Wei U Li

US Patent:

6811610, Nov 2, 2004

Filed:

Jun 3, 2002

Appl. No.:

10/161266

Inventors:

Robert H. Frushour - Ann Arbor MI
Wei Li - Ann Arbor MI

Assignee:

Diamond Innovations, Inc. - Worthington OH

International Classification:

C23C 1627

US Classification:

117 88, 4272497, 4272498, 427370, 4273722, 427444, 427902

Abstract:

Single crystal CVD diamond is heated to temperatures of 1500Â C. to 2900Â C. under a pressure that prevents significant graphitization. The result is a CVD diamond with improved optical properties.

US Patent:

RE41189, Apr 6, 2010

Filed:

Jan 30, 2009

Appl. No.:

12/362529

Inventors:

Wei Li - Ann Arbor MI, US
Russell J. Hemley - Washington DC, US
Ho-kwang Mao - Washington DC, US

Assignee:

Carnegie Institution of Washington - Washington DC

International Classification:

C23C 16/27

US Classification:

117 88, 4272497, 4272498, 427370, 4273722, 427444, 427902

Abstract:

Single crystal CVD diamond is heated to temperatures of 1500 C. to 2900 C. under a pressure that prevents significant graphitization. The result is a CVD diamond with improved optical properties.

US Patent:

8001768, Aug 23, 2011

Filed:

Feb 1, 2008

Appl. No.:

12/024638

Inventors:

David J. Cleary - West Bloomfield MI, US
Calvin K. Koch - Huntington Woods MI, US
Wei Li - Troy MI, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

F01N 3/00
F01N 3/10

US Classification:

60285, 60274, 60287, 60288, 60295, 60301

Abstract:

The disclosure sets forth operating a spark-ignition, direct-fuel injection internal combustion engine equipped with an exhaust aftertreatment system including a lean-NOx reduction catalyst upstream of a second converter element. The engine preferentially operates in one of a homogeneous charge combustion mode and a stratified charge combustion mode based upon temperature of the lean-NOx reduction catalyst. Exhaust gas flow is selectively diverted to the second converter element.

US Patent:

8041498, Oct 18, 2011

Filed:

Oct 9, 2008

Appl. No.:

12/248246

Inventors:

David B. Brown - Brighton MI, US
David J. Cleary - Shanghai, CN
Wei Li - Troy MI, US

International Classification:

F02D 41/00
F01N 3/00

US Classification:

701103

Abstract:

A control system comprising an NHstorage level determination module that determines an NHstorage level in an exhaust system, and a fuel control module that controls an air-to-fuel (A/F) ratio in an engine based on the NHstorage level. A method comprising determining an NHstorage level in an exhaust system, and controlling an A/F ratio in an engine based on the NHstorage level.

US Patent:

8041501, Oct 18, 2011

Filed:

Mar 4, 2009

Appl. No.:

12/397798

Inventors:

David B. Brown - Brighton MI, US
Wei Li - Troy MI, US

International Classification:

F02D 41/02
F02D 41/00

US Classification:

701109, 123703

Abstract:

A method and system for monitoring an exhaust gas adsorber includes a comparison module comparing the first exhaust gas constituent signal corresponding to an amount of exhaust gas constituent in an exhaust conduit and a second exhaust gas constituent signal corresponding to an amount of exhaust gas constituent in the exhaust gas adsorber. The system includes a fault module generating a fault in response to comparing in the comparison module.

US Patent:

8448423, May 28, 2013

Filed:

Dec 9, 2008

Appl. No.:

12/330587

Inventors:

Paul M. Najt - Bloomfield Hills MI, US
Kushal Narayanaswamy - Sterling Heights MI, US
Kevin L. Perry - Fraser MI, US
Wei Li - Troy MI, US
David J. Cleary - Shanghai, CN
James Donald Smith - Ann Arbor MI, US

Assignee:

GM Global Technology Operations LLC - Detroit MI

International Classification:

F01N 3/00

US Classification:

60285, 60274, 60311

Abstract:

Operation of a spark ignition, direct injection engine having an aftertreatment system including an oxidation catalyst and a selective catalyst reduction device is described. The method includes controlling to a stoichiometric air/fuel ratio and retarding spark ignition timing. Engine fueling is then controlled to a lean air/fuel ratio and spark is retarded. The engine is then operated to generate ammonia reductant. Engine operation then comprises operating at a preferred air/fuel ratio and controlling spark ignition timing to a preferred timing.

US Patent:

20100186391, Jul 29, 2010

Filed:

Jan 28, 2009

Appl. No.:

12/360908

Inventors:

Paul M. Najt - Bloomfield Hills MI, US
Kushal Narayanaswamy - Sterling Heights MI, US
Kevin L. Perry - Fraser MI, US
David J. Cleary - Shanghai, CN
James Donald Smith - Ann Arbor MI, US
Wei Li - Troy MI, US
Chang H. Kim - Rochester MI, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS, INC. - DETROIT MI

International Classification:

F01N 3/20
F02D 41/30

US Classification:

60295, 60274, 60299, 701103

Abstract:

A method for controlling a powertrain includes selectively initiating an ammonia generation cycle including injecting fuel into a combustion chamber of an engine before a primary combustion event to a calibrated air fuel ratio in a range lean of stoichiometry based upon generation of NOx within the combustion chamber, injecting fuel into the powertrain after the primary combustion event based upon an overall air fuel ratio in a range rich of stoichiometry and resulting generation of molecular hydrogen, utilizing a hydrogen forming catalyst to reform the injected fuel, and utilizing a catalyst device between the engine and the selective catalytic reduction device to produce ammonia.

US Patent:

20110082031, Apr 7, 2011

Filed:

Oct 5, 2009

Appl. No.:

12/573333

Inventors:

David B. Brown - Brighton MI, US
Wei Li - Troy MI, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS, INC. - Detroit MI

International Classification:

B01J 23/10
B01J 23/00
B05D 1/36

US Classification:

502304, 502100, 427402

Abstract:

A catalyst and method of forming the catalyst includes a catalyst body having hydrocarbon adsorber material and oxygen storage capacity material disposed thereon.