Internal combustion engine control
First Claim
1. An engine control method for controlling combustion of an air/fuel mixture in a cylinder of a two stroke cycle internal combustion engine in response to a diagnosed misfire condition to improve cylinder combustion quality, comprising the steps of:
- diagnosing a misfire condition in the engine cylinder;
referencing a stored skip value representing an engine operating period over which combustion events in the cylinder are to be postponed following diagnosis of the misfire condition; and
postponing combustion events in the engine cylinder over the engine operating period in response to the diagnosed misfire condition.
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Accused Products
Abstract
Two stroke internal combustion engine control compensates for diagnosed cylinder misfire conditions characterized by improper combustion, during a cylinder combustion event, of an air/fuel mixture in an engine cylinder by learning a required number of cylinder combustion events to periodically be skipped to allow for removal of residual combustion elements from the cylinder following improper combustion therein, and by periodically postponing cylinder combustion over the learned number of events. The learned number of events may vary across engine cylinders, across engine operating conditions, and further may vary as a function of each cylinder'"'"'s misfire propensity and severity over various engine operating conditions.
46 Citations
12 Claims
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1. An engine control method for controlling combustion of an air/fuel mixture in a cylinder of a two stroke cycle internal combustion engine in response to a diagnosed misfire condition to improve cylinder combustion quality, comprising the steps of:
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diagnosing a misfire condition in the engine cylinder; referencing a stored skip value representing an engine operating period over which combustion events in the cylinder are to be postponed following diagnosis of the misfire condition; and postponing combustion events in the engine cylinder over the engine operating period in response to the diagnosed misfire condition. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A misfire compensation method for selectively delivering fuel and an ignition signal to a two stroke engine cylinder to compensate for cylinder misfire conditions, the fuel being provided to the cylinder for mixing with cylinder intake air prior to each successive cylinder combustion event and the ignition signal being provided to a spark plug corresponding to the engine cylinder to ignite the mixed fuel and air within the cylinder at each executed cylinder combustion event, the method comprising the steps of:
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estimating a cylinder misfire propensity representing the propensity for improper ignition of the mixed fuel and air within the cylinder; determining a skip value as a function of the estimated propensity, the skip value representing a number of cylinder combustion events to be skipped following an executed cylinder combustion event to compensate for the misfire propensity of the engine cylinder; suspending delivery of at least one of fuel to the cylinder and the ignition signal to the spark plug corresponding to the cylinder for the number of combustion events indicated by the skip value. - View Dependent Claims (9, 10, 11, 12)
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Specification