Patents by Inventor Chikao Kunimasa

Chikao Kunimasa 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).

  • Apparatus for detecting malfunction in fuel evaporative prurge system
    Patent number: 5313925
    Abstract: A malfunction detection apparatus for detecting a malfunction in an evaporated fuel purge system in which fuel vapor from a fuel tank is adsorbed in an adsorbent in a canister and the adsorbed fuel vapor in the adsorbent is purged into an intake passage of an engine. The apparatus includes a detection part for detecting a concentration of fuel in the fuel vapor purged into the intake passage so that a change in the detected fuel concentration from a time when a purge cutting is performed to a time when a purging is performed after the purge cutting has been performed is detected, and a discrimination part for determining whether there is a malfunction in the system on the basis of the change in the detected fuel concentration by the detection part.
    Type: Grant
    Filed: May 13, 1993
    Date of Patent: May 24, 1994
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takayuki Otsuka, Nobuaki Kayanuma, Kouichi Osawa, Hironori Okamizu, Chikao Kunimasa
  • Apparatus for detecting malfunction in evaporated fuel purge system
    Patent number: 5230319
    Abstract: A malfunction detection apparatus for detecting a malfunction in an evaporated fuel purge system in which fuel vapor from a fuel tank is adsorbed in an adsorbent in a canister and the adsorbed fuel vapor in the adsorbent is purged into an intake passage of an engine. The apparatus includes a detection part for detecting a concentration of fuel in the fuel vapor purged into the intake passage so that a change in the detected fuel concentration from a time when a purge cutting is performed to a time when a purging is performed after the purge cutting has been performed is detected, and a discrimination part for determining whether there is a malfunction in the system on the basis of the change in the detected fuel concentration by the detection part.
    Type: Grant
    Filed: October 4, 1991
    Date of Patent: July 27, 1993
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Takayuki Otsuka, Nobuaki Kayanuma, Kouichi Osawa, Hironori Okamizu, Chikao Kunimasa