JPH11151930A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner for vehicles, which can surely switch an inside introducing mode/outside air introducing mode while noise change is small. SOLUTION: When the blast quantity of air conditioned wind becomes smaller than specified blast quantity during the cooling of the air in a car component, since the current mode, a mode to introduced only inside air in an air conditioner case is switched to a half inside air mode to introduce outside air in the air conditioner case, while the air in the car component is being cooled, even if blast quantity is changed by outside air temperature, the ratio of blast quantity and the opening degree of an inside and outside air switching door becomes 1:1. Therefore, switching value BLW1 at the point where the current mode, an inside air introducing mode, is switched to a half air inside mode can be set beforehand to a point where noise change is small.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle, and more particularly, to control for switching between inside and outside air modes.

[0002]

2. Description of the Related Art Conventionally, in an air conditioner for a vehicle, switching between an inside air mode and an outside air mode of air sucked into an air conditioning case is performed according to a target outlet temperature TAO. For example, when the target outlet temperature TAO becomes lower than the predetermined switching value, the inside air mode is adopted in which the inside air (vehicle interior air) is sucked into the air conditioning case in order to improve the cooling capacity. (Outside air mode) in which (air outside the vehicle compartment) is sucked into the air conditioning case.

The target air temperature TAO is the target temperature of the conditioned air blown into the vehicle interior,
It is calculated by a predetermined arithmetic expression using the outside air temperature, the amount of solar radiation entering the vehicle interior, the set temperature in the vehicle interior, and the like as input information, and corresponds to the air conditioning heat load in the vehicle interior. The target outlet temperature TAO has a low value when the vehicle interior is cooled in summer, and has a high value when the vehicle interior is heated as in winter.

[0004] The target outlet temperature TAO is a parameter that also determines the amount of the conditioned air to be blown in addition to the switching between the inside and outside air modes. More specifically, as shown by the solid line in FIG. 4, the airflow increases in a region where the target blowout temperature TAO is high (right side in the figure) and in a region where the target blowout temperature TAO is low (left side in the diagram), and in the middle region of the target blowout temperature TAO. The air volume is the smallest.

Therefore, the switching between the inside and outside air modes and the amount of air-conditioned air are both determined by the target outlet temperature TAO, and thus have a one-to-one relationship. By the way, conventionally, in the vehicle air conditioner, the predetermined switching value of the inside / outside air mode is set based on the following concept. That is, if the predetermined switching value is set in a region where the airflow of the conditioned air is extremely large, such as a high temperature region or a low temperature region of the target outlet temperature TAO, the airflow is large when switching between the inside and outside air modes. The amount of change in ventilation noise caused by the difference in ventilation resistance between the inside and outside air modes is large. As a result, an uncomfortable feeling is given to the occupant in the vehicle interior, which is not preferable. Therefore, the predetermined switching value is set for each vehicle type so that the change in the blowing noise due to the conditioned air is small and a sufficient cooling capacity can be obtained.

[0006]

By the way, in the above conventional apparatus, the amount of air-conditioned air is determined only by the target air outlet temperature TAO, but the operating environment conditions vary widely like a vehicle. Then, if the air volume is simply determined by TAO alone, the air conditioning feeling (temperature feeling) required by the occupants
Cannot always be obtained.

Therefore, the inventor of the present invention has proposed a non-linear control method for correcting the air flow rate of conditioned air according to the outside air temperature (Tam), which greatly affects the occupant's feeling of air conditioning, as indicated by the one-dot chain line and the broken line in FIG. We considered doing. However, when such non-linear control is performed, the same target outlet temperature TAO
However, the amount of air blow varies according to the outside air temperature (Tam). For this reason, the relationship between the predetermined switching value of the inside / outside air mode and the air flow rate changes, and there arises a problem that the predetermined switching value cannot always be set to a place where the change of the blowing noise is small.

It is an object of the present invention to provide an air conditioner for a vehicle which can reliably switch between the inside air mode and the outside air mode in a place where the change of the blowing noise is always small.

[0009]

In order to achieve the above object, according to the present invention, the judging means (S) for judging whether or not the cooling load in the vehicle compartment is larger than a predetermined value.
150), the determination means (S150) determines that the cooling load is larger than the predetermined value, and the air flow (BL
If W) is larger than the predetermined airflow (BLW1), only the vehicle interior air is introduced into the air-conditioning case (1), and the determination means (S1)
If it is determined in step 50) that the cooling load is larger than the predetermined value, and if the air flow rate (BLW) is smaller than the predetermined air flow rate (BLW1), outside air is introduced into the air-conditioning case (1). If it is determined in (S150) that the cooling load is smaller than the predetermined value, only the outside air is introduced into the air conditioning case (1).

[0010] With this configuration, when the vehicle interior is rapidly cooled, if the air volume is larger than the predetermined air volume, only the vehicle interior air is introduced into the air conditioning case. For this reason, the cooling capacity can be improved. On the other hand, when the air volume becomes smaller than the predetermined air volume while cooling the vehicle interior, air outside the vehicle interior is introduced into the air conditioning case. As a result, ventilation of the vehicle interior can be performed. That is, in the present invention, the switching from the state in which only the vehicle interior air is introduced into the air-conditioning case to the state in which the vehicle interior air is introduced into the air-conditioning case is determined by the amount of air blown. Has a one-to-one relationship with the airflow rate. As a result, the above switching value is always changed in a place where the change of the blowing noise is small,
And it can be set to a place where the cooling capacity is sufficiently obtained.

When the cooling load is smaller than a predetermined value, it is not necessary to increase the cooling capacity, so that only the outside air is introduced into the air-conditioning case. Performance can be improved. According to the second aspect of the present invention, there is provided a means for calculating, as the air-conditioning environment information, at least a value related to a deviation between the vehicle interior temperature (Tr) and the vehicle interior set temperature (Tset). In S140), the air flow rate (BLW) is determined based on the value related to the deviation between the vehicle interior temperature (Tr) and the vehicle interior set temperature (Tset) and at least one of the air conditioning environment information (Tam). Information (Tam)
Is characterized in that even if the target blowing temperature (TAO) is the same, the blowing amount (BLW) is set to a different value.

According to this, not only the value related to the deviation between the vehicle interior temperature (Tr) and the vehicle interior set temperature (Tset), but also at least one of the air conditioning environment information (Ta).
By determining the air flow rate (BLW) based on m), it is possible to obtain an air flow rate that matches the air conditioning feeling required by the occupant. Further, even if the air volume changes in accordance with the change in the air conditioning environment information, the switching of the inside / outside air mode is performed based on the air volume, so that the inside / outside air mode can always be switched in a place where the change in the ventilation noise is small. it can.

The value relating to the deviation between the vehicle interior temperature (Tr) and the vehicle interior set temperature (Tset) in claim 2 is the vehicle interior temperature (Tr).
And the deviation of the conditioned air calculated based on at least the vehicle interior temperature (Tr) and the vehicle interior set temperature (Tset), as described in claim 4. This is the target outlet temperature (TAO).

According to the fifth aspect of the present invention, when the cooling load is larger than a predetermined value, the air flow rate control means (S
140), the lower the target outlet temperature (TAO),
The blower volume (BLW) is increased, and at least one of the air conditioning environment information is the vehicle exterior temperature (Tam). Even if the target blowout temperature (TAO) is the same, the lower the vehicle exterior temperature (Tam), It is characterized in that the air flow (BLW) is increased.

Here, the technical background of claim 5 will be described. In the middle period such as spring and autumn, the outside air temperature is a temperature that does not feel hot or cold, so that the target outlet temperature is a certain value in the middle region. It has become. And, for example,
Even if the occupant wants to blow out a lot of cold conditioned air and operates the temperature setting device to slightly lower the set temperature, the target outlet temperature does not decrease to a sufficiently low value as in summer. For this reason, as can be seen from FIG. 4, the amount of air blow is unlikely to be a large value, so that it is not possible to satisfy the passenger's desire to increase the amount of cool air.

For example, in the middle stage (outside air temperature 20 ° C. in FIG. 4)
It is assumed that the set temperature is 25 ° C., the vehicle interior temperature is also 25 ° C., and the target outlet temperature is in the intermediate region. Then, it is assumed that the set temperature is lowered from this state and the target outlet temperature moves from b to d in FIG. At this time, if only the characteristic line (outside air temperature 30 ° C.) shown by the solid line in FIG. 4 is set, the blower voltage BLW remains at the minimum value and the amount of cool air cannot be increased.

However, according to the invention described in claim 5,
Even if the target outlet temperature is the same, the blower voltage BLW is determined to increase as the vehicle outside temperature decreases. Therefore, the target outlet temperature is set to the value shown in FIG. When moving from b to d, the air volume becomes larger than the minimum value. As a result, it is possible to respond to the demand of the occupant and improve the air conditioning feeling.

The cooling load can be determined by various means as described in claims 6 to 9. For example, the vehicle interior temperature (Tr) and the set temperature (T
The determination of the cooling load can be performed based on the deviation from (set). In addition, the target outlet temperature (TA
The determination of the cooling load may be performed based on O).

Further, the outside temperature of the vehicle (Ta)
The determination of the cooling load may be performed based on m). Also,
The determination of the cooling load may be made based on the outside temperature (Tam) and the amount of solar radiation (Ts) into the vehicle interior. According to the tenth aspect of the present invention, when the cooling load is determined to be larger than the predetermined value and the air flow rate (BLW)) is smaller than the predetermined air flow rate (BLW1), the air outside the vehicle compartment and the vehicle air in the air-conditioning case (1). A semi-inside air mode for introducing both indoor air is set.

According to this, when the air volume is smaller than in the inside air mode, the air conditioner is switched from the inside air mode to the semi-inside air mode, and the cooling capacity can be ensured while ventilating the vehicle interior. In the invention according to claim 11, during cooling,
If the air volume (BLW) is larger than the predetermined air volume (BLW1), only the vehicle interior air is introduced into the air-conditioning case (1), and the air volume (BLW) is reduced to the predetermined air volume (BLW1) during cooling.
If smaller, air outside the vehicle compartment is introduced into the air conditioning case (1).

According to this, since the switching between the inside and outside air modes can always be performed based on the amount of air blow, even if the amount of air blow changes according to the air conditioning environment conditions, the switching point of the inside and outside air mode always changes the air noise. Can be reliably set in a small area. In addition, the code | symbol in the parenthesis of each said means shows the correspondence with the concrete means of embodiment mentioned later.

[0022]

Next, an embodiment of the present invention will be described with reference to the drawings. (First Embodiment) FIG. 1 shows the overall configuration of a vehicle air conditioner. The air conditioner for a vehicle has an air conditioning case 1 forming an air flow path of conditioned air blown into a vehicle interior. An air inlet 2 for sucking inside air (vehicle air) and an outside air inlet 3 for sucking outside air (outside air) are formed in the air upstream side portion of the air conditioning case 1.

An inside / outside air switching door 4 is rotatably provided at the air upstream side of the air conditioning case 1. The inside air inlet 2 is opened and the outside air inlet 3 is closed by the door 4. An inside air circulation mode (hereinafter, inside air mode) in which only inside air is introduced into the air conditioning case 1, and outside air introduction in which only outside air is introduced into the air conditioning case 1 by closing the inside air intake port 2 and opening the outside air intake port 3. Mode (hereinafter, the outside air mode). The inside / outside air switching door 4 is provided with a servo motor 33 as a driving means (see FIG. 2).
Driven by

The outside air inlet 3 is formed above a dash panel (not shown) that separates the interior of the vehicle from the interior of the vehicle. Downstream of the inside / outside air switching door 4, a fan 5, which is a blower that blows conditioned air toward the vehicle interior, is disposed in the air-conditioning case 1. The fan 5 is driven by a blower motor 6 as drive means, and the number of rotations of the fan, that is, the amount of air blown into the vehicle interior is controlled by the blower voltage applied to the blower motor 6. The blower voltage is determined by the air conditioning control device 26 (see FIG. 2).

An evaporator 7 as a cooling heat exchanger is provided downstream of the fan 5. The evaporator 7 includes a refrigeration cycle 14 in which a condenser 10, a receiver 11, and a pressure reducing means 12 (specifically, an expansion valve) are connected by a refrigerant pipe 13 in addition to a compressor 9 driven by an automobile engine 8. Is a heat exchanger that constitutes a part of. In addition, 1
5 is a cooling fan for the condenser 10. Further, the air-conditioning case 1 is provided with a condensed water discharge port 16 for discharging the condensed water generated by the evaporator 7 to the outside of the air-conditioning case 1.

In the air conditioning case 1, a heater core 17 as a heating heat exchanger is disposed downstream of the evaporator 7 in the air. The heater core 17 is a hot water heat exchanger in which cooling water (hot water) of the engine 8 flows, and heats air passing through the cooling water as a heat source. In the air conditioning case 1, upstream of the air from the heater core 17, an air mix for adjusting the air flow rate of the cool air from the evaporator 7 that passes through the heater core 17 and the air flow rate that passes through the bypass passage 18 that bypasses the heater core 17. A door 19 is rotatably provided. The air mix door 19 is a temperature adjusting means for adjusting the temperature of the air blown into the vehicle cabin by adjusting the air flow rate, and a servo motor 34 as a driving means.
(See FIG. 2) to adjust the amount of rotation.

Further, at the most downstream side of the air conditioning case 1,
A face outlet 20 for blowing air-conditioned air to the upper body of the passenger in the passenger compartment, a foot outlet 21 for discharging air to the feet of the passenger in the passenger compartment, and a defroster for discharging air toward the inner surface of the windshield 23. An outlet 22 is formed. Outlet mode switching doors 24 and 25 are rotatably provided at upstream portions of the outlets 20 to 22. By switching the flow paths of the doors 24 and 25, a face mode in which conditioned air is blown out from the face outlet 20, a foot mode in which conditioned air is blown out from the foot outlet 21, and conditioned air is blown out from the face outlet 20 and the foot outlet 21. The bi-level mode and the defroster mode in which the conditioned air is blown out from the defroster outlet 22 can be selected. Note that these outlet mode switching doors 24, 25
Are servo motors 35 and 36 as driving means, respectively.
(See FIG. 2).

Next, the configuration of the control system of the vehicle air conditioner will be described with reference to FIG. Various sensors are connected to the air-conditioning control device 26 as means for detecting air-conditioning environment information that affects the air-conditioning environment in the vehicle cabin. Specifically, the air-conditioning control device 26 includes an inside air temperature sensor 27 serving as a vehicle interior temperature detection unit, an outside air temperature sensor 28 serving as an outside air temperature detection unit, and a detection unit for detecting the amount of solar radiation radiated into the vehicle interior. A solar radiation sensor 29, a water temperature sensor 30 for detecting the temperature of the engine cooling water flowing into the heater core 17, and an evaporation for detecting the degree of cooling of the evaporator 7 (specifically, the air temperature immediately after passing through the evaporator 7). The container temperature sensors 31 are connected, and signals from these sensors are input.

Further, various operation switches on a control panel 32 provided on an instrument panel in the vehicle compartment are connected to the air conditioning control device 26, and signals from these operation switches are input. As the operation switches of the control panel 32, for example, a temperature setting device 32a, which is a means for setting a set temperature in the vehicle compartment, and an automatic switch (not shown) for performing an air-conditioning automatic control process described later are provided. .

A well-known microcomputer including a CPU, a ROM, and a RAM (not shown) is provided inside the air-conditioning control device 26. The signals from the sensors 27 to 31 and the operation switches of the control panel 32 are used to control the air-conditioning control. The input circuit (not shown) in device 26
After being D-converted, it is configured to be input to the microcomputer. The air-conditioning control device 26
When an ignition switch (not shown) of the engine 8 is turned on, power is supplied from a vehicle battery (not shown).

Next, an automatic air-conditioning control process by the microcomputer of the air-conditioning control device 26 will be described with reference to the flowchart of FIG. When the automatic switch of the control panel 32 is turned on in a state where the ignition switch is turned on and power is supplied to the air conditioning control device 26, the routine of FIG. 3 is started. First, in step S100, an initialization process is performed, and in the next step S1
At 10, the temperature setting device 3 of the control panel 32
Read the set temperature Tset set in 2a, and then
In step S120, signals (Tr, Tam, Ts, Tw, T) obtained by A / D converting the detection values of the sensors 27 to 31 are described.
e) read.

Subsequently, in step S130, a target blow-out temperature (TAO) of the conditioned air blown into the vehicle compartment is calculated based on the following equation (1).

[0033]

## EQU1 ## TAO = Kset × Tset−Kr × Tr−Kam ×
Tam−Ks × Ts + C where Kset, Kr, Kam and Ks are gains,
C is a correction constant. Next, in step S140,
Based on the TAO, the amount of air-conditioning air blown by the fan 5 (the voltage applied to the blower motor 6,
W) is determined by searching from the map of FIG. 4 stored in the ROM.

Specifically, in FIG. 4, during cooling in summer, the region on the left side of FIG. 4 where the TAO is low is a region where the cooling load is large, and in the region where the TAO is lower than the predetermined value a, T A
As AO decreases, the blower voltage BLW increases and T
When AO decreases to a certain value, the blower voltage BLW is saturated and becomes constant. Then, in the middle region of TAO (the middle part in FIG. 4, for example, the middle period such as spring and autumn), the blower voltage BLW is determined to be constant at the lowest value regardless of the change of TAO. Further, during heating in winter, in a region where TAO is high (right side in FIG. 4), the blower voltage BLW increases as the TAO increases, and when the TAO increases to a certain value, the blower voltage BLW is saturated and becomes constant.

In this example, a plurality of maps shown in FIG. 4 are actually provided in the ROM, and a plurality of maps are shown in FIG. 4 at the same time. As you can see from this,
In this example, even if the same TAO is used, the outside air temperature (Tam)
The blower voltage BLW is determined to be different depending on the air conditioner, and during cooling, the blower voltage BLW is determined to increase as the outside air temperature decreases.

Specifically, when the outside air temperature is 30 ° C. in a low TAO region, the TAO decreases and the blower voltage BLW
Starts to increase when TAO is the predetermined value a, and the characteristic line in this case is a solid line in FIG. Also, TA
When the outside air temperature is 20 ° C. in the low O region, TAO decreases and the blower voltage BLW starts to increase because TAO is a predetermined value b which is higher than the predetermined value a. In this case, the characteristic line is In FIG. 4, a dashed line is shown.

In the low TAO region, the outside air temperature is 1
In the case of 0 ° C., the reason that TAO decreases and the blower voltage BLW starts to increase is that TAO has a predetermined value c higher than the predetermined value b, and the characteristic line in this case is a broken line in FIG. As described above, as the outside air temperature decreases, the blower voltage BLW starts increasing at a high TAO temperature (a <b <c).
Becomes When the outside air temperature is other than 10, 20, and 30 ° C., interpolation correction is performed based on a map of the outside air temperatures of 10, 20, and 30 ° C.

The reason for this will be described below. In the middle period such as spring and autumn, the outside air temperature is an intermediate temperature that does not feel hot or cold, so that the TAO has a certain value in the above-mentioned intermediate region (for example, b in FIG. 4) even when the air conditioning is started. . Then, in the interim period, the occupant wants to blow out a lot of cold air-conditioned air, so that the temperature setting device 32a
Even if the set temperature is slightly lowered by operating
In this case, since the outside air temperature is lower than in summer, the TAO only slightly moves from b to d in FIG. 4 and does not drop to a sufficiently low value as in summer. Therefore, as can be seen from FIG. 4, the blower voltage BLW remains at the minimum value, and the amount of cool air flowing into the vehicle interior does not increase, which is contrary to the passenger's request.

Therefore, in this embodiment, the demand of the occupant is satisfied by changing the blower voltage BLW according to the outside air temperature. For example, in the intermediate period (the outside air temperature 20 in FIG. 4).
C.), the set temperature is 25 ° C., the vehicle interior temperature is also 25 ° C., and TAO is in the middle region b. Then, it is assumed that the set temperature is lowered from this state and TAO becomes d in FIG. At this time, the characteristic line indicated by the solid line in FIG.
(0 ° C.), the blower voltage BLW remains at the lowest value.

However, in this example, even if the target outlet temperature TAO is the same, the lower the vehicle exterior temperature (Tam),
The blower voltage BLW is determined to increase. Specifically, according to the characteristic of the outside air temperature of 20 ° C.
Due to the change to d, the blower voltage BLW becomes larger than the minimum value, and the amount of cool air flowing into the vehicle interior can be increased, so that it is possible to meet the demand of the occupant.

Further, in this example, even in a region where TAO is high (during heating), the outside air temperature (T
am), the blower voltage BLW is determined to be different. That is, as the outside air temperature increases, the blower voltage BL
W is determined to be high. In this example, the blower voltage BLW is determined by the broken line in FIG. 4 when the outside air temperature is 10 ° C. or higher, and is changed to the solid line in FIG. 4 when the outside air temperature is 0 ° C. or lower. Is determined. In addition, when the outside air temperature is 0 ° C or lower and other than 10 ° C or higher, the outside air temperature is 0 ° C
Interpolation correction is performed based on the values in the following map and the map where the outside air temperature is 10 ° C. or higher.

The reason for this is that when the occupant raises the set temperature in the middle period such as spring and autumn, the blower voltage B
This is because the LW is increased and the amount of warm air into the vehicle compartment is increased to respond to the passenger's request. Next, in step S150, switching of the inside / outside air mode, that is, the inside air introduction amount into the air conditioning case 1 and the outside air introduction amount into the air conditioning case 1 are determined. The details of this processing will be described later.

Further, in step S160, the TAO
Is determined by searching from the map of FIG. 5 stored in the ROM. continue,
In step S170, the target opening degree (SW) of the air mix door 19 is calculated based on the following equation 2 so that the temperature of the air blown into the vehicle compartment matches the above TAO.

[0044]

## EQU00002 ## SW = ((TAO-Te) / (Tw-Te)). Times.100 (%) Next, in step S180, each of the above steps S140 to S140 is performed.
A control signal is output to each actuator so that each mode determined or calculated in 170 is obtained. Then, in step S190, after elapse of the control cycle time τ, the process returns to step S110.

Next, the details of step S150 will be described with reference to FIG. First, in step S151,
It is determined whether the cooling load in the vehicle interior is larger than a predetermined value. In this example, the magnitude of the cooling load is determined by determining whether or not the vehicle is in a cool-down state in which the vehicle interior is rapidly cooled when the vehicle interior is abnormally hot, such as immediately after parking under the scorching sun in summer. It is determined based on Specifically, in step S151 in the present example, it is determined from the map shown in FIG. 7 whether or not the inside air temperature (Tr) is higher than the set temperature (Tset) by a predetermined temperature T2 (for example, 5 ° C.). I have.

That is, when the inside air temperature is higher than the predetermined temperature, the vehicle interior is being cooled, and when the inside air temperature is higher than the set temperature by the predetermined temperature T2 or more, the vehicle interior is rapidly cooled. Can be determined. If the result of the determination in the map of FIG. 7 is YES and it is determined that the vehicle interior is rapidly cooling (cool-down state), it is determined that the cooling load is larger than the predetermined value, and the process proceeds to step S152. Determine the inside / outside air mode.

Here, the inside / outside air mode in this example is
In addition to the above-described inside air mode and outside air mode, a switching between a semi-inside air mode in which both the inside air and the outside air are introduced into the air conditioning case 1 can be set. In the semi-inside air mode, the opening degree (operation position) of the inside / outside air switching door 4 in FIG. 1 is set to an intermediate position in an operation range s (indicated by an arrow in FIG. 1). Thereby, both inside air and outside air are simultaneously introduced into the air conditioning case 1. In this example, the ratio of the amount of inside air introduced into the air-conditioning case 1 and the amount of outside air introduced into the air-conditioning case 1 in the semi-inside air mode can be linearly controlled.

For example, if the opening degree of the inside / outside air switching door 4 in the outside air mode is 0% and the opening degree of the inside / outside air switching door 4 in the inside air mode is 100%, the opening degree of the inside / outside air switching door 4 is set. Has a relationship as shown in FIG. Here, as shown in FIG. 8, the inside / outside air mode is determined such that the opening degree of the inside / outside air switching door 4 increases as the blower voltage BLW increases. Thus, the switching between the inside and outside air modes in this example is performed as follows.

For example, in FIG. 4, the outside air temperature is 30 ° C., TAO becomes a very low value, and the blower voltage BL
It is assumed that W is the maximum value (leftmost in FIG. 4). In this case, from the viewpoint of securing the cooling capacity, the inside / outside air mode needs to be the inside air mode, and since the blower voltage BLW is the maximum, the inside / outside air mode is determined to be the inside air mode from the map of FIG. You.

Then, the cabin is cooled with the maximum amount of the air-conditioned air blown, and the inside air temperature decreases as the cabin is cooled. It shifts to. Therefore, the blower voltage BLW gradually decreases from the maximum value. Then, when the blower voltage BLW becomes lower than the predetermined blower voltage (predetermined air volume) BLW1 shown in FIG. 8, in other words,
When the airflow of the conditioned air is smaller than the predetermined airflow, the mode is switched to the semi-inside air mode, and outside air is introduced into the air-conditioning case 1.

In summary, when the interior of the vehicle is rapidly cooled and the air flow is larger than the predetermined air flow, only the inside air is introduced into the air conditioning case 1. For this reason, the cooling capacity can be improved. On the other hand, when the air volume becomes smaller than the predetermined air volume while cooling the vehicle interior, outside air is introduced into the air conditioning case 1. For this reason, the ventilation in the vehicle interior can be performed. As described above, in this example, when the air volume of the conditioned air is smaller than the predetermined air volume while the vehicle interior is being cooled, the inside air mode in which only the inside air is introduced into the air conditioning case 1 is changed to the outside air and the inside air inside the air conditioning case 1. Since the mode is switched to the semi-inside air mode in which both are introduced, even if the air volume is changed depending on the outside air temperature during the cooling of the vehicle interior, the air volume and the opening degree of the inside / outside air switching door 4 have a one-to-one relationship.
That is, the opening degree of the inside / outside air switching door 4 is always determined by the blower voltage BLW (air volume) as shown in FIG.

Therefore, in this embodiment, the switching value (BLW1) for switching from the inside air mode to the half inside air mode can be set to a point where the noise change is always small and sufficient cooling capacity can be obtained. If the determination result in step S151 in FIG. 6 is NO (see the map in FIG. 7) and the cooling load is smaller than the predetermined value (for example, spring, autumn, and winter as a season), there is no need to increase the cooling capacity. Then, the outside air mode is determined as the inside / outside air mode. Thus, for example, ventilation of the vehicle interior can be performed in winter and the anti-fog property of the vehicle window glass can be improved.

In the flowchart of FIG. 3, step S130 corresponds to the target blowing temperature calculating means of the present invention, step S140 corresponds to the air blowing amount controlling means of the present invention, and step S150 corresponds to the determining means of the present invention. Make up. (Second Embodiment) In the first embodiment, as means for determining whether the cooling load in the vehicle interior is larger than a predetermined value,
Deviation between the inside air temperature Tr and the set temperature Tset (Tr−Ts
et), the TAO corresponds to the air-conditioning heat load in the vehicle cabin. Therefore, paying attention to this point, the second embodiment uses the TAO for the determination in step S151. That is, as shown in the map of FIG.
When O is lower than the predetermined value T4, it is determined that the cooling load in the vehicle compartment is larger than the predetermined value.

(Third Embodiment) In the third embodiment, attention is paid to the fact that the outside air temperature has a large effect on the air conditioning heat load in the vehicle interior, and the outside air temperature is used for the determination in step S151. That is, as shown in the map of FIG. 10, when the outside air temperature is higher than the predetermined value T6 (for example, 10 ° C.), it is determined that the cooling load in the vehicle compartment is larger than the predetermined value.

(Fourth Embodiment) In the fourth embodiment, attention is paid to the fact that both the outside air temperature and the amount of solar radiation have a large effect on the air conditioning heat load in the vehicle cabin. And both solar radiation. That is, as shown in the map of FIG. 11, two areas A and B defined by a combination of the outside air temperature and the amount of solar radiation are set, and when the outside air temperature and the amount of solar radiation are in the area A, it is determined that the cooling load is large. When the outside air temperature and the amount of solar radiation are in the region B, it is determined that the cooling load is small.

(Fifth Embodiment) In the first embodiment, FIG.
When the cooling load is determined to be large in step S151 in the flowchart of step S151, the inside / outside air mode is directly determined based on the blower voltage BLW (air volume) in step S152. However, in the fifth embodiment, FIG. as shown in, based on the blower voltage BLW for determining the air volume, first, calculates the outside air mode for blower voltage BLW _0, the outside air mode to step S152 on the basis of the outside air mode for blower voltage BLW ₀ The final decision is made.

[0057] Accordingly, it is possible to provide a predetermined deviation between the blower voltage BLW for determining the air volume into the passenger compartment, the blower voltage BLW ₀ for determining the outside air mode. Therefore, even if the blower voltage BLW ₀ fluctuates due to the input value fluctuation, the inside / outside air mode can be prevented from easily fluctuating. Sixth Embodiment In the first embodiment, as shown in FIG. 4, the blower voltage BLW is determined based on the target blowing temperature TAO and the outside air temperature Tam.
As shown in FIG. 13, the blower voltage BLW is determined based on the temperature deviation (Tset−Tr) between the set temperature Tset and the inside air temperature Tr, and the outside air temperature Tam. Even in such a case, it is possible to determine a more appropriate air flow rate according to the occupant's feeling of air conditioning as in the first embodiment.

(Modification) The air volume in the face mode and the bi-level mode in which the air volume increases in the solar radiation and the air volume in the foot mode in which the air volume does not increase in the solar radiation are separately defined as the air volume in the vehicle air conditioner. May be calculated. In this case, depending on the air volume in face mode and bi-level mode, or the air volume in foot mode,
The inside / outside air mode may be determined.

Further, in a vehicle air conditioner of a left and right independent temperature control system in which the air conditioning zone on the driver's seat side and the air conditioning zone on the passenger seat side are independently controlled, the air volume on the driver seat side and the air volume on the passenger seat side are different. Is calculated independently, so that the inside / outside air mode is determined according to the air volume at the driver's seat side, or the inside / outside air mode is determined according to the air volume at the passenger seat side, and further, the air volume at the driver's seat side The inside / outside air mode may be determined according to the average value of the air volume on the passenger seat side.

Further, in the first embodiment, as shown in FIG. 8, the inside air introduction amount and the outside air introduction amount can be switched linearly. However, the present invention is different from the inside air mode referred to in the first embodiment. The inside air mode and the outside air mode may be determined selectively (stepwise). Further, the inside / outside air mode may be selectively (stepwise) switched between the inside air mode and the outside air mode without setting the half inside air mode.

In the first embodiment, as shown in FIG. 4, the blower voltage BLW is changed at the outside air temperature.
By combining the outside air temperature and the amount of solar radiation, the blower voltage BLW
May be changed. Further, the blower voltage BLW may be changed depending on the set temperature or the inside air temperature. Further, in the first embodiment, the deviation between the inside air temperature and the set temperature is used as means for determining whether the cooling load in the vehicle compartment is larger than a predetermined value. May be determined.

Further, the present invention provides a neural control system in which, for example, the inside air temperature, the set temperature, the outside air temperature, and the amount of solar radiation are used as input variables.
It is needless to say that a device that performs non-linear control such as fuzzy operation can be applied.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a vehicle air conditioner according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a control configuration of the vehicle air conditioner according to the first embodiment.

FIG. 3 is a flowchart illustrating control contents according to the first embodiment.

FIG. 4 shows TAO and blower voltage BL in the first embodiment.
FIG. 4 is a characteristic diagram showing a relationship with W.

FIG. 5 is a characteristic diagram showing a relationship between TAO and an outlet mode in the first embodiment.

FIG. 6 is a flowchart showing control contents of a main part in the first embodiment.

FIG. 7 is a characteristic diagram showing the content of determination of a cooling load in the first embodiment.

FIG. 8 is a characteristic diagram illustrating a relationship between a blower voltage BLW and an inside / outside air mode according to the first embodiment.

FIG. 9 is a characteristic diagram showing the content of determination of a cooling load in the second embodiment.

FIG. 10 is a characteristic diagram showing a cooling load determination content according to the third embodiment.

FIG. 11 is a characteristic diagram showing a cooling load determination content in a fourth embodiment.

FIG. 12 is a characteristic diagram showing a relationship between a blower voltage BLW and an inside / outside air mode blower voltage BLW ₀ in a fifth embodiment.

FIG. 13 shows a temperature deviation (Tset−T) in the sixth embodiment.
FIG. 6 is a characteristic diagram showing a relationship between r) and a blower voltage BLW.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Air-conditioning case, 5 ... Fan, 26 ... Air-conditioning control device, 2
7: inside temperature sensor, 28: outside temperature sensor, 29: solar radiation sensor, 32a: temperature setting device.

Continuing from the front page (72) Inventor Katsuhiko Samukawa 1-1-1, Showa-cho, Kariya-shi, Aichi Pref.

Claims (11)

[Claims] An air conditioning case (1) for forming an air flow path.
A blower (5) for blowing conditioned air toward the vehicle interior into the air conditioning case (1); and air conditioning environment information (Tset
, Tr, Tam, Ts, Tw, Te), and a blower amount control means (S140) for determining and controlling the blower amount (BLW) of the blower (5). An air conditioner for a vehicle to which inside air or outside air can be introduced, comprising: a determination unit (S150) for determining whether a cooling load in a vehicle compartment is larger than a predetermined value; If it is determined that the load is greater than the predetermined value and if the air flow rate (BLW) is greater than the predetermined air flow rate (BLW1), only the vehicle interior air is introduced into the air conditioning case (1), and the determination means (S150) ), The cooling load is determined to be larger than the predetermined value, and the air flow rate (BLW))
Is smaller than the predetermined airflow (BLW1), air outside the vehicle compartment is introduced into the air conditioning case (1), and if the cooling load is determined to be smaller than the predetermined value by the determination means (S150). An air conditioner for a vehicle, wherein only air outside the vehicle compartment is introduced into the air conditioner case (1). 2. The air-conditioning environment information includes means for calculating at least a value related to a deviation between a vehicle interior temperature (Tr) and a vehicle interior set temperature (Tset). The air flow rate (BLW) based on a value related to a deviation between the vehicle interior temperature (Tr) and the vehicle interior set temperature (Tset) and at least one of the air conditioning environment information (Tam). The target outlet temperature (T) is determined by a change in the information (Tam).
2. The vehicle air conditioner according to claim 1, wherein the air flow rate (BLW) is set to a different value even if AO) is the same. 3. A value relating to a deviation between the vehicle interior temperature (Tr) and the vehicle interior set temperature (Tset) is a deviation between the vehicle interior temperature (Tr) and the vehicle interior set temperature (Tset). The vehicle air conditioner according to claim 2, wherein: 4. A value related to a deviation between the vehicle interior temperature (Tr) and the vehicle interior set temperature (Tset) based on at least the vehicle interior temperature (Tr) and the vehicle interior set temperature (Tset). The vehicle air conditioner according to claim 2, wherein the target air temperature (TAO) of the conditioned air is calculated. 5. In a state where the cooling load is larger than the predetermined value, the blower amount control means (S140) increases the blower amount (BLW) as the target blowout temperature (TAO) decreases, Is the vehicle exterior temperature (Tam), and even if the target outlet temperature (TAO) is the same, the vehicle exterior temperature (T
The vehicle air conditioner according to claim 4, wherein the blower amount (BLW) is increased as am) decreases. 6. The cooling means according to claim 2, wherein said judging means (S150) judges the cooling load based on a deviation between the cabin temperature (Tr) and the set temperature (Tset). The vehicle air conditioner according to any one of the above. 7. The air conditioner for a vehicle according to claim 4, wherein the determination unit (S150) determines the cooling load based on the target outlet temperature (TAO). 8. The air conditioner for a vehicle according to claim 1, wherein the determination unit (S150) determines the cooling load based on a vehicle outside temperature (Tam). apparatus. 9. The cooling unit according to claim 1, wherein the determination unit determines the cooling load based on a temperature outside the vehicle compartment (Tam) and a solar radiation amount into the vehicle compartment (Ts). The vehicle air conditioner according to any one of the above. 10. When the cooling load is determined to be larger than the predetermined value and the air flow rate (BLW) is smaller than the predetermined air flow rate (BLW1), the air outside the vehicle compartment is introduced into the air conditioning case (1). The vehicle air conditioner according to any one of claims 1 to 9, wherein a semi-inside air mode is set in which both air and vehicle interior air are introduced. 11. An air conditioning case (1) forming an air flow path.
A blower (5) for blowing conditioned air toward the vehicle interior into the air conditioning case (1); and air conditioning environment information (Tset
, Tr, Tam, Ts, Tw, Te), and a blower amount control means (S140) for determining and controlling the blower amount (BLW) of the blower (5). An air conditioner for a vehicle into which inside air or outside air can be introduced, wherein the air flow rate (BLW) is equal to a predetermined air flow rate (BLW) during cooling.
If it is larger than 1), only the vehicle interior air is introduced into the air-conditioning case (1). If the air volume (BLW) is smaller than the predetermined air volume (BLW1) during cooling, the air-conditioning case (1) An air conditioner for a vehicle, wherein air outside the vehicle compartment is introduced into the inside.