DETERMINATION OF A DRIFT OF THE STATIC FUEL FLOW OF A PIEZO-ELECTRIC INJECTOR OF A MOTOR VEHICLE THERMAL ENGINE

摘要

A method is disclosed for determining a drift in the static fuel flow rate of a piezoelectric injector of a heat engine of a motor vehicle. The method relies on measurements of the fluid pressure made in the supply chamber of the injectors to calculate a measured static flow value. This value is compared to a nominal static flow rate to determine the possible existence and magnitude of static flow drift. In addition, each pressure measurement is taken when the injector valve is closed and the injector is open. In this way, the calculation of the measured static flow is not influenced by pressure variation effects that are irrelevant to the measurement. Figure for the abstract: Fig. 4