Patents by Inventor Yasuhiro Ohtsubo

Yasuhiro Ohtsubo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Internal combustion engine and control method of the same
    Patent number: 6763799
    Abstract: An internal combustion is capable of switching, during engine operation, between a low-temperature combustion state in which an intake air with a high EGR rate is burned to operate the engine, and a normal combustion state in which an intake air with a low EGR rate is burned to operate the engine. In the internal combustion engine, a pilot injection is executed in addition to a main fuel injection, and furthermore the execution of the pilot injection is restricted during the engine operation with a combustion state switched to the low-temperature combustion state.
    Type: Grant
    Filed: November 29, 2002
    Date of Patent: July 20, 2004
    Assignees: Toyota Jidosha Kabushiki Kaisha, Denso Corporation, Kabushiki Kaisha Toyota Jidoshokki
    Inventors: Takekazu Ito, Hiroki Matsuoka, Tatsumasa Sugiyama, Yasuhiro Ohtsubo, Taro Aoyama, Jun Tahara, Mamoru Oki, Masakuni Yokoyama, Hideyuki Kusatugu, Keiichi Mizuguchi
  • Exhaust emission control device of internal combustion engine
    Patent number: 6619035
    Abstract: A NOx catalyst in the exhaust passage of an internal combustion engine is capable of lean burn and adapted to release and reduce absorbed NOx by a reducing agent. Reducing agent supplier is provided in the exhaust passage on the upstream side of the NOx catalyst. A load detector detects the load of an internal combustion engine. Reducing agent addition controller controls the reducing agent addition period and the reducing agent addition interval based on the load of the internal combustion engine, whereby sufficient reducing agent is supplied to the NOx catalyst side independently of the operating condition.
    Type: Grant
    Filed: March 15, 2002
    Date of Patent: September 16, 2003
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Hiroki Matsuoka, Souichi Matsushita, Yukihiro Tsukasaki, Kotaro Hayashi, Shinobu Ishiyama, Yasuhiro Ohtsubo, Naofumi Magarida, Masaaki Kobayashi, Daisuke Shibata, Akihiro Negami, Tomihisa Oda, Yasuo Harada, Tomoyuki Ono
  • Internal combustion engine and control method of the same
    Publication number: 20030116123
    Abstract: An internal combustion is capable of switching, during engine operation, between a low-temperature combustion state in which an intake air with a high EGR rate is burned to operate the engine, and a normal combustion state in which an intake air with a low EGR rate is burned to operate the engine. In the internal combustion engine, a pilot injection is executed in addition to a main fuel injection, and furthermore the execution of the pilot injection is restricted during the engine operation with a combustion state switched to the low-temperature combustion state.
    Type: Application
    Filed: November 29, 2002
    Publication date: June 26, 2003
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Takekazu Ito, Hiroki Matsuoka, Tatsumasa Sugiyama, Yasuhiro Ohtsubo, Taro Aoyama, Jun Tahara, Mamoru Oki, Masakuni Yokoyama, Hideyuki Kusatugu, Keiichi Mizuguchi
  • Exhaust emission control device of internal combustion engine
    Publication number: 20020148219
    Abstract: The present invention is provided with an NOx catalyst 17 provided in the exhaust passage of an internal combustion engine capable of lean burn and adapted to release and reduce absorbed NOx by a reducing agent, a reducing agent supplying means 19 provided in the exhaust passage on the upstream side of the NOx catalyst 17, a load detecting means for detecting the load of an internal combustion engine 1, and a reducing agent addition control means for controlling the reducing agent addition period and the reducing agent addition interval on the basis of the load of the internal combustion engine 1. The addition period and the addition interval for the reducing agent are controlled taking into account, for example, the degree to which reducing agent adheres to the wall surface in the exhaust passage depending on the velocity, temperature, etc.
    Type: Application
    Filed: March 15, 2002
    Publication date: October 17, 2002
    Inventors: Hiroki Matsuoka, Souichi Matsushita, Yukihiro Tsukasaki, Kotaro Hayashi, Shinobu Hshiyama, Yasuhiro Ohtsubo, Naofumi Magarida, Masaaki Kobayashi, Daisuke Shibata, Akihiro Negami, Tomihisa Oda, Yasuo Harada, Tomoyuki Ono