
First Claim
1. A method of operating an internal combustion engine having a variable cam timing (VCT) mechanism in cooperation with a plurality of deactivatable cylinders and corresponding intake valves, comprising:
- scheduling a transition mode of the engine;
determining a desired engine torque during the transition mode;
determining a VCT phase angle based on the desired engine torque; and
operating the VCT mechanism in accordance with the VCT phase angle to provide the desired engine torque during the transition mode.
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Accused Products
Abstract
A method of operating an internal combustion engine having a variable cam timing mechanism in cooperation with a plurality of deactivatable cylinders and corresponding intake valves includes the steps of scheduling a transition mode of the engine, determining a desired engine torque during the transition mode, determining a VCT phase angle based on the desired engine torque and operating the variable cam timing mechanism in accordance with the VCT phase angle to provide the desired engine torque during the transition mode.
37 Citations
17 Claims
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1. A method of operating an internal combustion engine having a variable cam timing (VCT) mechanism in cooperation with a plurality of deactivatable cylinders and corresponding intake valves, comprising:
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scheduling a transition mode of the engine;
determining a desired engine torque during the transition mode;
determining a VCT phase angle based on the desired engine torque; and
operating the VCT mechanism in accordance with the VCT phase angle to provide the desired engine torque during the transition mode. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of transitioning operation of a variable displacement internal combustion engine from a first cylinder mode to a second cylinder mode, the engine having an electronic throttle, an ignition system and a variable cam timing (VCT) mechanism in cooperation with a plurality of deactivatable cylinders and corresponding intake valves, the method comprising;
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scheduling a transition from the first cylinder mode to the second cylinder mode;
determining a cylinder air charge required to produce a desired engine torque output during the transition;
operating the electronic throttle to provide the desired cylinder air charge during the scheduled transition;
determining a VCT phase angle, based on the desired cylinder air charge, required to maintain the desired engine torque output during the transition; and
applying the VCT phase angle to the VCT to maintain the desired engine torque output during the transition. - View Dependent Claims (8, 9, 10)
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11. A system for operating an internal combustion engine having an intake manifold, an electronic throttle, an ignition system and a variable cam timing mechanism in cooperation with a plurality of deactivatable cylinders, the system comprising:
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at least one sensor for providing signals indicative of engine manifold absolute pressure (MAP); and
a controller coupled to the sensor for receiving a signal from the MAP sensor, said controller comprising;
means for scheduling a transition mode of the engine;
means for determining a desired engine torque during the transition mode;
means for determining a VCT phase angle based on the desired engine torque; and
means for operating the VCT mechanism in accordance with the VCT phase angle to provide the desired engine torque during the transition mode. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An article of manufacture for operating an internal combustion engine having an intake manifold, an electronic throttle, an ignition system and a variable cam timing mechanism in cooperation with a plurality of deactivatable cylinders, the article of manufacture comprising:
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a computer usable medium; and
a computer readable program code embodied in the computer usable medium for directing a computer to control the steps of scheduling a transition mode of the engine, determining a desired engine torque during the transition mode, determining a VCT phase angle based on the desired engine torque, and operating the VCT mechanism in accordance with the VCT phase angle to provide the desired engine torque during the transition mode.
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Specification