Tractor work lighting with automatic deluminizing control

摘要

Tractor with speed-responsive circuit-interrupting switch for automatically dousing, at night, flood work lamps provided in a lighting circuit on the tractor. Switching is controlled according to a microcomputer chip program by which frequency of a ground speed transducer is compared with the speed limit speeds pre-assigned to an intermediate tractor speed range; thus deluminizing occurs, necessarily on the highest side, at one speed commonly associated with highway rate of travel whereas, on the lower side, the switching effective to reconnect and relight the lamps is at a materially different desired speed of the tractor.