Design Of The Pressure Controller Of Big Containers Based On ARM

The testing of elastic component in the plane needs a test equipment to provide a variable and high accuracy pressure environment for a larger container. Most of the conventional pressure controllers for small container have the problems that the air channel's caliber is too small so that it is too slow for regulating the pressure when being in the pressure control of the big container and a long time high-frequency action will enable electromagnetic valves too large loss.This paper presents a design that based on an embedded ARM controller, with dual-channel charge-discharge gas-gas path structure and the Fuzzy-PID hybrid control.Firstly,the paper established the mathematical models of charge-discharge gas in a fixed volume of the container by studying the thermodynamic properties of air and gas flow characteristics ,and calculated the charge-discharge gas time in theory in different initial conditions,In this paper, the electromagnetic valves with good sealing performance and being able to meet the PWM modulation frequency requirements are used; and a charge-discharge gas-gas path structure of dual-channel are designed.This paper introduced a more advanced current-based piezoelectric effect of the gas line implementing agencies.and designed a Fuzzy-PID hybrid controlled according to the the characteristics of pressure control.The paper completed the hardware design of a minimum system, A/D conversion, human-computer interaction and electromagnetic valves drive circuit with Philip's ARM7TDMI-S embedded controller chip LPC2214 and programmed various functional modules of the application to complete the data collection, processing and display with integrated development tools ADS1.2. Finally ,by studying the Charge-discharge gas experiments the paper verified the pressure controller can be achieved to regulate the pressure effectively for larger volume containers and analysed the causes of error compared with the theoretical value .