Pressure sensor for cylinder of internal combustion engine, has filter eliminating low frequency components of voltage signal, and neutralizing unit neutralizing filter when shift frequency of pressure is lower than frequency threshold

摘要

The sensor (1) has a pressure sensitive element (2) connected in series with a conditioner (3) and producing an electric charge based on a pressure at which the sensitive element is subjected. The conditioner has an integrator (6) that integrates the electric charge for producing a voltage signal (Vs) indicating the pressure, and a high-pass filter (4) that eliminates low frequency components of the voltage signal. A neutralizing unit (5) neutralizes the high-pass filter when a shift frequency of the pressure is lower than a given frequency threshold.