DETERMINATION OF OPENING CHARACTERISTICS OF A FUEL INJECTOR

A determination method of opening characteristics of a fuel injector in an internal combustion engine comprising a knock sensor capable of generating a signal representative of vibrations. The knock sensor is used to determine the opening characteristics of the fuel injector. The determination method comprises acquiring the knock sensor signal over a predetermined measurement window synchronised on an injection control signal; and analysing the sensor signal over the measurement window in order to determine a first alternation of a first wave train and to determine the local maximum of the first alternation. The fuel injection is controlled based on the opening characteristic of the injector determined based on this local maximum.