Patents by Inventor Martin John Ledger

Martin John Ledger 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 of operating a diesel engine system having LNT and SCR aftertreatment devices
    Patent number: 9316137
    Abstract: A method of operating a diesel engine 10 having LNT 11 and SCR 13 aftertreatment devices arranged in series to receive exhaust gas from the engine is disclosed in which the engine is operated in a rich early injection mode to generate ammonia in the LNT for storage in the SCR located downstream from the LNT. This reduces the amount of soot produced permitting longer operation of the engine in rich early injection mode and further may reduce the use of PGM material in the LNT and increase the amount of ammonia for use in the SCR.
    Type: Grant
    Filed: December 12, 2013
    Date of Patent: April 19, 2016
    Assignee: Ford Global Technologies, LLC
    Inventors: Khizer Tufail, Mark Stephen Brogan, Haiwen Song, Martin John Ledger, Peter Graham Eastwood
  • METHOD OF OPERATING A DIESEL ENGINE SYSTEM HAVING LNT AND SCR AFTERTREATMENT DEVICES
    Publication number: 20140157760
    Abstract: A method of operating a diesel engine 10 having LNT 11 and SCR 13 aftertreatment devices arranged in series to receive exhaust gas from the engine is disclosed in which the engine is operated in a rich early injection mode to generate ammonia in the LNT for storage in the SCR located downstream from the LNT. This reduces the amount of soot produced permitting longer operation of the engine in rich early injection mode and further may reduce the use of PGM material in the LNT and increase the amount of ammonia for use in the SCR.
    Type: Application
    Filed: December 12, 2013
    Publication date: June 12, 2014
    Applicant: FORD GLOBAL TECHNOLOGIES, LLC
    Inventors: Khizer Tufail, Mark Stephen Brogan, Haiwen Song, Martin John Ledger, Peter Graham Eastwood