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 piston strokes in at least a cylinder operating in an internal combustion engine, the method comprising:
- operating at least a cylinder with a first number of piston strokes in a cycle of said cylinder based on at least a first operating condition of a catalyst; and
operating said cylinder with a second number of piston strokes in a cycle of said cylinder based on at least a second catalyst operating condition, said second catalyst operating condition different from said first catalyst operating condition, the second number of piston strokes different than the first number of piston strokes.
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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.
76 Citations
9 Claims
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1. A method for controlling the number of cylinder piston strokes in at least a cylinder operating in an internal combustion engine, the method comprising:
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operating at least a cylinder with a first number of piston strokes in a cycle of said cylinder based on at least a first operating condition of a catalyst; and operating said cylinder with a second number of piston strokes in a cycle of said cylinder based on at least a second catalyst operating condition, said second catalyst operating condition different from said first catalyst operating condition, the second number of piston strokes different than the first number of piston strokes. - View Dependent Claims (2, 3, 4)
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5. 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 and varying a number of valves to operate in each of said selected cylinders based on said catalyst brick operating condition; and operating said number of valves in each of said selected cylinders during the cycle of the cylinder of said internal combustion engine. - View Dependent Claims (6, 7)
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8. 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 piston strokes in a cycle of said cylinder based on at least on a first operating condition of a catalyst; and instructions for operating said cylinder with a second number of piston strokes in a cycle of said cylinder based on at least a second catalyst operating condition, said second catalyst operating condition different from said first catalyst operating condition, said second number of piston strokes different than the first number of piston strokes.
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9. A method for controlling the number of cylinder piston strokes in at least a cylinder operating in an internal combustion engine, comprising:
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operating at least a cylinder with a first number of piston strokes in a cycle of said cylinder, said first number of piston strokes in said cycle of said cylinder based at least on an oxidant state of a catalyst; and operating said cylinder with a second number of piston strokes in a cycle of said cylinder, said second number of piston strokes in said cycle of said cylinder based on a change in said oxidant state of said catalyst, said second number of piston strokes different than said first number of piston strokes.
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Specification