Engine air-fuel control for an engine with valves that may be deactivated
First Claim
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1. A method to control air-fuel ratios in individual cylinders of an internal combustion engine with electrically actuated valves, the method comprising:
- operating at least an electrically actuated valve in each cylinder combusting an air-fuel mixture during a cycle of said engine; and
correcting an air and fuel mixture supplied to each cylinder combusting an air-fuel mixture based on a desired air-fuel mixture in said each cylinder combusting an air-fuel mixture.
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Abstract
A system and method to control engine valve timing to improve air-fuel control in an engine with valves that may be deactivated. Valves that may be deactivated are controlled in a manner to improve detection of individual cylinder air-fuel ratios.
141 Citations
36 Claims
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1. A method to control air-fuel ratios in individual cylinders of an internal combustion engine with electrically actuated valves, the method comprising:
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operating at least an electrically actuated valve in each cylinder combusting an air-fuel mixture during a cycle of said engine; and
correcting an air and fuel mixture supplied to each cylinder combusting an air-fuel mixture based on a desired air-fuel mixture in said each cylinder combusting an air-fuel mixture. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for adjusting air-fuel ratio in internal combustion engine, the engine having at least a group of cylinders, with each cylinder of said cylinder group containing at least a valve that may be deactivated, the method comprising:
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adjusting timing of said at least a valve that may be deactivated for at least a cylinder of said cylinder group, increasing a crank angle interval between combustion in at least a first cylinder and combustion in at least a second cylinder, for at least a bank of said engine; and
correcting an air and fuel mixture supplied to said at least a second cylinder, based on a desired air-fuel mixture in said second cylinder. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method to control air-fuel ratio in a cylinder of an internal combustion engine with E electrically actuated valves, the method comprising:
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operating said internal combustion engine with at least one cylinder, said at least one cylinder having at least one electrically actuated valve;
sampling at least an oxygen sensor positioned in the exhaust of said internal combustion engine, downstream of said at least one cylinder having at least one electrically actuated valve, at least once each period associated with each combustion event of said at least one cylinder having at least one electrically actuated valve;
generating a feedback correction signal associated with each combustion event of said at least one cylinder having at least one electrically actuated valve, from said at least a sampled oxygen sensor; and
correcting at least a mixture of air and fuel supplied to said at least one cylinder, in response to said feedback correction signal associated with each combustion event of said at least one cylinder having at least one electrically actuated valve, for achieving a desired air-fuel ratio in said at least one cylinder. - View Dependent Claims (16, 17, 18)
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19. A method for adjusting air-fuel ratio in internal combustion engine, the engine having at least a group of cylinders, with each cylinder of said cylinder group containing at least an electrically actuated exhaust valve, the method comprising:
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adjusting said at least an electrically actuated exhaust valve timing based at least on an engine operating condition;
sampling at least a signal of at least an oxygen sensor positioned in the exhaust of said at least a group of cylinders, at least once each period associated with a combustion event of said each cylinder of said cylinder group containing at least an electrically actuated exhaust valve;
generating at least a feedback correction signal from said sampled oxygen sensor signal for each cylinder of said cylinder group containing at least an electrically actuated exhaust valve; and
correcting a mixture of air and fuel supplied to said each cylinder of said cylinder group containing at least an electrically actuated exhaust valve, in response to said at least a feedback correction signal from said sampled oxygen sensor signal for each cylinder of said cylinder group containing at least an electrically actuated exhaust valve, for achieving a desired air-fuel ratio in said each cylinder of said cylinder group containing at least an electrically actuated exhaust valve. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for adjusting air-fuel ratio in internal combustion engine, the engine having at least a first and a second group of cylinders, with each cylinder of said first cylinder group and said second cylinder group containing at least an electrically actuated valve, the method comprising:
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in a first mode, adjusting timing of said at least an electrically actuated valve for at least a cylinder of said first cylinder group, increasing a crank angle interval between combustion in at least a first cylinder and combustion in at least a second cylinder, for at least a bank of said engine;
correcting an air and fuel mixture supplied to said at least a second cylinder, based on a desired air-fuel mixture in said second cylinder;
in a second mode, adjusting timing of said at least an electrically actuated valve for at least a cylinder of said second cylinder group, increasing a crank angle interval between combustion in at least a third cylinder and combustion in at least a forth cylinder, for at least a bank of said engine; and
correcting an air and fuel mixture supplied to said at least a forth cylinder, based on a desired air-fuel mixture in said forth cylinder. - View Dependent Claims (30, 31, 32, 33, 34)
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35. A system for adjusting air-fuel in an internal combustion engine with electrically actuated valves, the system comprising:
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an internal combustion engine having at least an electrically actuated valve in each cylinder;
at least an oxygen sensor and located in an exhaust passage downstream of said each cylinder;
a controller to operating at least an electrically actuated valve in each cylinder combusting an air-fuel mixture during a cycle of said cylinder; and
correcting an air and fuel mixture supplied to said each cylinder combusting an air-fuel mixture, based on a desired air-fuel mixture in said each cylinder combusting an air-fuel mixture.
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36. A computer readable storage medium having stored data representing instructions executable by a computer to control an internal combustion engine of a vehicle, said storage medium comprising:
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instructions for operating at least an electrically actuated valve in each cylinder combusting an air-fuel mixture during a cycle of said engine; and
correcting an air and fuel mixture supplied to said each cylinder combusting an air-fuel mixture, based on a desired air-fuel mixture in said each cylinder combusting an air-fuel mixture.
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Specification