Joseph A Mcdonald

US Patent:

6779339, Aug 24, 2004

Filed:

May 2, 2003

Appl. No.:

10/428153

Inventors:

Christopher A. Laroo - Canton MI
Charles R. Schenk - Ypsilanti MI
Joseph F. McDonald - Ann Arbor MI
Byron J. Bunker - Ann Arbor MI
Brian A. Olson - Jackson MI
Robert E. Moss - Belleville MI
Daniel C. Stokes - Ann Arbor MI
Paul Anthony Way - Canton MI

Assignee:

The United States of America as represented by the Environmental Protection Agency - Washington DC

International Classification:

F01N 300

US Classification:

60297, 60274, 60286, 60287, 60291, 60292, 60295, 60303

Abstract:

The method of treating a fuel lean exhaust containing NO and SO includes splitting the exhaust into major and minor portions for flow through multiple flow paths each of which contains a particulate trap and an absorber containing a NO oxidation catalyst and a nitrate absorbent. The major portion is passed through a flow path in the lean state at a first temperature to convert the NO to nitrate and the SO to sulfate. After the first period of operation flows are switched so that one flow path receives a minor exhaust portion for a second period of time during which fuel is injected into that flow path along with diversion of a portion of exhaust from another flow path through a bypass. When during the second period of operation the particulate trap reaches a predetermined temperature, the flow path is opened to an increased exhaust flow to transfer heat from the particulate trap to the NO absorber to bring the NO absorber to a temperature suitable for sulfation, at which time fuel and a small portion of exhaust gas are again introduced in order to effect the desulfation.

US Patent:

6962090, Nov 8, 2005

Filed:

Feb 28, 2002

Appl. No.:

10/085421

Inventors:

Joseph Fitzgerald McDonald - Ann Arbor MI, US
William Martin Silvis - Ann Arbor MI, US
Norbert Kreft - Ann Arbor MI, US
Gerald Marek - Ann Arbor MI, US

Assignee:

AVL North America Inc. - Plymouth MI

International Classification:

G01F015/02
G01N001/22

US Classification:

7386303, 7386473, 73 2331

Abstract:

An exhaust gas measurement system is provided that includes a probe to find a sample exhaust gas passageway for collecting exhaust gas. A stainless steel canister is fluidly connected to the probe for storing the exhaust gas. A pump fluidly interconnects the probe and the canister for transferring the exhaust gas from the probe to the canister. A pressure mass flow controller fluidly interconnects the probe and the canister and produces an exhaust gas flow measurement corresponding to the flow of the exhaust gas from the probe to the canister. A temperature sensor senses a temperature of the exhaust gas proximate to the pressure mass flow controller. The temperature sensor corrects the exhaust gas flow measurement based upon the temperature sensed. A pressure sensor senses a pressure of the exhaust gas proximate to the pressure mass flow controller. The temperature sensor corrects the exhaust gas flow measurement based upon the pressure sensed.

US Patent:

20130276552, Oct 24, 2013

Filed:

Apr 20, 2012

Appl. No.:

13/451587

Inventors:

Lawrence James SANCHEZ - Ann Arbor MI, US
Joseph McDonald - Ann Arbor MI, US
Charles Schenk - Dexter MI, US

Assignee:

The USA as represented by the Administrator of the United States Environmental Protection Agency - Washington DC

International Classification:

G01N 1/24

US Classification:

7386303

Abstract:

Components of interest are captured on a resin column from a sample of exhaust gas from an operating vehicle. Makeup air is added to the residual exhaust gas flow exiting the resin column at a junction downstream of the resin column. Makeup air flow rate is determined using a laminar flow element and pressure and temperature gauges associated therewith. The sample and the makeup air are drawn together through a blower and the flow rate through the blower is calculated based on differential pressure across the blower and temperature of the gas drawn through the blower. The controller adjusts a proportional control valve in the makeup air line to regulate the sample flow rate, taken as the blower flow rate minus the makeup air flow rate, at a predetermined proportion of the exhaust gas flow rate.