Including setting up system platform and measuring structure of the rigidity of pretension spring of the solenoid valve, designing the dynamic electric-current driver on the basis of power sink principal, variable pulse width modulation of voltage boosting and inversion technology, realizing the intelligence controlover the control parameters, satisfying the diversity requirement towards the dynamic feature experiment of the solenoid valve; furthermore, testing system software is developed, and filtering is conducted over the signals of armature displacement response and driving current educed from the experiment using wavelet analysis technology.
构建了系统台架和电磁阀预紧弹簧刚度测量机构，设计了基于功率吸收原理和可变脉宽升压逆变技术的电磁阀动态电流驱动器，实现了对驱动器参数的智能控制，满足了对电磁阀动态特性试验的多样性要求。开发了测试系统软件，提出了基于小波分析的方法，对试验所得衔铁位移响应信号和驱动电流信号进行了滤波。
MOTOR OPERATED VALVE, A valve using an electric motor for opening, closing and modulation.
马达操作活门，用电马达来开，关和调制的活门。
It is: the water pump connects with the intake end of the delivery pipe, the flow amount controlling valve fixes on the testing section, the vent end of the delivery pipe and the intake end of the testing section sets with same direction, the vent end-surface of the delivery pipe and the intake end-surface of the testing section sets with the waterproof sealed ring, the crack between the two end-surfaces that the thickness is matching with the frequency modulation runner, the outputting end of the transducer connects with the timing motor, the frequency modulation runner sets on the power outputting axis of the timing motor, the location of the strip hole is between the crack of the delivery pipe vent end-surface and the testing section intake end-surface.
各构件的组装方式如下：水泵与供水管的进水端连接，流量控制阀安装试验段上，供水管出水端与试验段的进水端相向安装，供水管的出水端端面与试验段的进水端端面均安装有止水密封圈，且两端面之间留有与调频转轮的厚度相匹配的夹缝，变频器的输出端与调速电机连接，调频转轮安装在调速电机的动力输出轴上，其开设有条形孔的部位位于供水管出水端端面与试验段进水端端面之间的夹缝中。
In order to achieve the fine adjustment on driving wheel braking control of the traction control system for vehicles, the high speed onoff valve of the vehicle hydraulicbrake system was analyzed, a pulsewidth modulation control rule was determined by the test, and an intelligent PWM controller was designed based on neural network PI.
为实现车辆牵引力控制系统驱动轮制动控制的精细调节，对车辆液压制动系统的高速开关阀控制进行了分析，试验确定脉宽调制控制规则，基于神经网络PI设计了TCS驱动轮制动控制的智能PWM控制器。
Pulse Width Modulation (PWM) was introduced to control the gas flow by governing the injection valve.
采用脉宽调制（PWM）方式控制天然气喷射阀的喷射量；
A pneumatic hydraulic servo system controlled by PCM (Pulse Code Modulation) is realized by a new pneumatic hydraulic cylinder and low cost switching valve.
提出了一新型气液缸和用廉价开关阀实现PCM控制的气液伺服系统。
The relations between duty ratio (D) and average current (I) is discussed, and it analyzes the flow characteristic curve of electronic-hydraulic proportional valve based on PWM (Pulse Width Modulation) control technology.
分析了占空比D与平均电流I之间的关系，并对一基于PWM控制的电液比例阀的流量特性曲线进行了分析。
Pulse width modulation PWM method was used to control the high-speed on/off valve. An open loop model of the system was used to design a PI controller to control the braking pressure.
采用脉宽调制（PWM）方法对高速开关阀进行控制，然后对开环系统进行辨识，在辨识模型基础上设计PI控制器实现对制动压力的控制。
Structure of liquid crystal modulation、principle of modulation of liquid crystal valve and merit of liquid crystal modulation in using were introduced.
设计了利用液晶调制器替代机械调制器的钽酸锂热释电实时测温系统。
According to the characteristics of vacuum modulation valve and the technological requirements of vacuum continued strip-cast process for nanocrystalline alloy magnetic powder, we designed positional model digital PID control algorithm with its integral function separated.
根据纳米晶合金磁粉真空连续片铸工艺要求和真空比例调节阀的性能，确定了积分项分离的位置型数字比例-积分-微分（PID）控制算法。
The same stable current for holding the solenoid valve closing can be achieved by different voltage of low power source and the duty cycle of pulse width modulation.
同一平衡保持电流可以通过采用不同的低压电源电压和PWM占空比实现；
The single chip produces PWM (Pulse Width Modulation) signal which is amplified by crystal triode, drives proportional solenoid, changes the position of the cone and the opening size, therefore this valve meets the flow demand.
通过单片机C8051F320输出PWM（Pulsewidthmodulation）信号，经过三极管进行功率放大，驱动比例电磁铁，改变阀芯位移，从而改变阀的开口度，得到了所需的流量。
And apply to various controlling modes to realize reliable on-off control and frequency conversion modulation for the valve and the baffle, and leave out the necessary complex mechanical structure of the actuator.
使其适用于各种控制模式，可实现对阀门挡板等的可靠的开关控制和变频调节，也省去了执行机构必须的复杂的机械结构。
This thesis focuses on exploring the approach to improve the liquid crystal valve modulation's performance and Methodology, The solution of designing timing control circuit based on CPLD is described in detail as well.
文中探索提高液晶阀调制的性能的途径和方法，并详细介绍用CPLD实现所需时基控制的解决方案。
Parameters that influence droplet sizes from the nozzle include solenoid valve modulation rate, liquid pressure, air velocity discharged from the nozzle, and spray solution physical property.
影响雾滴粒径大小的可控参数主要有电磁阀占空比、喷雾压力、喷头出口风速和喷雾药液物理特性。
Development of a PCC Based High Speed On-off Valve Driven Governor for Hydraulic Turbine The application of a PWM (pulse-width-modulation) high speed on-off valve device to an electropneumatic position servo system is presented in this paper.
基于PCC的高速开关阀控制的水轮机调速器的研制介绍一种以PWM驱动快速开关阀构成的开关型数字阀在电－气伺服系统中的应用。
Normal electromagnetic valve is used as the control valve in the study Pulse Width Modulation (PWM) method and linear optimal control principle are applied here to achieve the accurate location in walking process of pushing-pulling air-cushion platform.
本研究用普通的三位四通液压电磁开关阀作为控制阀，应用PWM脉宽调制技术，采用线性二次型最优控制原理，实现了推拉式气垫运载平台行驶过程中各种位姿的精确定位。
The overload valve is proven design concept with highly effciency and reliability to improve frequency modulation flexibility of the turbine unit.
补汽阀是一项提高机组调频灵活性、提高效率和可靠性的成熟技术。
Vacuum partial pressure control system is composed of computer system, vacuum modulation valve and partial pressure pump, of which the valve is one of key parts of the equipment.
真空偏压控制系统由计算机系统、真空调节阀、真空偏压泵等部件构成，其中真空调节阀是设备的关键部件之一。
Experimental Investigation on Parameters of Pulse Width Modulation-Holding Solenoid Valve Drive Mode
脉宽调制保持电磁阀驱动参数的研究