Noriyuki Maekawa
Hitachi
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Noriyuki Maekawa.
Journal of Engineering for Gas Turbines and Power-transactions of The Asme | 2012
Motoyuki Abe; Noriyuki Maekawa; Yoshihito Yasukawa; Tohru Ishikawa; Yasuo Namaizawa; Hideharu Ehara
We developed a new injector for direct injection gasoline engines that reduce the exhaust emissions and help to reduce fuel consumption. The newly developed actuator in this injector has two features. One is a bounce-less valve closing mechanism, and the second is quick-response moving parts. The first feature, the bounce-less valve closing mechanism, can prevent ejecting a coarse droplet, which causes unburned gas emission. The new actuation mechanism realizes the bounce-less valve closing. We analyzed the valve motion and injection behavior. The second feature, the quick response actuator, achieves a smaller minimum injection quantity. This feature assists in reducing the fuel consumption under low load engine conditions. The closing delay time of the needle valve is the dominant factor of the minimum injection quantity because the injection quantity is controlled by the duration time of the valve opening. The new actuator movements can be operated with a shorter closing delay time. The closing delay time is caused by a magnetic delay and kinematic delay. A compact magnetic circuit of the actuator reduces the closing delay time by 26%. In addition, the kinematic delay was improved when the hydraulic resistance was reduced by 9%. As a result, the new injector realizes reduction of the minimum injection quantity by 25% compared to a conventional injector.Copyright
Archive | 2002
Makoto Yamakado; Noriyuki Maekawa; Kiyotaka Ogura; Kazutaka Hino; Tohru Ishikawa
Archive | 2000
Motoyuki Abe; Yasuhisa Hamada; Toru Ishikawa; Yuzo Kadomukai; Hiromasa Kubo; Noriyuki Maekawa; Toshio Takahata; Makoto Yamakado; 博雅 久保; 典幸 前川; 元幸 安部; 山門 誠; 泰久 濱田; 石川 亨; 裕三 門向; 敏夫 高畑
Archive | 2012
Ryo Kusakabe; Motoyuki Abe; Hideharu Ehara; Tohru Ishikawa; Noriyuki Maekawa; Takuya Mayuzumi
Archive | 2008
Motoyuki Abe; Masahiko Hayatani; Tohru Ishikawa; Takehiko Kowatari; Noriyuki Maekawa
Archive | 2004
Noriyuki Maekawa; Motoyuki Abe; Makoto Yamakado; Toru Ishikawa; Kooji Shibata
Archive | 2008
Motoyuki Abe; Masahiko Hayatani; Tohru Ishikawa; Takehiko Kowatari; Noriyuki Maekawa; Yasuo Namaizawa; Yusuke Irino
Archive | 2005
Noriyuki Maekawa; Motoyuki Abe; Kenichiro Tokuo; Takehiko Kowatari; Tohru Ishikawa; Toshiyuki Innami; Kazuhiko Hanawa; Satoshi Shimada
Archive | 2007
Motoyuki Abe; Masahiko Hayatani; Toru Ishikawa; Takehiko Kowatari; Noriyuki Maekawa; 典幸 前川; 元幸 安部; 武彦 小渡; 政彦 早谷; 亨 石川
Archive | 2007
Yoshihito Yasukawa; Eiji Ishii; Noriyuki Maekawa; Motoyuki Abe; Hiroshi Yamada; Nobuaki Kobayashi; Takahiro Saito