Gm Global Technolgoy Operations, Inc.

Giorgio Nati

Davide Gessaroli

Paolo Olmo

Cristian Taibi

Andrea Dutto

Isadora Ricci

Stefano Pellegrino

Andrea De Filippo

Davide Francesco Mercuri

Nicola Pio Sacco

Adele De Domenico

Cosma Negro

A method and apparatus is provided for regenerating an after-treatment device associated with an exhaust system of an internal combustion engine. A lambda error control provides a lambda error signal based upon a measured lambda value and a predetermined lambda value indicative of rich operation. An after-injection map provides an after-injection preset based upon a speed and a torque of the internal combustion engine. A main injection map provides a torque-making main injection preset based upon the speed of the internal combustion engine and the torque of the internal combustion engine. A controller is configured to provide an after-injection quantity signal based upon the after-injection preset, the lambda error signal and a main injection quantity signal based upon the main injection preset and the lambda error signal such that the measured lambda value is maintained within a regeneration range.

Control apparatus and method for after-treatment system regeneration

A method of operating a fuel injector of an internal combustion engine having a reciprocating piston includes performing a multi after-injection pattern having at least one pair of consecutive injection pulses both starting after a top dead center of the piston and separated by a dwell time shorter than 200 as.

Method of operating a fuel injector of an internal combustion engine of a motor vehicle

A method and apparatus for regenerating a Lean NOx Trap in an internal combustion engine is disclosed. The internal combustion engine includes a Lean NOx Trap, a turbocharger having a turbine. An electronic control unit is configured to execute a regeneration event of the Lean NOx Trap, and regulate a position of an actuator affecting a rotating speed of the turbine using a closed-loop control strategy of an air pressure into an intake duct downstream of a compressor of the turbocharger and upstream of a throttle valve during the execution of the regeneration event.

Method and apparatus for regenerating a lean NOx trap in a turbocharged internal combustion engine

An internal combustion engine includes an aftertreatment device, an injector for injecting fuel into a cylinder and an Electronic Control Unit configured to perform a regeneration process of the aftertreatment device. The regeneration process includes determining a nominal fuel quantity to be injected by an after-injection; monitoring a temperature value of the aftertreatment device; determining a fuel quantity correction value, as a function of a difference between the monitored temperature value and a target temperature value of the aftertreatment device; correcting the nominal fuel quantity value, using the fuel quantity correction value, in order to determine a corrected fuel quantity value; performing a fuel injection cycle including a plurality of after-injections; and injecting the corrected fuel quantity value into the cylinder during one of the after-injections of the cycle.

Internal combustion engine equipped with an aftertreatment device

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Villar Focchiardo, Italy

Giorgio Nati