JP3467109B2 - Vehicle air conditioner - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle, and more particularly, to an air conditioner for a vehicle.
The present invention relates to a vehicle air conditioner that appropriately selects a blowing mode immediately after a heating operation is started. 2. Description of the Related Art Generally, in a vehicle air conditioner, engine cooling water is caused to flow in a heater core disposed in a unit in a front part of the vehicle, thereby heating air sucked into the unit and heating the vehicle. I do it. In such a vehicle air conditioner, in winter, when parked outdoors for a long time, etc., if the heating operation is started immediately after the start of the engine,
Since it takes some time until the temperature of the engine cooling water rises, 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 cold air does not directly hit the occupants, and H / D mode and HEAT mode. [0003] However, when fogging occurs on a window glass, particularly on a windshield, the fogging is removed simply by switching the air blowing mode based on the engine cooling water temperature. Mode is switched from the DEF mode to the H / D mode or the HEAT mode before the front view cannot be secured.
You have to re-select the mode, which is troublesome. On the other hand, it is desired to change the air blowing mode so that the occupant does not feel uncomfortable as much as possible. [0004] In view of the above problems, the present invention provides a vehicle in which the selection of a ventilation mode immediately after the start of heating operation does not cause discomfort to the occupant and can automatically cope with fogging of the windshield. It is an object to provide an air conditioner for use. [0005] In order to achieve the above object, the present invention heats the inside air or the outside air by a heater core in which the engine cooling water flows, and switches a blowing mode by a predetermined mode. In a vehicle air conditioner that blows air to the inside of a vehicle through a blower port, a dew condensation sensor that is disposed on an inner surface of a windshield and detects a cloudy state thereof, and a temperature of engine cooling water flowing inside the heater core If the temperature detected by the water temperature sensor and the temperature detected by the water temperature sensor is lower than a set temperature, a DEF mode in which air is blown directly to a windshield is selected as a blowing mode, and the detected temperature is higher than the set temperature and the dew condensation is performed. If there is a dew condensation signal from the sensor, while directing the wind to the windshield and selecting the H / D mode to blow to the feet,
And a blow mode switching means for selecting a HEAT mode for blowing to the feet when there is no dew signal from the dew sensor. An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an air conditioner for a vehicle according to this embodiment.
A blower 2, an evaporator 3, a mix damper 4, and a heater core 5 are sequentially arranged in the unit 1 provided in the front part inside the vehicle from the upstream side. The lowermost part of the unit 1 is a blower unit 1a, which has a DEF blower port 6, a HEAT blower port 7, and a VENT blower port 8, and the blower ports 6, 7, 8 are opened and closed by dampers 9, 10, 11 respectively. (The outlet is not shown.) Thereby, a predetermined air blowing mode, specifically, DEF mode, HEAT mode, H
/ D mode (HEAT air outlet 7 and DEF air outlet 6 are half open) and VENT mode are selected. In the DEF mode, air is blown directly to the windshield 17, in the HEAT mode, air is blown to the feet of the occupant, in the H / D mode, air is blown to both of them, and in the VENT mode, air is blown directly to the upper body of the occupant. It has become so. The evaporator 3 is provided in the middle of a refrigeration cycle. In the refrigeration cycle, in addition to the evaporator 3, a compressor 12, a condenser 13, an expansion valve 14, and the like are provided. Then, the refrigerant which has been brought into a high-temperature and high-pressure state by the driving of the compressor 12 is radiated by the condenser 13, flows into the evaporator 3 via the expansion valve 14, and evaporates, thereby passing outside the evaporator 3 (in the unit 1). Air (inside air or outside air)
Dehumidify and cool. [0010] The mixing damper 4 includes an evaporator 3.
To divide the dehumidified and cooled air. The ratio of the diversion is determined by the degree of opening. The heater core 5 is disposed in one of the flow paths divided by the mix damper 4, and heats the air passing therethrough by the flow of engine cooling water. 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 ventilation mode switching device 16. In addition to the temperature detected by the water temperature sensor 15, a detection signal from a dew condensation sensor 18 provided on the inner surface of the windshield 17 is input to the blow mode switching device 16, and the heating operation is performed based on these input signals. Drive control of the dampers 9, 10, 11 immediately after the start is performed. Hereinafter, the dampers 9.1 and 1 immediately after the start of the heating operation by the ventilation mode switching device 16 will be described.
The drive control of 0 and 11 will be described with reference to the flowchart of FIG. [0013] First, in step S1, the engine coolant temperature T _w which is detected by the water temperature sensor 15 is the set temperature T _k (e.g., 80 ° C.) to determine a lower or not than. When T _w <T _k is satisfied, for example, in winter,
If the engine cooling water temperature _Tw has dropped due to parking outdoors for a long time, the DE is determined in step S2.
Select F mode. That is, if the HEAT mode is selected to start heating the inside of the vehicle, the cool air is directly supplied to the feet of the occupant, and this occupant will feel uncomfortable. Therefore, by selecting the DEF mode, the cool air is directly supplied to the windshield 17 to prevent the deterioration of the air-conditioning state immediately after the start of the heating operation due to the blowing in the HEAT mode. [0015] In addition, if you do not satisfy the T _w <T _k, for example, when the heating operation even immediately after start-up, engine cooling water temperature T _w by the parking time is short and the like is not so down, the front glass in step S3 It is determined whether or not dew condensation has occurred at 17. The determination of the presence or absence of condensation is made based on the presence or absence of a condensation signal from the condensation sensor 18. When a dew signal is input from the dew sensor 18, the H / D mode is selected in step S4, and air is blown to both the feet of the occupant and the windshield 17. This allows
At the same time as supplying warm air to the feet of the occupant, it is possible to remove the fogging of the windshield 17 and secure a view. 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, a desired air-conditioning state for the occupant can be obtained. Thereafter, in step S3, the condensation sensor 18
The H / D mode or the HEAT mode is selected based on the presence or absence of a dew signal input from the camera. If the fogging of the windshield 17 is removed while the H / D mode is selected, the mode is switched to the HEAT mode. If the windshield 17 becomes fogged while the HEAT mode is selected, the mode is switched to the H / D mode. [0019] Thus, according to the embodiment, in the selection of the blowing mode immediately after heating operation starts, by the engine coolant temperature T _w selects the DEF mode is lower than the set temperature T _k, the passenger Since the cold air is not blown directly toward the passenger, the occupants do not feel discomfort. In this case, even if the front glass 17 is fogged, the fogging is effectively removed by selecting the DEF mode. Even if the engine cooling water temperature _Tw is _{equal to} or higher than the set temperature Tk, the H / D mode is selected if the dew condensation sensor 18 has formed fogging on the windshield 17. A favorable air-conditioning state for the occupant can be obtained, and fogging generated on the windshield 17 can be effectively removed. As is apparent from the above description, according to the present invention, immediately after the heating operation is started, the air blowing mode is selected according to the engine cooling water temperature and the fogging state of the windshield. In addition, it is possible to blow air in a preferable blowing mode in which the occupant does not feel uncomfortable, and it is possible to effectively remove the fogging generated on the windshield.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a vehicle air conditioner according to an embodiment. FIG. 2 is a flowchart illustrating a blow mode selection according to the embodiment. [Description of Signs] 15 Water temperature sensor 16 Ventilation mode switching device (Ventilation mode switching means) 17 Windshield 18 Dew condensation sensor

Continuation of the front page (56) References JP-A-6-135218 (JP, A) JP-A-4-356257 (JP, A) Japanese Utility Model Showa 62-127018 (JP, U) (58) Fields investigated (Int) .Cl. ⁷ , DB name) B60H 1/00-3/06

Claims (1)

(57) [Claims 1] Heating the inside air or the outside air by a heater core in which engine cooling water flows inside and switching the air blowing mode to blow air inside the vehicle through a predetermined air blowing port. A dew condensation sensor disposed on an inner surface of a windshield and detecting a fogging state; a water temperature sensor for detecting a temperature of engine cooling water flowing inside the heater core; and the water temperature. When the temperature detected by the sensor is lower than the set temperature, the air blow mode is set to blow air directly to the windshield.
When the F mode is selected and the detected temperature is higher than the set temperature and there is a dew signal from the dew sensor, H / D is blown directly to the windshield and blown to the feet
An air conditioner for a vehicle, comprising: a blow mode switching unit that selects a HEAT mode in which a foot is blown to a foot when a dew signal is not received from the dew sensor while selecting a mode.