JPH0717185B2 - Automatic air conditioning controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an air conditioning control device for a vehicle.

[Prior Art] The windshield of an automobile has an outside air temperature and a vehicle interior temperature (hereinafter,
Called the inside temperature. ), The thermal conductivity of the windshield, the vehicle speed and the humidity inside the vehicle may cause fog. In order to automatically prevent the windshield from becoming fogged, control is performed by detecting the fog on the windshield using a humidity detector or fog detector, and supplying the air blown out from the air conditioning controller from the defroster outlet. (Hereinafter, also referred to as defroster mode). However, for example, if the air outlet is switched from the state in which the air outlet of the air conditioning control device is being supplied from the heater outlet (hereinafter also referred to as the heater mode) to be supplied from the defroster outlet,
Although the fog on the windshield is removed, there is a problem that the feet get cold and only the upper half of the body is warmed up, which makes passengers uncomfortable.To solve this problem, the amount of air discharged from the foot of the air conditioning controller and the amount of defroster air blown out. There was also a proposal to change the to linear. In addition, in order to prevent fogging of the windshield, an occupant turns on a cooling compressor to dehumidify the air, or the air used for air conditioning is circulated from the inside air (hereinafter also referred to as the inside air mode). In reality, switching to an outside air introduction state (hereinafter, also referred to as an outside air mode) is also used.

[Problems to be Solved by the Invention] The air-conditioning control device that linearly controls the foot blowout amount and the defroster blowout amount has an excellent effect of eliminating an unpleasant phenomenon in which the foot gets cold and only the upper body is warmed. I have.

However, when the air used for the air conditioning control device is supplied in the internal air mode, the windshield tends to become cloudy when the humidity in the vehicle compartment is high. In such a case, even if the air outlet is in the defroster mode, There was a problem that the visibility in front of the windshield could not be improved because it was not possible to remove the fogging on the windshield. It was also considered that this problem would be prominently manifested in that the area that was not directly exposed to the air blown out from the defroster remained cloudy. In such a case, it may be possible for an occupant to manually start the compressor for the purpose of dehumidification, but engine torque and fuel consumption may be reduced due to the load of the compressor, and it may be delayed due to manual operation. Cause problems,
It was hard to say that it was an effective solution.

Configuration of the Invention [Means for Solving the Problem] The configuration adopted by the automatic air conditioning control device of the present invention to solve the above problem is as illustrated in FIG. That is, the automatic air-conditioning control device of the present invention is an automatic air-conditioning control device installed in an air conditioner for a vehicle, and adjusts the ratio of the inside air inside the passenger compartment taken into the air conditioner and the outside air outside the passenger compartment. And a defroster adjusting means for adjusting the ratio of the amount of air blown toward the windshield through the defroster duct to the amount of air blown into the vehicle interior. And humidity control means for detecting the humidity in the vicinity of the windshield, and controlling the intake rate adjusting means to increase the intake rate of the outside air as the humidity increases.
The defroster adjusting means is controlled to control the defroster adjusting means so as to increase the blowing rate of the air-conditioning air from the defroster duct as the humidity increases.

Here, as the windshield, a windshield, a side glass, a rear glass and the like can be considered. The configuration of an automatic air-conditioning control device having a windshield defroster that occupies most of the driver's field of view is generally used, but an automatic air-conditioning control device having a rear defroster for the rear glass can be used.

The intake ratio adjusting means is, for example, an inside / outside air switching damper or the like which is installed at the duct inlet and whose opening can be adjusted in multiple steps or in steps, and adjusts the intake ratio of the inside air and the outside air.

The defroster adjusting means adjusts the rate of blowing the air conditioning air from the defroster duct.For example, the defroster adjusting means is installed in the vicinity of the outlet of the air conditioning air into the vehicle compartment to guide the air conditioning air to the defroster duct and to vent the air. This corresponds to a blower outlet switching damper, a fan for exclusive use of the defroster, or the like, which can be adjusted in multiple stages or steplessly by adjusting the amount to the mouth or heater outlet and the amount to the defroster duct.

The humidity detecting means detects the humidity in the vicinity of the windshield in the vehicle interior (hereinafter, simply referred to as the humidity in the vicinity of the windshield). For example, a humidity sensor that detects the humidity in the vicinity of the windshield corresponds to this. Further, since the humidity near the windshield and the degree of haze of the windshield have a close relationship, as the humidity detecting means, for example, a fog sensor for measuring the reflectance of the inner surface of the windshield or the windshield inner surface is installed. It is also possible to use a fog sensor that detects the degree of haze of the windshield from the resistance value between the transparent electrodes.

The ratio control means controls the opening ratio of the intake ratio adjusting means, for example, the inside / outside air switching damper to control the outside air intake ratio, and the defroster adjusting means, for example, the position of the outlet switching damper to control the defroster duct. For controlling the blowout ratio of the air-conditioning air, controlling the intake ratio adjusting means so as to increase the intake ratio of outside air as the humidity near the windshield increases, and the defroster as the humidity increases. The defroster adjusting means is controlled so as to increase the rate of air-conditioning air blown out from the duct.

The humidity detecting means and the rate controlling means may each have a discrete circuit configuration, or they may be separately or integrally configured as a logical operation circuit using a microcomputer to realize the function of each means by a program. It may be configured to.

[Operation] Since the automatic air conditioning control device of the present invention has the above-mentioned configuration, it operates as follows. That is, when the humidity detecting means detects the humidity in the vicinity of the windshield, the automatic air-conditioning controller of the present invention adjusts the intake ratio so that the proportion control means increases the intake ratio of the outside air as the humidity in the vicinity of the windshield increases. In addition to controlling the means, the defroster adjusting means is controlled so as to increase the blowing rate of the air conditioning air from the defroster duct as the humidity near the windshield increases.

Therefore, when the humidity in the vicinity of the windshield increases, the rate of intake of outside air into the air conditioner increases, and the rate of air conditioning air blown out from the defroster increases.

[Embodiment] Next, an embodiment of the automatic air conditioning control device of the present invention will be described in detail.

FIG. 2 is a schematic configuration diagram showing an automatic air conditioning control device according to an embodiment of the present invention.

The automatic air conditioning control system of this embodiment shown in FIG.
, A ventilation duct 2 is arranged in the front part of the ventilation duct 2. Inside the ventilation duct 2, an inside / outside air switching damper 3 for obtaining a ratio of intake of inside air and outside air, a blower 4 for determining the amount of air taken into the vehicle compartment 1, a vehicle A well-known air mix section 5 that determines the temperature inside the room, a blower outlet switching damper 6 that switches the air blown into the passenger compartment to the defroster outlet 1a, the vent outlet 1b, and the heater outlet 1c, the vent outlet 1b, and the heater outlet. A vent / heater switching damper 7 for further switching between 1c and 1c is attached. Inside / outside air switching damper 3, blower 4, air mix section
5, blower outlet switching damper 6 and heater / vent switching damper 7
Are configured to be driven by an inside / outside air switching actuator 8, a blower motor 9, an air mix unit driving unit 10, an outlet switching actuator 11, and a vent / heater switching actuator 12, respectively. Further, each of these actuators and drive units are connected so as to be controlled by an electronic control circuit 13, and the electronic control circuit 13 controls each of the inside air temperature sensor 14, the outside air temperature sensor 15, the fog sensor 16 and the temperature setting device 17. Operates based on the input value. The inside air temperature sensor 14 is provided at a location for measuring the temperature inside the vehicle compartment, and the outside air temperature sensor 15 is provided at a location for measuring the temperature outside the vehicle interior. The fogging sensor 16 detects fogging of the windshield F by the reflectance of light on the surface of the windshield F, and is attached to the inside of the windshield F at a position corresponding thereto. Further, the temperature setting device 17 is provided at a position where the driver can operate it, for example, on the front panel or the like.

Next, the configuration of the electronic control circuit 13 will be described.

FIG. 3 is a block diagram showing the electronic control circuit 13.

The electronic control circuit 13 has a well-known central processing unit (CPU) 20, read-only memory (ROM) 21, random access memory 22 and the like, which are connected to an input port 23, output port 24 and the like by a bus 25. It is configured as a logical operation circuit.

For the input port 23, analog signals from the inside air temperature sensor 14, the outside air temperature sensor 15, the cloudiness sensor 16, the temperature setter 17, etc. are selectively selected by the multiplexer 27 via the buffer 26, respectively, and the A / D converter is selected. The analog signal is converted into a digital signal by 28 and is input.

The output port 24 is connected via the D / A converter 29 to the inside / outside air switching actuator 8, the blower motor 9, the air mix section drive unit 10, the outlet switching actuator 11, and the vent heater switching actuator 12, respectively. However, the data output from the output port 24 is converted from a digital amount into an analog amount, and each actuator and drive unit operate according to the output value.

Next, the air conditioning control performed in the present embodiment having the above-mentioned configuration will be described with reference to the flowchart of FIG. 4 and the graphs of FIGS. 5 (A) to 5 (C). The flowchart of FIG. 4 shows the processing based on the input value of the fog sensor 16 among various controls performed by the electronic control circuit 13, and the graphs of FIGS. 5A to 5C show the fog sensor. It represents each controlled variable based on 16 input values.

First, in step 100, various signals including a cloudiness amount S, which is a signal indicating the cloudy state from the cloudy sensor 16, such as the humidity of the vehicle compartment and the temperature of the vehicle compartment are input. Then step 110
Then, according to various signals other than the fog sensor 16 input in step 100, each air conditioning control value for maintaining the inside of the vehicle suitably, for example, the air to be blown into the vehicle in order to bring the temperature inside the vehicle to the set temperature. Execute the calculation that determines the control values such as the temperature and the air volume. Next, in step 120,
It is determined whether or not the fogging amount S, which is the input value of the fogging sensor 16, is equal to or higher than a lower limit level a indicating a predetermined fogging state. If it is determined that the fog amount S is equal to or lower than the lower limit level a, it is determined that the windshield F is not fogged and the process proceeds to step 130.
Based on each control value obtained in step 110, normal air conditioning control, that is, control such as appropriately maintaining the vehicle interior temperature is executed. When it is determined in step 120 that the fog amount S is equal to or higher than the lower limit level a, the process proceeds to step 140, in which it is determined whether or not the fog amount S is equal to or higher than an upper limit level C indicating a predetermined degree of fog. To do. When it is determined that the amount of fog S is equal to or higher than the upper limit level C, it is determined that the windshield is abnormally fog and the fog on the windshield must be immediately removed, and the output port 24 is used to switch between the inside and outside air. The control signal is output to the actuator 8 and the inside / outside air switching damper 3 is switched to the so-called outside air mode in which only the outside air is taken in, and the total blown air volume is blown through the output port 24 so as to be blown out from the defroster outlet 1a. Exit switching actuator
A control signal is output to 11, and the outlet switching damper 6 is set to the so-called defroster mode, and the routine proceeds to step 130. On the other hand, if it is determined in step 140 that the amount of fog S, which is the input value of the fog sensor 16, is equal to or lower than the upper limit level C, the process proceeds to steps 160 to 180, and the windshield F is responsive to the fog condition of the windshield F. The respective control values are set so as to remove the fog and maintain the air conditioning appropriately. The processing at this time will be described in detail with reference to FIGS. 5 (A) to 5 (C).

First, according to the amount of fog S indicating the state of fog, which is the input value of the fog sensor 16, the defroster blow-out amount with respect to the total blown air amount of the automatic air-conditioning controller is shown in the graph of FIG. Is increased, that is, the defroster blowout amount is increased as the cloudiness is worse, the ratio of the defroster blowout amount is calculated (step 160).

Next, as shown in the graph of FIG. 5 (B), the proportion of the outside air and the inside air taken in according to the cloudiness amount S is the proportion of the outside air and the inside air taken in so that the outside air is taken in as the cloudiness is worse. To calculate. (Step 170).

Further, as shown in the graph of FIG. 5 (C), the amount of air blown into the passenger compartment is calculated in accordance with the amount of cloudiness S, and the amount of air blown by the blower 4 is calculated so that the amount of air blow is increased as the cloudiness is worse. To do. (Step 180).

After performing the processing of steps 160 to 180 described above, the routine proceeds to step 130, and the control for air conditioning and removal of fog on the windshield F is executed according to each control value determined in the processing of steps 160 to 180.

Here, as shown in the graph of FIG. 6, if the cloudiness S of the cloudy sensor 16 changes so as to gradually increase with time,
Until the time T1, the fog amount S is below the lower limit level a, so
The normal air-conditioning control of steps 120 to 130 is executed, and the amount of fog S is increased from time T1 to time T2.
Corresponds to the lower limit level a or more and the upper limit level c or less, and the processing corresponding to the above-described fog state in steps 160 to 180 is performed. Further, when the time T2 or more has elapsed, the amount of fog S becomes equal to or more than the upper limit level c, and therefore the process for removing the fog, that is, the processes of steps 150 and 130 are executed immediately.

As described above in detail, according to the automatic air-conditioning control device of the present embodiment, the inside / outside air switching damper 3 and the outlet switching can be performed according to the fog amount S which is the input value of the fog sensor 16 attached to the windshield F. Since the opening of the damper 6 is controlled,
The outside air intake amount and the amount of air blown out from the defroster outlet 1a are controlled so as to increase or decrease according to the cloudy state.
Hereinafter, the degree of haze of the windshield F will be described.

First, when the humidity in the vicinity of the windshield F is low, that is, when the possibility that the windshield F becomes cloudy is low, the intake ratio of the inside air is increased to decrease the defroster blowing ratio. In this case, since the intake ratio of the inside air is high, in the summer, for example, the inside air having a temperature lower than that of the outside air can be sucked into the evaporator of the air mix unit 5, resulting in power saving. In the winter season, the inside air having a temperature higher than the outside air can be sucked into the heater of the air mix unit 5, and the heating load of the heater can be reduced. Further, since the rate of air blown to the defroster outlet 1a is also low, the decrease in the conditioned air from the vent outlet 1b or the heater outlet 1c is slight,
There is no danger of causing occupant discomfort.

When the humidity in the vicinity of the windshield F is high and the haze S of the windshield F is high, the intake ratio of the outside air having a lower humidity than that of the inside air is increased, the relative humidity of the air for air conditioning is lowered, and the blowing ratio of the defroster is increased. . Thereby, a large amount of low-humidity air for in-air can be guided to the windshield F, and the fog on the windshield F can be rapidly removed to improve the visibility of the driver. Therefore, for example, it is not necessary to operate an air conditioning compressor for the purpose of removing fogging, and it is also excellent in terms of power saving.

Further, although the haze S of the windshield F is still not visible, when the humidity in the vicinity of the windshield F is high, it is sufficient to dehumidify according to the humidity. Therefore,
The outside air intake rate and the defroster air blowing rate do not need to be particularly high. Therefore, for example, it is avoided that the occupant feels uncomfortable due to a decrease in the amount of conditioned air from the heater outlet 1c. In addition, the power consumption can be improved by reducing the outside air intake ratio and the defroster air blowing ratio in accordance with the decrease in the vehicle interior humidity due to the dehumidification.

In this way, the outside air intake ratio and the defroster blown air amount are increased or decreased according to the amount of fog S on the windshield F. The dehumidifying surface, the provision of comfort by air conditioning and the power saving surface can be balanced. Further, since the control of the outside air intake ratio and the defroster air blowing ratio is automatically performed, it is not necessary for the driver to operate the mode changeover switch or the like, for example, and the driver is relieved from the troublesome operation of such a switch. You can concentrate on driving.

Furthermore, in the present embodiment, the air flow rate of the blower 4 is controlled according to the cloudiness amount S of the cloudy sensor 16. In other words, the humidity change in the passenger compartment greatly changes depending on the number of passengers and the like, and when the humidification amount is large, the blower amount of the blower 4 is increased, so that it is possible to quickly remove the fog on the windshield.

In this embodiment, the fogging sensor 16 attached to the windshield F is used to determine the air flow rate of the blower 4.
However, it goes without saying that a humidity sensor for detecting the humidity inside the vehicle may be used.

Although the fog sensor 16 that detects the degree of haze S of the windshield F is used in the above-described embodiment, a humidity sensor that detects the humidity in the vicinity of the windshield F is used instead of the fog sensor 16 and is detected by this. Needless to say, even if the humidity is changed to the haze S, the same action and effect as in the present embodiment can be obtained.

Effect of the Invention In the automatic air conditioning control device of the present invention, the intake ratio adjusting means is controlled so that the intake ratio of the outside air increases as the humidity near the windshield increases, and the defroster duct from the defroster duct increases as the humidity increases. Since the defroster adjusting means is controlled so as to increase the blowing rate of the air for air conditioning, the following effects are achieved.

That is, for example, the humidity near the windshield is quite low,
When the possibility that the windshield is clouded is low, the intake ratio of outside air can be reduced. In other words, the intake rate of the inside air can be increased. Therefore, in the summer, for example, it is possible to increase the ratio of taking in the inside air at a temperature lower than that of the outside air, and as a result, the temperature of the air taken in by the evaporator becomes lower, and the cooling load of the evaporator becomes smaller, resulting in power saving. Further, in the winter season, it is possible to increase the ratio of taking in the inside air having a temperature higher than that of the outside air, and as a result, the temperature of the air taken in by the heater becomes high, and the heating load of the heater can be reduced. Further, at this time, since the proportion of the air-conditioning air blown out from the defroster duct is small, the amount of air blown out from the upper blow-out port or the lower blow-out port is small, and there is no fear of causing occupant discomfort. In addition, since the proportion of air-conditioning air blown out from the defroster duct is small, it is possible to prevent warm air from being blown out to the occupant's head, and as a result, it is possible to maintain the air conditioning condition of head cold foot heat and give the occupant a comfortable feeling. it can.

If the humidity near the windshield is high, there is a great need to dehumidify the windshield immediately.In this case, even if the air-conditioning surface is slightly damaged, the dehumidification surface must be prioritized, increasing the intake ratio of outside air. The amount and the increase amount of the blowout ratio of the air conditioning air from the defroster duct increase.
Therefore, it is possible to introduce a large amount of low-humidity outside air by increasing the intake ratio of outside air, and moreover, by increasing the ratio of air conditioning air blown out from the defroster duct, the cloud of the windshield is quickly removed. be able to.

As described above, it is possible to balance the dehumidifying surface, the air conditioning surface, and the power saving surface by increasing or decreasing the intake ratio of the outside air and the blowing ratio of the air conditioning air from the defroster duct according to the humidity near the windshield. There is an excellent effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a basic configuration diagram showing an example of an automatic air conditioning control device of the present invention, and FIG. 2 is a schematic configuration diagram of an automatic air conditioning control device showing an embodiment of the present invention. The figure shows the electronic control circuit 13 of this embodiment.
4 is a flow chart showing a process executed by the electronic control circuit 13 of the present embodiment, and FIGS. 5A, 5B and 5C are also electronic control circuits of the present embodiment. FIG. 6 is a graph showing various control amounts controlled by 13, and FIG. 6 is a graph showing an example of changes in the fog amount S which is an input value of the fog sensor 16. 1 …… Vehicle compartment 2 …… Ventilation duct 3 …… Inside / outside air switching damper 4 …… Blower 5 …… Air mix section 6 …… Blowout outlet switching damper 7 …… Bent / heater switching damper 8 …… Inside / outside air switching actuator 9 ...... Blower motor 10 ...... Air mix section drive section 11 ...... Outlet switching actuator 12 ...... Vent / heater switching actuator 13 ...... Electronic control circuit 14 ...... Inside air temperature sensor 15 ...... Outside air temperature sensor 16 ...... Fog sensor 17 ... Temperature setting device

Front Page Continuation (72) Inventor Takashi Watanabe 1-1, Showa-cho, Kariya City, Aichi Prefecture, Nihon Denso Co., Ltd. (56) References JP-A-57-70720 (JP, A) JP, U)

Claims (1)

[Claims] 1. An automatic air-conditioning controller mounted on an air conditioner for a vehicle, comprising intake ratio adjusting means for adjusting the intake ratio of the inside air inside the vehicle and the outside air outside the vehicle taken into the air conditioner. In an automatic air conditioning control device equipped with a defroster adjusting means for adjusting the ratio of the amount of air blown into the vehicle interior toward the windshield via the defroster duct, the humidity in the vicinity of the windshield in the vehicle interior And a humidity detecting means for detecting the above, while controlling the intake ratio adjusting means so as to increase the intake ratio of the outside air as the humidity becomes higher, and the blowing ratio of the air conditioning air from the defroster duct as the humidity becomes higher. The automatic air-conditioning control device is provided with a ratio control means for controlling the defroster adjusting means so as to increase the air conditioner.