Patent ID: 9638117
Date: 2017-05-02
CPC Classifications: F02D

Claim:
1. A method for operating a vehicular engine that comprises a plurality of pistons and a plurality of cylinders, the method comprising: detecting an engine temperature; detecting an alcohol concentration of fuel; selecting an amount of fuel according to the engine temperature and the alcohol concentration; detecting each occurrence of a top dead center event of at least one of the cylinders; providing a predetermined fuel enrichment map that defines a relationship, using three-dimensional plots, of a plurality of fuel enrichment coefficients, a plurality of engine temperatures, and a plurality of occurrences of top dead center events; selecting one of the plurality of fuel enrichment coefficients based on each of: determining an injection amount of fuel by multiplying the selected amount of fuel and the selected fuel enrichment coefficient; and selectively dispensing the amount of fuel to the cylinders according to the injection amount of fuel.