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  • Measurement method of formaldehyde and unburned methanol emissions from a methanol engine

    • 摘要:

      The objective of this investigation is to design sampling system of collecting exhaust emission by sampling bag and absorbing formaldehyde and unburned methanol in exhaust emission with pure water, to establish measurement system in which combine with gas chromatography and liquid chromatography to separate and measure formaldehyde and unburned methanol emissions, and to measure formaldehyde and unburned methanol emission during cold start by using this measurement method from a inlet port fuel injection spark-ignition methanol engine by means of cycle-by-cycle control strategy. The results show that the combination method of gas chromatography and liquid chromatography may separate and measure the formaldehyde and unburned methanol emission effectively. The detection limits of formaldehyde and methanol for gas chromatography are 0.16μg/mL and 0.18μg/mL, respectively, and the detection limits of methanol is 0.15μg/mL for liquid chromatography. This measurement method can satisfy measurement requirement for formaldehyde and unburned methanol of methanol engine.

    • 作者:

      骏 李;Chang Ming Gong;Zhong Wang;Xiu Min Yu;Xun Jun Liu

    • 刊名:

      Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition)

    • 在线出版时间:

      2010-9

  • Effect of crankcase ventilation on particulate emissions of GDI engine

    • 摘要:

      Particulate formation in gasoline direct injection is due to short mixture time and rich mixture.Meanwhile, oil combustion will increase the amount of particulate emissions.The test indicated that oil vapor which is not separated by oil and gas separator contributes to main proportion of oil consumption.This part of oil also influences the particulate emissions.Particulate emission was measured using EEPS under different oil consumption conditions on a 4G75 GDI engine to study the effect of crankcase ventilation on the particulate emissions.Results show that an increase in oil consumption brings fast growth in particle mass under idle condition.With increasing in engine speed, the effect of oil consumption on particle generation decreases significantly.

    • 作者:

      Shijie Qiao;骏 李;Yu Liu

    • 刊名:

      Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines)

    • 在线出版时间:

      2016-9-25

  • Influence of the structure parameter of the combined charging system on intake process of automotive diesel engine

    • 摘要:

    • 作者:

      Wanchen Sun;Xunjun Liu;Zhongchang Liu;骏 李

    • 刊名:

      Qiche Gongcheng/Automotive Engineering

    • 在线出版时间:

      2002-6

  • Research on the braking system control strategy of Hybrid Electronic Bus

    • 摘要:

      As one of the key technologies of Hybrid Electronic Bus, regenerative braking technology can recover energy without changing the traditional bus braking habit. This is of vital importance in the research of regenerative braking system. Because the braking force distribution relationship between the front and rear axle of the vehicle has a remarkable influence in the braking stability,especially adding the regenerative braking force, the influence is even larger. So the anti-lock braking control strategy for the hybrid electronic vehicle is updated in this paper according to the condition of regenerative braking. The anti-lock braking control and regenerative braking control were integrated in one ECU (Electronic Control Unit) of braking control system, collecting signals of wheel rotate speed, vehicle speed, SOC and brake pedal position by CAN bus. And the output control commands are sent to the execution unit of anti-lock braking system and regenerative braking system. The effectiveness of energy regeneration and the braking stability of this strategy are tested on the off-line simulation platform.

    • 作者:

      Jishun Liu;骏 李;Yongsheng Zhang;亮 初;Liang Yao

    • 刊名:

    • 在线出版时间:

      2012

  • 不同当量比下单双点火对天然气燃烧特性的影响

    • 摘要:

      Aiming at the problems of slow combustion speed, high exhaust temperature, high heat load and prone to knock for natural gas engine with large cylinder bore, a visual constant volume combustion system suitable for dual-spark plug ignition is designed in this paper. Combining the rapid combustion technology and the natural flame luminescence method, the visualization experiment of natural gas combustion was carried out on a constant volume combustion bomb by changing the fuel-air equivalence ratio. The images of dynamic combustion process in cylinder were collected by high-speed camera, the effects of single and dual-spark plug ignition on flame propagation, combustion pressure in cylinder and combustion duration were studied by using the digital image processing technology of MATLAB. The results show that under different equivalence ratios, compared with single ignition, the dual ignition can shorten the flame propagation distance, accelerate the combustion speed in cylinder, shorten the flame development period and the main combustion period, and thus improve the thermal efficiency of combustion. Especially for the lean combustion of natural gas, the effect is very obvious, which can restrain the occurrence of misfire and knock, broaden the lean combustion limit, and is conducive to combustion stability and emission reduction.

    • 作者:

      Chang Qing Song;Wen Miao Chen;骏 李;Da Wei Qu;Hao Cui

    • 刊名:

      Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition)

    • 在线出版时间:

      2019-11-1

  • Effect of injection and ignition timings on performance and emissions from a spark-ignition engine fueled with methanol

    • 摘要:

      Optimal injection and ignition timings and the effects of injection and ignition timings on performance and emissions from a high-compression direct-injection stratified charge spark-ignition methanol engine have been investigated experimentally. The results have shown that direct-injection spark-ignition methanol engine, in which a non-uniform mixture with a stratified distribution can be formed, has optimal injection and ignition timings to obtain a good combustion and low exhaust emissions in the overall mode range. Both methanol injection timing and ignition timing have a significant effect on methanol engine performance, combustion, and exhaust emissions. At an engine speed of 1600 rpm, full load, and optimal injection and ignition timings, methanol engine can obtain shorter ignition delay, lesser cycle-by-cycle variation, the maximum in-cylinder pressure, the maximum heat release rate, and higher thermal efficiency compared to the case of non-optimized injection and ignition timings. For methanol engine, the optimization of injection timing and ignition timing can lead to an improvement of brake-specific fuel consumption of more than 10% compared to non-optimized case in the overall load range and engine speed of 1600 rpm. The best compromise between thermal efficiency and exhaust emissions is reached at optimal injection and ignition timings.

    • 作者:

      骏 李;Chang Ming Gong;Yan Su;Hui Li Dou;Xun Jun Liu

    • 刊名:

      Fuel

    • 在线出版时间:

      2010-12

  • Development of CA6DN1 13-litre diesel engine for heavy duty druck

    • 摘要:

      To meet the demand of the increased power output and the decreased fuel cost for the heavy duty vehicle under the strengthening emission legislations, a CA6DN1 13-litre diesel engine is designed as a product of high performance, low fuel consumption, low emission and long durability. The advanced CAE approach is used in the structural optimization and the coolant system optimization. The target is realized by the reasonable development scheme. This paper discusses the engine development in details.

    • 作者:

      骏 李;Peng Cheng Wang;Fang Hu;Fan Chen Meng

    • 刊名:

      Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines)

    • 在线出版时间:

      2008-12

  • Research on soot filtration and pressure drop characteristics of DPF

    • 摘要:

      An integrated DPF filtration model is proposed to study the properties of soot filtration and pressure drop, which includes deep bed filtration model, cake filtration model and pressure drop model. Research results show that the evolution of filtration can be divided into two stages named as deep bed filtration and cake filtration respectively. During deep bed filtration, soot is trapped in the filter wall, which results a rapid pressure drop gradient of 7.6 Pa/s. However, the soot quality only accounts for 1.6% of the total in whole filtration process. Compact soot layer is developed during soot filtration. And a linear increase of pressure drop with the gradient of 1.4 Pa/s during the stage. Besides, the pressure drop caused by the soot layer and cake layer are 54 and 38% respectively in the whole simulation duration.

    • 作者:

      Ying Gao;Hongqi Liu;Wei Chen;Tieqiang Fu;Maodong Fang;骏 李

    • 刊名:

    • 在线出版时间:

      2017

  • Analysis on the influence of measurement error on state of charge estimation of LiFePO4 power Battery

    • 摘要:

      The error sources of state of charge(SOC) estimation of li-ion battery based on Kalman filter is analyzed in this paper. To LiFePO4 power battery, the extremely flat part during the normal SOC range of SOC-OCV curve will require strong restriction to the voltage detection especially. This paper aims at the influence of the measuring precision of the voltage and current signal of battery management system (BMS) to SOC estimation of the li-ion battery including LiFePO4 battery. A simulation analysis is performed independently in Simulink on the assumption that other factors are under ideal conditions, in which the effects of Gaussian white noise and offset error of measurement of BMS are discussed respectively to simulate the actual vehicle condition. The principle to the precision index design of BMS is proposed according to the analysis result, in addition, a high-precision data acquisition system is developed as a precise calibration benchmark device for BMS.

    • 作者:

      Tingting Dong;骏 李;Fuquan Zhao;You Yi;Qiqian Jin

    • 刊名:

    • 在线出版时间:

      2011

  • Combustion and hydrocarbon (HC) emissions from a spark-ignition engine fueled with gasoline and methanol during cold start

    • 摘要:

      The effects of the ambient temperature and the amount of fuel injected per cycle on the cold-start firing behavior as well as the combustion and the hydrocarbon (HC) emissions of an electronically controlled inlet port injection spark-ignition (SI) engine fueled with gasoline and methanol, respectively, during the cold start were studied experimentally by means of a single-cycle fuel injection strategy. The results showed that the amount of fuel injected per cycle significantly affects the gasoline-fueled engine cold-start reliability. A proper amount of fuel injected per cycle ensures a reliable start of the gasoline-fueled engine. The ambient temperature affects most significantly the cold-start ability of the methanol-fueled engine, and the amount of methanol injected per cycle takes second place. With the ambient temperature below 16 °C, the methanol-fueled engine cannot be started reliably without auxiliary start aid even with a large amount of methanol injection under low injection pressure. Using a glow plug to heat the engine inlet manifold results in a reliable firing of the methanol-fueled engine and may realize an ideal firing in the next cycle combustion after fuel injection. The ambient temperature is closely related to the fuel vaporization and fuel-air mixture preparation, especially at cold start. With a rise in the ambient temperature, the methanol and gasoline injection amounts per cycle sufficient for the reliable firing during cold start of the engine reduce obviously and the HC emissions decrease significantly. At the same injection timing, the gasoline-fueled engine may realize an ideal firing in the next cycle combustion after fuel injection and the firing of the methanol-fueled engine occurs one cycle later than that of the gasoline-fueled engine. copyright

    • 作者:

      骏 李;Changming Gong;Bo Liu;Yan Su;Huili Dou;Xunjun Liu

    • 刊名:

      Energy & Fuels

    • 在线出版时间:

      2009-10-15

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