Knock detecting apparatus for internal combustion engines

Details Knock detecting apparatus for internal combustion engines Knock detecting apparatus for internal combustion engines

1982-03-03

1984-07-31

Goldberg, Gerald

Measuring and testing

Engine detonation

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

73658, 73706, 73728, 73DIG4, 310338, G01L 2322

Patent

active

044622473

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.

REFERENCES:
patent: 2532620 (1950-12-01), Higgs
patent: 2569987 (1951-10-01), Frondel
patent: 4299117 (1981-11-01), Andrews et al.
patent: 4366702 (1983-01-01), Yamaguchi et al.

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