Marelli Autronica S.p.a.

Gian Maria Timossi

Giuseppina Rossi

Dell'Orto

The transducer comprises a support structure carrying piezoresistive sensors, particularly of the thick-film type, which are intended to be resiliently deformed by the fluid pressure to be measured and to provide an electrical signal indicative of the value of the pressure. The support structure comprises a substantially mushroom-shaped metal body with a head and a shank. An axial blind hole is formed in the shank and is intended to contain the fluid whose pressure is to be measured. The hole also extends into the head and, with the end surface of the head, defines a wall which is resiliently deformable by the pressure to be measured. The piezoresistive sensors are connected to the end surface of the head of the mushroom-shaped body in correspondence with or adjacent the deformable wall so that they can in turn be deformed as a result of the deformation of the wall. The piezoresistive sensors are deposited on a thin plate fixed to the upper surface of the head of the mushroom-shaped body. The plate also carries the components of the circuits for amplifying and processing the signals generated by the sensors. A metal structure is also connected to the mushroom-shaped body to screen it from radio-frequency interference.

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Piacenza, Italy

Gian Maria Timossi