丰田ETCS-i智能电子节气门控制系统故障诊断与排除

电子节气门控制系统根据节气门踏板的程度,通过电控单元使得气门开度得到精确控制,提高汽车的动力、燃料经济性,减少排放污染,同时也使结构得到简化,在汽车上被广泛应用。但电子节气门工作不良引起的故障也较为常见,本文主要针对电子节气门在出现怠速偏高伴有加不起速的故障进行探讨。     

汽车电子节气门控制器开发

介绍了电子节气门的结构和驱动原理,设计了电子节气门控制器的软硬件.在电子节气门试验台上进行了试验,试验结果证明控制器的动态响应满足设计指标.利用系统辨识的方法获得了电子节气门控制系统的数学模型,分析了电子节气门控制系统的动态特性,证明设计的控制器满足控制要求.     

电子节气门驱动系统设计与实现

为推广电子节气门控制技术在农用拖拉机上的应用,本文设计了一种基于C8051F020的电子节气门嵌入式控制系统。文章首先介绍了电子节气门控制系统的组成;在此基础上,设计了节气门驱动控制单元的软硬件系统;最后进行了实验测试。结果表明,所开发的电子节气门控制系统能较好地满足各种应用需求。     

基于滑模控制的发动机电子节气门研究

电子节气门是车用发动机的一个十分重要的装置,为提高汽车行驶的动力性、平稳性、经济性以及降低排放,已经被广泛应用于汽车发动机上。电子节气门是一个典型的非线性系统,结合电子节气门的结构特点,在MATLAB/Simulink平台上建立了动态仿真模型,建立了节气门控制器的数学模型,设计了基于滑模控制的电子节气门控制器,并与PID控制结果进行比较。结果表明,采用滑模控制能克服系统中的非线性和不确定性,节气门开度从小到大的阶跃变化时,无超调而且稳态误差小,能迅速地获得预期节气门的开度。     

基于滑模控制的发动机电子节气门研究

电子节气门是车用发动机的一个十分重要的装置,为提高汽车行驶的动力性、平稳性、经济性以及降低排放,已经广泛应用于汽车发动机上.电子节气门是一个典型的非线性系统,结合电子节气门的结构特点,在MATLAB/Simulink平台上建立了动态仿真模型.建立了节气门控制器的数学模型,设计了基于滑模控制的电子节气门控制器,并与PID控制结果进行比较.结果表明,采用滑模控制能克服系统中的非线性和不确定性.节气门开度从小到大的阶跃变化时,无超调,而且稳态误差小,能迅速地获得预期节气门的开度.     

基于Matlab/Simulink的电子节气门控制系统仿真

介绍汽车电子节气门控制系统的结构组成和控制原理,建立基于Matlab/Simulink的动态仿真模型。针对电子节气门控制系统的非线性特点,设计变结构滑模控制器,并进行仿真分析,控制性能可以满足实车使用要求。     

增程式电动汽车电子节气门连续逼近滑膜控制器设计

增程式电动汽车是混合动力汽车的重要方向之一。为了提高增程式电动汽车电子节气门控制性能,且控制效果不随电子节气门特性变化而变差,基于电子节气门非线性特性,建立面向控制器设计的非线性模型;应用递推平均滤波法对待跟踪开度信号和节气门位置反馈信号进行滤波,采用切换控制率构造电子节气门经典滑膜控制器。针对经典滑膜控制器会产生颤振的问题,对切换控制率在滑膜面附近进行连续逼近,设计了基于平滑控制率的电子节气门连续逼近滑膜控制器。其后应用不变集理论分析控制系统的稳定性,并给出连续逼近滑膜控制器参数选取原则。通过实验验证所设计控制器的实时性和有效性,结果表明,所设计的连续逼近滑膜控制器能够有效抑制颤振现象,很好地实现电子节气门的跟踪控制,控制效果对模型精确度依赖性不高,不随电子节气门特性变化而变差。     

高速开关阀控制的电液式节气门执行器

研究了一种利用高速开关阀对节气门进行电子控制的系统方案。使用电液式执行器作为节气门控制的执行机构，利用高速开关阀对执行器进行连续的流量控制。建立了控制系统的数学模型。关于高速开关阀的开启时间所引起的精确定位问题，通过在控制器中加入非线性补偿环节的方法予以补偿。文中还对节气门位置控制中，被控对象的主要影响参数进行了讨论。数字仿真和装车道路试验，证明了该控制系统的实用性和可行性。     

节气门位置传感器的结构原理与检修

节气门位置传感器是发动机电子控制系统的重要部件,电控单元根据节气门开度及其变化率,来对发动机运行工况进行判断,以用来精确控制发动机和其他相关系统的工作。     

电控机械自动变速车辆发动机转速控制

分析了AMT车辆发动机控制方式和特点,提出了AMT车辆起步和换档过程发动机转速控制目标;对机械式节气门发动机通过加装电子节气门实现了发动机转速自动控制的要求;建立了发动机转速模糊控制器,并应用于所开发的AMT控制系统.台架试验结果表明改装的电子节气门控制性能良好,所建立的模糊控制器能够较好满足AMT车辆发动机转速控制的需求.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.