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Influence of eddy current on transient characteristics of common rail injector solenoid valve 被引量:1
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作者 李丕茂 张幽彤 《Journal of Beijing Institute of Technology》 EI CAS 2015年第1期26-34,共9页
Influence of eddy current on transient characteristics of common rail injector solenoid valve was studied in this paper. Experimental investigations of drive current and power source volt- age of both drive current as... Influence of eddy current on transient characteristics of common rail injector solenoid valve was studied in this paper. Experimental investigations of drive current and power source volt- age of both drive current ascending and descending process were conducted on a common rail injec- tor solenoid valve. A new discretizing calculation method of solenoid valve flux linkage was put for- ward for the first time based on the experimental results and drive circuit principle, and flux linkage of both drive current ascending and descending process were evaluated. New inductance calculation methods for drive current ascending and descending process respectively were also presented. Influ- ence of parasitic inductance was evaluated. Results indicate that the air gap, under which the transi- ent flux linkage of the solenoid valve is the biggest, varies with drive current due to eddy current. Flux linkage of drive current descending process is bigger than that of drive current ascending process under the same drive current and the same air gap width. Eddy current can reduce the delay between the time that drive current begins to descend and the time that armature begins to move downward. Inductance of drive current descending process is bigger than that of drive current as- cending process over larger scope of drive current, but the difference becomes smaller with the in- creasing of air gap width. The differences of both flux linkage and inductance between drive current ascending and descending process are caused by the eddy current in core and armature materials. 展开更多
关键词 common rail injector solenoid valve transient characteristic flux linkage INDUCTANCE eddy current
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STRATEGY FOR DIESEL ROTARY ENGINE WITH COMMON RAIL INJECTION SYSTEM 被引量:2
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作者 WU Jinjun HAI Jingtao +3 位作者 SHI Jianzhong LI Xuesong YANG Qing WANG Shangyong 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2006年第3期412-416,共5页
A direct injection low compression ratios diesel rotary engine is designed and studied to find the appropriate application of the electronic controlled high pressure common rail injection system. Current development f... A direct injection low compression ratios diesel rotary engine is designed and studied to find the appropriate application of the electronic controlled high pressure common rail injection system. Current development focuses on the applied fuel injection and ignition strategies, especially concerning the combustion configurations of injectors, ignition source, and combustion chamber. The prototype engine, equipped with Bosch common rail system and high performance electronic control unit (ECU), is designed correspondingly. Studies show that the integration of a common rail injection system and the main and pilot duel injectors configurations, assisted with glow plug ignition device and flexible ECU, represents a promising approach to improve the potential of the low compression ratios diesel rotary engine. Currently the engine can run at 6 kr · min^-1 steadily and the power is about 68 kW/(4 kr ·min^- 1). 展开更多
关键词 Diesel rotary engine common rail injection system Electronic control unit(ECU)
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Frequency compensation control method for opposedpiston two-stroke folded-cranktrain engine's common rail system by loop-shaping theory
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作者 左哲 张哲瑜 +2 位作者 钱李龙 张付军 岳广臣 《Journal of Beijing Institute of Technology》 EI CAS 2016年第2期194-201,共8页
A frequency compensation control method for the opposed-piston two-stroke folded-cranktrain( OPFC) diesel engine's common rail system is presented as a result of the study of the loop-shaping theory. A common rail ... A frequency compensation control method for the opposed-piston two-stroke folded-cranktrain( OPFC) diesel engine's common rail system is presented as a result of the study of the loop-shaping theory. A common rail working process and the classical frequency control theory are combined to construct a frequency restriction of common rail pressure. A frequency compensator is utilized to improve the robustness of multiplicative perturbations and disturbance. The loop-shaping method has been applied to design the common rail pressure controller of the OPFC diesel engine. Simulation and bench test results show that in the condition of perturbation that comes from the effect of injection,multi-injection,fuel pumping of a pre-cylinder,and instantaneous pressure fluctuation,the controller indicates high precision. Compared with the original controller,this method improves the control precision by 67. 3%. 展开更多
关键词 robust control opposed-piston two-stroke folded-cranktrain diesel engine loop-sha-ping frequency compensator common rail control
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An experimental study on RP-3 jet fuel injection on a common rail injection system
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作者 ZHAO Tong-bin WU Yi-sheng +2 位作者 DUAN Yao-zong HUANG Zhen HAN Dong 《Journal of Central South University》 SCIE EI CAS CSCD 2022年第7期2179-2188,共10页
RP-3 jet fuel could be an alternative fuel for diesel engines.In this study,the injection characteristics of RP-3jet fuel under single and split injection strategies were investigated and compared with diesel fuel.The... RP-3 jet fuel could be an alternative fuel for diesel engines.In this study,the injection characteristics of RP-3jet fuel under single and split injection strategies were investigated and compared with diesel fuel.The experimental results indicate that RP-3 jet fuel has slightly shorter injection delay time than diesel fuel,but this difference is negligible in actual engine operations.Further,although the lower density and viscosity of RP-3 jet fuel lead to higher volumetric injection rates and cycle-based injection quantities,the cycle-based injection mass and the mass injection rates at the stable injection stage of RP-3 jet fuel are close to or slightly lower than those of diesel fuel.Based on these experimental observations,it could be concluded that fuel physical properties are the secondary factor influencing the injection characteristics in both single and split injection strategies,as RP-3 jet fuel and diesel fuel are taken for comparison. 展开更多
关键词 RP-3 jet fuel diesel engine single injection pilot-main injection common rail injection system
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Characteristics of Diesel/N-Butanol Blend on a Common Rail Diesel Engine with Exhaust Gas Recirculation
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作者 Yanfei Chen Jingjing He +2 位作者 Hao Chen Xin Su Bin Xie 《Energy Engineering》 EI 2022年第3期1239-1259,共21页
20%n-butanol is blended in diesel by volume(noted as D80B20)and experiment has been carried out to study the effect on the combustion and emission characteristics based on a common rail diesel engine with exhaust gas ... 20%n-butanol is blended in diesel by volume(noted as D80B20)and experiment has been carried out to study the effect on the combustion and emission characteristics based on a common rail diesel engine with exhaust gas recirculation(EGR)system.The results reveal thatD80B20 has longer ignition delay,shorter combustion duration and higher maximumin-cylinder temperature than pure diesel(noted as D100).Further,the number concentration and volume concentration of ultrafine particles decrease significantly while NO_(X) emissions increase a little with the addition of n-butanol.When the exhaust gas is induced into cylinder,NO_(X) emissions significantly decrease and ultrafine particles emissions increase.The number geometric mean diameters and volume geometricmean diameters of ultrafine particles increase withEGR ratio.Compared toD100 without EGR,D80B20 with 20%EGR ratio can reduce both NO_(X) and ultrafine particles emissions at 0.14MPa BMEP and 0.56MPa BMEP. 展开更多
关键词 N-BUTANOL ultrafine particles COMBUSTION EMISSION common rail diesel engine
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Test Research on the Knock of a Common-Rail Diesel Engine Fueled with Diesel-Methanol Dual-Fuel
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作者 Chao Zhu Zhuopei Liu +1 位作者 Hao Chen Yangyang Li 《Energy Engineering》 EI 2023年第5期1081-1105,共25页
Experiments were conducted on a diesel-methanol dual-fuel(DMDF)engine modified by a six-cylinder,turbocharged,inter-cooled diesel engine.According to the number of diesel injection,the experiments are divided to two p... Experiments were conducted on a diesel-methanol dual-fuel(DMDF)engine modified by a six-cylinder,turbocharged,inter-cooled diesel engine.According to the number of diesel injection,the experiments are divided to two parts:the single injectionmode and double injectionmode.The results show that,at the double injectionmode,themaximumof pressure rise rate is small and the engine runs smoothly,however,knock still occurswhen the cocombustion ratio(CCR)is big enough.Under knock status,the power density of the block vibration concentrating at some special frequencies rises dramatically,and the special frequency of single injection mode(about 4.1 kHz)is lower than that of double injection mode(7–9 kHz).The cylinder pressure oscillations of knock status are very different fromthe non-knock status.Under knock status,cylinder pressure oscillations become more concentrated and fiercer at some special frequencies,and the same as the block vibration.The special frequency of single injection mode(3–6 kHz)is lower than that of double injection mode(above 9 kHz). 展开更多
关键词 common rail diesel engine diesel-methanol dual-fuel KNOCK block vibration pressure oscillation
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After-Sale Data Based Common Rail Injector Remanufacturability Analysis
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作者 ZHANG Jihao CHEAT Ming 《Journal of Shanghai Jiaotong university(Science)》 EI 2018年第3期337-344,共8页
The injector is the most critical and vulnerable part of a diesel engine, and injector remanufacturing seems to be a solution to change the adverse market conditions. For remanufactured injector, there are some differ... The injector is the most critical and vulnerable part of a diesel engine, and injector remanufacturing seems to be a solution to change the adverse market conditions. For remanufactured injector, there are some differences between China and developed countries. These differences make a different remanufacturability. New remanufacturing process should be evaluated to determine the feasibility. Fuqiang Power Company's experiment and the survey from Bosch Diesel Centers(BDCs) show the status of the used injectors that nearly one-third of the used injector can be remanufactured with low cost. It is feasible to produce quality remanufactured injector under given process. Promoting clean diesel engine is more likely to be accepted by the consumer. 展开更多
关键词 DIESEL AFTERMARKET common rail injector(CRI) REMANUFACTURING remanufacturability
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Pressure-Based Approach to Estimating the Injection Start and End in Single and Split Common Rail Injection Processes
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作者 ZHAI Jiaqi DUAN Yaozong HAN Dong 《Journal of Shanghai Jiaotong university(Science)》 EI 2018年第S1期28-33,共6页
Fuel injection timing is an important control parameter for engine combustion optimization and emissions control. However, the actual fuel injection timing is different from the nominal one commanded by the electronic... Fuel injection timing is an important control parameter for engine combustion optimization and emissions control. However, the actual fuel injection timing is different from the nominal one commanded by the electronic control unit, due to the system hydraulic lag or the possible communication malfunction. In this study,a simple estimate approach based on the injector inlet pressure is proposed to capture four critical characteristic instants at the start and end of injection. The critical characteristic moments estimated using this pressure-based approach are validated against those determined by the actual injection rate profiles, in the context of different single or split injection processes. The comparison revealed that the characteristic injection moments estimated by the injector inlet pressures and those determined by the actual injection rate profiles have a satisfactory agreement, certifying the broad applicability and reliability of this pressure-based approach in the detection of the real fuel injection start and end time. 展开更多
关键词 injector inlet pressure common rail injection system injection diagnostics single injection split injection
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Elimination of Fuel Pressure Fluctuation and Multi-injection Fuel Mass Deviation of High Pressure Common-rail Fuel Injection System 被引量:8
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作者 LI Pimao ZHANG Youtong +1 位作者 LI Tieshuan XIE Lizhe 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2015年第2期294-306,共13页
The influence of fuel pressure fluctuation on multi-injection fuel mass deviation has been studied a lot,but the fuel pressure fluctuation at injector inlet is still not eliminated efficiently.In this paper,a new type... The influence of fuel pressure fluctuation on multi-injection fuel mass deviation has been studied a lot,but the fuel pressure fluctuation at injector inlet is still not eliminated efficiently.In this paper,a new type of hydraulic filter consisting of a damping hole and a chamber is developed for elimination of fuel pressure fluctuation and multi-injection fuel mass deviation.Linear model of the improved high pressure common-rail system(HPCRS)including injector,the pipe connecting common-rail with injector and the hydraulic filter is built.Fuel pressure fluctuation at injector inlet,on which frequency domain analysis is conducted through fast Fourier transformation,is acquired at different target pressure and different damping hole diameter experimentally.The linear model is validated and can predict the natural frequencies of the system.Influence of damping hole diameter on fuel pressure fluctuation is analyzed qualitatively based on the linear model,and it can be inferred that an optimal diameter of the damping hole for elimination of fuel pressure fluctuation exists.Fuel pressure fluctuation and fuel mass deviation under different damping hole diameters are measured experimentally,and it is testified that the amplitude of both fuel pressure fluctuation and fuel mass deviation decreases first and then increases with the increasing of damping hole diameter.The amplitude of main injection fuel mass deviation can be reduced by 73%at most under pilot-main injection mode,and the amplitude of post injection fuel mass deviation can be reduced by 92%at most under main-post injection mode.Fuel mass of a single injection increases with the increasing of the damping hole diameter.The hydraulic filter proposed by this research can be potentially used to eliminate fuel pressure fluctuation at injector inlet and improve the stability of HPCRS fuel injection. 展开更多
关键词 high pressure common-rail system pressure fluctuation multi-injection fuel mass deviation hydraulic filter
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引燃柴油量对双燃料发动机循环变动的影响
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作者 宋建桐 杨屏 +1 位作者 王楠 赵畅 《机械设计与制造》 北大核心 2024年第8期44-47,共4页
为了降低重型高压共轨柴油机燃用LNG-柴油的燃烧循环变动,优化引燃柴油量控制,通过双燃料发动机试验台架,研究了在最大转矩转速1600r/min,功率输出为73kW工况下,随引燃柴油喷油量的增加,峰值压力、峰值压力升高率、平均指示压力循环变... 为了降低重型高压共轨柴油机燃用LNG-柴油的燃烧循环变动,优化引燃柴油量控制,通过双燃料发动机试验台架,研究了在最大转矩转速1600r/min,功率输出为73kW工况下,随引燃柴油喷油量的增加,峰值压力、峰值压力升高率、平均指示压力循环变动的变化趋势。研究结果表明,随引燃柴油量的增加,双燃料发动机的峰值压力、峰值压力升高率和平均指示压力的循环变动趋势相同,它们的均值均增大,标准差减小,循环分布集中,循环变动系数降低。在不导致爆震燃烧的前提下,适当增大引燃柴油量,能够改善双燃料发动机的燃烧稳定性。 展开更多
关键词 共轨柴油机 天然气 双燃料 引燃柴油量 循环变动
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高压共轨柴油机国产芯片控制系统研究
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作者 杨博 吴欣宸 +1 位作者 董霈 刘兵 《西安交通大学学报》 EI CAS CSCD 北大核心 2024年第6期43-52,共10页
针对现有高压共轨柴油机电控单元高度依赖进口芯片、自主不足的问题,提出了基于全国产芯片的高压共轨柴油机电控单元方案。所设计的国产控制单元选用兆易创新的GD32F450芯片为控制核心,承担发动机数据采样、处理、存储与控制任务。首先... 针对现有高压共轨柴油机电控单元高度依赖进口芯片、自主不足的问题,提出了基于全国产芯片的高压共轨柴油机电控单元方案。所设计的国产控制单元选用兆易创新的GD32F450芯片为控制核心,承担发动机数据采样、处理、存储与控制任务。首先,采用Boost升压电路提供喷油器峰值电流,利用分立器件设计双边驱动与电流反馈电路,在不依赖进口专用芯片的条件下,对喷油器驱动电流进行闭环控制;然后,基于FreeRTOS操作系统,开发高压共轨柴油机底层驱动软件,实现对不同任务调度周期的精准控制;最后,对所设计的电控单元进行了实验验证。结果表明,所设计的国产高压共轨柴油机电控单元功能齐全、工作稳定,双边驱动电路典型峰值电流为22 A,维持电流为10 A,最小喷射间隔时间为200μs,多次喷射性能与Bosch系统相当。发动机不同转速条件下任务调度周期精准、实时性好,研究证实了高压共轨柴油机电控单元全国产化方案的可行性,对推动发动机电控技术自主可控提供了有益参考。 展开更多
关键词 高压共轨柴油机 电子控制单元 国产芯片 底层软件 FreeRTOS操作系统
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喷油器柱塞副动态泄漏及特性
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作者 张勇 薛程雄 高振波 《科学技术与工程》 北大核心 2024年第1期230-237,共8页
为了研究高压共轨喷油器柱塞副的动态泄漏特性,建立了柱塞副间隙燃油流动的数学模型,通过有限差分法对数学模型进行数值计算,研究了不同轨压下柱塞副燃油的平均动态泄漏率的变化趋势,与试验值进行对比,验证该数学模型的有效性,并分析了... 为了研究高压共轨喷油器柱塞副的动态泄漏特性,建立了柱塞副间隙燃油流动的数学模型,通过有限差分法对数学模型进行数值计算,研究了不同轨压下柱塞副燃油的平均动态泄漏率的变化趋势,与试验值进行对比,验证该数学模型的有效性,并分析了轨压、进口燃油温度、柱塞最大升程和喷射脉宽四种因素对柱塞副动态泄漏量的影响及在不同柱塞速度下,油膜压力、厚度和温度参数的变化趋势。结果表明,在一个喷油循环内,动态泄漏率的变化曲线与控制腔油压变化曲线相似,平均动态泄漏率随着喷油器的轨压、入口燃油温度和柱塞最大升程的增加而增加,但随着喷射脉宽的增加而减小;随着柱塞速度由正速度到负速度的过程,油膜的厚度逐渐变薄,油膜的温度整体上升,油膜的压力变小。 展开更多
关键词 高压共轨 柱塞副 动态泄漏率 数值分析
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电控高压共轨喷油系统结构参数对轨内压力波动仿真分析
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作者 胡玲玲 莫清烈 +3 位作者 姜峰 曹文通 周俊明 魏啟印 《井冈山大学学报(自然科学版)》 2024年第1期93-100,共8页
采用GT软件建立电控高压共轨燃油喷射系统模型,并利用构建的仿真模型研究高压油泵的进油阀组件、排油阀组件以及活塞凸轮组件,其三个主要部分的结构参数变化对共轨管中压力波动的影响。通过研究可知高压泵在实际工作时所承受的压力波与... 采用GT软件建立电控高压共轨燃油喷射系统模型,并利用构建的仿真模型研究高压油泵的进油阀组件、排油阀组件以及活塞凸轮组件,其三个主要部分的结构参数变化对共轨管中压力波动的影响。通过研究可知高压泵在实际工作时所承受的压力波与活塞的状态有直接关系,且活塞状态包括其质量、长度、直径、容积等。为了更好地研究进排油阀对压力波动之间的关系,选用8组参数进行实验研究并验证进排油阀体直径、质量、弹簧预紧力、弹簧刚度的变化与压力波动之间的相互影响作用,进而通过对比选取最佳阀体。通过仿真分析可知,共轨喷油系统压力波动程度会受到系统结构参数的影响,并可以为系统的优化设计提供参考依据。 展开更多
关键词 高压共轨系统 压力波动特性 结构参数 仿真分析
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博世共轨压力泄压阀打开故障解析
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作者 杨月海 韩芷迪 《汽车电器》 2024年第7期84-87,共4页
文章主要对泄压阀的结构原理、故障发生机理进行系统介绍,并结合故障诊断与排除思路进行说明,以期能够为维修人员提供一些启发和帮助。
关键词 博世共轨 泄压阀 故障解析
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汽车发动机高压共轨系统轨压特性分析与优化
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作者 周传彪 韩振华 张勇 《现代制造工程》 CSCD 北大核心 2024年第8期68-75,共8页
基于关键零/部件参数,建立了汽车发动机高压共轨喷射系统的数学模型,使用AMESim软件进行仿真模拟,并通过试验分析验证了该仿真模型的准确性。通过对系统轨压波动和压力特性进行仿真分析,得出共轨管长度、内径和高压油管内径是影响系统... 基于关键零/部件参数,建立了汽车发动机高压共轨喷射系统的数学模型,使用AMESim软件进行仿真模拟,并通过试验分析验证了该仿真模型的准确性。通过对系统轨压波动和压力特性进行仿真分析,得出共轨管长度、内径和高压油管内径是影响系统轨压特性的重要参数。针对原始共轨管和高压油管模型,利用响应曲面法对共轨管和高压油管参数进行优化分析,并得出以平均轨压设定值为目标的共轨管和高压油管的最佳结构参数。经过优化后,汽车发动机高压共轨喷射系统的平均轨压提高了0.65%,整体轨压波动平均值降低了79.48%,单次喷射过程中轨压波动平均值降低了27.89%,平均喷油压力提高了0.63%,其喷油特性得到明显的改善。 展开更多
关键词 发动机 高压共轨 AMESIM软件 平均轨压 优化研究
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非道路柴油机冷却水套流动传热分析与优化
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作者 刘明健 雷基林 +1 位作者 宋国富 刘康 《机械设计与制造》 北大核心 2024年第2期45-49,共5页
冷却水套作为柴油机的核心结构,其流动与传热特性直接影响着柴油机的可靠性和使用寿命。以某两缸高压共轨柴油机为研究对象,为了解该发动机冷却水套流动与传热性能,以水套速度场、温度场、换热系数等空间分布参数为判据,重点对冷却水套... 冷却水套作为柴油机的核心结构,其流动与传热特性直接影响着柴油机的可靠性和使用寿命。以某两缸高压共轨柴油机为研究对象,为了解该发动机冷却水套流动与传热性能,以水套速度场、温度场、换热系数等空间分布参数为判据,重点对冷却水套关键区域的流动和传热特性进行分析,同时提出优化方案。仿真结果表明:发动机整体冷却液流动性差,平均流速低于0.5m/s,缸体进气侧冷却水套上部出现了流动死区;通过对冷却系统性能参数和冷却水套结构进行优化,冷却水套进出口压力损失减小,整体冷却液平均流速较原方案提高了173.91%,整体平均换热系数较原方案提高了41.93%,整体冷却水套流动均匀性得到改善。 展开更多
关键词 高压共轨柴油机 冷却水套 优化 流动特性 仿真分析
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基于堆叠稀疏自编码器的多缸喷油器堵塞定位算法
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作者 王健 黄英 +3 位作者 高晓宇 王拓 王绪 惠嘉赫 《兵工学报》 EI CAS CSCD 北大核心 2024年第10期3706-3717,共12页
燃油喷射系统的工作质量直接影响柴油机工作过程及性能,针对多缸机不同喷油器发生堵塞故障且故障程度不一时,传统故障诊断方法难以精准定位故障喷油器的问题,提出一种基于堆叠稀疏自编码器(Stacked Sparse Autoencoder,SSAE)的故障定位... 燃油喷射系统的工作质量直接影响柴油机工作过程及性能,针对多缸机不同喷油器发生堵塞故障且故障程度不一时,传统故障诊断方法难以精准定位故障喷油器的问题,提出一种基于堆叠稀疏自编码器(Stacked Sparse Autoencoder,SSAE)的故障定位算法。通过SSAE提取不同喷油器发生堵塞故障时轨压信号的深层特征,以softmax网络实现故障部件定位。以一维轨压信号为输入,故障喷油器定位为输出,并研究算法超参数对算法精度的影响。研究结果表明,此算法能精准定位发生堵塞故障的喷油器,且精度不受堵塞程度的影响,故障诊断正确率可达96.7%。 展开更多
关键词 高压共轨 不同喷油器堵塞 堆叠稀疏自编码器 故障定位
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双升程电控喷油器多次喷射油量波动特性研究
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作者 许菁 兰奇 +1 位作者 范立云 魏云鹏 《内燃机学报》 EI CAS CSCD 北大核心 2024年第3期261-270,共10页
为实现船用柴油机高压共轨系统喷射的柔性和稳定控制,提出一种双升程电控喷油器,基于搭建的喷油器AMESim仿真模型,探究了喷油器不同多次喷射模式下的油量波动特性.结果表明:大升程预喷模式下的主喷量标准差随预喷量的增加先上升后下降,... 为实现船用柴油机高压共轨系统喷射的柔性和稳定控制,提出一种双升程电控喷油器,基于搭建的喷油器AMESim仿真模型,探究了喷油器不同多次喷射模式下的油量波动特性.结果表明:大升程预喷模式下的主喷量标准差随预喷量的增加先上升后下降,而小升程预喷模式下的主喷量标准差随预喷量呈幅值逐渐降低的波动变化趋势.总体上,在预喷量为161~660 mm^(3)范围,小升程预喷模式在降低主喷量波动程度方面比大升程预喷模式更占优势.预喷射采用小升程喷射模式且预喷量一定时,升程切换延迟为0.2 ms的靴形主喷模式在降低主喷量波动程度方面略优于相同主喷脉宽或相同单次喷射油量的大升程主喷模式.大升程和小升程后喷模式下的后喷量标准差随主喷脉宽和目标后喷量均呈波动变化趋势,且小升程后喷模式下的后喷量标准差波动程度更小.与大升程后喷模式相比,小升程后喷模式在降低后喷量波动程度方面更占优势. 展开更多
关键词 船用柴油机 高压共轨系统 双升程电控喷油器 多次喷射 喷油量波动
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EEMD—模糊聚类在共轨系统故障诊断上的应用研究
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作者 李良钰 苏铁熊 +1 位作者 马富康 蒲瑜 《机械设计与制造》 北大核心 2024年第6期102-105,110,共5页
高压共轨柴油机作为一种往复式运行的机械,其故障的发生是一个具有模糊性的渐变过程。针对高压共轨柴油机供油系统故障程度诊断中出现的特征值识别困难,分类界限模糊等问题,提出了一种基于EEMD(集合经验模态分解)—模糊聚类的故障诊断... 高压共轨柴油机作为一种往复式运行的机械,其故障的发生是一个具有模糊性的渐变过程。针对高压共轨柴油机供油系统故障程度诊断中出现的特征值识别困难,分类界限模糊等问题,提出了一种基于EEMD(集合经验模态分解)—模糊聚类的故障诊断方法。通过EEMD将供油系统轨压信号分解为一系列的IMF(固有模态函数),利用过零率曲线确定的特征提取准则并提取本征模态函数中的特征值,建立模糊聚类模型进行故障程度的诊断。在此基础上通过台架实验获得轨压信号,提取了相关特征值进行识别,分析了诊断结果,验证了该方法的正确性。 展开更多
关键词 高压共轨 故障诊断 集合经验模态分解 模糊聚类
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转速和高压共轨燃油系统参数对共轨管压力波动的影响
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作者 颜鑫宇 张祥山 +4 位作者 房征先 蒋金喜 张耀飞 李国祥 白书战 《内燃机与动力装置》 2024年第4期20-26,共7页
为减小柴油机高压共轨系统的共轨管内压力波动,使用AVL Boost Hydsim软件建立某柴油机高压油泵及共轨管一维仿真模型,分析柴油机转速和柱塞直径、柱塞腔容积、柱塞个数、共轨管内径等高压共轨燃油系统结构参数对共轨管压力波动的影响。... 为减小柴油机高压共轨系统的共轨管内压力波动,使用AVL Boost Hydsim软件建立某柴油机高压油泵及共轨管一维仿真模型,分析柴油机转速和柱塞直径、柱塞腔容积、柱塞个数、共轨管内径等高压共轨燃油系统结构参数对共轨管压力波动的影响。仿真结果表明:增大柴油机转速、增大高压油泵柱塞直径、减小高压油泵柱塞腔容积,可以减小轨压波动;增大共轨管内径能有效抑制压力波动;柱塞个数变化使供油次数和喷油器喷油次数一致时,可以减小轨压波动。 展开更多
关键词 共轨管 压力波动 燃油系统 转速 柱塞
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