METHOD FOR DETERMINING A FUNCTIONING PARAMETER OF AN ENGINE

摘要

The invention concerns a method for determining an internal combustion engine functioning parameter on the basis of three control parameters (N, P, lambda ) of said engine, characterised in that it consists in: producing a first map (C1) of the functioning parameter ( alpha ) on the basis of the other two control parameters (N, P), the third control parameter ( lambda ) being fixed at a first value; producing a second map (C2) of the functioning parameter ( alpha ) on the basis of the same two control parameters (N, P), the third control parameter ( lambda ) being fixed at a second value; establishing a relationship f( lambda ) between the first functioning parameter ( alpha ) and the third control parameter ( lambda ) over the whole range of variation of said parameter in at least one specific operating point (N, P); applying said relationship to determine the functioning parameter ( alpha ) on the basis of the three control parameters (N, P lambda ) in all the operating points of the engine.