In closed-loop control, people usually set targets, and the detection circuit of the circuit itself realizes feedback detection data. The operation process of reaching the tracking set point is called closed-loop control. For example, the air conditioning system at home is closed-loop control, and the advanced remote control handle detects the indoor temperature to make a relatively large closed-loop control. Central air conditioning needs a higher level of closed-loop control to maintain the temperature balance of several parts.
Question 2: What do the open-loop and closed-loop of an integrated operational amplifier mean, and what do they mean respectively? The so-called "loop" refers to the "feedback loop (path)".
Usually refers to the negative feedback loop, that is, a part of the output voltage or current is led back to the inverting input terminal through a branch, and the input terminal, the input terminal and the feedback branch form a feedback loop.
In applications, operational amplifiers are generally in a negative feedback state. For example, the comparator can be used in the open-loop state and the oscillator can be used in the positive feedback state. But after the latter two, a large number of special instruments appeared, so the general operational amplifier adopts closed-loop state.
Question 3: What are open loop, closed loop and semi-closed loop, and what are their differences? Open loop means that the control quantity is not directly related to the monitoring quantity. Closed loop means that the control quantity comes from the measured value and is calculated according to the control algorithm. Semi-closed loop is the idea that the control quantity is not completely based on the result of control algorithm and participates in the control of some people.
Question 4: What are open-loop and closed-loop control systems? A control system with feedback is called a closed-loop control system. A control system without feedback is called an open-loop control system. For example, a heating control system, you don't care about the temperature, just heat it. This is an open-loop control system. If a heating control system can control heating power or heating time through temperature feedback, this heating control system is called closed-loop control system. Open-loop control system: a system that does not feed back the control results and affects the current control. For example, turn on the switch of the light-the control activity has ended at the moment after pressing the switch, and whether the light is on or not has no effect on the activity of pressing the switch; Shooting-after basketball is shot, it can't be controlled anymore. Whether the ball scores or not, the control of the ball is over in an instant. Closed-loop control system: a system that can feed back the control result and compare it with the expected value, and adjust the control function according to its error. For example, adjust the faucet-first, you have an expected flow rate in your mind. After the faucet is turned on, observe the existing flow with eyes and compare it with the expected value, and constantly adjust it by hand to form feedback closed-loop control; Riding-Similarly, the direction and speed of travel are constantly revised to form the difference between closed-loop control and open-loop closed-loop: 1, with or without feedback; 2. Whether it is applicable to the current control. Open-loop control is generally an instantaneous control activity. Closed-loop control will certainly last for some time. It can be judged that the first shot of the lens is closer to the second shot, which is also a kind of feedback but will not affect the first shot. Therefore, it is an open-loop manual control system: a system automatic control system that can only complete the control task under the direct intervention of human beings; a control system that can run according to the expected law or predetermined program without human intervention: a bicycle-manual closed-loop system, a missile-automatic closed-loop system, a manned-manual open-loop system, an automatic door, an automatic street lamp-automatic open-loop system. The closed-loop control of engine EFI system is real-time oxygen sensor, computer and fuel quantity control. The oxygen sensor "tells" the air-fuel ratio of the mixed gas to the computer, and the computer sends an instruction to the oil quantity control device to adjust the air-fuel ratio to the theoretical value (14.7: 1). This adjustment often exceeds the theoretical value, and the oxygen sensor will detect it and report it to the computer, which will then issue a command to adjust it back to 14.7: 1. Because each adjustment cycle is fast, the air-fuel ratio will not deviate from 14.7: 1. Once put into operation, this closed-loop regulation will continue. The closed-loop controlled EFI engine can always run under ideal working conditions (the air-fuel ratio will not deviate too much from the theoretical value), thus ensuring that the car not only has good power performance, but also saves fuel. Closed-loop control, the control signal is taken from the output change as the comparison quantity and fed back to the input terminal to control the input quantity. Generally, the output is opposite to the input, so it is called negative feedback control, and automatic control is usually closed-loop control. Closed-loop control is a basic concept of cybernetics. Refers to a control relationship in which the controlled output returns to the controlled input in some way and exerts control influence on the input. In cybernetics, closed loop usually means that the output end feeds back to the input end through "side chain", which is called closed loop control. The output end feeds back to the input end and participates in the re-control of the output end. This is the purpose of closed-loop control, which is achieved through feedback. Positive feedback and negative feedback are two common basic forms of closed-loop control. Among them, from the perspective of achieving the goal, negative feedback and positive feedback have the same meaning. From the specific way of feedback realization, both positive feedback and negative feedback belong to the "addition and subtraction" feedback mode in algebraic or arithmetic sense, that is, after the output is fed back to the input, it is integrated with the input, and then used as a new control output to further control the output. In fact, the feedback from output to input is far more than these ways. This is manifested in: in operation, it includes not only addition and subtraction, but also a wider range of mathematical operations; In the feedback mode, the output does not necessarily need to be integrated with the input to form a unified control output, and the output can be directly controlled by the control chain. Closed-loop control has specific performance in various control examples, such as the above-mentioned automobile engine combustion control.
Question 5: What are closed-loop control system and open-loop control system? What's the difference? Closed-loop control has a feedback link, which can improve the accuracy of the system and shorten the response time, and is suitable for systems that require high response time and stability. Open-loop control has no feedback link, so the stability of the system is not high, the response time is long, and the accuracy is not high, so it is used for simple systems with low requirements on system stability and accuracy.
Question 6: What are open-loop systems and closed-loop systems? Open loop: the controlled object of the system is directly output from the input end to the output end.
Closed loop: the output (controlled quantity) of the controlled object of the system is fed back to the input end, which affects the output of the controller and forms one or more closed loops.
The closed-loop control system has positive feedback and negative feedback. If the feedback signal is opposite to the given value signal of the system, it is called negative feedback, and if the polarity is the same, it is called positive feedback.
for instance
Open loop: CPU fan! Power supply speed monitoring only (no monitoring)
Closed loop: proportional amplifier circuit of the motor control circuit of optical drive. . Many are everywhere.
Positive feedback includes oscillator circuits, such as radio, TV, local oscillator circuit, display switching power supply, etc.
Question 7: What do you mean by open-loop and closed-loop cars? To put it bluntly, open loop means that ECU only collects signal data and does nothing else. The closed loop not only collects data, but also controls and adjusts the actuator according to the data.
Question 8: What's the difference between an open-loop system and a closed-loop system? Open-loop system refers to the control system whose input signal is not affected by the output signal. In other words, the control result will not be fed back to the system that affects the current control.
Closed-loop system is complex, and the output is directly or indirectly fed back to the input, so the system that forms closed-loop participation control is called closed-loop control system. Also known as feedback control system.
In order to realize closed-loop control, it is necessary to measure the output, feed the measurement results back to the input, subtract the deviation from the input, and then directly control the deviation to eliminate it. The whole system forms a closed loop.
For the closed-loop system of automatic control system, the input of any link can be fed back by the output. When the input of the control device is fed back by the output, the system is called full closed-loop system, or simply closed-loop system.
Question 9: How to distinguish open-loop and closed-loop open-loop control systems, also known as feedback-free control systems. The open-loop control system consists of a controller and a controlled object. The controller usually has a power amplification function. If there is no feedback between the output and input of the system, that is, the output of the control system has no influence on the control of the system, such a system is called open loop.
Closed-loop control is a basic concept of cybernetics. Refers to a control relationship in which the controlled output returns to the controlled input in some way and exerts control influence on the input. The output end feeds back to the input end and participates in the re-control of the output end. This is the purpose of closed-loop control, which is achieved through feedback.