Self calibrating lighting control system

Details Self calibrating lighting control system Self calibrating lighting control system

1993-06-01

1995-01-10

Pascal, Robert J.

Electric lamp and discharge devices: systems

Special application

Vehicle

315 82, 3151693, 315308, 315314, 307 108, 36457101, B60Q 700

Patent

active

053810740

ABSTRACT:
A lighting control system with self calibration for employing the entire physical travelling range of a dimmer switch. A lookup table and linear interpolation are used in conjunction with the voltage output of the dimmer switch in order to identify the appropriate duty cycle of a Pulse Width Modulated signal which drives the lamps in the system. Two of the values in the lookup table are default minimum and maximum values of voltage which can be expected from a worst case switch device. The system dynamically determines and stores any new maximum or minimum voltage which is received from the dimmer switch. These dynamically determined minimum and maximum values are used to replace the default values in the lookup table thus calibrating the lookup table. The calibrated lookup will take into account the operating parameters of the actual switch in the vehicle and will therefore always produce a corresponding change in illumination intensity over the entire physical range of the dimmer switch.

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