Automatic demisting system for front windshield inner surface of automobile

Abstract

The invention aims at providing an automatic demisting system for a front windshield inner surface of an automobile. The system aims at improving automobile comfortableness and safety. The system comprises a control unit connected with a power supply circuit, an automobile ignition signal detection circuit, a fan control circuit, an air conditioner control circuit, a front windshield inner surface humidity detection circuit and an automobile inside and outside temperature detection circuit. The control unit detects ignition time of an engine through the automobile ignition signal detection circuit. When the automobile inside and outside temperature detection circuit detects that temperature difference between the inside and the outside of the automobile exceeds a preset value and the front windshield inner surface humidity detection circuit detects that the front windshield inner surface humidity exceeds the preset humidity, the control unit changes an automobile inside ventilation mode into outer circulation and utilizes the fan control circuit to control a fan to conduct demisting if the ignition time of the engine exceeds the preset time length, otherwise, the control unit changes the automobile inside ventilation mode into inner circulation and utilizes the air conditioner control circuit to control an air conditioner to conduct demisting.

Description

technical field [0001] The invention relates to the technical field of defogging of automobiles, in particular to an automatic defogging system for the inner surface of a front windshield of an automobile. Background technique [0002] Fog on the front windshield of a car is a phenomenon of "liquefaction" from a physical point of view. When there is a lot of rain and the air is relatively humid, if the external temperature is low, a temperature difference will be formed inside and outside the cab, and the humid air in the cab will condense when it hits the windshield, forming a layer of mist or frost. High humidity and temperature difference are the two conditions for the formation of fog, so fog is more likely to be formed in rainy weather in spring and autumn. [0003] Fog on the front windshield will affect the driver's sight. When the driver does not understand the road conditions ahead, the danger is self-evident. Some drivers find that after fogging, they will wipe ...

AI Technical Summary

Problems solved by technology

[0003] Fog on the front windshield will affect the driver's sight. When the driver does not understand the road conditions ahead, the danger is self-evident

Some drivers will wipe off the water vapor on the windshield while driving after discovering the fog. This operation is also very dangerous. If there is an emergency on the road, it will be too late to deal with it and cause an accident.

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