JPH071288Y2 - Vehicle air conditioning controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a vehicle air-conditioning control device, and more particularly to a vehicle air-conditioning system capable of preventing fog on the inner surface of a window glass when the outside air temperature is below a predetermined value and the inside air is in circulation. Regarding the control device.

(Prior Art) Conventionally, as such a vehicle air conditioning control device, when the outside air temperature is below a predetermined value and the inside air is in a circulating state, air conditioners such as a blowout mode switching door, a blower motor, a mix door, etc. The applicant of the present invention has proposed a technique for controlling the inner surface of the window glass of a room to prevent fogging (for example, Japanese Patent Application No. 62-237935).

(Problems to be solved by the invention) Generally, when the outside air temperature is low and the inside air is circulating, the inside surface of the window glass tends to become cloudy. However, even when the outside temperature is the same, the inside temperature of the window glass differs between low speed running and high speed running. for,
The cloudiness is different. That is, when the vehicle runs at high speed, the degree of decrease in the temperature of the inner surface of the window glass is larger than that when the vehicle travels at a low speed, and tends to be lower than the dew point temperature.

However, the above-mentioned conventional technology has a configuration in which the air conditioning equipment is controlled in the demist direction with the same demist capacity even when the vehicle speed is different, and in such a conventional technology, when designed for low speed traveling, it is sufficient for high speed traveling. It is not possible to prevent fogging, and conversely, if designed for high speed running, the fogging prevention control during low speed running will be excessively performed, so it is not possible to always obtain a stable haze prevention effect, If the anti-fogging control is excessively performed, the interior of the vehicle may become too hot and the temperature control may be impaired.

The present invention has been made by paying attention to such a conventional problem. By changing the demist ability according to the vehicle speed, it is possible to always obtain a stable haze prevention effect at any vehicle speed. At the same time, it is an object of the present invention to provide a vehicle air conditioning control device that does not impair the temperature control in the vehicle interior.

(Means for Solving the Problem) In order to achieve such an object, the vehicle air conditioning control device according to the present invention is configured such that when the outside air temperature is equal to or lower than a predetermined value and the inside air is in a circulating state, the air conditioning device is used as a window glass of the passenger compartment. In a vehicle air conditioning control device having a control means for controlling in the demist direction for removing cloudy weather, a vehicle speed detecting means for detecting a vehicle speed and outputting it to the control means is provided, and the control means is detected by the vehicle speed detecting means. The air-conditioning equipment is configured to be controlled in such a direction as to increase the demist ability as the vehicle speed value is increased.

(Operation) In the vehicle air-conditioning control device, the control means controls the air-conditioning device so as to increase the demist capability as the vehicle speed increases.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a vehicle air conditioning control device according to a first embodiment of the present invention. As shown in the figure, the vehicle air-conditioning control device controls the low-temperature demist control means 1 (in a demist direction for removing the fog on the window glass of the passenger compartment) when the outside air temperature is below a predetermined value and the inside air is in circulation. Control means).

At each input terminal of the low temperature demist control means 1, the outside air temperature signal from the outside air temperature detecting means 2 including an outside air sensor for detecting the outside air temperature, and the inside / outside air switching door being switched to the inside air circulation position side are detected. The inside air circulation state (REC state) detection signal from the REC state detection means 3 that outputs the signal and the vehicle speed signal from the vehicle speed detection means 4 that detects the vehicle speed are input. Control signals are output from the output terminals of the low-temperature demist control means 1 to the mode actuator 5, the resistance switching relay or power transistor 6 and the mix door and the actuator 7, respectively, and the mode actuator 5, the resistance switching relay or power transistor 6 are output. The blowout mode switching door 8, the blower motor 9, and the mix door 10, which are air conditioners, are respectively controlled by the mix door actuator 7. That is, the switching position of the blowout mode switching door 8, the rotation speed of the blower motor 9, and the rotation position of the mix door 10 are controlled.

Next, the operation of the first embodiment will be described with reference to the flowcharts of FIGS. 2 (a) and 2 (b).

First, the low temperature demist control means 1 determines in step 201 of FIG. 2 (a) whether the outside air temperature signal from the outside air temperature detection means 2 is less than or equal to a predetermined value, and if the answer is affirmative (Yes). To proceed to step 202, REC from the REC status detection means 3
Based on the state detection signal, it is determined whether the inside / outside air switching door is in the inside air circulation state at the inside air circulation position side. If the answer is affirmative (Yes), the process proceeds to step 203 to execute the low temperature demist control. . Step when the outside air temperature signal is above the specified value
When the answer to 201 is negative (No), or when the inside / outside air switching door is on the outside air introducing position side and the answer to Step 202 is negative (No), the routine proceeds to Step 204, and the normal control is executed. In this normal control, the compressor, the blowout mode switching door 8, the blower motor 9, and the mix door are selected according to the heat load.
10 are controlled respectively.

As the low temperature demist control in step 203, the low temperature demist control subroutine shown in FIG. 2B is executed.

First, the low-temperature demist control means 1 detects the vehicle speed from the vehicle speed signal output from the vehicle speed detection means 4 in step 205, determines the control method of each of the air conditioners according to the detected vehicle speed, and controls this control. Control each air conditioner based on the method.

This control is executed as follows.

First, as shown in FIG. 3, the blowout mode switching door 8 is in the blowout mode of the differential / foot 1 in which the ratio of the amount of air blown from the foot outlet is large when the vehicle runs at a low speed up to about 20 km / h. When the vehicle travels at a high speed of about 50 km / h, the differential / foot 1 is controlled to the differential / foot 2 blowing mode in which the ratio of the amount of air blown from the defroster outlet is large. Therefore, the amount of air blown toward the inner surface of the window glass at the time of high-speed traveling is larger than that at the time of low-speed traveling, whereby the demist ability is further enhanced.

The air volume of the blower motor 9 is
At the time of low-speed running of up to about 20km / h is M _L (medium-low), when the vehicle speed is at high speeds of about 50km / h,
It is controlled from M _L to M _H (medium high), which has a larger air volume than M _L. Therefore, when running at high speed, warm air blows out toward the inner surface of the window glass at a higher speed than when running at low speed,
This also enhances the demist ability.

As shown in FIG. 5, the opening speed of the mix door 10 depends on the vehicle speed.
At low speeds up to about 20km / h, the hot air is in the hot position where it blows into the passenger compartment. At high speeds when the vehicle speed is around 50km / h, the hottest position blows the warmest hot air into the passenger compartment. Controlled by. Therefore, the temperature of the warm air blown toward the inner surface of the window glass during high-speed traveling is higher than that during low-speed traveling, which also enhances the demist ability.

In the above embodiment, as the vehicle speed increases, the blower air volume is increased and the blowout temperature is increased in order to enhance the demist capability, and thus the vehicle interior temperature tends to increase, but the vehicle speed is low when the outside temperature is low. When the temperature rises, the amount of outside air entering the vehicle interior increases and the heat in the vehicle interior is transferred to the cool air that contacts the vehicle exterior surface, so the vehicle interior temperature rises to a level that poses a practical problem. Absent.

In the above embodiment, when the vehicle is traveling at a high speed, the low temperature demist control means 1 controls all of the blowout mode switching door 8, the blower motor 9 and the mix door 10 so as to enhance the demist ability, and thereby the inner surface of the window glass is controlled. Although clouding prevention or cloud clearing is effectively performed, this low temperature demist control may be controlled so as to increase at least one of the blowout mode switching door 8, the blower motor 9 and the mix door 10. .

Next, a second embodiment of the present invention will be described with reference to FIGS. 6 to 7.

In the second embodiment, the demisting force is controlled in accordance with the vehicle speed in the first embodiment, but in consideration of the fact that the inner surface of the window glass is cooled differently even if the vehicle speed is the same and the outside air temperature is different, the vehicle speed is different. And, the demist force is controlled according to the outside temperature.

The structure of the second embodiment is the same as that of the first embodiment shown in FIG. 1, but the operation of the low temperature demist control means 1 is different from that of the first embodiment.

Next, the operation of the second embodiment will be described based on the flowcharts of FIGS. 6 (a) and 6 (b). Note that step 601 in the flowchart of FIGS. 6 (a) and 6 (b)
2 to 605 are the same as steps 201 to 205 shown in FIGS. 2A and 2B, the description thereof will be omitted.

In the flowchart of FIG. 6 (b) showing the low temperature demist control subroutine, the low temperature demist control means 1 detects the outside air temperature based on the outside air temperature signal from the outside air temperature detecting means 2 in step 606, and detects it in step 607. The control method of each air conditioner is determined according to the vehicle speed and the outside air temperature, and each air conditioner is controlled based on this control method.

First, as shown in FIG. 7, the blowout mode switching door 8 is controlled between the blowout mode of the differential / foot 1 and the blowout mode of the differential / foot 2 by a value obtained by combining the vehicle speed and the outside air temperature. . That is, when the combined value of the vehicle speed and the outside temperature is in the region below the line A indicating the differential / foot 1, the blowout mode switching door 8 is in the differential / foot 1 blowout mode, and the combined value is In the area above the line B indicating the differential / foot 2, the blowing mode switching door 8 is controlled to be in the blowing mode of the differential / foot 2, and in the area between the line A and the line B, As the combined value increases, the proportion of the amount of air blown out from the defroster outlet is controlled to increase.
Therefore, the larger the combined value of the vehicle speed and the outside temperature is, the more the amount of air blown toward the inner surface of the window glass is increased, and thereby the demist ability is further enhanced.

The air volume of the blower motor 9 is controlled between _ML and _MH by the value which combined the vehicle speed and the outside temperature, as shown in FIG. That is, the vehicle speed and when the outside air temperature and a value obtained by combining a is in the region below the line C showing the M _L, the air volume becomes M _L of the blower motor 9, above the line D indicating the combined value M _H , The air volume is controlled to be M _H, and in the area between the line C and the line D, the air volume is controlled to increase as the combined value increases. Therefore, the larger the combined value of the vehicle speed and the outside temperature, the larger the amount of warm air blown toward the inner surface of the window glass, which also enhances the demist ability.

As shown in FIG. 9, the opening degree of the mix door 10 is controlled between the hot position and the full hot position by the combination of the vehicle speed and the outside air temperature. That is, when the combined value of the vehicle speed and the outside temperature is in the area below the line E indicating the hot position, the hot position is obtained, and when the combined value is above the line F indicating the full hot position. Is controlled so as to be in the full hot position, and in the area between the line E and the line F, it is controlled so as to change from the hot position to the full hot position side as the combined value increases.
Therefore, the larger the combined value of the vehicle speed and the outside air temperature is, the higher the temperature of the warm air blown toward the inner surface of the window glass is. This also enhances the demist ability.

Thus, in this second embodiment, the blowout mode switching door 8, the blower motor 9, and the mix door 10 are shown in FIGS. 7, 8 and 9 stored in the low temperature demist control means 1. Control is performed based on the blowout mode, the blower air volume, and the map of the mix door opening.

According to the second embodiment, the demist force is controlled according to the vehicle speed and the outside air temperature, so that the inner surface of the window glass can be more effectively prevented from being fogged and clear than the first embodiment. be able to.

(Effects of the Invention) As described above in detail, according to the vehicle air conditioning control device of the present invention, the demist that removes the cloudiness of the window glass of the vehicle interior by the air conditioner when the outside air temperature is a predetermined value or less and the inside air is in a circulating state. In a vehicular air-conditioning control device having a control means for controlling a direction, a vehicle speed detecting means for detecting a vehicle speed and outputting the detected vehicle speed to the control means is provided, and the vehicle speed value detected by the vehicle speed detecting means is large. By controlling the air conditioning equipment to increase the demist ability, the control means controls the air conditioning equipment to increase the demist ability when the vehicle speed is high, so that it is always stable at any vehicle speed. It is possible to obtain the anti-fogging effect and
It does not damage the temperature control inside the vehicle.

[Brief description of drawings]

1 to 5 show a first embodiment of the present invention, and FIG. 1 is a schematic configuration diagram of a vehicle air conditioning controller, FIG. 2 (a),
FIG. 2B is a flowchart for explaining the operation of the low temperature demist control means, FIG. 2B shows the low temperature demist control subroutine of FIG. 2A, and FIG. A graph, FIG. 4 is a graph showing control of the blower air flow, FIG. 5 is a graph showing control of the mix door opening, and FIGS. 6 to 9 show a second embodiment of the present invention.
FIGS. 6 (a) and 6 (b) are flowcharts for explaining the operation of the low temperature demist control means, and FIG.
FIG. 7 is a map showing a low temperature demist control subroutine of FIG. 7A, FIG. 7 is a map showing control of a blowout mode, FIG. 8 is a map showing control of blower air volume, and FIG. 9 is a map showing mix door opening. . 1 ... Low temperature demist control means (control means), 5 ... Vehicle speed detection means, 8 ... Blowout mode switching door (air conditioner),
9: Blower motor (air conditioner), 10: Mix door (air conditioner).

Claims (1)

[Scope of utility model registration request] 1. A vehicle air-conditioning control device comprising a control means for controlling an air-conditioning device in a demist direction for removing fog on a window glass of a vehicle compartment when the outside air temperature is below a predetermined value and is in an internal air circulation state. Then, a vehicle speed detecting means for outputting to the control means is provided, and the control means is configured to control the air conditioner in a direction to increase the demist ability as the vehicle speed value detected by the vehicle speed detecting means increases. A vehicle air conditioning control device.