Method to adapt engine fuel control, by multi-component vaporization method, to actual volatility quality of fuel

摘要

A system (12) and method for controlling the injection of fuel into a cylinder (14) of an internal combustion engine (10) are provided. The system (12) includes a fuel injector (22), a temperature sensor (48), and an electronic control unit (ECU) (50). The fuel is parsed into a plurality of components based on the boiling points of elements of the fuel. ECU (50) stores mass fraction values for each component relative to the total mass of a sample of the fuel along with vaporization rates for each component. These values are used by the ECU (50) to account for different vaporization rates among fuel elements. In accordance with the invention, ECU (50) is further configured to adjust the mass fraction values responsive to the combustion air-fuel ratio and the engine temperature to account for the different volatility characteristics of various fuels.