Gm Global Technolgoy Operations, Inc.

Simone Barbero

Stefano Cassani

Michele Bilancia

Luca Scavone

Igor Zanetti

Francesco Castorina

Francesco Cianflone

Nando Vennettilli

Alessandro Catanese

Davide Francesco Mercuri

Andrei Gheorghi Kanev

Simone Bambagioni

Salvatore Mafrici

Andrea Di Giovanni

Andrea De Vito

Pierluigi Rellecati

Timo Fink

Manuel Tugnolo

Andreas Gunnarsson

Ronnie Magnusson

A method of operating a cooling circuit of an internal combustion engine is disclosed. The engine is equipped with an engine head, and the cooling circuit includes a pump configured to deliver a variable flow of coolant through the cooling circuit. A coolant flow rate to be delivered by the pump is calculated as a function of an engine load, an engine speed and a desired engine head temperature, and the pump is operated to deliver the calculated coolant flow rate.

Method of controlling a cooling circuit of an internal combustion engine

A system and method can control exhaust braking in a vehicle. The vehicle includes an engine system. The engine system includes internal combustion engine, an intake manifold, a control module, an exhaust system, and a variable geometry turbocharger (VGT) having a turbine. The turbine includes turbine blades and vanes movable with respect to the turbine blades. The method includes the following: (a) receiving an exhaust brake torque request; (b) determining target pumping losses in the internal combustion engine based on the exhaust brake torque request; (c) determining a target exhaust gas pressure within the exhaust system based on the target pumping losses; and (d) determining a target vane position of the vanes based on the target exhaust gas pressure, wherein the target vane position yields an exhaust brake torque in accordance with the exhaust brake torque request.

System and method for controlling exhaust braking in a vehicle

A method is provided for regenerating a diesel particulate filter within a diesel engine system that includes, but is not limited to at least a combustion chamber defined by a reciprocating piston inside a cylinder, at least an exhaust valve for cyclically open the combustion chamber towards an exhaust line, and the diesel particulate filter located in the exhaust line, wherein the method comprises injecting an amount of fuel into the combustion chamber by means of least two consecutive after-injection pulses (AIP-AIP), each of which starts (SOI) after the piston has passed the top dead center (TDC), and sufficiently near to the latter for the fuel to burn at least partially inside the combustion chamber.

Method for regenerating a diesel particulate filter

A method is provided for reducing emissions behind a catalytic converter in an exhaust gas stream of the engine. The method includes, but is not limited to controlling a power supply to a glowplug of a compression-ignition engine. The glowplug is activated if a set of at least two input values remains in a first characteristic region of an input parameter space for at least a predetermined activation time. The first characteristic region consists of one ore more contiguous regions of the input parameter space.

Glowplug temperature control method and device for the reduction of emissions from a diesel engine

A method and a control system are provided for estimating oxygen concentration downstream a diesel oxidation catalyst within a diesel engine system. The method includes, but is not limited to at least an intake manifold, a combustion chamber, an exhaust manifold, and the diesel oxidation catalyst located in the exhaust line upstream a diesel particulate filter, the method comprising: determining unburned fuel mass flow ejected from the combustion chamber, determining air mass fraction in the exhaust manifold, estimating air mass fraction downstream the diesel oxidation catalyst as a function of said unburned fuel mass flow and said air mass fraction in the exhaust manifold, estimating oxygen concentration downstream the diesel oxidation catalyst as a function of the estimated air mass fraction downstream the diesel oxidation catalyst.

Method for estimating oxygen concentration downstream a diesel oxidation catalyst

A method is provided for determining an in-cylinder pressure curve representative of the evolution of the pressure within a cylinder of a multi-cylinder internal combustion engine. The method includes, but is not limited to setting a timeframe during the engine functioning, sampling pressure within at least two sensed cylinders of the engine, the samplings being performed during not contemporary sampling periods within the assumed timeframe, in order to acquire a partial in-cylinder pressure curve for each of the sensed cylinders, and using the partial in-cylinder pressure curves for reconstructing a whole in-cylinder pressure curve.

Method for determining an in-cylinder pressure curve of a multi-cylinder engine

A control method is provided for a fluid control device, particularly for an internal combustion engine, equipped with a position sensor having a nominal characteristic curve representative of a predetermined relationship between an admissible range of position values and a corresponding range of return electric signal values. The method includes, but is not limited to determining an offset (offset; offset) between a returned signal related to at least one defined position of the device and an expected signal related to the defined position of the device according to the nominal characteristic curve, estimating an updated characteristic curve of the sensor by applying the offset (offset; offset) to the nominal characteristic curve, and applying a predetermined control strategy of the fluid control device according to the updated characteristic curve.

Control method and system for a fluid control device, based on position sensor learning

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Turin, Italy

Simone Barbero