[Keynote Address] Joint Research on CO₂ Reduction between Petroleum Association of Japan and Japan Automobile Manufacturers Association (AOI Project 2nd Report)

Hideaki Sugano･Takashi Kaneko (ENEOS)･Takae Okamoto (Cosmo Oil)･Tatsuya Suzuki (Hino Motors)･Masato Matsuki (Honda Motor)･Hironori Shodai (Idemitsu Kosan)･Tomoaki Kakihara (Isuzu Motors)･Tsutomu Kikuchi (Nissan Motor)･Ryuichiro Kamioka･Hitoshi Hayashi･Kiyoo Hirose (Toyota Motor)

The Petroleum Association of Japan (PAJ) and the Japan Automobile Manufacturers Association (JAMA) are conducting joint research (*AOI project) aimed at reducing CO₂ emissions by optimizing the combination of future engine combustion methods and future fuels in anticipation of the market around 2030. In this project, the basic research phase from FY2020 to FY2022 was successfully achieved, and the verification research phase (first stage) is currently ongoing.

Effects of Light Olefins on the Properties of Gasoline Premixed Laminar and Turbulent Flames

Takato Kataoka･Tsuyoshi Ohama･Hiroshi Maeyama･Ekenechukwu Chijioke Okafor･Toshiaki Kitagawa (Kyushu University)

Effects of light olefins on the properties of gasoline premixed laminar and turbulent flames were investigated by the experiments using a constant volume combustion chamber. The laminar burning velocity was increased and the Markstein number was decreased by the light olefin components. The ratio of the turbulent burning velocity to laminar one was increased by the light olefin components.

Evaluation of New Fuel Components and New Surrogates for Next-Generation Gasoline Development using a High-Pressure Shock Tube (Part II)

Tomohiro Hamasaki･Riku Sugiura･Ryohei Hirai･Tatsumi Ueda･Kazuo Takahashi (Sophia University)

In order to achieve short- and medium-term targets for preventing global warming, the efficiency of internal combustion engine vehicles needs to be improved. At the same time, it is also necessary to develop a next-generation gasoline that can fully draw out engine performance. In the present study, following on from last year, we evaluated the fuel performance of new surrogates that contain a large amount of light olefins and biofuels using a high-pressure shock tube, and discussed the interaction of these components.

Effects of Different Engine Speed and Load on Lean Limit of High-Compression Ratio Spark Ignition Engine using Light Olefin Fuel

Akira Yamagiwa･Kentaro Nakagawa･Kaito Yasui･Yuya Ohmori･Satoshi Sakaida･Yasuyuki Sakai･Kotaro Tanaka (Ibaraki University)

CO₂ emissions from vehicles with internal combustion engines must be reduced, and the optimum combination of next-generation fuels and engine combustion technologies has to be investigated. In this study, the effects of engine speed and load on the lean limit of light olefin fuel were evaluated. As a result, the thermal efficiency was the highest and the lean limit most expanded under high-load, medium-engine speed conditions.

Prediction of WLTC Mode Drive Fuel Consumption of Power-Split HEV and the Optimized Modeling

Fuguo Xu･Yasuo Moriyoshi･Tatsuya Kuboyama･Hong Huang (Chiba University)

This paper explores the possibility of improving fuel economy for power-split HEVs by modeling the powertrain and designing the energy optimization strategy. Firstly, an HEV simulator in MATLAB/Simulink is built with physical parameters from industry and the accuracy performance of this simulator is verified by experiment data collected from the chassis dynamometer bench system. Then, an optimal control problem is formulated to minimize the fuel consumption with dynamic modeling-constraint of battery, and WLTC drive fuel consumption is predicted based on dynamic programming. Finally, the fuel consumption performances of simulation and experiment are compared.

Study on Effect of Synthetic Fuels with Different Properties on Heavy-Duty Diesel Engine Performance via Combustion Visualization Technique

Byungju Shin･Toshiaki Shinozaki (New A.C.E Institute)･Takashi Tanaka (Persol Cross Technology)･Fumihiro Kawaharazuka･Noboru Uchida (New A.C.E Institute)

Paraffinic fuel has been received much attention and often studied its promising potential as a future low-carbon and cleaner emissions’ diesel alternative fuel by its less soot characteristics. However, the effects of each fuel property, which varies in a wide range along with other properties variation, on diesel combustion and emission characteristics has not been revealed yet. That could make the preferrable fuel design difficult. This study investigated each fuel property effect on combustion and exhaust emission characteristics by adding several new fuels test to the previous study, and discussed the difference in combustion phenomena by utilizing combustion visualization technique.