JPS58211908A - Dew condensation and freezing eliminating means in air conditioning device for vehicle - Google Patents

Abstract

PURPOSE:To improve operability by deciding either dew condensation or freezing on the inside surface of a windshield according to signals from a dew condensation and freezing eliminating switch and automatically setting either dew condensation eliminating mode or freezing eliminating mode. CONSTITUTION:When a signal from a dew condensation and freezing eliminating switch 15 is inputted to a central processing unit 1, either dew condensation or freezing is decided in response to the signal ta from an outside air temperature sensor 4 according to a predetermined program. If dew condensation is decided, signal M1 from a demist mode setting circuit 12 is inputted to a selecting unit 5 and similarly if freezing is decided, signal M2 from a demist mode setting circuit 13 is inputted to the selecting unit 5. Further, when the possibility of freezing is decided in response to the inside air temperature, signal M3 from a defrost mode setting circuit 14 is inputted to the selecting unit 5. In dependence upon such signals M1-M3, respective control circuits 6-11 of a compressor, intake air switching door, mode switching door, air mix door, blower and rear heating wire are automatically controlled. With this constitution, operability may be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a removing device, and particularly to a device that automatically determines whether condensation or freezing occurs and removes the condensation.

Generally, when using an air conditioner to remove condensation or freezing on glass, you must operate the control section of the vehicle air conditioner to introduce outside air with low absolute humidity into the vehicle interior, or heat it toward the vehicle window. I try to blow the wind.

However, according to this method, it is extremely difficult to set the vehicle air conditioner to outside air intake mode and to set it to warm air blowing mode, and it is especially difficult to perform these operations while driving. -If done, it would significantly impair driving safety.

Also, when setting the mode to remove condensation, when the compressor is on all the time,
If a large amount of outside air is introduced, the air-conditioning condition inside the vehicle is impaired, which has the disadvantage of causing a deterioration of the passenger's feeling.

Therefore, we have provided a switch to set the vehicle air conditioner to condensation removal mode and a switch to set it to defrost mode, and when these switches are operated, the vehicle air conditioner automatically switches to condensation removal mode. It is conceivable to be able to set the defrost mode, but if multiple switches are provided in this way, it may be difficult to decide which switch to operate, making operation cumbersome.

The object of the present invention is to provide - condensation freeze removal switches;
Based on the signal from this switch, whether the condition of the inner surface of the window glass is dew condensation or freezing is automatically determined based on the outside air temperature and the inside air temperature, and the vehicle air conditioner is set to dew condensation removal mode or freeze removal mode. This method can be set automatically and eliminates the above-mentioned drawbacks, and will be explained in detail below using examples.

FIG. 1 is a block diagram showing an embodiment of the dew condensation and freezing removal device for a vehicle air conditioner according to the present invention. It consists of a setting signal TD from the temperature setting device 2, a signal tr from the inside air temperature sensor 3 that detects the temperature inside the vehicle, a % outside air temperature sensor 4
A selection device 5 for processing the empty signal ta
The compressor control circuit 6, the internal/external air cut door control circuit 7, the mode switching door control circuit 8, the air mix door control circuit 9, and the blower control circuit 10 are automatically controlled through the controller. That is, for example, when the set value of the temperature setting device 2 is set toward high temperature, the compressor control circuit 6 is controlled to reduce the operating rate of the compressor or stop the compressor in order to increase the temperature inside the vehicle. In addition, the internal/external air switching door is controlled to increase the ratio of outside air introduced, the mode switching door control circuit 8 is controlled so that warm air is blown out from the foot side, and the air mix door control circuit 9 to increase the mixing ratio of warm air, and
The blower control circuit 1o is controlled to set its rotation speed high. In addition, when the set value of the temperature setting device 2 is set toward low temperature, the compressor control circuit 6 is controlled to increase the operating rate of the compressor in order to lower the temperature inside the vehicle, and the inside/outside air switching door The control circuit 7 is controlled to increase the inside air introduction rate, the mode switching door control circuit 8 is controlled so that a large amount of cold air is blown out from the ventilated outlet side, and the air mix door control circuit 9 is controlled. is controlled to increase the mixing ratio of cold air, and further the blower control circuit 10 is controlled to set the rotation speed to a predetermined number. That is, the central processing unit 1 automatically controls each of the control circuits 6 to 10 according to the magnitude of the signals T D %tr, , ta to automatically control the air conditioning state in the vehicle interior. Hereinafter, such a control state will be referred to as an automatic control mode. Reference numeral 11 denotes a rear heating wire control circuit, which is controlled based on a signal inputted from the central processing unit 1 via the selection device 5. 1
2.13 is a demist mode setting circuit, which is controlled by the central processing unit 1 and receives mode setting signals M, .
M, is output to the selection device 5.

A defrost mode setting circuit 14 is controlled by the central processing unit 1 and outputs a mode setting signal M8 to the selection device 5. The selection device 5 sends these mode setting signals M1, M3 to the control circuits 6 to 10 and 1.
Selectively output to 1.

The central processing unit 1 includes a dew condensation freeze removal switch 15
It operates according to the flowchart shown in FIG. 2 based on the signals from . The dew condensation freeze removal switch 15 is
This switch is operated by a passenger when condensation occurs on the inner surface of the vehicle window glass or when freezing occurs on the outer surface. When this switch 15 is operated and turned on, the central processing unit 1 outputs the signal ta. The outside temperature is determined based on the Here, the outside temperature is, for example, the set temperature 7°C.
If the temperature is also high, the conditions are not such that freezing can occur at this time, so it is determined that condensation has occurred, the demist mode setting circuit 12 is controlled, and the demist mode setting circuit 12 outputs a mode setting signal. M1 is output. Here, the selection device 5 outputs the mode setting signal M1 to the compressor control circuit 6, the inside/outside air switching door control circuit 7, and the rear hot wire control circuit 11, thereby turning on the compressor and turning on the inside/outside air switching door. As shown in Figure 3, the outside air is
It is set to a mode that introduces However, the other control circuits 8.9.10 are set to automatic control mode. Therefore, since the inside air is dehumidified by the operation of the compressor and a portion of the outside air is introduced, the humidity inside the vehicle interior can be removed by the outside air with low absolute humidity, and the above-mentioned dew condensation can be removed. Can be done.

The central processing unit 1 determines the outside air temperature and, for example, if it determines that the set temperature is lower than 4 degrees Celsius, it can be determined that freezing has occurred due to condensation alone, so it next determines the inside air temperature. . If the inside air temperature is relatively high at 20° C., it is unlikely that the outer surface of the window glass is frozen.

That is, even if freezing occurs on the outside surface of the window glass, it can be determined that the window glass has been thawed due to the inside air temperature. Therefore, at this time, it can be determined that condensation has occurred, and the central processing unit 1 controls the demist mode setting circuit 13 to
3 outputs a mode setting signal M. Selection device 5
outputs this mode setting signal M to the inside/outside air switching door control circuit 7, the blower control circuit 10, and the rear heating wire control circuit 12, and thereby, as shown in FIG. If the mode is set to introduce 100 degrees of outside air, and the fan speed is kept low,
The speed is set to medium, and if the speed is medium, the rotational speed is increased to high speed, and the rear heating wire is energized. That is, when the outside air temperature is as low as 4 degrees Celsius or less, the vehicle air conditioner operates in heater mode, and at this time the compressor is turned off, thus producing a large amount of outside air with low absolute humidity. By introducing it into the water, condensation can be effectively removed.

Next, as a result of determining the inside air temperature, if the inside air temperature is as low as 15° C. or less, it can be determined that the outer surface of the window glass is frozen. That is, if the condensation/freezing removal switch is turned on under conditions where both the outside and inside air temperatures are low, it is determined that freezing has occurred, and the central processing unit 1
controls the defrost mode setting circuit 14. A mote setting signal M is output from the defrost mode setting circuit 14, and this mote setting signal M causes the internal/external air switching door control circuit 7, the mode switching door control circuit 8, the air mix door control circuit 9, the blower control circuit 10, The mode setting signal IVs is outputted to the rear hot wire control circuit 11, and this setting signal ■V1. As shown in FIG. 5, the blower is operated at high speed, the mode switching door is set to defrost mode, the air mix door is set to full heater mode, i.e., the mixing ratio of warm air is maximized, and The rear hot wire is energized. Further, the inside/outside air switching door may be set to the inside air switching mode. Therefore, warm air can be blown out at high speed toward the window glass, and the ice can be thawed.

In this case, the compressor is turned off.

Therefore, according to the above configuration, the central processing unit 1 determines the outside air temperature and the inside air temperature using the condensation freezing switch 15, and automatically sets the vehicle air conditioner to either the demist mode or the defrost mode. Therefore, setting operations for demist mode and defrost mode are not complicated as in the past, and since there is only one switch, operation is extremely easy, even those who are inexperienced in operation can easily use it. . In addition, in the demist mode setting when the compressor is turned on, only a small amount of outside air is introduced, so the air conditioning inside the vehicle is not affected.
There is no risk of degrading the feeling.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the dew condensation and freeze removal device for a vehicle air conditioner according to the present invention, and FIGS. 2 to 5 are diagrams for explaining the operation of the dew condensation and freeze removal device according to the present invention. This is a flowchart. 1...Central processing unit, 2...Temperature setting device, 3.
・・Inside air temperature sensor, 4゛・・Outside air temperature sensor, 5・
... Selection device, 6... Compressor control circuit, 7...
Inside/outside air switching door control circuit, 8...Mode switching door control circuit, 9...Air mix door control circuit, 10...Blower control circuit, 11...Rear heat ray control circuit, 12.13
... Demist mode 1: setting circuit, 14 ... Defrost mode setting circuit, 15 ... Condensation freeze removal switch. Patent applicant: Agent of Diesel Kiki Co., Ltd.
Patent Attorney Jun Miyazono - Figure 3 Figure 4 Figure 5

Claims (2)

[Claims] (1) Automatically control any or all of the compressor control means, the inside/outside air switching door control means, the mode switching door control means, the air mix door control means, and the blower control means based on the setting signal from the temperature setting device. In a vehicle air conditioner equipped with a control device, a demist mode setting means for controlling the inside/outside air switching door control means or the compressor control means, and a defrost mode for controlling the mode switching door control means and the air mix door control means. A setting means and a dew condensation freeze removal switch are provided, and the control device determines the outside air temperature when the dew condensation freeze removal switch is turned on and sets the demisting mode when the outside air temperature is higher than the set temperature. Drive the setting means to turn on the compressor or set it to outside air introduction mode, and when the outside air temperature is lower than the set temperature and the inside air temperature is higher than the set temperature, control the demist mode setting means to turn the compressor on. off, the outside air introduction mode is set, and when the outside air temperature is υ lower than the set temperature and the inside air temperature is lower than the set temperature, the defrost mode setting means is controlled to set the air blowing direction to the defrost mode, and the warm A dew condensation freezing device in a vehicle air conditioner, characterized in that it operates to increase the mixing ratio of air. (2) The demist mode setting means sets the outside air introduction amount to be smaller when the outside air temperature is higher than the set temperature than when the outside air temperature is lower than the set temperature. Dew condensation freeze removal device for vehicle air conditioners.