Patents by Inventor Akihiro Nakashima

Akihiro Nakashima 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).

  • Fuel evaporative emission amount detection system
    Patent number: 5259353
    Abstract: A detecting system for condition of a fuel evaporative emission generated in a fuel tank, includes a pressure sensor and a three-way valve for selectively connecting the pressure sensor to atmosphere and the fuel tank. The pressure sensor is initially communicated with the atmosphere to detect an atmospheric pressure P.sub.a (step 110), and subsequently communicated with the fuel tank to detect an internal pressure P.sub.f of the fuel tank (step 130). Based on the atmospheric pressure P.sub.a and the internal pressure P.sub.f of the fuel tank, an amount EVP of the fuel evaporative emission generated in the fuel tank is derived through a map look-up against a preset map (step 150).
    Type: Grant
    Filed: April 10, 1992
    Date of Patent: November 9, 1993
    Assignee: Nippondenso Co., Ltd.
    Inventors: Kazuhiro Nakai, Akihiro Nakashima, Hisashi Iida
  • Gaseous fuel flow rate detecting system
    Patent number: 5259355
    Abstract: A fuel evaporative emission flow rate detecting system is capable of detecting a small flow rate of the fuel evaporative emission. The system includes an electromagnetic valve (22) in a communication passage (21). The pressure of the fuel evaporative emission in the fuel tank is detected by means of a magnetic flux detector or so forth. A control circuit is responsive to the pressure of the fuel evaporative emission reaching 15 mmHg, for example, while the communication passage (21) is held closed, to open the communication passage (21). On the other hand, the control circuit closes the communication passage when the pressure of the fuel evaporative emission becomes lower than or equal to 8 mmHg. Depending on a period, in which the communication passage (21) is held open, the flow rate of the fuel evaporative emission is calculated.
    Type: Grant
    Filed: April 7, 1992
    Date of Patent: November 9, 1993
    Assignees: Nippondenso Co., Ltd., Ubukata Industries Co., Ltd.
    Inventors: Akihiro Nakashima, Hisashi Iida, Shigenori Isomura, Hideki Koseki, Takao Tsuji
  • Self-diagnosis apparatus in a system for prevention of scattering of fuel evaporation gas
    Patent number: 5251477
    Abstract: Disclosed is a self-diagnosis apparatus in a fuel evaporation gas scattering preventing system in an internal combustion engine.
    Type: Grant
    Filed: February 25, 1991
    Date of Patent: October 12, 1993
    Assignee: Nippondenso Co., Ltd.
    Inventors: Akihiro Nakashima, Shigenori Isomura, Satoru Namizaki, Hidehiko Inoue