Patents by Inventor Masaaki Tamekio

Masaaki Tamekio 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).

  • Air-fuel ratio control system for automotive engine
    Patent number: 4991555
    Abstract: An air-fuel ratio control system for an automotive engine controls an air-fuel ratio at which fuel is delivered to the automotive engine to a desirable lean air-fuel ratio so as to maintain the automotive engine to operate with a predetermined degree of instability less than an allowable degree of instability. The air-fuel ratio control system sets a desirable lean air-fuel ratio to an air-fuel ratio shifted toward a side of more rich air-fuel ratios by a predetermined value from the leanest air-fuel ratio at which the automotive engine operates with a predetermined degree of instability and a lower guard of air-fuel ratio to an air-fuel ratio shifted toward a side of more lean air-fuel ratios by a predetermined value from the desirable lean air-fuel ratio.
    Type: Grant
    Filed: February 14, 1990
    Date of Patent: February 12, 1991
    Assignee: Mazda Motor Corporation
    Inventor: Masaaki Tamekio