CNG汽车气瓶自动装卸系统设计

Design of a control system for auto loading and unloading of compressed natural gas bottles

为了解决压缩天然气（compressed natural gas，CNG）汽车加气难的问题，提出了CNG“集中灌装、分散换瓶”的天然气汽车加气理念。采用可编程逻辑控制器（programmable logic controller，PLC）作为智能控制单元、步进电机作为装卸驱动单元，设计了可移动的三维工作台作为装卸平台。研究了步进电机的控制算法，构建了CNG汽车气瓶自动装卸系统模型，研制了专用的车用CNG气瓶自动装卸系统。理论分析和实验结果表明：该系统可以在1～2min内完成CNG汽车气瓶自动装卸任务，提高了CNG汽车的加气效率。

The concept of centralized filling and separate bottle displacement was introduced to reduce the inconvenience of filling compressed natural gas（CNG） vehicles. By taking a programmable logic controller （PLC） as the smart control unit and stepper motors as drive units, a mobile three-dimensional table was designed as a working platform. The stepper motor control algorithm was studied, and the system model for the CNG vehicle＇s automatic loading and unloading was constructed. A new automatic loading and unloading system for CNG vehicle bottles was developed. Theoretical analysis and experimental results show that the system can complete the automatic loading and unloading task in 1 or 2 minutes, thereby improving CNG vehicle filling efficiency.