Principle of executing output signal of on-board locator
GPS remote controller is mainly composed of microprocessor chip, crystal oscillator, amplification transistor, infrared light-emitting diode and keyboard matrix.
Its operation principle is as follows: infrared emitting diode and emitting integrated circuit. When you press the key, the emitting integrated circuit will compile instructions according to your requirements, send them out through the diode, and when the game console receives the instructions, send them to the integrated circuit for decoding, and then control the corresponding equipment to perform actions. Thus, the positioning effect is achieved.
The positioner is the primary accessory of the regulating valve, which is usually used together with the pneumatic regulating valve. It bears the output signal of the regulator, and then uses its output signal to operate the pneumatic regulating valve. When the regulating valve acts, the displacement of the valve rod is reflected to the positioner through the mechanical equipment, and the valve position status is transmitted to the upper system through the electrical signal.
The positioner is the primary accessory of the control valve. It takes the valve stem displacement signal as the input response measurement signal and the controller output signal as the setting signal for comparison. When there is an error between the two, it changes the output signal to the actuator to make the actuator act, and establishes a one-to-one correspondence between the valve stem displacement times and the controller output signal. Therefore, the positioner constitutes a reaction control system with valve stem displacement as the measurement signal and manipulator output as the setting signal. The control variable of the control system is the output signal from the positioner to the actuator.
(1) it is used for important conditioning system with high requirements for conditioning quality to improve the positioning accuracy and reliability of conditioning valve.
(2) it is used for occasions with large pressure difference (△ P & gt; 1MPa) at both ends of the valve. By increasing the air source pressure, the output force of the actuator is increased to overcome the unbalanced force of the liquid on the valve core and reduce the stroke error.
(3) when the regulated medium is high temperature, high pressure, low temperature, toxic, flammable and explosive, in order to prevent external leakage, the packing is often pressed tightly, so the friction between the valve stem and the packing is large. At this time, the time lag can be overcome by using the positioner.
(4) when the regulated medium is viscous fluid or contains solid suspended solids, the positioner can overcome the resistance of the medium to the movement of the valve stem.
(5) it is used for regulating valve with large diameter (DG & gt; 100mm) to increase the output thrust of the actuator.
(6) when the interval between the regulator and the actuator is more than 60m, the positioner can overcome the transmission lag of the control signal and improve the action response speed of the valve.
(7) it is used to improve the flow characteristics of the regulating valve.
(8) when one regulator controls two actuators to implement split range control, two locators can be used to bear low input signal and high input signal respectively. Then one actuator acts in low range and the other acts in elevation, which constitutes split range conditioning.
The article comes from Jiangmen vehicle navigatorhttp://m.3w1.net
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