Dynamic combustion characteristic sensor for internal combustion

Details Dynamic combustion characteristic sensor for internal combustion Dynamic combustion characteristic sensor for internal combustion

1983-06-20

1985-01-01

Gill, James J.

Measuring and testing

Engine detonation

Combustion signal compared to reference signal varied by a...

73714, G01L 2322

Patent

active

044910100

ABSTRACT:
A dynamic combustion characteristic sensor suitable for the detection of the timing of peak combustion pressure or the occurrence of knock in an internal combustion engine comprises an engine headbolt having a piezoelectric disc affixed to the surface of the bolt head. An insulator holds an inner terminal electrically connected to the upper side of the piezoelectric disc and is held by its lower periphery, along with a surrounding electrically conducting outer terminal by a vertical annular wall rising from the surface of the bolt head. The annular wall and outer terminal provide electrostatic shielding and a ground reference for the inner terminal, which is connected electrically by a shielded connector to a charge amplifier with a double pole high pass filter with a half power frequency of 0.5-1.0 Hertz to block signals generated by thermal strains in the engine.

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