A Segmental Control Algorithm for Digital Valve Flow
A digital valve and flow technology, applied in the direction of flow control, flow control using electrical devices, non-electric variable control, etc., can solve the problems of control oscillation, frequent repeated opening/closing of valve position, etc., and achieve the effect of ensuring stable and precise control.
Active Publication Date: 2020-08-14
LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT
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Problems solved by technology
The PID control algorithm is used to solve the opening state of the entire digital valve. The digital valve is theoretically continuous, but it is found in engineering practice that for a given target value of certain flow rates, the valve position with a large throat will open / close frequently and repeatedly condition, it will cause control oscillation, which cannot meet the test requirements
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[0021] The present invention will be described in detail below in conjunction with the drawings.
[0022] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0023] The algorithm is converted into control software code, given the flow target value, when the feedback flow is close to the target value, the high-stage valve position adopts the expected open state, and the low-stage valve position continues to use the PID algorithm to solve the open state for control.
[0024] The detailed algorithm process is described as follows:
[0025] The first step: Obtain a given value of flow Mc_Give;
[0026] Step 2: Solve the expected opening state of the digital va...
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The invention discloses a subsection control algorithm for the flow rate of a digital valve. The digital valve is composed of sixteen venturi tubes having different calibers and an electromagnetic valve, the throat areas of the venturi tubes are arranged according to binary increment, the valve positions arranged binarily are divided into two sections for controlling, the first to eighth valve positions are of a low section, and the ninth to sixteenth valve positions are of a high section; when the controlled feedback flow rate is close to a target value, an expected opened state is adopted at the high valve positions, and the opened state of the low valve positions is solved by continuously adopting a PID (Proportion Integration Differentiation) algorithm and controlled. This technology is used first time in flow rate control of the digital valve for wind tunnel test, and solves the long-term puzzling problem that the control on some flow rate target points oscillates; and the subsection control algorithm for the flow rate of the digital valve ensures stable and accurate control of the flow rate, and makes a great contribution to the security and test efficiency of a test model and the accuracy of test data.
Description
Technical field [0001] The invention belongs to a digital valve flow control algorithm in a wind tunnel test, and is specifically a segmented control algorithm of a digital valve flow. Background technique [0002] In the wind tunnel test, a digital valve is used to precisely control the air flow. The digital valve is mainly composed of a series of solenoid valves and venturis of different diameters, and the throat area of the venturi is arranged in binary increments, and the precise control of air flow is achieved through the combination of valve positions. The PID control algorithm is used to calculate the opening state of the entire digital valve. The digital valve is theoretically continuous, but in engineering practice, it is found that for a given target value of certain flow rates, valve positions with large throats will frequently open / close repeatedly The condition will cause control oscillation, which cannot meet the test requirements. If a digital valve flow contro...
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IPC IPC(8): G05D7/06G01M9/02
CPCG01M9/02G05D7/0623
Inventor 晋荣超张平涛彭毅章荣平何清雷振华岳大鸿田鑫
Owner LOW SPEED AERODYNAMIC INST OF CHINESE AERODYNAMIC RES & DEV CENT