JPH08244442A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE: To select an air blow mode appropriately immediately after starting of heating operation so that any uncomfortable feeling is not given to occupants and cloudiness of a front glass is prevented automatically. CONSTITUTION: When a temperature detected by a water temperature sensor 15 which detects an engine cooling water temperature is lower than a set temperature, an air blow mode switchover means 16 selects a DEF mode in which air is blown directly to a front glass. Also the air blow mode switchover means 16, when the detected temperature is higher than the set temperature and dewing signals are transmitted from a dewing sensor 18 provided on the inner surface of the front glass 17, blows air directly on the front glass 17, selects an H/D mode to blow air into foot, and selects an HEAT mode to blow air into foot when dewing signals are not transmitted from the dewing sensor 18.

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, and more particularly to
The present invention relates to a vehicle air conditioner that appropriately selects a blowing mode immediately after a heating operation is started.

[0002]

2. Description of the Related Art Generally, in a vehicle air conditioner, engine cooling water is caused to flow in a heater core provided in a unit at the front of the vehicle to heat the air sucked into the unit to heat the vehicle interior. I have to. In such a vehicle air conditioner, if the heating operation is started immediately after the engine is started, such as when the vehicle is parked outdoors for a long time in winter,
Since it takes some time for the temperature of the engine cooling water to rise, the air passing through the heater core cannot be sufficiently heated. Therefore, conventionally, until the temperature of the engine cooling water rises, air is blown to the inside of the vehicle in the DEF mode so that the cool air does not directly hit the occupant, and the temperature of the water increases after the temperature rises. The / D mode and the HEAT mode are switched.

[0003]

However, when the window glass, especially the windshield, is fogged, the blowing mode may be switched simply based on the engine cooling water temperature. The DEF mode is switched to the H / D mode and the HEAT mode, and the front field of view cannot be secured.
It is troublesome to select the mode again. On the other hand, it is desired to change the blowing mode so that the occupant does not feel as uncomfortable as possible.

In view of the above problems, therefore, the present invention makes it possible to select a ventilation mode immediately after the start of heating operation without causing an occupant to feel uncomfortable and automatically dealing with clouding of the windshield. The purpose is to provide an air conditioner for air conditioning.

[0005]

To achieve the above object, in the present invention, a heater core in which engine cooling water flows inside heats the inside air or the outside air and switches the air blowing mode so that a predetermined air outlet is opened. In a vehicle air conditioner configured to blow air through the inside of a vehicle, a dew condensation sensor that is disposed on the inner surface of a windshield and detects the cloudiness of the windshield, and the temperature of engine cooling water that flows inside the heater core are detected. A water temperature sensor and a blower mode switching means for selecting a blower mode in accordance with the presence or absence of a dew condensation signal from the dew condensation sensor and how the temperature detected by the water temperature sensor rises.

When the temperature detected by the water temperature sensor is lower than the set temperature, the air blow mode switching means selects the DEF mode in which the air blow mode is sent directly to the windshield, and the detected temperature is higher than the set temperature. When there is a dew condensation signal from the dew condensation sensor, the H / D mode that blows air directly to the windshield and at the foot is selected, while when there is no dew condensation signal from the dew condensation sensor, the HEAT mode that blows to the foot is selected. It is preferable to select it.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a vehicle air conditioner according to this embodiment.
A blower 2, an evaporator 3, a mix damper 4, and a heater core 5 are arranged in this order from the upstream side in a unit 1 provided in the front portion on the inside of the vehicle. The most downstream part of the unit 1 is a blower unit 1a, which has a DEF blower 6, a HEAT blower 7, and a VENT blower 8, and each blower 6, 7, 8 is opened and closed by a damper 9, 10, 11. (The outlet is not shown.) As a result, a predetermined air blowing mode, specifically, DEF mode, HEAT mode, H
The / D mode (the HEAT blower opening 7 and the DEF blower opening 6 are half opened), and the VENT mode is selected. In the DEF mode, the air is blown directly to the windshield 17, in the HEAT mode it is blown to the feet of the occupant, in the H / D mode it is blown to both, and in the VENT mode it is blown directly to the upper body of the occupant. It has become so.

The evaporator 3 is arranged in the middle of the refrigeration cycle. In the refrigeration cycle, a compressor 12, a condenser 13, an expansion valve 14 and the like are provided outside the evaporator 3. Then, the refrigerant that has been brought into a high-temperature and high-pressure state by driving the compressor 12 is radiated by the condenser 13, flows into the evaporator 3 through the expansion valve 14 and is vaporized, and thus passes through the outside of the evaporator 3 (in the unit 1). Air (inside air or outside air)
Dehumidify and cool.

The mix damper 4 is an evaporator 3.
The dehumidified and cooled air is diverted. The split flow rate is determined by the opening degree.

The heater core 5 is disposed in one of the flow paths divided by the mix damper 4, and heats air passing therethrough as engine cooling water flows therein. A water temperature sensor 15 is provided in the pipe a on the inflow side of the engine cooling water connected to the heater core 5. The water temperature sensor 15 detects the temperature of the engine cooling water and outputs the detected temperature to the blower mode switching device 16.

In addition to the temperature detected by the water temperature sensor 15, detection signals from the dew condensation sensor 18 provided on the inner surface of the windshield 17 are input to the blower mode switching device 16, and heating operation is performed based on these input signals. The drive control of each of the dampers 9, 10 and 11 immediately after the start is performed. Hereinafter, the dampers 9 and 1 immediately after the heating operation is started by the blower mode switching device 16
The drive control of 0 and 11 will be described with reference to the flowchart of FIG.

First, in step S1, it is determined whether the engine cooling water temperature T _w detected by the water temperature sensor 15 is lower than a set temperature T _k (for example, 80 ° C.).

When T _w <T _k is satisfied, for example, in winter,
If the engine cooling water temperature T _w is lowered by parking outdoors for a long time, the DE is determined in step S2.
Select F mode. That is, if the HEAT mode is selected and the heating of the inside of the vehicle is started, the cold air is directly supplied to the feet of the occupant, and the occupant feels discomfort. Therefore, by selecting the DEF mode, the cold air is directly supplied to the windshield 17 and the deterioration of the air conditioning state immediately after the start of the heating operation due to the blowing in the HEAT mode is prevented.

If T _w <T _k is not satisfied, for example, if the engine cooling water temperature T _w has not dropped so much due to short parking time even immediately after the heating operation is started, the windshield is determined in step S3. It is determined whether or not dew condensation is occurring on 17. The presence or absence of dew condensation is determined by the presence or absence of a dew condensation signal from the dew condensation sensor 18.

If a dew condensation signal is input from the dew condensation sensor 18, the H / D mode is selected in step S4, and air is blown to both the foot of the occupant and the windshield 17. This allows
At the same time as supplying warm air to the feet of the occupant, it becomes possible to remove the fog on the windshield 17 and secure the visibility.

If no condensation signal is input from the condensation sensor 18, the HEAT mode is selected in step S5,
By supplying warm air to the feet of the occupant, it is possible to obtain a desired air conditioning condition for the occupant.

Then, in step S3, the dew condensation sensor 18
The H / D mode or the HEAT mode is selected based on the presence / absence of the dew condensation signal input from, and if the fog on the windshield 17 is removed with the H / D mode selected, the mode is switched to the HEAT mode and vice versa. , If the windshield 17 becomes cloudy with the HEAT mode selected, the mode is switched to the H / D mode.

As described above, according to the above-mentioned embodiment, when the engine cooling water temperature T _w is lower than the set temperature T _k in the selection of the air blowing mode immediately after the start of the heating operation, the DEF mode is selected, so that the occupant is informed. Since the cold air is not blown directly toward the passengers, the occupant will not feel any discomfort. In this case, even if the windshield 17 is fogged, the fog is effectively removed by selecting the DEF mode.

Further, even if the engine cooling water temperature T _w becomes _{equal to} or higher than the set temperature T _k , the H / D mode is selected if the windshield 17 is fogged by the dew condensation sensor 18. It is possible to obtain a favorable air-conditioning condition for the occupant and effectively remove the fogging generated on the windshield 17.

[0021]

As is apparent from the above description, according to the present invention, the blowing mode is selected according to the temperature of the engine cooling water and the fog condition of the windshield immediately after the start of the heating operation. It is possible to blow air in a preferable blowing mode that does not cause discomfort, and it is possible to effectively remove fogging generated on the windshield.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a vehicle air conditioner according to an embodiment.

FIG. 2 is a flowchart showing a blowing mode selection according to the present embodiment.

[Explanation of symbols]

 15 Water Temperature Sensor 16 Blower Mode Switching Device (Blower Mode Switching Means) 17 Windshield 18 Condensation Sensor

Claims (2)

[Claims] 1. A vehicle air conditioner in which inside air or outside air is heated by a heater core through which engine cooling water flows, and a blowing mode is switched to blow air inside a vehicle through a predetermined blowing port. A dew condensation sensor that is disposed on the inner surface of the windshield to detect the cloudiness of the windshield; a water temperature sensor that detects the temperature of engine cooling water flowing inside the heater core; An air conditioner for a vehicle, comprising: a blower mode switching unit that selects a blower mode according to a degree of increase in temperature detected by a water temperature sensor. 2. When the temperature detected by the water temperature sensor is lower than a set temperature, the air blowing mode switching means selects a DEF mode in which the air blowing mode is directly blown to the windshield, and the detected temperature is lower than the set temperature. When the condensation signal from the condensation sensor is high, the air is blown directly to the windshield and the H / D mode is selected to blow air to the feet, while when there is no condensation signal from the condensation sensor, the air is blown to the feet. The vehicle air conditioner according to claim 1, wherein a mode is selected.