METHOD TO REDUCE ENGINE EMISSIONS FOR AN ENGINE CAPABLE OF MULTI-STROKE OPERATION AND HAVING A CATALYST
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Accused Products
Abstract
A method to control valves in a cylinder operating in a multi-stroke cylinder mode. Valves are controlled to improve engine emissions as operating conditions vary.
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Citations
35 Claims
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1-12. -12. (canceled)
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13. A method for determining the number of cylinder strokes in a cycle an internal combustion engine, the method comprising:
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determining an operating state of at least one catalyst brick located in an exhaust system of said internal combustion engine; determining a number of cylinder strokes to delay a valve opening, in respective cylinders of said engine, after a combustion event, in respective cylinders, based on said catalyst brick operating state. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for determining the number of cylinder strokes in a cycle of a cylinder of an internal combustion engine, the method comprising:
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determining an operating condition of at least one catalyst brick located in an exhaust system of said internal combustion engine; selecting a number of cylinders in which to delay a valve opening after a combustion event in respective cylinders based on said catalyst brick operating condition. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A method for determining the number of cylinder strokes in a cycle of a cylinder of an internal combustion engine, the method comprising:
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determining an operating condition of at least one catalyst brick located in an exhaust system of said internal combustion engine; selecting a number of cylinders in which to delay a valve opening after a combustion event in respective cylinders based on said catalyst brick operating condition; and adjusting an air-fuel mixture in said number of selected cylinders. - View Dependent Claims (26, 27, 28, 29)
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30-33. -33. (canceled)
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34. A method for determining a valve pattern to operate in an internal combustion engine operating in a multi-stroke cylinder mode, the method comprising:
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determining an operating condition of at least one catalyst brick located in an exhaust system of said internal combustion engine; operating at least two groups of cylinders, a first group operating in a first cylinder stroke mode, and a second group operating in a second cylinder stroke mode; and determining a valve pattern to operate, based on said operating condition, in said first cylinder group and in said second cylinder group.
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35-36. -36. (canceled)
Specification