Koji Hiraya

Expansion of HCCI Operating Region by the Combination of Direct Fuel Injection, Negative Valve Overlap and Internal Fuel Reformation

Tomonori Urushihara, Koji Hiraya, Akihiko Kakuhou et al. · SAE technical papers on CD-ROM/SAE technical paper series · 2003 · 243 citations

Engineering, Automotive Engineering, Mechanical Engineering +17

A Study on Gasoline Fueled Compression Ignition Engine ∼ A Trial of Operation Region Expansion ∼

Koji Hiraya, Kazuya Hasegawa, Tomonori Urushihara et al. · SAE technical papers on CD-ROM/SAE technical paper series · 2002 · 104 citations

Engineering, Automotive Engineering, Mechanical Engineering +14

Study of an On-board Fuel Reformer and Hydrogen-Added EGR Combustion in a Gasoline Engine

Koichi Ashida, Hirofumi Maeda, Takashi Araki et al. · SAE international journal of fuels and lubricants · 2015 · 33 citations

Engineering, Automotive Engineering, Mechanical Engineering +16

Study of Antiknock Performance Under Various Octane Numbers and Compression Ratios in a DISI Engine

Ken‐ichi Okamoto, Tokuichi Ichikawa, Kenichiro Saitoh et al. · SAE technical papers on CD-ROM/SAE technical paper series · 2003 · 25 citations

Engineering, Automotive Engineering, Mechanical Engineering +17

The Effect of a Longer Stroke on Improving Fuel Economy of a Multiple-Link VCR Engine

Hirofumi Tsuchida, Koji Hiraya, Daisuke Tanaka et al. · SAE technical papers on CD-ROM/SAE technical paper series · 2007 · 19 citations

Engineering, Aerospace Engineering, Automotive Engineering +16