JPH07257168A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To provide an air conditioner for a vehicle where the responsiveness in detecting the humidity is excellent, the deterioration of the characteristic in detecting the humidity can be suppressed, and the increase in the cost can be suppressed without using an exclusive filter to detect the humidity. CONSTITUTION:A filter 50 to purify the passing air is supported by a guide 51 over the whole surface of an air conditioning duct 5 in the air-conditioning duct 5 on the upstream side of an evaporator (a cooling means) 6. A storing space where the air passing through the filter 50 flows is provided in the end of this guide 51, and a humidity sensor 55 is arranged in this space. A part of the air which flows in the air-conditioning duct 5 by a blower 4 and is purified by the filter 50 is guided to the humidity sensor 55, and impurities are stuck on the humidity sensor 55 to suppress the deterioration of the detecting characteristic, and the responsiveness is excellent. Because no exclusive filter for the humidity sensor is used, the increase in the cost can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for a vehicle in which the cooling means is operated based on the humidity of the air blown into the passenger compartment to prevent the window glass of the vehicle from being fogged and to eliminate the occupant's discomfort. Regarding an air conditioner.

[0002]

2. Description of the Related Art As a technique for providing a humidity detecting sensor for detecting the humidity inside a vehicle, for example, a plurality of the following techniques are known. a-1) Japanese Utility Model Publication No. 62-135608 discloses a technique for detecting the humidity of a window glass by a humidity sensor, which includes a fixing portion mounted on the vehicle ceiling above the window glass and a holding portion for holding a humidity sensor. It is disclosed. b-1) Japanese Patent Laid-Open No. 62-110521 discloses a humidity detecting passage for guiding air in the vehicle compartment, a humidity sensor provided in the passage, and a fan motor for sucking air in the vehicle compartment into the passage. There is disclosed an aspirator specifically for detecting humidity.

C-1) Japanese Patent Laid-Open No. 64-67414 discloses a technique in which humidity sensors are arranged upstream and downstream of an evaporator disposed in an air conditioning duct. d-1) Japanese Denso Public Technical Report, serial number 27-076 (issued on July 20, 1982), filters such as a mesh for protecting the humidity sensor from dust and oil are provided upstream and downstream of the humidity sensor. The arranged technology is disclosed.

[0004]

However, the above-mentioned conventional technique has the following drawbacks. a-2) The technique disclosed in Japanese Utility Model Publication No. 62-135608 can detect the humidity of the window glass with good responsiveness when the conditioned air is blown out relatively strongly from the defroster outlet, but the defroster outlet When the conditioned air blown from the air is weak or when the conditioned air is not blown from the defroster outlet, the airflow near the humidity sensor becomes gentle or natural convection occurs, and the responsiveness of the humidity sensor deteriorates. b-2) In the technique disclosed in Japanese Patent Laid-Open No. 62-110521, it is necessary to attach an aspirator equipped with a fan motor to the vehicle separately from the air conditioning duct. Therefore, the additional cost of the aspirator and the assembling of the aspirator are required. The cost will increase significantly due to the addition of the vehicle structure.

C-2) In the technique disclosed in Japanese Patent Application Laid-Open No. 64-67414, two humidity sensors are arranged in front of and behind the evaporator, so that the cost of the humidity sensor and the installation cost are doubled. Also, inside the air conditioning duct,
In addition to the large flow rate of air, inflowing dust (exhaust air) or the like flows through the air-conditioning duct when the air outside the vehicle (outside air) is introduced, and cigarette smoke or the like flows when introducing the air inside the vehicle (inside air). Therefore, if the humidity sensor is simply arranged in the air conditioning duct, impurities tend to adhere to the humidity sensor and the characteristics of the humidity sensor deteriorate. d-2) Then, Nippon Denso Public Technical Report, reference number 27-0
When the protective filter is arranged on the humidity sensor as in the technique disclosed in Japanese Patent No. 76, the cost increases due to the provision of the filter for the sensor, and the airflow flowing into the humidity sensor is restricted in the air conditioning duct. As a result, the responsiveness of the humidity sensor deteriorates.

[0006]

It is an object of the present invention to provide a vehicle having excellent humidity detection responsiveness, suppressed deterioration of humidity detection characteristics, and a humidity detecting means which does not use a dedicated filter for detecting humidity. In the provision of an air conditioner for use.

[0007]

An air conditioner for a vehicle according to the present invention comprises: (a) a duct forming an air passage for blowing air toward the vehicle interior; and (b) air directed into the vehicle interior in the duct. A blower for generating a flow, (c) cooling means provided in the duct for cooling air, and (d)
A filter disposed in the duct upstream of the cooling means and over the entire surface of the duct to purify air passing through the duct; and (e) between the filter and the cooling means. Humidity detection means disposed in the duct, for detecting the humidity of the air flowing in the duct,
(F) Technical means including a humidity control means for operating the cooling means based on the humidity detected by the humidity detection means.

The present invention may employ the following means. The filter is supported in the duct by a guide which is a frame, and the guide is provided with a storage space in which air passing through the filter flows downstream of the filter, and the humidity detecting means is disposed in the storage space. It

The cooling means is an evaporator of the refrigeration cycle, and the humidity control means operates the evaporator by operating the compressor of the refrigeration cycle when the humidity detected by the humidity detecting means is equal to or higher than a predetermined humidity.

The vehicular air conditioner is provided in a duct downstream of the cooling means and heats the air, and bypasses the heating means and the amount of air heated by the heating means downstream of the cooling means in the duct. Temperature adjusting means for adjusting the bypass amount to be set, temperature setting means for setting the temperature by the user, and controlling the temperature adjusting means so that the temperature in the vehicle compartment is maintained at the temperature set by the temperature setting means. Automatic temperature control means.

The vehicle air conditioner may be used by a user.
Equipped with an economy switch that gives an instruction to suppress the operation of the cooling means, the humidity control means operates when the economy switch is selected.

[0012]

[Operation of the invention]

(Operation of Claim 1) When the vehicle air conditioner operates, an air flow toward the passenger compartment is generated in the duct by the operation of the blower. After removing impurities by the filter, this air flow is blown into the vehicle compartment through the cooling means. A part of the air flow that has passed through the filter passes through the humidity detecting means. In this way, since the air flow from which the impurities have been removed by the filter is guided to the humidity detecting means, it is possible to prevent the impurities from adhering to the humidity detecting means. Further, since the air flow generated by the operation of the blower and a part of the air flow that has passed through the filter are guided to the humidity detection means, the humidity detection response is excellent.

The humidity detected by the humidity detecting means is the humidity for operating the cooling means (for example, a predetermined humidity or more,
Alternatively, the humidity control means actuates the cooling means when there is a possibility that the window glass may become cloudy, which is obtained from the relationship between the outside air temperature, the indoor temperature, and the humidity. When the cooling means is activated, the air passing through the cooling means is cooled and dehumidified by the cooling means and blown out into the vehicle interior to suppress the humidity inside the vehicle interior.

[0014]

【The invention's effect】

(Effect of claim 1) In the air conditioner of claim 1, as described above, the humidity detecting means introduces the air flow from which the impurities have been removed by the filter, so that the humidity detecting means receives the impurities. It is possible to suppress the adherence of, and as a result, it is possible to suppress the deterioration of the humidity detection characteristic.

Further, to the humidity detecting means, a part of the air flow generated by the operation of the blower and passing through the filter is introduced. Therefore, the air flow flowing into the humidity detecting means is not restricted by the filter, and the air flow generated by the blower is forcibly guided to the humidity detecting means. As a result, the humidity detection means has excellent responsiveness in humidity detection.

Further, the filter is provided over the entire surface of the duct in order to improve the quality of the air blown from the duct into the passenger compartment, and is not for protecting the humidity detecting means. That is, since the humidity detecting means is not provided with a dedicated filter, the filter dedicated to the humidity detecting means does not increase the cost.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a vehicle air conditioner of the present invention will be described based on the embodiments shown in the drawings. [Configuration of Embodiment] FIGS. 1 to 13 show an embodiment of the present invention, and FIG. 1 is a schematic configuration diagram of an air conditioner for an automobile. The vehicle air conditioner of this embodiment is equipped with an automatic air conditioner function for automatically maintaining the temperature inside the vehicle compartment at a set temperature. The vehicle air conditioner is roughly classified into an air conditioning unit 1 and this air conditioning unit. 1 and a control device 2 for controlling each functional component.

(Description of Air Conditioning Unit 1) Air Conditioning Unit 1
Is an inside / outside air switching unit 3 for switching the inside air (inside air) and the outside air (outside air) to the inside of the vehicle, and a blower for sending the air selected by the inside / outside air switching unit 3 into the inside of the vehicle. 4, an air conditioning duct 5 that guides the air flow generated by the blower 4 into the passenger compartment, an evaporator 6 that is a cooling unit that cools the air flowing in the air conditioning duct 5, and a heating unit that heats the air downstream of the evaporator 6. The heater core 7 and the air mix type temperature adjusting means 8 for adjusting the temperature of the air blown out from the air conditioning duct 5 are provided. In addition,
In this embodiment, the inside / outside air switching unit 3, the blower 4, and the air conditioning duct 5 constitute the duct of the present invention that forms an air passage for blowing air toward the vehicle interior.

The inside / outside air switching means 3 is provided at the air suction port of the blower 4 and switches the air sucked into the blower 4 into the inside air or the outside air. The inside air introduction port 10 is connected to the inside of the vehicle to introduce the inside air. An outside air introduction port 11 that communicates with the outside of the vehicle and introduces outside air is provided. Further, the inside / outside air switching means 3
Includes an inside / outside air switching damper 12 capable of closing the inside air inlet 10 or the outside air inlet 11. The inside / outside air switching damper 12 is driven by a servo motor 13, and switches between an inside air circulation mode in which inside air is introduced from the inside air introduction port 10 and an outside air introduction mode in which outside air is introduced from the outside air introduction port 11.

The blower 4 is connected to the upstream end of the air conditioning duct 5 and produces an air flow in the air conditioning duct 5 toward the passenger compartment. This blower 4 has a fan case 1
5, the fan 16 and the fan motor 17, the fan motor 17 rotationally drives the fan 16 according to the voltage applied from the blower drive circuit 18, and sends the inside air or the outside air into the vehicle compartment through the air conditioning duct 5.

The air conditioning duct 5 is arranged on the front side in the vehicle compartment. The outlet side of the air conditioning duct 5 is provided with a plurality of air outlets for blowing the air passing through the air conditioning duct 5 toward each part in the vehicle interior. The air outlets are face air outlets 20 that mainly blow cold air toward the upper body of the occupant, foot air outlets 21 that mainly blow warm air toward the feet of the occupants, and hot air mainly toward the window glass 22. It consists of a defroster outlet 23 that blows out. In the air conditioning duct 5, a face damper 24, a foot damper 25, and a defroster damper 26 that adjust the air flow rate to each air outlet are provided in an air passage communicating with each air outlet. Then, the face damper 24, the foot damper 25,
The defroster damper 26 is driven by servomotors 27 to 29, respectively.

The evaporator 6 is a constituent element of the refrigeration cycle 30 for cooling the air passing through the inside of the air conditioning duct 5, and is arranged on the entire upstream surface of the inside of the air conditioning duct 5 to remove all the air passing through the inside of the air conditioning duct 5. Cooling. The refrigeration cycle 30 shown in the present embodiment includes the evaporator 6 to the compressor 3.
It has a well-known configuration in which the refrigerant circulates through the evaporator 6 through the condenser 1, the condenser 32, the receiver 33, and the expansion valve 34. And the compressor 31
Is an engine (not shown) via an electromagnetic clutch 31a.
The rotation power is transmitted to drive the refrigeration cycle 30. The electromagnetic clutch 31a
When the voltage is supplied from the compressor drive circuit 35, the engine rotation is transmitted to the compressor 31 to obtain the air cooling capacity by the evaporator 6, and conversely, when the voltage supply from the compressor drive circuit 35 is stopped. The electromagnetic clutch 31a stops transmitting the rotation of the engine to the compressor 31, and the cooling of the air by the evaporator 6 is stopped.

The heater core 7 is a heating means of the present invention for heating the air passing through the inside of the air conditioning duct 5 downstream of the evaporator 6, and uses cooling water (hot water) of the engine,
The cold air that has passed through the evaporator 6 is heated.

The temperature adjusting means 8 comprises an air mix damper 41 for adjusting the amount of air that passes through the heater core 7 and is heated by the heater core 7, and the amount of air that passes through the bypass passage 40 that bypasses the heater core 7. The air mix damper 41 is driven by a servo motor 42, and adjusts the amount of air passing through the heater core 7 and the amount of air passing through the bypass passage 40 according to the opening degree set by the servo motor 42.

A filter 50 for purifying the air blown into the vehicle compartment is arranged over the entire surface of the air conditioning duct 5 in the air conditioning duct 5 immediately in front of the evaporator 6 as a cooling means. The filter 50 includes a filter medium (for example, paper, woven fabric, non-woven fabric using natural fibers, woven fabric, non-woven fabric, or porous resin using chemical fibers) that captures dust passing therethrough, and cigarettes and exhaust gas. A composite filter that uses a composite of an adsorbent that absorbs odors (such as activated carbon, porous ceramics, etc.) or a single-function filter of the above-mentioned dust removal type and deodorization type described later, which is folded, grid-shaped, flat plate The shape is provided according to the purpose, such as a shape.

This filter 50, as shown in FIG.
The periphery is supported by the guide 51, which is a frame, and a part of the inside is supported in a cross shape. The guide 51 is made of resin, for example, and is slid into the air conditioning duct 5 together with the filter 50 through an insertion / detachment insertion hole 52 provided on one surface (for example, a lower surface) of the air conditioning duct 5. (See Figure 3).

A storage space 53, in which a part of the air passing through the filter 50 flows, is provided at the upper corner of the guide 51 and on the side closer to the evaporator 6 than the filter 50 (downstream of the filter 50). It is formed integrally with (see FIGS. 2 to 4). This storage space 53
Is provided with a plurality of ventilation holes 54 on the upstream side and the downstream side so that a part of the air passing through the filter 50 flows.

An electric resistance type humidity sensor 55, which is a humidity detecting means shown in FIGS. 5 and 6, is assembled in the storage space 53. This humidity sensor 55
Any type can be used as long as it can convert a humidity change into an electric change. In the present embodiment, the substrate 56 is used.
A pair of electrodes 57 (for example, comb-shaped electrodes) are arranged to face each other on the surface of (for example, porous ceramic such as alumina), and a moisture sensitive material 58 (for example, zinc oxide or zinc phosphate) whose resistance value changes according to humidity on the surface. Etc.) is used with a known sensor. Then, as shown in FIG. 3, the two lead wires 59 connected to the pair of electrodes 57 via the metal clip-shaped connection terminals 59a have the intermediate holding portion 51a provided in the guide 51 and the external insertion hole 51b. Through the air conditioning duct 5, and is connected to the control device 2 via the connector 59b.

(Explanation of Control Device 2) The control device 2 controls each electric functional component of the above-mentioned air conditioning unit 1.
A CPU, ROM, RAM and the like (not shown) are mounted. A program for air conditioning control is stored in the ROM, and the CPU performs various calculations and processing based on the air conditioning information temporarily stored in the RAM.

The output terminals A to E of the control device 2 are connected to the servomotors 13, 27, 28, 29 and 42, respectively, and drive and control each damper via each servomotor.
The output terminal F of the control device 2 is connected to the blower drive circuit 18, and controls the air volume generated by the blower 4 via the blower drive circuit 18. The servo motor 42 that drives the air mix damper 41 has an opening θ of the air mix damper 41.
An air mix damper opening degree sensor 63 for detecting is provided and is connected to an input terminal G of the control device 2.

The output terminal H of the controller 2 is connected to the compressor drive circuit 35, controls the electromagnetic clutch 31a via the compressor drive circuit 35, and operates the compressor 31, that is, the evaporator 6 which is a cooling means. To control. In addition, the compressor drive circuit 35,
Clutch operation detection means for detecting the energized state of the electromagnetic clutch 31a is provided and is connected to the input terminal I of the control device 2.

Further, the input terminals J to M of the control device 2 are
An inside / outside air changeover switch 65 (means for switching between outside air and inside air) provided on an operation panel operated by a vehicle occupant, a temperature setter 66 (temperature setting means for setting a target temperature in the vehicle interior), and an outlet mode setting switch 67. (Means for selecting the blowout mode) and economy switch 68 (means for selecting to suppress the energy consumption of the refrigeration cycle 30). The input terminals N to S of the control device 2 include an inside air sensor 70 that detects the temperature of air inside the vehicle, an outside air sensor 71 that detects the temperature of air outside the vehicle,
A solar radiation sensor 72 that detects the amount of solar radiation that enters the vehicle interior, an after-evaporation sensor 73 that detects the temperature of air that has passed through the evaporator 6 (hereinafter, the after-evaporation temperature), a water temperature sensor 74 that detects the cooling water temperature of the heater core 7, and Humidity sensor 55
It is connected to the.

When the user selects the automatic air conditioner, the control device 2 automatically controls the blowout temperature, the air flow rate, and the blowout port so that the temperature inside the passenger compartment is maintained at the temperature set by the temperature setting device 66. An automatic temperature control means 80 for controlling is provided. The CPU of the control device 2 has an automatic temperature control means 8
In order to execute 0 (automatic air conditioner), the target outlet temperature TAO is calculated by the following mathematical formula 1 based on the input sensor signal.

[Equation 1] TAO = Kset-Tset-Kr-Tr-Kam-
Tam-Ks.Ts + C Kset, Kr, Kam, Ks, and C are constants for correction. Further, Tset is a set temperature signal detected by the temperature setter 66, Tr is an inside air temperature signal detected by the inside air sensor 70, Tam is an outside air temperature signal detected by an outside air sensor 71, and T is
s is a solar radiation signal detected by the solar radiation sensor 72.

Next, the control device 2 calculates the target opening degree θ0 of the air mix damper 41 by the following mathematical expression 2.

[Equation 2] θ 0 = {(TAO-TE) / (TW-TE)}
× 100 (%) TE is the post-evaporation temperature signal of the post-evaporation sensor 73, TW
Is a water temperature signal of the water temperature sensor 74. Then, the control device 2 outputs a signal according to the target opening degree θ0 of the air mix damper 41 to the servo motor 42.

Further, the control device 2 is provided so that when the economy switch 68 is selected, the compressor 31 is economy-controlled so as to reduce the cooling load of the air in an environment where dehumidification and cooling are not required so much. . Specifically, in the present embodiment, the outside air temperature control unit 81 that controls the operation of the compressor 31 according to the outside air temperature, and the humidity that controls the operation of the compressor 31 according to the humidity of the air before passing through the evaporator 6. And a control means 82.

As shown in FIG. 7, the outside air temperature control means 81 controls the after-evaporator temperature for operating the compressor 31 in accordance with the outside air temperature detected by the outside air sensor 71 (broken line TON in the figure).
Then, the post-evaporation temperature (solid line TOFF in the figure) for stopping the operation of the compressor 31 is set. Then, the actual control of the compressor 31 by the control device 2 is as shown in FIG.
When the post-evaporation temperature detected by the post-evaporation sensor 73 reaches TON set by the outside air temperature, the compressor drive circuit 35
The electromagnetic clutch 31a is turned on via the compressor 31
When the post-evaporation temperature detected by the post-evaporation sensor 73 drops to TOFF set by the outside air temperature signal Tam, the electromagnetic clutch 31 is passed through the compressor drive circuit 35.
A is turned off to stop the operation of the compressor 31.

The humidity control means 82, as shown in FIG.
When the humidity detected by the humidity sensor 55 provided in the guide 51 that supports the filter 50 reaches or exceeds the first predetermined humidity, the electromagnetic clutch 31a is turned on via the compressor drive circuit 35.
When the humidity detected by the humidity sensor 55 drops below the second predetermined humidity, the electromagnetic clutch 31a is turned off via the compressor drive circuit 35 to stop the operation of the compressor 31. In this example,
Although the example in which the compressor 31 is operated when the humidity exceeds a certain level is shown, the humidity at which the compressor 31 operates (or the humidity at which the compressor 31 stops) may be provided so as to change depending on other physical conditions such as the outside air temperature.

When the automatic air conditioner is selected, the control device 2 is provided so as to automatically select the inside / outside air mode, the air volume of the blower 4, and the blowing mode from the target blowing temperature TAO. As shown in FIG. 10, the switching control of the inside / outside air mode is automatically set to the inside air or the outside air according to the target outlet temperature TAO. The air volume control of the blower 4 is shown in FIG.
As shown in, the applied voltage of the blower is automatically set according to the target outlet temperature TAO. As shown in FIG. 12, the automatic switching control of the blowout mode includes a face mode in which the cool air is blown out only from the face outlet 20 in accordance with the target blowout temperature TAO. The bi-level mode in which hot air is blown from the foot and the foot mode in which hot air is blown from the foot outlet 21 are automatically set.

(Description of Operation of Controller 2) Next, an example of the automatic air conditioner control by the controller 2 will be described with reference to the flowchart of FIG. First, when the automatic air conditioner is selected (start), initialization processing of data, timer, flags and the like is first performed (step S1). Next, the set temperature signal Tset is read from the temperature setter 66 and stored in the RAM (step S2). Subsequently, input signals are read from various sensors that detect a vehicle environmental state that affects the air conditioning state in the vehicle interior. That is, the inside air temperature signal Tr from the inside air sensor 70 and the outside air temperature signal Ta from the outside air sensor 71.
m, solar radiation signal Ts from solar radiation sensor 72, post-evaporation sensor 7
The post-evaporation temperature signal TE from 3 and the water temperature signal TW from the water temperature sensor 74 are read and stored in the RAM (step S3
).

Next, the target blow-out temperature TAO of the air blown into the vehicle compartment is calculated based on the various input data stored in the RAM and the above-mentioned formula 1 stored in the ROM in advance (step S4). Then, based on the various input data stored in the RAM and the above-described mathematical expression 2 stored in the ROM in advance, the target opening θ of the air mix damper 41 is set.
0 is calculated (step S5).

Next, the inside / outside air switching mode is set to step S.
It is determined from the relationship between the target outlet temperature TAO calculated in step 4 and FIG. 10 (step S6). The applied voltage of the blower 4 is determined from the relationship between the target outlet temperature TAO calculated in step S4 and the applied voltage of FIG. 11 (step S7). The blowout mode is determined from the target blowout temperature TAO calculated in step S4 and the relationship in FIG. 12 (step S8).

Next, it is judged whether or not the economy switch 68 is selected (step S9). If the result of this determination is NO, the flow proceeds to step S10, and a decision is made to turn on the compressor 31. On the other hand, if the decision result in the step S9 is YES, the process advances to a step S11 to decide whether or not the condition for operating the compressor 31 by the operation of the outside air temperature control means 81 is met. That is, this step S
In 11, the operation of the compressor 31 is determined from the relationship between the post-evaporator temperature and FIGS. And this step S
If the determination result in 11 is YES, the process proceeds to step S10, and it is determined to turn on the compressor 31.

On the other hand, if the decision result in the step S11 is NO, the process advances to a step S12 to decide whether or not the condition for operating the compressor 31 by the operation of the humidity control means 82 is met. That is, in this step S12, the operation of the compressor 31 is determined from the relationship between the detected humidity and FIG. Then, if the determination result in step S12 is YES, the process proceeds to step S10, and it is determined to turn on the compressor 31. On the contrary, if the decision result in the step S12 is NO, the process advances to a step S13 to decide to turn off the compressor 31.

Next, the control signal determined by the above-mentioned procedure is sent to the blower drive circuit 18, the inside / outside air switching servo motor 13,
Output to the servo motors 27 to 29 for switching the blowout modes, the compressor drive circuit 35, the servo motor 42 for driving the air mix damper 41, etc. (step S14),
It controls the operation of each air conditioner. After that, it is determined whether or not the control cycle time τ has elapsed after executing the process of step S14 (step S15). If the result of this determination is NO, the control cycle time τ is awaited. And step S
If the decision result in 15 is YES, the process returns to step S2 and the above calculation and processing are repeated.

[Operation of Embodiment] Next, the humidity control means 82
The operation of the air conditioner according to the present invention will be described. The air introduced into the air conditioning duct 5 from the inside / outside air switching means 3 by the operation of the blower 4 first passes through the filter 50, and the dust and unpleasant odor contained in the air are removed by the filter 50. A part of the air from which impurities and unpleasant odors have been removed after passing through the filter 50 is guided by a guide 51 that supports the filter 50.
Is guided into the storage space 53 provided in the. That is,
Part of the air sent from the blower 4 and passing through the filter 50 is guided to the humidity sensor 55 in the storage space 53.

(When low-humidity air is introduced into the air conditioning duct 5) Here, the humidity detected by the humidity sensor 55 is low,
When the first predetermined humidity is not reached, the compressor 31 is OF
F Then, the evaporator 6 does not operate. Then, the air that has passed through the filter 50 passes through the evaporator 6 that does not operate, and then the temperature is adjusted by the temperature adjusting means 8 so as to reach the target outlet temperature TAO, and is blown into the vehicle compartment from the outlet.

(When high-humidity air is introduced into the air-conditioning duct 5) When the humidity detected by the humidity sensor 55 is higher than the first predetermined humidity, the compressor 31 is turned on.
Then, the evaporator 6 operates. The air that has passed through the filter 50 is cooled and dehumidified when passing through the operating evaporator 6. Then, the cooled and dehumidified air is then subjected to the target outlet temperature TAO by the temperature adjusting means 8.
The temperature is controlled so that

[Effects of the Embodiment] In this embodiment, the humidity sensor 55 includes the filter 50 as described above.
The air flow with the impurities removed,
It is possible to prevent dust, impurities such as outside air gas and cigarette smoke from adhering to the humidity sensor 55. Therefore, the humidity detection characteristic of the humidity sensor 55 is maintained for a long period of time.

Further, since the air flow generated by the operation of the blower 4 and a part of the air flow passing through the filter 50 are guided to the humidity sensor 55, the air flow flowing into the humidity sensor 55 by the filter 50 is restricted. Never be done. That is, since the airflow generated by the blower 4 is guided to the humidity detecting means, the humidity detecting response is good. Further, it is also possible to improve the detection accuracy by correcting the responsiveness that changes depending on the wind speed with the blower application function.

Further, the filter 50 is provided over the entire surface of the air conditioning duct 5 in order to improve the quality of the air blown from the air conditioning duct 5 into the passenger compartment, and protects the humidity sensor 55. Not a dedicated filter. That is,
Since no special filter is used for the humidity sensor 55, the cost does not increase due to the special filter.

[Second Embodiment] FIG. 14 is a schematic view of a main portion of an air conditioning unit 1 showing a second embodiment. The present embodiment is an example in which a filter 50 is mounted on the downstream side of the inside / outside air switching means 3 and on the upstream side of the air intake port of the blower 4. In this embodiment, as in the first embodiment, the humidity sensor 55 is attached to the guide 51 that supports the filter 50.

[Modification] In the above-described embodiment, the economy switch is provided and the economy operation is performed only when the economy switch is selected. However, the economy switch is abolished and the economy operation is always performed. It may be provided. Although the example in which the humidity detecting means is provided in the guide supporting the filter is shown, the humidity detecting means may be located between the filter and the cooling means, and it is arranged in the duct separately from the guide supporting the filter. May be.

An example in which the present invention is applied to a vehicle air conditioner having an automatic air conditioner function for automatically maintaining the temperature inside the vehicle compartment at the temperature set by the temperature setting device has been shown. The present invention may be applied to an air conditioner. Although an evaporator of a refrigeration cycle in which a refrigerant is circulated is shown as an example of the cooling means, other cooling means such as a refrigeration cycle using another medium such as air or a cooling means using a Peltier element may be used. Although the heater core 7 using cooling water as a heat source is shown as an example of the heating means, other heating means such as an electric heater (for example, a PTC heater) or a combustion heater may be used.

As an example of the temperature adjusting means, an example of adjusting the amount of air passing through the heating means and the amount of bypass air is shown. However, for example, when a heater core is used, the supply amount of cooling water may be adjusted. Other adjusting means may be used, such as adjusting the energization amount when using an electric heater, or adjusting the combustion amount when using a combustion heater. As an example of the humidity detecting means, an example using an electric resistance type humidity sensor has been shown, but other sensors such as a capacitance type, a telescopic type, a microwave type, etc. can be used as long as they are sensors capable of converting a humidity change into an electric signal. A humidity sensor may be used.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a vehicle air conditioner (embodiment).

FIG. 2 is a view of the filter and the guide as seen from the evaporator side (embodiment).

FIG. 3 is a schematic view of a cooling unit showing a mounting state of a guide (Example).

FIG. 4 is a cross-sectional view showing a storage space provided in the guide (example).

FIG. 5 is a front view of a humidity sensor (Example).

FIG. 6 is a side view of the humidity sensor (Example).

FIG. 7 is a graph showing an operation relationship between an outside air temperature and a post-evaporator temperature (Example).

FIG. 8 is a graph showing the relationship between the post-evaporation temperature and the operation of the compressor (Example).

FIG. 9 is a graph showing the relationship between the detected humidity and the operation of the compressor (Example).

FIG. 10 is a graph showing a relationship between a target outlet temperature TAO and an inside / outside air mode (Example).

FIG. 11 is a graph showing the relationship between the target outlet temperature TAO and the voltage applied to the blower (Example).

FIG. 12 is a graph showing a relationship between a target outlet temperature TAO and an outlet mode (Example).

FIG. 13 is a flowchart showing the operation of the control device (embodiment).

FIG. 14 is a schematic view of a main part of an air conditioning unit (second embodiment).

[Explanation of symbols]

 4 Blower 5 Air Conditioning Duct 6 Evaporator (Cooling Means) 7 Heater Core (Heating Means) 8 Temperature Adjusting Means 30 Refrigeration Cycle 31 Compressor 50 Filter 51 Guide 53 Storage Space 55 Humidity Sensor (Humidity Detecting Means) 66 Temperature Setter (Temperature Setting Means) 68 Economy switch 80 Automatic temperature control means 82 Humidity control means

Front page continued (72) Inventor Sugimitsu, 1-1, Showa-cho, Kariya city, Aichi prefecture, Nihon Denso Co., Ltd. (72) Inventor, Nao Tanaka, 1-1, Showa-cho, Kariya city, Aichi prefecture, Nihondenso Co., Ltd.

Claims (5)

[Claims] 1. A duct for forming an air passage for blowing air into a vehicle compartment, (b) a blower for generating an air flow toward the vehicle compartment in the duct, and (c) in the duct. Cooling means provided for cooling the air, and (d) in the duct upstream of the cooling means from the air,
And a filter disposed over the entire surface of the duct to purify air passing through the duct, and (e) air disposed in the duct between the filter and the cooling means and flowing in the duct. An air conditioner for a vehicle, comprising: humidity detecting means for detecting the humidity of (1); and (f) humidity controlling means for operating the cooling means based on the humidity detected by the humidity detecting means. 2. The air conditioner for a vehicle according to claim 1, wherein the filter is supported in the duct by a guide that is a frame, and the guide has air that has passed through the filter downstream of the filter. An air conditioner for a vehicle, comprising: a storage space in which the air flows; and the humidity detecting means is disposed in the storage space. 3. The vehicle air conditioner according to claim 1, wherein the cooling unit is an evaporator of a refrigeration cycle, and the humidity control unit is the refrigeration cycle when the humidity detected by the humidity detection unit is equal to or higher than a predetermined humidity. An air conditioner for a vehicle, characterized in that the evaporator is operated by operating the compressor. 4. The vehicle air conditioner according to claim 1, wherein the vehicle air conditioner is provided in the duct downstream of the cooling means.
Heating means for heating air; temperature adjusting means for adjusting the amount of air heated by the heating means and a bypass amount bypassing the heating means in the duct downstream of the cooling means; and temperature setting by a user Temperature setting means and automatic temperature control means for controlling the temperature adjusting means so that the temperature in the vehicle compartment is maintained at the temperature set by the temperature setting means. Harmony device. 5. The vehicle air conditioner according to claim 1 or 4, further comprising an economy switch for instructing a user to suppress the operation of the cooling means, and the humidity control means includes the economy switch. A vehicle air conditioner, which is activated when a switch is selected.