Combustion pressure peak detector for combustion control for an internal combustion engine

摘要

A combustion pressure peak detector comprised of a pair of flat annular piezo-electric elements separated by a flat metal electrode plate are located on a bolt for securing a cylinder head to a block of an internal combustion engine. The piezo-electric elements are engaged on opposite sides by two pressure plates adapted to engage the head of the bolt and the cylinder head respectively. At least one of the pressure plates may have a cup-shaped configuration for enclosing the piezo-electric unit and an inter-fitting projection and notch arrangement may be provided on the respective pressure plates to prevent relative rotation between the two pressure plates during tightening of the bolt.