Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1993-12-17
1995-10-17
O'Shea, Sandra L.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
324160, G01F 3489
Patent
active
054593980
ABSTRACT:
An adaptive threshold circuit for use with a magnetic type of sensor that has a pick-up coil. The pick-up coil has an alternating voltage induced therein when a slot formed in a wheel rotates past the sensor. The circuit produces a square wave pulse voltage during positive half-cycles of the voltage generated in the pick-up coil. The circuit includes a digital to analog converter the input of which is connected to a pulse counter. The output of the converter is a function of the count magnitude in the counter and provides a variable threshold voltage that is compared by a voltage comparator with a voltage that is a function of the magnitude of the voltage generated in the pick-up coil. The circuit has an input circuit connected to the pick-up coil that includes a voltage attenuating circuit and a diode. The pulse count of the counter is, at times, incremented under control of a comparator that compares the output voltage of the converter with a voltage that is a function of the magnitude of the voltage generated in the pick-up coil.
REFERENCES:
patent: 3801830 (1974-04-01), Boyer
patent: 4293814 (1981-10-01), Boyer
patent: 4866298 (1989-09-01), Kniss et al.
patent: 4868498 (1989-09-01), Lusinchi et al.
patent: 4962470 (1990-10-01), Hansen
patent: 5012207 (1991-04-01), Edwards
patent: 5015878 (1991-05-01), Lasagna et al.
patent: 5015949 (1991-05-01), Koch et al.
patent: 5029286 (1991-07-01), Kirschner
patent: 5101155 (1992-03-01), Oehler et al.
patent: 5144233 (1992-09-01), Christenson et al.
patent: 5274326 (1993-12-01), Bleckmann et al.
David K. Long, "An Adaptive Sense Amplifier For Engine Control Applications", Paper No. 770435, Society of Automotive Engineers International Automotive Engineering Congress and Exposition, Cobo Hall, Detroit, Michigan Feb. 28-Mar. 4, 1977.
Allison Roger D.
Cook Thomas D.
Hansen Mark C.
Kosiak Walter K.
Delco Electronics Corporation
Funke Jimmy L.
O'Shea Sandra L.
Phillips Roger
LandOfFree
Adaptive threshold circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adaptive threshold circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive threshold circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-600036