Method for parameter learning of a control valve of a high pressure variable delivery fuel pump

摘要

A method for self-learning of the variation of a nominal functioning feature (A) of a high pressure pump (6) in an internal combustion engine (2). Said pump feeds fuel to a common rail (5) and is controlled by a solenoid valve (22) depending on an objective pressure inside the common rail (5) and by using the nominal functioning feature (A) which provides a delivery of fuel. In cut-off conditions of the engine (2), the method includes determining the value of the pressure leaks (”P leak ) due to blow-by in the common rail (5); measuring the real pressure (P) of the fuel inside the common rail (5); actuating the high pressure pump (6) by controlling the solenoid valve (22) with a predetermined closing angle; measuring the real pressure (P real ) of the fuel inside the common rail (5) again; determining a pressure deviation between the real pressure (P real ) and an expected pressure (P exp ) of the fuel, and correcting the nominal functioning feature (A) according to this deviation.