Stefan S Simescu from 8823 Woodland Pkwy, Fair Oaks, TX 78015, age 60, Phone: 2106942408

Passive Nox And Pm Aftertreatment For Diesel Engine
view source
US Patent:

8316633, Nov 27, 2012
Filed:

May 29, 2009
Appl. No.:

12/475099
Inventors:

Magdi K. Khair - San Antonio TX, US
Stefan Simescu - Boerne TX, US
Gary D. Neely - Boerne TX, US
Vlad L. C. Ulmet - San Antonio TX, US
Assignee:

Southwest Research Institute - San Antonio TX
International Classification:

F01N 3/00
US Classification:

60285, 60297, 60299, 60311
Abstract:

A method of reducing emissions by operating a diesel engine in a stoichiometric air-fuel ratio mode. To achieve an optimal stoichiometric mode, intake throttling, boost air intake control, fuel injection adjustments, and exhaust gas recirculation (EGR) are used. This mode of operation permits an aftertreatment system that has only an oxidation catalyst and a particulate filter.

Engine And Method For Controlling Homogenous Charge Compression Ignition Combustion In A Diesel Engine
view source
US Patent:

20020073940, Jun 20, 2002
Filed:

Dec 15, 2000
Appl. No.:

09/738446
Inventors:

Stefan Simescu - San Antonio TX, US
Thomas Ryan - San Antonio TX, US
Daniel Dickey - Helotes TX, US
Assignee:

SOUTHWEST RESEARCH INSTITUTE
International Classification:

F02B047/02
US Classification:

123/02500C
Abstract:

An operating characteristic representative of a first stage reaction in HCCI combustion is sensed and used as a control event for injecting water into the combustion chamber to delay the start of combustion of the primary HCCI reaction.

Diesel Engine Operation For Fast Transient Response And Low Emissions
view source
US Patent:

20130304357, Nov 14, 2013
Filed:

May 14, 2012
Appl. No.:

13/471086
Inventors:

Chad P. Koci - Chillicothe IL, US
Vlad L.C. Ulmet - San Antonio TX, US
Stefan Simescu - Boerne TX, US
Magdi K. Khair - San Antonio TX, US
Gary D. Neely - Boerne TX, US
Assignee:

SOUTHWEST RESEARCH INSTITUTE - San Antonio TX
International Classification:

F02D 41/26
F02B 47/08
F01N 3/035
F02M 25/07
US Classification:

701108
Abstract:

A method for controlling emissions in the exhaust gas of a diesel engine, the engine having an exhaust gas recirculation (EGR) system. The engine's exhaust aftertreatment system need have only an oxidation catalyst and a particulate filter (with no NOx reduction or adsorption device). In “normal” engine conditions, the engine is operated with a lean air-fuel ratio, with “normal” engine conditions being engine conditions other than transient load increase engine conditions. Also, during normal engine conditions, the EGR system is used to reduce engine-out NOx. During transient load increase engine conditions, the engine is operated stoichiometrically or near stoichiometrically and the use of EGR is interrupted.

Stefan S Simescu