JPS58174017A - Remover for cloud of window glass for vehicle - Google Patents

Abstract

PURPOSE:To lighten a burden on operation of a driver, and to ensure the safety of operation by working an air conditioner for the car by either of a plurality of switches and removing the cloud of the window glass for the car. CONSTITUTION:The air conditioner for the car has control apparatus, such as a magnet clutch 8 for controlling a compressor, a blower 10 for introducing the inside and outside air, an inside and outside air changeover door 12, a mode changeover door 14, an air mixing door 16, etc. A demist control section 7 is operated when either of a demist switch 5, a wiper operating switch 4 or a switch 1 for controlling a rear hot wire is operated, the magnet clutch 8 is controlled and the compressor is worked when the temperature of the outside air is higher than set temperature, and air dehumidified is blown off to the air conditioner. When said temperature is lower that set one, on the contrary, the inside and outside air changeover door 12 is set at an outside air introducing mode, the air mixing door 16 is set at a heating mode, hot air is blown off to the air conditioner for the car, and the cloud of the window glass is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for removing fog from a vehicle window, and more particularly to a device for removing fog from a vehicle air conditioner by operating one of a plurality of switches.

Generally, when the weather is rainy, snowy, etc., the relative humidity near the inner surface of the window glass increases, making it easier for the inner surface of the window glass to become foggy. Therefore, the passenger turns on the wiper switch to remove water droplets from the window glass surface, and also controls various control devices of the vehicle air conditioning system, such as the blower air mix door, inside/outside air switching door, mode switching door, etc. The demisting operation is performed by individually operating a plurality of operating units.

However, this method has the disadvantage that not only the wiper operating switch but also each operating section of the vehicle air conditioner must be operated, making the operation cumbersome.

In addition, when the driver turns on the rear heating wire control switch that controls the energization of the rear heating wire installed in the rear window while driving and energizes it to remove fog that has formed on the rear window, it is natural that the vehicle Fogging often occurs on the inner surface of the windshield, so the passenger must turn on the rear heat ray control switch and then operate each operating section of the vehicle air conditioner to perform the demisting operation as described above. become. However, in this case as well, operating both the rear heat ray control switch and each operation section of the vehicle air conditioner is characterized by the complicated labor involved, especially when operating each operation section of the vehicle air conditioner. It is not easy to determine which operating section should be operated and to what degree in order to perform the demisting operation, and if this operation is performed during driving, the safety of driving will be significantly impaired.

An object of the present invention is to provide a demist switch in order to automatically perform a demist operation in a vehicle air conditioner, and when either the demist switch, the wiper operation switch, or the rear hot wire control switch is turned on, The above-mentioned drawbacks are eliminated by setting the vehicle air conditioner to the demist mode to effectively clear the fog on the inner surface of the window glass, and will be described in detail below using examples.

FIG. 1 is a block diagram showing an embodiment of the vehicle window glass defogging device according to the present invention. In the figure, 1 is a rear heating wire control switch, and when this switch is turned on, the rear heating wire energizing circuit 2 is turned on. It operates and energizes the rear hot wire 3. 4 is a wiper operation switch, and when this switch is turned on, a wiper control circuit 35 is activated and a wiper drive motor 36 is controlled. Normally, the control circuit 35 includes a switch circuit for controlling the rotation speed of the motor 36. 5 is a demist switch. The output signals of each of the switches 1, 4, and 5 are input to each input side of a NAND circuit 6, and the output signal of this NAND circuit 6 is supplied to a demist control section 7.

The ramist control unit 7 is composed of, for example, a microconbeater, etc., which includes a drive circuit 9 for the magnetic clutch 8 that controls the operation of the compressor, and a drive circuit 11 that controls the blower 10 for introducing the inside and outside air. It controls a drive circuit 13 that controls the switching door 12, a drive circuit 15 that controls the mode switching door 14, a drive circuit that controls the air mix door 16, and the like. The operation of the demisting control section 7 controls the compressor, the blower 10, the inside/outside air switching door 12, the mode switching door 14, the air mix door 16, etc., so that the vehicle air conditioner can perform the demisting operation. The drive circuits 9, 11, 13, 15, and 17 that control each control device of the vehicle air conditioner 18 are controlled by the vehicle air conditioner control device 19, and this control device 19 is connected to a control panel. By individually operating a plurality of operation parts 21 provided in 20, each operation part 2
Based on the signal output from 1, the compressor and blower 10. The inside/outside air switching door 12 and the like can be individually controlled. The demist control section 7 is controlled based on an output signal from an outside air temperature comparison/determination circuit 22. When the outside temperature is, for example, 5℃ or higher after comparing multiple certified standard values, 0
It detects and determines when the temperature is below ℃, when it is below -2℃, and when it is 0℃ or above, and outputs this judgment result to the demist control section 7, which then makes this judgment. Based on the results above drive circuit 9.11.13.15%
17 etc.

The operation of the demist control section 7 will be explained using the flowchart shown in FIG. Since the output of the circuit 6 becomes H level, the demist control section 7 causes the vehicle air conditioner 18 to perform the demist operation based on this signal. In this case, if the rear heating wire control switch 1 is turned on, the electric heating wire 3 is energized by the energizing circuit 2, and if the rear heating wire control switch 4 is turned on, the rear heating wire control circuit 35 is activated. Then, the wiper is driven. Here, the outside air temperature comparison/determination circuit 22 judges the outside air temperature.
℃ or higher, the demist control unit 7 excites the magnetic clutch 8 to operate the compressor, and the blower 1
00 rotation speed is set to high speed, the opening degree of the air mix door 16 is set to slightly heater mode, that is, the mixing ratio of warm air is slightly increased, and the inside/outside air switching door is set to inside air introduction mode.

As a result, the vehicle air conditioner 18 dehumidifies the air by cooling it with the evaporator after introducing the air into the vehicle interior, and also puts the air mix door into a slight heater mode to prevent the air temperature from decreasing due to the cooling by the evaporator. The demisting operation A is performed by compensating for this and blowing out the air dehumidified in this way into the vehicle interior at high speed. This demisting operation A gradually dehumidifies the inside air, so that the fog on the inner surface of the window glass is removed. Here, the NAND circuit 6 also outputs an H level output signal to perform the demisting operation A. The timer 30 measures the elapsed time of this demisting operation A, and this time reaches a preset time When the timing signal P is reached, the timer 30 outputs a clock signal P to the demist control unit 7, and the demist control unit 7 sets the blower to a low speed of 100 revolutions in the above operation A based on this clock signal P, and controls the internal/external air switching door 12. The demisting capacity of the vehicle air conditioner 18 is somewhat reduced by setting the outside air introduction rate to 30%. By reducing the demisting capacity in this way,
It is possible to prevent the air conditioning condition inside the vehicle from being disturbed by the demisting operation. Also, the outside air temperature comparison judgment circuit 22
When it is determined that the outside air temperature is below 0° C., the demist control unit 7 rotates the blower 10 at high speed and moves the air mix door 16 to the full heater mode (maximum heating mode) or to a certain heating mode position, The mode switching door 14 is set to defrost mode, and the inside/outside air switching door 12 is set to the defrost mode.
is set to the outside air introduction mode, and the demisting operation B-((() is performed. In other words, in this case, the compressor is not driven to protect the compressor from low temperatures. Based on the demisting operation B of the vehicle air conditioner 18, Dry outside air is heated inside the room by the heater core and then blown out at high speed, and this air is blown against the inner surface of the window, so it is possible to clear the fog that has formed on the inner surface of the window glass. When the set time elapses after operation B is performed, the timer 30 outputs a timing signal P, and based on this, the following control is performed.In other words, the outside air temperature comparison and judgment circuit 22 determines whether the outside air temperature is below 12 degrees Celsius or 0 degrees Celsius. If the outside temperature is 0°C or higher, the rotation speed of the blower 10 is set to medium speed, and the mode switching door 14 is set to a medium speed.
is set to a mode in which air is blown out from both the foot outlet and the defrost outlet of the vehicle air conditioner 18. In addition, when the outside temperature is extremely low, below 12 degrees Celsius, it is assumed that the fog on the inside of the window glass will not clear easily, and warm air is blown into the passenger compartment at high speed without reducing the rotation speed of the fan. and maintain demisting operation B.

Therefore, according to the present invention, when the rear heating wire control switch 1 is turned on, for example, the rear heating wire 3 is energized and the vehicle air conditioner 18 can be caused to perform the demisting operation A or B. It is possible to prevent fogging from occurring on the inner surface of the windshield, and it is possible to save the trouble of individually setting the operation section 21 of the operation panel 20 of the vehicle air conditioner. In addition, even when the wiper operating switch 4 is turned on, the vehicle air conditioner 18 can be caused to perform the demisting operation, so that it is possible to prevent dust from occurring on the inner surface of the window glass. The demisting operation can be performed automatically just by turning on the demisting switch 5, and the operation panel 20
By individually operating the operation parts 21 of the controller, it is possible to solve the problem of impeding operational safety, and since the compressor is controlled according to the outside temperature, the compressor can be protected and save money. It is possible to make it motorized. Furthermore, after the vehicle air conditioner 18 performs the demisting operation for a set time period, its demisting capacity is reduced, thereby eliminating the drawback that the air conditioning condition is impaired due to the demisting operation of the vehicle air conditioner 18. You can.

As explained above, the vehicle glass defogging device according to the present invention includes a magnetic clutch for controlling a compressor, a blower for introducing inside and outside air, an inside and outside air switching door, a mode switching door, and an air mix door. Controls the drive circuit that controls each of the above-mentioned control devices of the vehicle air conditioner when any of the vehicle air conditioner, demist switch, wiper operation switch, and rear heat ray control switch is operated. It is composed of a demist control section that causes the air conditioner to perform a demist operation, and an outside air temperature comparison/determination circuit that determines the outside air temperature #AJ and controls the demist control section. Based on the judgment signal output from the outside air temperature comparison circuit when the outside air temperature is higher, the compressor is operated, the blower is rotated at high speed, and the inside/outside air switching door is set to inside air introduction mode.
When the outside air temperature is lower than the set temperature, the rotation speed of the blower is increased based on the signal output from the outside air temperature comparison/judgment circuit 75, the air mix door is moved to the full heating mode or to a heating direction to some extent, and the mode switching door is turned on. It is configured to operate in defrost mode and the inside/outside air switching door to operate in outside air introduction mode. As it is possible to prevent fogging from occurring on the inner surface of the window glass, it is possible to reduce the operational burden on the occupants to remove fogging from the window glass, and to improve driving efficiency. Safety can be ensured.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the vehicle window glass defogging device according to the present invention, and FIG. 2 is a flowchart for explaining its operation. 1 Rear hot wire control switch, 2... energizing circuit, 3...
・・Rear hot wire, 4・・Waino Kuichi activation switch, 5・・
- Demist switch, 6 - NAND circuit, 7 - Demist control unit, 8 - Magnetic clutch, 10 - Blower, 12 - Inside/outside air switching door, 14 - Mode switching door, 16... Air mix door, 11, 13. 15.
17... Drive circuit, 19 Control device, 20... Operation panel. 21...Operation unit, 35...Wino (-control circuit, 36
...Wiper drive motor. Patent applicant: Agent of Diesel Kiki Co., Ltd.
Patent attorney Jun Miyazono −

Claims (3)

[Claims] (1) From a vehicle air conditioner that has control equipment such as a magnetic clutch that controls the operation of the compressor, a blower for introducing inside and outside air, an inside and outside air switching door, a blowout mode switching door, an air mix door, etc., and a sensor that detects outside air temperature. an outside air temperature comparison/judgment circuit that compares the signal with a set value and outputs a judgment result, and a detection means that detects whether any of the rear heat wire control switch, the wiper operation switch, and the demist setting switch is turned on. The above-mentioned magnetic clutch is controlled by the output signal of the above-mentioned outside air temperature comparison/judgment circuit which is operated based on the output of this detection means and is output when the outside air temperature is higher than the set temperature, and the compressor is operated to operate the air conditioner for a vehicle. performs a blowing operation of dehumidified air, and sets the inside/outside air switching door to an outside air introduction mode according to the output signal of the outside air temperature comparison/judgment circuit that is output when the outside air temperature is lower than the set temperature, and sets the air mix door to an outside air introduction mode. A vehicle window glass defogging device comprising a demist control section that causes a vehicle air conditioner to perform a warm air blowing operation in a heating mode. (2) The vehicle window glass defogging device according to claim 1, wherein the demist control section sets the blower to a high rotational speed based on an output signal from the switch operation detection means. (3) The demist control unit sets the mode switching door to the defrost mode when causing the vehicle air conditioner to perform the warm air blowing operation. .