JPS6233603Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vehicle air conditioner, and particularly to a vehicle air conditioner that automatically adjusts the temperature inside a vehicle to a set temperature.

For example, air conditioners installed in automobiles, etc.
It has a structure that allows it to be used in heat mode, ventilator mode, and defroster mode. And, in such an air conditioner,
A heater outlet is installed below the instrument panel in a car and blows air out toward the feet of the occupants seated in the seat.In most cases, the heater outlet is installed at the front of the instrument panel and blows air out toward the feet of the occupants seated. A vent outlet that blows air toward the front window, and a defroster outlet that is installed above the instrument panel and blows air toward the front window are provided. Air controlled to a predetermined temperature according to a set mode is blown out from the air outlet into the vehicle interior by rotation of the fan.

When this air conditioner is set to heat mode and set to control the temperature inside the car to the set value t _SEt , the air conditioner detects the temperature outside the car, the temperature inside the car, and the amount of solar radiation using sensors, and based on these detected values. The temperature of air blown into the vehicle interior is automatically calculated and controlled. Then, a fan is driven at a rotational speed set in accordance with the blowout temperature to blow this air, which is controlled to a predetermined blowout temperature, into the passenger compartment from the heat outlet or the vent outlet, thereby bringing the temperature inside the vehicle to the set value t _SEt. Control automatically.

By the way, even when this air conditioner is set to the heat mode, in order to prevent the front window from fogging up, a portion of the air, which is controlled to a predetermined blowing temperature as described above, is blown out from the defroster outlet by driving the fan. . However, in the conventional device, the rotation speed of the fan is determined by the set temperature t _SE
Since _it is uniquely determined based on the blowout temperature which is calculated and controlled in response to The problem was that it became cloudy.

The present invention was developed in view of these conventional problems, and its purpose is to set the temperature inside the vehicle when the air conditioner is set to heat mode, which controls the temperature inside the vehicle to a predetermined set value. It is an object of the present invention to provide an air conditioner for a vehicle, which not only automatically controls the air conditioner to the desired value, but also can reliably defog the windows of the vehicle, such as the front window.

In order to achieve the above object, the device of the present invention calculates and controls the temperature at which air is blown into the vehicle interior to a predetermined value based on the temperature outside the vehicle, the temperature inside the vehicle, and the amount of solar radiation. In a vehicle air conditioning system, a fan is driven by a number of units to blow air into a vehicle interior to control the vehicle interior temperature to a set temperature, and also to defog a window using the air blowout. The fan rotation speed necessary for defogging the window is calculated based on a humidity sensor provided nearby, the temperature outside the car, the temperature inside the car, and the humidity obtained from the humidity sensor, and the number of revolutions of the fan required for defogging the window is calculated based on the calculated value and the air blowing temperature. A control device that compares a set fan rotation speed and drives the fan at the higher rotation speed;
It is characterized by having the following.

Next, a preferred embodiment of the vehicle air conditioner of the present invention will be described based on the drawings.

FIG. 1 is an explanatory diagram of an air conditioner according to the present invention. The air conditioner shown in FIG. 1 is installed in an automobile, and a ventilation duct 10 has an outside air intake port 12 that takes in air from outside the vehicle and an inside air intake port 14 that takes in air from inside the vehicle. 16
can be selectively switched. Immediately after the suction ports 12 and 14 in this ventilation duct 10, the air taken in from these suction ports 12 and 14 is sent to the heater outlet 18, vent outlet 20, and defroster outlet 22 downstream of the ventilation duct 10. A fan 24 is provided to blow air toward the
4 is rotationally driven by a fan motor 26.

An evaporator 28, which is a cooling heat exchanger, is provided downstream of the air flow of the fan 24, and forms a refrigeration cycle together with a compressor, a condenser, etc. (not shown). The evaporator 28 is provided over the entire cross section of the ventilation duct 10 so that all the air flowing through the ventilation duct 10 on the downstream side of the fan 24 crosses the evaporator 28.

Further, an air mix type temperature control mechanism 30 is provided in the ventilation duct 10 located downstream from the location where the evaporator 28 is disposed. This temperature control mechanism 30 includes an air mix damper 32 that divides the air flow flowing through the ventilation duct 10 on the downstream side of the evaporator 28 into two, and a heating heat exchanger that heats one of the divided air flows. It consists of a heater core 34 which is a container. The airflow flowing through the duct 10 from upstream is divided by the air mix damper 32 into a first airflow that is heated by the heater core 34 and a second airflow that bypasses the heater core 34. , the first and second air flows rejoin downstream of the temperature adjustment mechanism 30. As a result, the air outlet 18, 20, 2
The blowing temperature of the air blown out from 2 is adjusted.
In other words, this blowing temperature is controlled by adjusting the distribution ratio of the first and second air flows based on the opening degree of the damper 32. For example, if the damper 32 is located at the solid line position as shown in the figure, all of the airflow will be heated by the heater core 34, resulting in a high blowout temperature, and if the damper 32 is located at the position shown by the imaginary line, all of the airflow will be heated by the heater core 34. 34 is bypassed, the blowing temperature becomes lower. 36 is an air mix damper actuator that adjusts the opening degree of this damper 32. Note that cooling water for an engine (not shown) is supplied to the heater core 34 in a circulating manner.

Further, in the ventilation duct 10 located downstream of the temperature adjustment mechanism 30, that is, at the most downstream position of the ventilation duct 10, a heater outlet 18, a vent outlet 20, and a defroster outlet 18 for blowing air into the vehicle interior are provided. The outlet 22 is open. Heater outlet 1
8 is often provided below the instrument panel of an automobile and has a structure that blows air toward the feet of a seated passenger. Further, the vent outlet 20 is often provided on the front surface of an instrument panel and has a structure that blows air toward the upper body of a seated passenger.
In the embodiment, the heater outlet 18 and the vent outlet 20 are selectively opened and closed by one switching damper 38.

Further, the defroster outlet 22 is provided above the instrument panel so as to open toward the front window 40 in order to blow out air toward the front window 40 and ensure fog prevention. This defroster outlet 22 is connected to a damper 42.
It can be selectively opened/closed or partially opened.

Note that each of these dampers 38 and 42 is driven by actuators 44 and 46.

50 is a microcomputer as a control device for controlling the air conditioner described in detail above, and an actuator 36 that drives each damper 32, 38, 42 according to instructions from a temperature setting device 52 provided on an operation panel in the vehicle interior. , 44, 46 and a fan speed drive device 54 that controls the fan motor 26. Note that in order to perform control by the microcomputer 50, data for various calculation processes are required. For this reason, each part of the automobile is equipped with an outside air sensor 56 that detects the outside air temperature, and an inside air sensor 5 that detects the inside temperature of the car.
8. Solar radiation sensor 60 that detects the amount of solar radiation into the vehicle interior
A humidity sensor 62 is provided near the windshield to detect the humidity near the windshield, and each of these sensors 56, 58,
Detection data 60 and 62 are input to the microcomputer 50.

In this embodiment, when the air conditioner is set to heat mode and the vehicle interior temperature is set to t _SEt by operating the temperature setting device 52, the microcomputer 50 calculates the air blowing temperature T _A according to the following equation, and The actuator 36 is driven to control the opening degree of the air mix damper 32 so that the temperature of the air blown out matches the calculated value _TA .

T _A = k ₁ t _SEt −k ₂ t _p −k ₃ t _r −k ₄ ST+C (1) Here, t _p is the temperature outside the vehicle detected by the outside air sensor 56, and t _r is the temperature detected by the inside air sensor 58. ST is the amount of solar radiation detected by the solar radiation sensor 60, and k ₁ , k ₂ , k ₃ , k ₄ , and C are constants.

In this way, the microcomputer 50 calculates the calculated value _T
Then, the optimal fan speed corresponding to this calculated value T _A is calculated, and a signal based on the result is output to the fan speed control device 54 . The fan speed control device 54 is composed of a well-known device such as a variable resistance device or a pulse speed control device, and is configured to control a fan motor so that the fan 24 is rotated at an optimum blowing fan speed based on a signal inputted from the microcomputer 50. 26.

FIG. 2 is a diagram showing the relationship between the blowout temperature T _A described above and the fan motor voltage V ₁ that provides the optimum fan speed corresponding to this blowout temperature, and the relationship is expressed by the following equation.

V ₁ =F( _TA )...(2) Here, F(x) represents a function.

Incidentally, even when the air conditioner is set to the heat mode, a portion of the air controlled to a predetermined blowout temperature T _A is sent to the defroster by adjusting the opening degree of the damper 42 to ensure that the front window 40 is not fogged. Air is blown out from the air outlet 22 toward the front window 40.

A feature of the air conditioner according to the present invention is that when set to heat mode, the temperature inside the vehicle is set to a set value t _SE
In addition to calculating the optimum blower fan speed for the air outlet temperature T _A calculated to control the temperature to _t ,
As described below, the microcomputer 50 is used to calculate the blower fan speed necessary for defogging the front window 40, these two blower fan speeds are compared, and the fan 24 is controlled to the higher speed. As a result, the temperature inside the vehicle is controlled to the set value t _SEt , and the front window 40 is reliably fog-proofed.

The following equation is an equation for calculating the fan motor voltage V ₂ that provides the fan speed required for defogging the front window 40 when installed in the heat mode.

Here, are relative humidity, A ₁ , A ₂ , A ₃ ,
A ₄ , A ₅ , and A ₆ are constants.

The microcomputer 50 has an outside air sensor 56
The vehicle outside temperature t _p detected by the inside air sensor 58
The fan motor voltage required for defogging the front window 40 is determined based on the third equation using the vehicle interior temperature t _r detected by the vehicle and the relative humidity near the windshield detected by the humidity sensor 62.
Calculate V ₂ . Then, the fan motor voltage V ₁ obtained by the second equation is compared with the fan motor voltage V ₂ obtained by the third equation, and the fan 24 is controlled to be driven at the higher fan speed.

In addition, in the air conditioner of this embodiment, it is possible to set a ventilator mode and a defroster mode in addition to the heat mode. In this case, the microcomputer 50 determines which mode is set and automatically switches the actuator 44. , 46. As a result, the damper 38,
42 is adjusted, and the air outlet 18, 20, 22
is selected according to the setting mode.

FIG. 3 is a flowchart showing the operation of the air conditioner of this embodiment.

The air conditioner of the present invention has the above configuration, and its operation will be explained next.

First, when the temperature setting device 52 is operated to set the air conditioner to the heat mode and the temperature inside the vehicle is set to t _SEt , the air conditioner is activated in step 10 shown in FIG.
The microcomputer 5 operates according to 0 to 104.
0 calculates the temperature _TA of air blown into the vehicle interior according to the first equation, and drives the actuator 36 so that the temperature of the air actually blown into the vehicle interior matches the calculated value _TA . Control opening degree.

At the same time, the microcomputer 50 drives the actuator 44 to control the opening degree of the damper 38 according to instructions from the temperature setting device 52.
While selecting either the heater outlet 18 or the vent outlet 20, the actuator 46 is driven to control the opening degree of the damper 42 of the defroster outlet 22.

Next, this air conditioner goes through step 10 shown in FIG.
6 to 110. That is, the microcomputer 50 calculates the fan voltage V ₁ that provides the optimum blowing fan speed corresponding to the blowing temperature T _A based on the second equation in step 106 , and calculates the blowing voltage necessary for defogging the front window 40 in step 110 . The fan voltage V ₂ that gives the fan speed is calculated based on the third equation.

The air conditioner then operates according to steps 112 to 116 shown in FIG. 3 to control the fan speed of the fan 24. That is, the microcomputer 50 compares the fan voltages V ₁ and V ₂ in step 112, and if it is determined that V ₁ ≧V ₂ , the process moves to step 114 and the fan motor 2 is
6 is driven with the fan voltage V ₁ , and if it is determined that V ₁ <V ₂ , the process moves to step 116 and the fan motor 26 is driven with the fan voltage V ₂ .

For this reason, when the air conditioner is set to the heat mode, air is blown into the vehicle interior from the heater outlet 18 or the defroster outlet 22 at the outlet temperature _TA by driving the fan 24, and the temperature inside the vehicle is t. _r is reliably controlled to the set temperature t _SEt .
Furthermore, the air required for defogging the front window 40 can always be obtained from the defroster outlet 22, so that the front window 4 can always be blown regardless of changes in outside air conditions.
0 means that fogging is definitely achieved.

Next, consider a case where the temperature setting device 52 is operated to set the air conditioner to a mode other than the heat mode.

In this case, the air conditioner operates according to steps 100-108, 118 shown in FIG. That is, the microcomputer 50 determines the set mode, reads input from each sensor in step 102 according to this set mode, and
As described above, in step 104, the temperature T _A of air blown into the vehicle interior is calculated and controlled, and further in step 1.
The fan motor voltage V ₁ that provides the optimum fan speed required for the mode set in step 06 is calculated.
Then, in step 108, the microcomputer 50 determines that the set mode is not the heat mode, and proceeds to step 118, where it drives the fan motor 26 in accordance with the fan motor voltage _V1 calculated in step 106. .

Although the present embodiment has been described using an example in which the front window is defogged, the air conditioner of the present invention is not limited to this, and can similarly be used to defog other windows.

As described above, according to the present invention, when the air conditioner is set to the heat mode that controls the temperature inside the vehicle interior to a predetermined set value, the speed control of the fan that blows air into the vehicle interior is controlled as compared to the conventional method. In order to control the temperature in the passenger compartment to the set value, we not only take into consideration the fan rotation speed required to defog the windows, but also take into consideration the fan rotation speed required to defog the windows. In addition to automatically controlling the temperature to a set value, it is also possible to reliably defog the windows of a car, especially the front window.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a preferred embodiment of the vehicle air conditioner according to the present invention, and Fig. ₂ is an explanatory diagram of a preferred embodiment of the vehicle air conditioner according to the present invention. Fan motor voltage that gives the fan rotation speed
FIG _. 3 is a flowchart showing the operation of the vehicle air conditioner of the present invention. 24... Juan, 40... Window, 50...
...Microcomputer as a control device, 62
...Humidity sensor.

Claims (1)

[Scope of utility model registration request] The temperature at which air is blown into the vehicle interior is calculated and controlled to a predetermined value based on the temperature outside the vehicle, the temperature inside the vehicle, and the amount of solar radiation, and the fan is driven at a rotation speed set in accordance with this temperature to blow air into the vehicle interior. In a vehicle air conditioner that controls the temperature inside the vehicle to a set temperature and also defogs the window using the air blowout, a humidity sensor installed near the window and a humidity sensor that controls the temperature outside the vehicle and the temperature inside the vehicle are used. A fan rotation speed necessary for defogging the window is calculated based on the temperature and humidity obtained from the humidity sensor, and this calculated value is compared with a fan rotation speed set corresponding to the blowing temperature, whichever is larger. 1. A vehicle air conditioner comprising: a control device that drives a fan at one rotational speed;