US 6,150,639 AGranted

Anti-freezing system, anti-froster for windshield and rear window of motor vehicles

OwnerYing Chao Ruan, Jing Qing Tanginventors

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Abstract

An automatic, dynamic window anti freezing system for the windshield and the rear window of a motor vehicles parked in cold weather, connected to a battery, comprises a temperature range control-switch unit, an optic frost-monitor, and a sweeping time (frequency)- control to drive a wiper system to work for preventing frost accumulating on the window glass. The temperature unit sets up a certain working range to turn on the system, covering the real freezing stage of the windows. The sweeping time control sets up predetermined sweeping timely manner for the wipers to sweep. The monitor emits light signals to monitor the frost accumulating on the window glass, and actuates the sweeping control to drive wipers to sweep it off when detecting it. The energy consumption is generally exceptional low due to that working is effectively controlled and easily done. Thus a related window is substantially able to avoid freezing on. The present invention has a subsystem consisted of the monitor and the sweeping control for automatically wiping fog and rain during driving. It is realized by using an appropriate switch to separate it from the temperature unit.

Claims5

Dependent claims

An optically monitored and freezing-temperature handled anti freezing system for preventing frost from accumulating on a window of a parked motor vehicle having a battery and a wiper system of a predetermined number of appropriate wiper units, said system having an optically monitored sub-system for wiping fog and rain, comprising:

an optic window monitor for monitoring certain substances accumulating on the glass of said window to produce an output signal when detecting said substances, having a monitoring head and a related monitor circuits, said substances including snow, frost, fag, and rain,
a temperature range control switch unit for providing an electrically short way passing through it when the temperatures sensed by said temperature unit fall into a certain range between a predetermined higher temperature limit and a predetermined lower temperature limit, corresponding to the freezing temperature range of said window, within said freezing range freezing may occur on said window glass,
a sweeping time control for providing predetermined sweeping timely manner signals, handling means responsive to said sweeping manner signals for operating said wipers, connecting means for sending said output signal from said monitor to actuate said sweeping time control,
switch means for either connecting said monitor to said temperature range unit for realizing said anti freezing system, or connecting said monitor to said battery for realizing said sub-window system, comprising a combination electric switch of said both connecting ways,
source-switch means for connecting said temperature unit to said battery.

2 more elements

Dependencies are inferred from the claim text.