Phase sensitive guidance sensor for wire-following vehicles

Details Phase sensitive guidance sensor for wire-following vehicles Phase sensitive guidance sensor for wire-following vehicles

1981-10-30

1984-09-18

Groody, James J.

Communications: electrical

External condition vehicle-mounted indicator or alarm

Highway information

180168, 318587, 340988, G08G 109, B60K 3100

Patent

active

044727160

ABSTRACT:
A guidance sensor for a wire-following vehicle which is phase sensitive, includes an array of coils (C1-C16) positioned to sense the vertical component of a magnetic field (17) produced by the AC current through the guidance wire 15. The outputs of the coils are fed to associated flip flops (FF1-FF16). Flip flops associated with coils, through which flux passes in one direction, e.g. up, are driven to one state, e.g. true, and flip flops associated with coils through which flux passes in the opposite direction, e.g. down, are driven to a false state. The control signal to guide the vehicle to be over the wire is a function of the number of flip flops in the true state. Circuitry (45, 46) is included to prevent flip flops from assuming a wrong state due to noise.

REFERENCES:
patent: Re30492 (1981-01-01), Blakeslee
patent: 3154946 (1964-11-01), Ordorica
patent: 3612206 (1971-10-01), Ohntrup
patent: 3893090 (1975-07-01), Neuner
patent: 3993156 (1976-11-01), Rubel
patent: 4079803 (1978-03-01), Takada et al.
patent: 4083422 (1978-04-01), Blakeslee
patent: 4172551 (1979-10-01), Johnson
patent: 4307329 (1981-12-01), Taylor
patent: 4361202 (1982-11-01), Minovitch
Proceedings of the IEEE, vol. 61, No. 12, Olson, pp. 1764-1765, Dec. 1977.
IEEE Transactions on Vehicular Technology, Olson, vol. VT-26, No. 2, May 1977, pp. 161-172.
IEEE Transactions on Automatic Control, Fenton, vol. AC-21, No. 3, Jun. 1976, pp. 306-315.

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