Fuel identification based on crankshaft acceleration
First Claim
Patent Images
1. A method for an engine with first and second cylinder banks, comprising:
- generating first and second series of rich and lean conditions in the first and second bank cylinders according to first and second, different, predetermined patterns correlated to engine firing order, respectively, while keeping the banks 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.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
13 Claims
-
1. A method for an engine with first and second cylinder banks, comprising:
-
generating first and second series of rich and lean conditions in the first and second bank cylinders according to first and second, different, predetermined patterns correlated to engine firing order, respectively, while keeping the banks 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, 6, 7, 8)
-
-
9. A method for an engine comprising:
-
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, the engine including a turbocharger; 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 (10, 11, 12)
-
-
13. A method for an engine having cylinders, comprising:
-
generating a series of rich and lean conditions across all engine cylinders via direct fuel injection 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.
-
Specification