电控直列泵-管-阀-嘴(PPVI)柴油喷射系统的研究

电控直列泵－管－阀－嘴（ＰＰＶＩ）柴油喷射系统是在综合各种电控柴油喷射系统特点的基础上形成的对机械式直列泵－管－嘴系统实现电子控制的新型系统，本文分析了电控直列泵－管－阀－嘴柴油喷射系统的结构和工作原理，设计和开发了满足该系统工作要求的控制装置，通过试验验证了电控喷射系统工作的可行性。研究了一些结构和调整参数对系统性能的影响，试验结果表明该新型电控喷射系统具有较好的综合控制性能。     

新型电控柴油喷射系统的仿真模型与参数优化

电控泵－管－阀－嘴（PPVI）柴油喷射系统是一种新型的电磁阀溢流控制式直列泵供油系统,在此前已建立其物理与数学模型的基础上,利用SIMULINK软件,建立了系统的仿真计算模型。根据该模型对系统 计算机辅助仿真计算,经与油泵台试验结果的对照表明,使有该模型可以方便灵活地对系统参数进行优化匹配,为电控泵－管－阀－嘴系统的深入研究提供了有效的工具。     

电磁阀溢流控制式脉动喷油系统的数理模型与参数优化

电磁阀溢流控制式脉动喷油系统主要指的是电控单体泵、电控泵喷嘴、电控分配泵和电控泵－管－阀－嘴等4种系统。这些系统具有相同的工作机理。在建立此类新系统物理模型的基础上,通过使用MATLAB软件,建立了系统的仿真数学模型。根据该模型,对系统进行了计算机辅助仿真计算,与喷射系统的油泵台试验结果对照表明,使用该模型可以方便灵活地对系统参数进行优化匹配,为此类电控喷射系统的深入研究提供了有效的工具。     

高速强力电磁阀在柴油机电喷系统中的应用研究

介绍了电控泵－管－阀－嘴（ＰＰＶＩ）柴油喷系统中高速强力磁阀的研制和相应的电控单元的工作过程。采用高频脉宽调制（PWM）波对高频斩波电流源驱动电路进行控制实现强力电磁阀的驱动,分析了电磁阀的动态响应特性,给出了电磁阀实现稳定位移输出的控制方法,分析了喷射过程。给出了射控制和电磁阀时间控制的软件和硬件实现方法。     

电控PPVI柴油机喷射系统参数匹配

本文介绍了新型电控直列泵－管－阀－嘴柴油机的喷射系统参数对燃烧过程的影响。对不同的启喷压力,不同的电磁阀位置,不同的油管长度,不同的喷油器及不同的柱塞直径,在１２００－２８００ｒ／ｍｉｎ范围内,及脉宽１０℃Ａ条件下,进行了匹配试验,经过分析,得到了这种燃油喷射系统的较佳能数组合。     

多缸二甲醚发动机电控单元软件的研究

介绍了一种适合二甲醚DME代用燃料的电控PRVI（泵-轨-阀-嘴）喷射系统,并根据二甲醚的性质特点研究开发了系统电控单元的管理模块、控制模块和计算机监控系统。通过在油泵试验台上的燃油喷射试验,验证了控制软件的实时性和精确性。     

电控燃油喷射系统液力稳定性试验研究

针对电控泵－管－阀－嘴（ＰＰＶＩ）燃油喷射系统研制过程中出现的液力波动现象,通过观察系统内压力波的形成与传播,分析了产生液力波动的原因,发现主喷射段后存在由于空穴破裂引起的残余压力波,此残余压力波是直接导致系统液力波动的主要原因。最后,利用节流片成功地消除了压力波动现象,实现了系统的液力稳定。     

转子发动机电控喷油系统设计

针对某转子发动机的电控喷油系统进行开发研究,以MSP430单片机为核心,设计电控单元的电源、信号处理和喷油驱动等模块的硬件电路,采用程序模块化思想设计电控单元的软件程序,并对电控单元的功能进行半物理试验调试。结果表明:设计的电控喷油系统能够实现对传感器信号的实时测量和计算,并能够根据相应的控制策略输出正确的控制信号。     

新型脉动式电控燃油喷射系统喷射定时优化

电子控制是柴油发动机燃油喷射系统实现柔性喷射过程控制的有效途径。喷射定时对发动机的排放和经济性都有重要影响，传统的机械式供油系统无法兼顾对每一工况的定时优化，而电控燃油喷射系统的重要优势之一就是能对喷射定时进行全工况自由调节。新型脉动式电控燃油喷射系统的喷射定时需要根据输油泵的供油凸轮型线、不同工况、油量、压力、经济性及排放性能的要求进行优化匹配。本文以电控直列泵—管—阀—嘴燃油喷射系统喷射控制理论分析为基础，根据喷射系统应用的实际条件进行了大量试验，为新型电控燃油定时的优化和匹配提供了依据和准则。     

基于直喷式汽油机电控系统硬件开发与试验研究

针对汽油直喷发动机电控系统提出总体设计技术方案,选取飞思卡尔MC9S12DP512MPVE单片机作为发动机ECU的主控芯片,进行了主控系统电路模块、信号处理电路模块、执行器驱动电路模块的设计开发.试验验证表明:电控系统的硬件设计满足发动机点火、喷油器电磁阀的驱动与控制性能要求,也验证该电控系统具有较高的可靠性和较强的抗干扰能力.     

新型高压共轨喷油器电磁阀驱动系统故障诊断及自保护系统设计

根据高压共轨柴油机喷油电磁阀在正常工作以及短路或断路工作状态下的驱动电流特性的分析结果,设计了一种基于CPLD（复杂可编程逻辑器件）、采用纯硬件逻辑电路结构的电磁阀故障检测系统.该系统通过对电磁阀驱动电流特征的快速提取和判断,能够迅速检测电磁阀的不同故障,并在故障出现时对电磁阀和驱动系统进行保护.试验结果表明:系统能在7ns内关闭故障电磁阀,从而有效地保证了发动机及其控制系统的安全运行.     

Advanced concept for dispersed power supply system using AC modules

A method of for estimating the reliability of new conceptual stand-alone dispersed power supply systems using AC modules with self-contained logic was proposed and system reliability estimated using a yearly scale simulation. The AC module is able to supply AC power on each module and has the flexibility to enable construction of a grid-connected system. Power storage devices were required when applying AC modules to the stand-alone power supply system. For these power storage devices, we used a battery with a built-in DC/AC micro bi-directional inverter known as AC battery. To maintain the flexibility of the system extension, the AC modules and AC batteries were controlled by self-contained logic. This logic performs parallel operations for the voltage control inverter and keeps supply and demand in balance.     

Design of the measurements validation procedure and the expert system architecture for a cogeneration internal combustion engine

A research activity has been initiated to study the development of a diagnostic methodology, for the optimization of energy efficiency and the maximization of the operational time in those conditions, based on artificial intelligence (AI) techniques such as artificial neural network (ANN) and fuzzy logic.The diagnostic procedure, developed specifically for the cogeneration plant located at the Engineering Department of the University of Perugia, must be characterized by a modular architecture to obtain a flexible architecture applicable to different systems. The first part of the study deals with the identifying the principal modules and the corresponding variables necessary to evaluate the module “health state”.Also the consequent upgrade of the monitoring system is described in this paper. Moreover it describes the structure proposed for the diagnostic procedure, consisting of a procedure for measurement validation and a fuzzy logic-based inference system. The first reveals the presence of abnormal conditions and localizes their source distinguishing between system failure and instrumentation malfunctions. The second provides an evaluation of module health state and the classification of the failures which have possibly occurred. The procedure was implemented in C++.     

Polar coordinated fuzzy controller based real-time maximum-power point control of photovoltaic system

It is crucial to improve the photovoltaic (PV) system efficiency and to develop the reliability of PV generation control systems. There are two ways to increase the efficiency of PV power generation system. The first is to develop materials offering high conversion efficiency at low cost. The second is to operate PV systems optimally. However, the PV system can be optimally operated only at a specific output voltage and its output power fluctuates under intermittent weather conditions. Moreover, it is very difficult to test the performance of a maximum-power point tracking (MPPT) controller under the same weather condition during the development process and also the field testing is costly and time consuming. This paper presents a novel real-time simulation technique of PV generation system by using dSPACE real-time interface system. The proposed system includes Artificial Neural Network (ANN) and fuzzy logic controller scheme using polar information. This type of fuzzy logic rules is implemented for the first time to operate the PV module at optimum operating point. ANN is utilized to determine the optimum operating voltage for monocrystalline silicon, thin-film cadmium telluride and triple junction amorphous silicon solar cells. The verification of availability and stability of the proposed system through the real-time simulator shows that the proposed system can respond accurately for different scenarios and different solar cell technologies.     

Fuzzy logic-based MPPT controllers for three-phase grid-connected inverters

In photovoltaic (PV) applications, a maximum power point tracking (MPPT) module is necessary to extract the whole energy that the PV module can generate depending on the instantaneous conditions of the PV system. A PV module is obtained by connecting a number of solar cells in series and parallel, which causes voltage and current to increase at module terminations. The present work is based on a three-phase grid-connected inverter designed for a 100 kW PV power plant that uses an MPPT scheme based on fuzzy logic controllers. The whole system presented is simulated in MATLAB. The fuzzy logic-based MPPT controllers show accurate and fast responses and are integrated into the inverter, so that the there is no requirement for a dc–dc converter. The inverter allows full control of reactive power.     

中海油文昌13-2平台原油电站系统集成设计研究

从原油发电机组、辅助系统及控制系统三方面介绍了中海油文昌13-2平台原油电站系统的集成设计。电站系统原油发电机组模块、各辅助系统撬块和控制系统均已完成出厂性能试验。试验数据表明:性能满足设计要求,机组工作状态良好。目前,该电站系统已取得CCS船级社产品检验证书,并交付用户,验收合格。     

基于Logo和变频技术的医院恒压供水设计

采用德国西门子逻辑模块Logo和日本三垦SHF、SPF系列变频器及独特最新技术SWS实现高性能全自动恒压供水,根据管网瞬间压力的变化,自动调节某台电机的转速和多台电机的投入及退出,从而使管网出口端保持在恒定的压力值,整个系统始终保持在高效节能和最佳运行状态。     

基于ADS8364与FLASH的多通道数据采集系统设计

针对传统数据采集系统设计方法无法实现高精度实时采集的问题,提出了基于现场可编程和逻辑门阵列(FPGA)和高精度模数转换器ADS8364的多通道同步实时数据采集系统的设计方案,并给出了硬件接口电路和模块化设计思想.系统已成功应用于炮弹发射过程中的姿态数据采集处理,实践结果表明采用该方法设计的系统能有效完成多路同步高速数据采集任务.     

高压共轨系统核心电路的EMC分析与设计

基于电控柴油机ECU的软硬件结构,分析和探讨了高压共轨系统核心电路的EMC问题,从电路控制和PCB布板两方面对其进行了电磁兼容性设计。台架实验表明,改进后的高压共轨系统核心驱动模块的抗干扰性能能够满足车用柴油机的电磁环境。     

采用“三取二”保护逻辑的分析与应用

阐述了"三取二"保护逻辑的基本原理和特点,通过对5种保护逻辑建立数学模型,从可靠性的角度分析了保护逻辑的误动率和拒动率,论证了"三取二"保护逻辑既能防止误动又能防止拒动,具有较高的可靠性和优越性。结合上海奉贤逆变站的实际,以阀短路保护为例,剖析了在不同动作策略下的"三取二"保护逻辑模块所处的位置以及出口方式,证实了无论从可靠性还是经济性考虑,向家坝—上海±800kV特高压直流保护系统采用"三取二"保护逻辑是科学的。