柳工922D型挖掘机电控油门工作原理及故障排查方法

正柳工922D型挖掘机的电控油门控制系统是柳工自主研发的产品。为了提高油门控制精度和发动机功率控制效果,柳工的油门控制系统采用了双闭环控制方式。本文介绍该电控油门工作原理及故障排查方法。1.工作原理922D型挖掘机电控油门系统主要由主控制器、油门电动机控制器、油门电动机、发动机转速传感器和10挡油门旋钮等组成,电控油门系统如图1所示。挖掘机作业时,主控制器检测到操作人员设定的油门旋钮信号后,输出相应的控制信号至油门电动机控制器。油     

液压挖掘机油门控制部分故障诊断

小松ＰＣ ２００－５型液压挖掘机采用计算机控制发动机油门,通过传感器输入信号控制发动机和液压系统的工作。这种智能控制可获得动力与液压系统的最佳匹配和多种控制功能。控制结构的原理如图１所示。 图中６个输入信号经相应组合,通过油门控制器处理后再输出信号,以实现对整机系统的监控、处理功能。 一台小松ＰＣ ２００－５型挖掘机的电脑油门控制系统出现了故障,表现为：机器起动后发动机先突然降速,然后又自动加速,发动机油门出现往复窜动的现象,导致机器无法正常工作。经分析,上述故障可能与油门控制器的相关输人信号、电脑…     

关于某厂载货车配装玉柴国五YC4S160-50发动机加速慢故障分析

针对玉柴配套某卡车厂载货车出现车辆提速慢问题从发动机本体故障、整车配置、电路系统等方面进行了全方位的分析,特别是进行了各种实时工况的检测和分析:包括中冷压力对比、循环油量对比、油门、车速、发动机转速实时监测对比,最后进行了整车配置验证,以达到最终解决故障。     

匹配混合动力车辆的国四柴油机冒黑烟故障分析、解决

针对玉柴配套混合动力公交车的国四柴油机冒黑烟问题从机械、电路、电控程序、整车匹配等方面进行了全方位分析,特别是进行了各种运行工况的路试分析,监控了车速、发动机转速、瞬时油量、油门电压、发动机电压、过程循环油量、油门开度等重要参数,以最终解决故障。     

传统机械式发动机转速电控方法的改进

<正>1.传统转速控制方法传统的机械式发动机转速电控方法对发动机转速进行控制前,需预先进行系统标定,并对相关数据进行存储。该转速控制方法对转速的控制过程如下:预先通过油门挡位旋钮在控制器内设定转速挡位,作业时控制器根据操作人员选定的油门挡位向油门执行器输出转速信号,由油门执行器电动机驱动发动机油门调节器软轴,通过调节软轴伸缩,调节发动机油门至油门挡位旋钮设定的转速。     

步进电机在控制发动机油泵调节器油门开度中的研究与应用

本文研究和分析了步进电机控制某航空发动机油泵调节器油门开度的机理,提出了一种步进电机应用于控制油门开度大小的控制方案,设计了步进电机控制油泵调节器油门开度的机械传动装置,实现了对步进电机的计算机控制。通过对该控制系统的试验,表明：本文设计的控制系统不仅结构简单,能有效地实现对某航空发动机油泵调节器油门开度的控制,而且控制的精度较高。     

小松PC200-5型液压挖掘机电气控制系统故障诊断

一、液压泵控制器和发动机油门控制器的显示方式 1.发动机油门控制器 (1)型号代码显示功能(正常显示)如表1所示.     

混联式混合动力汽车整车控制器硬件系统设计

介绍了电源管理、CAN通信、信号处理及电磁阀驱动等硬件电路的设计方法,并针对某款混联式混合动力汽车,设计了混合动力汽车整车控制器(HCU)的硬件系统。硬件在环仿真结果表明,HCU硬件系统响应速度快、实时性强,能够准确、有效地控制发动机和电机等对象,实现能量管理和动力分配,完成各控制器之间的通讯,满足混合动力汽车整车控制系统的设计要求。     

轿车无级变速传动系统综合模糊控制研究

首先建立了包括发动机、离合器、CVT和载荷在内的无级变速传动系统的动力学模型。针对汽车行驶工况复杂多变,且其传动系统输入输出具有强耦合的特点,提出了以目标功率为目标量的油门-速比协调综合模糊控制策略,设计了油门自组织模糊控制器和速比参数自调整模糊控制器。最后,基于仿真模型对设定工况进行了仿真和分析,并根据所提出的控制算法,以韩国大宇Matizll轿车为试验样车进行了整车性能道路试验。仿真和实验结果表明所建模型正确,所提出的综合模糊控制算法是可行和有效的,实现了发动机和变速器的合理匹配,解决了动态过程中无级变速汽车动力性和经济性相协调的问题。     

电动轮车辆分布式控制系统设计分析

分布式控制系统由若干控制单元与总线网络所构成,解决传统线束控制单元繁复且占用空间大的问题,提高了设备运行的可靠性。电动轮车辆动力系统由带有ECU的发动机和发电机相连组成电力输出源,通过整流和逆变过程驱动轮边交流电机运行,根据此运行特点,对控制系统进行设计。根据设计需要,该控制系统由一个主控制器、一个从控制器和若干个控制单元组成。建立控制系统的实验平台,针对控制系统的时间特性和发电机、牵引电机的运行特点进行分析。结果可知:系统满足整车时间特性需求;发电机、牵引电机及其控制器的效率及阶跃响应速度等主要性能指标基本达到所规定指标,满足整车设计使用要求;控制系统的设计合理、高效,有效地提高了整车运行的可靠性和实用性。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.