Gm Global Technolgoy Operations, Inc.

David A Singer

Frank Ament

David Brian Brown

Alan F Chiesa

John A Zahorchak

Mehrnam Sharif-Bakhtiar

Melvin D Kipp

Fayetta L Colden

An exhaust flow control valve operable over high temperature ranges, comprising: a cylindrical flow housing having a cylinder axis and defining a flow passage; a valve plate pivotably mounted within the cylindrical flow housing, wherein the valve plate has a first facing surface, a second facing surface and a perimeter surface and wherein the valve plate has a pivot axis perpendicular to cylinder axis; a first seat extending radially inward from a first approximate 180 degree portion of an inner perimeter of the cylindrical flow housing, wherein the first seat forms a first partial annular surface having a substantially constant width in a radial direction over an entire arcuate length of the first seat and wherein the first seat faces a first direction parallel to the cylinder axis; a second seat extending radially inward from a second approximate 180 degree portion of the inner perimeter of the cylindrical flow housing, wherein the second seat forms a second partial annular surface having a substantially constant width in a radial direction over an entire arcuate length of the second seat, wherein the second seat faces in a second direction opposite the first direction, wherein the first seat is on one side of the pivot axis and the second seat is on another side of the pivot axis opposite the one side, wherein the valve plate has a dosed position at which the first facing surface seats against the first seat and the second facing surface seats against the second seat.

Exhaust flow control valve

An exhaust system for an internal combustion engine having a primary catalytic converter located downstream of the engine and a hydrocarbon adsorber located downstream of the primary converter. The adsorber comprises a ceramic wall-flow substrate having a zeolite coating, having the ability to selectively adsorb hydrocarbon molecules from exhaust gas, applied to the interior surfaces of the inlet passages of the substrate and a catalytic coating applied to the adjacent surfaces of the walls of the outlet passages of the substrate. The catalyst preferably has a light-off temperature below the desorption temperature of the zeolite. In operation, hydrocarbon is adsorbed by the zeolite following a cold engine start and is held until the zeolite reaches its desorption temperature at which time the hydrocarbon is released and passes through the porous walled substrate for conversion by the catalyst.

Zeolite/catalyst wall-flow monolith adsorber

When a preheater elevates internal combustion engine exhaust gas treatment means temperature above a threshold temperature and prior to and during engine cranking, supplemental air is provided to an internal combustion engine exhaust gas path at a controlled rate responsive to parameters indicating excess engine emission levels during an engine startup period.

Air injection control for preheated catalysts

An air/fuel ratio controller for an internal combustion engine including a memory having numbers stored at locations addressed by engine operating points with the locations addressed by the engine operating points being updated during closed loop operation in accord with the value of a closed loop adjustment of the air/fuel ratio. Each memory location in the memory is updated during operation of the engine at the corresponding operating point in accord with an update time constant having a value so that the number stored tracks adjustment value producing the predetermined desired closed loop air/fuel ratio during varying values of engine temperature. The update time constant is varied directly with the value of engine temperature so that the rate of adjustment of the numbers in the memory is greater during engine warmup where engine temperature increases rapidly. The memory is used during closed loop operation to preset the closed loop adjustment at least when the engine first operates at an operating point.

Growing community of inventors

Farmington, MI, United States of America

David A Singer