JPS6121819A - Car air-conditioner - Google Patents

Abstract

PURPOSE:To achieve ventilation without providing considerable number of additional parts to the conventional air-conditioning system by deciding whether ventilation is necessary then switching to the maximum inner air supply condition on the basis of the decision results and discharging the supplied inner air to the outside of cabin. CONSTITUTION:The cabin temperature Tc is compared with the room temperature Tc1 set for forceful ventilation to decide the operating condition of compressor if Tc>Tc1, and if it is controlled to operate the compressor, forceful ventilation is performed for the setting time T1 under full suction of inner air. It is performed by communicating the inner air take-in port 2 through an inner/outer air switching door 1 while bringing the ventilation door 31 to such position as to communicate the exhaust duct 33. Here, small gap 34 is made against the ventilation door 31 to perform cooling operation simultaneously with forced ventilation and in order to eliminate inconvenience in the refrigeration cycle, some amount of air is passed to an evaporator 5 to enable heatexchange. Consequently, ventilation can be realized by providing an exhaust duct 33 and a ventilation door 31.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an improvement in a duct ventilation system of an automobile air conditioner, a control method thereof, and a control device.

[Background of the invention]

Generally, if left outdoors for a long time during high temperatures such as summer,
Even if the temperature inside the vehicle becomes high and the air conditioner switch is turned on, the living room cannot be cooled for a while, and there are problems such as an unreasonable load being placed on the compressor. Therefore, as shown in Japanese Patent Application Laid-open No. 57-22909, for example, when the temperature inside the vehicle is higher than the outside air temperature or the set temperature, a method is known in which outside air is introduced for cooling and at the same time ventilation is performed using a second blower. It is being

This method requires the provision of an additional blower and blower unit in addition to the conventional air conditioning system, which not only increases the number of parts but also requires a long installation process.

[Purpose of the invention]

In view of the above points, an object of the present invention is to provide an air conditioner for an automobile that can perform good air conditioning by discharging the air inside the car to the outside of the car when ventilation is required without adding a large number of parts to the conventional air conditioning system. We are in the process of providing equipment.

[Summary of the invention]

The present invention determines whether ventilation is necessary, switches to the maximum inside air intake state based on the output, and exhausts the introduced inside air to the outside of the vehicle.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. 1, 2, and 3.

Controlled by the inside/outside air switching door 1, inside air intake 2'=! The air taken in by the blower 4 from the outside air intake port 3 or both of these is dehumidified and cooled by the evaporator 5, and heated by the air mix door 6 through the heater core 7 and the heater core 7.
The proportion of air that does not pass through is controlled, and the temperature-adjusted air is blown into the vehicle interior from the floor outlet 8, the vent outlet 9, the defroster outlet 10, or a plurality of these outlets. Switching control of each air outlet includes a floor door 11, a vent door 12, and a defrost door 1 corresponding to each air outlet.
It is done in 3.

On the other hand, an outside temperature sensor 14 detects the outside temperature, a room temperature sensor 15 detects the vehicle interior temperature, an intake temperature sensor 17 detects the intake temperature inside the air conditioning unit 16, and a water temperature sensor 17 detects the temperature of water flowing into the heater core 7. The signals from the sensor 18 and the opening sensor 19 that detects the opening of the air mix door 6 are input into the input interface 21 in the control unit 20, and the analog signals are converted into digital signals, and the signals are sent to the microcomputer 2.
Enter 2.

The microcomputer 22 performs calculations using a predetermined control program based on these digital signals and signals such as the user's mode designation from the controller/display 23, and outputs signals to each door via the output amplifier 24. Control actuators 25, 26, 27, 28, 29 and compressor magnetic clutch (not shown) blower 4
, the water cock 30, etc., to control the entire air conditioning system.

A flowchart showing the entire calculation process of the operation control program in the above configuration is shown in FIG.

It goes without saying that the order of each control calculation may be changed depending on the content of the calculation processing.

In this embodiment, as shown in FIG. 1, an exhaust duct 33 is provided between the blower 4 and the evaporator 50 to communicate with the outside of the vehicle, and a ventilation door 31 is provided that selectively opens and closes between the exhaust duct 33 and the blower 4 and the evaporator 5. make a profit.

Here, when the ventilation door 31 is controlled to the position where the gap between the blower 4 and the evaporator 5 is closed, there is a small gap 3 in the ventilation door 31.
4 is arranged so that only a small amount of the air sent by the blower 4 passes through the gap 34 and flows into the evaporator 5.

A flowchart showing the arithmetic processing of the present invention is shown in Figure 3.
Shown below. That is, it determines the magnitude relationship between the vehicle interior temperature Tc and the interior temperature Tcz (usually set between 35° and 4512 degrees) set for forced ventilation operation, and when Tc≦Tc1, the conventional system ② Performs the arithmetic processing. T
When c>Tc1, that is, when the vehicle interior temperature Tc is higher than the interior temperature Tcl set for forced ventilation operation, the operating state of the compressor is determined, and when the compressor is not operating, the conventional calculation process (■) is performed. I do. In addition, when the compressor is controlled to operate, the above-mentioned forced ventilation is performed for the set time T+ of forced ventilation operation with all internal air intake.
(Usually, it takes about 30 seconds to 5 minutes).

The operating state of the forced ventilation will be explained below with reference to FIG. 1.

Inside/outside air switching door 1 is connected to inside air intake 2, outside air intake 3
The ventilation door 31 is controlled to a position where it is not conductive, that is, all internal air is introduced, and the ventilation door 31 is controlled to a position where the exhaust duct 33 is conductive.

The blower air volume is controlled to the maximum, and high-temperature vehicle interior air taken in from the interior air intake port 2 in a state of full interior air passes through the exhaust duct 33 and is discharged to the outside of the vehicle interior, thereby performing forced ventilation. Here, when the ventilation door 31 is controlled to the position where the gap between the blower 4 and the evaporator 5 is closed as described above, the reason why the small gap 34 is provided in the ventilation door 31 is that the compressor is closed during the forced ventilation operation. This is to enable heat exchange by allowing a certain amount of air to pass through the evaporator 5 in order to eliminate problems in the refrigeration cycle since the air conditioner is operated and cooling operation is performed at the same time. Further, the air that has passed through the evaporator 5 and has been cooled is blown out through the vent outlet 9 and the like. In addition, the evaporator 5 is given a sufficient amount of time (
-T+), each floor door 11°, vent door 12, and defrost door 13 are controlled so that the floor air outlet 8, vent air outlet 9, and defroster air outlet 10 become non-conductive, and air is blown from the inside air intake port 2 by the blower 4. The configuration may be such that all the indoor air is exhausted to the outside of the vehicle through the exhaust duct 33.

Therefore, since the refrigeration cycle is also activated at the same time as the forced ventilation to exhaust the high-temperature interior air to the outside of the vehicle, the evaporator 5 can perform sufficient cooling operation in the time required for forced ventilation (='rt). Because the temperature has dropped to the desired temperature, cold air is blown out immediately after forced ventilation and when normal operation resumes. .

A second embodiment is shown in FIG. The difference from the previous embodiment is that the entrance of the exhaust duct 33 leading to the outside of the vehicle is provided between the evaporator 5 and the heater core 7. Further, a ventilation door 31 that is conductive or non-conductive is provided at the entrance of the exhaust duct 33.

Control during forced ventilation in the second embodiment will be described below. The inside/outside air switching door 1 is placed in a position where the inside air intake port 2 is conductive and the outside air intake port 3 is not conductive, and the ventilation door 31 is placed in a position where the exhaust duct 33 is connected, and the floor door 11, vent door 12, and defrost door 13 Each floor air outlet 8
, the vent outlet 9, and the defroster outlet 1o are controlled to be non-conductive. Blower 4 from inside air intake 2
The air sucked in through the evaporator 5 passes through the exhaust duct 33.
is discharged outside the vehicle. The outlet of the exhaust duct 33 does not need to be in the outside air inlet 3, and only needs to be connected to the outside of the vehicle, so apart from the method of integrating it with the unit,
Another method is to create a duct that leads to the outside of the vehicle.

In the second embodiment, the floor door 11, vent door 12, and defroster door 13 in the floor outlet 8, vent outlet 9, and defroster outlet 10 are controlled to be non-conductive at the same time during forced ventilation.

Therefore, according to the second embodiment, cold air is blown out immediately after forced ventilation and when switching to normal operation. Also, when adjusting the gym pressure and temperature, turn off the compressor and blower.
Another feature is that the ram pressure air volume increases because air that does not pass through the evaporator 5 is also added.

Another embodiment of the present invention will be described with reference to FIGS. 4 and 5. In FIG. 4, 101 is an intake blower;
2 is an evaporator, 103 is a heater core, 104 is an outside air closing door, 105 is an inside/outside air switching door, 106 is an outside air introduction door,
107 is an air mix door, 108 is a differential door, 109
1 is a vent door, 110 is a 70 door, and 111 is a simplified diagram of means for forming an air system such as a casing and ducts that enclose each of the above-mentioned devices. In Fig. 4, each door is arranged as shown by the solid line, and the intake proar 1
01 and the evaporator 102 are operated and kept in this mode for a certain period of time after starting, air flows as shown by the arrow and the bad odor emitted from the evaporator 102 flows out of the vehicle. FIG. 5 shows an example of the arrangement of each door during ram pressure and temperature control, and this figure shows the operation in the heater mode. Outside air introduction door 106
, and the air introduced into the car by ram pressure is introduced into the car as shown by the arrow. By changing the opening degree of the air mix door 107, the temperature of the louse blown into the vehicle interior (FLOOR) is controlled.

As explained above, this embodiment has the advantage that precooling and ram pressure and temperature can be easily controlled by simply switching the door in the duct.

〔Effect of the invention〕

As described in detail above, according to the present invention, when ventilation is required, so-called forced ventilation, in which the air inside the vehicle is discharged to the outside of the vehicle, becomes possible without adding a large number of parts to the conventional air conditioning system.

[Brief explanation of drawings]

FIG. 1 is a control system diagram of the automotive air conditioner of the present invention, and FIG.
The figure shows a modification of the present invention, and FIG. 3 shows the first embodiment of the present invention.
Flowchart showing the calculation processing flow of the embodiment, No. 4,
FIG. 5 is a drawing showing another embodiment of the present invention. 1...Inside/outside air switching door, 2...Inside air intake, 3...
・Outside air intake, 4...Blower, 5...Evaporator, 6.
... Air mix door, 7... Heater core, 8...
Floor outlet, 9... Vent outlet, 10... Defroster outlet, 11... Floor door, 12... Vent door, 13... Defroster door, 14... Outside temperature sensor, 15...・Room temperature sensor, 16...Air conditioning unit, 17...Intake temperature sensor, 18...Water temperature sensor,
19... Opening sensor, 20 control unit, 21...
Interface, 22... microcomputer,
23... Operation i-display device, 24... Output amplifier, 2
5... Actuator, 26... Actuator,
27...actuator, 28 actuator, 29
...Actuator, 30...Water cock, 3
1... Ventilation door, 32... Actuator, 33.
...Exhaust duct, 34...Gap, 101...Intake blower, 1o2...Evaporator, 104...Outside air closing door, 106...Outside air introduction door.

Claims (11)

[Claims] 1. A determining means for determining whether ventilation is necessary in a vehicle in which air is introduced from outside and outside the vehicle, cooled by an evaporator, and then discharged into the vehicle interior, and a maximum internal air intake state is determined based on the output of the means. An air conditioner for an automobile, characterized in that it is provided with a switching means for switching to the inside air and an exhaust means for exhausting the introduced inside air to the outside of the vehicle. 2. The determining means for determining whether ventilation is necessary according to claim 1 is configured to output an output when the room temperature is equal to or higher than a predetermined value. 3. A means for exhausting part or all of the introduced inside air to the outside of the vehicle before the introduced inside air is cooled by the evaporator according to either of claims 1 and 2. 4. A means for exhausting part or all of the introduced inside air to the outside of the vehicle after the introduced inside air is cooled by an evaporator according to either claim 1 or 2. 5. A means for increasing the air speed of the blower to a maximum air volume during exhaust control according to any one of claims 1 to 4. 6. 4. The air conditioner for an automobile according to claim 3, further comprising an exhaust duct having one end opened in the duct portion between the blower and the evaporator and the other end communicating with the outside of the vehicle. 7. The air conditioner for an automobile according to claim 6, further comprising a ventilation door that selectively opens and closes an inlet of the exhaust duct and an inlet of the evaporator. 8. 8. The air conditioner for an automobile according to claim 7, wherein the ventilation door is provided with a passage that allows part of the air from the blower to escape to the evaporator when the evaporator is closed. 9. 5. The air conditioner for an automobile according to claim 3, further comprising means for fully closing a cold air discharge port into the vehicle interior during the exhaust control. 10. 5. The air conditioner for an automobile according to claim 4, further comprising an exhaust duct having one end open to the downstream duct of the evaporator and the other end communicating with the outside of the vehicle. 11. The air conditioner for an automobile according to claim 10, further comprising a door for opening and closing the entrance of the exhaust duct.