FIELD: machine building; engine building.
SUBSTANCE: invention relates to an exhaust gases sensor connected to an exhaust system of an internal combustion engine. Disclosed are methods and system for determining content of alcohol in fuel injected into engine, according to output signals of sensor of exhaust gases. In one example, the method comprises determining a first estimated alcohol content in fuel based on an air-fuel ratio determined using an oxygen sensor in the exhaust gases, and determining the second estimated value of alcohol content in fuel by changing the output signal of the sensor when modulating the reference voltage of the oxygen sensor in the exhaust gases between the first and second voltage values. Method further comprises controlling engine parameters depending on difference between first and second alcohol content in fuel.
EFFECT: invention discloses methods and a system for determining content of alcohol in fuel with possibility of controlling engine parameters based on the obtained estimate.
20 cl, 11 dwg
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