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柴油机高压共轨燃油喷射系统研究进展 总被引:1,自引:0,他引:1
高压共轨燃油喷射系统被内燃机行业公认为20世纪三大技术飞跃之一,是未来柴油机燃油喷射系统的主要发展方向。详细阐述了电控高压共轨燃油喷射系统的组成、工作原理和特点,综述了上述领域的研究现状,并提出了未来的研究目标和发展方向,以期为柴油机喷射系统的进一步发展提供思路和方法。 相似文献
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高压共轨燃油喷射技术和发动机电控技术是现代柴油机的两大技术核心,高压共轨燃油喷射技术与电控技术的紧密结合,成为内燃机行业公认的20世纪三大突破之一。柴油机高压共轨燃油喷射系统是迄今最先进的柴油机燃油喷射系统:燃油喷射压力高且独立于发动机转速、可实现对喷油量、喷油定时和喷油速率的全工况柔性控制。高压共轨喷油系统是全电子控制系统,其燃油喷射压力、喷射油量、喷射正时和喷油速率均通过电子控制单元(ECU)来实现。 相似文献
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柴油机燃油喷射系统已进入了电控共轨时代。高压共轨燃油系统被称为柴油机发展史上的第三座里程碑。文章从发展历程、原理和组成、使用效果、国内应用等方面加以概述,力求为读者理清此项技术奠定基础。柴油机高压共轨作为节能减排、满足更高排放要求的支撑性技术,必将得到快速推广。 相似文献
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针对RT-flex系列二冲程低速柴油机配套燃油喷射系统存在的问题,基于液压伺服控制原理提出一种新型船用高压共轨燃油喷射伺服控制系统,该系统采用液压位置闭环系统控制高压重油喷射系统的动作。根据系统原理,研究了其数学模型,并在AEMSim软件中搭建了考虑两种流体特性的仿真模型。在给定喷射时间内得到了不同压力时的主阀芯位移曲线、喷射压力波动曲线和喷油率曲线,并计算出单次喷射时系统喷油量。仿真结果表明,在喷射时间内高压共轨重油喷射系统动作快速稳定,验证了船用高压共轨重油喷射伺服控制系统的设计是合理可行的。 相似文献
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柴油机发动机开发中,运用了高压共轨技术,与此同时促进柴油发动机开发设计方案的不断完善。为减少发动机噪音,减少污染,将高压共轨技术广泛运用于柴油发动机开发设计中。本文首先介绍高压共轨柴油发动机的构成,然后介绍高压共轨柴油机喷射技术的优势,最后介绍高压共轨技术在柴油发动机开发设计中的运用,同时还进行喷射结构优化案例分析,以此方式增强人员对柴油发动机的开发设计意识,掌握高压共轨技术。 相似文献
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柴油机高压共轨电控燃油喷射技术,是现代柴油机进行性能改进的关键技术措施之一。随着燃烧理论的进步,对喷油率形状及喷射压力有了更高的要求,即喷油率可调、多次喷射及超高喷射压力。常规高压共轨系统的喷油率形状近似于矩形,而且只能通过喷射压力调节矩形的高度,无法改变其形状。同时国内尚没研制出可以实现超高压喷射的压力源。本文结合国内外共轨电喷技术的发展特点,提出了双压共轨系统这一结构型式。双压共轨系统主要适用于非道路用大功率柴油机,该系统在单次喷射中能够提供两级压力-基压和高压,基压能够满足柴油机部分负荷的喷油需要,高压能够满足全负荷的需要。高低压的转换及组合通过喷油器电磁阀及增压器电磁阀配合完成。通过高低压的组合能够实现喷油规律的变化。 相似文献
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近年来柴油发动机高压喷射及其电控技术的快速发展,使柴油机在油耗、功率、扭矩和尾气排放方面显现出越来越明显的优势。国外发展趋势表明,柴油机在市场中的份额将会越来越大。通过对德国西门子公司VDO汽车零部件部门研制开发的第二代采用压电石英元件的共轨喷射系统的介绍,让读者了解到柴油共轨喷射系统的最新科技与发展动向,为国内柴油发动机技术革新与生产加工提供一定的帮助。 相似文献
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WU Changshui YU Jinxia YANG Lin ZHUO Bin Institute of Automotive Electronic Technology Shanghai Jiaotong University Shanghai China 《机械工程学报(英文版)》2006,19(3):407-411
Based on the numerical simulation analysis, structure parameters of the high pressure fuel pump and common rail as well as flow limiter are designed and the GD-1 high pressure common rail fuel injection system is self-developed. Fuel injection characteristics experiment is performed on the GD-1 system. And double-factor variance analysis is applied to investigate the influence of the rail pressure and injection pulse width on the consistency of fuel injection quantity, thus to test whether the design of structure parameters is sound accordingly. The results of experiment and test show that rail pressure and injection pulse width as well as their mutual-effect have no influence on the injection quantity consistency, which proves that the structure parameters design is successful and performance of GD-1 system is sound. 相似文献
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为了检测高压共轨喷油器的工作性能,改善汽车尾气的排放质量,对高压共轨喷油器的动作原理及其检测波形进行了分析,并对喷油器的喷油量进行了计算。采用PLC技术,利用PWM方法,设计了一种喷油器检测电路及其测试平台,可以检测各类型号的高压共轨喷油器在怠速及全油门状态下的喷油状况,对其喷油质量给出判定,该平台也可进行喷油嘴驱动电路的优化研究。 相似文献
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通过对第二代压电石英作为执行器的共轨系统(PCR)的具体介绍,解释了电控共轨、压电石英等新技术和新工艺,让读者了解到柴油共轨喷射系统的最新科技与发展动向。 相似文献
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Sejun Lee Soojin Jeong Ocktaeck Lim 《Journal of Mechanical Science and Technology》2012,26(10):3323-3330
We investigated the DME spray characteristics about varied ambient pressure and fuel injection pressure using the common rail fuel injection system when the nozzle holes diameter is varied. The common rail fuel injection system and fuel cooling system were used since DME has compressibility and vaporization at atmospheric temperature. The fuel injection quantity and spray characteristics were measured. The spray was analyzed for spray shape, penetration length, and spray angle at the six nozzle holes. There are two types of injectors: 0.166 mm diameter and 0.250 mm diameter. The ambient pressure, which was based on gage pressure, was 0, 2.5, and 5 MPa. The fuel injection pressure was varied by 5 MPa from 35 to 70 MPa. By comparing with the common injector, using the converted injector it was shown that the DME injection quantity was increased 127% but it didn??t have the same low heating value. Both the common and converted injectors had symmetric spray shapes. In case of converted injector, there were asymmetrical spray shapes until 1.2 ms, but after 1.2 ms the spray shapes were symmetric. Also, the converted injector had shorter penetration length and wider spray angle than the common injector. 相似文献
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In this paper modeling and common-rail pressure control of high pressure common rail injection system (HPCRIS) is presented. The proposed mathematical model of high pressure common rail injection system which contains three sub-systems: high pressure pump sub-model, common rail sub-model and injector sub-model is a relative complicated nonlinear system. The mathematical model is validated by the software Matlab and a virtual detailed simulation environment. For the considered HPCRIS, an effective model free controller which is called Extended State Observer – based intelligent Proportional Integral (ESO-based iPI) controller is designed. And this proposed method is composed mainly of the referred ESO observer, and a time delay estimation based iPI controller. Finally, to demonstrate the performances of the proposed controller, the proposed ESO-based iPI controller is compared with a conventional PID controller and ADRC. 相似文献
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The effects of change in injection pressure on spray structure in high temperature and pressure field have been investigated.
The analysis of liquid and vapor phases of injected fuel is important for emissions control of diesel engines. Therefore,
this work examines the evaporating spray structure using a constant volume vessel. The injection pressure is selected as the
experimental parameter, is changed from 400 bar to 800 bar by using a common rail injection system. Also, we conducted simulation
study by modified KIVA-II code. The results of simulation study are compared with experimental results. The images of liquid
and vapor phase for free spray were simultaneously taken by exciplex fluorescence method. As experimental results, the vapor
concentration of injected fuel is leaner due to the increase of atomization in the case of the high injection pressure than
in that of the low injection pressure. The calculated results obtained by modified KIVA-II code show good agreements with
experimental results. 相似文献