JPH0649114U - Vehicle air conditioner - Google Patents

Abstract

(57) [Abstract] [Purpose] Improper blowout mode that can occur when automatically operating an air conditioner with a limited number of inside air sensors in a vehicle with a large living space such as a bus and a non-uniform cabin temperature. To prevent the selection of a passenger and to create a comfortable atmosphere for all passengers. [Structure] A control device attached to a vehicle air conditioner first provisionally selects a blowout mode according to a vehicle interior temperature detected by an inside air sensor. Since the temporarily selected blow mode is governed by the condition of the installation position of the inside air sensor, the temporarily selected blow mode may not be appropriate. Therefore, in the present invention,
Paying attention to the fact that the outside air temperature does not fluctuate as much as the vehicle interior temperature, the previously selected blowout mode is evaluated in light of the preset criteria corresponding to the outside air temperature, and inappropriate blowout is performed. When the mode is selected, its execution is prohibited so that the mode can be changed to a more appropriate blowing mode in view of the outside air temperature.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle air conditioner (automatic air conditioner) having an automatic control function for use in a vehicle having a large living space such as a bus.

[0002]

[Prior art]

 In recent years, so-called auto air conditioners have come to be generally used in vehicles such as passenger cars having a relatively small living space (cabin). The automatic air conditioner does not require any manual adjustment, and the blowing mode is switched and the air volume or the blowing temperature is adjusted so that a comfortable atmosphere can always be obtained according to the temperature inside the vehicle or the outside temperature. Adjustments are made automatically. For this reason, so-called automatic air conditioners are equipped with an outside air sensor that is generally attached to the front of the vehicle to detect the temperature of the outside air, in addition to the inside air sensor that detects the temperature inside the vehicle. Based on the sum of the detected values, the electronic control unit automatically determines the blowing mode, blowing temperature, air volume, etc. of the automatic air conditioner.

[0003]

[Problems to be solved by the device]

 In the case of a vehicle with a relatively small living space (cabin) such as a passenger car, a large temperature difference does not occur locally in the cabin, so even if only one inside air sensor is used, the average temperature will be sufficiently accurate. It can detect various vehicle interior temperatures, and can properly control the auto air conditioner by the sum of the detected value and the detected value of the outside air sensor. However, it is an air conditioner for vehicles with large living spaces such as buses. In the case of automatic control of the inside air temperature, if the inside air sensor is installed in some specific place, the detected value of the inside air sensor is If the entire air conditioner is automatically controlled based on the detected value, which is greatly affected by the special conditions of the specific installation position, it will be comfortable for the majority of passengers in seats at other positions. Atmosphere Formation is likely to be impossible to. However, inside air sensors are installed near all seats, for example, to accurately detect the average passenger compartment temperature, or the number of air conditioner outlets is increased to make the passenger compartment temperature and wind speed constant. It is impossible in reality to do so.

Further, even when a small number of inside air sensors are provided, there are many restrictions on the installation position because the vehicle is a vehicle. If automatic control of the entire air-conditioning system is performed by the detection values of a small number of inside air sensors installed in such a specific position, the above-mentioned problems will occur. The detected value fluctuates even when one of the people approaches or moves away, so if the air conditioner's blowout mode, temperature, air volume, etc. change abruptly and frequently, the control will be stable. As a matter of course, the comfort of the entire occupant cannot be secured. Furthermore, even if the vehicle interior temperature is the same, there is also the problem that the so-called sensible temperature felt by people varies depending on the season, wind speed, etc.Therefore, depending on the automatic control of the air conditioner using only the detected values of a few inside air sensors, It is difficult to keep the passenger compartment comfortable at all times.

Therefore, the present invention solves the above-mentioned problems that may occur when automatically controlling an air conditioner in a vehicle having a large living space such as a bus, and increases the number of inside air sensors and air outlets. , The installation position is not greatly restricted, and the temperature inside the passenger compartment is not abruptly changed by the simplest possible means, and a comfortable atmosphere for the majority of passengers is always stable. The problem to be solved by the invention is to obtain an automatic control type vehicle air conditioner that does not require such troublesome manual adjustment.

[0006]

[Means for Solving the Problems]

 As a means for solving the above problems, the present invention provides at least a ceiling blowing mode, a foot blowing mode, and a bi-level mode that uses both of them by being automatically controlled by an attached control device. And a means for the control device to temporarily select one of the blowout modes in accordance with the temperature inside the vehicle compartment. And a means for prohibiting an inappropriate blowout mode by evaluating the temporarily selected blowout mode according to the outside air temperature, and a vehicle air conditioner for use in a vehicle with a large living space. provide.

[0007]

[Action]

 When the vehicle air conditioner according to the present invention is automatically controlled and operated, the control device temporarily selects the blowout mode to be taken from the ceiling blowout mode, the foot blowout mode, and the bi-level mode depending on the vehicle interior temperature. To do. Since the temporarily selected blowout mode is governed by the condition of the installation position of the inside air sensor that detects the vehicle interior temperature, the blowout mode may not be appropriate. Therefore, in the present invention, focusing on the fact that the outside air temperature detected by the outside air sensor does not fluctuate as much as the vehicle interior temperature, the tentatively selected blowout mode is selected in accordance with the preset standard corresponding to the outside air temperature. If an inappropriate blowout mode is selected, its execution is prohibited so that the blowout mode can be changed to a more appropriate blowout mode from the outside air temperature.

[0008]

【Example】

 As an embodiment of the present invention, a layout of an air conditioner in a vehicle body 1 of a bus is shown in FIGS. 3 and 4, and a detailed structure of a ceiling portion is shown in FIG. Since the present invention does not have a feature in the basic structure of the air conditioner, a detailed description thereof will be omitted, but the air conditioner unit 2 is housed in the ceiling portion of the front part of the body 1 of the bus in the embodiment. The refrigerant circulating in the refrigeration circuit of the air conditioner unit 2 is compressed by a compressor provided near an engine (not shown), radiated to the outside air by the condensing unit 3 under the floor, and condensed and liquefied. In the ceiling air conditioner unit 2, it expands in the evaporator 4 through a throttle like an expansion valve, cools the air passing through the evaporator 4, and supplies the cooled air to the passenger compartment. The air in the passenger compartment 5 flows out of the passenger compartment 5 into the space 8 in the ceiling when the inside air damper 7 that opens and closes the air inlet duct 6 is open, and passes through the evaporator 4 by the blower 9 driven by the motor. It is pumped to do. An outside air damper 11 is provided following the front opening 10 of the ceiling space 8, and when the outside air damper 11 is opened, the outside air is taken in and is sent from the blower 9 to the evaporator 4 together with the inside air.

The air conditioner unit 2 in this case is not a simple cooler (cooling device), but a flowing water type reheat core 12 as a heat exchanger is provided on the downstream side of the air flow of the evaporator 4 as shown in FIG. The reheat core 12 is connected to a pipe of hot water (high-temperature engine cooling water) not shown, and the hot water is reheated when a control valve such as a solenoid valve capable of adjusting the flow rate inserted into the pipe is opened. The air that has been allowed to flow into 12 and has been dewatered by the evaporator 4 to have its moisture removed is heated again, so that the passing air can be dehumidified. Needless to say, when hot water is circulated through the reheat core 12 when the compressor is stopped and the refrigerant is not circulating, the air conditioner unit 2 operates as a heater (heating device).

The air in the passenger compartment is sucked into the space 8 in the ceiling from the air inlet duct 6 when the inside air damper 7 is open, and the outside air taken in from the front opening 10 when the outside air damper 11 is open. After being mixed with the air, the blower 9 sucks the air into the air conditioner unit 2 in the ceiling to cool it, or dehumidifies or heats it to adjust the temperature and humidity. Will be diverted from a large number of ceiling outlets 14 that open above each seat to blow out into the passenger compartment. The rotation speed of the motor that drives the blower 9 can be adjusted in multiple steps by the control device, and the amount of air blown from the ceiling outlet 14 can be adjusted accordingly. Further, the flow rate of the hot water flowing through the reheat core 12 can be changed in multiple stages by adjusting the opening degree of the control valve inserted in the passage according to the signal of the control device, so that the temperature of the air blown out from the ceiling outlet 14 can be changed. Can be adjusted freely.

Further, apart from the air conditioner unit 2 provided on the ceiling of the body 1 of the bus, a rear heater 15 for heating most of the rear part of the vehicle compartment is provided at the bottom of the body 1 of the bus. . In the example shown in FIG. 3 and FIG. 4, the rear heater 15 is housed inside the floor portion in front of the body 1 of the bus, and then extends rearward along the floor toward the rear heater duct. It is connected to 16. Although not shown in detail, the rear heater 15 has an opening (suction port) for sucking air from the passenger compartment, a blower with a motor for sucking and blowing air, and a heat exchanger for circulating hot water (engine cooling water). It has a heater core and a solenoid valve that opens and closes the hot water flow path. Further, the duct 16 for the rear heater 15 is also provided with as many outlets 17 as possible so that the warm air can be blown toward the feet of the occupant.

Therefore, whether or not hot water is flown to the rear heater 15 is selected by opening and closing the solenoid valve according to the signal of the control device, and the rotation speed of the motor for driving the blower is changed by the control device to change the duct 16. By adjusting the amount of air blown to the passengers, it is possible to adjust the amount and temperature of the warm air blown out from the outlets 17 at the feet of most passengers.

Further, a front heater 18 is provided near the instrument panel at the front end of the body 1 of the bus, mainly for heating around the driver's seat and taking in outside air. The front heater 18 is also a heater unit 19 as a heat exchanger that heats the air passing through by circulating hot water (engine cooling water), and can adjust the rotation speed connected to it by a duct. It is equipped with a blower unit 20 with a motor, an outside air intake 21 for sucking outside air in addition to the air in the passenger compartment to its inlet, and several outlets as terminal openings of the duct. The outlet from the front heater 18 is a center register or side register that can blow air toward the driver's face, or a front window that can blow air upward along the inside of the windshield. There are relatively upper outlets such as frosters and side defrosters, and relatively lower outlets that blow air toward the driver's feet.

The air from each of the upper (conveniently referred to as the ceiling side) and lower (referred to as the foot) outlets near the driver's seat can be individually blown or stopped by opening and closing the damper by the control device. When the outside air is mixed with the blown air, the mixing ratio of the outside air can be adjusted stepwise. For that purpose several dampers driven by an actuator such as a solenoid are provided in the middle of the duct. The air volume of the front heater 18 blown out from the outlets on the side of the mound and the feet can be adjusted by changing the rotation speed of the motor of the blower unit 20 by the control device, and the temperature of the warm air is fed to the heater unit 19. The flow rate of the hot water (engine cooling water) to be supplied can be adjusted by changing it by a solenoid valve which is also operated by the control device.

As described above, in the vehicle body 1 of the illustrated embodiment, the air conditioning unit 2 having the ceiling outlets 14, the rear heater 15 having the outlets 17 at the feet, the ceiling side and the feet side are provided. There are three types of air-conditioning units called front heaters 18 that are equipped with air outlets, but when these are in the automatic control state, the air conditioner unit 2 and the rear heater 15 are air intake ports to the air conditioner unit 2. The front heater 18 is automatically controlled by an electronic control device that issues a control signal according to the temperature detected by a rear inside air sensor 22 attached to a part of the ceiling surface near a certain air inlet duct 6 or the like. In accordance with the temperature detected by the front air sensor 23 provided in the vicinity of the air intake port, the electronic control device automatically However, in the present invention, during these automatic controls, the blowing mode of each air conditioner unit is limited by the outside air temperature detected by the outside air sensor 24 mounted outside the vehicle body 1 of the bus. The feature is that the control of is added. The parts corresponding to the features of the present invention will be described in more detail below.

FIG. 1 shows a basic control procedure in the vehicle air conditioner of the present invention. The following control is executed by, for example, an electronic control device housed inside an instrument panel in a driver's seat. To be done. Needless to say, all three air conditioning units can be operated manually and freely, but if "auto" is selected on the instrument panel for automatic control operation, the rear air sensor 22 According to the temperature detected by and the magnitude of the deviation YR between the detected temperature and the preset temperature, the blowout mode of which blowout outlet is to be used and at what ratio is temporarily selected, and the temperature deviation YR is determined. The air volume and the temperature of the air to be blown out from the ceiling outlet 14 and the foot outlet 17 at the bottom so as to be zero are also calculated.

The rear side blowing mode includes a ceiling blowing mode (Face) in which air whose temperature, humidity and air volume are adjusted by the air conditioner unit 2 is blown out only from the ceiling outlet 14, and an air whose temperature and air volume are adjusted by the rear heater 15. The foot blowing mode (Foot) that blows out air from only the foot outlet 17 at the foot, and the so-called by-air that blows out the air adjusted to an appropriate temperature / humidity and air volume from both the ceiling air outlet 14 and the foot outlet 17 at the same time. It can be classified into three modes of level mode (Bi-level, abbreviated as B / L). These blowout modes, which are temporarily selected for the above, further read the outside air temperature detected by the outside air sensor 24 into the control device, and an example is shown in FIG. When the temporarily selected blow mode corresponds to the blow mode marked with a circle in the table of Fig. 2 by collating with the table as shown in Fig. 2, execution of the blow mode is permitted, and the air conditioner is controlled by the controller. The air volume and temperature of the air blown out from each of the unit 2 and the rear heater 15 are determined.

If the tentatively selected blowing mode does not match the table of FIG. 2, the execution of the blowing mode is prohibited, but the tentatively selected blowing mode and the table of FIG. In the case where there is no common part with the allowable blowout mode in the above, and the two are completely incompatible, as one embodiment, the blowout mode marked with a circle in the table of FIG. 2 is preferentially selected. Accordingly, the temperature and the air volume of the air blown from the air conditioner unit 2 and the rear heater 15 are corrected accordingly.

The control peculiar to the air conditioner of the present invention as described above is, in short, completely automatically controlled by the detection value of one rear inside air sensor 22 provided at a specific position. When determining all of the temperature and the air volume, there is a concern that a special condition of the position where the rear inside air sensor 22 is installed becomes dominant, and sometimes it may not be possible to create a comfortable state for the entire occupant. Therefore, the abnormal control result is corrected by comparing the outside air temperature detected by the outside air sensor 24 so as to draw a proper conclusion.

The table of FIG. 2 will be described in more detail. The numbers 1 to 7 shown as the outside air temperature in this table are indicators used instead of the actual temperature from low temperature to high temperature. It does not mean that temperatures are evenly spaced. In the figure, the arrow at the left end of the horizontal line indicating the outside air temperature region is directed downward, and the deviation YR between the detected temperature of the rear inside air sensor 22 and the set temperature shows a positive value, and the air conditioner unit 2 and the rear heater are shown. The types of blowout modes that can be permitted when 15 is in an operating state in which the vehicle interior temperature is lowered by automatic control are indicated by a circle, and the types of blowout modes that are not permitted (prohibited) are indicated by a cross. Shows. Similarly, the arrow points upward when the air-conditioning unit 2 and the rear heater 15 are in an operating state in which the temperature inside the passenger compartment rises because the temperature deviation Y R shows a negative value. Therefore, the allowable blowing mode and the prohibited blowing mode at that time are indicated by ○ and ×, respectively.

Specifically, first, in a state where the outside air temperature is very high such as 6 to 7 or more, when the temperature deviation YR has a positive value and the vehicle should be operated in the direction of decreasing the vehicle interior temperature, the table of FIG. Since the mode indicated by is A stage, only the ceiling blowing mode is allowed in this case, and the foot blowing mode and the bi-level mode are prohibited modes. When the blowout mode is determined in this way, the airflow rate and temperature of the air blown out from the air conditioner unit 2 are determined in the subsequent control procedure, and the compressor is connected to the engine by an electromagnetic clutch or the like and driven accordingly. At the same time as the refrigerant starts circulating, the motor of the blower 9 rotates at the speed designated by the control device. Further, in this case, since the detection values of not only the outside air sensor 24 but also the inside air sensor 22 are high, the air conditioner unit 2 operates as a cooler only in the ceiling blowing mode, and the hot water for the reheat core 12 and the rear heater 15 (engine The supply of cooling water) will be shut off by closing the valves provided in the respective flow paths. Therefore, the rear heater 15 does not operate at all.

In a state where the outside air temperature is in a relatively high range such as 5 to 7, the temperature deviation YR has a negative value, and the air conditioner unit 2 and the rear heater 15 are automatically controlled to increase the vehicle interior temperature. When it operates, it corresponds to the B stage in the table of FIG. 2, so when the blowout mode provisionally selected by the detection value of the rear inside air sensor 22 is either the ceiling blowout mode or the bi-level mode, Execution of the blowing mode is permitted, and if the foot blowing mode is provisionally selected, execution is prohibited. If the blowout mode previously selected and the blowout mode allowed in the table in FIG. 2 do not match as in this case, for example, the blowout mode marked with a circle in the table in FIG. 2 is temporarily selected. The one closer to the specified blowout mode is preferentially executed, but it is appropriate to make a preset setting so as to correct the air volume and temperature of the air blown out from each air conditioning unit.

As can be seen from the table of FIG. 2, in the allowable mode and the prohibit mode in the same B stage, the temperature deviation YR takes a positive value when the outside air temperature is in the range of 6 to 4, and thus the air conditioner unit It also applies when 2 operates in the direction of lowering the passenger compartment temperature.

In these cases (stage B), since the foot blowing mode is the prohibit mode, it is impossible to blow air only from the foot outlet 17 at the foot of the rear heater 15, but the bilevel mode is If it has been tentatively selected, it is also the B-stage permissible mode, so the bilevel mode is executed, and, for example, from the ceiling outlet 14 of the air conditioner unit 2 and the outlet 17 at the foot of the rear heater 15, A small amount of air is blown out. However, in these cases, since the temperature of the vehicle interior as well as the temperature of the outside air is high, the air blown out from the air outlet 17 at the feet becomes a relatively low temperature with almost no heating, and at the same time the compressor of the air conditioner unit 2 is driven. The relatively low temperature air is blown out from the ceiling outlet 14.

From the same point of view, in the C stage in the table of FIG. 2, when the foot blowing mode or the bay level mode is allowed and the ceiling blowing mode is prohibited, the outside air temperature is in the range of 4 to 2. It is applied when lowering the passenger compartment temperature in the state of 1) and when raising the passenger compartment temperature when the outside air temperature is in the range of 3 to 5, and one of the bi-level mode and the foot blowing mode is provisionally selected. If it is, the rear heater 15 only in the foot blowing mode, and both the air conditioner unit 2 and the rear heater 15 in the bi-level mode at the same time, the air volume and temperature of the optimum air temperature and temperature suitable for the condition at that time are met. Will be blown out.

Further, the D-stage of the table of FIG. 2 is a case where the temperature inside the vehicle is raised in a very low outside air temperature of 3 to 1 or less, and only the foot blowing mode is allowed. Blowout mode and bilevel mode are prohibited. Therefore, only the rear heater 15 is operated, the compressor of the air conditioner unit 2 and the blower 9 are stopped, and the supply of hot water to the reheat core 12 is also stopped. In this case, a relatively large amount of relatively high temperature air is blown out from the air outlet 17 at the feet to warm the occupant from the feet, but the air is never blown out from the ceiling side.

As is clear from the above description, in the case of the A stage in the table of FIG. 2, the vehicle interior temperature is high in accordance with the high outside air temperature, and only the ceiling blowout mode is allowed at that time. This means that the rear heater 15 inevitably stops the blowing of warm air from the foot outlet 17 at the feet, and the operation of the air conditioner unit 2 also drives the compressor to the reheat core 12. The hot water supply is stopped. On the other hand, in the case of the D stage, the outside air temperature is low and the passenger compartment temperature is also low. At that time, only the foot blow mode is allowed. Alternatively, it means that the blowing of warm air is completely stopped, the compressor and the blower 9 of the air conditioner unit 2 are stopped, and the supply of hot water to the reheat core 12 is also stopped.

However, both the B-stage and the C-stage in the table of FIG. 2 may allow the bi-level mode, and in these cases, the air conditioner unit 2 having both cooling and heating elements is provided. It is necessary to determine in advance how to operate in the ROM of the control device. Table 1 below shows the most appropriate operating specifications of the air conditioner unit 2. In Table 1, ○ indicates that operation is possible, and × indicates that operation is not possible.

That is, in the example of Table 1, the outside air temperature and the vehicle interior temperature are relatively high in the B-stage where either the bi-level mode or the ceiling blow-out mode is allowed, and therefore, it is close to the case of the A-stage described above. Since this is the state, the compressor of the air conditioner unit 2 is driven, while the hot water to the reheat core 12 is shut off, and the ceiling outlet 14 only blows cold air.

Further, in the C stage where either the foot blowing mode or the bi-level mode is allowed, the outside air temperature and the vehicle interior temperature are relatively low, and therefore, the state is close to the case of the D stage described above. Even when the bi-level mode is temporarily selected and allowed, the compressor of the air conditioner unit 2 is stopped, but hot water is supplied to the reheat core 12 and hot air is blown out from the ceiling outlet 14. become. Then, in either case, the blower 9 is operated.

[0031]

[Table 1]

Although the above description describes the control of the air conditioner unit 2 and the rear heater 15, which is the air conditioning control of the rear side portion of the passenger compartment of the bus, the same idea is used to control the air conditioning in the vicinity of the driver's seat in the front of the passenger compartment. It can be carried out. In this case, the control device tentatively selects the blowout mode of the front heater 18 based on the detection value of the front inside air sensor 23, and the air to be blown out according to the deviation YF between the detection value of the front inside air sensor 23 and the set value. Calculate the air volume and temperature.

Next, as shown in the lower part of FIG. 2, the outside air temperature detected by the outside air sensor 24 and the corresponding stage of the table as shown in FIG. 2 which is determined depending on whether the value of the deviation YF is positive or negative are examined, and If the tentatively selected blowout mode is allowed, the blowout mode is executed, and if the blowout mode is prohibited, the blowout mode closest to the tentatively selected mode among the blowout modes allowed in the table of FIG. Will be executed. The set value in this case may not be the same value, for example, a value obtained by uniformly adding 2 ° C to the set value on the rear side is adopted.

The flow chart shown in FIG. 6 collectively illustrates the control procedure described above. This example deals only with the air conditioning control on the rear side, but it goes without saying that the same method can be applied to the front side. The control program shown in such a flow chart is an electronic device (not shown) equipped with a microprocessor, which is well known in the past, when an air conditioner such as a bus is automatically operated and operated by automatic control. It is repeatedly executed at short intervals by the electronic control unit.

Next, the flowchart of FIG. 6 will be briefly described. When the program is started by turning on the automatic operation switch of the air conditioner, first in step 101, the detected value of the rear inside air sensor 22 and the set value of the passenger compartment temperature are read into the CPU, and the temperature deviation YR is calculated. At the same time, the table set in the ROM is collated based on these values to temporarily select the blowing mode, and the air volume and temperature of the air to be blown are also calculated. In the prior art, those calculation results are directly executed.

As a feature of the present invention, in step 102, the outside air temperature detected by the outside air sensor 24 is read into the CPU, and the temperature deviation YR and the blowout mode previously selected are stored in the ROM as shown in FIG. If it is possible to match the blowing mode with the table, it will be adopted, but if it is prohibited, a new blowing mode that is close to the tentatively selected blowing mode will be selected. To do. Thereby, the restricted blowing mode is adopted.

In step 103, it is determined whether the ceiling air volume is ON or OFF according to the blowing mode determined in the previous step. When the ceiling blowout mode or the bilevel mode is selected, the blower 9 of the air conditioner unit 2 is driven, so the ceiling air volume is ON regardless of whether it is the cooling operation or the heating operation. Therefore, the process proceeds to step 104. According to the determination in step 103, the ceiling air volume is OFF, that is, the air conditioner unit 2 is not in operation at all, so only the rear heater 15 operates, and the blowing mode is limited to the foot blowing mode. Execute the separately prepared foot mode program. Further, in step 106, the ceiling air volume is turned off to stop the motor of the blower 9.

On the other hand, when the ceiling airflow mode or the bi-level mode is selected as described above, when the ceiling airflow is ON and the routine proceeds to step 104, it is determined whether the foot airflow is ON or OFF. This is a determination as to whether the rear heater 15 is ON or OFF, in other words, whether the foot blowing mode or the bi-level mode is selected. If the air volume at the feet is ON, the routine proceeds to step 107, where a separately prepared bilevel mode program is executed. In the bi-level mode, generally, a small amount of air is blown out from both the ceiling outlet 14 and the foot outlet 17 at the foot, so in step 108, the foot air volume suitable for the condition at that time is calculated, and in step 109, the ceiling Determine the air volume as the minimum value (Lo).

When the air flow rate at the foot is OFF in the determination at step 104, it is limited to the ceiling blowing mode in which the rear heater 15 is not operated at all, so at step 110, the separately prepared foot blowing mode program is executed. In this case, since only the air conditioner unit 2 is operated, ceiling air volume control is performed in step 111. That is, the target rotation speed of the motor that drives the blower 9 is calculated, and in step 112, the foot air volume is OFF, that is, the motor that drives the blower of the rear heater 15 is turned off.

Since the above calculation results are temporarily stored in the RAM of the control device, the determined value of the ceiling air volume is output to the drive circuit in step 113 according to the results of steps 106, 109 and 112, and the output thereof is output. Stop the motor of the target blower 9 or rotate it at the specified rotation speed. Similarly, in step 114, the determined value of the air volume at the feet is output to the drive circuit, and the output causes the motor of the blower of the target rear heater 15 to stop or rotate at the designated rotation speed. These air volumes are displayed on the instrument panel in step 115 so that the driver can check them, and the process returns to step 101 again, and the calculation and control execution by the control device are repeated.

[0041]

[Effect of device]

 According to the present invention, even in a vehicle with a large living space such as a bus, it is possible to operate the air conditioner by automatic control without human intervention, and at that time, a sudden change in the vehicle interior temperature may occur. Instead, a comfortable atmosphere for the majority of passengers will always be obtained in a stable manner. Therefore, it is not necessary to increase the number of inside air sensors and air outlets, and there is no great restriction on their installation positions.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of a control procedure which is a feature of the present invention.

FIG. 2 is a table for limiting a blowing mode, which is a feature of the present invention.

FIG. 3 is a sectional view conceptually showing the structure of a vehicle body of a bus and an air conditioner.

FIG. 4 is a perspective view showing a structure of a vehicle body of a bus and an air conditioner.

FIG. 5 is a cross-sectional view showing a structure of an air conditioner housed in a ceiling portion of a bus.

FIG. 6 is a flowchart showing an example of control in the present invention.

[Explanation of symbols]

 1 ... Bus vehicle body 2 ... Air conditioner unit 4 ... Evaporator 9 ... Blower 12 ... Reheat core 14 ... Ceiling outlet 15 ... Rear heater 17 ... Foot outlet 18 ... Front heater 19 ... Heater unit 23 ... Front inside air sensor 24 ... Outside air sensor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Masahiko Ito 1-1, Showa-cho, Kariya city, Aichi Nihon Denso Co., Ltd. (72) Creator Kiichi Tabuchi 1-1-chome, Showa-cho, Kariya city, Aichi Nippondenso Incorporated (72) Inventor Yukishi Kato 1 Toyota-cho, Toyota-cho, Aichi Prefecture Toyota Automobile Co., Ltd. (72) Inventor Ritsufumi 1-cho, Toyota-cho, Aichi Pref. Toyota Motor Co., Ltd. (72) Inventor Kouji Yamamoto 25 Kamifujiike, Yoshihara-cho, Toyota-shi, Aichi Araco Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. An automatic control operation is performed by an attached control device to automatically select at least three types of blowing modes including a ceiling blowing mode, a foot blowing mode, and a bi-level mode using them together. The control device is configured to be capable of temporarily selecting one of the blowout modes according to the vehicle interior temperature, and the provisionally selected blowout mode is evaluated by the outside air temperature. A vehicle air conditioner for use in a vehicle with a large living space, characterized by comprising: