Methods and system for fuel ethanol content estimation and engine control
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United States of America Patent
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Dec 27, 2016
Grant Date -
Aug 25, 2016
app pub date -
Feb 19, 2015
filing date -
Feb 19, 2015
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Abstract
Methods and systems are provided for determining an amount of alcohol in fuel injected into an engine based on outputs from an exhaust gas sensor. In one example, a method includes estimating a first fuel alcohol content based on an air-fuel ratio estimated with the exhaust oxygen sensor and estimating a second fuel alcohol content based on a change in sensor output during modulating a reference voltage of the exhaust oxygen sensor between a first and second voltage. The method further includes adjusting engine operation based on a difference between the first and second fuel alcohol contents.
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