Cho Ying Liang, Age 802614 Portsmouth Creek Ave, Henderson, NV 89052

6363771, Apr 2, 2002

Nov 24, 1999

09/444927

Cho Y. Liang - Peoria IL
Steven R. McCoy - Washington IL

Caterpillar Inc. - Peoria IL

G01M 1500

73 2331, 731181, 731173, 60277, 340439

An emissions diagnostic system is used with a compression ignition engine having an exhaust gas stream directed into an SCR catalyst capable of reducing NO in the exhaust gas stream. The system comprises a tank for storing a solution of urea, a pump in fluid communication with the tank for drawing the solution of urea from the tank, a valve in fluid communication with the pump and the exhaust gas stream for receiving the solution of urea from the pump, an air pump connected to the valve for providing air into the valve for mixing with the solution of urea, the valve for spraying the solution of urea into the exhaust gas stream, a sensor for sensing the level of NO emissions emitted by the SCR catalyst, and a control module connected to the sensor for determining whether the level of NO emissions is at an acceptable level.

6422220, Jul 23, 2002

Dec 18, 2000

09/739495

Noel R. Lepp - Peoria IL
Cho Y. Liang - West Lafayette IN
Steven R. McCoy - Washington IL

Caterpillar Inc. - Peoria IL

F02M 2507

12356812, 12356818

An internal combustion engine system, particularly suitable for a motor vehicle, is provided with an intake manifold, an exhaust manifold and an exhaust gas recirculation rate control system fluidly connected to the exhaust manifold and to the intake manifold. The exhaust gas recirculation rate control system includes at least two critical-flow nozzles, each critical-flow nozzle having an intake end and output end, the intake ends being fluidly coupled to the exhaust manifold; at least one valve, each valve being fluidly coupled with at least one output end; and a control module operatively connected to each valve for controlling exhaust gas flow therethrough. Some advantages of such a system is that the exhaust gas recirculation is accurately provided with an âopen-loopâ control system, thereby avoiding the use of a feedback system; the flow can be accurately determined under a choked-flow operating conditions; and the system can readily handle different exhaust gas flow rates.

6691687, Feb 17, 2004

Dec 19, 2002

10/325094

Cho Y. Liang - West Lafayette IN
Steven R. McCoy - Washington IL

Caterpillar Inc - Peoria IL

F02M 2502

123572, 123 4186, 123573

A method and apparatus for the treatment of blow-by gas from a crankcase of an internal combustion engine. A particle and droplet filter removes at least some of any particles or droplets in the gaseous stream. The filtered gaseous stream is passed through a primary heat exchanger, and a catalyzed soot filter downstream of the primary heat exchanger. A secondary heat exchanger may be used to heat the gaseous stream with exhaust gas from the internal combustion engine. Blow-by gases are cleaned for subsequent discharge to the ambient environment, or for reintroduction to the fuel system of the engine.

6871490, Mar 29, 2005

Dec 19, 2002

10/325613

Cho Y. Liang - West Lafayette IN, US
Steven R. McCoy - Washington IL, US

Caterpillar Inc - Peoria IL

F02N003/00

60286, 60278, 60288, 60301, 60287

An emissions control system is used with a compression ignition engine capable of producing an exhaust gas stream to be treated by a reduction agent which is mixed with the exhaust gas stream to convert the exhaust gas stream prior to being directed into an SCR catalyst capable of reducing NOx in the exhaust gas stream. An exhaust gas recirculation valve is associated with the compression ignition engine for directing the exhaust gas stream back into the compression ignition engine. An electronic control unit and sensors determine whether the temperature of the exhaust gas stream is at a predetermined temperature, and if so control operation of the valve to allow a portion of the exhaust gas stream to be directed into the SCR catalyst. A bypass valve may also be provided to prevent the exhaust gas stream from entering into the SCR catalyst.

6882929, Apr 19, 2005

May 15, 2002

10/144721

Cho Y. Liang - Lafayette IN, US
Evan E. Jacobson - Peoria IL, US

Caterpillar Inc - Peoria IL

G06G007/70

701115, 701104, 701114, 701105, 701101, 701102, 701108, 60276, 60277, 60286, 60284, 123295, 123382, 123389, 123463

A method and system may be provided to perform a process for controlling NOemissions of an target engine. In one embodiment of the invention, the process may include determining predicted NOvalues based on a model reflecting a predetermined relationship between control parameters and NOemissions, wherein the control parameters include ambient humidity, manifold pressure, manifold temperature, fuel rate, and engine speed associated with the engine. Further, the process may include adjusting the model based on a determination of whether the predicted NOvalues meet a predetermined criteria associated with actual NOvalues. The adjusted model may be stored in a memory associated with the engine whereby NOemissions exhausted from the engine may be reduced based on virtual NOemission values determined from the adjusted model.

6893487, May 17, 2005

Dec 23, 2002

10/329313

Matthew J. Alger - Columbus OH, US
Cho Y. Liang - West Lafayette IN, US
Edward J. Woods - Germantown Hills IL, US

Caterpillar Inc - Peoria IL

B01D046/00

95273, 553851, 55490, 55523, 55DIG 30, 96380, 60273, 60311

A power generation system has a power source and an aftertreatment system connected to the power source. The aftertreatment system is adapted to treat an exhaust of the power source. The aftertreatment system has a particulate filter that is dimensioned to be interchangeable with a muffler.

7107764, Sep 19, 2006

Jun 15, 2005

11/152069

Cornelius N. Opris - Peoria IL, US
John P. Timmons - Chillicothe IL, US
Mari Lou Balmer-Millar - Chillicothe IL, US
Cho Y. Liang - Henderson NV, US
Anil Raina - Chillicothe IL, US

Caterpillar Inc. - Peoria IL

F01N 3/00

60297, 60274, 60278, 60280, 60286, 60303, 60311

An exhaust treatment system of a power source includes a filter having a housing with an inlet and an outlet, and a regeneration device disposed outside of the housing of the filter. The regeneration device is fluidly connected to the inlet of the housing. The exhaust treatment system also includes an exhaust line configured to assist in directing a portion of a filtered flow of exhaust from the filter outlet to the power source.

7221061, May 22, 2007

Dec 2, 2002

10/307882

Matthew J. Alger - Columbus OH, US
Cho Y. Liang - West Lafayette IN, US
Edward J. Woods - Germantown Hills IL, US

Caterpillar Inc - Peoria IL

F02B 63/04
H02K 7/18
F06K 15/00
F02C 6/00
F02C 6/18

290 1R, 290 1 A, 290 2

A power generation system includes a power module and an external process module. The external process module may include at least one engine support element. The power module has at least one connection zone, and the external process module has at least one connection zone that is configured to align with the at least one connection zone of the power module. The aligned connection zones of the power module and the external process module permit relatively quick and inexpensive attachment of the external process module to the power module. The at least one engine support element may be an aftertreatment element.