High Efficiency and Clean Diesel Combustion Using Double Premixed Ignition (First Report) - Development of a New Combustion Concept and its Potential of Emission Reduction

It is a very important and urgent subject that internal combustion engines have better combustion potential for clean and high efficiency performance for energy-saving future. A new combustion concept, Diesel Staggered Premixed Ignition with Accelerated oxidation (D-SPIA), was developed for lower exhaust emissions and carbon dioxide (CO₂). This concept is based on divided fuel injections before TDC. Although the D-SPIA is a type of PCCI (Premixed Charge Compression Ignition), it has a distinct feature of double premixed combustion by optimum injection quantities and staggered timing, which can achieve an ideal heat release rate for low pollutant emissions and fuel consumption.将来の省エネルギー社会に向けて、内燃機関のクリーン化・高効率化は重要かつ緊急の課題である。そこで、低燃費･低エミッションな新燃焼コンセプト:D-SPIA(Diesel Staggered Premixed Ignition with Accelerated oxidation)を構築した。D-SPIAは分割噴射を活用した二段の予混合圧縮着火が特徴であり、低エミッション･高効率な燃焼が実現可能である。