JPH04262914A - Automotive air-conditioner - Google Patents

Abstract

PURPOSE:To inhibit the termination of air-conditioning operation due to the temperature elevation of cooling water, and to maintain comfortable car interior environment by detecting the temperature of the cooling water of an internal combustion engine, and by forcibly switch-controlling an inside/outside air switching device into an inside air introduction state when the detected temperature exceeds a predetermined level. CONSTITUTION:A blower switch 32 and an air-conditioning switch 33 are turned ON, and when an air-conditioning device is operated, at the time of normal running, an outside air introduction switch 35a of an inside/outside change-over switch 35 is ON, while an inside/outside air switch door 21 of an inside/outside air switch device 2 is in an outside air introduction condition as indicated in the side (a). When the temperature of engine cooling water detected by a temperature sensor 4 exceeds a predetermined level under this condition, it is judged by a control device 3 whether the inside/ outside air switch door 21 is set to an outside air introduction position by a servo motor 26 in the inside/outside air switch device 2. When the door is set to the outside air introduction position, the servo motor 26 is operated, so that the inside/outside switch door 21 is forcibly moved to the side of an outside air introduction position (b).

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention is used for air conditioning inside a car. The present invention prevents the internal combustion engine cooling water temperature from rising and eliminates the suspension of air conditioning operation when the water temperature is high in a vehicle in which cooling air for the internal combustion engine for driving and cooling air for the air conditioner are provided in common. The present invention relates to an air conditioner for automobiles that can be used.

0002

[Background Art] When driving under the scorching summer sun while running an air conditioner, there is a limit to the amount of air that can be taken in as cooling air, which places a severe load on the internal combustion engine and increases the temperature of the cooling water. may cause overheating. In order to prevent such overheating, conventionally
As disclosed in Publication No. 8-188715, the temperature of the gas discharged from the compressor is detected, and when the temperature exceeds a predetermined temperature, the air introduced from outside the vehicle is switched to be introduced from the interior of the vehicle, and the cooling water is This prevented the water temperature from rising. However, if the temperature continues to rise, the operation of the air conditioner is temporarily stopped, the load on the internal combustion engine is reduced, and the water temperature is lowered.

0003

[Problems to be Solved by the Invention] Since such conventional air conditioners do not detect the cooling water temperature of the internal combustion engine, they are unable to completely control the increase in water temperature, and the problem is that the internal combustion engine overheats. Occasionally, the operation of the air conditioner must be temporarily stopped, which causes the temperature inside the vehicle to rise, making it impossible to maintain a comfortable environment.

The present invention solves these problems by providing a device that can prevent the temperature of the cooling water from rising and maintain a comfortable interior environment without stopping the air conditioning operation. With the goal.

[0005]

[Means for Solving the Problems] The present invention provides a cooling device,
an inside/outside air switching device that switches whether the air cooled by the cooling device and blown into the vehicle interior is introduced from outside the vehicle or from inside the vehicle; and a control device including a program control circuit that controls the inside/outside air switching device. an air conditioner for a vehicle, wherein the heat radiation part of the cooling device is disposed within the airflow of cooling air of the internal combustion engine for running the vehicle, comprising a temperature sensor for detecting the temperature of the cooling water of the internal combustion engine; The control device is characterized in that it includes means for forcibly controlling the inside/outside air switching device to an inside air introduction state when the temperature detected by the temperature sensor exceeds a predetermined value.

[0006]

[Operation] When the temperature of the cooling water of the internal combustion engine exceeds a predetermined value, the internal/external air switching device is forcibly switched to the internal air introduction state. Through this control, air that was previously introduced from outside the vehicle is introduced from inside the vehicle, and the already cooled air is used to reduce the amount of heat exchanged in the evaporator.

[0007] As a result, the amount of heat radiated from the condenser is reduced, the radiator cooling air of the internal combustion engine is not heated, and the influence on cooling performance is reduced, thereby preventing overheating of the internal combustion engine caused by a rise in the temperature of the cooling water. be able to. That is, a comfortable interior environment can be maintained without stopping the air conditioning operation.

[0008]

Embodiments Next, embodiments of the present invention will be explained based on the drawings. Figure 1 is a block diagram showing the configuration of an embodiment of the present invention, Figure 2
3 is a diagram showing the configuration of the cooling device according to the embodiment of the present invention, FIG. 3 is a diagram showing the configuration of the inside/outside air switching device in the embodiment of the present invention,
FIG. 4 is a diagram showing the state in which the embodiment of the present invention is mounted on a vehicle.

The embodiment of the present invention includes a cooling device 1, an inside/outside air switching device 2 for switching whether the air cooled by the cooling device 1 and blown into the vehicle interior is introduced from outside the vehicle interior or from the interior of the vehicle interior. A control device 3 including a program control circuit 3a for controlling the inside/outside air switching device 2 is provided, and the heat dissipation section of the cooling device 1 is disposed within the cooling airflow of the internal combustion engine for running the vehicle, and The control device 3 includes a temperature sensor 4 for detecting the temperature of the cooling water, and the control device 3 includes means for forcibly controlling the inside/outside air switching device 2 to the inside air introduction state when the temperature detected by the temperature sensor 4 exceeds a predetermined value. including.

As shown in FIG. 2, the cooling device 1 includes a compressor 11 that compresses refrigerant, a condenser 12 that cools the compressed refrigerant, a cooling fan 13 that supplies cooling air to the condenser 12, and a desiccant. It includes a receiver 14 through which the enclosed and compressed refrigerant passes, an expansion valve 15 which discharges the compressed refrigerant in the form of a mist, and an evaporator 16 which exchanges heat with the air from the inside/outside air switching device 2.

Further, as shown in FIG. 3, the inside/outside air switching device 2 includes an inside/outside air switching door 21 for switching between introducing inside and outside air;
One end is connected to this inside/outside air switching door 21 and the door center 2
A link 23 that rotates around 2 as a fulcrum, and this link 23
A rod 24 rotatably connected to the other end of the rod 24, and a motor link 25 rotatably connected to the other end of the rod 24.
and a servo motor 26 to which the other end of the motor link 25 and a rotating shaft are fixed and rotated under the control of the control device 3;
A fan 27 that supplies air to the evaporator 16 and a motor 28 that provides rotational force to the fan 27 are provided.

Next, the operation of the embodiment of the present invention constructed as described above will be explained. FIG. 5 is a flowchart showing the flow of operation of the control device in the embodiment of the present invention.

When the driver turns on the ignition switch 31, blower switch 32, and air conditioning switch 33, the air conditioner is activated. During normal driving, the outside air selection switch 35 on the air conditioning control panel 34 lights up when the outside air introduction switch 35a is in the ON state, and the outside air switching door 21 of the inside/outside air switching device 2 is on the side a shown in FIGS. 1 and 3. It is located in a state where outside air is introduced.

When the temperature of the cooling water of the internal combustion engine exceeds a predetermined value, the temperature sensor 4 detects the temperature and sends a detection signal to the control device 3. The control device 3 receives the detection output and determines whether the servo motor 26 in the inside/outside air switching device 2 has set the inside/outside air switching door 21 to the outside air introducing position. If the outside air introduction position is set, the servo motor 26 is operated to move the inside/outside air switching door 21 to the inside air introduction position b shown in FIGS. 1 and 3, and the inside air introduction switch 35b on the air conditioning control panel 34 is turned on. status and the indicator lights up.

Thereafter, the air conditioning operation is performed in the inside air introduction state, but the driver can switch the inside/outside air switching door 21 to the outside air introduction position by pressing the outside air introduction switch 35a. However, if the temperature of the cooling water still exceeds the predetermined value at the time of switching, the inside air introduction state is automatically continued as is.

In this way, when the water temperature of the internal combustion engine exceeds a predetermined value, the cold air inside the vehicle is forcibly supplied to the air conditioner 1, the amount of heat exchanged by the evaporator 16 is reduced, and the amount of heat released by the condenser 12 is reduced. The cooling performance of the radiator 17 is made to have a margin.

[0017]

As explained above, according to the present invention, it is possible to prevent the temperature of the cooling water of the internal combustion engine from rising when the air conditioner is operating, eliminate the stoppage of the air conditioning operation due to the rise in water temperature, and create a comfortable interior environment in the vehicle. It has an effect that can be maintained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing the configuration of a cooling device according to an embodiment of the present invention.

FIG. 3 is a diagram showing the configuration of an inside/outside air switching device in an embodiment of the present invention.

FIG. 4 is a diagram showing how the embodiment of the present invention is mounted on a vehicle.

FIG. 5 is a flowchart showing the flow of operations of the control device in the embodiment of the present invention.

[Explanation of symbols]

1 Cooling device 2　　　　Internal/external air switching device 3 Control device 3a Program control circuit 4 Temperature sensor 11 Compressor 12 Capacitor 13 Cooling fan 14 Receiver 15 Expansion valve 16 Evaporator 17 Radiator 21　　　Inside/outside air switching door 22 Door center 23 Link 24 Rod 25 Motor link 26 Servo motor 27 Fan 28 Motor 31 Ignition switch 32 Blower switch 33 Air conditioning switch 34 Air conditioning control panel 35　　　　　Internal/external air selection switch 35a Outside air introduction switch 35b Inside air introduction switch 36 Mode selection switch 37 Outside air introduction duct

Claims (1)

[Claims] [Claim 1] A cooling device, an inside/outside air switching device for switching whether air cooled by the cooling device and blown into the vehicle interior is introduced from outside the vehicle or from inside the vehicle, and controlling the inside/outside air switching device. and a control device including a program control circuit for controlling the cooling water of the internal combustion engine. It is characterized by comprising a temperature sensor for detecting temperature, and the control device including means for forcibly controlling the inside/outside air switching device to an inside air introduction state when the temperature detected by the temperature sensor exceeds a predetermined value. Automotive air conditioner.