Now that we have grasped the concept of control, let's move on to what control really means in this textbook. This is quite important because we will mainly focus on feedback control. Therefore, the definition of feedback control in this textbook is that it is the utilization of the plant's output as the controller's input to generate control inputs for the plant. Many terms have been introduced. Let's put aside the relationship between the plant and the controller for now because we will discuss it later. If you receive control too mechanically, you will have no choice but to memorize it. So, let me start rambling again. First of all, what is a 뛰듯? In Korean, it means modeling, imitation, or simulation. We will delve into this later.

It says that it's a feedback, but actually, isn't it something like that? I messed up my midterm exam. Then, the professor called me to his research lab. It's not his office, but he asked me why I got a 5 in the exam. He said, If you keep doing this, you might end up getting pretty bad grades. If he just said one word like that, what should I do if I fail again? I feel like I might have to drop out if I fail one more time. So, I will study hard with this pressure. I think this is what they call seeding 100. So, although he talked about 4g, it's about control. It was about pulling out what you want. How will it turn out? Now, the current situation is that I got 20 points on the midterm exam, but what I want is to get 100 points on the final exam. So, there are these two differences.

Well, if I do that, from now on, I should study Ah, Gorani's study method. I will study for 12 hours a week before the exam. I will establish this method. Anyway, it's comparing the desired results. And then, the solution I came up with is Fit 100 Control. It sounds good, but it feels a bit light, so let's maybe revisit it as an example once again. I will explain feedback control and how it is applied. When it comes to feedback control, there are a few well-known examples. Firstly, cruise control, which is a system that maintains a constant speed for a car, is widely used. Or, for example, regulating the temperature in a room with an air conditioner. I prefer the air conditioner because it's summer. So, if the current room temperature is 30 degrees Celsius, and I want it to be 20 degrees Celsius, I will explain how feedback control works.

So, I mentioned that the most important thing is to control it. I said that I want to set it the way I want. So, what do I want? I want the room temperature to be between 5 and 20 degrees Celsius. So, in order to set the room temperature to 20 degrees, I will need an air conditioner. So, I will try installing an air conditioner once. I mentioned that the air conditioner controls the room temperature, and currently, the room temperature is 30 degrees Celsius. The reason I left this space empty is actually nothing special; I wanted to put the remote control here. Well, we could also manually turn on the air conditioner by going directly to it, but isn't it more convenient to lie down and do it with the remote control? So, I drew a simple chart like this. Shall we give it a try? I definitely want the room temperature to be 20 degrees Celsius now. So, I will set the remote control to 5 and 20 degrees like this.

When we press the Live Con button, it's a bit detailed to explain. It gives a miraculous signal with your finger like this. Then, from the remote control to the air conditioner, now say, Set it to 20 degrees, and the air conditioner will turn on. It will send an electrical signal. When it sends this signal, the air conditioner will turn on. Then, from here, in order to lower the temperature of the air conditioner, it will send a physical signal. Then, the temperature will change from 30 degrees. For example, let's say it becomes 25 degrees. But clearly, what did I say about controlling it? It's to make what I want. But what I want now is 20 degrees, not 25 degrees. So when it's like that, to cool down to 20 degrees, one more step is needed. What is it?

Feedback control is directly the key sensor that can be called a temperature sensor. This is about checking the air conditioner once. Then, now, the sensor was identifying the temperature of the room, and converting it into an electrical signal at 25 degrees Celsius. And then, where will this signal be sent? It will be sent directly to the air conditioner. Exactly, the current temperature in our room is 25 degrees Celsius. And I will try changing the color. The current room temperature is 25 degrees Celsius, but on the remote control, it says I want it to be 20 degrees. So, what the air conditioner does is compare them once. What I want is 20 degrees, but currently, it is 25 degrees. Then, I need to keep the air conditioner running. However, now it will continuously blow air physically, like this, towards the room. Then, what happened is that 5 degrees were reduced to 18 degrees. Too cold.

I sent out a lot of wind like this, so now the sensor reads 28 degrees, and the air conditioner sends out 18 degrees accordingly. It sends out the data value, so the air conditioner compares again. If I set the remote control to 20 degrees, but the current room temperature is 18.4 degrees, and the air conditioner stops blowing cold air, it means it won't send out cold wind anymore. So, since it's midsummer, the room temperature will gradually rise a bit, and then it adjusts back to 20 degrees. This is what we can call feedback control.

[제어공학 뽀개기] 1-3. Feedback Control of Dynamic System - Feedback Control (피드백 제어/폐루프제어)

[제어공학 뽀개기] 1-3. Feedback Control of Dynamic System - Feedback Control (피드백 제어/폐루프제어)