Automatic windscreen defogger

Details Automatic windscreen defogger Automatic windscreen defogger

1986-05-20

1988-04-12

Salce, Patrick R.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

733365, 219203, 356448, G01D 534

Patent

active

047376295

ABSTRACT:
A control system for discriminating the occurrence of fogging of the windscreen of a vehicle due to the deposition of water drops or the like from the degree of optical scattering and automatically starting and stopping the operation of a defogging apparatus according to the result of the discrimination. To prevent the defogging apparatus from being stopped undesirably due to an optical system being subjected to the effect of a disturbance light, the disturbance light is detected so that when the disturbance light exceeds a predetermined value, the defogging apparatus is maintained in operation.

REFERENCES:
patent: 3926052 (1975-12-01), Bechtel
patent: 3947131 (1976-03-01), Karl
patent: 4355271 (1982-10-01), Noack
patent: 4538064 (1985-08-01), Kovacs
patent: 4636643 (1987-01-01), Nakamura et al.
patent: 4636698 (1987-01-01), Leclercq

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