Martin W Hall, Age 503326 W Alsace Ct, Thiensville, WI 53092

7028463, Apr 18, 2006

Sep 14, 2004

10/940523

Bryant G. Hammond - West Bloomfield MI, US
David A. Frank - Rochester Hills MI, US
Martin L. Hall - Rochester Hills MI, US

General Motors Corporation - Detroit MI

F02M 25/07
F01N 3/10

60278, 60304, 12356811

A valve assembly defines a chamber and three ports. A first valve selectively obstructs a first port to prevent fluid communication between a secondary air injection pump and the chamber. A second valve selectively obstructs a second port to prevent fluid communication between an air intake manifold and the chamber. A third port provides fluid communication between the chamber and an exhaust manifold. The chamber thus serves as a common passageway for secondary air flowing from the pump to the exhaust manifold and for exhaust gas flowing from the exhaust manifold to the air intake manifold. In a preferred embodiment, the first and second valves are rigidly interconnected.

8136347, Mar 20, 2012

Sep 5, 2008

12/205313

Ian J. Mac Ewen - White Lake MI, US
Martin L. Hall - Rochester Hills MI, US
Lawrence O Murray - White Lake MI, US
Julia C. Grow - Whitmore Lake MI, US
Richard A. Van Camp - Brighton MI, US
David Edward Prout - Linden MI, US
Igor Anilovich - Walled Lake MI, US

F01N 3/00

60289, 60274, 60285, 60287, 60290, 60292

A control module and method for an exhaust system of an engine can include a secondary air intake (SAI) pressure module that monitors SAI pressure. An accumulation module can accumulate an SAI string length based on the monitored SAI pressure. A calculation module can determine an average SAI string length based on the accumulated SAI string length. A determination module can determine an operating characteristic of the vehicle exhaust based on the average SAI string length.