Anti-frost system for motor vehicle windshield utilizing saturat

Details Anti-frost system for motor vehicle windshield utilizing saturat Anti-frost system for motor vehicle windshield utilizing saturat

1989-10-24

1991-10-15

Reynolds, Bruce A.

Electric heating

Heating devices

Combined with diverse-type art device

219522, 52171, 307 101, H05B 102, B60L 102

Patent

active

050576666

ABSTRACT:
An anti-frost system for the windshield of a motor vehicle has a heating element incorporated in the windshield. The system has an atmospheric temperature sensor, a relative humidity sensor and a windshield temperature sensor. Signals from the atmospheric temperature sensor and the relative humidity sensor are inputted to a calculator circuit which calculates a saturated steam temperature from the input signals. The saturated steam temperature and the windshield temperature are delivered to an operation circuit, which determines that frosting on the windshield is expected under a combined condition to the windshield temperature and the saturated steam temperature and which turns a transistor on to close a switch to energize the heating element for preventing frosting in advance.

REFERENCES:
patent: 3434347 (1969-03-01), Lockwood
patent: 3934111 (1976-01-01), Roselli et al.
patent: 4902874 (1990-02-01), Tachimori et al.

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