Method and device for automatically switching on and off the hea

Details Method and device for automatically switching on and off the hea Method and device for automatically switching on and off the hea

1986-04-21

1987-05-19

Dixon, Harold

Electric lamp and discharge devices: systems

Special application

Vehicle

307 10LS, 315 77, 340641, 340 79, B60Q 102

Patent

active

046671293

ABSTRACT:
In a motor vehicle comprising headlights, an ignition switch, and an electric energy storage battery, there is provided a device for automatically turning on and off the headlights. A first and a second comparators responsive to two different reference voltages and to the voltage V present between the terminals of the battery determine whether the voltage V has an amplitude located within a predetermined range of voltage amplitudes. An electronic switch interposed between the battery and the headlights is controlled by the outputs of the first and second comparators to turn the headlights on when the amplitude of the voltage V is located within the predetermined range, and to turn the headlights off when the voltage V is outside of this range. The device is connected to the battery so that it operates only when the ignition switch is closed. The device is also connected in parallel with the normal, manually operated lighting switch so as to allow normal operation of the headlights through the latter switch.

REFERENCES:
patent: 2648801 (1953-08-01), Hall
patent: 3262011 (1966-07-01), Cones
patent: 3341736 (1967-09-01), Fortney
patent: 3369147 (1968-02-01), Ramsey
patent: 3402321 (1968-09-01), Tagawa
patent: 3474296 (1969-10-01), Rickey
patent: 3702415 (1972-11-01), Schultz
patent: 3706006 (1972-12-01), Miller
patent: 3774071 (1973-11-01), Goodrich
patent: 3832597 (1974-08-01), Mitchell
patent: 3876904 (1975-04-01), Weber
patent: 4337400 (1982-06-01), Hahn

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