Takahiko Fujiwara
Toyota
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Featured researches published by Takahiko Fujiwara.
SAE transactions | 2003
Toru Kidokoro; Koichi Hoshi; Keizo Hiraku; Koichi Satoya; Takashi Watanabe; Takahiko Fujiwara; Hideki Suzuki
A new exhaust emission control system has been developed which complies with the worlds most severe emission standard: CARB PZEV. Leaner combustion in cold condition was enabled and rapid warm-up of a close-coupled catalyst was realized by utilizing a newly developed Intake Air Control Valve (IACV) system and hyper-atomization fuel injector. In addition, the newly developed HC adsorbing type 3-way catalyst realized cold HC reduction at lower cost. For further reduction of the exhaust emission, the Variable Valve Timing-Intelligent (WT-i) system was positively operated immediately after the cold start. By the suitable operation of Variable Valve Timing (VVT), the blow-back from the cylinder enhanced the fuel atomization and re-burning of remaining unburned hydrocarbons (HCs), and increased in-cylinder residual gas reduces NOx. In addition, to pursue a better catalyst conversion rate after warm-up, the oxygen (O 2 ) sensor downstream of the close-coupled catalyst was improved to a new type. We have thus developed an exhaust emission control system with less emission variability to comply with the 15 years or 150k miles warranty.
Archive | 1988
Takahiko Fujiwara; Koichi Kimura; Makoto Tomimatsu; Junichi Suzuki
Archive | 2007
Hiroaki Mizoguchi; Takahiko Fujiwara; Kunihiko Nakata; Kenji Sakurai; Hiroki Ichinose; Masaaki Kawai; Atsunori Hirata
Archive | 2016
Akemi Satou; Masahiko Takeuchi; Keizo Hiraku; Yusuke Kawamura; Takahiko Fujiwara; Tadashi Suzuki; Naoki Takahashi
Archive | 2010
Makoto Tomimatsu; Takahiko Fujiwara
Archive | 2008
Norihisa Nakagawa; Takahiko Fujiwara; Taiga Hagimoto; Junichi Kako; Naoto Kato; Shuntaro Okazaki
Archive | 2007
Hiroaki Mizoguchi; Takahiko Fujiwara
Archive | 2006
Takahiko Fujiwara; Hiroaki Mizoguchi; 紘晶 溝口; 孝彦 藤原
Archive | 2005
Takahiko Fujiwara; Kunihiko Nakata; Hiroki Ichinose; Atsunori Hirata
Archive | 2010
Koji Aso; Takahiko Fujiwara; Hiroshi Tanaka