Low-temperature working medium large-flow automatic control device and method

The invention discloses a low-temperature working medium large-flow automatic control device and a low-temperature working medium large-flow automatic control method, and aims to solve the problems that a digital display control instrument is low in feedback rate, so that the stability of the pressurization effect of a liquid oxygen pressurization storage tank and an alcohol pressurization storage tank is poor, and the digital display control instrument belongs to a single-point failure link. The system specifically comprises a main controller, an upper computer, a main power supply, a three-computer voting circuit and an electromagnetic valve power supply, the main controller comprises a voltage acquisition module, a signal processing module and a digital quantity output module; the upper computer is connected with the voltage acquisition module; the voltage acquisition module is connected with the pressure transmitter assembly; the signal processing module receives the collected voltage and sends a judgment