Christopher J Sharp

US Patent:

8001769, Aug 23, 2011

Filed:

Aug 20, 2007

Appl. No.:

11/892132

Inventors:

Zhiyong Wei - Chicago IL, US
Theodore M. Kostek - San Antonio TX, US
Christopher Alan Sharp - San Antonio TX, US

Assignee:

Caterpillar Inc. - Peoria IL

International Classification:

F01N 3/00

US Classification:

60286, 60274, 60284, 60295, 60301, 60285

Abstract:

An emissions control system is disclosed. The emissions control system may have a power source that creates a flow of exhaust and a filtering device that receives the flow of exhaust. A first sensor may be located at or upstream of the filtering device, the first sensor being configured to measure a first temperature, and an SCR catalyst may be located downstream of the filtering device. The emissions control system may also have an injector configured to inject a reduction agent into the flow of exhaust in the presence of the SCR catalyst. The emissions control system may further have a controller in communication with the first sensor. The controller may be configured to predict a change in an ability of the SCR catalyst to store reduction agent using a measured change in the first temperature and adjust the injector according to the predicted change in the storage ability of the SCR catalyst.

US Patent:

7992380, Aug 9, 2011

Filed:

Aug 22, 2008

Appl. No.:

12/196332

Inventors:

Zhiyong Wei - Chicago IL, US
Christopher Alan Sharp - San Antonio TX, US

Assignee:

Caterpillar Inc. - Peoria IL

International Classification:

F01N 3/00
F01N 3/10

US Classification:

60286, 60295, 60299, 60301, 60303

Abstract:

An emissions control system is disclosed. The emissions control system may have a power source that creates a flow of exhaust, an SCR catalyst situated to receive the flow of exhaust, and an injector configured to inject a reduction agent into the flow of exhaust in the presence of the SCR catalyst. The emissions control system may further have a controller configured to calculate a spatially dependent surface coverage of the reduction agent on the SCR catalyst and substantially stop injection of the reduction agent when the spatially dependent surface coverage of the reduction agent exceeds a maximum surface coverage of the reduction agent at one or more spatial locations.