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Effects of Spray Internal EGR Using CO2 Gas Dissolved Fuel on Combustion Characteristics and Emissions in Diesel Engine

YANMAR Co., Ltd.-Masaki Kuribayashi, Go Asai
Doshisha University-Tomoyuki Mukayama, Yoshitaka Hattori, Eriko Matsumura, Jiro Senda
  • Technical Paper
  • 2019-32-0592
Published 2020-01-24 by Society of Automotive Engineers of Japan in Japan
We have proposed the application of Exhaust Gas Recirculation (EGR) gas dissolved fuel which might improve spray atomization through effervescent atomization instead of high injection pressure. Since EGR gas is included in the spray of EGR gas dissolved fuel, it directly contributes to combustion, and the further reduction of NOx emissions is expected rather than the conventional external EGR. In our research, since highly contained in the exhaust gas and highly soluble in the fuel, CO2 was selected as the dissolved gas to simulate EGR gas dissolved. In this paper, the purpose is to evaluate the influence of the application of CO2 gas dissolved fuel on the combustion characteristics and emission characteristics inside the single cylinder, direct injection diesel engine. As a result, by use of the fuel, smoke was reduced by about 50 to 70%, but NOx reduction does not have enough effect. However, NOx emissions is reduced with external EGR, and the effect of NOx reduction is effective by combined the external EGR and the CO2 gas dissolved fuel.
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A Study of a Lean Homogeneous Combustion Engine System with a Fuel Reformer Cylinder

YANMAR Co., Ltd.-Go Asai, Yuki Tokuoka, Thomas Bayer
Hokkaido University-Shuntaro Ishiguro, Gen Shibata, Hideyuki Ogawa, Yoshimitsu Kobashi, Yusuke Watanabe
  • Technical Paper
  • 2019-01-2177
Published 2019-12-19 by SAE International in United States
The Dual-Fuel (DF) combustion is a promising technology for efficient, low NOx and low exhaust particulate matter (PM) engine operation. To achieve equivalent performance to a DF engine with only the use of conventional liquid fuel, this study proposes the implementation of an on-board fuel reformation process by piston compression. For concept verification, DF combustion tests with representative reformed gas components were conducted. Based on the results, the controllability of the reformed gas composition by variations in the operating conditions of the reformer cylinder were discussed.
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Chemical Reaction Processes of Fuel Reformation by Diesel Engine Piston Compression of Rich Homogeneous Air-Fuel Mixture

SAE International Journal of Engines

YANMAR Co., Ltd.-Go Asai
Hokkaido University-Yusuke Watanabe, Shuntaro Ishiguro, Gen Shibata, Hideyuki Ogawa, Yoshimitsu Kobashi
  • Journal Article
  • 2017-32-0120
Published 2017-11-15 by Society of Automotive Engineers of Japan in Japan
To extend the operational range of premixed diesel combustion, fuel reformation by piston induced compression of rich homogeneous air-fuel mixtures was conducted in this study. Reformed gas compositions and chemical processes were first simulated with the chemistry dynamics simulation, CHEMKIN Pro, by changing the intake oxygen content, intake air temperature, and compression ratio. A single cylinder diesel engine was utilized to verify the simulation results. With the simulation and experiments, the characteristics of the reformed gas with respect to the reformer cylinder operating condition were obtained. Further, the thermal decomposition and partial oxidation reaction mechanisms of the fuel in extremely low oxygen concentrations were obtained with the characteristics of the gas production at the various reaction temperatures.The main reformed products were hydrogen (H2), carbon monoxide (CO), carbon dioxide (CO2), methane (CH4), and ethylene (C2H4) and the results indicated that the reforming depends on the maximum temperature in the cylinder, however, the amount of reformed gas is lower than the values predicted by the CHEMKIN simulation.
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Stress Prediction of Engine Components Resulting from an Engine Vibration

YANMAR Co., Ltd.-Masahiro Akei, Kouich Kouzato, Toshiyuki Uyama
Published 2013-10-15 by Society of Automotive Engineers of Japan in Japan
This paper describes how we predict the stress of engine components resulting from vibration of engine, using MBD (Multi Body Dynamics) and FEA (Finite Element Analysis). In a development of industrial engine, many engine models which are installed on various machines are developed. Depending on operating condition of machine, many kinds of components are designed. Therefore, in order to shorten a development period, it is important to predict accurately stress of components and evaluate its durability in the design phase. In this study, for exhaust silencer, the stress of engine components which are caused from of engine vibration is calculated by FEA and MBD and the accuracy of prediction is confirmed as compared with the experiment result. In addition, the stress of oil suction pipe is predicted. As vibrational characteristic of oil suction pipe is influenced by lube oil, virtual mass method is used in order to take into consideration the influence of fluid which is surrounding it. Finally, the fatigue life of component can be predicted for each machine, using operating data of machineā€¦
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Improvement of the Performance on the Small-Scale PCCI Engine Fueled by Natural Gas (4th Report)~Effects of Internal EGR Method on Engine Performance and Exhaust Emissions

YANMAR Co., Ltd.-Hiroyuki Ohtsubo, Toru Nakazono
University of Shiga Prefecture-Kiyoshi Kawasaki, Kazuki Hirota, Shingo Nagata, Koji Yamane
  • Technical Paper
  • 2007-08-0415
Published 2007-10-01 by Society of Automotive Engineers of Japan in Japan
In order to control the natural gas PCCI combustion, the internal EGR by means of exhaust valve re-opening (EVRO) during induction stroke was applied to a single-cylinder test engine. Combustion phasing can be controlled successfully by adjusting the EGR ratio, so that improvement of thermal efficiency and exhaust emission can be achieved. Also, results of EVRO method have been compared to those of intake-valve pilot-opening (IVPO) during exhaust stroke. It is shown that EVRO is a more useful heat-recovery method for PCCI combustion improvement than IVPO.
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Effect of Diesel Combustion With Multiple Fuel Injection on Particle Size Distribution

YANMAR Co., Ltd.-Shusuke Okada
Doshisha Univ.-Yoshihiro Hamazume, Yoshimitsu Wada, Jiro Senda, Hajime Fujimoto
  • Technical Paper
  • 2007-08-0550
Published 2007-10-01 by Society of Automotive Engineers of Japan in Japan
Newly developed diesel engine combustion leads to decrease in the particle diameter of PM and increase in the number of nano particles. Not only PM weight but also particle number should be reduced, considering the serious effect of nano particles on human health. Thus, it is important to understand the exhaust characteristic of PM for various combustion modes. This study investigates the influence of the multiple fuel injection exerted on the particle size distribution and the weight by taking into account of the mixture formation and the combustion processes.
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PCCI Combustion for Multi-Cylinder Natural Gas Engine (Second Report)~Leading Autoignition and Reduction of Cylinder-to-Cylinder Variations by Using Spark Ignition

YANMAR Co., Ltd.-Tohru Nakazono, Takayuki Shirouzu
University of Shiga Prefecture-Koji Yamane, Kiyoshi Kawasaki
  • Technical Paper
  • 2007-08-0239
Published 2007-05-23 by Society of Automotive Engineers of Japan in Japan
It was tried to operate the 4-cycle, multi-cylinder natural gas engine introduced PCCI combustion system without electric heater for intake air heating. In experiment, by using spark ignition in addition to the optimization of the compression ratio, the engine could be operated using only intake air heating with coolant water. And it was appeared that the suppression of the autoignition timing variations between cylinders owing to the independent spark timing control of each cylinder leads to the improvement of engine output, fuel economy and exhaust emissions.
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PCCI Combustion for Multi-Cylinder Natural Gas Engine (Third Report)~Engine Start and Correspondence to the Load Change by the Transition SI to PCCI Combustion

YANMAR Co., Ltd.-Tohru Nakazono, Takayuki Shirouzu
University of Shiga Prefecture-Koji Yamane, Kiyoshi Kawasaki
  • Technical Paper
  • 2007-08-0240
Published 2007-05-23 by Society of Automotive Engineers of Japan in Japan
This paper describes the engine starting and correspondence to the change of electric demand on the 4-cycle, multi-cylinder natural gas engine introduced PCCI combustion for a generator use. From experimental results, using spark ignition, controlling excess air ratio and intake air temperature could achieve stable operation although engine load changed idle to rated power. And it was also indicated those control made adaptation to the rapid change of the load possible while changing a combustion mode compared with using an electric heater for the intake air heating.