核心器件冗余的低能耗电液伺服纠偏控制技术

针对带钢生产线广泛应用的对中(对边)纠偏电液伺服系统,现有技术能源利用效率低、易发热,核心器件伺服阀和偏差检测传感器容易发生故障,造成生产中断的不足,提出采用双伺服阀主从控制、光电传感器和电容传感器组合检测带钢偏差、两套光电传感器组合的硬件冗余检测原理,减少纠偏系统发生故障的概率,降低因纠偏设备故障,引起生产中断造成的损失.提出用变转速驱动的定量泵,配合蓄能器按压力控制方式工作,改善系统的能量效率.研究中,制定串联和并联两种偏差传感器冗余的检测原理,试验测试光电检测和电容检测两种纠偏方式的动态特性和控制精度,对比在变转速和恒定转速驱动液压泵两种方式下,纠偏过程的能量消耗情况和动态响应特性,测试连续扰动下系统的纠偏过程,研究表明,采用新的控制方案,可以在降低系统能耗70%的基础上,满足纠偏过程动静态特性的要求,达到预期目标.

Electro-hydraulic Servo Edge Position Control Technology with Low Energy Lose and Key Devices Redundancy

In view of the shortcomings of the existing technology of electro-hydraulic servo edge and center position control system extensively used in the strip production line, such as low efficiency of energy utilization, easy heat generation, and production interruption caused by easy failure of core devices servo valve and deviation sensor, the hardware redundancy control principle using two servo valves for master-slave control and combined photoelectric sensor and capacitance sensor for detection of strip deviation is proposed. With this new technology, the probability of failure of deviation rectification system is reduced, and in turn the loss caused by production interruption is decreased. To improve the energy efficiency of the system, the constan flow pump with variable speed drive, cooperated with the energy accumulator, to work in the pressure control mode is proposed. During the research, a redundancy detection principle by using both serial and parallel sensors is formulated. The dynamic and static characteristics and control accuracy of photoelectric detection and capacitance detection are tested. The energy consumption and dynamic response performance in the deviation rectification process of hydraulic pump with variable speed drive and that with constant speed drive are compared; and the deviation rectification process of system under continuous disturbance is tested. The research results show that with the new control scheme, the requirements of dynamic and static performance during deviation rectification can be satisfied on the basis of reducing 70% of system energy consumption, thus reaching the expected goal.