JP4066508B2 - Air conditioner for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to switching control of an inside / outside air mode, particularly in a vehicle air conditioner.
[0002]
[Prior art]
Conventionally, in a vehicle air conditioner, switching between the inside and outside air modes of air sucked into an air conditioning case is performed in accordance with a target blowing temperature TAO. For example, when the target blowing temperature TAO becomes lower than a predetermined switching value, the inside air mode (air in the passenger compartment) is taken into the air conditioning case in order to improve the cooling capacity, and when the target blowing temperature TAO becomes higher than the predetermined switching value, the outside air The outside air mode for sucking (air outside the passenger compartment) into the air conditioning case is set.
[0003]
The target blowing temperature TAO is a target temperature of the conditioned air blown into the vehicle interior, and is given as input information on the temperature in the vehicle interior, the outside air temperature, the amount of solar radiation entering the vehicle interior, the set temperature in the vehicle interior, and the like. It is calculated by an arithmetic expression and corresponds to the air conditioning heat load in the passenger compartment. The target blowing temperature TAO is a low value when the passenger compartment is cooled in summer, and is a high value when the passenger compartment is heated as in winter.
[0004]
In addition to the switching between the inside and outside air modes, the target blowing temperature TAO is a parameter that also determines the air flow rate of the conditioned air. Specifically, as shown by the solid line in FIG. 4, the air flow rate increases in a region where the target blowout temperature TAO is high (right side in the drawing) and a region where the target blowout temperature TAO is low (left side in the drawing), and in the intermediate region of the target blowout temperature TAO. The air volume is the smallest.
[0005]
Accordingly, both the switching between the inside / outside air mode and the airflow rate of the conditioned air have a one-to-one relationship because they are determined by the target blowing temperature TAO.
By the way, conventionally, in the vehicle air conditioner, the predetermined switching value of the inside / outside air mode is set in the following manner. That is, when the predetermined switching value is set in a region where the air flow rate of the conditioned air is very large like the high temperature region and the low temperature region of the target blow temperature TAO, the air flow rate is large when switching the inside / outside air mode. The amount of change in blowing noise due to the difference in ventilation resistance between the inside and outside air modes becomes large. As a result, an uncomfortable feeling is given to passengers in the passenger compartment, which is not preferable. Therefore, the predetermined switching value is set for each vehicle type, aiming at a place where a change in blowing noise due to the conditioned air is small and sufficient cooling capacity is obtained.
[0006]
[Problems to be solved by the invention]
By the way, in the said conventional apparatus, although the ventilation volume of air-conditioning wind is determined only by the target blowing temperature TAO, when a use environmental condition changes widely like a vehicle, only ventilation volume is simply TAO. Therefore, it is not always possible to obtain an air flow rate that matches the air conditioning sense (temperature sense) required by the occupant.
[0007]
Therefore, the present inventor performs non-linear control for correcting the air flow rate of the conditioned air according to the outside air temperature (Tam) that greatly affects the occupant's air conditioning feeling, as indicated by the one-dot chain line and the broken line in FIG. It was investigated. However, when such non-linear control is performed, the air flow rate changes according to the outside air temperature (Tam) even at the same target blowing temperature TAO. 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 at a place where the change of the blowing noise is small.
[0008]
Therefore, an object of the present invention is to provide a vehicle air conditioner that can reliably switch between the inside and outside air modes in a place where the change in the blowing noise is always small.
[0009]
[Means for Solving the Problems]
  In order to achieve the above object, claims 1 to9In the described invention, the air volume that determines and controls the air volume (BLW) of the blower (5) based on the air conditioning environment information (Tset, Tr, Tam, Ts, Tw, Te) that affects the air conditioning environment in the passenger compartment. Control means (S140);
  Inside air mode for introducing only vehicle interior air into the air conditioning case (1), outside air mode for introducing only vehicle interior air into the air conditioning case (1), vehicle interior air and vehicle interior air within the air conditioning case (1) An inside / outside air switching door (4) for switching between a semi-inside air mode that introduces both,
  Determination means (S151) for determining whether or not the cooling load in the passenger compartment is greater than a predetermined value;
  An outside air mode determining means (S153) for determining an outside air mode when the determining means (S151) determines that the cooling load is smaller than a predetermined value;
  Inside / outside air mode determining means (S152) for determining the inside / outside air mode by the inside / outside air switching door (4) based on the determination result of the determining means (S151) and the air flow (BLW),
  The inside / outside air mode determining means (S152) determines the inside air mode when it is determined by the determining means (S151) that the cooling load is larger than a predetermined value and the air flow rate (BLW) is larger than the predetermined air flow rate (BLW1). And
  When the determination unit (S151) determines that the cooling load is greater than the predetermined value and the air flow rate (BLW) is smaller than the predetermined air flow rate (BLW1), the semi-inside air mode is determined.
[0010]
  Thereby, when the vehicle interior is rapidly cooled and the air blowing amount is larger than the predetermined air blowing amount,Determine the shy modeOnly the cabin air is introduced into the air conditioning case. For this reason, the cooling capacity can be improved.
  On the other hand, if the air volume is smaller than the predetermined air volume while cooling the passenger compartment,Decide the half-shy modeIn the air conditioning caseCar interior air andCar exterior airBothIs introduced. As a result,It is possible to ensure the cooling capacity while ventilating the passenger compartment.
  In other words, in the present invention, only the cabin air is introduced into the air conditioning case.Shy modeIntroducing outside air into the air conditioning caseHalf-shy modeSince switching to the state is determined by the air flow rate, the switching value of the inside / outside air mode and the air flow rate have a one-to-one relationship. As a result, the switching value can always be set where the change in the blowing noise is small and sufficient cooling capacity can be obtained.
[0011]
  Further, when the cooling load is smaller than the predetermined value, it is not necessary to increase the cooling capacity. Therefore, the outside air mode is always determined and only the outside air is introduced into the air conditioning case. For this reason, while ventilating a vehicle interior, the anti-fogging property of a vehicle window glass can be improved.
  Claims1In the described invention, the air conditioning environment information includes means for calculating at least a value related to the deviation between the vehicle interior temperature (Tr) and the vehicle interior set temperature (Tset),
  The air flow control means (S140) sends the air flow based on a value related to the deviation between the vehicle interior temperature (Tr) and the vehicle interior set temperature (Tset) and at least one piece of information (Tam) among the air conditioning environment information. The air volume (BLW) is determined,
  Even if the value related to the deviation is the same due to the change of the information (Tam), the air flow rate (BLW) is set to a different value.
[0012]
According to this, not only the value related to the deviation between the passenger compartment temperature (Tr) and the preset passenger compartment temperature (Tset) but also the air flow rate (BLW) based on at least one piece of information (Tam) among the air conditioning environment information. By determining this, it is possible to obtain an air flow rate that matches the air conditioning feeling required by the occupant.
Also, even if the air flow changes according to changes in the air conditioning environment information, the inside / outside air mode is switched based on the air volume, so that the inside / outside air mode can always be switched in a place where the change in the blowing noise is small. it can.
[0013]
  Claims1The value related to the deviation between the vehicle interior temperature (Tr) and the vehicle interior set temperature (Tset) is2As described in the above, it is the deviation between the passenger compartment temperature (Tr) and the passenger compartment preset temperature (Tset), or3As described above, the target air temperature (TAO) of the conditioned air is calculated based on at least the vehicle interior temperature (Tr) and the vehicle interior set temperature (Tset).
[0014]
  Claims4In the described invention, in a state where the cooling load is larger than the predetermined value, the air flow rate control means (S140) increases the air flow rate (BLW) as the target air temperature (TAO) decreases, and at least one of the air conditioning environment information. Is the outside temperature (Tam) of the passenger compartment, and even if the target blowing temperature (TAO) is the same, the air flow rate (BLW) is increased as the outside temperature (Tam) of the passenger compartment decreases.
[0015]
  Where the claim4In the intermediate period such as spring and autumn, since the outside air temperature is a temperature that does not feel hot or cold, the target blowing temperature has a certain value in the intermediate region.
  For example, even if the occupant wants to blow a lot of cold conditioned air and operates the temperature setter to slightly lower the set temperature, the target blowing temperature does not drop to a sufficiently low value as in summer. For this reason, as can be seen from FIG. 4, the air flow rate is unlikely to become a large value, and thus it is impossible to satisfy the passenger's desire to increase the cold air amount.
[0016]
For example, in the intermediate period (outside air temperature 20 ° C. in FIG. 4), it is assumed that the set temperature is 25 ° C., the passenger compartment temperature is 25 ° C., and the target blowing temperature is in the intermediate region. Then, it is assumed that the set temperature is lowered from this state and the target blowing temperature is moved from b to d in FIG. At this time, if only the characteristic line (outside air temperature 30 ° C.) indicated by the solid line in FIG. 4 is set, the blower voltage BLW remains at the lowest value and the amount of cold air cannot be increased.
[0017]
  Thus, the claims4According to the described invention, even if the target outlet temperature is the same, the blower voltage BLW is determined to increase as the cabin outside temperature decreases. Therefore, the target is determined by the characteristic of the outside air temperature of 20 ° C. in the dashed line in FIG. When the blowing temperature moves from b to d in FIG. 4, the blown air amount becomes larger than the minimum value. As a result, it is possible to meet the demands of passengers and improve the air conditioning feeling.
[0018]
  In addition, the determination of the cooling load is a claim.5Or8As described in the above, various means can be adopted. For example, claims5As described above, the cooling load can be determined based on the deviation between the passenger compartment temperature (Tr) and the set temperature (Tset). Claims6As described above, the cooling load may be determined based on the target outlet temperature (TAO).
[0019]
  Claims7As described above, the cooling load may be determined based on the outside temperature (Tam) of the passenger compartment. Claims8As described above, the cooling load may be determined based on the outside temperature (Tam) of the passenger compartment and the amount of solar radiation (Ts) in the passenger compartment.
  Claim9In the described invention, claims 1 to8In the vehicle air conditioner described in any one of the above, in the semi-inside air mode, the air volume introduced into the air conditioning case (1) and the air volume outside the vehicle introduced into the air conditioning case (1) And the ratio is controlled linearly,
  The semi-inside air mode is characterized in that the ratio of the outside air introduction amount gradually increases as the air flow rate (BLW) decreases.
[0021]
In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment description later mentioned.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
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 vehicle air conditioner has an air conditioning case 1 that forms an air flow path of conditioned air that blows into the vehicle interior. An air upstream side portion of the air conditioning case 1 is formed with an inside air inlet 2 for sucking in the inside air (vehicle compartment air) and an outside air inlet 3 for sucking the outside air (vehicle outside air).
[0023]
An air / air switching door 4 is rotatably provided at a portion of the air conditioning case 1 upstream of the air. By opening the air intake 2 and closing the air intake 3 at the door 4, the air conditioning case 1 is opened. An inside air circulation mode (hereinafter referred to as an inside air mode) in which only inside air is introduced into 1 and an outside air introduction mode (hereinafter referred to as “inside air”) in which only the outside air is introduced into the air conditioning case 1 by closing the inside air inlet 2 and opening the outside air inlet 3. , Outside air mode). The inside / outside air switching door 4 is driven by a servo motor 33 (see FIG. 2) as a driving means.
[0024]
The outside air inlet 3 is formed on the upper side of a dash panel (not shown) that partitions the vehicle interior and the vehicle exterior.
A fan 5, which is a blower that blows conditioned air toward the vehicle interior, is disposed in the air conditioning case 1 at a downstream portion of the inside / outside air switching door 4. The fan 5 is driven by a blower motor 6 as driving means, and the number of rotations of the fan, that is, the amount of air blown into the passenger compartment is controlled by a blower voltage applied to the blower motor 6. The blower voltage is determined by the air conditioning control device 26 (see FIG. 2).
[0025]
On the downstream side of the fan 5, an evaporator 7 that is a cooling heat exchanger is disposed. The evaporator 7 has a refrigeration cycle 14 in which a condenser 10, a receiver 11, and a decompression 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. It is the heat exchanger which comprises a part of. Reference numeral 15 denotes a cooling fan for the condenser 10. Further, the air conditioning case 1 is formed 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.
[0026]
In the air conditioning case 1, a heater core 17, which is a heat exchanger for heating, is disposed on the air downstream side of the evaporator 7. 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, on the air upstream side of the heater core 17, an air mix that adjusts the air volume ratio passing through the heater core 17 and the air volume ratio passing through the bypass passage 18 bypassing the heater core 17 out of the cold air from the evaporator 7. A door 19 is rotatably arranged. The air mix door 19 is a temperature adjusting means for adjusting the temperature of air blown into the passenger compartment by adjusting the air volume ratio, and is driven by a servo motor 34 (see FIG. 2) as a driving means to adjust the amount of rotation. The
[0027]
Further, at the most downstream part 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 blowing air to the feet of the passenger in the passenger compartment, and the windshield A defroster outlet 22 for blowing air toward the inner surface of 23 is formed.
Air outlet mode switching doors 24 and 25 are rotatably disposed at upstream portions of the air 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. A bi-level mode and a defroster mode in which conditioned air is blown from the defroster outlet 22 can be selected. The outlet mode switching doors 24 and 25 are driven by servo motors 35 and 36 (see FIG. 2) as driving means, respectively.
[0028]
Next, the configuration of the control system of the vehicle air conditioner will be described with reference to FIG. The air-conditioning control device 26 is connected with various sensors that are means for detecting air-conditioning environment information that affects the air-conditioning environment in the passenger compartment. Specifically, the air conditioning control device 26 includes an inside air temperature sensor 27 that is a vehicle interior temperature detecting means, an outside air temperature sensor 28 that is an outside air temperature detecting means, and a solar radiation amount detecting means that is radiated into the vehicle interior. The solar radiation sensor 29, the water temperature sensor 30 that is a means for detecting the engine cooling water flowing into the heater core 17, and the evaporation that is a means for detecting the degree of cooling of the evaporator 7 (specifically, the air temperature immediately after passing through the evaporator 7). Temperature sensor 31 is connected, and signals from these sensors are input.
[0029]
Further, various operation switches on a control panel 32 disposed on the instrument panel in the vehicle interior are connected to the air conditioning control device 26, and signals from these operation switches are input. As the operation switch of the control panel 32, for example, a temperature setter 32a which is a setting means for setting a temperature in the passenger compartment, an automatic switch (not shown) for performing an air conditioning automatic control process described later, and the like are provided. .
[0030]
Inside the air conditioning control device 26, a well-known microcomputer comprising a CPU, ROM, RAM, etc. (not shown) is provided, and signals from the sensors 27 to 31 and the operation switches of the control panel 32 are sent to the air conditioning control device 26. After being A / D converted by an input circuit (not shown), it is input to the microcomputer. The air conditioning control device 26 is supplied with power from a vehicle battery (not shown) when an ignition switch (not shown) of the engine 8 is turned on.
[0031]
Next, the air conditioning automatic control processing by the microcomputer of the air conditioning control device 26 will be described with reference to the flowchart of FIG. 3 is started when the automatic switch of the control panel 32 is turned on in a state in which the ignition switch is turned on and power is supplied to the air conditioning control device 26.
First, in step S100, initialization processing is performed. In next step S110, the set temperature Tset set by the temperature setter 32a of the control panel 32 is read. Next, in step S120, the sensor 27 is set. Signals (Tr, Tam, Ts, Tw, Te) obtained by A / D converting the respective detection values of .about.31 are read.
[0032]
Subsequently, in step S130, a target blowing temperature (TAO) of the conditioned air blown into the vehicle interior is calculated based on the following formula 1.
[0033]
[Expression 1]
TAO = Kset * Tset-Kr * Tr-Kam * Tam-Ks * Ts + C
Kset, Kr, Kam, and Ks are gains, and C is a correction constant.
Next, in step S140, based on the TAO, the amount of conditioned air blown by the fan 5 (the voltage applied to the blower motor 6, which is called the blower voltage BLW) is searched from the map of FIG. 4 stored in the ROM. Decide by.
[0034]
Specifically, in FIG. 4, when cooling in summer, the low TAO region on the left side in FIG. 4 is a region where the cooling load is large, and in the region where TAO is lower than a predetermined value a, the lower the TAO, the lower the blower voltage. When BLW increases and TAO decreases to a certain value, the blower voltage BLW is saturated and becomes constant.
In the intermediate region of TAO (the central portion in FIG. 4, for example, the intermediate period such as spring and autumn), the blower voltage BLW is determined to be constant at the lowest value regardless of the change in TAO. Also, during heating in winter, in a region where TAO is high (right side in FIG. 4), the higher the TAO, the higher the blower voltage BLW. When the TAO increases to a certain value, the blower voltage BLW becomes saturated and becomes constant.
[0035]
In this example, a plurality of maps in FIG. 4 are actually provided in the ROM, and a plurality of maps are shown in FIG. 4 at the same time. As can be seen from this, in this example, even for the same TAO, the blower voltage BLW is determined to be different according to the outside air temperature (Tam), and the blower voltage BLW becomes lower as the outside air temperature becomes lower during cooling. Determined to be higher.
[0036]
Specifically, when the outside air temperature is 30 ° C. in a region where TAO is low, the TAO decreases and the blower voltage BLW begins to increase when the TAO is the predetermined value a, and the characteristic line in this case is shown in FIG. 4 solid line. Further, when the outside air temperature is 20 ° C. in the region where TAO is low, the TAO decreases and the blower voltage BLW starts to increase. The TAO becomes a predetermined value b higher than the predetermined value a. A line becomes a dashed-dotted line in FIG.
[0037]
Further, when the outside air temperature is 10 ° C. in a region where TAO is low, the TAO decreases and the blower voltage BLW starts to increase. The TAO becomes a predetermined value c higher than the predetermined value b, and the characteristics in this case The line is a broken line in FIG. Thus, as the outside air temperature decreases, the TAO at which the blower voltage BLW starts to increase becomes a high temperature (a <b <c). When the outside air temperature is other than 10, 20, and 30 ° C., interpolation correction is performed based on the map of the outside air temperature 10, 20, and 30 ° C.
[0038]
The reason for this will be described below. In the intermediate period such as spring and autumn, since the outside air temperature is an intermediate temperature that does not feel hot or cold, the TAO has a certain value (for example, b in FIG. 4) in the above-described intermediate region even when air conditioning is started. . And even if the occupant wants to blow a lot of cold air-conditioning air in the intermediate period and operates the temperature setting device 32a to slightly lower the set temperature, the outside air temperature is lower than the summer time in Equation 1 above. The TAO only moves slightly from b to d in FIG. 4 and does not decrease to a sufficiently low value as in summer. For this reason, as can be seen in FIG. 4, the blower voltage BLW remains at the lowest value, and the amount of cold air into the passenger compartment does not increase, which conflicts with the passenger's request.
[0039]
Therefore, in this example, the blower voltage BLW is changed according to the outside air temperature to satisfy the passenger's request. For example, in the intermediate period (outside air temperature 20 ° C. in FIG. 4), the set temperature is 25 ° C., the passenger compartment temperature is also 25 ° C., and TAO is b in the intermediate region. Then, assume that the set temperature is lowered from this state and TAO becomes d in FIG. At this time, if there is only a characteristic line (outside air temperature 30 ° C.) indicated by a solid line in FIG. 4, the blower voltage BLW remains at the lowest value.
[0040]
However, in this example, even if the target outlet temperature TAO is the same, the blower voltage BLW is determined to increase as the passenger compartment temperature (Tam) decreases. Specifically, the blower voltage BLW becomes larger than the minimum value due to the change from b to d according to the characteristic of the outside air temperature of 20 ° C on the one-dot chain line, and the amount of cold air into the passenger compartment can be increased. We can meet your needs.
[0041]
In this example, even in a region where the TAO is high (during heating), the blower voltage BLW is determined to be different according to the outside air temperature (Tam) for the same TAO. That is, the blower voltage BLW is determined to increase as the outside air temperature increases. In this example, the blower voltage BLW is determined by a characteristic line indicated by a broken line in FIG. 4 when the outside air temperature is 10 ° C. or higher, and is represented by a solid characteristic line in FIG. 4 when the outside air temperature is 0 ° C. or lower. Determined. When the outside air temperature is other than 0 ° C. or lower and 10 ° C. or higher, interpolation correction is performed based on the values in the map where the outside air temperature is 0 ° C. or lower and the map where the outside air temperature is 10 ° C. or higher.
[0042]
The reason for this is to respond to passengers' demands by increasing the blower voltage BLW and increasing the amount of warm air into the passenger compartment when the passenger raises the set temperature in the intermediate period such as spring and autumn. is there.
Next, in step S150, switching between the inside and outside air modes, that is, 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 are determined. Details of this processing content will be described later.
[0043]
In step S160, the air outlet mode corresponding to the TAO is determined by searching from the map of FIG. 5 stored in the ROM.
Subsequently, in step S170, a target opening degree (SW) of the air mix door 19 is calculated based on the following mathematical formula 2 so that the temperature of the air blown into the vehicle interior matches the TAO.
[0044]
[Expression 2]
SW = ((TAO−Te) / (Tw−Te)) × 100 (%)
In step S180, a control signal is output to each actuator so that the modes determined or calculated in steps S140 to 170 can be obtained. In step S190, after the control cycle time τ has elapsed, the process returns to step S110.
[0045]
Next, details of step S150 described above will be described with reference to FIG. First, in step S151, it is determined whether or not the cooling load in the passenger compartment is greater than a predetermined value. In this example, whether the cooling load is large or small is determined based on 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 in hot weather. Judgment based on. Specifically, in step S151 in this example, it is determined from the map shown in FIG. 7, and it is determined whether or not the inside air temperature (Tr) is higher than the set temperature (Tset) by a predetermined temperature T2 (for example, 5 ° C.). Yes.
[0046]
That is, when the inside air temperature is higher than the predetermined temperature is when 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, it can be determined that the vehicle interior is being rapidly cooled. . If the determination result in the map of FIG. 7 is YES and it is determined that the vehicle interior is being rapidly cooled (cool down state), the cooling load is considered to be greater than the predetermined value, and the process proceeds to step S152. Determine the inside / outside air mode.
[0047]
Here, in the inside / outside air mode in this example, in addition to the above-described inside air mode and outside air mode, a semi-inside air mode in which both inside air and outside air are introduced into the air conditioning case 1 can be switched and set.
In the semi-inside air mode, the opening degree (operating position) of the inside / outside air switching door 4 in FIG. Thereby, both the inside air and the outside air are introduced into the air conditioning case 1 at the same time. In this example, the ratio between 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.
[0048]
For example, when 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 as shown in FIG. The relationship is as shown in FIG.
Here, as shown in FIG. 8, the inside / outside air mode is determined so that the opening degree of the inside / outside air switching door 4 increases as the blower voltage BLW increases. Thereby, switching of the inside / outside air mode in this example is performed as follows.
[0049]
For example, in FIG. 4, it is assumed that the outside air temperature is 30 ° C., TAO is a very low value, and the blower voltage BLW is the maximum value (the leftmost side in FIG. 4). In this case, from the viewpoint of securing the cooling capacity, the inside / outside air mode needs to be set to the inside air mode, and the blower voltage BLW is the maximum. Therefore, the inside / outside air mode is determined as the inside air mode from the map of FIG. The
[0050]
Then, the interior of the passenger compartment is cooled with the maximum amount of conditioned air blown, and the inside air temperature decreases as the interior of the passenger compartment is cooled. Therefore, TAO gradually increases according to Equation 1 above, and shifts to the right side in FIG. To go. For this reason, the blower voltage BLW gradually decreases from the maximum value. When the blower voltage BLW becomes lower than the predetermined blower voltage (predetermined air flow) BLW1 shown in FIG. 8, in other words, when the air flow of the conditioned air becomes smaller than the predetermined air flow, the mode is switched to the semi-inside air mode. Outside air is introduced.
[0051]
In summary, when the vehicle interior is rapidly cooled and the air flow rate is larger than the predetermined air flow rate, 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, outside air is introduced into the air conditioning case 1 when the air volume becomes smaller than the predetermined air volume while the vehicle interior is being cooled. For this reason, the vehicle interior can be ventilated.
In this way, in this example, when the air volume of the conditioned air is smaller than the predetermined air volume while the passenger compartment is being cooled, the outside air and the inside air are introduced into the air conditioning case 1 from the inside air mode in which only the inside air is introduced into the air conditioning case 1. In order to switch to the semi-inside air mode in which both are introduced, even if the air flow rate is changed by the outside air temperature during cooling of the vehicle interior, the air flow rate 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.
[0052]
Therefore, in this example, the switching value (BLW1) for switching from the inside air mode to the semi-inside air mode can be set to a point where noise change is always small and sufficient cooling capacity can be obtained.
Further, 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 a predetermined value (for example, spring, autumn and winter as a season), it is not necessary to increase the cooling capacity, so the process proceeds to step S153. Then, the outside air mode is determined as the inside / outside air mode. Thereby, for example, while the vehicle interior is ventilated in winter, the antifogging property of the vehicle window glass can be improved.
[0053]
  In the flowchart of FIG. 3, step S130 is the target blowing temperature calculation means of the present invention, and step S140 is the blowing amount control means of the present invention.Each is composed.Also,In FIG.Step S151Is the determination means of the present inventionTheIt is composed.
[0054]
(Third embodiment)
In the third embodiment, paying attention to the fact that the outside air temperature has a great influence on the air conditioning heat load in the passenger compartment, 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 a predetermined value T6 (for example, 10 ° C.), it is determined that the cooling load in the passenger compartment is larger than the predetermined value.
[0055]
(Fourth embodiment)
In the fourth embodiment, paying attention to the fact that both the outside air temperature and the amount of solar radiation have a great influence on the air conditioning heat load in the passenger compartment, both the outside air temperature and the amount of solar radiation are used for the determination in step S151. . That is, as shown in the map of FIG. 11, two areas A and B partitioned 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.
[0056]
(Fifth embodiment)
In the first embodiment, when it is determined in step S151 that the cooling load is large in the flowchart of FIG. 6, the inside / outside air mode is directly determined based on the blower voltage BLW (air flow) in step S152. In the fifth embodiment, as shown in FIG. 12, first, the blower voltage BLW for the inside / outside air mode is based on the blower voltage BLW that determines the air flow rate.₀The blower voltage BLW for the inside / outside air mode is calculated.₀The inside / outside air mode is finally determined in step S152 based on the above.
[0057]
  According to this, it is possible to provide a predetermined deviation between the blower voltage BLW that determines the amount of air blown into the vehicle interior and the blower voltage BLWo that determines the inside / outside air mode. Therefore, the blower voltage isBLWEven if fluctuates, the inside / outside air mode can be prevented from fluctuating easily.
(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. In the sixth embodiment, the blower voltage BLW is shown in FIG. As shown, 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 if it does in this way, the ventilation volume which matched according to the passenger | crew's air-conditioning feeling similarly to 1st Embodiment can be determined.
[0058]
(Modification)
In addition, as the air volume in the vehicle air conditioner, the air volume in the face mode and the bi-level mode in which the air volume increases during solar radiation and the air volume in the foot mode in which the air volume does not increase during solar radiation may be calculated separately. In this case, the inside / outside air mode may be determined according to the air volume in the face mode and the bi-level mode, or the air volume in the foot mode.
[0059]
In addition, in the air conditioning system for vehicles with independent left and right temperature control, which controls the temperature of the air conditioning zone on the driver's side and the air conditioning zone on the passenger's seat independently, the airflow on the driver's seat and the airflow on the passenger's seat are independent. Therefore, the inside / outside air mode is determined according to the air volume at the driver's seat, the inside / outside air mode is determined according to the air volume at the passenger's side, The inside / outside air mode may be determined according to the average value of the side air volume.
[0060]
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, but the present invention relates to the inside air mode and the semi-inside air mode referred to in the first embodiment. The outside air mode may be determined selectively (stepwise). Further, the inside / outside air mode may be switched selectively (stepwise) between the inside air mode and the outside air mode without setting the semi-inside air mode.
[0061]
In the first embodiment, as shown in FIG. 4, the blower voltage BLW is changed at the outside air temperature. However, the blower voltage BLW may be changed by combining the outside air temperature and the amount of solar radiation. Further, the blower voltage BLW may be changed according to the set temperature or the inside air temperature.
In the first embodiment, the deviation between the inside air temperature and the set temperature is used as means for determining whether or not the cooling load in the passenger compartment is greater than a predetermined value. However, whether or not the inside air temperature is equal to or higher than the predetermined temperature. May be determined.
[0062]
In addition, the present invention can be applied to a device that performs non-linear control such as neuro-control and fuzzy using, for example, the inside air temperature, the set temperature, the outside air temperature, and the amount of solar radiation as input variables.
[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 showing a control configuration of the vehicle air conditioner in the first embodiment.
FIG. 3 is a flowchart showing control contents in the first embodiment.
FIG. 4 is a characteristic diagram showing a relationship between TAO and a blower voltage BLW in the first embodiment.
FIG. 5 is a characteristic diagram showing the relationship between TAO and outlet mode in the first embodiment.
FIG. 6 is a flowchart showing the control content of the main part in the first embodiment.
FIG. 7 is a characteristic diagram showing the determination content of the cooling load in the first embodiment.
FIG. 8 is a characteristic diagram showing the relationship between the blower voltage BLW and the inside / outside air mode in the first embodiment.
FIG. 9 is a characteristic diagram showing details of determination of cooling load in the second embodiment.
FIG. 10 is a characteristic diagram showing the determination content of the cooling load in the third embodiment.
FIG. 11 is a characteristic diagram showing the determination content of the cooling load in the fourth embodiment.
FIG. 12 shows a blower voltage BLW and an inside / outside air mode blower voltage BLW in the fifth embodiment.₀It is a characteristic view which shows the relationship.
FIG. 13 is a characteristic diagram showing a relationship between a temperature deviation (Tset−Tr) and a blower voltage BLW in the sixth embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Air conditioning case, 5 ... Fan, 26 ... Air conditioning control apparatus, 27 ... Inside air temperature sensor,
28 ... Outside air temperature sensor, 29 ... Solar radiation sensor, 32a ... Temperature setting device.

Claims (9)

An air conditioning case (1) forming an air flow path;
A blower (5) for blowing conditioned air toward the passenger compartment in the air conditioning case (1);
Air flow rate control means (S140) that determines and controls the air flow rate (BLW) of the blower (5) based on air conditioning environment information (Tset, Tr, Tam, Ts, Tw, Te) that affects the air conditioning environment in the passenger compartment. )When,
Inside air mode for introducing only vehicle interior air into the air conditioning case (1), outside air mode for introducing only vehicle interior air into the air conditioning case (1), vehicle interior air within the air conditioning case (1) An inside / outside air switching door (4) for switching between a semi-inside air mode for introducing both outside air from the passenger compartment,
Determination means (S151) for determining whether or not the cooling load in the passenger compartment is greater than a predetermined value;
An outside air mode determining means (S153) for determining the outside air mode when the determining means (S151) determines that the cooling load is smaller than the predetermined value;
Inside / outside air mode determining means (S152) for determining the inside / outside air mode by the inside / outside air switching door (4) based on the determination result of the determining means (S151) and the air flow rate (BLW),
The inside / outside air mode determination means (S152) is determined when the cooling means is determined to be greater than the predetermined value by the determination means (S151) and the air flow rate (BLW) is greater than the predetermined air flow rate (BLW1). Determine the shy mode,
When the determination means (S151) determines that the cooling load is greater than the predetermined value and the air flow rate (BLW) is smaller than the predetermined air flow rate (BLW1), the semi-inside air mode is determined ,
The air conditioning environment information includes means for calculating at least a value related to a deviation between a passenger compartment temperature ( Tr ) and a passenger compartment set temperature ( Tset ),
The air flow control means (S140) includes at least one piece of information ( Tam ) among a value related to a deviation between the passenger compartment temperature ( Tr ) and a preset temperature ( Tset ) of the passenger compartment, and the air conditioning environment information. The air volume (BLW) is determined based on
Even if the value related to the deviation is the same due to the change in the information ( Tam ), the air flow rate (BLW) is set to a different value . The value related to the deviation between the passenger compartment temperature (Tr) and the set temperature (Tset) in the passenger compartment is a deviation between the passenger compartment temperature (Tr) and the preset temperature (Tset) in the passenger compartment. Item 2. A vehicle air conditioner according to Item 1 . Air-conditioning air in which a value related to a deviation between the vehicle interior temperature (Tr) and the vehicle interior set temperature (Tset) is calculated based on at least the vehicle interior temperature (Tr) and the vehicle interior set temperature (Tset). vehicular air conditioning apparatus according to claim 1, characterized in that the target air temperature (TAO). In the state where the cooling load is larger than the predetermined value, the air flow control means (S140) increases the air flow (BLW) as the target air temperature (TAO) decreases,
The information is a temperature outside the passenger compartment (Tam), and even if the target outlet temperature (TAO) is the same, the lower the temperature outside the passenger compartment (Tam), the larger the air volume (BLW). The vehicle air conditioner according to claim 3 . The said determination means (S151) determines the said cooling load based on the deviation of the said vehicle interior temperature (Tr) and the said preset temperature (Tset), The one of Claims 1 thru | or 4 characterized by the above-mentioned. The vehicle air conditioner described in 1. The vehicle air conditioner according to claim 3 or 4, wherein the determination means (S151) determines the cooling load based on the target outlet temperature (TAO). The vehicle air conditioner according to any one of claims 1 to 4 , wherein the determination unit (S151) determines the cooling load based on an outside temperature (Tam). The said determination means (S151) determines the said cooling load based on the vehicle interior temperature (Tam) and the solar radiation amount (Ts) to the vehicle interior, The one of Claim 1 thru | or 4 characterized by the above-mentioned. The vehicle air conditioner described in 1. In the semi-inside air mode, the ratio between the amount of air introduced into the air-conditioning case (1) and the amount of air introduced into the air-conditioning case (1) is linearly controlled. And
Wherein in the semi-internal air mode, a vehicle according to any one of claims 1 to 8, characterized in that the ratio of the vehicle outside air introduction amount with a decrease in the blast volume (BLW) gradually increases Air conditioner.

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