Automobile headlight warning alarm system

Details Automobile headlight warning alarm system Automobile headlight warning alarm system

1991-07-11

1992-06-23

Ng, Jin F.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340457, B60Q 1100

Patent

active

051246848

ABSTRACT:
The headlight warning apparatus is a device which alerts the driver of an automobile that the lighting circuit is energized while the engine is not running. By detecting the ripple voltage produced by the alternator, the apparatus determines whether the engine is on or off. Using this detection scheme, no calibration is required. To facilitate ease of installation in connecting the headlight warning apparatus to the lighting circuits, the headlight warning apparatus can be connected to the lighting circuit without having to determine the voltage polarity present in the lighting circuit. The installation is further simplified as making a connection to the ignition circuit is not required.

REFERENCES:
patent: 3391302 (1968-07-01), Weingarden
patent: 4125824 (1978-11-01), McPherson et al.
patent: 4194175 (1980-03-01), Eklund
patent: 4862140 (1989-08-01), Case et al.

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