Patent ID: 7475683
Filing Date: 2009-01-13
Classification: F02D,Y02T

Abstract:
1. A fuel injection control apparatus for a variable-fuel engine, said apparatus comprising: a memory storage medium which stores a plurality of fuel injection control maps in which a state of an engine is related to a basic fuel injection time in response to a concentration of alcohol contained in the fuel; an alcohol concentration sensor which detects the concentration of alcohol contained in the fuel; a map changeover selector for selecting a currently applicable fuel injection control map from the plurality of fuel injection control maps stored in the memory storage medium in response to the concentration of alcohol detected by the alcohol concentration sensor; and a fuel injection time calculator which determines a currently applicable basic fuel injection time using the currently selected fuel injection control map in response to a state of the engine, where a quantity of fuel injected is proportional to the basic fuel injection time; wherein the injection time calculator is operable to update a correction factor according to the formula Kref where Kref β represents an averaging coefficient; KO Kref