Piezoelectric pressure transmitter for an internal combustion engine

摘要

A cylinder pressure transmitter has means mounting piezoelectric means to provide an electrical signal corresponding to the pressure in a cylinder of an internal combustion engine. A metal diaphragm is arranged to be movable in response to variations in cylinder pressure. Rigid metal motion transfer means and rigid motion transfer means of a material of relatively lower thermal conductivity are arranged in sequence between the diaphragm and the piezoelectric means to accurately transfer movements of the diaphragm to the piezoelectric means while retarding transfer of heat from the cylinder environment to the piezoelectric means through the diaphragm. Preferably the diaphragm is formed of a clad metal laminate.