Study of engine combustion in cold start in use of rich methanol blended fuel

Tetsuya Ohira (Aichi University of Technology)･Keisuke Ito･Makoto Kaneko･Hidenori Fujii･Naoyuki Suda･Yoshinari Ninomiya (Suzuki Motor)

Use of methanol is under study as carbon neutral fuel for engines. However, its properties, such as, boiling point, latent heat can be difficulties with engine combustion in cold start. In this study, with a spark ignited engine for production motorcycle, fuel vaporization in intake port, temperature distribution around engine parts, exhaust and crankcase gas emissions were investigated together with combustion stability in cold start. It was found that deep temperature drop and poor fuel vaporization in intake port caused worse combustion stability after engine start. Measured data could also suggest engine oil dilution as the other issue.

Effects of Ethanol on Combustion in Super Lean Burn Engine

Kenji Sugata･Naoyoshi Matsubara･Ryota Yamada･Koji Kitano (Toyota Motor)

In order to reduce WtW CO2 emissions from vehicles equipped with internal combustion engines, it is important to use bioethanol effectively. Lean burn engine is known as one of the means of improving thermal efficiency. In this study, the effects of ethanol blending on thermal efficiency, knocking, emissions, and combustion duration within the range of λ=1 to 2.5 are analyzed.

Alcohol Diffusive Combustion Technique as an Alternative Diesel Combustion (Third Report)
-Requirements of the diesel pilot injection for ethanol diffusive combustion by dual fuel injector-

Yoshifumi Wakisaka･Kenji Fukui･Teruaki Kondo･Yoshiyuki Mandokoro･Kazuaki Nishikawa･Takayuki Fuyuto (Toyota Central R&D Labs.)･Kenji Date･Yusuke Ueda･Satoshi Sugawara (DENSO)

Alcohol fuel, namely methanol and ethanol, are promising fuel for diffusive combustion in heavy-duty diesel engines, while they are difficult to self-ignite. In this study, a prototype dual-fuel injector that injects diesel fuel as an ignition source from the same nozzle with ethanol was developed. Requirements for the pilot injection with a high diesel fuel content to ignite the main injection with a high ethanol content were identified experimentally by in-cylinder observations and a single-cylinder direct injection diesel engine test.

Effects of Port Fuel Injection of Liquid Annmonia on Intake Air Mass and Combustion Characteristics in a Spark-Ignition Engine

Mitsuaki Ohtomo･Hideaki Masui･Hiroshi Miyagawa (Toyota Central R&D Labs.)･Norinosuke Nakatani･Tadashi Takeuchi (Toyota Industries Corporation)

The effects of intake air cooling with the latent heat of port-injected liquid ammonia in a spark-ignition engine on intake air mass and combustion characteristics were investigated using simulations and experiments. A decrease in intake air temperature resulted in an increase in intake air mass and improved IMEP, without leading to longer combustion duration or an increase in unburned ammonia. Furthermore, it was found that the increase in intake air mass varied depending on the injection timing of the liquid ammonia.