JP2017223553A - Environmental test device and air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an environmental test device capable of settling a wind velocity within a testing room into a novel target wind velocity in a short time even if a difference between a current target wind velocity and the novel target wind velocity is large.SOLUTION: An environmental test device comprises: a testing room 2 in which an object to be tested is installed; a wind velocity sensor 8; an air conditioning part 3; an air blower 16 capable of increasing/decreasing a rotation speed; a circulation flow passage 5 for circulating air between the air conditioning part 3 and the testing room 2; and aperture adjustment means 30 and 33. There is a standard rotation speed of the air blower 16 corresponding to a target wind velocity. The environmental test device can be operated in a normal control mode that a wind velocity within the testing room 2 is adjusted by controlling the aperture adjustment means 30 and 33 while rotating the air blower 16 at the standard rotation speed or in the vicinity thereof. When changing the wind velocity within the testing room 2 from a current target wind velocity to a novel target wind velocity, the environmental test device can be operated in a shift-time control mode that the wind velocity within the testing room 2 is made closer to the novel target wind velocity by limiting an aperture of an air flow passage within a fixed aperture range through the aperture adjustment means 30 and 33 and rotating the air blower 16 at a predetermined shift-time rotation speed.SELECTED DRAWING: Figure 1

Description

The present invention relates to an environmental test apparatus that can create a specific environment in a test chamber and expose a device under test to a desired environment, and an air conditioner that supplies conditioned air to the test chamber.
The environmental test apparatus and the air conditioner of the present invention are suitable for an application in which an environmental test is performed in a ventilation environment in a test chamber.

Environmental tests are known as tests for examining the performance and durability of products and parts. Environmental tests are performed using equipment called environmental test equipment. The environmental test apparatus artificially creates, for example, a high temperature environment, a low temperature environment, a high humidity environment, and the like.
Some environmental test apparatuses have an air conditioning unit for adjusting temperature and humidity integrated with the test room, and others have an air conditioner separately from the test room, and the air conditioning unit and the test room are separated.

By the way, an aircraft, a vehicle, a train, etc. hits each part at the time of flight or traveling. Therefore, in order to reproduce the environment during traveling of an aircraft or a vehicle, an environment test may be performed by creating a ventilation environment in a test chamber and exposing a test object therein. An apparatus capable of creating a ventilation environment is disclosed in, for example, Patent Document 1.
Environmental test equipment that creates a ventilated environment may be large in the size of the DUT or the device that drives the DUT may be large. Sometimes.

JP-A-2-311732

  FIG. 1 is a conceptual diagram of an environmental test apparatus 100 that can create a ventilation environment in a test chamber. Note that the environmental test apparatus 100 shown in FIG. 1 is a prototype manufactured by the present inventors and is not a commercial product itself.

In the environmental test apparatus 100, the test chamber 2 and the air conditioning unit 3 are separate bodies as described above. In the environmental test apparatus 100, the air conditioning unit 3 and the test chamber 2 are connected by a circulation channel (air channel) 5.
The test chamber 2 has a test space 6 in which a DUT is installed. The test space 6 is covered with a heat insulating wall 7.
A wind speed sensor (fan information detecting means) 8 is provided in the test chamber 2.
The test chamber 2 has an air inlet 10 and an air outlet 11.

The air conditioning unit 3 has a ventilation space (not shown) inside, and an air conditioning device 18 is incorporated therein. The air conditioner 18 includes a cooling device 12, a humidifying device 13, and a heater 15. Therefore, the air conditioning unit 3 includes a cooling device 12, a humidifying device 13, a heater 15, and a blower 16. The blower 16 is inverter-controlled, and can increase or decrease the amount of blown air by changing the rotational speed of the motor.
The air conditioning unit 3 has an air supply port 20 for sending air to the test chamber 2 side and an air return port 21 for introducing the air returned from the test chamber 2 into the air conditioning unit 3.
The air conditioning unit 3 has a function of introducing air from the air return port 21 to the ventilation space (not shown), adjusting the temperature and humidity of the air while passing through the ventilation space, and blowing air from the air supply port 20 by the blower 16. have.

In the environmental test apparatus 100, the test chamber 2 and the air conditioning unit 3 are separate bodies, and the two are connected by a circulation channel 5.
That is, the air supply port 20 of the air conditioning unit 3 and the air supply inlet 10 of the test chamber 2 are connected by the forward air flow path 22. Further, a return side air flow path 25 connects between the air discharge port 11 of the test chamber 2 and the air return port 21 of the air conditioning unit 3. Both the forward air passage 22 and the return air passage 25 are ducts.

The forward side air passage 22 is provided with forward side opening degree adjusting means 30. The return side air passage 25 is provided with return side opening degree adjusting means 33. The forward side opening degree adjusting means 30 and the return side opening degree adjusting means 33 are both motor dampers, and the opening degree can be arbitrarily changed.
In the prototype environmental test apparatus 100, both the forward opening degree adjusting means 30 and the return side opening degree adjusting means 33 are controlled by a PID control device. In the environmental test apparatus 100, the forward opening degree adjusting means 30 and the return side opening degree adjusting means 33 are opened and closed synchronously. Therefore, both may be collectively referred to as opening degree adjusting means 30, 33 hereinafter.

In the environmental test apparatus 100, the environment of the test room 2 is set by an input device (not shown). In the environmental test apparatus 100, the target wind speed is input in addition to the set temperature and set humidity.
In the environmental test apparatus 100, the wind speed sensor 8 in the test chamber 2 detects the wind speed of the wind hitting the test object, and the wind speed is fed back to the blower 16 and the opening degree adjusting means 30, 33, so that the wind speed in the test chamber 2 is measured. Is adjusted to the target wind speed.
In principle, when the wind speed detected by the wind speed sensor 8 is lower than the target wind speed, the rotation speed of the blower 16 is increased and the opening adjustment means 30 and 33 are opened.
In principle, when the wind speed detected by the wind speed sensor 8 exceeds the target wind speed, the rotational speed of the blower 16 is reduced and the opening degree of the opening degree adjusting means 30 and 33 is narrowed.

The environmental test apparatus 100 can arbitrarily set the wind speed in the test chamber 2. Further, the wind speed in the test chamber 2 can be changed during the test. For example, when the current wind speed (current target wind speed) is 10 m / s, it can be increased to 11 m / s, which is the new target wind speed. Conversely, when the current target wind speed is 11 m / s, it can be lowered to a new target wind speed of 10 m / s.
However, for example, when the current target wind speed and the actual wind speed are 3 m / s and it is desired to increase the current target wind speed to 15 m / s, which is the new target wind speed, or the current target wind speed is 15 m / s, the new target wind speed is 3 m / s. When the fluctuation range is large as in the case where it is desired to descend to s, it may take too much time to change from the current target wind speed to the new target wind speed. When this reason was examined, it became clear that there were the following factors.

That is, in the prototype environmental test apparatus 100, the wind speed detected by the wind speed sensor 8 is fed back to the opening degree adjusting means 30 and 33. Here, the opening degree adjusting means 30 and 33 are motor dampers, and can change the opening degree from a substantially fully closed state to a fully open state.
Therefore, for example, if the current target wind speed is low, the blower 16 may rotate at a low speed, and the opening degree adjusting means 30 and 33 may be in a small opening degree.
On the other hand, when the new target wind speed is significantly faster than the current target wind speed, it is necessary to increase the rotation speed of the blower 16 to rotate at a high speed and greatly increase the opening degree of the opening degree adjusting means 30 and 33. There is a case.
Here, the rotation speed of the blower 16 has high responsiveness, and reaches the set high-speed rotation state at an early stage. On the other hand, the opening degree adjusting means 30 and 33 have low responsiveness, and it takes time to greatly open the opening degree from the state where the opening degree is strongly throttled.

In addition, when the opening degree of the opening adjusting means 30, 33 is increased, the opening operation is temporarily delayed, the opening operation is temporarily stopped, or conversely, the opening operation is performed. was there. In addition, the opening degree adjusting means 30 and 33 may hunt and repeat the opening direction operation and the closing direction operation. In addition, the wind speed change sometimes overshoots.
This reason is expected due to the difference between the response speed of the blower 16 and the response speed of the opening degree adjusting means 30 and 33.
That is, since the blower 16 has a fast response speed, the rotational speed changes quickly, and the wind speed in the test chamber 2 rapidly increases. The opening degree adjusting means 30 and 33 are controlled by a PID control device. That is, the opening degree of the opening degree adjusting means 30, 33 is adjusted by proportional control, integral control, and differential control.
Here, since the PID control device includes differential control, when the wind speed in the test chamber 2 rapidly increases, the opening degree adjusting means 30 and 33 may be operated in a direction to suppress this change. Therefore, even when the wind speed in the test chamber 2 does not reach the new target wind speed, the movement of opening the opening degree adjusting means 30 and 33 is stopped from the magnitude of the change gradient (differential component) of the wind speed in the test chamber 2. There is.

  Moreover, in the prototype environmental test apparatus 100, since both the opening degree of the opening degree adjusting means 30 and 33 and the rotational speed of the blower 16 are changed, when the target wind speed is low, the rotational speed of the blower 16 is low and low. On the other hand, there are cases where the wind speed in the test chamber 2 is stable at the target wind speed with the opening degree of the opening degree adjusting means 30, 33 being large.

In this way, when the target wind speed is low, the rotational speed of the blower 16 is low, and the opening speed of the opening adjustment means 30, 33 is large, and the wind speed in the test chamber 2 is stable at the target wind speed. Assume that the new target wind speed is switched to a high speed.
In this case, assuming that the rotational speed of the blower 16 is high and the opening degree adjusting means 30 and 33 are medium opening degrees and the wind speed in the test chamber 2 is stable, the blower 16 shifts from low speed to high speed. Then, the opening degree adjusting means 30 and 33 shift from the fully open state toward the half open state.

Here, since the response speed of the blower 16 is fast, it quickly shifts from a low speed to a high speed. On the other hand, it takes time for the opening degree adjusting means 30 and 33 to shift from the fully open state to the half open state, and the opening degree adjusting means 30 and 33 are in the fully open state although the blower 16 is in a high speed state. It may be in a state where it has only moved slightly in the closing direction.
As a result, the wind speed in the test chamber 2 may overshoot.

  In addition, the opening degree adjusting means 30 and 33 that have started to open may operate in the closing direction by the action of proportional control or differential control of the PID control device. Furthermore, the opening degree adjusting means 30 and 33 may hunt.

If the PID control parameters are appropriate, the operation of the opening degree adjusting means 30 and 33 will also be appropriate, but if the amount of change in the rotational speed of the blower 16 is large, an appropriate parameter is found. It may be difficult or there may be no appropriate parameters in the first place.
That is, in order to perform PID control, it is necessary to set a P value that is a parameter for proportional control, an I value that is a parameter for integral control, and a D value that is a parameter for differential control. However, the effects of the parameters in PID control are correlated, and experience and knowledge are required to obtain the optimum value of the PID parameter according to the characteristics of the controlled object.

  The present invention pays attention to the above-mentioned problem, and even when the difference between the current target wind speed and the new target wind speed is large, an environmental test apparatus capable of converging the wind speed in the test room to the new target wind speed in a short time, and An object is to provide an air conditioner.

  The invention according to claim 1 for solving the above-described problem includes a test chamber in which the DUT is installed, a blast information detecting means for detecting information related to a blast environment of the test chamber, an air conditioning unit, and a rotation speed. A fan that can be increased or decreased, an air flow channel that allows air to flow between the air conditioning unit and the test chamber, and an opening adjustment means that increases or decreases the opening of the air flow channel. In the environmental test apparatus for adjusting the wind speed in the test chamber to the target wind speed by controlling the rotation speed of the blower and the opening adjustment means, there is a standard speed of the blower corresponding to the target wind speed, and the standard speed Is the number of revolutions that the wind speed in the test chamber is assumed to be the target wind speed when the opening adjustment means is set to a predetermined standard opening, and the opening adjustment means is controlled while rotating the blower at or near the standard rotation speed. In normal control mode to adjust the wind speed in the test chamber. When the wind speed in the test chamber is changed from the current target wind speed to the new target wind speed, the opening of the air flow passage is limited to a certain opening range by the opening adjustment means, and the blower is moved to a predetermined range. It is possible to operate in the transition period control mode that rotates at the number of rotations to bring the wind speed in the test chamber closer to the new target wind speed, and when the wind speed in the test chamber reaches the new target wind speed or reaches a certain range with respect to the new target wind speed, An environmental test apparatus that releases a transition period control mode and executes a normal control mode.

Here, "The wind speed in the test chamber reaches the new target wind speed or reaches a certain range with respect to the new target wind speed" means that when the wind speed in the test chamber reaches the new target wind speed, the wind speed in the test chamber becomes the new target wind speed. If it has not reached, but has approached considerably, the amount of change in the wind speed in the test chamber is excessive, including the case where it has changed beyond the new target wind speed.
In the environmental test apparatus of the present invention, there are a normal control mode and a transition period control mode as operation modes. The normal control mode is an operation mode for adjusting the wind speed in the test chamber by controlling the opening degree adjusting means while rotating the blower at or near the standard rotation speed. According to the normal control mode, if the air blowing environment in the test chamber slightly changes and deviates from the target wind speed, it can be corrected quickly.
The transition period control mode is an operation mode that is executed when the target wind speed is changed during the test. The transition period control mode is not necessarily executed when the target wind speed is changed, and is preferably executed only when the change width is large.
In the transition period control mode, the opening degree of the air flow path is limited to a certain opening degree range by the opening degree adjusting means. Therefore, the operation of the opening degree adjusting means is quick because it does not depend on feedback control in principle. Moreover, since the response of the blower is fast as described above, it reaches the new target wind speed or its vicinity at an early stage. When the wind speed in the test chamber reaches the new target wind speed or reaches a certain range with respect to the new target wind speed, the transition period control mode is canceled and the normal control mode is executed. This stabilizes the wind speed in the test chamber.

  According to the second aspect of the present invention, the transition speed is different from the standard speed and is determined according to the new target wind speed, and the difference between the transition speed and the standard speed is the new target wind speed. 2. The environmental test apparatus according to claim 1, wherein the environmental test apparatus is within a predetermined ratio range with respect to a corresponding standard rotational speed.

  According to the present invention, since the rotational speed at the time of transition is not excessively different from the standard rotational speed, it is difficult to cause hunting.

In the invention according to claim 3, the transition period control mode includes an acceleration mode and a deceleration mode,
The acceleration mode is a transition period control mode that is executed when the new target wind speed is higher than the current target wind speed, and the deceleration mode is a transition period control mode that is performed when the new target wind speed is slower than the current target wind speed. The opening range of the opening adjusting means in the acceleration mode is not less than the standard opening, and the opening range of the opening adjusting means in the deceleration mode is not more than the standard opening. It is an environmental test apparatus of description.

In the invention according to claim 4, the transition period control mode includes an acceleration mode and a deceleration mode,
The acceleration mode is a transition period control mode that is executed when the new target wind speed is higher than the current target wind speed, and the deceleration mode is a transition period control mode that is performed when the new target wind speed is slower than the current target wind speed. 4. The environmental test apparatus according to claim 1, wherein the rotational speed at the time of transition in the acceleration mode is equal to or higher than the standard rotational speed, and the rotational speed at the time of transition in the deceleration mode is equal to or lower than the standard rotational speed. It is.

  According to a fifth aspect of the present invention, the transition period control mode includes an acceleration mode and a deceleration mode, and the acceleration mode is a transition period control mode that is performed when the new target wind speed is faster than the current target wind speed, and the deceleration mode The mode is a transition period control mode that is implemented when the new target wind speed is slower than the current target wind speed. The opening range of the opening adjustment means in the acceleration mode is wider than the standard opening, and the opening adjustment in the deceleration mode The opening range of the means is narrower than the standard opening, the transition speed in the acceleration mode is higher than the standard speed, and the transition speed in the deceleration mode is lower than the standard speed. It is an environmental test apparatus in any one of thru | or 4.

  According to the inventions of claims 3 to 5, the wind speed in the test chamber reaches the new target wind speed at an early stage.

  It is desirable that the transition period control mode is executed when the difference between the current target wind speed and the new target wind speed is equal to or greater than a certain value.

  It is desirable to have a PID control device, and the opening degree of the opening degree adjusting means is controlled by the PID control device.

  Another invention that solves the same problem is an air conditioner that blows air to the test room, and includes air blowing information input means for inputting information relating to the air blowing environment of the test room, an air conditioning unit, and the rotation speed. A fan that can be increased or decreased, an air flow channel that allows air to flow between the air conditioning unit and the test chamber, and an opening adjustment means that increases or decreases the opening of the air flow channel. In the air conditioner for adjusting the wind speed in the test chamber to the target wind speed by controlling the rotation speed of the blower and the opening adjustment means, there is a standard speed of the blower corresponding to the target wind speed, and the standard speed is This is the number of revolutions that is assumed to be the target wind speed when the opening adjustment means is set to a predetermined standard opening, and the opening adjustment means is controlled while rotating the blower at or near the standard rotation speed. The normal control mode is used to adjust the wind speed in the test chamber. When the wind speed in the test chamber is changed from the current target wind speed to the new target wind speed, the opening of the air flow passage is limited to a certain opening range by the opening adjustment means, and the blower is moved to a predetermined range. It is possible to operate in the transition period control mode that rotates at the number of rotations to bring the wind speed in the test chamber closer to the new target wind speed, and when the wind speed in the test chamber reaches the new target wind speed or reaches a certain range with respect to the new target wind speed, The air conditioner is characterized in that the transition period control mode is canceled and the normal control mode is executed (claim 8).

  According to the present invention, the wind speed in the test chamber can be quickly reached the new target wind speed.

  According to the environmental test apparatus and the air conditioner of the present invention, the wind speed in the test chamber can be converged to the new target wind speed in a short time even when the difference between the current target wind speed in the test room and the new target wind speed is large. it can.

It is a principle figure of the environmental test apparatus prototyped in the embodiment and development process of the present invention. It is a block diagram of the control apparatus employ | adopted with the environmental test apparatus of embodiment of this invention. (A) is a graph which shows the correlation of the wind speed in a test chamber, and the rotation speed of an air blower in the environmental test apparatus of embodiment of this invention, and the relationship between a standard rotation speed and the rotation speed at the time of transition, (b) is the environment. It is a graph which shows the relationship between the wind speed in a test chamber in a test device, the standard opening of an opening degree adjustment means, and the opening at the time of a transition. It is a flowchart which shows operation | movement of the environmental test apparatus of embodiment of this invention. (A) is a graph which shows the correlation of the wind speed in a test chamber and the rotation speed of an air blower in the environmental testing apparatus of other embodiment of this invention, and the relationship between a standard rotation speed and the rotation speed at the time of transition, (b). It is a graph which shows the relationship between the wind speed in the test chamber in the environmental test apparatus, the standard opening of the opening adjusting means, and the opening at the time of transition.

Embodiments of the present invention will be further described below.
The mechanical configuration of the environmental test apparatus 1 of the present embodiment is the same as that of the prototype environmental test apparatus 100. The difference between the environmental test apparatus 1 of the present embodiment and the prototype environmental test apparatus 100 is a wind speed control method. The environmental test apparatus 1 according to the present embodiment includes a control device 27 that controls the air conditioner 26. As shown in FIG. 2, the control device 27 includes a PID control device 35 that controls the forward opening degree adjusting means 30 and a PID control device 36 that controls the return side opening degree adjusting means 33.
The control device 27 includes a control unit 28. The control unit 28 functions as a blast information input unit, a motor control unit, and a storage unit. The control unit 28 stores an operation program. This will be described below.

Also for the environmental test apparatus 1 of the present embodiment, the environment of the test chamber 2 is set by an input device (not shown). In the environmental test apparatus 1 as well, the target wind speed is input in addition to the set temperature and set humidity.
Then, an operation switch is turned on to drive the environmental test apparatus 1 and each device is activated. Among the devices constituting the environmental test apparatus 1, the air conditioner 18 of the air conditioning unit 3 is controlled so as to send air having a set temperature and a set humidity to the test chamber 2 as in the conventional case.
That is, the cooling device 12, the humidifying device 13, and the heater 15 in the air conditioning unit 3 are PID-controlled so that the temperature and humidity in the test chamber 2 match the set values.
Further, a signal from the wind speed sensor (fan information detecting means) 8 is input to the fan information input means of the control device 27 so that the wind speed in the test chamber 2 is monitored and the wind speed in the test chamber 2 matches the target wind speed. The blower 16, the forward circulation opening degree adjusting means 30, and the return side circulation opening degree adjusting means 33 are controlled. That is, the rotational speed of the blower 16 is controlled by the motor control means of the control device 27. Further, the forward circulation opening degree adjusting means 30 and the return side circulation opening degree adjusting means 33 are controlled by the PID control devices 35 and 36.

In this embodiment, there are a normal control mode and a transition period control mode as operation modes. Further, an acceleration mode and a deceleration mode are prepared as transition period control modes. These operation modes are implemented according to an operation program.
The normal control mode is an operation mode executed mainly when the air blowing environment in the test chamber 2 is stable, and the opening degree adjusting means 30 and 33 are PID controlled while rotating the blower 16 at the standard rotation speed. This is an operation mode in which the wind speed in the test chamber 2 is finely adjusted.

Here, the standard rotational speed of the blower 16 will be described. The standard rotational speed is the standard rotational speed of the blower corresponding to the target wind speed, and the rotational speed assumed that the wind speed in the test chamber 2 becomes the target wind speed when the opening degree adjusting means 30 and 33 are set to a predetermined standard opening degree. Is a number.
The standard opening degree of the opening degree adjusting means 30 and 33 is arbitrary, but is determined in consideration of the expected fluctuation direction of the air flow in the test chamber 2.
For example, when there are many cases where the air blown in the test chamber 2 fluctuates downward with respect to the target wind speed due to a disturbance, the standard opening is set to be low in order to increase the margin for correcting the air blow amount upward. On the contrary, when the air flow in the test chamber 2 often fluctuates upward with respect to the target wind speed, the standard opening degree is set higher to increase the margin for correcting the air flow rate downward.
If neither can be said, the standard opening is set near the middle of the movable range. In the present embodiment, the standard opening is set to 50% (percent) opening based on the fully opened state, but the present invention is not limited to this opening.

  The solid line in FIG. 3A indicates the correlation between the rotational speed of the blower 16 and the wind speed in the test chamber 2 when the opening degree of the opening degree adjusting means 30 and 33 is fixed to 50% (percent). . The solid line in FIG. 3A is the standard rotational speed, and in the normal control mode, control is performed so that the rotational speed of the blower 16 becomes the standard rotational speed.

In the normal control mode, the opening degree adjusting means 30 and 33 are PID controlled as described above, and the opening degree is changed. Therefore, in the normal control mode, the opening degree of the opening degree adjusting means 30 and 33 is gradually reduced. However, in the first place, the standard rotational speed is a rotational speed that generates a target wind speed in the test chamber 2 when the opening degree of the opening degree adjusting means 30, 33 is fixed to the standard opening degree. The degree of opening of the degree adjusting means 30, 33 will change around the standard degree of opening.
If the standard opening is 50%, in the normal control mode, the opening of the opening adjusting means 30, 33 will change around 50%.
That is, in the normal control mode, the rotation speed of the blower 16 is controlled to be the standard rotation speed, the actual wind speed in the test chamber 2 is monitored by the wind speed sensor 8, and the wind speed in the test chamber 2 matches the target wind speed. Thus, the opening degree adjusting means 30 and 33 are PID controlled, and the opening degree of the opening degree adjusting means 30 and 33 changes. However, in practice, when the disturbance is small, the opening degree of the opening degree adjusting means 30 and 33 changes around 50%.

  The solid line in FIG. 3B is the standard opening, and the relationship between the opening of the opening adjusting means 30 and 33 and the wind speed in the test chamber 2 when the normal control mode is executed and the disturbance is small. Is shown. As described above, in the normal control mode, the opening degree of the opening degree adjusting means 30 and 33 is changed by feedback control (PID control) so that the wind speed in the test chamber 2 matches the target wind speed, but the disturbance is small. In this case, the opening degree of the opening degree adjusting means 30, 33 converges around 50%, which is the standard opening degree.

Since the standard rotational speed varies depending on the installation conditions of the environmental test apparatus 1, it is desirable to obtain the standard rotational speed by an experiment when the environmental test apparatus 1 is trial run. The relationship between the wind speed in the test chamber 2 and the standard rotational speed and the actual numerical values are stored in the storage means of the control device 27.
Note that the solid line in FIG. 3A is a straight line of Y = 100X + 200.
The blower 16 employed in the present embodiment has a drive motor that is inverter-controlled, and the rotation speed of the blower 16 (motor) can be changed steplessly.
Further, since the rotational speed of the blower 16 has a one-to-one relationship with the target frequency in the inverter control, the target frequency of the inverter control may be stored in a storage unit (not shown) instead of the rotational speed of the blower 16.

  The transition period control mode is an operation mode that is executed when the target wind speed is changed during the test. However, the transition period control mode is not always executed when the target wind speed is changed during the test, but only when the fluctuation range of the target wind speed is large.

The amount of fluctuation in the target wind speed that is a reference for executing the transition period control mode is about 0.5 m / s to 5 m / s, and more preferably about 1 m / s to 2 m / s.
The amount of fluctuation in the target wind speed that serves as a reference for executing the transition period control mode may be changed according to the acceleration mode and the deceleration mode.

  Further, the fluctuation range of the target wind speed as a reference for executing the transition period control mode may be determined by the fluctuation ratio. For example, the new target wind speed is 5% (percent) to 50% (percent) based on the current target wind speed, and more preferably, the new target wind speed is 10% (percent) to 20% (percent) based on the current target wind speed. ).

In the transition period control mode, feedback control (PID control) of the opening degree adjusting means 30 and 33 is released and fixed at a predetermined transition opening degree. In the present embodiment, as shown in FIG. 3B, the opening degree at the time of transition differs depending on the acceleration mode and the deceleration mode. As shown in FIG. 3B, the transition opening is higher (wider) than the standard opening in the acceleration mode, and lower (narrower) than the standard opening in the deceleration mode.
It is recommended that the opening at the time of transition is about plus or minus 5% (percent) to 15% (percent) with respect to the standard opening.
In the present embodiment, the transition opening is plus or minus 10% (percent) with respect to the standard opening.
Specifically, the opening degree at the time of transition in the acceleration mode is 55%, which is 10% higher than the standard opening degree (50%), and the opening degree at the time of transition in the deceleration mode is the standard opening degree (50%). On the other hand, it is 45%, a decrease of 10%.

More specifically, in the acceleration mode, the standard opening is set to 1 and the opening is increased by 10%. That is, the standard opening is 0.5 FO with respect to the fully open FO, the opening at the time of transition in the acceleration mode is “0.5 FO (1 + 0.1)”, and the opening is 55% with respect to the fully open FO. is there.
Similarly, the opening degree at the time of transition in the deceleration mode is “0.5FO (1-0.1)”, which is an opening degree of 45% with respect to the fully opened FO.

  The ratio of the opening degree at the time of transition in the acceleration mode to the standard opening degree may be different from the ratio of the opening degree at the time of transition in the deceleration mode to the standard opening degree. For example, the opening degree at the time of transition in the acceleration mode is 53%, which is 6% higher than the standard opening degree (50%), and the opening degree at the time of transition in the deceleration mode is 12% with respect to the standard opening degree (50%). It may be 44% of the decrease.

  In the normal control mode, the opening degree adjusting means 30 and 33 are feedback controlled, so the opening degree may be 30%, for example. In this state, when switching to the acceleration mode, the opening degree that was 30% is immediately changed to 55% that is the opening degree at the time of transition, and the opening degree is fixed. Similarly, for example, in the state where the opening degree is 30%, when the mode is switched to the deceleration mode, the opening degree that is 30% is immediately changed to 45% that is the opening degree at the time of transition, and the opening degree is fixed.

In the transition period control mode, the rotational speed of the blower 16 is changed from the standard rotational speed to the rotational speed at transition.
The rotational speed at the time of transition is a rotational speed determined according to the new target wind speed.
The transition speed is higher or lower than the standard speed of the new target wind speed. Specifically, the transition speed in the acceleration mode is higher than the standard speed of the new target wind speed, and the transition speed in the deceleration mode is lower than the standard speed of the new target wind speed. .
In the present embodiment, the transition speed in the acceleration mode is 40 revolutions per minute (rpm) faster than the standard speed of the new target wind speed, and the transition speed in the deceleration mode is the new target wind speed. Compared to the standard rotation speed, it is 40 rotations per minute (rpm) slower.
In the present embodiment, the straight line indicating the rotational speed at the time of transition in the acceleration mode is a straight line of Y = 100X + 240. The straight line indicating the rotational speed at the time of transition in the deceleration mode is a straight line of Y = 100X + 160.

The transition speed in the acceleration mode may be the same as the standard speed of the new target wind speed. However, as in the present embodiment, the transition speed in the acceleration mode is higher than the standard speed. It is desirable that the rotational speed at the time of transition in the deceleration mode is lower than the standard rotational speed of the new target wind speed.
Further, the difference between the transition speed and the standard speed in the acceleration mode and the difference between the transition speed and the standard speed in the deceleration mode may be different.

  The blower 16 is controlled by an inverter and can change the rotation speed of the motor steplessly. However, in the transition period control mode, the rotation speed of the blower 16 is fixed to the transition rotation speed.

Next, the operation of the environmental test apparatus 1 will be described with reference to the flowchart of FIG.
In the present embodiment, when the air blowing environment in the test chamber 2 is stable, the operation is performed in the normal control mode as in step 1.
In the normal control mode, the blower 16 is operated with the rotational speed fixed at the standard rotational speed. And the opening degree adjusting means 30 and 33 are PID-controlled, and the wind speed in the test chamber 2 is adjusted.

That is, the blower 16 is rotated at a constant standard rotation speed, the wind speed in the test chamber 2 is monitored by the wind speed sensor 8, and the opening degree adjusting means 30, 33 are set to PID so that the wind speed in the test chamber 2 matches the target wind speed. Be controlled. When the disturbance is small, the opening degree of the opening degree adjusting means 30 and 33 changes around 50%.
In the normal control mode, the blower 16 is controlled to rotate at the standard rotation speed regardless of the actual wind speed in the test chamber 2. On the other hand, the opening adjustment means 30 and 33 change the opening so that the wind speed in the test chamber 2 matches the target wind speed.

In step 2, it is monitored whether the target wind speed has been changed during the test. When the target wind speed is set in step 2, the process proceeds to step 3 to determine whether or not the amount of fluctuation in the target wind speed is large.
If the fluctuation amount of the target wind speed is small, the new target wind speed is reached in a short time even if it is dealt with in the normal control mode, so the process returns to step 1 to maintain the normal control mode.
On the other hand, when the fluctuation amount of the target wind speed is large, it takes a long time to reach the new target wind speed if the normal control mode is used. Change from control mode to transition period control mode.

  First, in step 4, it is determined whether the change direction of the target wind speed is the ascending side or the descending side. When the change direction of the target wind speed is the ascending side, the process proceeds to step 5 and the acceleration mode is executed. On the other hand, when the change direction of the target wind speed is the descending side, the process proceeds to step 15 and the subsequent steps, and the deceleration mode is executed.

If the change direction of the target wind speed is on the rising side, the process proceeds to step 5 and the subsequent steps, and the operation mode is changed to the acceleration mode.
Then, the process proceeds to step 6 where the rotational speed at the time of transition is calculated or called from a predetermined storage means. In step 6, the speed of rotation for acceleration mode is calculated. And it transfers to step 7, the rotation speed of the air blower 16 is changed into the rotation speed at the time of transfer, and is fixed by this rotation speed.

Then, the process proceeds to step 8, and the feedback control of the opening degree adjusting means 30, 33 is stopped.
Further, the routine proceeds to step 9 where the opening degree of the opening degree adjusting means 30, 33 is changed to the opening degree at the time of transition. That is, the opening degree of the opening degree adjusting means 30, 33 is changed to 55%, which is the opening degree at the time of transition in the acceleration mode, regardless of the opening degree of the opening degree adjusting means 30, 33 so far. In step 8, since the feedback control of the opening degree adjusting means 30, 33 is stopped, the motor that operates the opening degree adjusting means 30, 33 rotates at high speed, and the opening degree of the opening degree adjusting means 30, 33 is short. It reaches 55% which is the opening degree at the time of transition within time.
In step 7, the rotational speed of the blower 16 is increased from the standard rotational speed to the rotational speed at the time of transition, and the opening degree of the opening degree adjusting means 30, 33 is secured to a certain level or more, so the wind speed in the test chamber 2 is rapidly increased. Increase and reach the new target wind speed in a short time.

If it is confirmed in step 10 that the wind speed in the test chamber 2 has reached the new target wind speed, the process proceeds to step 11 to return to the normal operation mode.
That is, in step 12, the standard rotational speed at the new target wind speed is obtained, and in step 13, the rotational speed of the blower 16 is decelerated from the transitional rotational speed to the standard rotational speed.
Furthermore, it transfers to step 14 and the feedback control of the opening degree adjustment means 30 and 33 is restarted.

The case where the target wind speed change direction is the upside has been described above, but the same operation is performed even when the target wind speed change direction is the downside.
Briefly, when the change direction of the target wind speed is the descending side, the operation mode is changed from step 4 to step 15 and the operation mode is changed to the deceleration mode.
Then, the process proceeds to step 16, and the rotational speed at the time of transition is calculated or called from a predetermined storage means. In step 16, the transition speed for the deceleration mode is calculated. And it transfers to step 17, the rotation speed of the air blower 16 is changed to the rotation speed at the time of transfer, and is fixed by this rotation speed.

Then, the process proceeds to step 18, and the feedback control of the opening degree adjusting means 30, 33 is stopped.
Further, the routine proceeds to step 19, where the opening degree of the opening degree adjusting means 30, 33 is changed to the opening degree at the time of transition. That is, the opening degree of the opening degree adjusting means 30, 33 is changed to 45%, which is the opening degree at the time of transition in the deceleration mode, regardless of the opening degree of the opening degree adjusting means 30, 33 so far.

If it is confirmed in step 10 that the wind speed in the test chamber 2 has reached the new target wind speed, the process proceeds to step 11 to return to the normal operation mode. Hereinafter, as in the case described above, the standard rotational speed at the new target wind speed is obtained in step 12, and the rotational speed of the blower 16 is decelerated from the transition rotational speed to the standard rotational speed in step 13.
Furthermore, it transfers to step 14 and the feedback control of the opening degree adjustment means 30 and 33 is restarted.

  In the embodiment described above, the opening degree adjusting means 30 and 33 are provided in the forward side air flow path 22 and the return side air flow path 25, respectively, but the opening degree adjusting means 30 and 33 are provided only in one of them. It may be what is provided. When the opening degree adjusting means is provided only on one side, it is desirable to provide the opening degree adjusting means 30 in the outgoing air flow path 22.

  Further, it may have a bypass air flow path for connecting the forward air flow path 22 and the return air flow path 25.

  In the embodiment described above, the test chamber 2 and the air conditioning unit 3 are separate bodies, but they may be integrated.

  The environmental test apparatus 1 according to the embodiment described above can control both the temperature and the humidity in the test chamber 2, but the present invention is not limited to this configuration, and the temperature or humidity can be controlled. Either one may be controlled. Furthermore, the temperature and humidity may not be controlled.

In the environmental test apparatus 1 according to the embodiment described above, when the wind speed in the test chamber 2 is changed from the current target wind speed to the new target wind speed, the opening degree of the air flow path by the opening degree adjusting means 30 and 33 is extremely narrow and constant. Limited to opening range. That is, in the environmental test apparatus 1, when the wind speed in the test chamber 2 is changed from the current target wind speed to the new target wind speed, the opening degree of the air flow path by the opening degree adjusting means 30 and 33 is fixed to a constant value. However, the present invention is not limited to this configuration, and may allow a certain range of fluctuation.
The same applies to the rotational speed of the blower 16 at the time of transition, and a certain range of fluctuation may be allowed.

In the embodiment described above, it is confirmed in step 10 that the wind speed in the test chamber 2 has reached the new target wind speed, and then the process proceeds to step 11 to return to the normal operation mode. The timing may be earlier or later.
For example, the wind speed in the test chamber 2 may be returned to the normal operation mode before reaching the new target wind speed. Further, after the wind speed in the test chamber 2 rises or falls over the new target wind speed line, the normal operation mode may be restored.

  In the above-described embodiment, the transition-time rotational speed is the rotational speed obtained by adding or subtracting a constant rotational speed to the standard rotational speed, but the present invention is not limited to this configuration, and other functions are used. It may be calculated accordingly. For example, as in the graph shown in FIG. 5A, a numerical value at a certain ratio with respect to the standard rotational speed may be used as the transition rotational speed.

  The same applies to the opening at the time of transition. In the above-described embodiment, the opening is obtained by adding or subtracting a certain opening with respect to the standard opening, but the present invention is not limited to this configuration. It may be calculated according to the function. For example, as in the graph shown in FIG. 5, a certain degree of opening relative to the standard opening may be used as the opening at the time of transition.

  In the embodiment described above, the 50% opening is exemplified as an example of the standard opening of the opening adjusting means 30 and 33. As described above, the present invention does not limit the standard opening to the 50% opening, but changes the standard opening according to the setting of the user or the target wind speed changing range frequently set by the user. Also good. For example, the standard opening may be set to 40% opening or 60% opening.

Even if the environmental test apparatus 1 is capable of creating a wide range of ventilation environments from light winds to weak winds, strong winds, and storms in the test room 2, the wind speed region frequently tested by the user is, for example, There may be a high wind speed range from strong wind to storm. In such a use environment, the standard opening is desirably higher (wider), and the standard opening may be set to around 60%, for example. In this way, when the standard opening is as high as 60%, the rotational speed of the blower 16 can be reduced, and the power consumption is reduced. Moreover, the noise of the blower 16 is also reduced.
When the standard opening degree of the opening degree adjusting means 30 and 33 is high, the opening degree at the time of transition is set to an overall high opening degree as compared with the standard case. For example, the transition opening in the acceleration mode may be 70% opening, and the transition opening in the deceleration mode may be 50% opening.

Conversely, the wind speed region frequently tested by the user may be a low wind speed region such as a light wind or a weak wind. In such a use environment, it is desirable that the standard opening is relatively low (narrow). For example, the standard opening may be set to around 40%.
When the standard opening degree of the opening degree adjusting means 30, 33 is low, the opening degree at the time of transition is set to a lower opening degree as a whole compared to the standard case. For example, the transition opening degree in the acceleration mode may be 50% opening, and the transition opening degree in the deceleration mode may be 35% opening.

  In the above-described embodiment, in the normal control mode, the opening degree adjusting means 30 and 33 are PID controlled and the opening degree is changed, but a certain degree of restriction may be provided in advance to the opening degree. For example, the change width may be limited so that the height is 20% each centered on the standard opening.

DESCRIPTION OF SYMBOLS 1 Environmental test apparatus 2 Test room 3 Air-conditioning part 8 Wind speed sensor (fan information detection means)
16 Blower 18 Air-conditioning equipment 26 Air-conditioning device 22 Forward air flow path 25 Return-side air flow path 30 Forward-side opening degree adjusting means 33 Return-side opening degree adjusting means 35, 36 PID control device

Claims (8)

Air is circulated between the test room where the DUT is installed, the blast information detecting means for detecting information related to the blast environment of the test room, the air conditioning unit, the blower capable of increasing / decreasing the rotation speed, and the air conditioning unit and the test room. An air flow path, and an opening adjustment means for increasing or decreasing the opening of the air flow path,
In the environmental test apparatus that blows the air of the air conditioning unit to the test chamber with a blower, controls the rotation speed of the blower, and the opening adjustment means to adjust the wind speed in the test chamber to the target wind speed,
There is a standard rotational speed of the blower corresponding to the target wind speed, and the standard rotational speed is a rotational speed that is assumed that the wind speed in the test chamber becomes the target wind speed when the opening degree adjusting means is set to a predetermined standard opening degree. It is possible to operate in the normal control mode in which the air speed in the test chamber is adjusted by controlling the opening adjustment means while rotating the blower at or near the rotational speed,
When changing the wind speed in the test chamber from the current target wind speed to the new target wind speed, the opening adjustment means limits the opening of the air flow path to a certain opening range and rotates the blower at a predetermined transition speed. Operation in the transition period control mode that brings the wind speed in the test chamber closer to the new target wind speed is possible, and the transition period control mode is canceled when the wind speed in the test chamber reaches the new target wind speed or reaches a certain range with respect to the new target wind speed. And an ordinary test mode.   The transition speed is different from the standard speed and is determined according to the new target wind speed. The difference between the transition speed and the standard speed is predetermined for the standard speed corresponding to the new target wind speed. The environmental test apparatus according to claim 1, wherein the environmental test apparatus is within a ratio range. Transition phase control mode has acceleration mode and deceleration mode,
The acceleration mode is a transition period control mode that is executed when the new target wind speed is higher than the current target wind speed, and the deceleration mode is a transition period control mode that is performed when the new target wind speed is slower than the current target wind speed. The opening range of the opening adjusting means in the acceleration mode is not less than the standard opening, and the opening range of the opening adjusting means in the deceleration mode is not more than the standard opening. The environmental test apparatus described. Transition phase control mode has acceleration mode and deceleration mode,
The acceleration mode is a transition period control mode that is executed when the new target wind speed is higher than the current target wind speed, and the deceleration mode is a transition period control mode that is performed when the new target wind speed is slower than the current target wind speed. 4. The environmental test apparatus according to claim 1, wherein the rotational speed at the time of transition in the acceleration mode is equal to or higher than the standard rotational speed, and the rotational speed at the time of transition in the deceleration mode is equal to or lower than the standard rotational speed. . Transition phase control mode has acceleration mode and deceleration mode,
The acceleration mode is a transition period control mode that is executed when the new target wind speed is higher than the current target wind speed, and the deceleration mode is a transition period control mode that is performed when the new target wind speed is slower than the current target wind speed. Yes, the opening range of the opening adjusting means in the acceleration mode is wider than the standard opening, and the opening range of the opening adjusting means in the deceleration mode is narrower than the standard opening,
5. The environmental test apparatus according to claim 1, wherein the rotational speed at the time of transition in the acceleration mode is higher than the standard rotational speed, and the rotational speed at the time of transition in the deceleration mode is lower than the standard rotational speed.   6. The environmental test apparatus according to claim 1, wherein the transition period control mode is executed when a difference between the current target wind speed and the new target wind speed is equal to or greater than a certain value.   The environmental test apparatus according to claim 1, further comprising a PID control device, wherein the opening degree of the opening degree adjusting means is controlled by the PID control device. An air conditioner that blows air to the test room, and includes air blow information input means for inputting information related to the air flow environment of the test room, an air conditioner, a blower capable of increasing and decreasing the number of rotations, an air conditioner, and a test room. An air flow path for circulating air between, and an opening adjustment means for increasing or decreasing the opening of the air flow path,
In the air conditioner that blows the air of the air conditioning unit to the test chamber with a blower, and controls the rotation speed of the blower and the opening adjustment means to adjust the wind speed in the test chamber to the target wind speed,
There is a standard rotational speed of the blower corresponding to the target wind speed, and the standard rotational speed is a rotational speed that is assumed that the wind speed in the test chamber becomes the target wind speed when the opening degree adjusting means is set to a predetermined standard opening degree. It is possible to operate in the normal control mode in which the air speed in the test chamber is adjusted by controlling the opening adjustment means while rotating the blower at or near the rotational speed,
When changing the wind speed in the test chamber from the current target wind speed to the new target wind speed, the opening adjustment means limits the opening of the air flow path to a certain opening range and rotates the blower at a predetermined transition speed. Operation in the transition period control mode that brings the wind speed in the test chamber closer to the new target wind speed is possible, and the transition period control mode is canceled when the wind speed in the test chamber reaches the new target wind speed or reaches a certain range with respect to the new target wind speed. And an air conditioner that executes a normal control mode.

Images