JPH06239130A - Air-conditioner device for vehicle - Google Patents

Abstract

PURPOSE:To eliminate the unpleasant feeling by the variation of the air capacity, by suppressing the generation of the variation of air capacity generated by prohibiting the outside air introduction in the scope the numerical aperture is small side as low as possible, in order to prevent an air cutting sound, as well as to prevent the air cutting sound owing to a ram pressure and an outside air introduction. CONSTITUTION:The outside air introduction prohibiting means 20 of a control device 12 does not prohibit the outside air introduction in the scope the numerical aperture is small side when the car speed is less than 10km/h. When the car speed is in the scope 10 to 60km/h, the outside air introduction in the scope the numerical aperture is 0 to 10% is prohibited. When the car speed is 120km/h or higher, the outside air introduction in the scope the numerical aperture is 0 to 30% is prohibited. Consequently, the prohibition of the outside air introduction which generates no air cutting sound is released, the variation rate of the numerical aperture by prohibiting the outside air introduction is reduced, and the variation of the air capacity is reduced, when the car speed is low.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention can change the ratio of the air inside the vehicle (inside air) and the air outside the vehicle (outside air) introduced into the duct continuously or in multiple stages by the inside / outside air switching means. The present invention relates to a vehicle air conditioner.

[0002]

2. Description of the Related Art In recent years, for example, some automatic air conditioners automatically switch between the inside air and the outside air in accordance with the blowing temperature and the like. In this device, the ratio between the inside air and the outside air is changed continuously or in multiple stages in order to eliminate the feeling of strangeness in the change in the air flow that occurs when the inside air and the outside air are switched. on the other hand,
In a vehicle that changes the ratio of inside air to outside air continuously or in multiple steps, when running at high speed with a small opening ratio of the outside air inlet, wind noise is generated by the ram pressure generated by the running of the vehicle. I will end up. Therefore, conventionally, outside air introduction is always prohibited when the opening ratio of the outside air inlet is less than 30% so that no wind noise is generated even when the vehicle traveling speed is 180 km / h.

[0003]

However, in the prior art,
For example, the opening ratio of the outside air inlet switches between 0% and 30% even during low-speed running or normal running with less wind noise, which causes a large change in the air volume and causes discomfort to passengers. Had a problem giving.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle air conditioner that prevents wind noise due to ram pressure and eliminates discomfort due to changes in air volume.

[0005]

The vehicle air conditioner of the present invention employs the following technical means. The vehicle air conditioner includes a duct for sending air into the passenger compartment, a blower for generating an air flow toward the passenger compartment in the duct, an inside air introduction port for guiding the passenger compartment air into the duct, and an outside air for the passenger compartment. Inside / outside air having an outside air introduction port that leads into the duct, and adjusting the ratio of vehicle interior air introduced into the duct from the inside air introduction port and vehicle exterior air introduced into the duct from the outside air introduction port An inside / outside air switching unit having a switching damper, an actuator for driving the inside / outside air switching damper, and a controller for controlling the actuator are provided. The control device includes an outside air introduction prohibiting unit that prohibits the introduction of outside air having a small opening ratio and increases the inhibition opening ratio as the ram pressure applied to the outside air introduction port increases.

[0006]

When the ram pressure applied to the outside air introduction port is large, the opening ratio of the outside air introduction port where the wind noise is generated occurs in a wide range on the side where the opening ratio is small. Then, the control device
When the ram pressure applied to the outside air introduction port is large, the opening ratio for prohibiting outside air introduction is increased. As a result, the introduction of outside air at the opening ratio at which wind noise is generated is prohibited, and the generation of wind noise is prevented. When the ram pressure applied to the outside air introduction port is small, the opening ratio of the outside air introduction port where wind noise is generated occurs only in a narrow range on the side where the opening ratio is small. Then, when the ram pressure applied to the outside air introduction port is small, the control device reduces the opening ratio for prohibiting the outside air introduction. As a result, the introduction of outside air at the opening ratio at which the wind noise is generated is prohibited, the generation of wind noise is prevented, and the change rate of the opening ratio at the outside air introduction is smaller than that when the ram pressure is high. Therefore, it is possible to suppress a change in the air volume when the outside air introduction port is opened or closed.

[0007]

As described above, the vehicular air conditioner of the present invention reduces the change in air volume when the ram pressure applied to the outside air inlet is small, or when the outside air inlet is opened or closed. Since it can be suppressed, discomfort to the occupant can be reduced as compared with the related art.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a vehicle air conditioner of the present invention will be described based on an embodiment shown in the drawings. [Structure of Embodiment] FIGS. 1 to 6 show an embodiment of the present invention, and FIG. 1 shows a schematic view of a vehicle air conditioner.
The vehicle air conditioner 1 includes a duct 2 that sends air toward the vehicle interior. A blower 4 having an inside / outside air switching means 3 is connected to one end of the duct 2. The inside / outside air switching means 3 communicates with the passenger compartment and introduces the inside air into the duct 2 via the blower 4, and the inside air introduction port 5 communicates with the outside of the passenger compartment into the duct 2 via the blower 4. The external air introduction port 6 for introducing is provided. Then, the inside / outside air switching means 3 is connected to the inside air introduced into the duct 2 through the inside air inlet 5,
An inside / outside air switching damper 7 for adjusting the ratio of the outside air introduced into the duct 2 from the outside air introduction port 6 is provided. The inside / outside air switching damper 7 is driven by a servomotor 8 (actuator of the present invention) with a potentiometer,
The ratio of the inside air introduced through the inside air introduction port 5 and the outside air introduced through the outside air introduction port 6 is adjusted.

The blower 4 includes a fan case 9 and a fan 1.
0, a motor 11. The motor 11 rotationally drives the fan 10 according to the applied voltage, and sends the air guided from the inside / outside air switching means 3 into the fan case 9 into the vehicle interior through the duct 2. Inside the duct 2, cooling means (not shown) and heating means (not shown) are provided from upstream to downstream. The cooling means is, for example, a refrigerant evaporator of a refrigeration cycle and cools the air passing through the duct 2. The heating means is, for example, a heater core that uses engine cooling water as a heat source to heat the air passing through the duct 2. At the downstream end of the duct 2, a blowout port (for example, a defroster blowout port, a face blowout port, a foot blowout port) (not shown) that blows out the air passing through the duct 2 toward each part of the vehicle is provided.

A control device 12 controls the amount of adjustment of the inside air and the outside air by the blower 4 and the servo motor 8, the degree of cooling of the cooling means, the selection of the blowout mode of the outlet, and the like. The air conditioner 1 of the present embodiment is capable of automatically controlling the temperature inside the vehicle compartment to the user's set temperature by the auto air conditioner function, and the control device 12 controls various input signals and the input program based on various input signals. Controls various electrical parts to control the air conditioning. As the input signal of the control device 12, a temperature setter 13 operated by a user, an inside air temperature sensor 14 for detecting the inside air temperature, an outside air temperature sensor 15 for detecting the outside air temperature, a solar radiation sensor 16 for detecting the amount of solar radiation, and a cooling. Signals from a post-evaporation temperature sensor 17 that detects the temperature downstream of the means, a water temperature sensor 18 that detects the temperature of the cooling water supplied to the heating means, and a vehicle speed sensor 19 that detects the traveling speed of the vehicle are input. Then, the control device 12
When an auto air conditioner is selected by the user, the air temperature, the air flow rate, the air outlet, and the ratio of the inside air to the outside air are automatically adjusted so that the temperature inside the vehicle interior maintains the temperature set by the temperature setter 13. Control.

The control unit 12 controls the target air outlet temperature T blown out from the air outlet in order to perform the automatic air conditioner control.
AO is calculated, and based on this target outlet temperature TAO, the air volume,
Automatically control the air outlet and the ratio of inside air to outside air. This target outlet temperature TAO is calculated by the following equation.

[Equation 1] TAO = Kset-Tset-Kr-Tr-Kam-
Tam−Ks · Ts + C where Tset is the set temperature, Tr is the inside air temperature, Tam is the outside air temperature, and Ts is the amount of solar radiation. Also, Kset, Kr, Ka
m and Ks are coefficients, and C is a correction value. The voltage applied to the motor of the blower 4 is based on the solid line in FIG.
Determined based on O.

Further, the control device 12 is provided with an outside air introduction inhibiting means 20 for inhibiting introduction of outside air having a small opening ratio. The outside air introduction prohibiting means 20 is provided with the outside air introduction port 6
It is provided so as to change the prohibited aperture ratio according to the ram pressure applied to the. In this embodiment, the ram pressure is detected by the vehicle speed. When the vehicle speed is 0 to 10 km / h, the control device 12 of the present embodiment changes the target opening temperature TAO according to the solid line of FIG. When the vehicle speed is 10 to 60 km / h, the opening ratio of the outside air inlet 6 is determined based on
The open ratio of the outside air inlet 6 is determined based on the target outlet air temperature TAO according to the solid line of FIG. 4, and when the vehicle speed is 60 to 120 km / h, the outside air inlet 6 is opened based on the target outlet air temperature TAO according to the broken line of FIG. The opening rate of the vehicle is determined, and the vehicle speed is 120 km /
When h or more, the target outlet air temperature TAO follows the solid line in FIG.
The opening ratio of the outside air introduction port 6 is determined based on the above. That is, when the vehicle speed is 0 to 10 km / h,
The hysteresis that prohibits the introduction of outside air with a small opening ratio is shown in Fig. 3.
The vehicle speed is 10-60 km.
When the vehicle speed is 60 to 120 km / h, the hysteresis that prohibits the introduction of the outside air having a small opening rate is provided in the range of 0 to 10% when the vehicle speed is 60 to 120 km / h. As shown by the broken line in FIG. 4, the hysteresis that prohibits the introduction of outside air having a small value is provided in the range of 0 to 20%.
When the vehicle speed is 120 km / h or more, the hysteresis that prohibits the introduction of the outside air having a small opening ratio is provided in the range of 0 to 30% as shown by the solid line in FIG.

[Operation of Embodiment] Next, the operation control for changing the opening ratio of the outside air introduction port 6 according to the vehicle speed will be described with reference to the flowchart shown in FIG. First, when the automatic air conditioner is selected (start), various sensor inputs, set temperature, vehicle speed, etc. are read (step S1). Then, the target outlet temperature TAO is calculated based on the above equation 1 (step S2). Next, it is judged whether or not the vehicle speed is 10 km / h or less (step S3). Vehicle speed is 1
If it is 0 km / h or less, the opening ratio of the outside air inlet 6 is determined based on the target outlet temperature TAO according to the solid line in FIG. 3 (step S4). If the result of the determination in step S3 is that the vehicle speed is higher than 10 km / h, it is determined whether or not the vehicle speed is 60 km / h or less (step S5). Vehicle speed is 6
If it is 0 km / h or less, the opening ratio of the outside air inlet 6 is determined based on the target outlet temperature TAO according to the solid line in FIG. 4 (step S6). If the result of determination in step S5 is that the vehicle speed is faster than 60 km / h, it is determined whether or not the vehicle speed is 120 km / h or less (step S7). When the vehicle speed is 120 km / h or less, the opening ratio of the outside air inlet 6 is determined based on the target outlet temperature TAO according to the broken line in FIG. 4 (step S8). If the result of determination in step S5 is that the vehicle speed is faster than 120 km / h, the opening ratio of the outside air inlet 6 is determined based on the target outlet temperature TAO according to the solid line in FIG. 5 (step S9). After that, the opening degree of the inside / outside air switching damper 7 is driven using the servo motor 8 in accordance with the opening ratio of the outside air introduction port 6 determined based on the vehicle speed and the target outlet temperature TAO (step S10). In addition, the cooling means, the heating means, the control of the blowing mode, etc., are performed by the target blowing temperature T
Based on AO, it is performed by well-known automatic air conditioner control.

[Effects of the Embodiment] The vehicle air conditioner 1 of the present embodiment has, as shown in the above-described operation, as the vehicle speed increases, that is, as the ram pressure applied to the outside air inlet 6 increases. The wind noise is generated in a wide range on the side where the opening ratio of the outside air introduction port 6 is small. Then, the control device 12
Increases the hysteresis that prohibits the introduction of the outside air as the vehicle speed increases. As a result, the introduction of outside air is prohibited only by the opening ratio at which wind noise is generated, and the generation of wind noise is prevented. Further, since the introduction of outside air is prohibited only by the opening ratio at which wind noise is generated, unnecessary introduction of outside air is not prohibited. For this reason, when the vehicle speed is low, the rate of change in the opening ratio of the outside air introduction becomes small, so that it is possible to suppress the change in the air volume when the outside air introduction port 6 is opened or closed. As a result, it is possible to reduce the discomfort caused by the change in the air volume as compared with the conventional technique.

[Modification] In the above embodiment, an example in which the outside air introduction rate is changed by the automatic air conditioner control is shown. However, even when the occupant manually indicates the opening rate of the outside air introduction port, the outside air introduction rate is changed according to the ram pressure. Alternatively, the outside air introduction prohibited area may be changed. Although an example is shown in which the vehicle speed is divided into a plurality of ranges and the range in which the opening ratio of the outside air inlet is prohibited is set, the range in which the opening ratio of the outside air inlet is continuously prohibited is set according to the vehicle speed. good. Although the example in which the ram pressure is detected by the vehicle speed has been shown, the ram pressure may be actually measured and the range in which the opening ratio of the outside air introduction port is prohibited may be set according to the detected value. Although the example in which the hysteresis is provided is shown, the hysteresis may be eliminated.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a vehicle air conditioner.

FIG. 2 is a graph showing a relationship between a target outlet temperature TAO and a voltage applied to a blower.

FIG. 3 is a target outlet temperature T when the vehicle speed is 10 km / h or less.
It is a graph which shows the relationship between AO and the opening ratio of an external air inlet.

FIG. 4 is a graph showing the relationship between the target outlet temperature TAO and the open ratio of the outside air inlet when the vehicle speed is 10 to 120 km / h or less.

FIG. 5 is a graph showing the relationship between the target outlet temperature TAO and the open ratio of the outside air inlet when the vehicle speed is higher than 120 km / h.

FIG. 6 is a flowchart showing control of the opening ratio of the outside air inlet.

[Explanation of symbols]

 1 Vehicle Air Conditioner 2 Duct 3 Inside / Outside Air Switching Means 4 Blower 5 Inside Air Introduction Port 6 Outside Air Introduction Port 7 Inside / Outside Air Change Damper 8 Servo Motor (Actuator) 12 Controller 20 Outside Air Introduction Prohibition Means

Claims (1)

[Claims] 1. A duct for sending air into a passenger compartment, a blower for generating an air flow toward the passenger compartment in the duct, an inside air introduction port for guiding the passenger compartment air into the duct, and an air outside the passenger compartment in the duct. An inside / outside air switching damper that has an outside air introduction port leading to the inside of the duct and adjusts the ratio of the inside air introduced into the duct from the inside air introduction port to the outside air introduced into the duct from the outside air introduction port. In an air conditioner for a vehicle, which includes an inside / outside air switching unit, an actuator for driving the inside / outside air switching damper, and a controller for controlling the actuator, the controller is configured to introduce outside air having a small opening ratio. The vehicle air space is provided with an outside air introduction prohibiting means for prohibiting and increasing the prohibited opening ratio as the ram pressure applied to the outside air introduction port increases. Conditioning apparatus.