Knock detecting apparatus for internal combustion engines
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United States of America Patent
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-
Jul 31, 1984
Grant Date -
N/A
app pub date -
Mar 3, 1982
filing date -
Mar 6, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A knock detecting apparatus for detecting the occurrence of knocking in an internal combustion engine by detecting variations in the pressure of engine cooling water. A sealed double diaphragm structure is formed by a first diaphragm which is directly responsive to variations in the cooling water pressure and not resonant at the knock frequencies and a second diaphragm which is resonant at the knock frequencies. A noncompressible fluid is contained in the sealed double diaphragm structure between the two diaphragms. Pulsations of the second diaphragm, resonant at the knock frequencies, are detected by a magnetic device or a piezoelectric device operative to output an ac signal.
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