Knock detecting apparatus for internal combustion engine

Details Knock detecting apparatus for internal combustion engine Knock detecting apparatus for internal combustion engine

1979-11-19

1981-09-22

Gill, James J.

Measuring and testing

Engine detonation

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

73651, G01L 2322

Patent

active

042903017

ABSTRACT:
A knock detecting apparatus for an internal combustion engine includes a vibrating reed of magnetic material. One end of the vibrating reed is fastened to a supporting member interposing therebetween a magnet and one end of a core. The free end of the vibrating reed confronts with the other end of the core with an air gap therebetween to form a magnetic path including the magnet, vibrating reed, air gap and core. As the vibrating reed vibrates in response to vibration of the engine on which the supporting member is securely mounted, the distance of the air gap changes causing a change in magnetic flux passing through the magnetic path. The change of magnetic flux is detected by a coil wound on the core. The resonance characteristic of the vibrating reed is arranged to fall in the frequency range of the knocking.

REFERENCES:
patent: 1907415 (1933-05-01), Carpenter et al.
patent: 1948104 (1934-02-01), Firestone et al.
patent: 2424864 (1947-07-01), Treseder
patent: 4161665 (1979-07-01), Buck et al.

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