Communications: electrical – Selective – Having indication or alarm
Patent
1981-08-25
1984-02-07
Trafton, David L.
Communications: electrical
Selective
Having indication or alarm
340 52D, 340641, 340687, B60Q 100
Patent
active
044306377
ABSTRACT:
To provide an indication of the presence of a trailer connected to a vehicle, operating as a tractor, without any additional terminal or contact elements on a plug-socket connector between the electrical system of the tractor and the trailer connected thereto, a logic gate (11), preferably a NAND-element, is connected to the output line of the direction flasher circuit, or other suitable connecting line, to a low-resistance load on the trailer, for example the brake light (19a), position lights or the like, the resistance circuit element including a connection from the positive power supply through a resistor (12) having a value which is high with respect to that of the lamps on the trailer (19, 19a) so that, with the trailer disconnected, an effectively 1-signal will be applied to the logic circuit but, upon connection of a low-resistance lamp, that is, upon connection of a trailer socket, the signal at the logic gate will drop to a O-signal although the current through the lamp is insufficient to cause lighting thereof. Energization of the respective flasher lamps, which is only short-time, may cause flashing of the indicator which can be suppressed, for example, by inclusion of an R/C circuit in the control system for the indicator lamp.
REFERENCES:
patent: 3660813 (1972-05-01), Rumpf
patent: 3697974 (1972-10-01), Harris et al.
patent: 4127855 (1978-11-01), Toner
Junginger Erich
Koch-Ducker Heinz-Jurgen
Schnaibel Eberhard
Robert & Bosch GmbH
Trafton David L.
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