Knock detecting apparatus for internal combustion engines

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

1980-08-15

1983-01-04

Gill, James J.

Measuring and testing

Engine detonation

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

73651, G01L 2322

Patent

active

043667023

ABSTRACT:
A magnetic path is formed by a vibrating member disposed in a housing in the radial direction and fixed at its end to the housing, a central magnetic path portion which is disposed to make a gap between the vibrating member and the central magnetic portion and to extend in the axial direction of the housing substantially at its center, a radial magnetic path portion extending from the central magnetic path portion in the radial direction of the housing with a predetermined spacing kept from the vibrating member, and an outer peripheral magnetic path portion extending from the outer peripheral side of the radial magnetic path portion toward the vibrating member. A permanent magnet for supplying magnetic flux to the magnetic path is disposed at the central magnetic path portion in the form of bar or at the outer peripheral magnetic path portion in the form of ring or to surround the central magnetic path portion. The outer peripheral magnetic path portion may be magnetically shielded by housing made of a magnetic material. The vibrating member and the central magnetic path portion may be assembled beforehand to be an integral structure.

REFERENCES:
patent: 2275675 (1942-03-01), Draper et al.
patent: 2319219 (1943-05-01), Draper et al.
patent: 2424864 (1947-07-01), Treseder
patent: 2643869 (1953-06-01), Clark
patent: 3281743 (1966-10-01), Anderson
patent: 3943390 (1976-03-01), Ochiai
patent: 4275586 (1981-06-01), Gast et al.

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