JPS62286819A - Air conditioning device for automobile - Google Patents

Abstract

PURPOSE:To reduce the generation of noise during maximum cooling, to decrease a consumption power, and to uniformize a blow off temperature, by a method wherein, separately from a heater core bypass passage, a draft passage, through which a vaporizer and an upper supply opening are intercommunicated, and an opening and closing means for the bypass passage are provided. CONSTITUTION:During maximum cooling, a heater bypass door 6 is opened, and a heater core 4 is closed by means of an air mix door 8. A vent supply opening 1c is communicated to an upper blow off duct 1b through a vent diff door 9 and a diff bypass door 10. A floor supply opening 1e is closed by means of a floor door 11. Thus, cold air passing a vaporizer 3 is all blown off in a car room through an upper supply opening 1b. This constitution prevents production of discontinuous sensation of control of an airflow, enables reduction of draft resistance, reduction of the generation of noise, reduction of a consumption power, and uniformization of a blow off temperature.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an air conditioner for automobiles, and in particular, to high air volume and low noise, in which the upper and lower blowout temperatures can be independently controlled by WA%1. The present invention relates to a suitable air conditioner for automobiles.

[Conventional technology]

As disclosed in Japanese Utility Model Application Publication No. 55-85914, an air conditioner for cooling and heating the interior of an automobile is conventionally used to divide the flow of the evaporator in the case of the air conditioner into upper and lower parts by a partition wall, and to blow out the upper and lower parts. The temperature is independent, m? I! It is known what made it possible. However, this proposal did not consider reducing ventilation resistance in order to increase air volume and reduce noise.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology does not take into account the reduction of ventilation resistance during maximum cooling, and suffers from high noise and high power consumption of the blower motor.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an air conditioner for an automobile that can reduce noise during maximum cooling, reduce power consumption, and provide a uniform air outlet temperature.

[Means for solving problems]

In order to achieve the above object, the present invention provides a ventilation passage that communicates the cooling evaporator with the upper air outlet, in addition to the passage that bypasses the heater core, and provides an opening/closing means for this ventilation passage. .

[Effect]

According to the above configuration, during maximum cooling, the ventilation passage connecting the evaporator and the upper outlet is opened and cold air is discharged directly to the upper outlet, thereby greatly reducing ventilation resistance and reducing noise. Power consumption of the blower motor can be reduced. Further, since it is not necessary to take into consideration the increase in ventilation resistance of the heater core downstream of the door due to the increase in air volume, it is possible to make the blowing air uniform.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the air conditioning bag ff1 for a vehicle (hereinafter simply referred to as an air conditioner) according to the present invention will be described with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1, 2, and 3.
In the figure, inside a duct casing 1 that houses each component of an air conditioner, there are a blower motor 2. An evaporator 3 that is a heat exchanger for the air conditioner and a heater core 4 that is a heat exchanger for the heater are provided. An inside/outside air switching door 5 is provided on the inlet side of the duct casing 1 where the blower motor 2 is provided, for selectively introducing outside air or inside air into the air conditioner, and on the downstream side of the evaporator 3, cold air is introduced. A heater bypass door 6 is provided for direct communication with the upper air outlet 1a. At the front of the evaporator 3, an upper air mix door 7 for controlling the temperature of the upper air outlet and a lower air mix door 8 for controlling the temperature of the lower air outlet are provided with a partition wall 1g in between. The duct casing 1 on the rear side of the evaporator 3 includes:
A differential air outlet 1d and a floor air outlet 1e are formed,
A vent differential switching door 9 is provided at the differential air outlet 1d, and a floor door 11 is provided at the floor air outlet 1e. A differential bypass door 10 is provided at the rear of the heater core 4 to partition the differential air outlet 1d and the floor air outlet 1e. The operation combination of these doors 5 to 11 determines the upper and lower blowout @tones and the blowout mode. Further, 1a is a heater bypass outlet that is opened and closed by a heater bypass door 6, and is connected to the upper outlet duct 1b.

1f is a partition wall that partitions the upper and lower cold air bypass passages and the heater bypass passage. FIG. 3 is a diagram in which the upper blow-off duct lb is connected to the heater unit shown in FIG. 2, and the heater bypass blow-off port 1a and the vent blow-off port 1c are open.

Next, the means for controlling each of the above-mentioned devices and doors will be explained. 12 is an actuator that controls the inside/outside air switching door 5; 13 is a cam link device for interlocking the upper air mix door 7 and the heater bypass door 6; 14 is an actuator that operates this cam link device 13; 15 is a lower air an actuator for operating the mix door 8, 16.
is the vent differential switching door9. A cam link device for interlockingly controlling the differential bypass door 10 and the floor door 11; 17 is an actuator for operating the cam link device 16; 18
19 is a power transistor forming part of a device for controlling the rotational speed of the blower motor 2, and 19 is a compressor that is a component of the refrigeration cycle. 20 is a control device, which is composed of a microcomputer, an A/D converter, and other interfaces. 21 is an outside air sensor, 22 is an in-vehicle sensor, 23 is a floor duct sensor, 24 is a vent duct sensor, and 25 is a differential duct sensor, which detects the temperature at each location and inputs it to the control bag ff20.

26 is a position sensor of the actuator 12 of the inside/outside air switching door 5, 27 is a position sensor of the actuator 14 of the upper air mix door 7, 28 is a position sensor of the actuator 15 of the lower air mix door 8, and 29 is a link device fi!
This is a position sensor for the 7-cut unit 17 of f16. Further, 30 is a temperature measuring device, and 31 is a manual mode setting device.

Next, the operating positions and work flows of each door in each mode of the air conditioner according to this embodiment configured as described above will be explained with reference to FIGS. 4 to 8.

FIG. 4 shows maximum cooling, when the heater bypass door 6 is opened and the air mix door 7.8 is operated to close the heater core 4. FIG. Then, the vent differential door 9 and the differential bypass door 10 are operated so that the vent outlet 1c communicates with the upper outlet duct 1b, and the floor door 11 is operated to close the floor outlet 1e, so that all the cold air that has passed through the evaporator 3 is It is discharged into the vehicle through the upper outlet duct 1b. To increase the cooling effect when using i&large air conditioner.

Since it is necessary to completely circulate the inside air, the inside/outside air switching door 5 is operated to close off outside air.

FIG. 5 shows the vent mode, which is an upper temperature control blow-out mode, and the ratio of inside and outside air introduction commensurate with the required cooling capacity is determined by the opening degree of the inside and outside air switching door 5. Thereafter, the introduced air is dehumidified and cooled by the evaporator 3 and guided to the upper and lower temperature control passages. The cold air divided into upper and lower parts is sent through the air mix door 7.8.
After changing the ratio of the cold air that bypasses the heater core 4 and the warm air that passes through the heater core 4 and reheats it, the temperature of the air blown out from the vent outlet 1c is controlled by mixing the warm air and the cold air. In this temperature control mode, door 6.9, 10
．． 11 is closed.

Figure 6 shows the pie level mode in which the temperature of the air blown out from the upper vent outlet 1c and the lower floor outlet 1e is adjusted independently to create a comfortable air-conditioning condition in which one horse is cold and warm. The switching door 5 closes the inside air side so as to introduce all the outside air. The upper and lower blowout levels are adjusted independently by the air mix doors 7.8, and the air is blown out from the vent outlet 1c and the floor outlet 1e.

At this time, doors 6,9,10 are closed and door 11 is open.

FIG. 7 shows the heater mode, which is different from the pie level mode shown in FIG. 6 in that the upper vent outlet 1c is closed and the differential outlet 1d is open. Since the heater mode is used when the outside air temperature is lower than the pie level mode, the upper and lower blowing temperatures are higher. On the other hand, blowing hot air of approximately 35°C or higher from the vent outlet 1c will make your face uncomfortable, so the temperature is detected and controlled by the differential duct sensor installed at the differential outlet 1d. We also do prevention. At this time, doors 6 and 10 are closed and door 11 is open.

Figure 8 shows the differential mode; in this case, the windows are fogged,
This mode is used in emergencies such as melting ice, and the inside/outside air switching door 5 is located on the side where all the outside air is introduced, and after the introduced outside air is dehumidified and cooled by the evaporator 3, it all passes through the heater core 4 and is sent to the differential air outlet 1d. It blows out. In this case, the temperature may be adjusted by the air mix door 7.8 after the fog clears. At this time, doors 6 and 11 are closed and door 10 is open.

Next, this example! The I control method will be explained. Mode setting device 3
1, when the mode is set and the air conditioner is operated, the set temperature Ts is corrected by a signal based on the outside air temperature Ta detected by the outside air sensor 21, and inputted into the control table [20 as the target set room temperature Tso. Ru. The set temperature Ts is corrected in relation to the outside air temperature Ta, and the outside air temperature T
The target set room temperature Tso is calculated so that the once set temperature feeling can be maintained even if a changes. Next, in-car sensor 2
Based on the signals of the room temperature Tr detected by the controller 2, the target setting room 'eITso, and the outside air temperature Ta detected by the outside air sensor 21, the control device 20 determines the blower speed, required suction temperature, blowing mode, internal/external air introduction ratio, and the compressor 1.
The actuator 12 is operated by calculating the operation or non-operation of the
, 14, 15, 17° The power transistor 18 and the compressor 19 are controlled to create a comfortable air conditioning condition.

Next, the operation when shifting from the maximum cooling state to the temperature control state, which is the main focus of this embodiment, will be explained with reference to FIG. 9. In the figure, if the operating state of the heater bypass door 6 and the upper air mix door 7 is plotted on the vertical axis, and the control range of the operating angle of the actuator 14 is plotted on the horizontal axis, after the cold air bypass amount is controlled by the heater bypass door 6, Air mix door 7
is activated, there is no sense of discontinuity in air volume control, the ventilation resistance at maximum cooling can be reduced, and air mix performance can be improved without considering an increase in ventilation resistance.

According to this embodiment, since the ventilation resistance during cooling can be reduced, noise can be reduced, and the amount of power consumed by the blower motor 2 can also be reduced.

Furthermore, since the air mix during temperature adjustment can be improved, comfortable air conditioning with uniform outlet temperature can be achieved.

〔Effect of the invention〕

As described above, according to the present invention, a cooling-only cold air passage provided separately from the heater bypass cold air passage is communicated with the upper air outlet, an opening/closing means is provided for opening and closing this communication passage, and the communication passage is closed at maximum cooling. Since the opening is opened to discharge cold air directly to the upper air outlet, it is possible to reduce ventilation resistance, reduce noise, and obtain a uniform blowing temperature.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of an automotive air conditioner according to the present invention, FIG. 2 is a perspective view showing the heater unit part of FIG. 1, and FIG. FIG. 4 to FIG. 8 are schematic diagrams showing the air flow of this embodiment, and FIG. 9 is a graph showing the operation of the heater bypass door of this embodiment. 1...Casing, 1a...Upper outlet, 1b...
・Upper outlet duct, 1c...Vent outlet, 1d...
・Differential air outlet 0.1g...Floor outlet, if, 1g
... Partition wall, 3... Evaporator, 4... Heater core,
6... Heater bypass door, 13... Cam link device.

Claims (2)

[Claims] 1. The ventilation passage downstream of the evaporator for cooling the air flowing inside the casing is divided into a plurality of parts, a heater core is provided in each passage to heat the air, and the air in each passage is distributed inside the vehicle. In an automobile air conditioner configured to send air to different air outlets,
An air conditioner for an automobile, comprising a ventilation passage that communicates the evaporator with an upper air outlet, and an opening/closing means for opening and closing the ventilation passage, in addition to the ventilation passage that bypasses the heater core. 2. In the air conditioner for an automobile according to claim 1, the opening/closing means for opening and closing the ventilation passage that communicates with the evaporator and the upper outlet is interlocked with a door that opens and closes the inlet communicating with the upper outlet of the heater core. An air conditioner for an automobile, characterized in that the door is opened and closed by a cam link device.