共查询到18条相似文献，搜索用时 453 毫秒
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以4100柴油发动机为研究对象,用fire软件模拟分析不同EGR对生物柴油燃烧性能和排放的影响。结果表明,应用EGR,能有效降低生物柴油发动机NOX的排放,但同时发动机的动力性和经济性会有一定幅度的下降;EGR率的增加会给柴油机的动力性、燃油消耗率、烟度的排放带来不同程度的负面影响,使柴油机的最大爆发压力及放热率峰值下降。 相似文献
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介绍了柴油机有害排放物的种类及机内净化的主要措施。通过优化燃烧系统,改进燃油喷射系统,优化进气系统,以及采用废气再循环（EGR）、可变化控制技术、减小机油消耗和运用新型燃烧理论等都可有效地降低柴油机有害排放指标。 相似文献
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本文主要介绍6240ZJA型铸造柴油机的主要结构,该柴油机标定功率1200kW,使用铸造机体后提柴油机的安全性、可靠性、耐久性。 相似文献
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自标定方法可以得到相机系统的内部参数和/或外部参数,而不对场景结构作假设或作很少假设。本文提出一种新的自标定方法,用于投影相机建模系统。一个关键点在于投影仪既可以作为主动光源使用,也可以当做一个虚拟相机使用。首先,使用结构光方法从不同角度投影并拍摄一组图像。然后,通过将空间约束关系转换为内参约束,完成对系统的自标定。最后,利用估计的参数进行3D建模。实验结果验证了本文方法的可行性。 相似文献
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相机标定是三维重构中的关键步骤,本文对在自标定下的两视图三维几何模型恢复进行研究。先采用SURF算法得到图像匹配点对,在此基础上,利用RANSAC鲁棒估计基础矩阵;然后根据Kruppa方程所推导出的二次方程自标定出相机内参数,进一步地,通过分解本质矩阵求解出相机外参数;最后,根据三角化法求得空间三维坐标值。实验结果证实,该方法具有效性和正确性,并且能够真实地再现物体的三维模型。 相似文献
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在柴油机应用中,为减少柴油机尾气危害物质排放,可以优化设计其尾气处理系统,有效抑制柴油机的能源消耗与有害尾气的排放量。以下本文浅谈在柴油机尾气后处理系统中,其计量装置的设计与标定问题。 相似文献
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柴油机整车动力学仿真模型是电控柴油机控制软件开发与测试的基础。本文应用实验分析和系统辨识的方法,以YC4D130电控柴油机台架试验为基础构建了发动机模型,并结合理论建模的方法,进一步构建了整车动力学仿真模型。经过试验车辆数据和MATLAB/Simulink仿真结果的对比,证实该模型可有效模拟车辆的行驶性能及换档过程,为柴油机控制策略的整车功能分析研究和设计验证提供了可靠的仿真平台。 相似文献
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Pak Kin Wong Xiang Hui Gao Ka In Wong Chi Man Vong 《Journal of The Franklin Institute》2018,355(4):1517-1538
Modern engines are controlled by electronic control units, which operate all the engine actuators based on the signals from various sensors in the engine. Traditionally, the control parameters of the actuators are obtained through huge amount of trial-and-error experiments. However, using traditional approach to calibrate these parameters becomes more challenging with the increasing incorporation of new technologies into advanced engines. In order to reduce the number of experiments required in the calibration process of modern engines, a novel point-by-point engine calibration approach based on machine learning methods is proposed in this study. It is an iterative procedure that, for a given operating point, sequential design of experiment (DoE) strategy is utilized to measure the responses of different engine sensors corresponding to different actuator signals, and a machine learning algorithm called initial-training-free online extreme learning machine is utilized to incrementally learn the relationship between the sensors and actuators based on the measurement acquired. In each iterative cycle, meta-heuristic optimization is performed on the machine-learning-based model to search for the best parameters, which are then used as the initial parameters for generating DoE plan of the next cycle. The iteration is repeated until the optimal parameters of that operating point are found. To verify the effectiveness of the proposed approach, experiments on both simulation engine in commercial software and real engine in test bench have been conducted. The results show that the engine calibration can be carried out with significant fewer experiments and time by using the proposed approach. 相似文献
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目前,全国有机动车技术性能检测站、维修企业几千家,按相关规定均应配有汽油发动机转速测量仪。由于至今没有相应的国家计量检定规程和相应的检测校准装置,就产生了无法校准的现状。汽油发动机转速测量仪标准装置成功研制,将有效地解决我国目前机动车发动机转速测量仪无法校准的难题,满足汽车生产企业以及广大汽车检测行业对发动机转速测量仪校准的需求。 相似文献
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A new approach for observer-based feedback control of time-delay systems is developed. Time-delays in systems lead to characteristic equations of infinite dimension, making the systems difficult to control with classical control methods. In this paper, a recently developed approach, based on the Lambert W function, is used to address this difficulty by designing an observer-based state feedback controller via assignment of eigenvalues. The designed observer provides estimation of the state, which converges asymptotically to the actual state, and is then used for state feedback control. The feedback controller and the observer take simple linear forms and, thus, are easy to implement when compared to nonlinear methods. This new approach is applied, for illustration, to the control of a diesel engine to achieve improvement in fuel efficiency and reduction in emissions. The simulation results show excellent closed-loop performance. 相似文献
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怠速抖动是柴油机常见故障之一,也是极易引起用户抱怨的问题。本文对装配VE泵的柴油机怠速抖动问题进行了分析,并提出解决的分法。 相似文献
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As the most widely used thermal power machine the diesel engine plays a key role in today's social economic development. Its dynamic performance could be effectively upgraded by one of its core components the turbocharger whose quality largely depends on welding technology for dissimilar materials.…… 《中国科学院院刊(英文版)》2008,22(1):11-11
As the most widely used thermal power machine, the diesel engine plays a key role in today＇s social and economic development. Its dynamic performance could be effectively upgraded by one of its core components, the turbocharger, whose quality largely depends on welding technology for dissimilar materials. 相似文献
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把调速器、柴油机、喷油泵看成一个大系统,调速器就是维持系统平衡的信息处理器和控制装置。运用系统论、信息论、控制论的观点。结合框图、坐标图,按四个模块讲述柴油机调速器的工作原理,是对传方法改进的一种尝试。 相似文献