Method of calibrating and zeroing stepper motor gauges

Details Method of calibrating and zeroing stepper motor gauges Method of calibrating and zeroing stepper motor gauges

1996-08-09

1997-09-09

Noland, Thomas P.

Measuring and testing

Instrument proving or calibrating

318490, G01D 1800

Patent

active

056658974

ABSTRACT:
A rotary gauge driven by a stepper motor has a stop near the zero point of the gauge graphics. A factory calibration procedure rotates the gauge field in reverse direction to move the gauge pointer against the stop and continues field rotation until the rotor becomes unstable and flips back in the forward direction, and then moved to a rotor rest position. The angle of flip back, the rest position and the number of steps to the zero position are stored in non-volatile memory. In the vehicle, when the ignition is off, the microprocessor or the stepper motor wakes periodically and exercises the gauge, using the stored values to reset the gauge to the stable position. When ignition is turned on, the microprocessor moves the gauge directly to the zero position.

REFERENCES:
patent: 3823265 (1974-07-01), Ludwig et al.
patent: 3896363 (1975-07-01), Kinsel et al.
patent: 4315328 (1982-02-01), Schwab
patent: 4330739 (1982-05-01), Chiang
patent: 4487065 (1984-12-01), Carlin et al.
patent: 4535405 (1985-08-01), Hill et al.
patent: 5247655 (1993-09-01), Khan et al.

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