Method and device for monitoring the operation of the fuel injection system of an internal combustion engine

摘要

A method for monitoring the operation of the fuel injection system of an internal combustion engine comprising the steps of: - determining a thermal load criticality index (I) of an injector of the fuel injection system, which is instantaneously induced by evaluating a plurality of sensor signals associated with the internal combustion engine sensors Power (P) of the internal combustion engine, the instantaneous fuel temperature (T), the instantaneous energy demand (E) and the instantaneous injection duration (τ) are determined as parameters, and wherein the criticality index (I) by an addition of said, each with an associated weighting factor ( k1, k2, k3, k4) - checking whether the determined criticality index is greater than a threshold (SW1), - if the determined criticality index is greater than the threshold, then Check if the determined criticality is ex for a predetermined period of time (t1) is greater than the threshold value; and initiate a measure (RE1) to reduce the thermal load on the injector when the determined criticality index (I) for the predetermined time period (t1) is greater than the threshold (SW1).