JPS63306913A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To prevent ventilating noise from increasing while ensuring a predetermined amount of blown air, by adjusting a signal of air blowing moderating a change of resistance of air blowing thereafter switching a mode when the mode of air introduction is switched from the mode of small ventilating noise to the mode of large ventilating noise. CONSTITUTION:A means 1 selects an air introducing mode to the mode of large ventilating noise and similarly to the mode of small ventilating noise, while a means 2 blows a flow of introduced air into a car room. Further an air conditioner generates a signal of switching the air introducing mode in a means 3 and a signal of blowing air in a means 4 as well. And a means 5, when the means 3 generates the switching signal from the mode of large ventilating noise to the similar mode of small ventilating noise, adjusts a value of the signal of blowing air generated from the means 4 moderating a change of resistance of blowing air thereafter controlling the means 1 so as to be selected. Then the means 5 again adjusts the value of the signal of blowing air so as to be returned to the value of the signal of blowing air generated from the means 4.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle air conditioner, and more particularly, to an air conditioner that automatically adjusts the amount of air blown into a vehicle interior when switching an air introduction mode. Relating to a harmonizing device.

(Prior art) Conventionally, in this type of air conditioner, in order to cope with the increase in ventilation noise due to changes in ventilation resistance when switching the air introduction mode from outside air introduction to inside air introduction, the air flow rate has been automatically adjusted. There are some things that have been made to decrease.

(Problem to be Solved by the Invention) However, in the above air conditioner, if the air introduction mode is switched when the maximum air blowing capacity is being exerted, such as during maximum cooling or maximum heating, The problem is that the maximum capacity cannot be maintained after that.

Therefore, in order to deal with this problem, the present invention aims to provide an air conditioner that can alleviate changes in ventilation noise only when switching the air introduction mode, and can always maintain a desired air flow rate.

(Means for Solving the Problems) The structural features of the present invention are as illustrated in FIG.
Air introduction mode switching means l for switching the air introduction mode to a first introduction mode with low ventilation noise (e.g., outside air introduction mode) or a second introduction mode with large ventilation noise (e.g., inside air introduction mode); and air introduction mode switching means. 1, a switching signal generating means 3 for generating a switching signal for switching the air introduction mode, and determining the amount of air to be blown into the vehicle interior. A ventilation signal generation means 4 for generating a ventilation signal; and a ventilation signal generation means in response to a switching signal for switching the air introduction mode from the first introduction mode to the second introduction mode when the switching signal generation means 3 is given the same signal. After adjusting the value of the ventilation signal applied to the ventilation means 2 from 4 to an appropriate value transiently to alleviate the change in ventilation resistance, the switching signal is applied to the air introduction mode switching means 1 to switch to the air introduction mode. The control means 5 is configured to switch the value of the air blowing signal and then readjust the value of the air blowing signal so as to return it to the value from the air blowing signal generating means 4.

(Operation and Effect) By configuring the present invention in this way, the switching signal generating means 3 generates a switching signal in order to change the air introduction mode from the first introduction mode where the ventilation noise is low to the second introduction mode where the ventilation noise is large. is generated, the control means 5 adjusts the value of the ventilation signal from the ventilation signal generation means 4 to alleviate the change in ventilation resistance, and then switches the air introduction mode switching means 1.
Since the ventilation noise is switched, the ventilation noise will not suddenly become louder. Furthermore, after the air introduction mode is changed to the second introduction mode, the value of the air blowing signal is adjusted again to return to the value from the air blowing signal generating means 4, so it is also possible to demonstrate the maximum air blowing capacity. .

(Example) Hereinafter, one example of the present invention will be described with reference to the drawings.
The figure shows the overall configuration of an air conditioner according to the present invention. This air conditioner includes an air duct 10, which includes a pair of inside/outside air switching dampers 20a, 20b, a blower 30, an air mix damper 40. Heaters 50 are sequentially arranged. The inside/outside air switching damper 20a is pivotally supported at the boundary between the outside air inlet 11 and the inside air inlet 12a of the air duct 10, and when switched to the first switching position (shown by a solid line in FIG. 2), the outside air inlet When the switch is switched to the second switching position (shown by a dotted line in FIG. 2), air is allowed to be introduced from the inside air inlet 12a, and when the neutral position is set to the neutral position (shown by the dotted line in FIG. 2) (shown by a dashed line), air is allowed to be introduced from both inlet ports 11 and 12a. The inside/outside air switching damper 20b is pivotally supported at the boundary between the outside air inlet 11 and the inside air inlet 12b of the air duct 10, and when switched to the first switching position (shown by a solid line in FIG. 2), outside air is introduced. Allows air to be introduced from the opening 11, and when switched to the second switching position (shown by a dotted line in FIG. 2), allows air to be introduced from the inside air inlet 12b;
When switched to the neutral position (indicated by a dashed line in FIG. 2), air is allowed to be introduced from both inlet ports 11 and 12b.

The servo motor 21 includes both an internal and external air switching damper 20a,
20b, and a built-in position detection mechanism detects the positions of the dampers 20a and 20b to generate a damper position detection signal. Switching damper 20
a and 20b are simultaneously switched to either the first switching position, the second switching position, or the neutral position.

The blower 30 is rotated by the drive of a blower motor 31,
An air flow corresponding to the rotational speed is introduced into the air duct 10 via both the inside and outside air switching dampers 20a and 20b, and sent to the air mix damper 40 to be blown out into the vehicle interior. The air mix damper 40 has its opening degree controlled by the drive of an operatively connected servo motor 41, and depending on the actual opening degree, the temperature of the air flow is adjusted in cooperation with the heating action of the heater 50. Adjust. In such a case, the servo motor 41 has a position detection mechanism (not shown), which detects the actual opening degree of the air mix damper 40 and controls the opening degree.

In addition, in FIG. 2, each code|symbol 13-17 each shows the air outlet into the air duct 100 vehicle interior, and each code|symbol 61-64 each shows an air outlet switching damper.

In addition, the air conditioner has a self-resetting type operation switch 7.
Equipped with 0A, 70B, 70C, operation switch 70
A is operated when the air introduction mode is set to outside air introduction, and generates an outside air switching signal. The operation switch 70B is
When the air introduction mode is set to indoor air introduction, it is operated to generate an indoor air switching signal. The operation switch 70C is operated when the air introduction mode is set to a mixture of inside and outside air, and generates a mixture switching signal. The temperature setting device 80A is set with a target vehicle interior temperature and generates a set temperature analog signal.

The inside temperature sensor 80B detects the actual temperature inside the vehicle and generates the detected temperature as an inside temperature analog signal. The outside temperature sensor 80C detects the actual temperature outside the vehicle and generates the detected temperature as an outside temperature analog signal. The solar radiation sensor 80D detects solar radiation entering the vehicle interior and generates the detected amount of solar radiation as a solar radiation analog signal.

The A-D converter 81 includes a temperature setting device 80A and each sensor 8.
Each analog signal from 0B, 80C, and 80D is converted into a digital signal.

The microcomputer 90, in response to the power supply from the DC power supply B upon closing of the ignition switch IG, executes a computer program previously stored in its ROM to each operating switch. Execute according to the flowchart shown in FIG. 3 in cooperation with 0A to 70C and A-D converter 81,
During execution, the drive circuit 91 performs arithmetic processing necessary for controlling each of the drive circuits 91, 92, and 93. Under the control of the microcomputer 90, the drive circuit 91 moves both the inside and outside air switching dampers 20a and 20b to the first switching position. , servo motor 2 to switch to the second switching position or neutral position.
Drive 1. The drive circuit 92 drives the blower motor 31 to rotate the blower 30 under the control of the microcomputer 90 . The drive circuit 93 drives the servo motor 41 under the control of the microcomputer 90 to bring the air mix damper 40 to a target opening.

In this embodiment configured as described above, when the both internal and external air switching dampers are in the first switching position, when the ignition switch IG is closed to put the device of the present invention into the operating state, the microcomputer 90 operates as shown in FIG. The computer program is executed from step 100 according to the flowchart, and in the next step 101, the A-D converter 81
Temperature setting digital signal, internal temperature digital signal,
When receiving the outside temperature digital signal and the solar radiation digital signal, the values of each signal are set as the temperature setting value Ts, the inside temperature value Tr, and the outside temperature 11.
1T &, stored as solar radiation value St. In the next step 102, the microcomputer 90 receives a damper position detection signal from the position detection mechanism of the servo motor 21, and sets a flag based on the fact that both the inside and outside air switching dampers 20a and 20b are in the first switching position. Set F=1.

The microcomputer 90 sets the flag F=2 when both the internal and external air switching dampers 20a and 20b are at the second switching position, and sets the flag F=0 when they are at the neutral position.

Then, the microcomputer 90 performs step 103.
, select the following (1) from each value stored in step 101.
Calculate the required air outlet temperature TAO based on the formula.

TAO=KsXTs-KrXTr-KaXTa-Kt
Xs t+c @--(1) Here, Ks, Kr, Ka, and KL each represent a coefficient, and C represents a correction constant. After such calculation, the microcomputer 90 determines the target opening degree of the air mix damper 40 in step 103a in order to bring the temperature of the airflow into the vehicle interior to the required blowout temperature TAO calculated in step 103. Then, an opening control signal representing the determined target opening is generated and applied to the drive circuit 93. Then, the drive circuit 93 drives the servo motor 41 in response to the opening degree control signal, and adjusts the air mix damper 40 toward the target opening degree under the action of the position detection mechanism.

When the computer program proceeds to step 104, the microcomputer 90 stores the ROM in advance based on the required air temperature TAO calculated in step 103.
The blown air flow rate Va is determined from the relationship between the required blown air temperature TAO and the blown air flow rate Va stored in the above. In such a case, the relationship between the required blowout temperature TAO and the blowout air flow rate Va is -60°C<TAO, as shown in FIG.
Va in the range of 15℃ and 90℃<TAO<125℃
is maximum 1! [(Hi), 25℃<TAO<50℃
Va becomes the minimum value (L o) in the range of -15℃<T
In the range of AO<25°C, Va decreases as TAO increases, and in the range of 50°C<TAO<90°C, Va increases as TAO increases. The microcomputer 90 then generates a blower motor control signal representing the determined airflow fiVa described above and applies it to the drive circuit 92 in step 104a. Then, the drive circuit 92 drives the blower motor 31 to rotate the blower 30, and the blower 30 introduces air at the determined airflow ff1Va and blows it out toward the interior of the vehicle. After that, the microcomputer 90 performs each step 105, 106, 107, 108,
At 109 and 110, it is sequentially determined to be rNOJ.

When the operating switch 70B is closed to generate an internal air switching signal during the repeated calculations in steps 101 to 110 as described above, the microcomputer 90 in step 105 selects F=1 and internal air switching in step 102. Based on the generation of the signal, it is determined that it is rYESJ. Next, the microcomputer 90 performs step 105a.
At step 105, the timer (built in the microcomputer 90) is reset to start measuring time.
In step b, the airflow flVa determined in step 103 is
The blower motor control signal is generated at a reduced level (in this embodiment, for example, 10% of the Hi-Lo leap is the level). The drive circuit 92 then reduces the rotational speed of the blower motor 31 so that the blower 30 delivers the airflow at the two level reduced value.

In the next step 105c, when the time T of the timer reaches 1 second while repeating the determination "NO", the microcomputer 90 determines "rYES" and advances the computer program to step 105d. Then, in step 105d, the microcomputer 90 generates an internal air switching control signal and applies it to the drive circuit 91, and the driving circuit 91 controls the servo motor 21 to switch both the internal and external air switching dampers 20a and 20b to the second Switch to the switching position. Next, the microcomputer 90
At step 106e, the determination "rNO" is repeated, and when the timer T reaches 2 seconds, it is determined rYESJ and the computer program proceeds to step 105f.

Then, the microcomputer 90 performs step 105.
A blower motor control signal corresponding to the value in which the airflow fiVa, which is decreased by 2 levels determined in step b, is increased by 1 level, is generated and applied to the drive circuit 92, and the drive circuit 92 increases the rotation speed of the blower motor 31, so that the blower 30 increases. The air flow will be delivered at the increased level.

Further, in the next step 105g, when the timer T reaches 3 seconds while repeating the determination of rN OJ, the microcomputer 90 determines "YESJ" and advances the computer program to step 105h. 90 is step 105f
A blower motor control signal corresponding to the value in which the air flow rate Va determined by the level increase is further increased is generated and applied to the drive circuit 92, and the drive circuit 92 controls the blower motor 3.
1, the blower 30 increases the rotational speed of step 103.
The airflow is now sent at the original airflow filVa determined in .

Further, during the repeated calculations of each step 101-110 as described above, the operation switch 70B may be replaced with the operation switch 70B.
When 0C is closed and a mixed switching signal is generated, the microcomputer 90 determines "YESJ" in step 106 based on F=1 in step 101a and the generation of the mixed switching signal. , in step 106a, the timer is reset to start counting, and the next step 10
At step 6b, a blower motor control signal corresponding to the value obtained by subtracting the air flow fiVa determined at step 103 is generated. The drive circuit 92 then reduces the rotational speed of the blower motor 31 so that the blower 30 delivers airflow at the reduced level.

When the timer T reaches 1 second during the repetition of rNOJ/Which determination in step 106c,
The microcomputer 90 determines "rYES" and advances the computer program to step 106d. Then, the microcomputer 90 performs the same step 106d.
, a mixture switching control signal is generated and applied to the drive circuit 91, and the drive circuit 91 controls the servo motor 21 to switch both the inside and outside air switching dampers 20a and 20b to the neutral position. Next, the microcomputer 90 repeats the determination "rNO" in step 106e, and when the timer T reaches 2 seconds, the microcomputer 90 determines "YESJ" and advances the computer program to step 106f.Then, the microcomputer 90 A blower motor control signal corresponding to the original value obtained by increasing the level of air 111Va determined in step 106b is generated and applied to the drive circuit 92, and the drive port 892 controls the blower motor 31
The rotational speed of the blower 30 is increased so that the blower 30 sends an air flow at the original air flow rate Va determined in step 103.

After the arithmetic processing as described above, each step 1 as described above is performed.
When the operating switch 70B is closed to generate the internal air switching signal during the repeated calculations of steps 01-110, the microcomputer 90 will proceed to step 10 in step 107.
Based on F=0 in No. 2 and the generation of the mixed switching signal, r Y E and S J are determined. After that, the microcomputer 90 performs the following steps 107a-107f.
Substantially the same arithmetic processing as in steps 106a to 106f described above is performed at step 106a to 106f. In such a case, the microcomputer 90 generates an internal air switching control signal in step 107d instead of the mixing switching control signal in step 106d.

As explained above, when switching from outside air introduction to inside air introduction, from outside air introduction to inside/outside air mixed introduction, or from inside/outside air mixed introduction to inside air introduction,
Since the mode is switched after reducing the blown air flow rate Va in advance, noise does not increase due to an increase in ventilation resistance. Further, since the blown air flow fiVa is returned to its original state after the mode is switched, even when the air conditioner is operating at its maximum capacity, this state can be maintained.

Also, when switching modes that reduce ventilation resistance (
That is, when switching from inside air introduction to outside air introduction, when switching from inside air introduction to inside/outside air mixture introduction, or when switching from inside/outside air mixing introduction to outside air introduction), each step 108
, 109, and 110, respectively, to determine the state,
At each step 108a, 109a, 110a, a control signal for switching to the respective introduction mode is generated to switch both the inside and outside air switching dampers 2OA, 20B.

In addition, in the above embodiment, each introduction mode is switched by each operation switch. Although this was done by operating from 0A to 70C, instead of this, based on the required air outlet temperature TAO calculated in step 103, for example, the relationship between the required air outlet temperature TAO and the air introduction mode as shown in FIG. According to each step 105, 106, 107, 10
8,109.110 may be used.

Further, in the embodiment, in step 105a,
Although the blown air flow rate Va is reduced by two levels, the present invention is not limited to this, and the number of reduction levels may be changed as appropriate, and the air flow rate Va is increased every second. However, the present invention is not limited to this, and the time for increase may be changed as appropriate.

Further, in the embodiment, the blown air flow fiVa
is automatically controlled, but the invention is not limited to this, and the blown air flow ff1Va may be controlled manually.

Further, in the above embodiments, an example in which the present invention is applied to an air conditioner having only a heating effect has been described, but the present invention is not limited to this, and the present invention may be applied to an air conditioner having a cooling effect. .

Further, in the embodiment described above, a case has been described in which the air introduction mode includes an inside/outside air mixture introduction mode, but the present invention may be applied to an air conditioner that does not have an inside/outside air mixture introduction mode.

Further, in the above embodiment, the air introduction mode is switched after decreasing the blown air flow rate Va, but instead of this, the air introduction mode may be switched after increasing the blown air flow rate Va. good.

[Brief explanation of drawings]

FIG. 1 is a diagram corresponding to the configuration of the invention described in the claims, FIG. 2 is an overall configuration diagram of an embodiment of the present invention, FIG. 3 is a flowchart showing the operation of the microcomputer in FIG. 2, and FIG. The figure is a characteristic diagram showing the relationship between the necessary blowing temperature TAO and the blowing air flow ff1Va, and FIG. 5 is a characteristic diagram showing the relationship between the necessary blowing temperature TAO and the air introduction mode in a modification of the present invention. Explanation of symbols 10...Air duct, 20a, 20b...Inside/outside air switching damper, 21...Servo motor, 30...Blower, 31...Prower motor, 70A, 70B, 70
C...Operation switch, 80A...Temperature setting device, 80
B...Inside temperature sensor, 80C...Outside temperature sensor, 80
D... Solar radiation sensor, 81... A-D converter, 90...
...Microcomputer, 91.92...Drive circuit. Figure 1 Country 4 Figure 5 15 j3.5 235

Claims (1)

[Claims] an air introduction mode switching means for switching the air introduction mode to a first introduction mode with low ventilation noise or a second introduction mode with high ventilation noise; and sending the air flow introduced through the air introduction mode switching means into the vehicle interior. A ventilation means, a switching signal generation means for generating a switching signal for switching the air introduction mode, a ventilation signal generation means for generating a ventilation signal for determining the amount of air blown into the vehicle interior, and the switching signal generation means. When a switching signal for switching the air introduction mode from the first introduction mode to the second introduction mode is applied, the value of the air blowing signal applied from the air blowing signal generating means to the air blowing means in response to the same signal is transiently changed. After adjusting the ventilation resistance to an appropriate value to alleviate changes in ventilation resistance, the switching signal is applied to the air introduction mode switching means to switch the air introduction mode, and then the value of the ventilation signal is changed to the value of the ventilation signal from the ventilation signal generation means. A vehicle air conditioner comprising: a control means for readjusting the air conditioner so as to return the air conditioner to the desired value;