Apparatus for sensing a failed position and velocity sensor

Details Apparatus for sensing a failed position and velocity sensor Apparatus for sensing a failed position and velocity sensor

1987-12-08

1989-09-05

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

340671, 318605, 324163, G08B 2100

Patent

active

048642843

ABSTRACT:
A self guided vehicle employs a highly accurate velocity sensor to determine vehicle speed and position. The velocity sensor includes a resolver connected to and rotatable with a ground engaging wheel. A resolver to digital converter (R/D) provides a highly accurate 8-bit digital signal representative of the angle of wheel rotation. A second less expensive and less accurate velocity sensor also receives the modulated sine and cosine signals from the resolver and produces a series of pulses representative of vehicle speed. The pulses are produced by detecting the zero crossings of the sine, cosine, and combinations of the sine and cosine signals. The velocity information present in the second velocity sensor signal is not used to actually guide the vehicle, but merely to generally validate the information present in the R/D signal.

REFERENCES:
patent: 3869019 (1975-03-01), Cardani
patent: 4121272 (1978-10-01), Wolfinger
patent: 4125825 (1978-11-01), Takeuchi et al.
patent: 4319333 (1982-05-01), Hedrick
patent: 4352050 (1982-09-01), Sakano
patent: 4358722 (1982-11-01), Iwakane et al.
patent: 4667114 (1987-05-01), Rossi
patent: 4740778 (1988-04-01), Harding et al.

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