阀泵联合大功率液压调速方案分析

为进一步提高其控制性能，在对比分析目前阀泵串联、并联控制方案的结构、工作原理及特点的基础上，提出了阀泵并联分时变结构调速方案-控制结构依调速要求而变、阀控与泵控分时参与、协调控制，并分为补油式与泄油式两种形式，应用于煤矿液压提升机，可形成补油式/泄油式阀泵并联分时变结构液压提升机，同时对比分析了这两种形式各自的特点。阀泵并联分时变结构调速方案，建立了调速方式依调速要求而变的灵活的控制机制，将丰富液压系统的控制方式，有望解决大功率液压调速系统中效率与响应的矛盾，并兼顾系统的低速稳定性和加减速平稳性。

Analysis of valve-pump combined high power hydraulic speed regulation schemes

To improve control performances of this combined control system，current construction，control principle and performance of valve-pump parallel control schemes and valve-pump series control schemes were analyzed，then a scheme of valve-pump parallel speed servo with time-sharing variable structure was proposed，its control principle was that control structure varies with speed control requirement，pump and valve time-sharing participate and coordinated control.The scheme includes two types：replenishing and leaking，a valve-pump parallel control hydraulic hoist with time-sharing variable structure in replenishing manner and in leaking manner were developed when the scheme was applied to the hydraulic hoist.Finally，characteristics of the two control manners were also contrastively studied，which would provide basic theory for selection and parameters configuration for valve-pump combined control system.The time-sharing variable structure control scheme establishes a flexible control mechanism that control structure can vary with control requirement in a speed regulating process.It will enrich the control manner of hydraulic servo system，and probably solve the contradiction between efficiency and response of high power hydraulic control system，also gives consideration to the speed stability in stage of start-up.