基于AMESim的高速大流量电磁阀动态特性仿真研究

在对电磁阀的结构以及工作机理进行分析的基础之上,采用AMESim仿真软件建立电磁阀的动力学模型进行,进而研究出线圈驱动电压、匝数、主工作间隙、气源压力、活塞直径、排气阀座直径以及反力因素等对电磁阀响应特性的影响,从控制角度提出改善电磁阀动态特性的思路。     

电磁阀自保持功能的分析与设计

电磁阀的结构简单,动态相应特性良好,因此被广泛地应用到工业控制的各个领域中。电磁阀内部的动铁在线圈产生的吸力与弹簧力的作用下进行运动并保持在相应的位置。动铁运动过程中电磁阀线圈做功,而靠电磁力保持时,线圈不做功,线圈将所有的电能转化为热能,造成温度升高等各种问题,所以有必要控制动铁保持时线圈的功耗。根据驱动电压类型电磁阀可分为直流电磁阀、交流电磁阀两种。交流电磁铁在动铁吸合到位保持的过程中,电流和功耗会自动减小,而直流电磁阀则需要通过优化驱动电路或整体结构改进的方法实现功耗及发热控制。     

汽车变速箱换挡比例电磁阀的磁场仿真研究

双离合(DCT)变速箱换挡比例电磁阀通电磁化铁芯,使其在电磁吸力的作用下推动阀芯使阀口实现不同开度,以此来对应不同的换挡油路进而实现换挡。通过理论分析了静态电磁力特性曲线、动态电流特性曲线与电磁阀换挡精度和开启时间的关系。采用有限元法对电磁阀建立磁场分析的静态和动态数值模型,并利用Ansoft Maxwell软件进行仿真,研究电磁阀的线圈匝数、隔磁槽位置以及动铁芯厚度等结构参数分别对静态电磁力特性和动态电流特性的影响,为此类电磁阀的设计与研究提供参考。     

高速电磁阀在电动喷油系统中的应用

为改善柴油机的电喷效果,将高速电磁阀应用到喷油系统,对其电磁力的变化规律和磁场瞬态特性展开研究.通过电磁阀动态响应试验,研究高速电磁阀和传统电磁阀的电磁力在不同线圈电流下的变化特性、不同气隙下的电磁力变化规律以及不同磁环高度下的电磁力变化规律,计算运动条件下的磁通特性和磁力响应.研究结果表明,高速电磁阀对磁力的响应控制效果更佳,在保证热功率正常的情况下,可在一定范围内增大电流极值,提升工作稳定性.     

超洁净电磁阀动态特性仿真与优化

为了满足半导体和化工领域等对超洁净流体控制的新需求,针对一种新型超洁净电磁阀开展动态特性仿真与优化。首先介绍其工作原理,并利用COMSOL_Mutiphysics软件对其进行有限元仿真,得到其动态响应特性曲线。然后分析了电磁阀的线圈匝数、工作间隙和衔铁厚度对其响应特性的影响。最后利用遗传算法对电磁阀进行动态响应的多目标优化,可以得到其优化后电磁阀的吸合时间由原来的10.4 ms缩短至9.2 ms,降低了11.5%;释放时间由9.5 ms缩短至8.0 ms,降低了15.7%。超洁净电磁阀的响应特性得到一定改善,为以后的优化设计提供指导。     

基于Ansoft的永磁式电磁阀优化设计

利用电磁场有限元分析软件Ansoft Maxwell对永磁式电磁阀进行二维仿真建模。从电磁阀的结构出发,对影响电磁阀高速响应特性的线圈匝数、铁芯宽度、气隙等各种关键参数进行静态、动态仿真分析计算,通过结果对比选出合适的参数,大大提高电磁阀的制造经济性以及快速响应性。     

共轨式柴油机用高速电磁阀特性研究

高速电磁阀是柴油机共轨式喷油系统的的电磁静态吸力与线圈电流和线圈与电磁阀衔铁之间间隙的关系.通过自主开发电磁阀特性测试系统,对多种共轨式喷油器用电磁阀的特性进行测试,并对测试结果进行了分析.     

高速电磁阀线圈与阀体配合气隙对电磁吸力影响研究

以制动系统液压控制单元中的高速开关阀为研究对象，研究了线圈与电磁阀配合气隙对电磁阀保压性能的影响。建立相关数学模型，对电磁阀保压工作状态的进行仿真，根据仿真模型结果对线圈与电磁阀配合气隙对电磁阀保压特性影响做相关研究。设计了保压实验来验证线圈与配合对电磁阀保压能力的试验，结果证明了理论正确性及模型在电磁阀工程设计中应用的可行性。     

连续供墨式电磁阀设计及其铁芯受力与运动分析

主要研究连续供墨式电磁阀,设计了其结构,推导了其中螺线管线圈的电磁力计算公式,在ANSYS Maxwell软件中建立了电磁阀模型并对其动态特性进行了仿真模拟,模拟结果表明气隙与电磁力成反比、漆包线线径与电磁力成正比的关系,根据模拟及计算数据设计了喷头,通过实验喷头可以长时间正常运行。     

起重机用电磁阀线圈技术及测试

电磁线圈是电磁阀的必要组成部分,其性能结构特性对电磁阀至关重要。本文重点分析了线圈工作特性中正常工作电压与环境温度的关系,详细阐述了电磁线圈的测试标准及测试程序。     

Dynamic performance of high speed solenoid valve with parallel coils

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.     

气动电磁阀开启过程的动态响应特性

以二位三通气动电磁阀为研究对象,详细介绍了其工作机理并对磁路进行理论分析。通过ANSYS Maxwell软件建立其二维电磁场分析有限元模型,并进行瞬态运动仿真计算,分析多电磁参数(主气隙宽度、铁磁材料、动铁芯直径、弹簧预紧力、刚度以及线圈加载方式)对电磁阀瞬态响应特性的影响。搭建实验平台,测试线圈加载方式对电磁阀瞬态响应特性的影响,进一步验证了仿真分析的准确性。为类似电磁类产品的设计研发提供了充实的理论依据。     

高速电磁阀电磁铁的研究与开发

针对高速电磁阀快速响应的关键因素电磁铁电磁力大小与线圈驱动两方面的问题。对电磁铁铁芯形状、工作气隙相对于线圈位置、工作气隙大小、安匝数、圆形铁芯面积等因素影响电磁力进行了分析研究;提出了3种驱动电路,对3种线圈驱动电路影响电磁铁响应特性进行了对比,并运用Ansoft Maxwell软件对各因素与电磁力大小的关系、3种线圈驱动电路与电磁铁响应特性进行了模拟仿真计算,最后对电磁铁的开发提出了一种优化方案。研究结果表明,该优化方案对高速电磁阀的快速响应有一定的提升。     

基于电流调制的电磁开关阀开关特性研究

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%。     

Detecting the position of the moving-iron solenoid by non-displacement sensor based on parameter identification of flux linkage characteristics

Currently, most researches use signals, such as the coil current or voltage of solenoid, to identify parameters; typically, parameter identification method based on variation rate of coil current is applied for position estimation. The problem exists in these researches that the detected signals are prone to interference and difficult to obtain. This paper proposes a new method for detecting the core position by using flux characteristic quantity, which adds a new group of secondary winding to the coil of the ordinary switching electromagnet. On the basis of electromagnetic coupling theory analysis and simulation research of the magnetic field regarding the primary and secondary winding coils, and in accordance with the fact that under PWM control mode varying core position and operating current of windings produce different characteristic of flux increment of the secondary winding. The flux increment of the electromagnet winding can be obtained by conducting time domain integration for the induced voltage signal of the extracted secondary winding, and the core position from the two-dimensional fitting curve of the operating winding current and flux-linkage characteristic quantity of solenoid are calculated. The detecting and testing system of solenoid core position is developed based on the theoretical research. The testing results show that the flux characteristic quantity of switching electromagnet magnetic circuit is able to effectively show the core position and thus to accomplish the non-displacement transducer detection of the said core position of the switching electromagnet. This paper proposes a new method for detecting the core position by using flux characteristic quantity, which provides a new theory and method for switch solenoid to control the proportional valve.     

A study on the design and application of optimized solenoid for diesel unit injector

With the Environmental Protection Agency (EPA) regulating the amount of NOx, Particulate, HC and CO at all driving conditions, emission standards for diesel engines are becoming more stringent than ever. To meet future emission regulations, researchers have proposed two solutions based on injection control, the common-rail type injection system, and the unit injection system. Most researchers agree that the electronically controlled unit injector, which realizes high injection pressure and precise control of SOI (Start Of Injection) and injection quantity, has an advantage in meeting future emission regulations. In order to control the start and end of injection, each unit injector contains a time-controlled high speed solenoid valve. Thus, the fuel injection quantity is determined by the time interval between closing and opening of the solenoid valve. This study introduces a method for the design of the solenoid which is installed in the unit injector. It is shown that there are certain significant parameters to be optimized to improve solenoid performance: inductance, stroke, input voltage, coil resistance, load and switching time.     

混合动力变速箱中比例电磁阀变频控制研究

脉宽调制技术（PWM）依靠改变频率和占空比形成不同的目标电流,广泛用于比例电磁阀的驱动。但由于受到比例电磁阀磁路特性和脉宽调制技术的双重制约,使得比例电磁阀各项性能难以发挥,甚至影响整个液压系统的平稳运行。因此,根据目标电流变化以及控制环境不同而改变PWM频率的控制方法被用于驱动比例电磁阀。试验结果证明：使用变频的控制方法在维持比例电磁阀输出电流稳定的前提下,缩短了电流响应时间,维持了阀芯小幅颤振,降低比例电磁阀的功率损耗。     

ABS高速开关阀液压力影响因素研究

高频小流量高速开关阀用于汽车防抱死制动系统 (ABS)增压与减压的控制,在不同温度环境下,其可靠的动态特性是ABS正常工作的重要指标。高速开关阀阀芯高频运动过程中,主要受到电磁力、液压力等因素的影响。针对液压力,建立高速开关阀不同温度、阀口两端压差、阀口开度的有限元仿真模型,分析温度、阀口两端压差和阀口开度不同时,高速开关阀液压力的变化规律。仿真结果得知,在相同的阀口开度和压差下,液压力随温度的升高而减小;阀口开度越大,液压力受温度的影响越大;同一压差和温度下,液压力随阀口开度的增大而减小。通过探寻温度、阀口两端压差及阀口开度大小对高速开关阀液压力的影响,为准确研究高速开关阀动态特性提供理论依据,从而为提高汽车ABS响应特性奠定理论基础。     

线性测微电感的精化

为提高测微电感传感器的测量精度,提出了基于赫姆霍兹线圈理论设计螺线管线圈的方法,改善了螺线管线圈内轴向上磁场的分布均匀性。首先,分析了螺线管线圈模型,建立了螺线管线圈参数与轴向磁场强度分布相互关系的广义函数模型。然后,通过线圈与磁芯的尺寸确定了系统轴向磁场强度分布函数模型,结合磁芯移动区间范围设置磁场均匀度最小误差目标函数,通过对目标函数寻优得到各螺线管线圈的各项参数。最后,搭建了测微电感传感器的测试系统,测试了传感器性能。实验结果表明:与传统线圈相比,改进型螺线管线圈在100μm测量范围内的线性度由0.46%提高到0.30%。实验显示通过对不同规格的螺线管线圈进行组合,可使得螺线管内轴向上磁场强度分布均匀,从而提高了测量精度。     

考虑电磁特性的电磁开关阀动静态性能仿真研究

为研究电磁特性下电磁阀的动静态性能,针对设计中使用到的电磁开关阀,首先分析了电磁铁的结构参数和电磁开关阀动力学模型,然后应用Ansoft Maxwell和AMESim建立了电磁开关阀仿真模型,对不同占空比以及不同频率下的脉宽调制(PWM)输入控制信号进行了仿真,分析了其动态响应过程及静态性能(空载流量、空载压力等),最...