Electricity: measuring and testing – Magnetic – Displacement
Patent
1997-03-07
1999-03-30
Strecker, Gerard
Electricity: measuring and testing
Magnetic
Displacement
123617, 32420725, G01B 730, G01D 518
Patent
active
058894004
ABSTRACT:
A sensor used to detect an opening angle of, for example, a throttle valve comprising: a pivotable valve axle arranged so as to be pivoted through a pivoted angle; a magnet; a first magnetic circuit, through which a first magnetic flux branched from a total magnetic flux developed from the magnet is passed; a second magnetic circuit, through which a second magnetic flux branched from the total magnetic flux developed from the magnet is passed; a pair of first and second Hall effect devices, the first Hall effect device being interposed in the first magnetic circuit so as to output a first signal according to the first magnetic flux passing therethrough and the second Hall effect device being interposed in the second magnetic circuit so as to output a second signal according to the second magnetic flux passing therethrough; and a calculation circuit, in response to the first and second signals of the first and second Hall effect devices, for calculating a level of a detection signal (So1, So2) of the sensor from the first and second signals outputted from the first and second Hall effect devices and for outputting the detection signal, the level of the detection signal being linearly varied according to the pivoted angle of the valve axle.
REFERENCES:
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patent: 3530317 (1970-09-01), Lang
patent: 5164668 (1992-11-01), Alfors
patent: 5350043 (1994-09-01), Crewson et al.
patent: 5462026 (1995-10-01), Kumagai
patent: 5627465 (1997-05-01), Alfors et al.
patent: 5811968 (1998-09-01), Nakazawa et al.
patent: 5823165 (1998-10-01), Sato et al.
Strecker Gerard
Unisia Jecs Corporation
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