Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1993-05-13
1995-06-06
Strecker, Gerard R.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
324174, 324500, 324537, 327511, G01P 344, G01P 3487, G08C 2500
Patent
active
054225680
ABSTRACT:
A road wheel speed sensor for use with an automotive vehicle supported on road wheels. A pulsating variation in magnetic flux is produced with rotation of one of the road wheels. A signal converter is provided for converting the pulsation magnetic flux variation into a rectangular pulse signal to switching a transistor on and off. The signal converter is connected through power and signal lines to a processor. The transistor has a base electrode for receipt of the rectangular pulse signal, an emitter electrode, and a collector electrode connected to the signal line. A first resistor is connected between the power line and the signal line. A second resistor is connected between the power line and the emitter electrode of the transistor. A third resistor is connected between the signal line and the ground. The processor calculates a speed of rotation of the road wheel in response to a voltage developed across the third resistor.
REFERENCES:
patent: 4518918 (1985-05-01), Avery
patent: 5218298 (1993-06-01), Vig
Hashizume Yoshikazu
Kuze Tadayuki
Strecker Gerard R.
Unisia Jecs Corporation
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