Gear tooth position and speed sensor with four, bridge circuit c

Details Gear tooth position and speed sensor with four, bridge circuit c Gear tooth position and speed sensor with four, bridge circuit c

1982-07-15

1985-03-19

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

324174, 324252, G01R 3306, G01B 730, G01P 344

Patent

active

045062170

ABSTRACT:
To simplify a field plate effect speed and position sensor, particularly for association with the starter gear of an automotive-type internal combustion engine, four meander-arranged permalloy resistance tracks are located on a substrate at the corners of a rectangle, spaced, in circumferential direction, by about half the pitch distance of the teeth (2) of the starter gear. The resistances can be connected in a voltage divider (FIG. 4) configuration, or in form of a bridge circuit (FIG. 5) supplied from a constant current source (CC) to eliminate temperature variation affects, and providing alternating current output voltages within the wide range of temperature of essentially uniform level as the teeth (2) scan the sensor, a special marker tooth (10) providing an output signal of different level. Preferably, the resistances (5-8) are formed as meander-shaped thin film vapor deposited tracks on a silicon substrate (4), a permanent magnet (9) providing bias magnetization, the direction of which changes with respect to the orientation of the meander tracks--preferably 45.degree. with respect to the direction of rotation (11) to cause the resistance elements to either have high, or low resistances (FIG. 3).

REFERENCES:
patent: 3846697 (1974-11-01), Cila et al.
patent: 3917997 (1975-11-01), Sidor
patent: 4039936 (1977-08-01), Jones et al.
patent: 4280165 (1981-07-01), Pospelov et al.
patent: 4401944 (1983-08-01), Narimatsu et al.

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