Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1980-03-10
1984-04-17
Martin, Jr., William D.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
33203, G01C 2500
Patent
active
044426968
ABSTRACT:
A fault detecting and automatic calibrating apparatus is provided for monitoring the position of a monitored apparatus. The calibrating apparatus detects errors and corrects the errors during its monitoring operation. In one embodiment, the monitored apparatus is a wheel alignment testing apparatus which checks a front wheel suspension system for proper alignment. The wheel aligner is simultaneously moveable about both a vertical axis and a horizontal axis. The movements of the wheel aligner are detected by transducers which provide angle signals corresponding to a toe angle and a camber angle of a wheel being tested. The calibrating apparatus checks the magnitude of the angle signals whenever a control circuit outputs a target pulse indicating that the toe angle or camber angle of the wheel is at predetermined angles. The predetermined angles are conveniently selected at zero degrees and a positive one degree. If the magnitude of the toe angle signal or camber angle signal does not correspond to a positive one degree toe or a positive one degree camber, upon occurrence of the target pulse, a visual indication is provided by the calibrating apparatus indicating that the apparatus is not properly calibrated. If the magnitude of the toe angle signal or camber angle signal does not correspond to zero degress toe or zero degrees camber, upon occurrence of the target pulse, the calibrating apparatus automatically recalibrates itself so that the angle signal is adjusted to correspond to the actual zero angle of the wheel.
REFERENCES:
patent: 2782626 (1957-02-01), Jochum et al.
patent: 3576124 (1971-04-01), O'Connor
patent: 3963352 (1976-06-01), Rishovd et al.
patent: 4204333 (1980-05-01), van Blerk
Erickson Lowell H.
Merrill Marcellus S.
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