JPH0316856A - Ice melting device for vehicle - Google Patents

Abstract

PURPOSE:To forcibly discharge ice, started to melt, in a short time by a method wherein the temperatures of a wiper and a glass surface are detected, and when temperature is increased to a given value, the wiper is actuated for a specified time. CONSTITUTION:Through operation of an ice melt switch 6, an exciting coil 8 is energized by a controller 17. and a clear conductive film stretched on glass 1 is energized through a switch 5. Simultaneously, a temperature sensor 10 is charged with a current, a voltage between terminals is increased in proportion to the temperature of the glass 1, and compared with a reference voltage. The reference voltage is set to temperature at which ice is started to melt on a contact surface with the glass 1. Thus, when a voltage between terminals is increased to a potential responding to a set temperature, a time circuit is started, and only during a time set at a timer circuit, a window wiper device 9 is actuated. Since ice started to melt is forcibly removed, a waiting time till ice melting can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application in Business A) The present invention relates to an ice melting device for a vehicle that drives a wiper for a certain period of time when melting ice on a glass surface of a vehicle.

(Prior art) As a means of melting ice on the glass surface of a normal vehicle,
Heating wires have been used for a long time, but in recent years transparent conductive films that can be melted at high speed and can be applied to vehicle windshields and rear windows have been used.

FIG. 4 is a circuit diagram of a system for removing ice adhering to the ice-melting glass 1 of this type. A normal electric device 2 is supplied with power from a battery 3, and a charging circuit is formed from an AC generator 4 via a switch 5. When the ice melting switch 6 is operated, the excitation coil 8 is energized by the controller 7, so that the switch 5 is switched to the ice melting glass side, and a predetermined high voltage is applied to its electrode. Become.

(Problem to be Solved by the Invention) In such a conventional system, it is possible to apply electricity from the AC generator 4 to the transparent conductive film provided on the glass 1 and melt the ice within a few minutes after applying the voltage. This is possible and functions as an effective system, especially in cold regions.

However, in reality, the heat generated by the conductive film is proportional to the applied voltage, and as shown in FIG. The ice at the four corners of the glass surface begins to melt, and within 3 to 4 minutes, the ice at the center, indicated by the shaded area in the figure, melts. However, the ice was not removed from the glass surface until 5 to 7 minutes, and the ice was not removed from the glass surface until 3 to 7 minutes.
After 4 minutes, most of the ice in contact with the glass surface has melted, but after another 3 to 4 minutes, the melted ice begins to slide off the glass surface, interfering with driving. There was a problem with being exposed.

The present invention was made to solve the above problems, and
To provide an ice melting device for a vehicle that reduces waiting time for melting ice by forcibly removing ice that has started to melt using a wiper.

(Means for Solving the Problems) According to the present invention, in a vehicle ice melting device that melts ice on a glass surface of a vehicle using an energizing heating means, a temperature detection means for detecting the temperature of a wiper and the glass surface; It is possible to provide an ice melting device for a vehicle, which includes wiper control means that detects that the temperature reaches a predetermined value and operates the wiper for a predetermined period of time.

(Function) In the vehicle ice melting device of the invention, the wiper control means grasps the relationship between the melting direction of the ice and the temperature of the glass surface, and operates the wiper for a certain period of time after a certain period of time depending on the glass temperature. did.

(Example) Hereinafter, an example of the wooden invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an example of the ice melting device of the present invention. Components that are the same as those of the conventional system shown in FIG. 4 are given the same reference numerals. The ice-melting crow 1 is provided with a window wiper device 9 for wiping off rain and snow that has fallen on its surface, and a glass temperature sensor 10. When the transparent conductive film provided on the glass 1 is energized, the controller 17, which energizes the excitation coil 8 by operating the ice melting switch 6, is supplied with power from the battery 3 via the ignition switch 12, and the temperature sensor 10 is used for temperature detection. When the temperature of the glass surface rises to a certain level, the window wiper device 9 is automatically operated to forcibly remove ice from the glass surface.

FIG. 2 is a circuit diagram showing the connection relationship between the controller 17 and the window wiper device M9. Note that only the configuration of the controller 7 necessary for explaining the present invention is illustrated.

As the temperature sensor 10, for example, a Vosistor, a PT thermocouple, a thermistor, or the like having a resistance value characteristic of positive or negative with respect to the temperature of the windshield is used. One end of this temperature sensor 10 is grounded, and the other end is connected to a constant voltage circuit 71 via a resistor R1.
is connected to.

Reference numeral 72 denotes a comparator, the positive input terminal of which is connected to the temperature sensor, and the other negative input terminal connected to the connection point between the resistor R2 and the variable resistor R3, thereby supplying a reference voltage. The output end of the converter 72 is connected to a timer circuit 73, and the transistor 74 is turned on for a time set by the timer circuit 73. Between the constant voltage circuit 71 and the collector of the transistor 74,
A relay coil 75 is provided, and when the transistor 74 is turned on, current flows through the relay coil and the relay switch 7
6 is switched from the wiper switch 13 side to the ground side.

The wiper switch 13 has an off position 13a and a low speed position M.
1 3 b, configured to be switchable to high speed position 13 c,
Further, the windshield wiper device 9 has its B terminal connected to the positive electrode of the battery 3, and its P terminal connected to the off position 13a of the wiper switch 13, and the L terminal connected to the off position 13a and low speed position 13b via the relay switch 76, respectively. and the H terminal is connected to the high speed position 13c. Reference numeral 91 is a motor of the wiper device, and reference numeral 92 is a contact point for operating this motor intermittently.

The operation of the vehicle ice melting device having the above configuration will be explained next.

When the ice melting switch 6 is operated, the excitation coil 8 is energized by the controller 17, and the transparent conductive film provided on the glass 1 is energized via the switch 5. At the same time, a current flows through the temperature sensor 10 from the constant voltage source of the controller 17 via the resistor R1. The voltage across the terminals of the temperature sensor 10 increases in direct proportion to the temperature of the glass, and is compared with a reference voltage by a comparator 72. This reference voltage is applied to the 7 grades of ice melting on the contact surface of glass 1.
For example, it is set to O''C.In other words, when the voltage between the terminals of the temperature sensor 1o rises to the potential corresponding to 0°C,
The output of comparator 72 activates timer circuit 73, which turns on transistor 74 for a set period of time. As a result, current flows through the relay coil 75,
Relay switch 76 is switched to the ground side.

FIG. 3 is a graph showing the relationship between the elapsed time after the ice melting switch 6 is turned on, the glass surface temperature, and the ice melting area.

After 3 minutes, when the glass surface temperature reaches o'c (3rd
In the figure a), the L terminal of the window wiper device 9 is grounded via the relay switch 76, and even if the wiper motor 91 has the four wiper switch 13 in the off position 13a,
A predetermined current flows from the battery 3 through the terminal B to drive the wiper. In other words, in the conventional glass ice melting system, the rise was gradual as shown by curve C in the figure, but
Since the wiper motor is automatically driven based on the glass temperature after a few minutes, the ice that begins to melt almost instantaneously is forcibly removed, as shown by curve b in the figure.

As above, this invention has been described in some detail with respect to its most preferred embodiment, but the description of the preferred embodiment does not include variations in detailed parts of the configuration or contrary to the spirit of the invention as described in the claims. It is clear that various modifications or combinations thereof may be made.

(Effects of the Invention) As explained above, according to the present invention, by automatically driving the wiper for a certain period of time, the ice melting area of the ice melting glass is expanded in a short time, and a special high voltage is used. without any
It is possible to provide an ice melting device for a vehicle that can shorten a driver's waiting time for ice melting.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the ice melting device of the present invention;
FIG. 2 is a circuit configuration diagram showing the connection relationship between the controller 17 and the window wiper device 9, and FIG. 3 shows the elapsed time after turning on the ice melting switch 6, the glass surface temperature, and the ice melting area. FIG. 4 is a circuit configuration diagram of a conventional ice removal system, and FIG. 5 is a diagram showing ice melting glass that utilizes heat generated by a conductive film. 1...Ice melting glass, 9...Window wiper device,
10... Glass temperature sensor, 13... Wiper switch, 17... Controller.

Claims (1)

[Claims] A vehicle ice melting device that melts ice on the glass surface of a vehicle by means of energized heating means includes a wiper and a temperature detection means for detecting the temperature of the glass surface, and a temperature detection means for detecting the temperature of the wiper and the glass surface, and a temperature detection means for detecting that the temperature reaches a predetermined value, An ice melting device for a vehicle, comprising: wiper control means for operating the wiper for a predetermined period of time.