Rotational position detector having initial setting function

Details Rotational position detector having initial setting function Rotational position detector having initial setting function

1993-10-28

1996-07-30

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Displacement

32420725, 324174, 338324, 327511, G01B 730, G01R 3306, G01D 5245

Patent

active

055415067

ABSTRACT:
A rotational position detecting sensor such as a cylinder discriminating sensor, which is capable of detecting the rotational position of a rotor from immediately after the rotor starts to rotate as at an engine start, arranged such that when used as a cylinder discriminating sensor using a rotor for cylinder discrimination having a tooth formed around a semicircular portion thereof and a groove formed around another semicircular portion thereof, at an engine start, a binary output DO is set forcedly regardless of the positional relation between the rotor and the pick-up means, and then, if a difference Sn=Di-Dr as a result of comparison between the magnetic output Di resulting from rotation of the rotor and a reference value Dr is equal to and larger than 0, the difference most significant bit signal Sn(MSB) is set to "0", or if the difference Sn is less than 0, the Sn(MSB) is set to "1", and if the difference signal Sn is larger than a hysteresis width HYS, the binary output DO is set again, and when the signal is not inverted in the first setting again of this signal, a counter inverted signal -CT is output in a short artificial pulse, and if the signal is inverted, the binary output DO is output as the rotational position signal SO.

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