Automated method for cold transient fuel compensation calibration

摘要

An automated method for generating compensation values for use in an electronic engine controller during transient engine operation comprises an initial step of exposing an engine to an ambient temperature value to set the engine to an initial start temperature. The engine is started and operated in a predetermined manner until the engine reaches a stable operating temperature. The mass flow rate of air into an induction system of the engine is detected to generate a plurality of air flow values, the temperature of engine coolant is detected to generate a plurality of engine coolant temperature values and the composition of exhaust gas produced by the engine is detected to generate a plurality of exhaust gas values. The detected air flow values, engine coolant temperature values and exhaust gas values are stored in a data storage means. The engine is exposed to a plurality of ambient temperatures to generate data indicative of engine operation from a plurality of initial start temperatures. A first set of model values, indicative of a portion of fuel injected by the engine which directly impacts the induction system and a second set of model values indicative of a time constant corresponding to a rate at which fuel leaves the walls of the induction system are calculated as a function of the stored values. The compensation values are then generated as a function of the first and the second model values.