JPH0558140A - Car air-conditioner - Google Patents

Abstract

PURPOSE:To provide an airconditioner for car excellent in the reliability, with which blur on the wind whield can be removed at all times and a good view is ensured. CONSTITUTION:Open air or intra-cabin air is inhaled by a blower fan 9, and the inhaled air is passed through a cooler 10, and only a required amount is passed to a heater core 11. The air after passing these cooler 10 and heater core 11 is led via a duct 7 to blowout holes in the car cabin. In the neighborhood of the heater core 11, air mix dampers 12a, 12b are furnished to adjust the air amount passed to the heater core 11. When the operation is stopped, a control part 40 sets operating of the blower fan 9 and opening of the air mix dampers 12a, 12b when the sensed temp. To by an open air temp. sensor 53 becomes below the set value Tx, and also opens at least defrosting blowout holes 5a, 5b, and the warm wind obtained through the heater core 11 is left blowing out of the defrosting blowout holes 5a, 5b.

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 for air conditioning a vehicle interior.

[0002]

2. Description of the Related Art A vehicle air conditioner used for a vehicle such as an automobile sucks outside air or air inside the vehicle by operating a blower fan, passes the sucked air through a cooler, and passes a required amount through a heater core. The air that has passed through the heater core and the heater core is guided by a duct to the air outlet in the passenger compartment.

In the vicinity of the heater core, an air mix damper for adjusting the amount of ventilation to the heater core is provided. The opening of this air mix damper is controlled according to the temperature detected by the passenger compartment temperature sensor, that is, the air conditioning load, so that the temperature of the air blown into the passenger compartment is adjusted and the passenger compartment temperature is maintained at the set value. To be done.

The air outlets are provided in the instrument panel, and there are a plurality of air outlets such as a defrost air outlet, a face air outlet, and a foot air outlet along the vertical direction.

Each of the air outlets is provided with an openable / closable damper, and among these dampers, the face air outlet and the foot air outlet are controlled to be opened / closed in accordance with the air conditioning load based on the vehicle interior temperature. For example, when the passenger compartment temperature is low and the air conditioning load is on the heating side, the foot outlet located near the foot of the passenger is opened, and so-called foot blowing is performed. When the vehicle interior temperature is high and the air conditioning load is on the cooling side, the face outlet near the passenger's face or chest is opened, and so-called face outlet is performed.

When the vehicle interior temperature is medium and the air conditioning load is in the intermediate region between the heating side and the cooling side, both the foot outlet and the face outlet are opened, and so-called bi-level outlet is performed.

The opening and closing of the defrost outlet of each damper is dependent on the manual operation of the passenger, and when the damper is opened, the conditioned air is blown to the inner surface of the front glass. That is, when "cloudy weather" occurs on the inside of the front glass, the "cloudy weather" can be removed by opening the defrost outlet.

[0008]

By the way, in the above vehicle air conditioner, when the operation, that is, the air conditioning is stopped, the dehumidifying function is lost, so that "cloudy weather" occurs on the front glass especially when the outside air temperature is low. This "cloudy weather"
Often obstruct the driver's visibility.

The present invention takes the above circumstances into consideration,
It is an object of the present invention to provide a highly reliable vehicle air conditioner capable of always removing the "cloudy weather" of the front glass and ensuring a good visibility.

[0010]

A vehicle air conditioner according to the present invention comprises an outside air temperature sensor for detecting the temperature of the outside air, and a blower fan when the temperature detected by the outside air temperature sensor is below a set value when operation is stopped. And means for setting the opening of the air mix damper and opening at least the defrost outlet.

[0011]

In the vehicle air conditioner of the present invention, when the outside air temperature becomes lower than the set value when the operation is stopped, the operation of the blower fan and the opening of the air mix damper are set, and at least the defrost outlet is opened.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a vehicle according to the present invention, for example, a passenger car, which has a front glass 2 and an outside air inlet 3 at the front. There is a vehicle interior air introduction port 4 adjacent to the outside air introduction port 3, and a duct 6 and a duct (heater unit) 7 are connected from these introduction ports 3 and 4 to an instrument panel 5 in the vehicle interior.

The instrument panel 5 is a front panel.
Defrost outlet 5a, side defrost outlet 5
b, face outlet 5c, and foot outlets 5d, 5
have e.

In the duct 6, an inside / outside air damper 8 is provided at the boundary between the inlets 3 and 4. This inside / outside air damper 8
Has a drive motor 8M and is for relatively adjusting the ventilation amount of the outside air introduction port 3 and the ventilation amount of the vehicle interior air introduction port 4.

A blower fan 9 is provided near the inside / outside air damper 8 in the duct 6. This blower fan 9
Has a drive motor 9M and is for sucking outside air or vehicle interior air from the outside air inlet 3 and the vehicle interior air inlet 4.

The intake air of the blower fan 9 is guided to the cooler 10 by the duct 6 and cooled there. The cooler 10 is a heat exchanger (evaporator) of a refrigeration cycle (not shown). The air that has passed through the cooler 10 is duct 7
From there, from the outlets 5a, 5b, 5c, 5d,
5e. Inside the duct 7, a heater core 11 and air mix dampers 12a and 12b are provided.

Here, the heater core 11 radiates heat of engine cooling water as heating heat. The air mix dampers 12a and 12b have a drive motor 12M,
By changing the opening in the direction of the arrow shown in the linked state,
This is for distributing a predetermined amount of air that has passed through the cooler 10 to the heater core 11.

Further, the damper 13a is provided at the openings of the outlets 5a and 5b, and the damper 13b is provided at the openings of the outlet 5c.
A damper 13c is provided in the openings of d and 5e. These dampers 13a, 13b, 13c are driven by a drive motor 13M. A vehicle interior temperature sensor 30 is attached to the ceiling surface of the vehicle interior as means for detecting the air conditioning load in the vehicle interior.

On the other hand, reference numeral 40 is a control section for performing overall control of the vehicle air conditioner, which comprises a microcomputer and its peripheral circuits. This control unit 40
In addition, the drive motors 8M, 12M, 13M, the vehicle interior temperature sensor 30, the operation unit 41, the electromagnetic clutch 50, and the voltage regulator 5
1, a vehicle interior humidity sensor 52, an outside air temperature sensor 53, a vehicle speed sensor 54, and a water temperature sensor 55 are connected. The electromagnetic clutch 50 serves to transmit or cut off the power of the engine to the compressor of the refrigeration cycle including the cooler 10. The voltage regulator 51 outputs a voltage of a level according to a command from the control unit 40. This output is sent to the drive motor 9M. The vehicle speed sensor 54 detects the traveling speed of the automobile. The water temperature sensor 55 detects the temperature of engine cooling water flowing in the heater core 11. The control unit 40 has the following functional means. (1) A means for obtaining a difference ΔT between the temperature Ta detected by the vehicle interior temperature sensor 30 and a preset value Ts as an air conditioning load.

(2) A means for controlling the operation of the cooler 10 (ON / OFF of the electromagnetic clutch 50), the opening degree of the air mix dampers 12a, 12b, and the speed of the blower fan 9 according to the air conditioning load. (3) A means for opening the damper 13b and closing the damper 13c when the air conditioning load is on the cooling side (the temperature inside the vehicle is high). (4) A means for closing the damper 13b and opening the damper 13c when the air conditioning load is on the heating side (the temperature inside the vehicle is low). (5) A means for opening both the dampers 13b and 13c when the air conditioning load is in the intermediate region between the cooling side and the heating side.

(6) When the detected temperature To of the outside air temperature sensor 53 becomes equal to or lower than the set value Tx when the operation is stopped, the operation of the blower fan 9 and the opening of the air mix dampers 12a and 12b are set, and at least the defrost outlet is set. 5a,
Means to open 5b. In addition, 60 is a seat for boarding.
Next, the operation will be described with reference to FIGS.

The operation unit 41 is used to start operation. Then, the control unit 40 turns on the electromagnetic clutch 50 to turn on the compressor of the refrigeration cycle, and also activates the drive motor 9M to turn on the blower fan 9. When the compressor is turned on, the refrigerant in the refrigeration cycle circulates and the cooler 10 functions as an evaporator.

When the blower fan 9 is turned on, the outside air or the air in the vehicle compartment is sucked in and cooled by the cooler 10. At this time, the air mix dampers 12a, 1
If 2b is open, part of the air that has passed through the cooler 10 is heated by the heater core 11, and the warm air is mixed with the cool air from the cooler 10 and the air outlets 5a, 5b, 5c, 5
Guided to d and 5e.

In this case, the control unit 40 obtains the difference ΔT between the vehicle interior temperature Ta detected by the vehicle interior temperature sensor 30 and the set value Ts as the air conditioning load, and uses the air conditioning load as the temperature control command value. From the setting conditions shown in FIG. 2, the opening degree of the air mix dampers 12a and 12b, and the damper 1
The open / closed states (blowing position) of 3b and 13c are set respectively.

That is, if the vehicle interior temperature Ta is high and the air conditioning load is on the cooling side, the air mix dampers 12a, 12
As the opening of b decreases, as shown in FIG.
3b opens and the damper 13c closes. Therefore, cool air is blown from the face outlet 5c toward the passenger's face and chest (face blowout).

If the vehicle interior temperature Ta is low and the air conditioning load is on the heating side, the opening degree of the air mix dampers 12a and 12b becomes large, and at the same time the damper 13b is closed and the damper 13c is closed.
Opens. Therefore, warm air is blown from the foot outlets 5d and 5e toward the feet of the passenger (foot blowing).

If the air conditioning load is in the intermediate region between the cooling side and the heating side, the opening degree of the air mix dampers 12a, 12b becomes medium and the dampers 13b, 13c both open.
Therefore, the air of medium temperature is blown by the foot outlets 5c, 5d,
It is blown from 5e toward the passenger's face, chest and feet at the same time (bi-level blow). Further, the control unit 40 is configured as shown in FIG.
The speed of the blower fan 9 is set based on the setting conditions shown in.

That is, when the air conditioning load is large on the cooling side and the heating side, the high speed "H" is set. The speed is sequentially set from the medium speed "M" to the low speed "L" as the air conditioning load shifts to the intermediate region between the heating side and the cooling side.
On the other hand, when the defrost mode is set by the operation unit 41,
The control unit 40 opens the damper 13a. When the damper 13a is opened, the wind is blown from the defrost outlets 5a and 5b toward the front glass 2. By the way, when the operation unit 41 is operated to stop the operation, the operation, that is, the air conditioning is stopped. When the outside air temperature is low when the operation is stopped, there is no dehumidifying action, so that “fog” occurs on the front glass 2.

Therefore, the control unit 40 monitors the detected temperature To of the outside air temperature sensor 53 when the operation is stopped, and detects the detected temperature To.
Is below the set value Tx, the blower fan 9 is operated and the air mix dampers 12a and 12b are opened, and at least the defrost outlets 5a and 5b (damper 13
Open a). Specifically, as shown in FIG. 3, first, the difference ΔT (= Ta−Ts) between the vehicle interior temperature Ta and the set value Ts.
Determines whether is greater than zero. If ΔT is smaller than zero, that is, if the vehicle interior temperature Ta is lower than the set Ts,
It is determined whether or not the detected temperature Tw of the water temperature sensor 55 is higher than the set value of 50 degrees C.

At this time, immediately after the engine is started, the detected temperature Tw is still lower than 50 ° C., so the operation in the defrost mode is executed. In this defrost mode operation, the damper 13a is fully opened and 100% of the warm air that has passed through the heater core 11 is blown out from the defrost outlets 5a and 5b.

When the temperature Tw of the engine cooling water rises to 50 degrees C or higher, the foot mode operation is executed. In this foot mode operation, the damper 13a is slightly opened, the damper 13c is fully opened, and a small amount of warm air that has passed through the heater core 11 is blown out from the defrost outlets 5a and 5b, and the remaining warm air is discharged into the foot outlets 5d and 5e. It is something that is blown out from.

When the temperature Ta inside the vehicle reaches the set value Ts due to the blowing of warm air and ΔT becomes larger than zero, the operation in the defrost / foot mode is executed. In this defrost / foot mode operation, the opening degree of the damper 13a and the opening degree of the damper 13c are set to the detected humidity of the vehicle interior humidity sensor 52, the detected temperature To of the outside air temperature sensor 53, and the vehicle speed sensor 5.
The hot air is distributed to the defrost outlets 5a and 5b and the foot outlets 5d and 5e by performing relative control according to the detected vehicle speed of No. 4, and three modes (1) (2) (3) shown in FIG. )
There is. In the defrost / foot mode (1), the blowing air volume of the defrost outlets 5a and 5b is the foot outlet 5d,
Slightly less than the blowing air volume of 5e. In the defrost / foot mode (2), the blowout air volumes of the defrost outlets 5a and 5b and the foot blowouts 5d and 5e are substantially the same. In the defrost / foot mode (3), the blowing air volume of the defrost outlets 5a and 5b is the foot outlet 5
It is much larger than the blowing air volume of d and 5e. For example, if the vehicle interior humidity, the outside air temperature To, and the vehicle speed are all low, the defrost / foot mode (1) is selected. When the vehicle interior humidity and the outside air temperature To are low and the vehicle speed is high, the defrost / foot mode (2) is selected. When the vehicle interior humidity and vehicle speed are high and the outside air temperature To is considerably low, the defrost / foot mode (3) is selected. The vehicle speed is considered in consideration of the fact that the temperature of the front glass 2 decreases as the traveling wind increases.

As described above, when the outside air temperature becomes low when the operation is stopped, operation of the blower fan 9 and opening of the air mix dampers 12a and 12b are set to obtain warm air, and the warm air is at least defrosted outlets 5a and 5b. It is possible to reliably remove the “cloudiness” of the front glass 2 by blowing it out from. Therefore, a good field of view can be secured and reliability can be improved. The present invention is not limited to the above embodiment, and various modifications can be made without departing from the scope of the invention.

[0035]

As described above, according to the present invention, when the outside air temperature becomes lower than the set value when the operation is stopped, the operation of the blower fan and the opening of the air mix damper are set, and at least the defrost outlet is opened. As a result, it is possible to provide a highly reliable vehicle air conditioner that can always remove the "cloudiness" of the front glass and secure a good field of view.

[Brief description of drawings]

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

FIG. 2 is a diagram showing setting conditions of an opening of the air mix damper, a blowing pattern, and a blower fan speed according to the embodiment.

FIG. 3 is a flow chart for explaining the operation of the embodiment.

FIG. 4 is a diagram showing a switching pattern of the blown air volume of the face outlet in the embodiment.

FIG. 5 is a diagram showing an example of a relationship between a change in a vehicle interior temperature and a change in a blowing pattern in the embodiment.

[Explanation of symbols]

2 ... Front glass, 5a ... Front defrost outlet, 5b ... Side defrost outlet, 11 ... Heater core, 12a, 12b ... Air mix damper, 13a, 1
3b, 13c ... Damper, 30 ... Vehicle interior temperature sensor, 40
... control unit, 53 ... outside air temperature sensor.

Claims (1)

[Claims] 1. A face air outlet and a foot air outlet provided in a vehicle compartment, a defrost air outlet provided in a vehicle interior facing a front glass, a blower fan for sucking outside air or vehicle interior air, and a blower fan of the blower fan. Ducts that guide the intake air to each of the air outlets, a cooler and a heater core provided in the ducts, an air mix damper for adjusting the amount of ventilation to the heater core, and a passenger compartment that detects the temperature in the passenger compartment. An outside air temperature sensor for detecting the temperature of outside air in a vehicle air conditioner equipped with a temperature sensor and a means for controlling the opening degree of the air mix damper according to the air conditioning load based on the detected temperature of the vehicle interior temperature sensor. When the temperature detected by the outside air temperature sensor is below the set value at the time of operation stop, the operation of the blower fan and the air mix damper An air conditioner for a vehicle, which is provided with means for setting the opening and at least opening the defrost outlet.