Motor vehicles – Bodies – Footboards and pedal guards
Patent
1976-02-12
1977-01-18
Goodman, Philip
Motor vehicles
Bodies
Footboards and pedal guards
250202, 250214AG, 318587, B62D 128
Patent
active
040034453
ABSTRACT:
Code circuitry for controlling the operation of a vehicle that is guided along a guide line by means of a vehicle guidance mechanism comprises a plurality of code markers positioned in a code marker path alongside the guide line, a sensor circuit that senses the intensity of radiation received from the guide line and code marker path and generates a code signal whenever the radiation from the code marker path increases to a predetermined proportion of the intensity of the radiation received from the guide line, and a control mechanism that controls the operation of the vehicle in response to code signals generated by the sensor circuit. A gain control feedback mechanism provides gain adjustment for wide variations in guide line and code marker intensity, and modulation circuitry eliminates the effect of static background radiation. A first delay circuit prevents transmission of a code signal unless the duration of the signal received by the sensor circuit is of a length to indicate the presence of a genuine code marker. A second delay circuit prevents transmission of the code signal until a predetermined interval after the first code marker is passed. The control mechanism stops the vehicle permanently if a second code marker signal is present when the second interval terminates. The control mechanism stops the vehicle temporarily and then automatically starts the vehicle again after a predetermined time period if no code marker signal is present after the second interval terminates. A line detection circuit prevents transmission of a code signal when the vehicle is not following the guide line.
REFERENCES:
patent: 2074251 (1937-03-01), Braun
patent: 2803743 (1957-08-01), Ballerait
patent: 2883559 (1959-04-01), Bailey
patent: 2996137 (1961-08-01), Chu
patent: 2996621 (1961-08-01), Barrett
patent: 2999938 (1961-09-01), Hann et al.
patent: 3017946 (1962-01-01), Davis
patent: 3527953 (1970-09-01), Chitayat
patent: 3718821 (1971-10-01), Vischulis
patent: 3744586 (1973-07-01), Leinauer
Goodman Philip
Lear Siegler, Inc.
Siemens Terrance L.
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