JP2002293123A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent unnatural feeling from being imparted to an occupant and to prevent a control from being adversely affected by suppressing influence on blowoff air quantity by traveling wind pressure in an air conditioner. SOLUTION: In this air conditioner provided with an intake door 16 capable of forming an outside air introduction mode and an inside air introduction mode by being operated in a direction for closing an inside air intake port 11b and in a direction for closing an outside air intake port 11a by an actuator and a controller 2 for executing an automatic control to control blowoff air quantity and a blowoff temperature by detecting environmental factors related to temperatures including a set temperature, the controller 2 performs control corresponding to traveling wind pressure for operating the intake door 16 in the direction for closing the outside air intake port 11a when ram pressure air quantity exceeds prescribed quantity set corresponding to the present control air quantity when forming the outside air introduction mode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for controlling a blown air volume and a blown air temperature by detecting a set temperature based on an occupant's operation and an environmental factor related to a vehicle temperature.

[0002]

2. Description of the Related Art Conventionally, a set temperature based on an occupant's operation,
For example, there is known an air conditioner called an auto air conditioner that detects an environmental factor related to a temperature such as a vehicle interior temperature, a vehicle exterior temperature, and an amount of solar radiation, and automatically determines a blowing air volume and a blowing temperature. Further, in such a conventional air conditioner, an inside air intake for taking in the vehicle interior air and an outside air intake for taking in the outside air are provided, and an intake door is provided between both intakes, It is configured to be switchable between an outside air introduction mode in which the inside air intake is closed and an inside air circulation mode in which the outside air intake is closed, or it is possible to form a mode for mixing inside air and outside air in addition to such switching. Some were configured to be possible.

[0003]

When a vehicle travels, traveling wind pressure is generated. Therefore, when the intake door is in the outside air introduction mode, when the traveling wind pressure increases, especially in a vehicle that is easily affected by the traveling wind pressure, the amount of outside air introduced from the outside air intake increases, and the air blown out from the air conditioner. Is different from the controlled air volume. Therefore, in such a case, there arises a problem that the blown air amount controlled by the air conditioner and the actual blown air amount are different, giving an uncomfortable feeling to the occupant. In particular, when the blowing air volume is displayed in the automatic control, if the total blowing air volume becomes one level higher than the displayed air volume due to an increase in the air volume due to the traveling wind pressure, a great sense of incongruity is given. In addition, the air conditioner controls the temperature of the passenger compartment and the like based on the temperature and the air volume. However, if the actual air volume is different from the control air volume as described above, the control is not performed smoothly. Control hunting may occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems. In an air conditioner, it is possible to suppress the influence of the traveling wind pressure on the amount of air blown out.
An object of the present invention is to prevent a passenger from feeling uncomfortable and not to adversely affect control.

[0005]

In order to achieve the above-mentioned object, the present invention provides an external air introduction mode and an internal air introduction mode which are operated by an actuator in a direction of closing an inside air intake and a direction of closing an outside air intake. In an air conditioner provided with a formable intake door and provided with a controller for executing an automatic control for controlling the blowout air volume and the blowout temperature by detecting an environmental factor related to the temperature including the set temperature, the outside air is introduced by a running wind pressure. Ram pressure air volume detection means for detecting a ram pressure air volume which is an amount of air blown by the controller, wherein the controller is configured to control the ram pressure air volume by the controller when the outside air introduction mode is formed. When a predetermined amount set in accordance with the air flow is exceeded, a traveling wind pressure corresponding control for operating the intake door in a direction to close the outside air intake is executed. And a means which is characterized and.

According to a second aspect of the present invention, in the air conditioner according to the first aspect, an air volume setting switch is provided for setting the amount of air to be blown out in steps by an occupant, and the air volume setting switch is set in accordance with the control air volume. Quantitation is the currently set airflow volume,
It is characterized in that it is an amount corresponding to the difference between the blown air amount and the air amount one step higher.

According to a third aspect of the present invention, there is provided the air conditioner according to the first or second aspect, wherein the ram pressure air volume detecting means is means for calculating a ram pressure air volume based on the vehicle speed detected by the vehicle speed detecting means. Features.

[0008]

According to the present invention, when the outside air intake mode is established with the outside air intake opening, the ram pressure air volume detected by the ram pressure air volume detection means is set in accordance with the current control air volume. When the amount exceeds the fixed amount, the running wind pressure corresponding control for operating the intake door in a direction to close the outside air intake is executed. Therefore, an increase in the amount of blown air in the air conditioner due to the influence of the running wind pressure is suppressed, and it is possible to prevent the occupant from feeling uncomfortable with the amount of blown air. In addition, since the actual blown air amount is different from the control air amount, the effect that control hunting is suppressed and control accuracy can be improved can be obtained.

According to the second aspect of the present invention, the ram pressure air volume is determined based on the currently set blowing air volume and the blowing air volume.
When it becomes the amount corresponding to the difference with the air volume one step higher,
Since the running wind pressure corresponding control is executed, it is possible to prevent the actual blowing air volume from increasing by one step with respect to the currently set blowing air volume due to the influence of the running wind pressure. Control can be performed.

According to the third aspect of the present invention, since the ram pressure air volume detecting means is a means for obtaining the ram pressure air volume based on the vehicle speed detected by the vehicle speed detecting device, a sensor or the like for actually detecting the wind pressure may be added. In addition, the ram pressure air volume can be detected by an existing sensor, and the configuration can be reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a configuration explanatory view schematically showing an air conditioning unit 1 in an air conditioner according to Embodiment 1 of the present invention. The air conditioning unit 1 includes a blower unit 11 and an air mixing unit 12 in order from the upstream side, and a foot duct 13, a defroster duct 14, and a vent duct 15 are connected downstream of the air mixing unit 12.

The blower unit 11 has an open air inlet 11a at the upper end, and an inner air inlet 1a on the left and right below the open air inlet 11a.
1b is open. The outside air inlet 11a
Is opened in an air box (not shown) that communicates with the outside of the car,
The inside air inlet 11b is open toward the passenger compartment. In addition, a pair of intake doors 16 are provided at the end of the outside air intake 11a to close the outside air intake 11a and open the inside air intake 11b, and conversely, close the inside air intake 11b. It is configured such that an outside air introduction mode in which the outside air intake 11a is opened can be formed. Note that each intake door 16 is rotated by an intake door actuator 17 (see FIG. 2) such as a motor. A filter 11f for filtering dust and the like is provided below both intake ports 11a and 11b, and a fan motor 11
g is provided. The fan motor 11g sucks air into the blower unit 11 from one or both of the inlets 11a and 11b and blows the air to the air mix unit 12.

The air mix unit 12 is provided with an evaporator 12a for cooling air with a cooling medium at the most upstream position, and a heater core 12b for heating air with heat of high-temperature engine cooling water downstream of the evaporator 12a.
b, and an air mixing door 12c for adjusting the amount of air passing through the air mixing door 12c, and adjusting the ratio of the amount of air passing through the evaporator 12a and the amount of air passing through the heater core 12b according to the opening of the air mixing door 12c. The temperature can be adjusted arbitrarily.

A vent door 18 and a differential door 19 are provided downstream of the air mixing unit 12. By switching the opening of these doors 18, 19, the blowing mode is switched, and the air passing through the air mixing unit 12 is switched. However, at the tip of each of the ducts 13, 14, and 15, it is possible to select which of the outlets provided in the vehicle compartment (not shown) to blow out. Each door 1
Reference numerals 8 and 19 denote a vent door actuator 18a such as a motor and a solenoid, and a differential door actuator 1 respectively.
9a (see FIG. 2).

The fan motor 11g, intake door actuator 17, vent door actuator 18
a, The drive of the differential door actuator 19a is controlled by the controller 2. FIG. 2 is a block diagram showing the controller 2 and the like. The controller 2 includes an outside temperature sensor, a solar radiation sensor, an inside temperature sensor, and the like as means for detecting an environmental factor related to a temperature including a set temperature on an input side. A sensor group 31, an operation switch group 32 provided on an instrument panel in a vehicle compartment and including an air volume setting switch and a temperature setting switch, and a vehicle speed sensor 33 for detecting a vehicle speed are provided. Controller 2
Is internally provided with a first AD conversion circuit 21 for AD-converting the signals of the sensor group 31 and the operation switch group 32 and a second AD conversion circuit 22 for AD-converting the signal of the vehicle speed sensor 33.
A target air volume calculation circuit 23 that calculates a target air volume that is an optimum air volume based on the input; an intake door opening calculation circuit 24 that calculates an optimal opening of the intake door 16 based on the input; A blow mode calculation circuit 25 that calculates an optimum blow mode, a ram pressure air flow calculation circuit 26 that calculates a ram pressure air flow that is an air flow based on a traveling wind pressure based on a vehicle speed, and an air flow comparison that compares a ram pressure air flow with a target air flow. An arithmetic circuit 27, an intake door opening correction arithmetic circuit 28 for calculating the opening correction amount of the intake door 16 based on the comparison value, and a drive for driving the fan motor 11g according to the arithmetic result of the target air volume arithmetic circuit 23 Circuit 29m
And a drive circuit 29i for driving the intake door actuator 17 based on the opening correction amount, and a drive circuit 29v for driving the vent door actuator 18a and the differential door actuator 19a according to the blowing mode.

Next, the correction of the opening of the intake door 16 by the controller 2, that is, the control corresponding to the traveling wind pressure will be described with reference to the flowchart of FIG. Step 10
In step 1, the control air volume (fan speed), the opening degree of the intake door 16, the vehicle speed, and the blowing mode are read. In the following step 102, it is determined whether or not the blowout mode is a defroster mode in which defrosting is performed. Proceed to perform normal auto air conditioner control. On the other hand, when the mode is not the defroster mode, the steps subsequent to step 104 are executed to execute the traveling wind pressure corresponding control as necessary. In step 104, it is determined whether or not the intake door 16 is in the outside air introduction mode in which the outside air intake 11a is opened. If the outside air introduction mode is not set, the traveling wind pressure control is not necessary, and the process proceeds to step 103. On the other hand, in the case of the outside air introduction mode, the process proceeds to step 105, and the ram pressure air flow according to the traveling wind pressure is obtained from the current vehicle speed based on a map in which the vehicle speed and the ram pressure air flow are associated. here,
The ram pressure air volume increases in proportion to the vehicle speed, and the slope of the increasing line is determined by the vehicle.
h, the ram pressure air volume is Am ³ / min, and the vehicle speed is bkm
/ H, the ram pressure air volume is determined such that the ram pressure air volume is Bm ³ / min. Note that A, B, C, and D are fan air volumes set by the occupant in a stepwise manner, that is, A is the minimum air volume, B is the low air volume, C is the medium air volume, and D is the maximum air volume. The vehicle speeds a, b, c, and d, which are the air volumes, are obtained through experiments and the like. In the first embodiment, the fan motor 11g is steplessly controlled by the target air volume calculation circuit 23. Note that the vehicle speed sensor 33 and the part that executes step 105 correspond to a ram pressure air volume detecting means in the claims. In the following step 106, the relationship between the control airflow F and the ram pressure airflow for the fan motor 11g is determined, and the ram pressure airflow according to the current vehicle speed V is larger than the control airflow F or does not exceed a predetermined amount. If it is smaller in the range, the process proceeds to step 107, in which the running door pressure control for rotating the intake door 16 by a predetermined amount in the closing direction of the outside air intake 11a is executed.
If the ram pressure air volume according to the current vehicle speed V is smaller than the control air volume F by more than a predetermined amount, the routine proceeds to step 103, where normal automatic air conditioner control is executed. That is, when the ram pressure air volume is larger than the control air volume F controlled by the fan motor 11g or small within a range not exceeding a predetermined volume,
The total amount of air blown out is close to or more than twice the control air amount F, giving the occupants a sense of incongruity, and the amount of heat supplied to the cabin is significantly different from the amount of heat in the control. May occur. Therefore, in such a case, the intake door 16 is rotated in a direction to close the outside air inlet 11a, thereby reducing the amount of air introduced by the traveling wind pressure, thereby reducing the total amount of air from the air conditioner. Thus, it is possible to prevent the user from feeling uncomfortable as described above and to prevent the occurrence of control hunting. In the first embodiment, the amount of rotation in the closing direction at this time is such that the opening at that time is closed in half, but for example, it is fully closed or closed so as to reach a certain opening. Is also good.

When defrosting is performed in the defroster mode, the performance of defrosting is reduced by reducing the amount of outside air introduced. In addition, in the defroster mode, the wind direction of the windshield is reduced. Since the direction is not the direction of the occupant and the air volume tends to be large, the above-described traveling wind pressure corresponding control for reducing the outside air introduction amount is not executed. In addition, when the intake door 16 is in the inside air introduction state, the traveling wind pressure control is not executed since the intake door 16 is not affected by the traveling wind pressure.

(Embodiment 2) Next, Embodiment 2 will be described. The only difference between Embodiment 2 and Embodiment 1 is the control content of the control corresponding to the traveling wind pressure. The description of the configuration is omitted, and the control flow will be described based on the flowchart of FIG. In the control steps, the same steps as those of the first embodiment are denoted by the same step numbers, and description thereof is omitted.

In step 205 following step 104, a ram pressure air volume Q corresponding to the current vehicle speed V is calculated.
The vehicle speed sensor 33 and the portion that executes the process of step 205 correspond to a ram pressure air volume detecting unit in the claims. In the following step 206, it is determined whether or not the ram pressure air volume Q is equal to or more than a predetermined percentage of the current control air volume F, that is,
It is determined whether or not F × k ≦ Q, and in the case of YES, the process proceeds to step 107 to execute the traveling wind pressure corresponding control. In addition,
k is set to 100% or less. When the traveling wind pressure control is performed, the amount of change in the opening degree of the intake door 16 may be a constant value, or may be an amount corresponding to a value R obtained by R = Q−F × k. It may be changed. In this case, the larger the value of R, the larger the amount of change in the opening degree of the intake door 16.

Although the embodiment has been described with reference to the drawings, the present invention is not limited to this. For example, the configuration and shape of the air conditioning unit 1 are not limited to those described in the embodiment.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an air conditioner according to a first embodiment.

FIG. 2 is a block diagram showing a controller in the air conditioner according to the first embodiment.

FIG. 3 is a flowchart illustrating a control flow in the air conditioner according to the first embodiment.

FIG. 4 is a flowchart showing a control flow in the air conditioner according to the second embodiment.

[Explanation of symbols]

 Reference Signs List 1 air conditioning unit 11 blower unit 11a outside air intake 11b inside air intake 11f filter 11g fan motor 12 air mix unit 12a evaporator 12b heater core 12c air mix door 13 foot duct 14 defroster duct 15 vent duct 16 intake door 17 intake door actuator 18 vent door 18 Vent door actuator 19 Differential door 19a Differential door actuator 2 Controller 21 First AD conversion circuit 22 Second AD conversion circuit 23 Target air flow calculation circuit 24 Intake door opening calculation circuit 25 Blow mode calculation circuit 26 Ram pressure air flow calculation circuit 27 Air flow comparison calculation circuit 28 Intake door opening correction arithmetic circuit 29m drive circuit 29i drive circuit 29v drive circuit 31 sensor group 32 Work switch group 33 vehicle speed sensor

Claims (3)

[Claims] An intake door is provided which is actuated by an actuator in a direction to close an inside air intake and in a direction to close an outside air intake to form an outside air introduction mode and an inside air introduction mode. In an air conditioner equipped with a controller that executes automatic control for detecting the environmental factors to be performed and controlling the amount of blown air and the temperature of the blown air, the ram pressure that detects the amount of ram pressure that is the amount of blown air that is introduced by outside air by the running wind pressure The controller is provided with an air volume detection unit, wherein the controller is configured to, when the outside air introduction mode is formed, when the ram pressure air volume exceeds a predetermined volume set in accordance with the current control air volume controlled by the controller. An air conditioner, which executes a control corresponding to a traveling wind pressure for operating an intake door in a direction to close an outside air intake. 2. The air conditioner according to claim 1, further comprising: an air volume setting switch for setting an amount of air to be blown out in a stepwise manner by the occupant; The air conditioner is characterized in that the air flow is an amount corresponding to a difference between the blown air volume and the air volume one step higher than the blow air volume. 3. The air conditioner according to claim 1, wherein the ram pressure air amount detecting means is means for calculating a ram pressure air amount based on a vehicle speed detected by the vehicle speed detecting means.