HS code-based negotiation with customs

List of contents of this article:

• 1,HS code-based negotiation with customs The role of the dead zone of the follow-up system
• 2, The secondary loop of the serial adjustment system is a follow-up system. What does follow-up system mean?
• 3, What is the working process of the follow-up system?
• 4, The connection and difference between the follow-up control system and the fixed value control system
• 5, Main application of servo system
• 6, What is a follow-up control system?

The role of the dead zone of the follow-up system

Deadband is sometimes also called neutral zone or non-action zone, which refers to the corresponding output to zero in the transmission function of the control system. The input signal range.

Eliminate fluctuations near the stability point, reduce frequent actions, adapt to different control objects, integrate the role of control, and improve the stability and response speed of the system. Due to the influence of the measurement accuracy and interference of the measured value, the measured value in the actual system will not really be stable at a specific value, and there will always be a deviation from the set value.

Saturation characteristics. The saturation characteristic will reduce the equivalent gain of the system under the action of large signals, oneGenerally speaking, the reduction of equivalent gain will reduce the overmodulation of the system, weaken the oscillation, and increase the steady-state error. ( 3) Gap characteristics.

It is usually called dead zone time, deadtime, which is often used to avoid false triggering when the power switch control signal is flipped. Many power management chips will control one or more external power devices, such as MOSFET or IGBT, by detecting feedback current or feedback voltage.

There is a dead zone in traditional power direction components. The traditional power direction component, also known as the power direction relay, uses the phase relationship between the line voltage and the phase current to judge the fault direction. When a three-phase metallic short circuit occurs at the protection outlet, the line voltage of the input protection is 0, and the phase comparison cannot be made, so there is a dead zone.

The secondary loop of the serial regulation system is a follow-up system. What does follow-up system mean?

is a follow-up system. The secondary loop of the serial control system is a follow-up system, which follows the output of the main controller. The secondary loop of the serial control system is a follow-up adjustment system.

Second circuit: It plays a rough role in the control process. It is a follow-up control system, which can expand the control range and strengthen the control of other key equipment. At the same time, it can provide more accurate control instructions for the main circuit to ensure the accuracy and stability of the system operation.

The secondary loop is usually a regulator or actuator, which receives control signals from the main loop and converts them into actual physical actions.In many cases, the secondary loop is a fast-response controller used to handle high-frequency disturbances in the system.

What is the working process of the follow-up system?

The follow-up control system is also known as the servo control system. Its reference input is unknown in the law of change. The task of the follow-up control system is to make the controlled quantity change according to the same law and keep the error of the input signal within the specified range.

The function of the hydraulic follow-up system of the slide valve brake is to control the lever through the spring when stepping on the pedal, so that the left end of the spring is pressed up, the piston is moved up and the conical valve is pushed open, so that the oil inlet is connected to the oil chamber. At this time, the high-pressure oil enters the working cylinder through the oil inlet, conical valve and oil outlet and brakes.

Servo system is essentially a follow-up system. It's just that the controlled quantity is displacement or its derivative of time. If you want to ask what a follow-up system is, it is the output of a system that reproduces the input signal in the fastest and most accurate way as possible. The indicators it measures include over-measurement and delay.

The follow-up control system refers to a control system whose set value is constantly changing, and the change of the set value is not known in advance, requiring the output of the system (controlled variable) to change with the set value. In this system, the output is mechanical displacement, velocity or acceleration.

The working principle of car headlight steering: At the beginning of the work, the system receives the sensor signal from the suspension device and the speed signal of the ABS system, which can judge whether the car is stationary or in a constant speed state. Once the car starts, the system begins to correct the angle of the headlights.

When stepping on the pedal, the core rod of the follow-up valve overcomes the spring resistance, moves down to open the valve (at the same time, the exhaust valve is closed), the compressed air of the storage cylinder enters the booster cylinder, pushes the putter out, drives the fork to swing, and the clutch is separated.

The connection and difference between the follow-up control system and the fixed value control system

1. According to the different set values, the automatic control system can be divided into three categories. ( 1) Fixed value control system Fixed value control system is a control system with unchanged set value. In process production, it is required that the controlled variables of the control system remain unchanged one by one production technical indicator, which is the set value.

2. The set value of the fixed value control system is fixed, and the control system can automatically overcome the influence of disturbance and keep the controlled variable basically constant.The set value in the follow-up control system is variable, and the system makes the controlled variable change with the set value.

3. Fixed value control system Fixed value control system refers to a control system with a constant set value. The function of the fixed value control system is to overcome the impact of disturbance on the controlled variable, so that the controlled variable finally returns to the set value or near the set value.

The main application of the servo system

1. Control the high-power load with a small-power instruction signal; in the absence of a mechanical connection, the input shaft controls the output shaft located in the distance to achieve long-distance synchronous transmission; so that the output mechanical displacement accurately tracks electrical signals, such as recording and fingering Indictation instrument, etc.

2. The function of the servo system of the CNC machine tool is to receive the command signal from the CNC device, drive the moving parts of the machine tool to follow the instruction pulse movement, and ensure the speed and accuracy of the action, which requires high-quality speed and position servo.

3. It is mainly used in equipment with relatively high requirements for process accuracy, processing efficiency and work reliability, such as: machinery industry: machining center, CNC punching machine, bending machine, shearing machine, PLC program controller, various automobile testing equipment, assembly equipment, welding equipment.

4. Modern communication servo systems were first applied to the aerospace and military fields, such as artillery and radar control. Gradually enter the industrial and civilian fields.

What is a follow-up control system?

The follow-up control system refers to a control system whose set value is constantly changing, and the change of the set value is unknown in advance, requiring the output (controlled variable) of the system to change with the set value. In this system, the output is mechanical displacement, velocity or acceleration.

Introduction to the follow-up control system: The follow-up control system servo control system The set value is constantly changing, and the change of the set value is not known in advance, requiring the output of the system (controlled variable) to change with the set value.

The constant value control system means that the goal to be achieved by adjusting the control is known to be fixed, and the follow-up system means that the target value to be achieved by the control system is constantly changing. The characteristic of the constant value automatic control system (also known as the automatic adjustment machine) is that the input signal is a certain constant, so it is called constant value.

The follow-up control system is also known as the servo control system. Its reference input is an arbitrary time function whose changing law is unknown. The task of the follow-up control system is to make the controlled quantity change according to the same law and keep the error of the input signal within the specified range.

The follow-up control system refers to a control system that always maintains consistency with the input signal through feedback control of the output variable when the output variable of the control object is interfered with.