发动机起动保护电路

通过起动复合继电器、五十铃安全继电器、洋马安全继电器工作原理分析,系统介绍发动机起动保护电路,并提出了发动机保护电路新的控制方法。     

Analytical model for information flow propagation wave under an information relay control strategy in a congested vehicle-to-vehicle communication environment

Vehicular traffic congestion in a vehicle-to-vehicle (V2V) communication environment can lead to congestion effects for information flow propagation. Such congestion effects can impact whether a specific information packet of interest can reach a desired location, and if so, in a timely manner to influence the traffic system performance. Motivated by the usefulness and timeliness of information propagation, this paper aims to characterize the information flow propagation wave (IFPW) for an information packet in a congested V2V communication environment under an information relay control strategy. This strategy seeks to exclude information that is dated in the communication buffer under a first-in, first-out queue discipline, from being relayed if the information flow regime is congested. It trades off the need to enable the dissemination of every information packet as far as possible, against the congestion effects that accrue because of the presence of multiple information packets. A macroscopic two-layer model is proposed to characterize the IFPW. The upper layer is formulated as integro-differential equations to characterize the information dissemination in space and time under this control strategy. The lower layer adopts the Lighthill-Whitham-Richards model to capture the traffic flow dynamics. Based on the upper layer model, a necessary condition is derived which quantifies the expected time length that needs to be reserved for broadcasting the information packet of interest so as to ensure the formation of an IFPW under a given density of V2V-equipped vehicles. When the necessary condition is satisfied under homogeneous conditions, it is shown that the information packet can be propagated at an asymptotic speed whose value can be derived analytically. Besides, under the proposed control strategy, only a proportion of vehicles (labeled asymptotic density of informed vehicles) can receive the specific information packet, which can be estimated by solving a nonlinear equation. The asymptotic IFPW speed, the asymptotic density of informed vehicles, and the necessary condition for the IFPW, help in evaluating the timeliness of information propagation and the influence of traffic dynamics on information propagation. In addition, the proposed model can be used to numerically estimate the IFPW speed for heterogeneous conditions, which can aid in the design of traffic management strategies built upon the timely propagation of information through V2V communication.     

一种无功功率补偿器

利用AT89C52单片机设计了一种无功功率补偿器。该补偿器利用单片机AT89C52实现对数据的处理、输入和输出等功能;采用数字检测电路来获取电网中电压与电流的相位差;控制开关采用过零触发型固态继电器,使电容的投入和切除控制实现等电压投入、零电流切除;添加了光电耦合器,以便提高系统的抗干扰性;利用外接键盘实现了功率因数的人工设置。通过实时监测功率因数及分析补偿,该补偿器能够有效提高电力系统的供电质量和降低电能损耗。     

发动机起动保护电路分析与设计

分析发动机起动回路的常见故障,介绍针对起动机控制回路和主电源回路两种保护电路设计方案。通过采取这些保护措施,能有效地保护起动机,提高其使用寿命。     

主电源紧急总开关系统在重型汽车上的应用

对ADR电气控制系统的构成、各元器件的功能及优点、控制原理、工作原理以及在重型车上的应用实例等进行了详细的阐述,是国外先进技术在重型车上的一个应用。     

海洋核动力平台主变压器继电保护应用研究

本文介绍了海洋核动力平台电力系统主变压器继电保护设计的相关要求,阐述了电力变压器常见继电保护设置,结合海洋核动力平台自身特点和主变压器选型特征,分析了主变压器继电保护配置和设计要求。     

特征矩阵的主存故障检测在微机保护中的应用

在分析基于特征矩阵的主存故障检测方法原理的基础上,介绍了检测地址位及数据位故障时特征矩阵存在的条件及其确定方法．针对微机保护系统,给出了可用于其主存故障检测的特征矩阵．该检测方法原理简单,使用灵活,无需额外的设备,可有效检测到主存各种模式的故障,具有较高的准确度．     

引入导航信息与雷达互测机制的目标指令误差估计方法

摘 要;中段接力制导作战是协同作战的一种具体协同模式.提出基于平台间雷达互测机制与导航信息的目标指令参数误差估计模型.根据平台间的雷达互测机制得到的平台量测和两平台惯导设备输出的自身定位信息,在发射平台的传感器局部坐标系中表示出目标和平台的位置坐标,实现多传感器数据位置对准,并对各平台的设备偏差进行估计和补偿,消除系统误差的影响,提高了各平台的传感器测量数据精度.     

CODOG监控系统电路板自动测试技术研究

电路板自动测试技术对于舰用动力装置监控系统的故障检测与维修至关重要。以CODOG动力装置监控系统使用广泛、故障率较高的电路板RA1-01继电器输出板为例,选取BDS—9210柜式VXI自动测试设备作为测试平台,介绍RA1-01的测试程序集（TPS）的开发过程。测试结果表明：TPS故障检测率为95%,故障隔离率为80%（模糊度为4）。     

汽车用闪光继电器的无线电骚扰抑制技术

为适应国家推出的GB186 55—2002《用于保护车载接收机的无线电骚扰特性的限值和检测方法》,在分析汽车用闪光继电器工作原理及产生无线电骚扰原因的基础上,设计了2种解决方案。根据这2种方案的工作原理,在相同的条件下分别进行了电磁干扰噪声的测试。得出方案2完全符合要求,指出使用数字电路可以很好地解决开关电路引起的电磁兼容问题。