The control of hydraulic cylinders with digital hydraulic valves is often based on modulation principles like pulse-width modulation, pulse-code modulation, or pulse–frequency control. In many cases the dynamic drive performance using such control strategies is far below the natural dynamics of the system, since closed-loop controllers demand a certain phase margin for stability. However, some drive applications require a high dynamic response, which cannot be realized with common closed-loop concepts. In this article the design of a bang–bang feedforward control with regard to the dynamics of a hydraulic cylinder drive in accordance with the theory of optimal control is presented. The control achieves the maximum physical dynamic response and no remaining oscillations after the movement, which forms the basis of a high dynamic three-level position control for hydraulic drives. Furthermore, the influence of valve dynamics and pipe line dynamics with regard to the design of the digital valve control are considered by simulations.

带有数字液压阀的液压缸的控制通常基于调制原理，如脉宽调制、脉冲编码调制或脉冲频率控制。在许多情况下，使用此类控制策略的动态驱动性能远低于系统的自然动态，因为闭环控制器需要一定的相位裕度以确保稳定性。然而，一些驱动应用需要高动态响应，这是普通闭环概念无法实现的。在本文中，根据最优控制理论，介绍了关于液压缸驱动动力学的 bang-bang 前馈控制的设计。控制达到最大物理动态响应，运动后无剩余振荡，它构成了液压驱动的高动态三级位置控制的基础。此外，通过仿真考虑了阀门动力学和管道动力学对数字阀门控制设计的影响。