Method of determining in real time the flow rate characteristic of a fuel injector

摘要

The method comprises the steps consisting in assuming that the gain of at least one injector is equal to a theoretical gain or an updated gain, and in replacing each of at least one reference injection of injection control duration controlled by the engine control unit in application of a stored characteristic, with a multiple injection comprising a succession of at least two injections of injection control durations that are assumed to cause the same mass of fuel to be injected as by the replaced reference injection, in determining the fuel mass difference between the reference injection and the multiple injection, in deducing therefrom an error in determining the characteristic, and in modifying the gain and/or the offset of the linear zone of the initial characteristic or at least a table or mathematical relationship for the non-linear zone of said characteristic, so as to compensate the error, and storing the new characteristic as determined in this way. Applications to real time determination as a function of the injection control duration of the flow rate characteristic of fuel injectors for internal combustion engines fed by injection.