JPH0655927A - Vehicular air conditioner - Google Patents

Abstract

PURPOSE:To reduce power consumption of a cooling means, and prevent cloudiness of window glass. CONSTITUTION:When a room inside temperature is lower than a preset temperature and the difference is large (in the early stage of a heating operation start), and when a quantity of solar radiation is weak, a control circuit 20 judges that possibility of window glass 35 becoming cloudy is high, and increases refrigerant compression capacity in a refrigerant compressor 11 by fuzzy control. Even when the room inside temperature is lower than the preset temperature and the difference is large (in the early stage of the heating operation start), when the quantity of solar radiation is abundant, the control circuit 20 judges that the possibility of the window glass 35 becoming cloudy is low, and decreases the refrigerant compression capacity in the refrigerant compressor 11 by the fuzzy control. Thereby, since the refrigerant compression capacity of the refrigerant compressor 11 can be prevented from being increased uselessly, motive power consumption of the refrigerant compressor 11 can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner for automatically controlling the temperature of a vehicle compartment to a set temperature.

[0002]

2. Description of the Related Art As a conventional technique, a technique disclosed in JP-A-58-33516 is known. This technology determines and controls the cooling capacity of the cooling means from the vehicle state such as the vehicle exterior temperature, the amount of solar radiation, the vehicle interior temperature, and the set temperature. With this technique, the power consumption of the cooling means can be kept low. Specifically, if the cooling means is a refrigerant evaporator of a refrigeration cycle, the operating rate of the refrigerant compressor and the refrigerant discharge capacity are reduced, and the power applied to the refrigerant compressor is reduced.

[0003]

However, in the above-mentioned prior art, when the room temperature is lower than the set temperature, for example, the cooling means does not operate, or even if it operates, the cooling capacity is small. Therefore, when the room temperature is lower than the set temperature, the effect of dehumidifying the room by the cooling means cannot be expected. Therefore, even when the air conditioner is operated during rainy weather, rainy season, or high humidity such as inside air mode, the window glass is fogged.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an air conditioner for a vehicle, which can suppress the consumption power of the cooling means to a low level and prevent the window glass from fogging.

[0005]

The vehicle air conditioner of the first invention employs the following technical means (see FIG. 13).
An air conditioner for a vehicle includes a duct for sending air toward a vehicle compartment, a blower for generating an air flow toward the vehicle interior in the duct, and a duct disposed in the duct to cool air blown into the vehicle interior. Cooling means, a heating means arranged in the duct downstream of the cooling means for heating the air blown into the passenger compartment, an air cooling capacity by the cooling means, and an air heating capacity by the heating means. And a control circuit for controlling the temperature of the vehicle interior to a set temperature. The control circuit includes a cooling capacity determination unit that detects a vehicle state such as a vehicle exterior temperature and a vehicle interior temperature, and determines a cooling capacity of the cooling unit necessary to maintain the vehicle interior temperature at a set temperature. At the same time, an auxiliary cooling unit is provided that increases the cooling capacity of the air by the cooling unit at least at the beginning of the heating operation and when the solar radiation is weak. It should be noted that the heating operation is intended to raise the temperature inside the vehicle compartment as a result, regardless of whether the cooling means is operated or not.

The vehicle air conditioner of the second invention employs the following technical means (see FIG. 14). The vehicle air conditioner is provided so as to be able to introduce vehicle interior air (hereinafter referred to as internal air), a duct for sending air toward the vehicle interior, and a blower that causes an air flow toward the vehicle interior in the duct, A cooling unit arranged in the duct for cooling the air blown into the vehicle interior, a heating unit arranged in the duct downstream of the cooling unit for heating the air blown into the vehicle interior, and the cooling unit. And a control circuit for controlling the cooling capacity of the air and the heating capacity of the air by the heating means so as to control the temperature in the vehicle compartment to a set temperature. The control circuit includes a cooling capacity determining unit that detects a vehicle state such as an outside air temperature and an inside air temperature, and determines a cooling capacity of the cooling unit necessary to maintain the inside air temperature at a set temperature. An auxiliary cooling unit that increases the cooling capacity of the air by the cooling unit is provided in the state where the duct introduces the inside air, at the beginning of the operation of the heating operation, and when the vehicle exterior temperature is low.

[0007]

[Operation of the invention]

[Operation of the first invention] (When the solar radiation is weak) The control circuit is
Moreover, when the solar radiation is weak, the window glass is likely to become cloudy. Therefore, the auxiliary cooling means increases the cooling capacity of the cooling means for a while after the start of the heating operation. When the cooling capacity of the cooling means increases, the dehumidifying capacity of the air blown into the vehicle interior increases, and the humidity inside the vehicle interior decreases. Therefore, even if the surface temperature inside the window glass is low at the beginning of the operation of the heating operation, the humidity in the room is lowered by the dehumidification by the cooling means, so that the window glass is prevented from being fogged. After some time has passed since the heating operation was started, the surface temperature inside the window glass approaches the temperature inside the vehicle compartment. In other words, since the inner surface of the window glass becomes high, it becomes difficult to fog. For this reason, after a lapse of some time from the start of the heating operation, the control circuit determines the cooling capacity of the air by the cooling means by the cooling capacity determination means and suppresses the consumption power applied to the cooling means to a low level. Even when the sunlight is strong, the control circuit (when the sunlight is strong) increases the temperature of the window glass due to the sunlight even when the sunlight is strong, and the humidity outside the cabin is low, so the window glass is less likely to become cloudy. The cooling capacity of the cooling means is not increased by the auxiliary cooling means, but the cooling capacity of the cooling means is determined by the cooling capacity determining means, and the power consumption of the cooling means is kept low. Therefore, it is possible to suppress unnecessary power consumption of the cooling means.

[Operation of Second Invention] (When the duct introduces the inside air) The inside air has a relatively high humidity due to the occupant's breath and sweating. The control circuit is likely to fog the window glass at the beginning of the heating operation, and therefore, for a while after the operation of the heating operation is started by the auxiliary cooling means.
Increase the cooling capacity of the cooling means. Also, when the outside air temperature is low, the surface temperature of the window glass does not rise much even after a while after starting the heating operation,
Since the window glass is likely to become cloudy, the cooling capacity of the cooling means is increased. When the cooling capacity of the cooling means becomes large, even if the humidity introduced by the duct in the inside air mode is high, the humidity of the air blown into the room due to the dehumidification by the cooling means is reduced, so that the window glass is prevented from being fogged. When some time has passed since the heating operation was started, and the outside air temperature at this time is relatively high, the inner surface of the window glass becomes high due to the heating operation, so that it does not fog up regardless of the humidity in the vehicle interior. Then, the control circuit determines the cooling capacity of the air by the cooling means by the cooling capacity determination means and suppresses the consumption power applied to the cooling means to a low level. (When the duct introduces the outside air) The outside air has a lower humidity than the inside air. The control circuit, when the duct introduces outside air,
Since the possibility of fogging of the window glass is low, the cooling capacity of the cooling means is not increased by the auxiliary cooling means, and the cooling capacity of the air by the cooling means is determined by the cooling capacity determination means, and the power consumption of the cooling means is kept low. . Therefore, it is possible to suppress unnecessary power consumption of the cooling means.

[0009]

【The invention's effect】

[Effects of the first invention] The vehicle air conditioner of the first invention is
As shown in the above action, without adding a special sensor (humidity sensor, etc.), the cooling capacity of the cooling means is increased when there is a high possibility that the window glass will become cloudy (in the initial heating when the sunlight is weak). Therefore, it is possible to suppress the fogging of the window glass and suppress the consumption power applied to the cooling means to a low level.

[Effect of Second Invention] In the vehicle air conditioner of the second invention, as described above, there is a possibility that the window glass becomes cloudy without adding a special sensor (humidity sensor or the like). When the temperature is high (when the outside air temperature is low and at the beginning of heating), the cooling capacity of the cooling means is increased, so that it is possible to suppress fogging of the window glass and to suppress the consumption power of the cooling means to be low.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a vehicle air conditioner of the first invention will be described.
An air conditioner for a vehicle according to a second aspect of the present invention will be described based on a second embodiment. [Configuration of First Embodiment] FIGS. 1 to 6 show a first embodiment, and FIG. 1 is a schematic configuration diagram of a vehicle air conditioner to which the first invention is applied. The vehicle air conditioner 1 includes a duct 2 for sending air toward the passenger compartment. Upstream of the duct 2, an inside air inlet 3 for introducing the inside air and an outside air inlet 4 for introducing the outside air into the vehicle compartment.
And are formed. Then, the opening degrees of the inside air introduction port 3 and the outside air introduction port 4 are adjusted by the inside / outside air switching damper 5. The inside / outside air switching damper 5 is, for example, the servo motor 4
Driven by 0, an outside air mode in which only outside air is introduced into the duct 2, an inside / outside air mode in which both outside air and inside air are introduced into the duct 2, and an inside air mode in which only inside air is introduced into the duct 2 are selected. The servomotor 40 is provided with a potentiometer 41 for detecting the setting state of the inside / outside air switching damper 5.

Inside the duct 2, a blower 6, a cooling means 7 and a heating means 8 are sequentially arranged from the upstream side to the downstream side, and the air passing through the duct 2 blows out toward the upper half of the occupant's upper body. The air is blown from the face air outlet 9a or the foot air outlet 9b which blows air to the feet of the occupant.
The face outlet 9a and the foot outlet 9b are switched by the outlet switching damper 42. The blower outlet switching damper 42 is driven by, for example, a servo motor 43, and a face mode in which air is blown out only from the face blower outlet 9a, a face blower outlet 9a and a foot blower outlet 9a.
The bi-level mode in which air is blown out from both b and the foot mode in which air is blown out only from the foot outlet 9b are selected.

The blower 6 generates an air flow in the duct 2 and blows the air sucked from the inside air inlet 3 or the outside air inlet 4 into the passenger compartment. The cooling means 7 is a refrigerant evaporator of the refrigeration cycle 10 in this embodiment. The refrigeration cycle 10 includes the refrigerant compressor 1 as well as the refrigerant evaporator.
1, a refrigerant condenser 12, and a pressure reducing device 13, and a refrigerant pipe 1
It is a well-known thing connected by 4. As the refrigerant compressor 11 of the present embodiment, a variable capacity type that changes the compression capacity of the refrigerant is used. That is, the cooling capacity of the air by the cooling means 7 is changed by changing the refrigerant compression capacity of the refrigerant compressor 11. Note that, as an example of the variable capacity refrigerant compressor 11, for example, one that changes an inclination angle of a swash plate is known. The heating means 8 is a heater core 15 which uses engine cooling water (warm water) as a heat source.
A bypass passage 16 that bypasses the heater core 15;
An air mix damper 17 for adjusting the ratio of the air passing through the heater core 15 and the air passing through the bypass passage 16.
Consists of. Then, by changing the opening degree of the air mix damper 17, the amount of air passing through the heater core 15 changes, and as a result, the heating capacity of air changes. In addition,
The air mix damper 17 is driven by, for example, a servo motor 18. The circulation of the cooling water to the heater core 15 is controlled by the water valve 19. A computer is used for the setting state of the inside / outside air switching damper 5, the blowing capacity of the blower 6, the refrigerant compression capacity of the refrigerant compressor 11, the opening degree of the air mix damper 17, the setting state of the outlet switching damper 42, etc. described above. It is controlled by the control circuit 20.

(Description of Control Circuit 20) The control circuit 20 is
Inside air sensor 2 for detecting the temperature inside the vehicle (inside air temperature Tr)
1, an outside air sensor 22 that detects the temperature outside the vehicle interior (outside air temperature Tam), a water temperature sensor 23 that detects the temperature of the engine cooling water (water temperature Tw), a solar radiation sensor 24 that detects the amount of solar radiation Ts entering the vehicle interior, An outlet temperature sensor 25 that detects the temperature of the air that has passed through the cooling means 7 (post-evaporation temperature Te), a servo motor 18 that drives the air mix damper 17, and a potentiometer that detects the opening degree of the air mix damper 17. Signals from a meter 26, a temperature setter 44 for setting a target temperature in the vehicle compartment by a user, and the like are read through an A / D converter 27, and air conditioning control is performed based on these various signals. Then, the control circuit 20 that performs this air conditioning control stores a CPU 28 that receives a signal from the A / D converter 27 and calculates the operation amount of each unit, a plurality of fuzzy rules and membership functions used in fuzzy inference to be described later. ROM 29, output unit 30 for outputting control signals calculated by CPU 28 to each unit, several MHz
The crystal oscillator 31 is configured to oscillate the reference signal of to perform arithmetic processing. Note that the control circuit 20 is supplied with electric power from the battery 33 when the ignition switch 32 is ON, and is in an operable state.
Is operated to start the air conditioning control.

Next, the variable capacity of the refrigerant compressor 11 is determined,
That is, the control of the cooling capacity determining means for determining the cooling capacity of the cooling means 7 required to maintain the vehicle interior temperature at the set temperature is shown in the flowchart of FIG. When the operation of the vehicle air conditioner 1 is started by the operation switch 34, initial values of counters and flags used for executing the subsequent processing are set in step S1. In step S2, the set temperature Tset set in the temperature setter 44 is read. In step S3, the environmental conditions of the vehicle such as the inside air temperature Tr, the outside air temperature Tam, and the amount of solar radiation Ts are read by various sensors. In step S4, the temperature deviation Tdi is obtained by using the set temperature Tset and the inside air temperature Tr and the following mathematical expression 1, and the cooling means 7 is determined by fuzzy inference based on the temperature deviation Tdi, the outside air temperature Tam, and the solar radiation amount Ts. The target cooling temperature TEO of the passing air is calculated. That is, the refrigerant compression capacity of the refrigerant compressor 11, which is the cooling capacity of the cooling means 7, is set.

## EQU1 ## Tdi = αTr-βTset + γ where α and β are correction coefficients that satisfy the relationship α ≦ β, and γ is the temperature deviation Tdi when Tr = Tset = reference temperature (for example, 25 ° C.). It is a correction value for setting to 0. Then, in step S5, the post-evaporation temperature T detected by the outlet temperature sensor 25 is detected.
Refrigerant compressor 1 so that e becomes the target cooling temperature TEO.
The capacity control of 1 is performed, and then the process returns to step S2.

The control of the heating amount of the blown air by the heating means 8 and the control of the air amount are performed separately from the above control, and an example of the control is shown in the flow chart of FIG. First, in step S6, the set temperature Tset is set from various sensors.
, Inside air temperature Tr, outside air temperature Tam, solar radiation amount Ts, post-evaporation temperature Te of the cooling means 7, cooling water temperature Tw, etc. are read. Then, in step S7, the target outlet temperature TAO is calculated from the read signal by using the following equation (2).

## EQU2 ## TAO = Kset.Tset-Kr.Tr-Kam.Tam-Ks.Ts + C where Kset, Kr, Kam, and Ks are coefficients, and C is a correction value. Subsequently, in step S8, inside / outside air switching control, outlet mode control, air volume control, and other controls are performed from the calculated target outlet temperature TAO. Next, step S
At 9, the heating capacity of the air by the heating means 8 is controlled. Specifically, the opening degree SW of the air mix damper 17 is determined by using the following expression 3 and the amount of air heated by the heating means 8 is controlled.

## EQU00003 ## SW = {(TAO-Te) / (Tw-Te)} * 100 Then, after execution of step S9, the process returns.

(Explanation of Fuzzy Reasoning) Next, a fuzzy reasoning procedure for calculating a target cooling temperature TEO for variable capacity control of the refrigerant compressor 11 and a fuzzy reasoning stored in the ROM 29 are executed. Describe membership functions and fuzzy rules. First, FIGS. 4A to 4D show membership functions used in fuzzy reasoning. The horizontal axis of FIG. 4 corresponds to each input / output value, and the vertical axis corresponds to the “degree of certainty” (hereinafter, CF value) according to the input / output value. FIG. 4A is a characteristic diagram showing a membership function regarding the outside air temperature Tam. The fuzzy set of the outside air temperature Tam according to the present embodiment is set according to the set outside air temperatures Tam1 to Tam4 in the winter (W
I), spring and autumn (AU), spring and summer (AS), and summer (SU). Then, the CF value regarding the outside air temperature Tam is set by each membership function. FIG. 4B is a characteristic diagram showing a membership function regarding the amount of solar radiation Ts. The fuzzy set of the amount of solar radiation Ts of this embodiment is divided into two stages of weak (WK) and strong (SG) according to the set amount of solar radiation Ts1 and Ts2.
And the amount of solar radiation T is calculated by each membership function.
The CF value for s is set. FIG. 4C is a characteristic diagram showing a membership function regarding the temperature deviation Tdi. The fuzzy set of the temperature deviation Tdi in the present embodiment is negatively large (NB), negatively small (NS), substantially zero (ZO), and positively small (P) according to the set temperature deviations E1 to E5.
S) and positive and large (PB).
Then, the CF value regarding the temperature deviation Tdi is set by each membership function. FIG. 4D is a characteristic diagram showing a membership function regarding the target cooling temperature TEO. The fuzzy set of the target cooling temperature TEO of this embodiment is the target cooling temperature of 3 ° C., 5 ° C., 7 ° C., 10 ° C., 15
About 3 ℃ (B3), about 5 ℃ (B5), about 7 ℃
(B7), about 10 ° C (B10), about 15 ° C (B15). Then, the CF value regarding the target cooling temperature TEO is set by each membership function.

The target cooling temperature TEO is set based on the outside air temperature Tam, the amount of solar radiation Ts and the temperature deviation Tdi, and the fuzzy rule tables 1 to 4 shown below.

[Table 1]

[Table 2]

[Table 3]

[Table 4] Note that (a1) to (a40) shown in Tables 1 to 4 represent fuzzy rule numbers. Here, for example, Table 1
When the fuzzy rules (a1) to (a10) of (3) are described in general, they are as follows. Note that the fuzzy rules (a11) to (a40) in Tables 2 to 4 can be described in the same manner. (a1) IF (Tam = WI & Tdi = NB & Ts = WK) THEN (TEO = B3) (a2) IF (Tam = WI & Tdi = NS & Ts = WK) THEN (TEO = B10) (a3) IF (Tam = WI & Tdi = ZO & Ts = WK ) THEN (TEO = B15) (a4) IF (Tam = WI & Tdi = PS & Ts = WK) THEN (TEO = B15) (a5) IF (Tam = WI & Tdi = PB & Ts = WK) THEN (TEO = B15) (a6) IF ( Tam = WI & Tdi = NB & Ts = SG) THEN (TEO = B10) (a7) IF (Tam = WI & Tdi = NS & Ts = SG) THEN (TEO = B10) (a8) IF (Tam = WI & Tdi = ZO & Ts = SG) THEN (TEO = B10) (a9) IF (Tam = WI & Tdi = PS & Ts = SG) THEN (TEO = B10) (a10) IF (Tam = WI & Tdi = PB & Ts = SG) THEN (TEO = B10)

In this embodiment, except for summer, in winter, spring-autumn, and spring-summer, when solar radiation is weak at the beginning of heating operation,
That is, the temperature deviation is negative and large (NB), and solar radiation is weak (W
In the case of K), there is a possibility that the window glass 35 is likely to be fogged, such as when it is raining.
The target cooling temperature TEO is set to a small value of B3 in order to increase the cooling capacity of the air by (the function of the auxiliary cooling means). Then, when the heating progresses and the temperature deviation Tdi becomes small (NS), the temperature of the window glass 35 also rises and the possibility of clouding becomes small, so the target cooling temperature TEO.
To B7 or B10, and the cooling means 7 for cooling the air by the cooling means 7 is made smaller. Even in summer, when the solar radiation is weak at the beginning of the heating operation, that is, when the temperature deviation is negative and large (NB) and the solar radiation is weak (WK), the window glass 35
In order to increase the cooling capacity of the air by the cooling means 7, the target cooling temperature TEO is set to
It is a relatively small value of 5. Further, even in the initial stage of the heating operation, when the solar radiation is strong, that is, when the temperature deviation is negative and large (NB) and the solar radiation is strong (SG), the temperature of the window glass 35 is increased by the solar radiation, and the outside air Since the humidity is also low, the target cooling temperature TEO is set to B1 in order to reduce the air cooling capacity of the cooling means 7.
It is set to a large value of 0. Note that Table 4 is a fuzzy rule for summer, and the target cooling temperature TEO is generally set to the minimum value B3. And, Tables 2 and 3 of Spring Autumn and Spring Summer
Is between winter and summer Tables 1 and 4, and is therefore set to an intermediate tendency between Tables 1 and 4.

Next, the procedure of fuzzy reasoning executed in step S4 is shown in the flowchart of FIG. First, in step S10, the temperature deviation Tdi, the outside air temperature Tam, the solar radiation amount T
A fuzzy rule to which these three input variables belong is selected from s. In step S11, CF values corresponding to the three input variables are calculated for each selected fuzzy rule. Next, in step S12, the CF value of the temperature deviation Tdi and the outside air temperature T for each selected fuzzy rule.
The CF value of am and the CF value of the solar radiation amount Ts are multiplied to calculate the composite value of the CF values. Then, in step S13, for each selected fuzzy rule, according to the latter half of the fuzzy rule (THEN or less), the corresponding target cooling temperature TEO is reached.
A weighting process is performed on the membership function regarding the combined value (specifically, the corresponding target cooling temperature T
Add the combined value to EO). In step S14, all weighted target cooling temperature TEO membership functions are superposed (see one example in FIG. 6) for each selected fuzzy rule, and a new union membership function relating to the target cooling temperature TEO is obtained. create. Then, in step S15, the centroid value of the new membership function is calculated, and the centroid value is determined as the target cooling temperature TEO.

[Operation of First Embodiment] Next, the operation of the first embodiment will be briefly described. When the operation switch 34 is operated and the inside air temperature Tr is lower than the set temperature Tset, the heating operation is started. Then, the inside air temperature Tr and the set temperature T
When the difference from the set is large, that is, when the temperature deviation Tdi is large, when the solar radiation is weak at the beginning of the heating operation,
By the auxiliary cooling means of the control circuit 20, the target cooling temperature T
EO is set small. That is, the compression capacity of the refrigerant compressor 11 increases and the cooling capacity of the cooling means 7 increases. When the compression capacity of the refrigerant compressor 11 increases and the target cooling temperature TEO decreases, the dehumidification capacity of the air passing through the cooling means 7 increases, and the temperature of the warm air heated by the heating means 8 and blown out into the room. Is reduced. Therefore, at the beginning of the operation of the heating operation, even if the inside air temperature Tr rises due to the heating of the air conditioner 1 and the surface temperature of the window glass 35 on the passenger compartment side is low, the dehumidifying effect of the cooling means 7 causes the window glass to operate. The fogging of 35 can be prevented. When the heating operation is started for a while, the inside air temperature Tr rises due to the heating operation, the temperature deviation Tdi decreases, and the temperature of the window glass 35 rises. When the temperature deviation Tdi decreases, the compression capacity of the refrigerant compressor 11 decreases, but the temperature of the window glass 35 rises so that the window does not become cloudy. That is, it is possible to suppress the wasteful power applied to the refrigerant compressor 11. On the other hand, the inside air temperature Tr and the set temperature T
Even if the difference from the set is large, when the solar radiation is strong, it is less likely that the window glass 35 becomes cloudy due to the temperature rise and the humidity decrease of the window glass 35 due to the solar radiation.
Is set relatively large. As a result, even in the initial stage of heating, the compression capacity of the refrigerant compressor 11 becomes small, and the wasteful power applied to the refrigerant compressor 11 can be suppressed.

[Effect of the First Embodiment] In the present embodiment, as described above, dehumidification is performed only when the solar radiation is weak and the window glass 35 is likely to become cloudy at the beginning of the heating operation. When the sunshine is strong and the possibility that the window glass 35 will be fogged is low, the compression capacity of the refrigerant compressor 11 can be reduced to suppress the power consumption of the refrigerant compressor 11 to a low level. it can.

[Structure of Second Embodiment] FIGS. 7 to 12 show a second embodiment. The hardware of the air conditioner in this embodiment is common to that of the first embodiment (however, the fixed capacity type refrigerant compressor is adopted), and FIG. 1 of the first embodiment is shared. The control circuit 20 is an air conditioner such as the setting state of the inside / outside air switching damper 5, the blowing capacity of the blower 6, the refrigerant compression capacity of the refrigerant compressor 11, the opening degree of the air mix damper 17, the setting state of the outlet switching damper 42, and the like. The electrical control of the electrical component No. 1 is performed, and its operation is shown in the flowchart of FIG. When the operation of the vehicle air conditioner 1 is started by the operation switch 34, initial values of counters and flags used for execution of subsequent processing are set in step S21. In step S22, the set temperature Tset set in the temperature setter 44 is read. In step S23, various sensors read the environmental conditions of the vehicle such as the inside temperature Tr, the outside temperature Tam, and the amount of solar radiation Ts. In step S24, the target outlet temperature TAO is calculated based on the set temperature Tset, the inside air temperature Tr, the outside air temperature Tam, and the amount of solar radiation Ts (first).
(See Equation 2 in the example). In a succeeding step S25, the target opening degree SW of the air mix damper 17 is calculated based on the target outlet temperature TAO, the cooling water temperature Tw, and the after-evaporation temperature Te (see Formula 3 of the first embodiment). In the next step S26,
According to FIG. 8, the applied voltage of the blower 6 is calculated from the target outlet temperature TAO. In step S27, the outlet mode is determined from the target outlet temperature TAO according to FIG. Step S
In 28, the introduction mode of the inside and outside air is determined from the target outlet temperature TAO according to FIG. In step S29, the ON / OFF operation of the refrigerant compressor 11 (electromagnetic clutch not shown) is determined according to the flow described later. Next, in step S30,
According to the calculation results of steps S25 to S29, the blower 6,
Refrigerant compressor 11 (electromagnetic clutch), servo motor 18,
The control signal is output to 40 and 43, and the inside / outside air switching damper 5,
Blower 6, refrigerant compressor 11, air mix damper 17,
And, the operation control of the outlet switching damper 42 is performed. afterwards,
In step S31, it is determined whether or not the control cycle τ has elapsed. If the determination result is NO, step S31 is repeated, and if YES, the process returns to step S22.

Next, the operation control of the refrigerant compressor 11 (functions of the cooling capacity determining means and the auxiliary cooling means for controlling the cooling degree of the cooling means 7) will be described with reference to the flowchart shown in FIG. First, in step S32, it is determined whether the introduction mode of the inside / outside air is the introduction mode of only the outside air or the combined mode of introducing only the inside air or both the inside air and the outside air. It is judged from the voltage value of the potentiometer 41 of the servomotor 40 that drives the motor 5 (see FIG. 12). When it is determined from the determination result that the introduction mode of the inside / outside air is the introduction mode of only the outside air, in step S33, the operation control of the refrigerant compressor 11 is performed based on the function of the cooling capacity determination means. The function of the cooling capacity determining means in this embodiment will be described. In step S33, it is first determined whether the outside air temperature Tam is lower than the target outlet temperature TAO by 5 ° or more. Then, when the outside air temperature Tam is lower than the target outlet temperature TAO by 5 ° or more, the operation of the refrigerant compressor 11 is always stopped (the electromagnetic clutch is always turned off). Further, the outside air temperature Tam is the target outlet temperature TAO-5 °.
If it is higher, the operation stop temperature A of the refrigerant compressor 11 set for the target outlet temperature TAO is set according to the graph in step S33. That is, the operation stop temperature D of the refrigerant compressor 11 set at the post-evaporation temperature Te is set at the operation stop temperature A set for the target outlet temperature TAO. When it is determined that the determination result in step S32 is the introduction mode of only the inside air or the combined mode of the inside air and the outside air, the operation control of the refrigerant compressor 11 is performed based on the function of the auxiliary cooling means in step S34. The function of the auxiliary cooling means in this embodiment will be described. This step S34
First, the operation stop temperature A of the refrigerant compressor 11 set for the target outlet temperature TAO is set according to the upper graph in step S34. Next, according to the middle graph in step S34, the operation stop temperature B of the refrigerant compressor 11 set with respect to the outside air temperature Tam is set (this setting is
This is a means for increasing the cooling capacity when the outside air temperature Tam is low). Then, according to the lower graph in step S34, the operation stop temperature C of the refrigerant compressor 11 set for the inside air temperature Tr is set (this setting is a means for increasing the cooling capacity at the beginning of heating). is there). The operation stop temperature D of the refrigerant compressor 11 set at the post-evaporation temperature Te is set to the operation stop temperature A set at the target outlet temperature TAO, the operation stop temperature B set at the outside air temperature Tam, and the inside air temperature. It is set to the minimum temperature among the operation stop temperatures C set in Tr. Subsequently, in step S35, the detected post-evaporation temperature Te and the operation stop temperature B are compared to determine the operation state of the refrigerant compressor 11 (ON-OFF of the electromagnetic clutch).

[Operation of Second Embodiment] Next, the operation of the second embodiment will be briefly described. (Inside air mode, combined use mode of inside air and outside air) When the inside / outside air mode is the inside air mode or the combination mode of inside air and outside air with the air conditioner 1 started to operate, the air with relatively high humidity inside the vehicle is Inhale into duct 2. Therefore, the window glass 35 is likely to become cloudy at the beginning of heating or when the outside air temperature is low. However, the operating temperature of the refrigerant compressor 11 is set low by the auxiliary cooling means of the control circuit 20 at the beginning of heating (when the temperature inside the vehicle is low) or when the outside air temperature is low. The cooling capacity of the cooling means 7 becomes large, and the dehumidification capacity of the air passing through the cooling means 7 becomes large. Therefore, it is possible to prevent fogging of the window glass 35 even at the beginning of the operation of the heating operation or when the outside air temperature is low. When the operation of the heating operation is started for a while and the outside air temperature is high, the control for increasing the cooling capacity of the cooling means 7 by the auxiliary cooling means is stopped. This is because when the operation of the heating operation is started for a while and the outside air temperature is high, the temperature of the window glass 35 rises and the temperature deviation from the indoor temperature decreases, and the window glass 3
This is because 5 does not become cloudy.
It is possible to suppress unnecessary power consumption. (Outside Air Mode) When the air conditioner 1 has started to operate and is in the outside air mode, the cooling capacity determining means of the control circuit 20 suppresses and controls the operation of the refrigerant compressor 11. In the outside air mode, even if the outside air temperature is low, since the absolute humidity of the air introduced into the duct 2 is low, an increase in humidity inside the vehicle compartment is suppressed, and as a result, the window glass 35 is less likely to be fogged. Therefore, the operation of the refrigerant compressor 11 is suppressed and controlled in the outside air mode, so that wasteful power applied to the refrigerant compressor 11 can be suppressed.

[Effects of Second Embodiment] In the present embodiment, as described above, when the inside / outside air mode is the inside air mode or the combined mode of the inside air and the outside air, the start of heating operation and the outside air temperature are performed. Is low, that is, only when the window glass 35 is likely to be fogged, the dehumidifying ability is increased to suppress the fogging of the window glass 35. Then, when the possibility that the window glass 35 is clouded is low, that is, in the outside air introduction mode or even in the mode of introducing the inside air, after a while after the start of heating or when the outside air temperature is relatively high, the refrigerant Since the operation of the compressor 11 is suppressed, the power consumption of the refrigerant compressor 11 can be suppressed low. Further, since the refrigerant compressor 11 is not deactivated once it is dehumidified by the operation of the refrigerant compressor 11 in the inside air mode, dew attached to the refrigerant evaporator, which is the cooling means 7, is not re-evaporated, and the window glass 35 It can also prevent fogging.

[Modification] In the first embodiment, an example in which a triangular or trapezoidal shape is used for the membership function has been shown, but any shape suitable for the control specification may be used, and there is a contradiction in fuzzy arithmetic such as a bell shape. Any form is acceptable as long as it does not occur. In the first embodiment, fuzzy inference is performed by algebraic product-addition-
Although the centroid method is adopted, a general minimum value-maximum value-centroid method may be used. In the first embodiment, the air conditioning control is performed by fuzzy inference, but the air conditioning control may be performed by proportional control or map control. Although the cooling capacity is controlled by changing the compression capacity of the refrigerant compressor in the first embodiment, the cooling capacity may be controlled by controlling the energization time of the electromagnetic clutch.
The first invention and the second invention may be used together to further suppress the power consumption of the cooling means. Although the initial time of heating is determined using the inside air temperature, the initial time of heating may be determined using a timer. Although a refrigerant evaporator was used as the cooling means,
Other cooling means such as a cooling means for a refrigeration cycle by compression and expansion of air or a cooling means using a Peltier element may be used. Although the heater core that radiates the cooling water is used as the heating means, other heating means such as a PTC heater, a combustion heater, or a refrigerant condenser of a refrigeration cycle may be used. Although the example of switching the inside / outside air in stages (inside air, combined use of inside / outside air, and outside air) has been described, the introduction amount of inside / outside air may be continuously switched. At this time, as shown in FIG. 12, control may be performed by regarding the potentio voltage as a certain value or less as the inside air, the intermediate voltage value as the combined use of the inside and outside air, and the certain value or more as the outside air.

[Brief description of drawings]

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

FIG. 2 is an operation flowchart of a cooling capacity determination means (first embodiment).

FIG. 3 is an operation flowchart for controlling the opening degree of an air mix damper (first embodiment).

FIG. 4 is a graph showing a membership function (first)
Example).

FIG. 5 is a flowchart showing a procedure of fuzzy inference (first embodiment).

FIG. 6 is a graph in which membership functions are superimposed (first example).

FIG. 7 is a flowchart showing the operation of the air conditioner by the control device (second embodiment).

FIG. 8 is a graph showing the relationship between the target outlet temperature TAO and the voltage applied to the blower (second embodiment).

FIG. 9 is a graph showing a relationship between a target outlet temperature TAO and an outlet mode (second embodiment).

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

FIG. 11 is a flowchart for determining the operating state of the refrigerant compressor (second embodiment).

FIG. 12 is a graph showing the relationship between the inside / outside air introduction mode and the reading value of the potentiometer (second embodiment).

FIG. 13 is a schematic configuration diagram of a first invention.

FIG. 14 is a schematic configuration diagram of a second invention.

[Explanation of symbols]

 1 Vehicle Air Conditioner 2 Duct 6 Blower 7 Cooling Means 8 Heating Means 20 Control Circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Ito 1-1, Showa-cho, Kariya city, Aichi Nihon Denso Co., Ltd. (72) Inventor Katsuhiko Samukawa 1-1-1-1, Showa-cho, Kariya city, Aichi prefecture Incorporated (72) Inventor Sugimitsu 1-1, Showa-cho, Kariya city, Aichi Prefecture

Claims (2)

[Claims] 1. A duct for sending air toward a vehicle interior, a blower for generating an air flow toward the vehicle interior in the duct, and a cooling arranged in the duct for cooling air blown into the vehicle interior. Means and heating means arranged in the duct downstream of the cooling means for heating the air blown into the passenger compartment, and controlling the cooling capacity of the air by the cooling means and the heating capacity of the air by the heating means. In a vehicle air conditioner including a control circuit for controlling the temperature inside the vehicle to be a set temperature, the control circuit detects a vehicle state such as a vehicle outside temperature and a vehicle inside temperature, In addition to the cooling capacity determining means for determining the cooling capacity of the cooling means required to maintain the set temperature, at least at the beginning of the operation of the heating operation and when the solar radiation is weak. An air conditioner for a vehicle, further comprising auxiliary cooling means for increasing the cooling capacity of the air by the cooling means. 2. A duct for introducing air into a passenger compartment for sending air into the passenger compartment, a blower for generating an air flow toward the passenger compartment in the duct, and a duct arranged in the duct, Cooling means for cooling the air blown into the interior of the vehicle; heating means arranged in the duct downstream of the cooling means for heating the air blown into the passenger compartment; cooling capacity of the air by the cooling means; In a vehicle air conditioner comprising a control circuit for controlling the heating capacity of air by the heating means and controlling the temperature of the vehicle interior to be a set temperature, the control circuit is a vehicle exterior temperature, a vehicle interior temperature or the like. The vehicle is provided with a cooling capacity determining means for determining a cooling capacity of the cooling means necessary for maintaining the vehicle interior temperature at a set temperature by detecting the vehicle state. An air conditioner for a vehicle, comprising: an auxiliary cooling means for increasing the cooling capacity of the cooling means by the cooling means when the heating operation is started and when the temperature outside the vehicle is low in the introduced state.