Abstract
This paper introduces the closed loop pressure computer control system which is suitable for the environment of kerosene medium. The system can satisfy the technical requirements of the pressure regulation in the test of the single –jet nozzle of aero engine , the pressure can be accurately controlled and its control precision is within ±0.01MPa. It indicates the principle and composition of the hydraulic system and computer measurement and control system. The paper introduces the design method and treatment process of the key technology, which includes the use of a proportional relief valve and a fixed throttle hole in hydraulic system, the use of PID control in closed loop control system, the use of high precision sensor and measurement method by grade in measuring system and the use of 24V precision steady voltage source. In the same time it indicates the actual application of the closed loop pressure control system.
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