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Research on the Control Strategy of Variable Nozzle Turbocharger for natural gas engine

Journal of Beijing Institute of Technology 2010年第1期19卷 37-41页

作者：郝利君黄英张付军葛蕴珊 School of Mechanical engineering Beijing Institute of Technology

A variable nozzle turbocharger （VNT） was applied to a 2.2-liter L4 natural gas engine,and a VNT control system was designed to operate *** on VNT matching test results,a VNT control strategy was studied,in which VNT adjustment is carried out through pre-calibrated VNT handling rod position,combined with a closed-loop target boost pressure feedback using proportional-integral-derivative（PID） *** results showed that the VNT control system presented in this thesis can lead to optimized performance of VNT,increase engine volumetric efficiency over a wide speed range,improve engine dynamic characteristics and upgrade economic performance.

关键词： natural gas engine variable nozzle turbocharger (VNT) proportional-integral-derivative(PID) control control strategy experimental study

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Research on the application technique of the natural gas engine with direct injection

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Journal of Energy and Power engineering 2009年第3期2卷 43-46页

作者： PENG Yi-qiang WU Qiong XU Zheng-wei School of Transportation and Automotive engineering Xihua University Chengdu 610039 China

Based on the analysis of the advantages of the natural gas engine with Direct Injection （NGEDI） and the state of the art of the research in this area, the authors point out that, the NGEDI with high pressure is one potential selection and will have a good application prospects. Through investigation experiment and simulation results, the key techniques are put foreword for deployment of the NGEDI and some solutions are given.

关键词： natural gas engine direct injection spark ignition

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Research and Implementation of Driver Module of Solenoid Injectors for natural gas engine

Research and Implementation of Driver Module of Solenoid Inj...

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2019中国汽车工程学会年会

作者： Sui Jianpeng Yang Li Zhu Hao Lei Ao Zhou Shiying Wang Qiang Intelligent and Connected Vehicle Development China FAW Group Corporation New Energy Vehicle Development China FAW Group Corporation

The driver module of solenoid injectors featured with low cost and high reliability has been developed for overcoming some technical *** problems include the difficulty of opening the solenoid injectors of natural gas engine in low temperature environment,the inability to identify mechanical stuck fault and multi-cylinders overlapping *** driver module selects the driving current waveform mode through the mode selection *** the automotive is in a cold start condition,the driving current waveform of the solenoid injector is changed from the nonnal driving current wavefonn to the cold start driving current wavefonn,and the peak current value of driving current wavefonn is increased to improve the start-up performance of solenoid *** on the change of voltage waveform in the driving circuit of solenoid injectors,the monitoring of mechanical stuck state of solenoid injectors is *** driving channel is independent to meet the requirement of multi-cylinders overlapping injection,and single driving voltage and single side driver were adopted in driving stage to realize low *** feasibility and validity of the driver module are verified by the DV and PV *** test results show that the driving current waveform parameters of the driver module meet the design specifications,and can accurately identify the mechanical stuck state,and its performance meets the product technical specifications.

关键词： natural gas engine solenoid injector driving current cold start mechanical stuck

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Performance Study for Miller Cycle natural gas engine Based on GT-Power

Performance Study for Miller Cycle Natural Gas Engine Based ...

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作者： Songsong Song Hongguang Zhang Beijing University of Technology

In order to improve the thermal efficiency of natural gas engine and reduce the NOx emission from engine,this paper presented the technical route which applied Miller cycle to turbocharged lean-burn natural gas engine. GT-Power software was used to model the turbocharged natural gas engine,and simulation research based on Miller cycle was performed according to various engine loads in the engine speed range of 2000-5000 rpm. The simulation results showed that,under part load(50% of the engine full load) operating conditions of the turbocharged lean-burn natural gas engine,compared with Otto cycle,Miller cycle can reduce the brake specific fuel consumption(BSFC) and NOx emission. Under high load and low speed as well as moderate load and high speed operating conditions,Miller cycle can effectively reduce the BSFC. Under high load and low speed or high speed operating conditions,the NOx emission can be reduced apparently.

关键词： natural gas engine simulation miller cycle

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Influence of Mixture gas Conditions on the Laminar Combustion Characteristics of natural gas

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Journal of Thermal Science 2024年第3期33卷 1231-1241页

作者： LOU Diming ZHU Kan ZHANG Yunhua REN Yedi TAN Piqiang FANG Liang FAN Lanlan School of Automotive Studies Tongji UniversityShanghai201804China Ji’nan Power Co.Ltd Sinotruk GroupJi’nan250200China

natural gas is a promising alternative fuel for the internal combustion engine,and natural gas engine has become an efficient and feasible measure to deal with the energy shortage and climate *** the laminar flame characteristics are the foundation of the turbulent flame,the laminar flame characteristics of natural gas have a significant impact on the combustion status and efficiency of the engine.A visual constant volume bomb was used to study the influence of the gas components,different excess air coefficient(λ),and initial conditions on the laminar combustion characteristics of natural *** experimental results showed that when the initial pressure and temperature were 0.1 MPa and 300 K respectively,compared to propane,ethane had a remarkable influence on the equivalent-combustion laminar-combustion-speed,with an average increase of approximately 5.1%for every 2.5%increase in the ethane *** laminar combustion velocity of the natural gas under different excess air coefficients had a maximum value at aboutλ=1.0,and the Markstein length of the flame decreased with the increase of theλ.The increase in the initial pressure of the mixture resulted in a decrease in the equivalent-combustion laminar-combustion-speed of the flame,a significant decrease in the Markstein *** increase of the initial temperature of the mixture led to a rapid increase of the equivalent-combustion laminar-combustion-speed,but the effect on the flame Markstein length was not dominant.

关键词： constant volume bomb natural gas engine combustion characteristics laminar combustion velocity Markstein length

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Analysis of Non-Selective Catalyst Reduction Performance with Dedicated Exhaust gas Recirculation

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Advances in Chemical engineering and Science 2022年第2期12卷 114-129页

作者： Chris A. Van Roekel David T. Montgomery Jaswinder Singh Daniel B. Olsen Energy Institute Colorado State University Fort Collins USA Caterpillar Inc Peoria USA

Rich burn industrial natural gas engines offer best in class post catalyst emissions by using a non-selective catalyst reduction aftertreatment technology. However, they operate with reduced power density when compared to lean burn engines. Dedicated exhaust gas recirculation (EGR) offers a possible pathway for rich burn engines to use non-selective catalyst reduction aftertreatment technology without sacrificing power density. In order to achieve best in class post catalyst emissions, the precious metals and washcoat of a non-selective catalyst must be designed according to the expected exhaust composition of an engine. In this work, a rich burn industrial natural gas engine operating with dedicated EGR was paired with a commercially available non-selective catalyst. At rated brake mean effective pressure (BMEP) the air-fuel ratio was swept between rich and lean conditions to compare the catalyst reduction efficiency and post catalyst emissions of rich burn and dedicated EGR combustion. It was found that due to low oxides of nitrogen (NOx) emissions across the entire air-fuel ratio range, dedicated EGR offers a much larger range of air-fuel ratios where low regulated emissions can be met. Low engine out NOx also points towards a possibility of using an oxidation catalyst rather than a non-selective catalyst for dedicated EGR applications. The location of the NOx-CO tradeoff was shifted to more rich conditions using dedicated EGR.

关键词： natural gas engine Rich Burn Dedicated Exhaust gas Recirculation Catalyst

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