Control system for a vehicle window defogger and de-icer

Details Control system for a vehicle window defogger and de-icer Control system for a vehicle window defogger and de-icer

H - Electricity

05

B

H05B 3/84 (2006.01)

Patent

CA 2079175

ABSTRACT OF THE DISCLOSURE A windshield heater control system employs a thermistor to obtain a measure of the temperature of window glass of a vehicle. This measured value is translated to digital form by the analog-to-digital converter in a microcontroller. The digital value is then compared with a sequence of threshold level values stored in the read only memory of the microcontroller in order retrieve a corresponding count value from which a duration count value indicative of a heating interval duration is derived. The duration count value is loaded into a programmable count-down timer in the microprocessor which times the desired interval. A power switch connects the vehicle's electrical supply to a resistive heating element formed as an integral part of the window for the heating interval. The functional relationship between the initial temperature sensed by the thermistor and the duration of the resulting heating interval is predetermined and is characterized by a marked increase in the heating interval duration when the sensed initial temperature is in the vicinity of zero degrees centigrade. -19-

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