为解决自装载式混凝土搅拌车称重系统物料配比偏差问题,保证混凝土质量,提出了一种自动称重控制系统.基于真实工况数据进行FFT分析得到频谱图,设计一阶低通滤波器,滤除振动冲击误差干扰.确定系统硬件方案,提出自动化控制结构.基于CAN通讯协议实现人机交互.制定分段式预估控制策略,搭建控制模型,实现上料过程精准控制,提高自动化程度;设置清零功能,消除上料过程中累积误差.经测试验证,上水与固体物料的精度在±5 kg以内,满足精度需求,自动化程度高,成本较低且可靠性良好,对自装载式混凝土搅拌车的自动化发展具有重要意义.%The ingredients weight of concrete produced by self-loading mobile concrete mixers is not accurate at present , in order to solve this problem , an automatic weighing and control system is proposed .A kind of low-pass first order filter is designed on the base of FFT analysis of real working condition to remove the effects of vibration -impact which are unavoidable in the actual working condition .The systematic hardware is confirmed , and the archi-tecture of automatic control system is proposed which can achieve human-computer interaction by CAN communica-tion protocol;the sub-type predictive control strategy and model are made to achieve automatic weighing and assure the quality of concrete;the added reset functionality can eliminate the cumulative error in the process of feeding . Finally, the precision of adding water by the automatic weighing and control system is within ±5 kg, and the preci-sion of adding sand is within ±10 kg in the test , both of which meet requirements .The whole system has advanta-ges of simple operation , reliable running and high automation level .Furthermore , a foundation for the automation development of self-loading mobile concrete mixers was established .
展开▼
