Patent ID: 8209111

Claim:
A device (D) for processing analog knock signals delivered by a sensor (C) of an internal combustion engine (M) coupled to an engine monitoring unit (UC), said device (D) comprising processing means (MT) arranged to convert values of the analog signals acquired by said sensor (C) at known instants into representative digital samples, then to temporarily store the samples whose acquisition instants are contained in a chosen time window (FT), and to apply chosen digital processing operations to said stored samples so as to deliver a digital output signal representative of the knock of the engine (M) during said time window, characterized in that said processing means (MT) are arranged: i) to apply a chosen digital preprocessing operation to the stored samples whose acquisition instants coincide with instants of occurrence, known to the engine monitoring unit (UC), of events occurring in said engine (M) which generate a noise that interferes with said analog signals, so as to reduce the respective contributions of these stored samples to said digital output signal, and ii) to adapt at least one of said digital processing operations according to the number of stored samples that are the subjects of a coincidence.