DEVICE AND METHOD FOR MEASURING CYLINDER PRESSURE IN AN INTERNAL COMBUSTION ENGINE WITH ACTIVATION OR DEACTIVATION OF A FILTER ACCORDING TO THE ENGINE OPERATING STROKE

摘要

Device for measuring cylinder pressure in an internal combustion engine, comprising at least one pressure sensor (1) consisting of at least one piezoelectric element associated with a capacitive element, one output (10) generating a first voltage (V1) representative of a pressure (F) applied to the piezoelectric element, a filtering module (2) able to filter out parasitic low-frequency voltages and to generate a second voltage (V2), a switching module (4) for activating or deactivating the filtering module, a control module (3) capable of delivering a control signal (Scom) intended to control the switching module (4) in a way that is consistent with the engine operating strokes, an output (5) generating an output voltage (Vout) equal to the first voltage (V1) during a compression stroke or a combustion-expansion stroke, and equal to the second voltage (V2) during an inlet or exhaust stroke.