Patents by Inventor Choy Yap

Choy Yap 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).

  • Method and apparatus configured to maintain a desired engine emissions level
    Patent number: 6662795
    Abstract: The present invention is configured to maintain a desired emissions level of an engine having an intake manifold and an exhaust manifold, and an exhaust stack is disclosed. The method includes the steps of establishing a desired emissions level, establishing an engine speed, establishing an engine load, establishing at least one characteristic of one of an intake air and an exhaust gas, and determining a fuel command in response to the engine speed, the engine load, and the desired emissions level, the fuel command resulting in the engine maintaining the desired emissions level.
    Type: Grant
    Filed: August 20, 2001
    Date of Patent: December 16, 2003
    Assignee: Caterpillar Inc
    Inventors: Darryl D. Baldwin, Sean R. Strubhar, Choy Yap
  • Method and apparatus configured to maintain a desired engine emissions level
    Publication number: 20030034018
    Abstract: The present invention is configured to maintain a desired emissions level of an engine having an intake manifold and an exhaust manifold, and an exhaust stack is disclosed. The method includes the steps of establishing a desired emissions level, establishing an engine speed, establishing an engine load, establishing at least one characteristic of one of an intake air and an exhaust gas, and determining a fuel command in response to the engine speed, the engine load, and the desired emissions level, the fuel command resulting in the engine maintaining the desired emissions level.
    Type: Application
    Filed: August 20, 2001
    Publication date: February 20, 2003
    Inventors: Darryl D. Baldwin, Sean R. Strubhar, Choy Yap