Abb Ab

Asea Brown Boveri Ab

Anders Eidenvall

Sten Linder

Lennart Thegel

A method, system and inductive device for accurately determining inclination of a shaft arranged with a gear wheel including a plurality of gear teeth. The inductive measuring device includes a transmitter coil and at least two receiving coils arranged adjacent relative an axis of symmetry of the transmitter coil. Voltages in the receiving coils are measured, summed and integrated. A zero value for the integral is used to determine the position of the center line of the gear tooth. The invention may be used for diagnostic and/or control purposes of an internal combustion engine.

Method and device for determining the angular inclination of a shaft in a rotating machine

A device for carrying out measurements of a quantity through measuring the influence upon a magnetic field generated through a basic signal in a region of measurement ( ) has a first member ( ) adapted to change the polarity of the basic signal in a regular way on the basis of the length of the time for regularly repeating the basic signal, or a multiple thereof, and a second member ( ) adapted to change the polarity of a detection signal in connection with the treatment of this detection signal synchronizedly with the polarity change of the first member.

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Västerås, Sweden

Anders Eidenvall