| 摘要 |
A method for estimating a level of ethanol in a fuel injected into an internal combustion engine over a number (n) of cycles (n being an integer greater than or equal to 1). The method includes: determining start of combustion of an injected fuel for each of the cycles; calculating the average combustion start angle from combustion start angles recorded for all of the n cycles; determining the end of combustion of an injected fuel for each of the cycles; calculating the average combustion end angle from the combustion end angles recorded for all of the n cycles; calculating the combustion time between the combustion start time and the combustion end time; and deducting the level of ethanol from the combustion time on the basis of a pre-determined model or a list of combustion times and associated ethanol levels.
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