Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1974-07-16
1976-07-20
La Roche, Eugene
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250214AG, 250214B, 318577, G05B 101
Patent
active
039708403
ABSTRACT:
A vehicle guidance mechanism for guiding a vehicle along a guide line comprises a radiation source that causes the guide line to reflect or emit a guidance signal; photocell sensors mounted in the vehicle and adapted to sense the guidance signal and produce an error output signal proportional to the variation of vehicle position from a predetermined lateral position with respect to the guide line; and a control device in the vehicle adapted to steer the vehicle in response to the error signal so as to cause the vehicle to follow the guide line. An automatic contrast or gain control circuit eliminates the effect of background illumination in the output signal received from the guide line. Modulation circuitry and appropriate filters reduce the effects of static background illumination and improve the reliability and line detecting ability of the guide system. Line detection circuitry is employed to prevent operation of the automatic control device unless the vehicle is tracking a valid guide line.
REFERENCES:
patent: 2996621 (1961-08-01), Barrett, Jr.
patent: 3718821 (1973-02-01), Vishulis
patent: 3739177 (1973-06-01), Ko
La Roche Eugene
Lear Siegler, Inc.
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