| 摘要 |
A daytime running light circuit is integrated with the existing headlight circuit of an automotive vehicle. The daytime running light circuit functions to automatically illuminate the headlights at reduced intensity when the vehicle is running and the headlight switch is turned off. Any time, however, that the headlight switch is turned on, the headlights are illuminated at full intensity. The daytime running light circuit comprises a day relay and a night relay. The night relay is responsive to the headlight switch being turned on for preventing operation of the daytime relay which would otherwise illuminate the headlamps at reduced intensity if the vehicle were running and the headlight switch off. When the headlight switch is off, the night relay enables the day relay to be operated whenever the vehicle is running. Indication that the vehicle is running is obtained from the alternator "R" terminal. The alternator "R" terminal signal may be further conditioned by sensing the status of one or more devices on the vehicle, such as the parking brakes or transmission, so that the day relay is operated by the alternator "R" terminal voltage signal only if all these one or more other devices indicate that the vehicle is not incapable of motion.
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