Jeffrey A Leet

US Patent:

7197867, Apr 3, 2007

Filed:

Jul 1, 2005

Appl. No.:

11/174404

Inventors:

Yiqun Huang - San Antonio TX, US
Shizuo Sasaki - San Antonio TX, US
Gary D. Neely - San Antonio TX, US
Jeffrey A. Leet - San Antonio TX, US

Assignee:

Southwest Research Institute - San Antonio TX

International Classification:

F01N 3/00

US Classification:

60295, 60274, 60277, 60280, 60285, 60297

Abstract:

High exhaust gas temperatures whereby sulfur is removed from a lean NOx traps simultaneously with regeneration of a Diesel particulate filter is provided by alternating engine operation in respectively defined lean and rich combustion modes. The duration and frequency of the respective lean and rich operating modes, as well as the air/fuel ratio during the respective modes, are preferably controlled by the sensed temperature of the lean NOx trap substrate.

US Patent:

6378489, Apr 30, 2002

Filed:

May 24, 2001

Appl. No.:

09/864983

Inventors:

Rudolf H. Stanglmaier - San Antonio TX 78251
Daniel W. Dickey - Helotes TX 78023
Jeffrey A. Leet - Mico TX 78056
Lee G. Dodge - San Antonio TX 78240
Matthew E. Schulman - Helotes TX 78023

International Classification:

F02M 4300

US Classification:

123304, 123575

Abstract:

At least two separate fuels, having different volatility characteristics, are used to control the combustion phasing in a compression ignition engine. Desirably, the separate fuels are produced by distillation by which a parent fuel is separated into separate fractions having different reactivity. The provision multiple fuels by distillation and the control method embodying the present invention are particularly useful in controlling the combustion phasing of homogenous charge compression ignition combustion processes.