共查询到18条相似文献,搜索用时 156 毫秒
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王强 《仪表技术与传感器》2018,(8)
针对传统的电磁阀检测装置操作复杂、精确度低等问题,设计了一种新型电磁阀检测系统。该系统以嵌入式微处理器STM32为控制核心,硬件部分包括数据采集电路、数据处理电路、串口通信电路等。通过电磁阀的吸合实验来采集传感器组输出的电压、电流信息,通过相关算法推算出电磁阀的工作状态,最终把测量结果通过RS232通信方式发送到上位机实时显示。实际实验结果表明,设计的电磁阀检测系统操作简单、响应速度快。 相似文献
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喷气织机电气控制新概念 总被引:1,自引:0,他引:1
1引言喷气织机是无梭织机的一种,它具有生产效率高,织造的产品种类较多的特点。但其工艺要求较高,整机动作具有很强的协调性,控制系统比较复杂。目前,我国国内织机生产厂商所制造的喷气织机多长期采用国外技术,其电气控制系统也主要依赖于从国外进口,由此造成生产成本难以下降,供货时间无法保证,直接阻碍了产品的销售。为改善这一状况,诸多生产厂家及相关研究部门多年来在喷气织机电气控制系统国产化方面做了大量工作。其主要方式为完全模仿国外喷气织机的控制方式,即采用多个单片机系统完成整个织机系统的动作控制和数据运算。… 相似文献
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针对现阶段国产喷气织机可靠性差、能耗大、品种适应性低等问题,设计了一种以STM32F439为主控制器,FPGA芯片为引纬控制器的双核宽幅喷气织机嵌入式控制系统。根据喷气织机织造原理,将硬件控制系统进行模块化设计,分为主控制器与引纬控制器两大硬件管理系统并将其通过FMC通道联系。结合织机工艺圆时序配合,在有限状态机原理的基础上确定织机状态迁移策略,提高控制系统可靠性,利用FreeRTOS任务调度机制保证多任务的有序执行,提高系统实时响应能力。软硬件测试验证了在高转速下该系统能够保持540cm宽幅织造功能,实时响应性能良好,提高了喷气织机的品种适应性。 相似文献
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The methods of improving the dynamic performance of high speed on/off solenoid valve include increasing the magnetic force of armature and the slew rate of coil current, decreasing the mass and stroke of moving parts. The increase of magnetic force usually leads to the decrease of current slew rate, which could increase the delay time of the dynamic response of solenoid valve. Using a high voltage to drive coil can solve this contradiction, but a high driving voltage can also lead to more cost and a decrease of safety and reliability. In this paper, a new scheme of parallel coils is investigated, in which the single coil of solenoid is replaced by parallel coils with same ampere turns. Based on the mathematic model of high speed solenoid valve, the theoretical formula for the delay time of solenoid valve is deduced. Both the theoretical analysis and the dynamic simulation show that the effect of dividing a single coil into N parallel sub-coils is close to that of driving the single coil with N times of the original driving voltage as far as the delay time of solenoid valve is concerned. A specific test bench is designed to measure the dynamic performance of high speed on/off solenoid valve. The experimental results also prove that both the delay time and switching time of the solenoid valves can be decreased greatly by adopting the parallel coil scheme. This research presents a simple and practical method to improve the dynamic performance of high speed on/off solenoid valve. 相似文献
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High-pressure solenoid valve with high flow rate and high speed is a key component in an underwater driving system.However,traditional single spool pilot operated valve cannot meet the demands of both high flow rate and high speed simultaneously.A new structure for a high pressure solenoid valve is needed to meet the demand of the underwater driving system.A novel parallel-spool pilot operated high-pressure solenoid valve is proposed to overcome the drawback of the current single spool design.Mathematical models of the opening process and flow rate of the valve are established.Opening response time of the valve is subdivided into 4 parts to analyze the properties of the opening response.Corresponding formulas to solve 4 parts of the response time are derived.Key factors that influence the opening response time are analyzed.According to the mathematical model of the valve,a simulation of the opening process is carried out by MATLAB.Parameters are chosen based on theoretical analysis to design the test prototype of the new type of valve.Opening response time of the designed valve is tested by verifying response of the current in the coil and displacement of the main valve spool.The experimental results are in agreement with the simulated results,therefore the validity of the theoretical analysis is verified.Experimental opening response time of the valve is 48.3 ms at working pressure of 10 MPa.The flow capacity test shows that the largest effective area is 126 mm2 and the largest air flow rate is 2320 L/s.According to the result of the load driving test,the valve can meet the demands of the driving system.The proposed valve with parallel spools provides a new method for the design of a high-pressure valve with fast response and large flow rate. 相似文献
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电磁开关阀是阀控液压系统中重要的基础流控原件,其开关特性决定系统整体性能。传统驱动方式下,阀芯位移响应滞后于励磁驱动电流,阻碍频响的提高。提出通过建立位移反馈提升阀芯在阶跃励磁电流作用下的电磁力的响应特性,进而提升电磁阀位移频响的方法。对二位二通电磁开关阀建立了动力学与电磁学方程,搭建了阀芯电磁-动力学关键参数测量装置。试验验证了试验装置可行性并获得了阀芯位移响应的开环传递函数。结合试验数据,在Simulink中搭建了反馈对电磁开关阀开关特性影响的验证系统。仿真结果表明,通过利用电磁阀位移反馈,阀芯位移对励磁线圈的阶跃响应改善显著,响应时间相比开环阀芯驱动缩短了近53%。 相似文献
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在普通脉宽调制(PWM)信号驱动下,高速开关电磁阀的开启和关闭时间较长,反应慢,影响了高速开关电磁阀的控制性能。为了进一步提高高速开关阀的控制性能,在分析高速开关阀工作特性的基础上,提出了多路混合驱动方法,缩短了高速开关阀的开启和关闭时间,减小了压力控制时的压力波动,改善了高速开关阀的控制性能。在汽车离合器起步控制中,使用该方法很好地改善了汽车的起步性能,发动机转速比较平稳,从动盘转速增加趋势的波动较小。 相似文献
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基于PWM控制的高速开关电磁阀在汽车防抱死制动系统中的应用 总被引:1,自引:0,他引:1
在汽车防抱死制动系统(简称ABS)的控制过程中,一般是由电子控制单元控制二位三通的高速开关电磁阀来实现制动轮缸的压力增压、保压和减压三种状态的控制.为了提高系统的响应速度和控制精度,研究采用PWM控制高速开关电磁阀的液压制动式防抱死制动系统,分析了PWM控制原理、高速开关电磁阀的工作特性以及高速开关电磁阀在汽车防抱死制动装置中的具体应用. 相似文献