Patents by Inventor Brian P. Liimatta

Brian P. Liimatta 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).

  • NOx sensor diagnostic for an exhaust aftertreatment system
    Patent number: 10156176
    Abstract: A method for diagnosing NOx sensors in an exhaust aftertreatment system includes suspending reductant dosing in an exhaust aftertreatment system; purging a reductant deposit in a selective catalytic reduction (SCR) system of the exhaust aftertreatment system; adjusting at least one of an ignition timing and an engine speed for an engine to adjust an engine out nitrogen oxide (NOx) amount; receiving measured SCR inlet NOx data from a SCR inlet NOx sensor and measured SCR outlet NOx data from a SCR outlet NOx sensor; determining a phase shift between the measured SCR inlet and SCR outlet NOx data; applying the determined phase shift to the SCR outlet NOx data; and determining a diagnostic feature based on the SCR inlet NOx data and the phase shifted SCR outlet NOx data regarding a state of the SCR inlet and outlet NOx sensors.
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: December 18, 2018
    Assignee: Cummins, Inc.
    Inventors: Andrew W. Osburn, Christopher Ferguson, Tony James Hall, Brian P. Liimatta
  • NOx SENSOR DIAGNOSTIC FOR AN EXHAUST AFTERTREATMENT SYSTEM
    Publication number: 20180003098
    Abstract: A method for diagnosing NOx sensors in an exhaust aftertreatment system includes suspending reductant dosing in an exhaust aftertreatment system; purging a reductant deposit in a selective catalytic reduction (SCR) system of the exhaust aftertreatment system; adjusting at least one of an ignition timing and an engine speed for an engine to adjust an engine out nitrogen oxide (NOx) amount; receiving measured SCR inlet NOx data from a SCR inlet NOx sensor and measured SCR outlet NOx data from a SCR outlet NOx sensor; determining a phase shift between the measured SCR inlet and SCR outlet NOx data; applying the determined phase shift to the SCR outlet NOx data; and determining a diagnostic feature based on the SCR inlet NOx data and the phase shifted SCR outlet NOx data regarding a state of the SCR inlet and outlet NOx sensors.
    Type: Application
    Filed: September 19, 2017
    Publication date: January 4, 2018
    Applicant: Cummins, Inc.
    Inventors: Andrew W. Osburn, Christopher Ferguson, Tony James Hall, Brian P. Liimatta
  • NOx sensor diagnostic for an exhaust aftertreatment system
    Patent number: 9784166
    Abstract: A method for diagnosing NOx sensors in an exhaust aftertreatment system includes suspending reductant dosing in an exhaust aftertreatment system; purging a reductant deposit in a selective catalytic reduction (SCR) system of the exhaust aftertreatment system; adjusting at least one of an ignition timing and an engine speed for an engine to adjust an engine out nitrogen oxide (NOx) amount; receiving measured SCR inlet NOx data from a SCR inlet NOx sensor and measured SCR outlet NOx data from a SCR outlet NOx sensor; determining a phase shift between the measured SCR inlet and SCR outlet NOx data; applying the determined phase shift to the SCR outlet NOx data; and determining a diagnostic feature based on the SCR inlet NOx data and the phase shifted SCR outlet NOx data regarding a state of the SCR inlet and outlet NOx sensors.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: October 10, 2017
    Assignee: Cummins Inc.
    Inventors: Andrew W. Osburn, Christopher Ferguson, Tony James Hall, Brian P. Liimatta
  • NOx SENSOR DIAGNOSTIC FOR AN EXHAUST AFTERTREATMENT SYSTEM
    Publication number: 20160186630
    Abstract: A method for diagnosing NOx sensors in an exhaust aftertreatment system includes suspending reductant dosing in an exhaust aftertreatment system; purging a reductant deposit in a selective catalytic reduction (SCR) system of the exhaust aftertreatment system; adjusting at least one of an ignition timing and an engine speed for an engine to adjust an engine out nitrogen oxide (NOx) amount; receiving measured SCR inlet NOx data from a SCR inlet NOx sensor and measured SCR outlet NOx data from a SCR outlet NOx sensor; determining a phase shift between the measured SCR inlet and SCR outlet NOx data; applying the determined phase shift to the SCR outlet NOx data; and determining a diagnostic feature based on the SCR inlet NOx data and the phase shifted SCR outlet NOx data regarding a state of the SCR inlet and outlet NOx sensors.
    Type: Application
    Filed: December 30, 2014
    Publication date: June 30, 2016
    Inventors: Andrew W. Osburn, Christopher Ferguson, Tony James Hall, Brian P. Liimatta
  • Systems, apparatuses, and methods of determining plugging or deplugging of a diesel oxidation catalyst device
    Patent number: 7685814
    Abstract: One embodiment of the present invention includes a unique technique to regulate operation of an internal combustion engine. Other embodiments include unique apparatus, devices, systems, and methods relating to internal combustion engine including exhaust aftertreatment components, apparatus, and systems.
    Type: Grant
    Filed: July 12, 2006
    Date of Patent: March 30, 2010
    Assignee: Cummins Filtration, Inc.
    Inventors: Yuetao Zhang, Daniel D. Wilhelm, Brian P. Liimatta
  • Apparatus, system, and method for estimating ash accumulation
    Patent number: 7506503
    Abstract: An apparatus, system, and method are disclosed for estimating ash accumulation. An interpolation module calculates a first particulate accumulation from an interpolation function. An ash feedback module calculates an ash accumulation as an ash feedback function of the first particulate accumulation and a stored first ash accumulation estimate. In one embodiment, an ash feedforward module calculates an added ash estimate. An ash accumulation module may calculate a second ash accumulation estimate as the sum of the ash accumulation and the added ash estimate. A regeneration module may deep clean the filter if the second ash accumulation estimate exceeds an ash threshold. In one embodiment, a soot calculation module calculates a soot accumulation as a second particulate accumulation minus the second ash accumulation estimate.
    Type: Grant
    Filed: September 15, 2005
    Date of Patent: March 24, 2009
    Assignee: Cummins, Inc
    Inventors: Brian P. Liimatta, Patrick J. Shook, J. Steve Wills, Joan Wills
  • Systems, apparatuses, and methods of determining plugging or deplugging of a diesel oxidation catalyst device
    Publication number: 20080010975
    Abstract: One embodiment of the present invention includes a unique technique to regulate operation of an internal combustion engine. Other embodiments include unique apparatus, devices, systems, and methods relating to internal combustion engine including exhaust aftertreatment components, apparatus, and systems.
    Type: Application
    Filed: July 12, 2006
    Publication date: January 17, 2008
    Inventors: Yuetao Zhang, Daniel D. Wilhelm, Brian P. Liimatta