Patents by Inventor James S. Ulstad

James S. Ulstad 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 apportionment strategy for in-cylinder dosing
    Patent number: 10794251
    Abstract: An engine has an injector communicating with a combustion chamber to introduce a plurality of dosing shots to mix with exhaust gases and regenerate an aftertreatment device downstream of the combustion chamber. An apportionment strategy can apportion a per cylinder quantity, representing the quantity of dosing fuel to introduce per cylinder per combustion cycle, among a predefined number of dosing shots each having a first per shot quantity. The strategy compares the predefined number of dosing shots with a temporal dosing window to determine if predefined number of dosing shots can be conducted within the temporal dosing window. If so, the strategy proceeds to introduce the predefined number of dosing shots and if not, the strategy may recalculate a reduced number of dosing shots and reapportions a second per shot quantity.
    Type: Grant
    Filed: September 22, 2016
    Date of Patent: October 6, 2020
    Assignee: Caterpillar Inc.
    Inventors: James S. Ulstad, Kranti K. Nellutla, Greg L. Armstrong, Steven Y. Tian, Brian P. Brennan, Sasidhar Rayasam, Anand KrishnamurthyGopalan
  • Fuel Apportionment Strategy for In-Cylinder Dosing
    Publication number: 20180080358
    Abstract: An engine has an injector communicating with a combustion chamber to introduce a plurality of dosing shots to mix with exhaust gases and regenerate an aftertreatment device downstream of the combustion chamber. An apportionment strategy can apportion a per cylinder quantity, representing the quantity of dosing fuel to introduce per cylinder per combustion cycle, among a predefined number of dosing shots each having a first per shot quantity. The strategy compares the predefined number of dosing shots with a temporal dosing window to determine if predefined number of dosing shots can be conducted within the temporal dosing window. If so, the strategy proceeds to introduce the predefined number of dosing shots and if not, the strategy may recalculate a reduced number of dosing shots and reapportions a second per shot quantity.
    Type: Application
    Filed: September 22, 2016
    Publication date: March 22, 2018
    Applicant: Caterpillar Inc.
    Inventors: James S. Ulstad, Kranti K. Nellutla, Greg L. Armstrong, Steven Y. Tian, Brian P. Brennan, Sasidhar Rayasam, Anand KrishnamurthyGopalan