A pneumatic servo control system for high-altitude aircraft

Abstract

The invention discloses an air pressure servo control system with multistage cavities. The air pressure servo control system comprises a positive pressure source, a controlled cavity, control valves, etc. An air exhaust opening of the pre-stage control valve is connected to a pre-stage cavity, a negative pressure air intake is connected to a pre-stage negative pressure source, and a positive pressure air intake is connected to the positive pressure source. An air pressure outlet of the post-stage control valve is connected to a post-stage cavity, a negative pressure air intake is connected to a post-stage negative pressure source, and a positive pressure air intake is connected to the pre-stage cavity. Pressure sensors are used for detecting the air pressure of both the pre-stage cavity and the post-stage cavity and conveying the air pressure to a controller. The controller regulates and controls the control valves according to the air pressure of the controlled cavity so as to control the air pressure in the controlled cavity. The controlled cavity is divided into a pre-stage cavity and a post-stage cavity, which are controlled separately. Compared with a single-stage cavity, the multistage cavities are more stable in pressure change, so the possibility of switching the control valves by mistake is minimized.

Description

technical field [0001] The invention belongs to the field of high-altitude aircraft air pressure simulation, and more particularly relates to an air pressure servo control system for high-altitude aircraft. Background technique [0002] When a space vehicle flies in an atmospheric environment, it will be directly affected by the space air pressure environment. Using air pressure servo control technology to design the air pressure simulation equipment of the aircraft hardware-in-the-loop simulation system, through the space vehicle flight height half-in-the-loop simulation, the real flight pressure environment is introduced into the aircraft development process, which can effectively shorten the development cycle, reduce development costs, and eliminate product hidden dangers. Ensure flight stability control. [0003] The air pressure simulation system is actually a specific application of pneumatic servo control technology. The pneumatic proportional / servo control system c...

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Problems solved by technology

[0004] The pneumatic servo system in the prior art adopts a single-stage cavity system. In the low pressure range, the pumping characteristics of negative pressure sources such as vacuum pumps show a strong nonlinear change, that is, the pressure in the cavity is less than 10KPa. When the system is under negative pressure control, the response speed becomes slow, and the control valve itself is also affected by the nonlinear pressure, resulting in unstable control

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