JPH0891038A - Automotive air-conditioner - Google Patents

Abstract

PURPOSE: To carry out the efficient cooling by preventing the set of the car room temperature at an abnormal high temperature by forcibly canceling the abnormal set through the manual operation, when the inside air temperature is higher by a specific value or greater in comparison with the outside air temperature, and speedily lowering the temperature in the car room by carrying out the effective utilization of the outside air. CONSTITUTION: An inside air temperature detecting sensor 25 for detecting the temperature inside a car room in the case where a manual switch 22 for selecting the inside/outside air is switched to the inside air circulation mode side is installed, and a forcible selector means for the forcible switching to the outside air introducing mode up to the time when the temperature in the car room becomes lower than a specific set temperature, by canceling the switching state to the inside air circulation mode side of the manual switch 22 for selecting the inside/outside air, on the basis of the detection signal outputted from the inside air temperature detecting sensor 25 in the case where the temperature in the car room becomes lower than a prescribed set temperature, is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner equipped with an internal / external air switching manual switch for selectively switching between an internal air circulation mode and an external air introduction mode.

[0002]

2. Description of the Related Art Normally, an air conditioner (automatic air conditioner for automobiles) provided in an automobile has a fully automatic mode for automatically controlling the switching between an inside air circulation mode and an outside air introduction mode and fully automatic air conditioning for the passenger compartment. It is configured such that the occupant can manually select each of the switches to select one of a manual mode in which the occupant operates under desired conditions.

As an air conditioner of this type, as shown in, for example, Japanese Utility Model Publication No. 57-46174 and Japanese Patent Application Laid-Open No. 60-61330, the temperature inside the vehicle (inside air temperature) and the temperature outside the vehicle are set in the full auto mode. Detects the temperature difference from the temperature (outside air temperature) and automatically sets the outside air introduction mode when this temperature difference is above a specified value, and automatically sets the inside air circulation mode when the temperature difference falls below a specified value to efficiently cool the room. It is known to do the following.

In the fully automatic mode of this air conditioner,
The cooling operation is performed as follows. That is, as shown in FIG. 5, since the automobile is stopped under the scorching sun, the inside air temperature (cabin temperature) t ₁ (° C.) is the outside air temperature t.
If there is a temperature difference that is considerably higher than ₂ (° C) and is equal to or greater than the predetermined value T (° C), the outside air introduction mode is automatically set at the beginning of operation of the air conditioner to rapidly reduce the inside air temperature. Later, the difference between the inside air temperature and the outside air temperature is the predetermined set value T.
At time S when the temperature falls below (° C.), the mode is automatically switched to the internal air circulation mode to perform normal cooling operation.

When the occupant manually sets the manual mode by switching a predetermined switch, the above control is not performed. That is, in the manual mode, the operation is forcibly performed based on the manually set air conditioning conditions regardless of the temperature difference between the temperature inside the vehicle interior and the temperature of the outside air.

[0006]

However, in the conventional automotive air conditioner as described above, when the occupant manually sets the air conditioning condition, that is, when the manual mode is set, the abnormal air conditioning condition is set. Then, the operation will be started so that the air conditioning conditions according to the setting will be started, so the temperature of the various electronic devices for air conditioning controlling the air conditioner and the temperature inside the vehicle will be extremely high. Therefore, the temperature-sensitive electronic device for air conditioning control may be adversely affected.

Further, when the temperature in the vehicle compartment is a predetermined value or higher (for example, 70 ° C. or higher), the inside air circulation mode is manually set in the air conditioner to recirculate the inside air in the vehicle compartment. In such a case, the temperature inside the passenger compartment does not drop at a high temperature, and it takes a considerably long time to reach the set temperature. Therefore, in such a case, the actual situation is that efficient cooling cannot be performed.

The present invention has been made in view of the above circumstances, and an object thereof is to forcibly perform an abnormal setting by manual operation when the inside air temperature is higher than the outside air temperature by a predetermined value or more. It can be canceled and the temperature inside the passenger compartment can be prevented from being set to an abnormally high temperature, and by effectively utilizing the outside air at that time, the temperature inside the passenger compartment can be rapidly lowered to perform efficient cooling. An object of the present invention is to provide an air conditioning system for an automobile capable of performing the above.

[0009]

In order to achieve the above object, the present invention provides an air conditioner for an automobile equipped with an internal / external air switching manual switch for selectively switching between an internal air circulation mode and an external air introduction mode. In the case where the inside air temperature detection sensor for detecting the temperature inside the vehicle compartment when the inside / outside air switching manual switch is switched to the inside air circulation mode side is provided, and when the temperature inside the vehicle compartment is equal to or higher than a predetermined set temperature, Based on the detection signal output from the inside air temperature detection sensor, cancel the switching state of the inside and outside air switching manual switch to the inside air circulation mode side,
Forced switching means is provided for forcibly switching to the outside air introduction mode until the temperature inside the vehicle compartment falls below a predetermined set temperature.

[0010]

[Operation] When the temperature inside the vehicle rises and becomes considerably higher than the outside air temperature when parked under the scorching sun, the outside air is forcibly forced regardless of the condition setting by manual operation (manual setting). Since the introduction mode is set, the low temperature outside air is effectively used, and the temperature in the vehicle interior is rapidly reduced. Therefore, even if an abnormal air conditioning condition is set by a manual operation, it is possible to avoid the occurrence of an abnormal situation that causes such an air conditioning condition.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to.

FIG. 1 shows the structure of an air conditioner 1 to which the present invention is applied. In FIG. 1, 2 is an air conditioning case, 3 is a blower, 4 is a blower motor, 5 is an evaporator, and 6 is a heater. .

As shown in FIG. 1, an inside air introduction port 8 and an outside air introduction port 9 are provided at the most upstream end of the above-mentioned air conditioning case 2, and these introduction ports 8 and 9 are inside and outside air switching actuators. It is configured to be opened and closed by an inside / outside air switching door 11 which is rotationally driven by 10. Thus, when the inside air circulation mode is selected, the inside air introduction port 8 is opened and the outside air introduction port 9 is closed by the inside / outside air switching door 11, and when the outside air introduction mode is selected, the outside air introduction port 9 is opened and the inside air introduction port 8 is opened. The inside / outside air switching door 11 is closed.

The blower 3 is for introducing air into the air conditioning case 2 from the inside air introduction port 8 or the outside air introduction port 9 and sending the air to the downstream side through the air conditioning case 2, and the downstream region of the blower 3 An evaporator 5 and a heater 6 are arranged in this order. The evaporator 5 constitutes a cooling cycle together with a compressor, a condenser and the like (not shown).

Further, an air mix door 12 is arranged in parallel at the location where the heater 6 is arranged.
The air sent to the heater 6 and the heater 6 according to the opening degree of 2
The ratio with the air that bypasses is adjusted.

Further, a pair of swing doors 13 and 14 are arranged on the downstream side of the heater 6, and an upper air outlet 15 and a lower air outlet 16 are provided at the most downstream end of the air conditioning case 2.
And a defroster outlet 17 are provided respectively.
Then, the air outlets 15, 16, 17 are selectively opened according to the rotational positions of the pair of swing doors 13, 14, and the upper air outlet 15 or the lower air outlet 16 reaches the occupant's face or feet. Air is blown toward the inner surface of the windshield or from the defroster outlet 17.

On the other hand, the operation unit 20 for controlling the operation of the above-mentioned air conditioner 1 includes a fully automatic mode changeover switch 2
1, an inside / outside air switching manual switch 22 including an inside air circulation mode selection switch 22a and an outside air introduction mode selection switch 22b, a temperature setting lever 23, an air volume adjusting lever 24, and the like. Of the instrument panel (not shown).

Further, as shown in FIG. 1, the air conditioner 1 of the present example has an inside air temperature detecting sensor 25 and a controller 2.
6 equipped with a manual switch 22 for switching between inside and outside air
The temperature inside the vehicle compartment when the switch is switched to the inside air circulation mode side is detected by the inside air temperature detecting sensor 25, and this detection signal is supplied to the controller 26 as a control signal.

Further, the above-mentioned controller 26 controls the inside air of the inside / outside air switching manual switch 22 based on the detection signal output from the inside air temperature detecting sensor 25 when the temperature inside the vehicle is equal to or higher than a predetermined set temperature. Forced switching means for canceling the switching state to the circulation mode side and forcibly switching to the outside air introduction mode until the temperature inside the vehicle interior falls below the predetermined set temperature, that is, the temperature inside the vehicle interior is above the predetermined set temperature. When the inside air circulation mode selection switch 22a is switched to the ON state at this time, the air conditioner is provided with a forced switching means for forcibly setting the outside air introduction mode without setting the inside air circulation mode. .

Thus, the controller 26 is operated based on the operation command signal output from the operation unit 20 and the detection signal (control signal) output from the inside air temperature detection sensor 25, and the control output from the controller 26 is controlled. In response to the signal, the inside / outside air switching actuator 10,
The blower motor 4, various doors 12, 13, 14 and the like are configured to be operated appropriately.

Next, the operation of the air conditioner 1 of this example will be described with reference to FIGS. 2 to 4. First, as the ignition switch of the automobile is turned on, the air conditioner 1 is started and the system is initialized.

Under this condition, the occupant operates the operation unit 20.
A predetermined control signal is input to the controller 26 in response to the switching operation of. That is, when the occupant turns on the full-auto mode changeover switch 21 to select the full-auto mode, a control signal to that effect is input to the controller 26. In this case, the controller 26 is based on various information signals such as the inside temperature and the outside temperature.
A predetermined calculation is performed in, and according to the calculation result,
The air conditioner 1 is automatically controlled so that the indoor temperature becomes the set temperature set by the temperature setting lever 23.

Further, when an occupant performs a switching operation on the inside / outside air switching manual switch 22, the full-auto mode is canceled and the mode corresponding to the switching operation is set. That is, when the outside air introduction mode selection switch 22b is turned on, the actuator 10 is forcibly operated regardless of the inside air temperature or the outside air temperature at that time, and the inside / outside air switching door 1
1 is arranged at the position shown by the solid line in FIG. 1 and the outside air inlet 9 is opened (outside air fixed state). And
Output calculation is performed under this state, and the air conditioner 1 is operated in the outside air introduction mode based on the calculation result.

The switch 22 for selecting the inside air circulation mode is also provided.
When "a" is switched to the ON state, the inside air circulation mode is set under the normal state, but in a special case, the inside air circulation mode selection switch 22a is forced to the outside air even though it is in the ON state. Set to deployment mode.

Specifically, when the room temperature when the switch 22a for selecting the inside air circulation mode is turned on is below a predetermined temperature (for example, 70 ° C. or less), the normal inside air circulation mode is set. . However, when the room temperature when the inside air circulation mode selection switch 22a is switched to the on state is equal to or higher than a predetermined temperature (for example, 70 ° C. or higher), this state is detected by the inside air temperature detection sensor 25, and An information signal to the effect is input to the controller 26, and accordingly, the ON state of the inside air circulation mode selection switch 22a is canceled and the outside air introduction mode is forcibly set (see line A in the flowchart of FIG. 2). And
When the indoor temperature in the outside air introduction mode is lowered to a predetermined temperature (for example, 64 ° C.), the controller 26
The internal air circulation mode is automatically switched by a control signal from (see line B in the flowchart of FIG. 2). In addition,
After this, the operation in the normal outside air introduction mode is continued, and when the inside air circulation mode selection switch 22a is switched to the off state, the actuator 10 returns to the outside air introduction mode (see FIGS. 3 and 4). .

According to the air conditioner 1 having such a configuration, when the occupant manually operates the inside air circulation mode selection switch 22a at the time of system startup (when the ignition switch is turned on), or in this mode. Sensor 25 for detecting the inside air temperature
If the detected temperature of the inside air temperature detection sensor 25 is 70 ° C. or higher, as shown in FIGS.
Switch 2 for selecting the internal air circulation mode until the temperature drops below 4 ° C
The outside air introduction mode is forcibly set regardless of the setting of 2a. Therefore, the temperature inside the vehicle compartment can be rapidly lowered by effectively utilizing the outside air having a temperature relatively lower than the inside air.

The adoption of such a structure that rapidly lowers the temperature of the high temperature seed chamber by utilizing the outside air is particularly effective when the operation switch (not shown) of the air conditioner 1 is turned off. This is effective, and since the air-conditioning apparatus 1 itself can be efficiently cooled by being configured to perform such control, overheating can be prevented and the heat resistant temperature can be suppressed low. Therefore, it is possible to prevent the temperature of various electronic devices for automobiles from rising, and it is possible to avoid the deterioration or damage of the electronic components constituting these electronic devices.

Further, a system abnormality or an operation which cannot be normally considered (for example, a condition in which the operation switch of the air conditioner 1 remains in the OFF state in spite of the room temperature being 70 ° C. or higher, or an abnormality) Input settings under various air conditioning conditions)
Even when the above is performed, the system operation under an abnormally high temperature condition can be avoided, and the air conditioner 1 and other automobile parts can be protected.

The embodiment of the present invention has been described above.
The present invention is not limited to this embodiment, and various modifications and changes can be made based on the technical idea of the present invention. For example, the vehicle compartment temperature that is the reference for canceling the ON state of the inside air circulation mode selection switch 22a and forcibly setting the outside air introduction mode is not certified as 70 ° C., and the temperature may be changed as necessary. It is possible. further,
The temperature serving as a reference for switching from the forced outside air introduction mode to the inside air circulation mode is not limited to 64 ° C., and the temperature can be changed as necessary.

[0030]

As described above, according to the present invention, the inside air temperature detecting sensor for detecting the temperature inside the passenger compartment when the manual switch for switching inside / outside air is switched to the inside air circulation mode side is provided, and the temperature inside the passenger compartment is When the temperature is equal to or higher than a predetermined set temperature, based on the detection signal output from the inside air temperature detection sensor, the switching state of the inside / outside air switching manual switch to the inside air circulation mode side is canceled, and the temperature inside the vehicle compartment is cancelled. Since a forced switching means for forcibly switching to the outside air introduction mode is provided until the temperature becomes equal to or lower than a predetermined set temperature, when the inside air temperature is higher than the outside air temperature by a predetermined value or more, a manual operation is performed. It is possible to forcibly cancel the abnormal setting and prevent the temperature inside the vehicle from rising to an abnormally high temperature. To be able to reduce the speed can be performed efficiently cooling.

Therefore, when the temperature in the vehicle compartment is abnormally high, such as when the vehicle is parked under the scorching sun, even if the air conditioner is set to the inside air circulation mode by manual operation, this state is canceled and the outside air is used. The temperature is rapidly reduced, and even if an abnormal air conditioning condition is manually set, the operation under that condition is not performed and the temperature is rapidly reduced by the outside air. It is possible to reliably avoid a situation in which the operating characteristics are adversely affected by being exposed to an abnormally high temperature.

Further, since the control as described above is performed,
The heat resistant temperature of the air conditioner (the maximum temperature to which the air conditioner is expected to be exposed) can be lowered, so that it is possible to improve durability and reliability and reduce costs.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an air conditioner to which the present invention is applied.

FIG. 2 is a flow chart for explaining the operation of the air conditioner according to the present invention.

FIG. 3 is an operation explanatory diagram for explaining the operation of the air conditioner according to the present invention, and showing that switching to the outside air introduction mode or the inside air circulation mode is performed based on the vehicle compartment temperature.

FIG. 4 is a view for explaining the operation of the air conditioner according to the present invention, and shows the relationship between the vehicle compartment temperature, the on / off state of the inside air circulation mode selection switch, and the operation of the inside / outside air switching actuator. It is operation | movement explanatory drawing to show.

FIG. 5 is an operation explanatory view for explaining an operation in a fully automatic mode state in a conventional air conditioner.

[Explanation of symbols]

 1 Air Conditioner 8 Inside Air Inlet 9 Outside Air Inlet 11 Inside / Outside Air Changeover Door 20 Operating Unit 21 Full Auto Mode Changeover Switch 22 Inside / Outside Air Changeover Manual Switch 22a Inside Air Circulation Mode Selection Switch 22b Outside Air Introduction Mode Selection Switch 25 Inside Air Temperature Detection Sensor 26 Controller

Claims (1)

[Claims] 1. An automotive air conditioner equipped with an internal / external air switching manual switch for selectively switching between an internal air circulation mode and an external air introduction mode, wherein the internal / external air switching manual switch is switched to the internal air circulation mode side. A sensor for detecting the inside air temperature for detecting the temperature inside the vehicle compartment at the time is provided, and based on a detection signal output from the sensor for detecting the inside air temperature when the temperature inside the vehicle compartment is equal to or higher than a predetermined set temperature, A forced switching means is provided for canceling the switching state of the manual switch for switching the inside / outside air to the inside air circulation mode side and forcibly switching to the outside air introduction mode until the temperature in the vehicle compartment falls below a predetermined set temperature. Air-conditioning system for automobiles.