The filling system realizes the networked centralized visualization of the liquid cryogenic filling operation system, which achieves the expected effect of filling, effectively avoids the damage to the equipment, eliminates the phenomenon of overloading of the tanker, effectively reduces the damage to the filling pipeline, and reduces the influence of human operation in the filling operation process. The filling system carries out global scheduling and control of each link, and according to the current state of the system, calls the GPIO module to control the valve switch. Responsible for reading the analog information connected to the system, such as temperature transmitter, pressure transmitter, etc.. Through Mod-bus protocol, it reads the weighing data information connected to the system, provides embedded database access, and is responsible for caching the peripheral values for the center control module to call.

The filling system adopts microcomputer technology, ARM control system communicating through RS485 interface, Modbus RTU protocol, through the selection of the working mode, it is possible to realize the selection of 3 working modes: preset amount, preset volume and arbitrary liquid filling. The selection of the setting of the filling process can realize the automatic switching of the self-flow mode and the pump liquid filling mode. For the setting of weight parameters, the use of intelligent judgment of weight can realize the automatic change of pre-cooling and low-temperature pump operation state under the pump refilling operation state and reach the set weight, which can effectively avoid the damage to the filling system caused by human judgment or operation error. According to the preset filling volume or amount, it automatically realizes the start-stop control of the filling system and completes the functions of accurate measurement, display, settlement and printing of the filling volume to effectively control overloading and other problems. Setting the upper and lower limits of pressure, weight, temperature and other parameters can realize the emergency cut-off function in case of abnormal state of the filling pipeline, which can effectively avoid the occurrence of accidents. It can realize the functions of inquiry and automatic totalization of the number of times of filling, the amount of filling, and the amount of filling. The automatic filling system realizes the automatic control of cryogenic liquid filling, overcomes the safety hidden danger brought by equipment defects and personnel operation errors, and ensures the safety of cryogenic liquid filling.

The automatic filling machine monitors and manages cryogenic pumps, process valves in the station and liquid filling machine, realizing the monitoring functions such as acquisition, control, display, alarm of various processes such as liquid filling and management functions such as parameter query, history record query and report printing. The parameters displayed on the control panel in real time are: pump pool temperature, pump outlet pressure, pump speed, pump running time, temperature of the gas sales machine, gas sales flow rate accumulation, etc. At the same time, the safety status of the liquid filling station is also monitored. At the same time, it monitors the safety status of the liquid filling station, adopts two-level monitoring, gives alarm through the alarm and closes the emergency shut-off valve. Liquid filling process is divided into liquid filling, pre-cooling and standby operation modes, the control system can realize automatic switching and control. The weighing system starts, stops and speeds up the cryogenic pumps for different operation modes to ensure the required speed and pressure under various operation modes and to ensure safe and efficient operation. The weighing system automatically controls the opening and closing of each process valve according to the different process operation modes.