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随着电子科学技术的不断发展和计算机的广泛应用,在液压技术领域中逐步开始采用数字技术。例如:数字式飞行控制系统、数字式自动防滑刹车控制系统等在航空工业中已经进入实用阶段。但是,在这些系统中,仅用数字计算机或微计算机作为控制器,通过传感接口和控制接口与系统连接起来,这是一种数字-模拟混合系统,见图1。随着技术的进步,发展了直接数字控制系统(图2),推动了数字式电-液控制阀的发展。液压元件的数字化是当前液压技术的发展方向之一。从1981年第十届国际流体动力博览会上商品化的数字式电-液阀出现以来,现已取得很大进展。目前美国sperry 公司,日本东京计器公司、油研公司、丰兴工业公司和内田油压公司等的数字式电-液阀已达到商品化生产水平。微计算机把连续输出的脉冲列作为数字式电-液阀的指令,用步进马达作为电-机转换机构。阀由步进马达与阀主体组成。步进马达通过驱动器实时放大的编码脉冲数字信
With the continuous development of electronic science and technology and the widespread use of computers, digital technologies are beginning to be adopted in the field of hydraulic technology. For example: digital flight control system, digital automatic anti-skid brake control system in the aviation industry has entered a practical stage. However, in these systems, a digital-analog hybrid system, see Figure 1, is connected to the system using only a digital computer or microcomputer as a controller via a sensing interface and a control interface. As technology advances, direct digital control systems have evolved (Figure 2), driving the development of digital electro-hydraulic control valves. The digitization of hydraulic components is one of the current development directions of hydraulic technology. Great progress has been made since the advent of the digital electro-hydraulic valve, which was commercialized at the Tenth International Hydrodynamic Exposition in 1981. At present, the digital electro-hydraulic valves such as American sperry, Tokyo Keiki Co., Ltd., Yuken Co., Fung Hing Industrial Co., Ltd. and Uchida Hydraulic Co. have reached the level of commercial production. The microcomputer outputs the pulse train output continuously as the instruction of the digital electro-hydraulic valve and uses the stepping motor as the electro-mechanical conversion mechanism. The valve consists of a stepper motor and valve body. Stepper motor through the drive real-time amplification of the encoded pulse digital signal