Gm Global Technolgoy Operations, Inc.

Other

Alberto Lorenzo Vassallo

Yue-Yun Wang

Hans H Drangel

Suresh Gopalakrishnan

Ibrahim Haskara

Venkata Prasad Atluri

Claudio Ciaravino

Francesco Concetto Pesce

Stefano Pellegrino

Luca Giuseppe Pairolero

Vicente Domenech-Llopis

Fabio Numidi

Richard C Peterson

Federico Luigi Guglielmone

Ramachandra Diwakar

Claudio Cortassa

Andrea Tripodi

Salvatore Sannino

Manuel A Gonzalez Delgado

Paolo Pasero

Michele Dematteis

Denise Risso

A method for controlling the temperature of re-circulated exhaust gas in an internal combustion engine includes operating the internal combustion engine on a base line mode, receiving a signal indicative of an engine operating temperature, wherein the engine operating temperature is one of coolant temperature, exhaust temperature and oil temperature, comparing the engine operating temperature to a predetermined IEGR threshold, when the engine operating temperature is less than the predetermined IEGR threshold, activating an IEGR mode and activating an EEVO mode, and when the engine operating temperature is greater than the first predetermined IEGR threshold, deactivating the IEGR mode and deactivating the EEVO mode.

Exhaust thermal management

A piston for an internal combustion engine includes a piston body having a generally planar crown and a sidewall extending from the crown. A stepped combustion bowl is recessed in the crown and includes an outer bowl recessed relative to the crown and defining a generally planar annular floor surface. The stepped combustion bowl further includes an inner bowl recessed relative to the outer bowl. The inner bowl includes a sidewall that slopes continually inwardly from the outer bowl to a floor surface of the inner bowl. A plurality of protruding lips extend from the sidewall toward a central axis of the piston body.

Radial lip piston profile for easy forgeability

A piston for a diesel engine includes a piston body having a skirt and crown. The piston body has portions defining an outer combustion bowl and an inner combustion bowl within the piston body through the crown. The outer combustion bowl has a curved annular side wall extending from the crown surface and an annular flat shelf extending from the curved annular side wall. The new stepped bowl design integrates a bottom profile with smoothly varying curvature and a sharp step at the top. The annular flat shelf is recessed a distance in the range of 2.5-4.5 millimeters from a line coplanar with the crown surface. The piston body defines an outer convex curved surface connecting the curved annular side wall to the crown surface. The outer convex curved surface has a radius of curvature in the range of 0.25-0.75 millimeter.

Diesel piston with sharp-step profile

A vehicle propulsion system includes an internal combustion engine configured to output a primary output torque and at least one fuel injector arranged to supply fuel to a combustion chamber of the engine. The propulsion system also includes at least one exhaust aftertreatment device to capture combustion byproducts within an exhaust flow. The propulsion system also includes an electric machine coupled to the engine to exchange torque. A controller is programmed to supply a baseline fuel injection corresponding to a first engine output to satisfy a driver torque demand and to periodically supplement the baseline target fuel injection quantity to increase engine output torque to overshoot the first engine output thereby increasing combustion byproducts to regenerate the at least one exhaust aftertreatment device. The controller is also programmed to apply a resistive torque from the electric machine such that an overall propulsion system torque remains at the driver torque demand.

Vehicle exhaust aftertreatment systems and methods

A powertrain system including an internal combustion engine and an electric machine that are configured to generate torque that is transferred via a geartrain to a vehicle driveline is described. A method for controlling the powertrain system includes determining a desired output torque, and determining an engine torque command and an electric machine torque command based upon the desired output torque. An engine-out NOx setpoint associated with operating the engine at the desired output torque is determined. The electric machine is operated in response to the electric machine torque command. The engine is operated to generate torque in response to the engine torque command and engine operation is controlled to achieve the engine-out NOx setpoint.

Method and apparatus for controlling an internal combustion engine

Methods for optimizing exhaust gas system regeneration and cleaning are provided. The exhaust gas system can include an exhaust gas stream supplied by an exhaust gas source to a particulate filter device through an exhaust gas conduit, and a gas sensor having a sampling end disposed within the exhaust gas conduit upstream from the particulate filter device. The methods can include detecting a gas sensor malfunction, detecting particulate filter device soot loading, and performing an optimized maintenance utilizing at least one common technique. A common technique is one which is capable of cleaning a gas sensor and regenerating a PF device. The exhaust gas source can comprise an internal combustion engine and the at least one common technique comprises a post-injection strategy. Systems for performing the disclosed methods are also provided.

Methods for optimizing exhaust gas system regeneration and cleaning

A method of controlling an exhaust gas recirculation system of an internal combustion engine is disclosed. The engine includes a compressor, an intake manifold, an after-treatment system, a low pressure EGR system and a high pressure EGR system. The method temporarily adjusts a low pressure EGR ratio, keeping constant a total EGR rate, after verifying at least one among compressor parameters, after-treatment system parameters or intake manifold parameter.

Method of controlling an exhaust recirculation gas system

An exhaust gas recirculation system for an internal combustion engine comprising an exhaust gas recirculation conduit fluidly connecting an exhaust manifold to an intake manifold of the internal combustion engine, first and second exhaust gas coolers located in series in the exhaust gas recirculation conduit, each of the first and second exhaust gas coolers comprising an inlet and an outlet fluidly connected to a first and a second coolant circuit respectively, wherein the second coolant circuit comprises a radiator having a coolant inlet in fluid communication with the coolant outlet of the second exhaust gas cooler, a pump having a coolant inlet in fluid communication with a coolant outlet of the radiator and a coolant outlet in fluid communication with the coolant inlet of the second exhaust gas cooler, and an additional conduit fluidly connecting the coolant outlet of the exhaust cooler.

Exhaust gas recirculation system for an internal combustion engine

An exhaust gas recirculation cooler for an internal combustion engine is provided. The exhaust gas recirculation cooler includes an external casing with an inlet and an outlet for an exhaust gas flow. A first tube bundle and a second tube bundle, each with an inlet and an outlet for a coolant, are located inside the external casing so that the exhaust gas flow flows through the first tube bundle and the second tube bundle in series. A bypass passage conveys the exhaust gas flow from downstream the first tube bundle to the outlet of the external casing bypassing the second tube bundle. The bypass passage is located inside the external casing between the first tube bundle and the second tube bundle.

Exhaust gas recirculation cooler for an internal combustion engine

A compression-ignition engine is coupled to an exhaust aftertreatment system including a particulate filter. A method of operating the compression-ignition engine includes executing a feed-forward control scheme to determine an amount of post-combustion fuel to achieve a preferred temperature in the exhaust gas feedstream at an inlet to the particulate filter. The amount of post-combustion fuel is a nominal post-combustion fuel amount adjusted for a biodiesel blend ratio of the fuel. The post-combustion fuel is injected upstream of the exhaust aftertreatment system in response to a command to regenerate the particulate filter.

Adaptive regeneration of an exhaust aftertreatment device in response to a biodiesel fuel blend

A method is provided for estimating the relative humidity in an intake line of an internal combustion engine provided with an intake manifold connected to the intake line, an exhaust line, and a Low Pressure EGR (LPE) conduit which fluidly connects the exhaust line to a connecting point of said intake line. The method includes, but is not limited to calculating specific humidity in the exhaust line, as a function of the Oconcentration in said exhaust line; determining ambient specific humidity; calculating specific humidity in a portion of the intake line comprised between said connecting point and said intake manifold, as a function of a flow of external air entering into said intake line, a flow of exhaust gases coming from said Low Pressure EGR (LPE) conduit, the specific humidity in said exhaust line and the ambient specific humidity; calculating the relative humidity in said portion of the intake line, as a function of the specific humidity thereof.

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Turin, Italy

Alberto Lorenzo Vassallo