Dual-pressure transmitter redundancy design algorithm based on air pressure prediction

Abstract

The invention discloses a dual-pressure transmitter redundancy design algorithm based on air pressure prediction. The dual-pressure transmitter redundancy design algorithm comprises a pressure judgment algorithm, an air pressure prediction algorithm and a pressure decision algorithm. According to the pressure judgment algorithm, the output pressure of the two sets of pressure transmitters is collected for multiple times in a decision-making period. Then, pressure range judgment, pressure trend judgment, multi-point average operation and effective pressure point number judgment are carried out for judging whether the pressure acquired by the pressure transmitter is effective or not, and effective pressure values P1 and P2 are given out; according to the air pressure prediction algorithm, a predicted pressure value Py after a decision period is calculated according to the received inflation time tc, the accumulated exhaust time tp, the inflation amount and the exhaust amount; according to the pressure decision algorithm, effective pressure values P1 and P2 output by the pressure judgment algorithm and a predicted pressure value Py output by the air pressure prediction algorithm are received, and system decision pressure P is output; compared with a traditional air pressure control method, the algorithm adopts two sets of pressure transmitters to test pressure in a redundant mode, and the test precision and reliability can be greatly improved.

Description

Technical field [0001] The present invention relates to the field of gas pressure control technology, in particular, a dual pressure transmitter redundant design algorithm based on air pressure prediction. Background technique [0002] In the field of gas pressure control, it is often necessary to control the pressure in the gas storage device or the cavity in the range of demand, and the principle of working is Figure 8 As shown, specifically: the pressure transmitter collects the pressure of the gas storage device, and compared to the set pressure, the gas volume charged into the gas storage device is controlled by the inflation control device by the pressure deviation as the inflation control command. The pressure of the gas storage device is within the appropriate range. [0003] The accuracy and reliability of the pressure control of the above scheme depends largely depending on the accuracy and reliability of the pressure transmitter acquisition pressure, but the pressure t...

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Problems solved by technology

[0004] First, the pressure is susceptible to external interference, especially in the electromagnetic interference environment and mechanical environmental conditions such as vibration, shock, and centrifugal. After the pressure transmitter is subjected to external interference, the output pressure data will be superimposed with large random noise and pulse noise. The signal-to-noise ratio is very low, which can easily cause malfunction or non-action of the inflation control device, which will lead to excessive or insufficient pressure of the gas storage device

[0005] The second is that the pressure transmitter may fail during the working process. For example, an electrical failure causes the output of the pressure transmitter to be lower than the electrical zero position or exceeds the range. The device cannot work as expected, and the pressure of the gas storage device is disordered and uncontrolled

[0006] How to obtain accurate and reliable pressure data has become a bottleneck that limits the improvement of the accuracy and reliability of the gas pressure control system

One way to improve reliability is to add redundant pressure transmitters and measure the pressure of the same place by two sets of pressure transmitters to realize the redundancy of the pressure test, but when the output of the two sets of pressure transmitters is inconsistent, It is difficult to judge which set of pressure transmitter data should be accepted. If the effective pressure cannot be effectively judged and identified, the two sets of pressure transmitters may reduce the working reliability

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