Gm Global Technolgoy Operations, Inc.

Gregory F O'Daniel

David S Mathews

Tameem K Assaf

Ellen S Schwartz

Douglas J Moening

Changsoo Kim

Steven E Ives

Dennis M Provenzano

A combustion engine is configured to substantially reduced pressure in the crankcase relative to atmospheric conditions. Under the conditions of reduced pressure, removal of contaminants present in the lubricating oil present is effected, which may provide one or more benefits including extended service intervals, reduced volumes of motor oils used, and lessened wear of internal engine components.

High vacuum crankcase ventilation

A cylinder misfire control system for a displacement on demand (DOD) engine that is operable in an activated mode and a deactivated mode includes a sensor that is responsive to rotation of a crankshaft of the engine and a first module that calculates a time derivative based on a first time period associated with a first deactivated cylinder and a second time period associated with a second deactivated cylinder. The first and second time periods are based on the rotation of the crankshaft. A second module detects a misfire occurrence in an activated cylinder based on the time period derivative.

Misfire detection system for displacement on demand (DOD) engine

A diagnostic for diagnosing fault conditions including leak and restriction conditions in a positive crankcase ventilation (PCV) system of an internal combustion engine in which temperature of intake air passed to the PCV system and temperature of exhaust gas exhausted from the PCV system are monitored under test conditions and a temperature change across the PCV system generated therefrom for comparison to an expected temperature change reference as a function of current engine operating conditions. A significant persistent deviation of the temperature change away from the expected temperature change is indicated as a fault condition of the PCV system.

Positive crankcase ventilation system diagnostic

A torque converter has an end cover or input shell which is stamped from a sheet metal plate and has a stiffening fluid portion and an outer flow formed annular rim. The impeller, turbine and stator are assembled along with a torque converter clutch after which the rim portion of the end cover is welded to the impeller. The impeller and the cover have a flange or radially extending portion that is selectively trimmed to control the dynamic balance of the assembly. The turbine member is cast with the outer core and blade portions integral and an inner core member is welded thereto. This is completed prior to assembly within the torque converter.

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Davisburg, MI, United States of America

Gregory F O'Daniel