JP2000142093A - Air conditioning controller for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle air conditioning controller capable of certainly reducing an occurrence degree of cloudiness on window glass. SOLUTION: This vehicle air conditioner has an outlet air temperature detecting means 25 for detecting an outlet air temperature of a refrigerant evaporator 5; a temperature set means 20A for setting a start temperature Ton and a stop temperature Toff of a refrigerant compressor 7 related to the outlet air temperature according to information on surroundings inside and outside a cabin; a compressor driving control means 20B for driving the refrigerant compressor 7 until the outlet air temperature from the outlet air temperature detecting means 25 becomes not more than the stop temperature Toff after the outlet air temperature becomes more than the start temperature Ton; a cloudiness deciding means 20C for deciding cloudiness occurrence on an inside surface of window glass; and a temperature set change means 20D. When the cloudiness deciding means 20C decides the cloudiness occurrence, the temperature set change means 20D newly sets the stop temperature Toff or the start temperature Ton lower than the stop temperature Toff or the start temperature Ton at the time of the decision of the cloudiness occurrence. The compressor driving control means 20B drives and controls the refrigerant compressor 7 according to the stop temperature Toff or the start temperature Ton newly set by the temperature set change means 20D, after the cloudiness occurs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air-conditioning control device capable of performing fog prevention control.

[0002]

2. Description of the Related Art Conventionally, a cooling system having a compressor for compressing a refrigerant driven by a driving force of an engine and an evaporator for dehumidifying and cooling air sent into a vehicle cabin by exchanging heat with the refrigerant compressed by the compressor. An intake door that has a cycle and adjusts the introduction ratio of outside air from outside the vehicle and inside air from inside the cabin that is taken into the air conditioning duct, and the intake door adjusts the introduction ratio of inside and outside air into the duct. There is a vehicle air-conditioning control device including a blower fan that blows introduced air through a evaporator and blows air into a vehicle interior.

[0003] In such a vehicle air-conditioning control apparatus, in winter when the set temperature in the cabin adjusted by the occupant becomes higher than the cabin temperature or the outside air temperature, the heating performance is ensured and the fuel consumption is reduced. In order to achieve powering, the compressor is driven only when the outlet air temperature of the evaporator is higher than a predetermined temperature, and in summer when the set temperature in the cabin becomes lower than the cabin temperature or the outside air temperature. ,
2. Description of the Related Art There is known a technique in which a compressor is driven even when an outlet air temperature of an evaporator is low in order to ensure cooling performance.

However, the compressor is driven only when the outlet air temperature of the evaporator is high in winter when the set temperature in the cabin adjusted by the occupant becomes higher than the cabin temperature or the outside air temperature. In this case, there is a problem that the humidity in the vehicle interior increases and fogging occurs on the inner surface of the window glass. That is, in the conventional technology,
In winter, when the set temperature in the cabin is higher than the cabin temperature or the outside air temperature, the compressor is started when the evaporator outlet air temperature exceeds a preset reference temperature (starting temperature), and the evaporator outlet air temperature Stops the compressor when the temperature exceeds a preset reference temperature (stop temperature). However, since the prevention of fogging on the inner surface of the window glass is not taken into consideration, the humidity in the vehicle interior increases. Then, fogging sometimes occurred on the inner surface of the window glass.

In order to solve such a problem, when fogging occurs on the inner surface of the window glass, the starting temperature and the stopping temperature required for starting and stopping the above-mentioned compressor are reduced to reduce the air passing through the evaporator. Techniques have been developed to improve the dehumidifying capacity by cooling to reduce the humidity in the vehicle interior and eliminate fogging on the inner surface of the window glass. It is disclosed in Japanese Patent Publication No. Hei 6-98891.

[0006]

However, in the above-mentioned prior art, only when it is determined that the inner surface of the window glass is fogged, the compressor is driven and controlled based on the reduced stop temperature. After the fogging is removed, the compressor is driven only when the outlet air temperature of the evaporator is high again, so that the humidity in the vehicle compartment may increase and fogging may occur again under the same conditions. In other words, in the above-described conventional technology, there is a problem that the fogging removal control is only performed and no measures are taken to prevent the fogging from occurring.

The present invention has been made in view of the above circumstances, and has as its object to provide a vehicle air-conditioning control device capable of reliably reducing the degree of fogging of a window glass.

[0008]

In order to achieve the above object, the present invention provides a refrigerant compressor for compressing and discharging a sucked refrigerant, and a refrigerant compressor disposed in an air conditioning duct. An outlet for detecting the outlet air temperature of the refrigerant evaporator, comprising a cooling cycle having a refrigerant evaporator for dehumidifying and cooling the air sent into the vehicle cabin by heat exchange with the low-temperature and low-pressure refrigerant supplied by the operation of the compressor. Air temperature detecting means, temperature setting means for setting a start temperature and a stop temperature of the refrigerant compressor with respect to the outlet air temperature based at least on environmental information inside and outside the vehicle interior, and outlet air from the outlet air temperature detecting means A compressor drive control means for driving the refrigerant compressor until the temperature becomes lower than or equal to the stop temperature when the temperature becomes higher than the start temperature; And cloudy judgment means to determine the occurrence,
Each time the occurrence of the fogging is determined by the fogging determining means, the temperature setting change means for changing the setting so that the stop temperature is lower than the stop temperature when the occurrence of the fogging is determined, The compressor drive control means drives and controls the refrigerant compressor based on the stop temperature changed by the temperature setting change means after the occurrence of fogging.

Therefore, every time fogging occurs on the inner surface of the window glass, the stop temperature of the refrigerant compressor with respect to the outlet air temperature of the refrigerant evaporator is changed to a lower side, and the refrigerant is changed in accordance with the changed stop temperature. Since the drive of the compressor is controlled, each time the fogging occurs on the inner surface of the window glass, the drive area of the refrigerant compressor is expanded stepwise, and the dehumidifying capacity of the refrigerant evaporator is gradually increased, Humidity in the vehicle interior is gradually reduced, and fogging is less likely to occur.

Further, in the present invention (claim 2), every time the fogging is judged by the fogging judging means, the starting temperature is set lower than the starting temperature when the occurrence of fogging is judged. And after the occurrence of fogging, the drive of the refrigerant compressor is controlled based on the starting temperature changed by the temperature setting changing means.

Therefore, every time the inner surface of the window glass becomes cloudy, the starting temperature of the refrigerant compressor with respect to the outlet air temperature of the refrigerant evaporator is also changed to a lower side, and the refrigerant is changed according to the changed starting temperature. Since the drive of the compressor is controlled, every time the fogging occurs on the inner surface of the window glass, the drive area of the refrigerant compressor is gradually expanded, and the dehumidifying capacity of the refrigerant evaporator is gradually increased, Humidity in the vehicle interior is gradually reduced, and fogging is less likely to occur.

Further, according to the present invention (claim 3), while the occurrence of fogging is judged by the fogging judging means, the demist control for increasing the air distribution ratio to the defroster outlet is performed, and the refrigerant compressor and the inside and outside are controlled. It is characterized in that fog removal control is performed in which at least one of the air switching means is drive-controlled so that fogging is eliminated. Accordingly, when fogging occurs on the inner surface of the window glass, the ratio of air distribution to the defroster outlet is increased, and at least one of the refrigerant compressor and the inside / outside air switching means is driven and controlled to eliminate fogging. Therefore, the fogging generated on the inner surface of the window glass is quickly and reliably eliminated.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be illustratively described in detail below with reference to the drawings. FIG.
1 is a schematic diagram showing a vehicle air-conditioning control device 1 to which the present invention is applied. As shown in FIG. 1, on the upstream side in the ventilation duct (air conditioning duct) 2, the introduction ratio of the outside air taken into the duct 2 from the outside of the vehicle and the inside air from the vehicle interior (inside air introduction ratio). Door (inside / outside air switching means) variably switched so as to be able to adjust the pressure, and a blower fan (blowing means) for introducing air into the duct 2 through the intake door 4 to blow air into the vehicle interior. An evaporator (refrigerant evaporator) 5 for dehumidifying and cooling the air blown into the vehicle interior, and a heater core (heating means) for heating the air blown into the vehicle interior are provided downstream of the blower fan 3. ) 6 are provided.

The evaporator 5 constitutes a cooling cycle together with a compressor (refrigerant compressor) 7, a condenser 8, a receiver tank 9, and an automatic expansion valve 10. In this cooling cycle, a compressor 7 driven by a traveling engine 12 of a vehicle via an electromagnetic clutch 11 and a condenser 8 which condenses and liquefies the high-temperature and high-pressure refrigerant compressed by the compressor 7 by receiving air from a cooling fan.
And a receiver 9 for temporarily storing the refrigerant condensed by the condenser 8 and flowing only the liquid refrigerant, an expansion valve 10 for decompressing and expanding the liquid refrigerant guided from the receiver 9, and an expansion valve disposed in the duct 2. The low-temperature and low-pressure refrigerant decompressed at 10 is constituted by functional components such as an evaporator 5 that receives and blows air from the blower fan 3, and is connected in a ring by refrigerant pipes.

The compressor 7 is driven by transmitting a driving force from the engine 12 and stopped when the driving force from the engine 12 is cut off. Further, the compressor 7 includes a rotation speed switching control unit 211, and the rotation speed switching control unit 211
Thus, the number of rotations is controlled. The heater core 6 is interposed in a warm water cycle in which engine cooling water circulates, and heats air passing through the heater core 6.

An air mixing door 13 is provided in a passage between the evaporator 5 and the heater core 6, and the hot air passing through the heater core 6 and the cold air bypassing the heater core 6 according to the opening of the air mixing door 13. Is adjusted. At the downstream end of the ventilation duct 2 from the heater core 6, mode switching doors 18 and 19, a face air outlet 14, a foot air outlet 15, and a defroster air outlet 16 opened at predetermined positions in a vehicle compartment 17, respectively. The mode switching doors 18 and 19 are used to switch the blowing mode from the outlets 14, 15 and 16 branched from each other.

As shown in FIG. 1, input terminals of a control unit (air conditioning control means) 20 of the microcomputer are provided with an inside air sensor 21 and an outside air sensor 22 for detecting temperatures at predetermined positions inside and outside the vehicle compartment 17, respectively. A solar radiation sensor 23 for detecting the amount of solar radiation, a potentiometer 24 for detecting the degree of opening of the air mix door 12, and an evaporator temperature sensor attached to the downstream side of the evaporator 5 to detect the actual outlet air temperature of the evaporator ( Signals from an outlet air temperature detecting means 25 and a fogging detection sensor 26 for detecting fogging on the inner surface of the window glass are input via an A / D converter (not shown). In addition,
The temperature inside and outside the vehicle interior and the amount of solar radiation into the vehicle interior correspond to the environmental conditions inside and outside the vehicle interior, and the inside air sensor 21, the outside air sensor 22, and the solar radiation sensor 23 detect the environmental conditions inside and outside the vehicle interior and output this environmental information. It can be referred to as environmental situation detecting means.

As shown in the top view of FIG. 3 (a) and the perspective view of FIG. 5, the fogging detection sensor 26 has a body formed in a substantially U-shape in a top view, and a side view in FIG. 3 (b). As shown in FIG. 7, a light emitting element 42 is provided on one side piece 41a of the body, and a light receiving element 43 is provided on the other side piece 41b of the body. 45 and the like.

On one side piece 41a, a light emitting surface 41d is provided so as to be perpendicular to the glass 44, and the pulse light A in a predetermined wavelength region from the light emitting element 42 passes through the window glass 44 so as to pass through the light emitting surface 41d. Projected toward the inside surface of the The light quantity of the scattered light B scattered by the pulse light A hitting a water droplet attached to the inner surface of the window glass 44 is changed to a light receiving surface 4 provided on the other side piece 41 b so as to be perpendicular to the glass 44.
The light is detected by the light receiving element 43 through 1e.

As shown in FIG. 4, the light receiving element 43 generates a voltage having a waveform in accordance with the amount of received light, and this voltage is converted into a pulse signal by a high-pass filter and output. When the pulse signal is equal to or more than the predetermined value a, it is determined that the inner surface of the window glass is fogged, and a fogging signal is output to the control unit 40.
In the fogging detection sensor 26, a light-shielding tape 46 (shown with diagonal lines in FIG. 3) on which a reflection process is performed is affixed to a detection surface 46a on the inner surface of the window glass 44, and direct incidence of sunlight is performed. And a change in sensor output due to sunlight can be suppressed. Further, the pulse light A from the light emitting element 42 is projected on the detection surface of the window glass 44 through a light emitting surface 41d perpendicular to the window glass 44,
The scattered light B scattered by hitting a water drop on the detection surface 46a passes through the light receiving surface 41e perpendicular to the window glass 44, and the light receiving element 43
And the sensor itself is formed in a substantially U-shape in a top view, so that maintenance such as cleaning of the light emitting surface 41d, the light receiving surface 41e, and the detection surface 46a can be easily performed. It has become.

As shown in FIG. 5, the fogging sensor 26 is configured to be covered by a cover member 47 over the entire area except for the window glass 44 side, and is affected by reflected light of sunlight from an instrument panel or the like. While reducing
Adhesion of dust and the like to the light emitting surface 41d, the light receiving surface 41e, and the detection surface 46a can be prevented, and fogging can be detected more reliably.

Therefore, the fogging sensor 26 configured as described above can accurately and reliably detect the fogging on the inner surface of the window glass 44. To each output terminal of the control unit 20, an intake door actuator 31 for controlling the opening degree of the intake door 4, a mix door actuator 32 for controlling the opening degree of the mix door 13, and the mode switching doors 18 and 19 are switched to blow out. Mode actuator 3 for switching modes
3, a blower drive circuit 34 for controlling the on / off of the blower fan 3 and its air flow value, and a clutch control circuit 35 for controlling the on / off of the electromagnetic clutch 11 for transmitting or interrupting the driving force from the engine 12 to the compressor 7. Each is connected.

The control unit 20 is configured to receive a signal from a switching means 30 for switching the operating state of the vehicle air-conditioning control device by an occupant. The switching means 30 includes an ON switch 50 and an OFF switch 51 of the air-conditioning control device, an air outlet switch 52 for selecting an air outlet, an air volume switch 53 for adjusting the air volume from the air outlet, a vehicle interior as shown in FIG. A set temperature adjustment switch (target environment state setting means) 54 for setting the set temperature (target environment state) Ts, an inside / outside air changeover switch 55 for switching between outside air introduction and inside air introduction, and an automatic control mode for automatically controlling the air conditioning control device. An auto switch 56 and the like for selection are provided. Note that FIG.
The middle and air volume switches 53 are provided with three switches of L, M and H. L is a switch for setting a low air volume, M is a switch for setting a medium air volume, and H is a switch for setting a high air volume.

When the automatic control mode is selected with the auto switch 56 turned on, the vehicle interior temperature Tr from the inside air sensor 21, the outside air temperature Ta from the outside air sensor 22, and the amount of solar radiation from the insolation sensor 23. The drive control of the compressor 7 and the blower 3 and the control of the intake door 4 and the mix door 13 are performed in accordance with environmental information inside and outside the vehicle such as R and a set temperature Ts as a target environmental state set by the set temperature adjustment switch 54. The opening degree control and the blowing mode switching control of the mode switching doors 18 and 19 are all automatically performed.

When the auto switch 56 is off and the automatic control mode is not selected, the drive control of the compressor 7 and the blower 3, the opening control of the intake door 4 and the mix door 13, the mode switching door 1
Switching means 3 among the blowing mode switching controls 8 and 19;
0 is controlled based on a manual operation by the occupant, and control is performed based on a manual operation. If the manual switching adjustment is not performed, the vehicle interior temperature Tr, the outside air temperature Ta, and the solar radiation amount R are set in the same manner as in the automatic control mode. It is controlled in accordance with environment information such as the target environment state set by the set temperature adjustment switch 54 as the set temperature Ts.

Further, while the air conditioner is operating with the ON switch 50 of the switching means 30 being ON, the compressor 7 keeps the vehicle interior temperature Tr, the outside air temperature Ta, the solar radiation R, the set temperature Ts and the like. Drive control is carried out based on this. Therefore, the control unit 20 stores the vehicle interior temperature T
The ON temperature (starting temperature) Ton and OFF of the compressor 7 with respect to the outlet air temperature based on environmental information such as r, the outside air temperature Ta, the amount of solar radiation R, and the set temperature Ts, and the target environmental state.
The function (temperature setting means) 20A for setting the temperature (stop temperature) Toff and the outlet air temperature detected by the evaporator temperature sensor (outlet air temperature detection means) 25 become higher than the starting temperature until the temperature becomes equal to or lower than the stop temperature. And a function (compressor drive control means) 20B for controlling the compressor 7 to be driven.

Further, a function (fogging determining means) 20C for determining whether or not fogging has occurred on the inner surface of the window glass based on the detection signal of the fogging sensor 26 is provided in the control unit 20. The means 20A has a function of changing the setting such that the stop temperature is set lower than the stop temperature when the occurrence of fogging is determined each time the occurrence of fogging is determined by the fogging determining means 20C (temperature setting changing means). ) 20D.

After the occurrence of fogging, the compressor drive control means 20B drives the compressor 7 based on the ON temperature (start temperature) Ton and the OFF temperature (stop temperature) Toff set and changed by the temperature setting change means 20D. Control. In detail, in the compressor drive control means 20B, the compressor 7 controls the outlet air temperature Te of the evaporator 5 to the ON temperature (starting temperature) set according to the temperature control amount S as shown by the dotted line in FIG. 8) When the temperature becomes larger than Ton, the motor is driven, and as shown by the solid line in FIG. 8, the OFF temperature (stop temperature) T set according to the temperature control amount S.
It is configured to stop when it becomes less than off.

The temperature control amount S is calculated based on the vehicle interior temperature Tr, the outside air temperature Ta, the insolation R, the set temperature Ts, and the like, as in the following equation (1). S = f (Ta, Tr, Ts, R) (1) The above equation (1) is a so-called outside air feed forward equation, and is specifically represented by the following equation (2), for example. Things.

S = (Ts−Tr) · Gp + (Ts−Ta) · Gp · A + R (2) where Ts, Tr, Ta, and R are a set temperature, a room temperature, an outside air temperature, and an amount of solar radiation, respectively. Where Gp is a gain and A is a preset constant. The amount of solar radiation R plays a role as a correction value. In the above equation (1), the engine speed Ne, the vehicle speed information V from the vehicle speed sensor,
If the information from the inside / outside air mode sensor and the air mix damper opening sensor is included as a parameter, the accuracy of the temperature control amount S can be further improved.

The temperature control amount S is determined by the gain Gp or the constant A
, The room temperature Tr and the outside air temperature Ta are equal to the set temperature Ts.
It becomes a small value in summer when it becomes higher than the room temperature Tr.
It becomes a large value in winter or when the outside air temperature Ta becomes lower than the set temperature Ts. ON temperature Ton and OFF temperature Tof
As shown by the dotted line and the solid line in FIG. 8, f decreases as the temperature control amount S decreases, that is, as the room temperature Tr and the outside air temperature Ta become higher than the set temperature Ts by the temperature setting unit 20A. It is set as follows.

Specifically, the OFF temperature To shown by a solid line in FIG.
In the case of ff, the OFF temperature Toff is equal to the predetermined temperature Toff when the temperature control amount S is equal to or more than the predetermined value S1.
When the temperature control amount S is set to 0 and is smaller than the predetermined value S1 and larger than the predetermined value S2 (<S1), as the temperature control amount S decreases, the temperature Toff0 to the predetermined temperature Toff1 (<Toff0). It is set to decrease proportionally so that The temperature control amount S is equal to a predetermined value S.
If it is less than or equal to 2 and greater than a predetermined value S3 (<S2), it is set to a predetermined temperature Toff1 and the temperature control amount S is set to a predetermined value S
When the temperature control control amount S is smaller than 3 and is larger than a predetermined value S4 (<S3), the temperature is set to be proportionally decreased from the predetermined temperature Toff1 to a predetermined temperature Toff5 (<Toff1) as the temperature control amount S decreases. . When the temperature control amount S is equal to or less than the predetermined value S4, the temperature is set to the predetermined temperature Toff5.

As shown by a dotted line in FIG. 8, the ON temperature Ton is more than the OFF temperature Toff by a predetermined amount α.
And is set so as to decrease stepwise as the temperature control amount S decreases as in the case of the OFF temperature Toff. Thus, the compressor 7 is turned on and off.
ON at the outlet air temperature Te of the evaporator 5
By setting the temperature Ton and the OFF temperature Toff to smaller values as the temperature control amount S decreases, the room temperature Tr and the outside air temperature Ta are lower than the set temperature Ts, and the temperature control amount S is calculated to be large. During the winter, the compressor 7 is not driven unless the outlet air temperature Te of the evaporator 5 becomes high, so that the driving rate of the compressor 7 is reduced, and the deterioration of fuel efficiency due to the driving of the compressor 7 can be suppressed. Evaporator 5 by
The cooling of the air passing through the vehicle interior is suppressed, and the heating performance of the vehicle interior can be ensured.

In summer when the room temperature Tr and the outside air temperature Ta are higher than the set temperature Ts and the temperature control amount S is calculated to be small, the evaporator 5 is driven even when the outlet air temperature Te is low. Therefore, the driving rate of the compressor 7 is increased, the cooling performance of the air passing through the evaporator 5 by the driving of the compressor 7 can be improved, and the cooling performance in the vehicle cabin can be ensured.

Further, the ON temperature Ton is changed to the OFF temperature Tof.
By setting the value larger than f by a predetermined amount α,
Hunting can be reliably prevented from occurring in the drive control of driving and stopping the compressor 7. Although the ON temperature Ton and the OFF temperature Toff are set so as to gradually decrease as the temperature control amount S decreases, the present invention is not limited to this. For example, the ON temperature Ton and the OFF temperature Toff may be linear (proportional). May be set to decrease.

Also, the ON temperature Ton and the OFF temperature Ton
Although ff has been described to be set according to the temperature control amount S, the invention is not limited to this.
It may be set according to a. In this case, O
The N temperature Ton and the OFF temperature Toff may be set so as to decrease as the outside air temperature Ta increases. Also,
When the fogging determining means 20C determines that fogging has occurred on the inner surface of the window glass, fogging control is performed by the compressor drive control means 20B of the control unit 20 or the like.

In this defrosting control, a defroster signal is output to the mode actuator 33 to perform demist control for switching the outlet mode to the defroster, and an outside air signal is output to the intake door actuator 31 to drive the intake door 4. The outside air introduction state, that is, the inside air introduction rate is set to 0%, and the ON temperature Ton and the OFF temperature Toff of the compressor 7 are changed to the minimum ON temperature Ton5 and the minimum OFF temperature Toff which are the minimum temperatures.
5, and the compressor 7 is driven.

That is, in order to quickly remove the fog,
ON temperature Ton and OFF temperature Tof of the compressor 7
f, the minimum ON temperature Ton5 and the minimum O
By changing to the FF temperature Toff5, the drive range of the compressor 7 is expanded, a clutch ON signal is output to the clutch drive circuit 35, and the electromagnetic clutch 11 is connected to drive the compressor 7 by the power from the engine, thereby speeding up the operation. Will be fogged.

Further, an UP signal is output to the blower drive circuit 34 to increase the air volume of the blower so that fog can be removed more quickly. Next, the control outline of the vehicle air conditioner according to the present embodiment will be described with reference to FIGS. FIG. 6 is a main flowchart in the present embodiment.

First, when the air conditioner ON switch 50 and the auto switch 56 of the switching means 30 are switched to the ON state and the air conditioning control device is operated, the flag F is set to 0 in step S1, and the process proceeds to step S2. . This flag F is set to 1 when the setting has been changed so that the OFF temperature Toff of the compressor 7 described later is lowered.
Is set.

In step S2, the outside air temperature Ta detected by the outside air sensor 22 is set to a predetermined value Ta0 (for example, 10 °).
It is determined whether it is smaller than C). If the determination result in step S2 is affirmative, that is, if the outside air temperature Ta is smaller than the predetermined value Ta0, the process proceeds to step S3. In step S3, low-temperature start-up air conditioning control is performed. In this low-temperature start-up air conditioning control, the control unit 20 takes the intake air so that the introduction ratio of the inside / outside air is 100%, and the compressor 7 is stopped (OFF). A control signal is output to the door actuator 31 and the clutch drive circuit 35. Further, the control unit 20 controls the target environment state and the internal air temperature Tr from the internal air sensor 21 and the external air sensor 22 from the external air sensor 22 so that the target environmental state such as the set temperature Tr set by the occupant by the switching means 30 is set. In accordance with environmental information inside and outside the vehicle such as the outside air temperature Ta and the amount of solar radiation R from the solar radiation sensor 23, the air volume of the blower 3, the opening of the mix door 13, and the blowing mode switched by the mode switching doors 18 and 19 are set. Then, a control signal corresponding to each setting is output to the blower driving circuit 34, the mixed door actuator 32, and the mode actuator 33.

Therefore, in this low-temperature start-up air conditioning control, the introduction of outside air is shut off and the driving of the compressor 7 is stopped, so that the heating performance is ensured and quick air conditioning control is performed. In addition, the air volume of the blower 3, the opening of the mix door 13, and the blowing mode by the mode switching doors 18 and 19 are controlled so that the occupant enters the target environmental state such as the set temperature Tr set by the switching means 30 for switching adjustment. Therefore, optimal air-conditioning control is performed.

When the low-temperature start-up air-conditioning control in step S3 is performed, the process proceeds to step S4, and it is determined whether or not fogging has occurred on the inner surface of the window glass 44 based on the detection signal from the fogging sensor 26. If the determination in step S5 is affirmative and it is determined that fogging has occurred on the inner surface of the window glass 44, the fogging operation in step S10 described below is performed.

If the determination in step S4 is negative, the process proceeds to step S5, where it is determined whether or not the temperature Tw of the engine cooling water is higher than a predetermined temperature Tw0. The predetermined temperature Tw0 is a temperature at which it is determined that the heating performance has been secured by the rise in the cooling water temperature, and is, for example, a temperature at which the thermostat is opened. If the determination in step S5 is negative, the process returns to step S3, and the above-described low temperature startup air conditioning control is repeated.

Therefore, when the air conditioner is started, the outside air temperature T
When the temperature a is lower than the predetermined value Ta0, the window glass 44
Until the inside surface becomes cloudy or the engine cooling water becomes higher than the predetermined temperature Tw0, the inside air introduction state in which the inside air introduction rate becomes 100% and the low-temperature start-up air conditioning control in which the compressor 7 is stopped are performed. As a result, ensuring the heating performance of the cabin is improved,
When the engine is started, the temperature of the cooling water is increased earlier, so that fuel efficiency is improved.

If the cooling water temperature Tw becomes higher than the predetermined value Tw0 during the low-temperature start-up air-conditioning control and the determination in step S5 becomes affirmative, step S6 is performed.
To the outside air introduction state (outside air mode) where the inside air introduction rate becomes 0%, and the intake door actuator 31
Then, a control signal is output so that the inside air introduction rate becomes 0%, and the intake door 4 is driven to cut off the inside air introduction.

When the switching control to the outside air mode in step S6 is performed, the process proceeds to step S7, and it is determined whether or not the flag F is 0. Further, when it is determined in step S2 that the outside air temperature Ta at the time of starting the air conditioner is equal to or higher than the predetermined value Ta0, the process proceeds to step S7, and it is determined whether the flag F is 0.

This flag F is set to 0 when the outside air temperature Ta is equal to or higher than the predetermined value Ta0 when the air conditioner is started, and when the low temperature start-up air-conditioning control is performed immediately after the start of the air conditioner.
In such a case, the determination in step S7 is affirmative, and the process proceeds to step S8, where normal air conditioning control is performed. In the ordinary air conditioning control in step S8, the air outlet switch 52
In the case where the occupant is manually adjusted by the air volume switch 53 and the inside / outside air changeover switch 55, the set temperature Ts set by the set temperature adjustment switch 54 so that the manually adjusted state is obtained and the vehicle interior temperature Tr is set by the set temperature adjustment switch 54. When the auto mode is selected by the auto switch 56, the inside temperature Tr, the outside temperature Ta, and the outside temperature Ta are set so that the vehicle interior temperature Tr becomes the set temperature Ts set by the set temperature adjustment switch 54. Solar radiation R
Switching means 3 for indicating an input signal from each sensor indicating environmental information inside and outside the vehicle interior such as a vehicle and a target environmental state such as a set temperature Ts.
In response to various input signals from the respective switches of 0, the blowing mode, the amount of air blown from the outlet, the temperature of the blown air, the introduction of inside and outside air, and the like are set.

Then, the clutch drive circuit 35, the rotation speed control means 211, the intake door actuator 31, and the blower drive are set so that the set blowing mode, the amount of air blown from the air outlet, the temperature of the blown air and the inside / outside air are introduced. A control signal is output to each of the circuit 34, the mixed door actuator 32, and the mode actuator 33,
Air conditioning control is performed optimally.

The driving of the compressor 7 is controlled in accordance with the flowchart of the compressor driving control shown in FIG. First, in step C1, the above-mentioned temperature control amount S is obtained from the room temperature Tr, the outside air temperature Ta, the solar radiation amount R, the set temperature Ts, and the like input from the inside air sensor 21, the outside air sensor 22, the solar radiation sensor 23, and the set temperature switch 54. calculate.

Next, the routine proceeds to step C2, where the ON temperature To is set.
n and the OFF temperature Toff are extracted from the drive control map shown in FIG. 8 based on the temperature control amount S obtained in step C1. The ON temperatures Ton and O in this normal air conditioning control
The FF temperature Toff is extracted from the ON temperature Ton set as indicated by the dotted line in FIG. 8 and from the OFF temperature Toff set as indicated by the solid line in FIG. The OFF temperature Toff is extracted.

Next, the routine proceeds to step C3, where it is determined whether or not the outlet air temperature Te detected by the evaporator temperature sensor 25 is higher than the OFF temperature Toff extracted in step C2. Outlet air temperature Te becomes OFF temperature Tof
If it is higher than f and the determination in step C3 is affirmative, the process proceeds to step C4, where it is determined whether or not the outlet air temperature Te is higher than the ON temperature Ton extracted in step C2.

If the outlet air temperature Te is higher than the ON temperature Ton and the determination in step C4 is affirmative, the process proceeds to step C5, in which the compressor 7 is set to a driving state.
At this time, a clutch ON signal is output to the clutch drive circuit 35. If the determination in step C4 is negative, the process proceeds to step C6, where it is determined whether the compressor 7 is currently being driven. The determination in step C6 is affirmative, that is, the outlet air temperature Te of the evaporator 5 becomes the OFF temperature Toff.
If the ON temperature is higher than the ON temperature and the compressor 7 is being driven, the process proceeds to step C5, and the driving state of the compressor 7 is maintained.

If the determination in step C3 is negative, that is, if the outlet air temperature Te of the evaporator 5 is equal to or lower than the OFF temperature Toff, the routine proceeds to step C7, where the compressor 7
Is set to the stop state. At this time, the clutch drive circuit 35
To output a clutch OFF signal. Step C6
Is negative, that is, the outlet air temperature T of the evaporator 5
If e is higher than the OFF temperature Toff and equal to or lower than the ON temperature and the compressor 7 is in the stopped state, the process proceeds to step C7, and the stopped state of the compressor 7 is maintained.

After proceeding to steps C5 and C7, the process returns. In this compressor drive control, when the drive state or the stop state of the compressor 7 is set, the control unit 20 outputs a clutch ON signal or a clutch OFF signal to the clutch drive circuit 35, and the clutch drive circuit 35 The compressor 7 is driven or stopped by engaging or disengaging the electromagnetic clutch 11 according to a clutch ON signal or a clutch OFF signal.

Therefore, the outlet air temperature Te of the evaporator 5 is determined based on the ON temperature T extracted based on the temperature control amount S.
OFF temperature T which is similarly extracted when it becomes larger than on
The compressor 7 is driven and the air in the duct 2 is cooled and dehumidified by the evaporator 5 until the pressure becomes off or less. As described above, in the normal air-conditioning control, as shown by the dotted line and the solid line in FIG. 8, the ON temperature To which is set so as to gradually decrease as the temperature control amount S decreases.
n and ON temperature To extracted from OFF temperature Toff
Since the drive of the compressor 7 is controlled based on the n and the OFF temperature Toff, as described above, in winter, when the room temperature Tr and the outside air temperature Ta become lower than the set temperature Ts and the temperature control amount S is calculated to be large. Is the evaporator 5
If the outlet air temperature Te of the compressor 7 is not high, the compressor 7 will not be driven, the driving rate of the compressor 7 will be reduced, and the deterioration of fuel efficiency due to the driving of the compressor 7 can be suppressed. Thus, the cooling of the generated air is suppressed, and the heating performance of the vehicle interior can be ensured.

In summer, when the indoor temperature Tr and the outside air temperature Ta are higher than the set temperature Ts and the temperature control amount S is calculated to be small, the outlet air temperature T of the evaporator 5 is calculated.
e is also driven when e is low, the driving rate of the compressor 7 is increased, the cooling of the air passing through the evaporator 5 by the driving of the compressor 7 can be improved, and the cooling performance in the passenger compartment is ensured. Can be.

Next, when the normal air-conditioning control in step S8 is performed, the process proceeds to step S9, where the fogging sensor 2
From the output from 5, it is determined whether or not fogging has occurred on the inner surface of the window glass 44. If the determination in step S9 is negative and there is no fogging on the inner surface of the window glass 44, the process returns to step S8, and the above-described normal air conditioning control is repeated.

If the determination in step S9 is affirmative and it is determined that fogging has occurred on the inner surface of the window glass 44, the process proceeds to step S10, and a fogging operation is performed. In the fogging operation in step S10, a defroster signal is output to the mode actuator 33, and demist control for switching the outlet mode to the defroster is performed. In addition, an outside air signal is output to the intake door actuator 31 to drive the intake door 4 so that the outside air is introduced,
That is, the inside air introduction rate is set to 0%, and the ON temperature Ton and the OFF temperature Toff of the compressor 7 are changed to the minimum ON temperature Ton5 and the minimum OFF temperature Ton which are the minimum temperatures.
ff5 and fog removal control for driving the compressor 7 is performed.

That is, in order to quickly remove the fog,
ON temperature Ton and OFF temperature Tof of the compressor 7
f, the minimum ON temperature Ton5 and the minimum O
By changing to the FF temperature Toff5, the drive range of the compressor 7 is expanded, a clutch ON signal is output to the clutch drive circuit 35, and the electromagnetic clutch 11 is connected to drive the compressor 7 by the power from the engine, thereby speeding up the operation. Will be fogged.

Further, by outputting an UP signal to the blower driving circuit 34 and increasing the air volume of the blower, the fog can be removed more quickly. Note that an example has been described in which the ON temperature Ton and the OFF temperature Toff are changed so as to be the minimum temperatures Ton5 and Toff5 irrespective of the temperature control amount S. However, as shown by the two-dot chain line and the one-dot chain line in FIG. The minimum temperature is controlled so that the temperature control amount S becomes the minimum temperature in a range larger than the predetermined value S2, that is, in the range not less than the predetermined value S1, the minimum ON temperature Ton5 and the minimum OFF temperature Toff.
5, in a range smaller than the predetermined value S1 and larger than the predetermined value S2, the value (Ton5, Tof) at the predetermined value S1.
f5) and the value (Ton1, Toff) at the predetermined value S2
1) may be changed so as to change proportionally.
In addition, the example in which the compressor 7 is driven by changing the ON temperature Ton and the OFF temperature Toff of the compressor 7 has been described. However, during the fogging, the compressor 7 is forcibly irrespective of the outlet air temperature Te of the evaporator 5. May be driven.

Therefore, when fogging occurs on the inner surface of the window glass 44, only the outside air having a lower temperature than the inside air is introduced, and the outside air is dehumidified by the dehumidifying action of the evaporator 5 driven by the compressor 7, and the dehumidified air is removed. As the air is blown out of the defroster, the humidity near the inner surface of the window glass 44 decreases, and the internal air temperature near the inner surface of the window glass 44 decreases, and the saturation near the inner surface of the window glass 44 decreases. By increasing the humidity,
The fogging generated on the inner surface of the window glass 44 is quickly eliminated. Furthermore, the cloudiness is eliminated more quickly by increasing the amount of air blown into the vehicle cabin.

In the fogging operation in step S10, the compressor 7 is driven while the outside air is being introduced (the inside air introduction rate is 0%), and the outlet mode is switched to the defroster. However, the present invention is not limited to this. Instead, at least one operation of the outside air introduction state and the compressor drive may be performed, and the outlet mode may be switched to the defroster. For example, when the occupant fixes the inside / outside air changeover switch 55 to the inside air state by manual operation, or when a wiper (not shown) is operating, that is, in the case of rainy weather, only driving of the compressor 7 is performed without setting the outside air introduction state. When the outside air temperature Ta is low and the compressor 7 is not operated, only the switching to the outside air introduction state may be performed. Also in such a case, since air having a lower humidity than the inside air is blown out from the defroster, the fogging generated on the inner surface of the window glass 44 is quickly eliminated.

Next, the process proceeds to step S11, where it is determined from the detection signal from the fogging sensor 26 whether or not the fogging on the inner surface of the window glass 44 has been eliminated. If this determination result is negative, the process returns to step S10, and the fogging operation in step S10 is continued. Step S
When the determination result of step 11 is affirmative, that is, when it is determined by the fogging sensor 26 that the fogging on the inner surface of the window glass has been eliminated, the process proceeds to step S12, and a predetermined time (for example, 60 sec) has elapsed since the fogging was eliminated. Is determined. If this determination result is negative, the process returns to step S10,
The flow after step S10 is repeated. That is, the fogging operation of step S10 is continued until the predetermined time has elapsed even after the fogging is detected by the fogging detection sensor 26.

Therefore, the fogging on the inner surface of the window glass 44 is reliably and promptly eliminated, so that the visibility is improved and the safety is improved. If the result of the determination in step S12 is affirmative, that is, if the fogging has been eliminated and a predetermined time has elapsed, the process proceeds to step S13. In step S13, the fogging operation in step S10 is canceled, and the ON temperature Ton and the OFF temperature Toff of the compressor 7 are changed. This ON temperature Ton and O
As shown in FIG. 8, the setting change of the FF temperature Toff is performed by changing the ON temperature T set when the occurrence of fogging is detected.
The on and off temperatures Toff are decreased so that the temperature control amount S is larger than the predetermined value S2.

More specifically, when the temperature control amount S is equal to or more than the predetermined value S1, the ON state set when fogging occurs is set.
The temperature Ton and the OFF temperature Toff are changed so as to be decreased by a predetermined amount β, and in a range where the temperature control amount S is smaller than the predetermined value S1 and larger than the predetermined value S2, the temperature control amount S is increased from the predetermined value S1 by a predetermined value. As the value decreases to the value S2, the temperature control amount S is changed so as to linearly change from the value at the predetermined value S1 to the set value of the predetermined value S2.

Here, since the fogging occurs during the normal air-conditioning control in step S8, the ON temperature Ton and the OFF temperature Toff are respectively shown in FIG. 8 when the temperature control amount S is equal to or more than the predetermined value S1. As shown by the dotted line and the solid line, the ON temperature Ton0 set in the normal air conditioning control
And the OFF temperature Toff0 is decreased by a predetermined amount β, and Ton1 (= Ton0−β) and Toff1 (= Toff1).
f0−β) and the temperature control amount S is equal to a predetermined value S
In a range smaller than 1 and larger than the predetermined value S2, the setting is changed so that the values (Ton1 and Toff1) at the predetermined value S1 and the set value at the predetermined value S2 are linearly connected.

Even when the low-temperature start-up air-conditioning control in step S3 is being performed, if it is determined in step S4 that fogging has occurred, the process proceeds to steps S10 to S12, and after the fogging is similarly removed. The fogging operation is performed until a predetermined time elapses. Then, step S13
And release the fogging operation and ON temperature Ton
And the setting of the OFF temperature Toff is changed.

In the low temperature start-up air conditioning control, the compressor 7
Is stopped, so that the compressor 7 is turned on.
Although the temperature Ton and the OFF temperature Toff are not set, the ON temperatures Ton and O in step S13 after fogging has occurred during the low-temperature startup air conditioning control.
The setting change of the FF temperature Toff is performed by changing the ON temperature Ton and the OFF temperature Ton set in the normal air conditioning control described above.
ff is reduced by a predetermined amount β in a range where the temperature control amount S is equal to or more than a predetermined value S1, and Ton1 (= Ton0−β) and T
off1 (= Toff0-β), and in a range where the temperature control amount S is smaller than the predetermined value S1 and larger than the predetermined value S2, the value (Ton1) at the predetermined value S1 is set.
And Toff1) and the set value at the predetermined value S2 are set so as to be linearly connected. That is, as described above, the ON temperature Ton and the OFF temperature Toff that are changed after fogging occurs during the normal control are set to the same values.

When the fogging operation is canceled and the setting of the ON temperature Ton and the OFF temperature Toff is changed in step S13, the process proceeds to step S14, and the flag F is set to 1. Thereafter, the process returns to step S7, and the flag F is set to 0.
Is determined. Flag F indicates ON temperature Ton and OF
It is set to 1 when the setting is changed so that the F temperature Toff decreases, and 1 is set in step S14.
, The determination in step S7 is negative and the process proceeds to step S15, where anti-fog air conditioning control is performed.

In the antifogging air-conditioning control in step S15, FIG.
Step C2 in the drive control of the compressor 7 shown in FIG.
Only the extraction of the ON temperature Ton and the OFF temperature Toff is different from the normal air-conditioning control in step S8, and the other controls (the drive control of the blower 3, the drive control of the intake door 4, the opening control of the mix door 13, the blowing out) Mode switching control) is performed similarly to the normal air conditioning control described in step S8.

That is, ON in this anti-fogging air conditioning control
The extraction of the temperature Ton and the OFF temperature Toff is performed based on the ON temperature Ton and the OFF temperature Toff changed in the setting in step S13. Therefore, in this anti-fogging air-conditioning control, the ON temperature Ton and the OFF temperature Toff set when fogging occurs (here, step S
8 ON temperature Ton0 and OFF in normal air conditioning control
From the ON temperature Ton and the OFF temperature Toff whose settings have been changed to be lower than the temperature Toff0).
The on and off temperatures Toff are extracted, and the extracted O
Since the drive of the compressor 7 is controlled based on the N temperature Ton and the OFF temperature Toff, the drive rate of the compressor 7 is increased in a range where the temperature control amount S at which fogging may frequently occur is larger than the predetermined value S2. The cooling and dehumidifying functions of the evaporator 5 driven by the compressor 7
The humidity of the air blown into the cabin from the outlet decreases,
The humidity of the entire vehicle interior is reduced, and the window glass 4
4 is in a state in which fogging hardly occurs on the inner surface.

In the anti-fogging air-conditioning control in step S15, the ON temperature Ton and the O
Although only the method of extracting the FF temperature Toff is described as being different from the normal air-conditioning control described in step S8, the present invention is not limited to this, and the rotation speed of the compressor 7 may be increased with respect to the normal air-conditioning control. It is also possible to set the opening degree of the intake door 4 so as to increase the outside air introduction rate, or to set the air volume of the blower 3 high. In this case, the inner surface of the window glass 44 can be set. Can be further suppressed.

When the antifogging air conditioning control in step S15 is performed, the process proceeds to step S16, and it is determined whether or not the window glass 44 has become fogged based on the detection signal from the fogging sensor 26. If the determination in step S16 is negative and no fogging has occurred, the process returns to step S15 and the anti-fogging air conditioning control is repeated. If the determination in step S16 is affirmative, and it is determined that fogging has occurred on the inner surface of the window glass 44, the process proceeds to steps S10 to S12, and the above-described fogging operation is performed. Then, as described above, the fogging operation is continued until a predetermined time elapses after the fogging is removed, and the process proceeds to step S13.

In step S13, the fogging operation is canceled as described above, and the ON temperature Ton and the OF temperature of the compressor 7 which are set when fogging occurs.
The setting is changed so as to lower the F temperature Toff. In step S13, release of the fogging operation and ON temperature Ton
When the setting of the OFF temperature Toff is changed, the process proceeds to step S14, where the flag F is set to 1 and the process proceeds to step S14.
7, the flow from step S7 is repeated.

Therefore, after that, anti-fogging air-conditioning control in which the compressor 7 is driven and controlled based on the ON temperature Ton and the OFF temperature Toff of the compressor 7 whose settings have been changed so as to further decrease is performed.
And the humidity of the air blown into the passenger compartment from the outlet is reduced by the cooling and dehumidifying functions of the evaporator 5 driven by the compressor 7, and the humidity of the entire passenger compartment is further reduced. As a result, fogging is less likely to occur on the inner surface of the window glass 44.

When fogging occurs on the inner surface of the window glass 44 thereafter, the fogging operation of steps S10 to S12 is performed every time fogging occurs, and the ON temperature Ton and the OF temperature of the compressor 7 are determined in step S13.
The setting is changed so that the F temperature Toff decreases. After that, the ON temperature Ton and the OFF that have been changed
Anti-fogging air conditioning control in which the compressor 7 is drive-controlled based on the temperature Toff is performed.

That is, during the low-temperature start-up air conditioning control in step S3 or the normal air conditioning control in step S8, the window glass 4
When fogging occurs on the inner surface of the compressor 4, the ON temperature Ton and the OFF temperature Toff of the compressor 7 set as shown by the dotted line and the solid line in FIG. Ton1 and Toff1 respectively
In a range smaller than the predetermined value S1 and larger than the predetermined value S2, the predetermined value S1 and the predetermined value S2 are changed.
The setting is changed so that the ON temperature Ton and the OFF temperature Toff in the above are linearly changed. Thereafter, anti-fog air-conditioning control is performed in which the drive control of the compressor 7 is performed based on the changed ON temperature Ton and OFF temperature Toff.

Further, when fogging occurs on the inner surface of the window glass 44, each time the fogging occurs, the ON temperature Ton increases as shown in FIG.
As shown by the two-dot chain line, when the temperature control amount S is equal to or more than the predetermined value S1, Ton2 (= Ton1−β), Ton3
(= Ton2-β),..., Ton5 (= Ton4-
β), the OFF temperature Toff is changed in a stepwise manner so that the OFF temperature Toff is Toff in a range where the temperature control amount S is equal to or more than the predetermined value S1 as shown by a dashed line in FIG.
2 (= Toff1-β), Toff3 (= Toff2-
β),..., Toff5 (= Toff4−β), the setting is changed so as to gradually decrease, and the temperature control amount S is smaller than the predetermined value S1 and larger than the predetermined value S2. ON temperature T at value S1 and predetermined value S2
The setting is changed so that the on and OFF temperatures Toff change linearly.

Then, anti-fogging air-conditioning control in which the compressor 7 is driven and controlled based on the ON temperature Ton and the OFF temperature Toff, which are set so as to decrease step by step whenever fogging occurs, is performed. Become. Therefore, the driving rate of the compressor 7 is gradually increased each time fogging occurs, and the humidity of the air blown into the passenger compartment from the outlet is reduced by the cooling and dehumidifying functions of the evaporator 5 by driving the compressor 7. As the humidity gradually decreases, the humidity of the entire vehicle interior gradually decreases, so that the inner surface of the window glass 44 is less likely to be fogged. It can be suppressed stepwise and reliably, and the degree of fogging is reliably reduced.

Further, the ON temperature Ton and the OF
The setting change such that the F temperature Toff is reduced is suppressed, the deterioration of fuel efficiency due to the drive rate of the compressor 7 being increased more than necessary is suppressed, and unnecessary air due to unnecessary driving of the compressor 7 is suppressed. The heating performance is prevented from being impaired by the cooling of the air conditioner, and the air conditioning control that ensures the heating performance is quickly performed.

Further, the ON temperature Ton of the compressor 7
Further, since the configuration is such that the OFF temperature Toff is gradually reduced each time fogging occurs, the influence on the air conditioning control in the vehicle compartment also changes gradually, so that the uncomfortable feeling given to the occupant can be minimized. In the present embodiment, the setting change of the ON temperature Ton and the OFF temperature Toff of the compressor 7 is performed when the temperature control amount S is equal to or more than the predetermined value S1.
The process is performed until it reaches off5. This minimum ON temperature To
n and the minimum OFF temperature Toff are set to the same values as the ON temperature Ton and the OFF temperature Toff set in a range where the temperature control amount S is smaller than the predetermined value S4, and the minimum OFF temperature Toff5 is determined by the evaporator 5. It is set near the freezing temperature. This is to prevent the evaporator 5 from freezing.

In this embodiment, the minimum ON temperature Ton and the minimum OFF temperature Toff in the range where the temperature control amount S is smaller than the predetermined value S1 and larger than the predetermined value S2.
Is the minimum ON temperature T at the predetermined value S1 of the temperature control amount S.
By setting the on temperature and the minimum OFF temperature Toff5 to be linearly connected to the ON temperature Ton and the OFF temperature Toff at the predetermined value S2, as the temperature control amount S decreases from the predetermined value S1 to the predetermined value S2, That is, the driving rate of the compressor 7 decreases as the outside air temperature increases and the possibility of occurrence of fogging decreases, so that deterioration of fuel efficiency due to unnecessary driving of the compressor 7 is suppressed.

In this embodiment, when the outside air temperature Ta is equal to or higher than the predetermined value Ta0 at the time of starting the air conditioner, step S2
Is negative, the process proceeds to step S7, and since the flag F is 0, the process proceeds to step S8, and the flow from step S8 described above is performed. The operation of the air-conditioning control device according to the above-described flowchart is quickly stopped when the OFF switch 51 of the switching unit 30 is turned ON or an ignition switch (not shown) is turned OFF.

In the vehicle air-conditioning control apparatus according to the above-described embodiment, each time the fogging occurs on the inner surface of the window glass 44, the ON temperature Ton and the OFF temperature Toff of the compressor 7 are changed to the ON temperature when the fogging occurs. The anti-fogging air-conditioning control for controlling the drive of the compressor 7 based on the changed ON temperature Ton and the OFF temperature Toff is changed until the setting is changed to be lower than the Ton and OFF temperature Toff, and thereafter, the fogging occurs. Although the control is performed, the following control can be added.

For example, if fogging does not occur for a long time during the anti-fogging air-conditioning control, the control is returned to the normal air-conditioning control, or the ON temperature Ton and the OFF temperature Toff of the compressor 7 are set.
Can be gradually increased within the range between the ON temperature Ton and the OFF temperature Toff in the normal air-conditioning control. In such a case, since the driving rate of the compressor 7 is reduced, deterioration of fuel efficiency and impairment of heating performance due to driving of the compressor 7 are suppressed.

In this embodiment, the window glass 4
When fogging occurs on the inner surface of compressor 4, O
Although the setting is changed so as to lower both the N temperature Ton and the OFF temperature Toff, the setting may be changed so that only the OFF temperature Toff is changed. Also in this case, the driving rate of the compressor 7 is increased each time fogging occurs, and the occurrence of fogging on the inner surface of the window glass 44 can be suppressed stepwise and reliably, and the degree of fogging is reduced. It will surely be reduced. Also, since the driving rate of the compressor 7 is not increased more than necessary,
Deterioration of fuel efficiency and impairment of heating performance due to driving of the compressor 7 are further suppressed.

In the above-described embodiment, every time the fogging occurs on the inner surface of the window glass 44, the ON temperature Ton of the compressor 7 set when the fogging occurs.
And the OFF temperature Toff when the temperature control amount S is equal to a predetermined value S1
In the above range, the setting is changed so as to decrease by the predetermined amount β, and the temperature control amount S is smaller than the predetermined value S1 and is smaller than the predetermined value S2.
In a larger range, the ON temperature Ton and the OFF temperature Toff at the predetermined value S1 and the predetermined value S2 are configured to be changed so as to be linearly connected to each other, but the present invention is not limited to this. .

For example, the ON temperature Ton is set to the temperature control amount S
Is greater than the minimum ON temperature Ton5 in the range of S1 or more, and the temperature control amount S is smaller than the predetermined value S1 and is smaller than the predetermined value S2.
In the range larger than the predetermined range S1, the OFF temperature Toff is larger than a straight line connecting the minimum ON temperature Ton5 at the predetermined value S1 and the ON temperature Ton at the predetermined value S2, and the temperature control amount S is equal to or more than S1. At least O in the range
In a range higher than the FF temperature Toff5 and the temperature control amount S is smaller than the predetermined value S1 and larger than the predetermined value S2,
If the setting is changed so as to be gradually lowered each time fogging occurs, in a range larger than a straight line connecting the minimum OFF temperature Toff5 at the predetermined value S1 and the OFF temperature Toff at the predetermined value S2 linearly. Good.

In this embodiment, the ON temperature Ton and the OFF temperature of the compressor 7 are limited only in a range where the temperature control amount S at which fogging is likely to occur frequently is larger than the predetermined value S2.
Although the configuration is changed so as to lower the temperature Toff, the present invention is not limited to this. For example, when fogging occurs on the inner surface of the window glass 44, the ON temperatures Ton and O
The setting may be changed so as to lower the FF temperature Toff. However, by limiting the fog to a range where fogging may frequently occur as in the present embodiment, the compressor 7
Is suppressed more than necessary, and deterioration of fuel efficiency and impairment of heating performance due to driving of the compressor 7 are further suppressed.

In the above-described embodiment, the compressor 7
It has been described that the ON temperature Ton and the OFF temperature Toff are set based on the temperature control amount S. However, the present invention is not limited to this. For example, as described above, environmental information inside and outside the vehicle interior such as the outside air temperature Ta is described. May be set based on In this embodiment, the compressor 7 is turned on.
Although the temperature Ton and the OFF temperature Toff are configured to be extracted from the drive control map shown in FIG. 8, the temperature Ton and the OFF temperature Toff are calculated based on environmental information inside and outside the vehicle cabin and a target environmental state adjusted by the occupant. You may comprise. In this case, the calculation may be made such that the ON temperature Ton and the OFF temperature Toff of the compressor 7 decrease every time the fogging occurs.

In this embodiment, the window glass 4
Although the fogging generated on the inner surface of the window glass 4 is detected by the fogging sensor 26, the present invention is not limited to this. It is determined that fogging has occurred or it is determined that fogging may occur. Based on this determination, a fogging operation is performed, or the ON temperature Ton of the compressor 7 is determined.
And the OFF temperature Toff, and the changed O
Anti-fogging air conditioning control for controlling the drive of the compressor 7 based on the N temperature Ton and the OFF temperature Toff may be performed.

[0093]

According to the present invention (claim 1), the setting is changed such that the stop temperature of the refrigerant compressor with respect to the outlet temperature of the refrigerant evaporator is reduced every time the fogging occurs on the inner surface of the window glass. Since the driving of the refrigerant compressor is controlled based on the set stop temperature, the driving rate of the refrigerant compressor is increased and the air blown into the vehicle compartment is increased each time the inside surface of the window glass becomes cloudy. The humidity is gradually reduced, and the humidity in the vehicle interior is gradually reduced. The occurrence of fogging on the inner surface of the window glass 44 is gradually and reliably suppressed, and the fogging on the inner surface of the window glass is reduced. It is possible to make it difficult to generate, it is possible to reliably reduce the degree of occurrence of fogging,
Visibility is improved and safety is improved.

Further, since the stop temperature of the refrigerant compressor with respect to the outlet temperature of the refrigerant evaporator is gradually reduced each time fogging occurs, the refrigerant compression until the fogging is reliably suppressed. This minimizes the reduction of the stop temperature of the compressor and minimizes the increase in the drive rate of the refrigerant compressor, minimizing deterioration in fuel efficiency and impairment of heating performance due to driving of the refrigerant compressor. be able to.

Further, according to the present invention (claim 2), the setting is changed so that the starting temperature of the refrigerant compressor with respect to the outlet temperature of the refrigerant evaporator is also reduced each time fogging occurs on the inner surface of the window glass. Since the drive of the refrigerant compressor is controlled based on the changed starting temperature, the driving rate of the refrigerant compressor is further increased and blown into the vehicle compartment every time the fogging occurs on the inner surface of the window glass. The humidity of the air is gradually reduced, and the humidity in the passenger compartment is gradually reduced, so that the occurrence of fogging on the inner surface of the window glass 44 is more reliably suppressed, and fogging occurs on the inner surface of the window glass. It is possible to reduce the degree of fogging more reliably, improve visibility, and improve safety.

According to the present invention (claim 3), while the occurrence of fogging is determined by the fogging determining means, demist control for increasing the air distribution ratio to the defroster outlet is performed, and refrigerant compression is performed. By performing fog removal control that drives and controls at least one of the machine and the inside / outside air switching means so that the fogging is eliminated, the fogging generated on the inner surface of the window glass is quickly and reliably eliminated. Visibility is further improved and safety is improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a vehicle air-conditioning control device as one embodiment of the present invention.

FIG. 2 is a diagram showing switching means in the vehicle air conditioning control device as one embodiment of the present invention.

FIGS. 3A and 3B are views showing a fogging detection sensor in the vehicle air-conditioning control device as one embodiment of the present invention, wherein FIG. 3A is a top view and FIG.

FIG. 4 is a diagram showing an output waveform of a fogging sensor in the vehicle air conditioning control device as one embodiment of the present invention.

FIG. 5 is a perspective view of a fogging detection sensor in the vehicle air conditioning control device as one embodiment of the present invention.

FIG. 6 is a diagram showing a main flowchart for explaining the operation of the vehicle air-conditioning control device as one embodiment of the present invention.

FIG. 7 is a flowchart illustrating an operation of the vehicle air-conditioning control device as one embodiment of the present invention.

FIG. 8 is a diagram illustrating a relationship between an outside air temperature and an inside air introduction rate in the vehicle air-conditioning control device as one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Vehicle air-conditioning control device 4 Intake door (inside / outside air switching means) 5 Evaporator (refrigerant evaporator) 7 Compressor (refrigerant compressor) 20 Control unit (air-conditioning control means) 20A Temperature setting means 20B Compressor drive control means 20C Cloudy Judging means 20D Temperature setting changing means 25 Evaporator temperature sensor (outlet air temperature detecting means) 30 Switching means (adjusting means)

Claims (3)

[Claims] 1. A refrigerant compressor for compressing and discharging a sucked refrigerant and a low-temperature and low-pressure refrigerant disposed in an air-conditioning duct and supplied by the operation of the refrigerant compressor. A cooling cycle having a refrigerant evaporator for dehumidifying and cooling the air to be discharged, an outlet air temperature detecting means for detecting an outlet air temperature of the refrigerant evaporator, and the outlet air temperature based on at least environmental information inside and outside the vehicle cabin. Temperature setting means for setting a start temperature and a stop temperature of the refrigerant compressor, and the refrigerant compressor until the outlet air temperature from the outlet air temperature detection means becomes lower than the stop temperature when the outlet air temperature becomes higher than the start temperature. Compressor drive control means to be driven; fogging determining means for determining the occurrence of fogging on an inner surface of a window glass constituting the cabin; and Temperature setting change means for changing the stop temperature so that the stop temperature is lower than the stop temperature when the occurrence of fogging is determined, each time the occurrence of heat is determined, and the compressor drive control means includes: An air-conditioning control device for a vehicle, wherein after the occurrence of fogging, the refrigerant compressor is drive-controlled based on the stop temperature set and changed by the temperature setting change means. 2. The apparatus according to claim 1, wherein the temperature setting changing means sets the starting temperature to be lower than the starting temperature when the occurrence of the fogging is determined each time the occurrence of the fogging is determined by the fogging determining means. The compressor drive control means, after the occurrence of the fogging, controls the drive of the refrigerant compressor based on the starting temperature changed by the temperature setting change means. 2. The vehicle air-conditioning control device according to claim 1. 3. While the fogging is being determined by the fogging determining means, demist control for increasing the air distribution ratio to the defroster outlet is performed, and the state of introduction of the refrigerant compressor and the inside and outside air is switched. 2. The air conditioning control device for a vehicle according to claim 1, wherein fogging control is performed to control driving of at least one of the inside and outside air switching means so that the fogging is eliminated.