Method for charging and discharging air as well as maintaining and controlling air pressure

Abstract

The invention discloses a method for charging and discharging air as well as maintaining and controlling air pressure. The method comprises the steps of inputting the needed target air pressure value Paim into an electronic control unit (ECU) control system by an enable keyboard; subtracting the Paim and current air pressure value Pe of a target air chamber to obtain difference, and comparing the obtained difference with the air pressure dead zone value Pd; if the difference of Paim and Pe is larger than Pd, controlling an air charging electromagnetic valve to charge air by the ECU control system which generates the corresponding pulse signal according to the duty ratio; if the difference of Paim and Pe is less than Pd, controlling an air discharging electromagnetic valve to discharge air by the ECU control system according to the duty ratio; when the absolute value of the difference of the target air pressure value Paim and the current air pressure value Pe is less than the air pressure dead zone value Pd, controlling the electromagnetic valves to stop working by the ECU control system according to the duty ratio at the moment. After the method is adopted, air charging and discharging can be carried out on the closed air chamber with any form; when the air chamber with the unknown pressure value reaches the needed air pressure value after being manually adjusted, the air chamber can be switched into an automatic control mode at any time, and the current air pressure value is maintained to be constant; the method is simple in operation and high in controllable degree.

Description

technical field [0001] The invention relates to an air pressure automatic adjustment technology of an air chamber, in particular to a servo control system and method applied to control the air pressure of a target air chamber and keep the air pressure of the target air chamber stable. Background technique [0002] At present, how to stably maintain the air pressure of the pneumatic system and how to realize the flexible adjustment of the air pressure are important problems to be solved in many pneumatic systems, especially in the product trial production link or the pneumatic system test link, the test samples are often insufficiently sealed and leak air. The phenomenon is obvious, and the difficulty of maintaining and adjusting the system air pressure is doubled. [0003] In the "Automatic Instrument" journal, Volume 28, No. 7, 2007, the author Liu Jian proposed a charging and discharging control system in the article "Design of an Intelligent Over-inflator Controller". Thi...

AI Technical Summary

Problems solved by technology

This system can carry out reasonable inflation and deflation work for specific aircraft tires through the input aircraft tire model. At the same time, the system not only has automatic control, but also has manual control function, but its manual function is only used to check whether the air circuit is normal. , so the automatic control of the system can only adapt to different types of aircraft tires, but cannot be expanded to inflate any volume of air chamber, and its manual control part cannot accurately control the inflation and deflation time

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