Fuel identification based on crankshaft acceleration
First Claim
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1. A method for an engine cylinder bank, comprising:
- generating a series of rich and lean conditions in engine bank cylinders according to a predetermined pattern correlated to engine firing order, while keeping the bank at stoichiometry on average; and
adjusting fuel injection to the engine based on a fuel alcohol content identified from crankshaft acceleration and the predetermined pattern.
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Abstract
Systems and methods for identifying alcohol content of a fuel in an engine. In one example approach, a method comprises adjusting fuel injection to the engine based on fuel alcohol content identified from crankshaft acceleration. For example, the crankshaft acceleration may be generated by modulating an air/fuel ratio in a selected cylinder across a range of air/fuel ratios while keeping the engine at stoichiometry.
27 Citations
10 Claims
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1. A method for an engine cylinder bank, comprising:
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generating a series of rich and lean conditions in engine bank cylinders according to a predetermined pattern correlated to engine firing order, while keeping the bank at stoichiometry on average; and adjusting fuel injection to the engine based on a fuel alcohol content identified from crankshaft acceleration and the predetermined pattern. - View Dependent Claims (2, 3, 4, 5)
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6. A method for an engine comprising:
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generating crankshaft accelerations by modulating an air/fuel ratio in a cylinder across a range of lean, rich, and stoichiometric air/fuel ratios according to a predetermined pattern correlated to engine firing order, while keeping the engine at stoichiometry on average; and identifying a fuel alcohol content based on a slope or shape of a mapping of the crankshaft accelerations versus the modulated air/fuel ratios of the pattern and the predetermined pattern. - View Dependent Claims (7, 8, 9)
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10. A method for an engine having cylinders, comprising:
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generating a series of rich and lean conditions across all engine cylinders according to a predetermined pattern correlated to engine firing order with different magnitude shifts from stoichiometry, while keeping the engine at stoichiometry on average across all engine cylinders; and adjusting fuel injection to the engine based on a fuel alcohol content identified from crankshaft accelerations and the predetermined pattern.
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Specification