Pencil-type glow plug for use in combustion chamber pressure sensor system of e.g. diesel engine, measures chamber pressure based on electrical signal output by force measurement unit according to force generated due to pressure

摘要

The plug has a piezoelectric force measurement unit (130) and a temperature compensation unit (140) made of similar components for force measurement and temperature compensation. A heating body transmits a force generated based on a combustion chamber pressure to the force measurement unit and not to the compensation unit. The plug measures the pressure based on an electrical signal output by the measurement unit according to the force.