Method to reduce engine emissions for an engine capable of multi-stroke operation and having a catalyst
First Claim
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1. A method for controlling the number of cylinder strokes in at least a cylinder operating in a internal combustion engine, the method comprising:
- operating at least a cylinder with a first number of strokes in a cycle of said cylinder, during at least a first operating condition of a catalyst; and
operating said cylinder with a second number of strokes in a cycle of said cylinder, during a second catalyst operating condition, said second catalyst operating condition different from said first catalyst operating condition.
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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
36 Claims
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1. A method for controlling the number of cylinder strokes in at least a cylinder operating in a internal combustion engine, the method comprising:
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operating at least a cylinder with a first number of strokes in a cycle of said cylinder, during at least a first operating condition of a catalyst; and
operating said cylinder with a second number of strokes in a cycle of said cylinder, during a second catalyst operating condition, said second catalyst operating condition different from said first catalyst operating condition. - View Dependent Claims (2, 3, 4)
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5. A method for controlling the number of cylinder valves in at least a cylinder operating in a internal combustion engine, the method comprising:
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operating at least a cylinder with a first number of valves in a cycle of said cylinder, during at least a first operating condition of a catalyst; and
operating said cylinder with a second number of valves in a cycle of said cylinder, during a second catalyst operating condition, said second catalyst operating condition different from said first catalyst operating condition. - View Dependent Claims (6, 7, 8)
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9. A method for controlling the valve pattern in at least a cylinder operating in a internal combustion engine, the method comprising:
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operating at least a cylinder with a first valve pattern in a cycle of said cylinder, during at least a first operating condition of a catalyst; and
operating said cylinder with a second valve pattern in a cycle of said cylinder, during a second catalyst operating condition, said second catalyst operating condition different from said first catalyst operating condition. - View Dependent Claims (10, 11, 12)
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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. 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;
determining a number of valves to operate in said selected cylinders, based on said catalyst brick operating condition; and
operating said number of valves in said selected cylinders during a cycle of said internal combustion engine. - View Dependent Claims (31, 32)
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33. A method for determining the number of cylinder strokes and valve pattern 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;
determining a valve pattern to operate in said selected cylinders, based on said catalyst brick operating condition; and
operating said number of valves in said selected cylinders during a cycle of said internal combustion engine.
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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. 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 a cylinder with a first number of strokes in a cycle of said cylinder, based at least on an operating condition of a catalyst; and
operating said cylinder with a second number of strokes in a cycle of said cylinder, based on a change in said catalyst operating condition.
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36. A method for controlling the number of cylinder strokes in at least a cylinder operating in a internal combustion engine, the method comprising:
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operating at least a cylinder with a first number of strokes in a cycle of said cylinder, based at least on an operating condition of a catalyst; and
operating said cylinder with a second number of strokes in a cycle of said cylinder, based on a change in said catalyst operating condition.
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Specification