Temperature and pressure detecting type spark plug
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United States of America Patent
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-
Jan 15, 1991
Grant Date -
N/A
app pub date -
Mar 16, 1990
filing date -
Apr 3, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A temperature and pressure detecting type spark plug has a metallic shell having a mounting seat around an outer surface of the shell. The plug further has a center electrode which is placed into a tubular insulator. The center electrode has a hollow portion to enclose a thermocouple to detect a temperature of the front end of the center electrode. An annular pressure sensor is placed at the mounting seat of the metallic shell to detect a pressure within a combustion chamber in a cylinder head. The pressure sensor is arranged to be sandwiched between the mounting seat and the cylinder head when the spark plug is secured to the cylinder head of an internal combustion engine.
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