Micro-flow control system and method based on piezoelectric proportional valve

Abstract

The invention, which belongs to the technical field of spacecraft electric propulsion, provides a micro-flow control system and method based on a piezoelectric proportional valve. The system comprisesa valve for controlling a flow output, a controller, and a flow sensor. The valve is in an off state when no drive voltage is loaded and the flow output is zero. After a driving voltage signal outputted by the controller is received, the opening degree of the valve is controlled based on the driving voltage signal and the output flow is controlled, wherein the output flow is divided into a plurality of main path flows and a bypass flow based on a certain proportion. The flow sensor detects the flow value of the single bypass flow within an ith control period in real time, generates a flow digital signal, and inputs the signal into the controller. The controller receives the flow digital signal within the ith control period to obtain a measured actual flow and outputs a driving voltage signal for controlling the opening degree of the valve based on a control algorithm. The micro-flow control system has advantages of stable performance, flexible adjustment, and high precision.

Description

technical field [0001] The invention relates to the technical field of spacecraft electric propulsion, and is applied to the field of high-precision micro-flow propellant supply for electric propulsion systems, in particular to a micro-flow control system and method based on piezoelectric proportional valves. Background technique [0002] The electric propulsion system has the advantages of high specific impulse and high thrust accuracy, but the propellant supply flow rate is relatively small during its operation, generally mg / s. Such a small flow requirement places high demands on the propellant flow supply technology. At present, the micro-flow control method of the propellant in the electric propulsion system is mainly realized through the thermal throttle. The upstream of the thermal throttle provides a stable pressure, and then achieves a specific flow resistance by controlling the temperature of the thermal throttle. Micro-flow control. [0003] Because this method d...

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Problems solved by technology

[0005] The technical problem solved by the present invention is to overcome the deficiencies of the prior art, provide a micro-flow control system and method based on piezoelectric proportional valves, and solve the problem that the current electric propulsion system cannot realize long-term stable control of micro-flow and flexible adjustment in a wide range It has the advantages of high flow accuracy, wide flow adjustment range, long-term on-orbit flow stability, and good sealing

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