Patents by Inventor Hirokimi Koyama

Hirokimi Koyama 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).

  • Control device for vehicle
    Patent number: 8948987
    Abstract: An internal combustion engine 1 at a standstill of a vehicle after cold starting can switch its combustion mode to a homogenous combustion mode or a stratified combustion mode. An operation range of the stratified combustion at the standstill of the vehicle after cold starting is expanded relative to an operation range of the homogenous combustion at the standstill of the vehicle after cold starting as an inclination of the vehicle decreases. With this technique, the operation range of the stratified combustion can be expanded while assuring an intake air negative pressure required for achieving the brake performance, so that HC reduction at the standstill of the vehicle after cold starting is obtained.
    Type: Grant
    Filed: August 9, 2011
    Date of Patent: February 3, 2015
    Assignee: Nissan Motor Co., Ltd.
    Inventors: Tomoya Mori, Junso Ichiba, Shinichi Kobayashi, Yayoi Okumura, Tomohiko Takahashi, Masashi Ono, Keisuke Hamano, Masayuki Tomita, Toshiya Kouno, Ritsuo Satou, Hirokimi Koyama, Toshio Takahata, Masayuki Shimizu, Yuuichi Iriya
  • CONTROL DEVICE FOR VEHICLE
    Publication number: 20130151091
    Abstract: An internal combustion engine 1 at a standstill of a vehicle after cold starting can switch its combustion mode to a homogenous combustion mode or a stratified combustion mode. An operation range of the stratified combustion at the standstill of the vehicle after cold starting is expanded relative to an operation range of the homogenous combustion at the standstill of the vehicle after cold starting as an inclination of the vehicle decreases. With this technique, the operation range of the stratified combustion can be expanded while assuring an intake air negative pressure required for achieving the brake performance, so that HC reduction at the standstill of the vehicle after cold starting is obtained.
    Type: Application
    Filed: August 9, 2011
    Publication date: June 13, 2013
    Inventors: Tomoya Mori, Junso Ichiba, Shinichi Kobayashi, Yayoi Okumura, Tomohiko Takahashi, Masashi Ono, Keisuke Hamano, Masayuki Tomita, Toshiya Kouno, Ritsuo Satou, Hirokimi Koyama, Toshio Takahata, Masayuki Shimizu, Yuuichi Iriya
  • System for measuring amount of air introduced into combustion chamber of internal combustion engine with avoiding influence of temperature dependent air density variation and pulsatile air flow
    Patent number: 4892072
    Abstract: A system for measuring intake air amount to be introduced into an engine cylinder employs a throttle angle sensor as a basic intake air flow amount indicative factor. Basic intake air flow amount is derived on the basis of a throttle valve angular position and an engine speed. The basic intake air flow amount is corrected with taking delay factor to introduce the intake air past the throttle valve into the engine cylinder, and a temperature dependent factor compensating variation of air density depending upon the temperature condition.
    Type: Grant
    Filed: May 19, 1988
    Date of Patent: January 9, 1990
    Assignee: Nissan Motor Company, Limited
    Inventors: Hiromichi Miwa, Hatsuo Nagaishi, Ichirou Kishiki, Hirokimi Koyama