Patent ID: 6360733
Filing Date: 2002-03-26
Classification: F02D

Abstract:
A self-adapting method for controlling the mixture ratio of an injection system (2), of an internal combustion engine (4), comprising a number of injectors (18), each for injecting a respective operating quantity (QF) of fuel at each engine cycle; and a stoichiometric composition sensor (12) generating a composition signal (V) related to the stoichiometric composition of the exhaust gases produced by said engine (4); in each operating state of the engine (4) and for each said injector (18), said method comprising the steps of:a) determining a nominal quantity (QA) of fuel to be injected; b) determining an operating parameter (KO2) as a function of said composition signal (V) and of a proportional-integral regulating function; c) determining a current hot correction coefficient (KCO) indicating a correction to be made to said nominal quantity (QA) of fuel to take into account the effect on injection of deviation of said engine (4) and said injection system (2) from nominal values thereof upon the engine (4) reaching normal operating temperatures; and d) determining said operating quantity (QF) of fuel to be injected as a function of said nominal quantity (QA), of said operating parameter (KO2), and of said current hot correction coefficient (KCO).