JPS5934961A - Hot wire system for blur resisting of window glass - Google Patents

Abstract

PURPOSE:To eliminate useless consumption of electric power by sending an electric current corresponding to a blur and frost to a hot wire, by providing an electric current controlling device provided with an atmospheric temperature sensor and humidity sensor. CONSTITUTION:A hot wire 5 for blur resisting of window glass to be operated by an ignition switch 3, an operation switch 4 and an electric current controlling device 9 eliminates an inside blur and outside frost of the window glass. The electric current control device 9 is provided with a thermistor 7 of an atmospheric temperature sensor and a humidity sensor 8, and the lower the atmospheric temperature is and the higher humidity is, the higher it electrifies. With this construction, useless electric power consumption is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat ray system for defogging a windshield that eliminates wasteful power consumption due to the heat ray for defogging a windshield.

Many modern passenger cars are equipped with a heat ray system for defogging the windshield. Figure 1 shows a conventional hot wire system for windshield defogging, where l is a battery, 2 is a hinge pull link, 3 is an ignition switch, 4 is a hot wire switch for windshield protection, and 5 is for windshield defogging. heat ray,
6 is an indicator lamp. When the heat wire switch 4 for anti-fog windshield is turned on, the indicator run 16 starts.
When the window glass antifogging hot wire 5 is turned on, electricity is applied to the windshield antifogging hot wire 5, and the heat generated by the windshield antifogging hot wire 5 removes fogging from the glass and at the same time melts the frost attached to the outer surface of the glass.

In such a heat ray system for windshield defogging, a constant current always flows when the windshield antifogging heat ray switch 4 is turned on, but the fogging of the window and the amount of frost that adheres to it are Since the current varies depending on the outside temperature and humidity, if a constant current is constantly passed through the windshield anti-fog hot wire, if there is little fog or frost on the outside, it will waste power and drain the battery. This may cause unnecessary fuel consumption.

The present invention has been made in view of the above points, and in order to eliminate wasteful power consumption by the windshield antifogging heat wire, the current flowing through the windshield antifogging heat wire is controlled according to the outside temperature and humidity. This is how it was done.

The present invention will be explained below based on the drawings.

FIG. 2 shows an embodiment of the hot wire system for defogging a windshield according to the present invention, and the same reference numerals in FIG. 1 as in FIG. 1 indicate the same components. In other words, l is a battery, 2 is a fusible link, 3 is an ignition switch f, 4 is a hot wire switch for windshield defogging, 5 is a hot wire for windshield defogging, 6 is an indicator rung, and 7 is a thermistor that measures the outside temperature. Its resistance value changes in response to the change in . 8 is a humidity sensor whose resistance value changes according to changes in humidity; 69 is a control for controlling the current value recorded on the windshield antifogging hot wire 5 based on the resistance value change of the thermistor and humidity sensor 8; It is a unit.

Now, in the windshield defogging hot wire system having the above configuration, when the windshield defogging agent vI wire switch 4 is turned on, a current flows through the windshield defogging hot wire 5, and the heat generated by the windshield defogging hot wire 5 generates heat. To remove the fog from the window glass and at the same time melt the frost attached to the outer surface of the window glass. In general, the amount of fog on a window glass and the amount of 1.6 adhering to the outside surface of the glass increase as the outside temperature is lower and as the humidity is higher. The resistance of the thermistor 7 increases as the temperature decreases, and the resistance of the humidity sensor 8 decreases as the humidity increases, so the thermistor 7 and humidity sensor 8 detect the external temperature and humidity, The detection signal is input to the control unit 9, and the current flowing through the windshield antifogging hot wire 5 is controlled to an optimum value. For example, as shown by the dotted line, a humidity sensor 8 and a thermistor 7
are connected in series between the power supply and ground, and the current is controlled according to the intermediate potential. In other words, the lower the outside temperature and the higher the humidity, the greater the current flowing through the windshield antifogging heat wire.
"Control the current value so that

In this way, the optimum current flows through the windshield anti-fogging hot wire according to the outside temperature and humidity, that is, the degree of fogging of the glass and the amount of boxes attached to the glass surface, so there is no wasted power consumption. Therefore, wasteful fuel consumption can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a conventional hot wire system for defogging a windshield, and FIG. 2 is a circuit diagram of a hot wire system for defogging a windshield according to the present invention. l...Battery-b3...Ignition switch, 4...Windshield anti-fogging heat wire switch. 5... Windshield anti-fog heat wire, 6... Indicator rung, 7... Thermistor, 8... Humidity sensor, 9... ° control unit. Patent Applicant Nissan Motor Co., Ltd. Agent Patent Attorney Hiroshi Suzuki 28: Figure 1 Figure 2-2)

Claims (1)

[Claims] A windshield defogging device comprising an outside temperature sensor, a humidity sensor, and a tiL flow control means for controlling a current flowing through a windshield defogging heat wire based on the outputs of the outside temperature sensor and humidity sensor. hot wire system.