Gm Global Technolgoy Operations, Inc.

Davide Francesco Mercuri

Stefano Cassani

Igor Zanetti

Roberto Argolini

Simone Barbero

Giorgio Nati

Davide Gessaroli

Paolo Olmo

Marco Petronzi

Pierluigi Rellecati

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 aftertreatment system of an internal combustion engine is disclosed. The aftertreatment system includes in a sequence along the exhaust pipe, a lean NOx trap and a particulate filter. An air/fuel ratio sensor is located upstream of the lean NOx trap and downstream of the turbine outlet to determine the air/fuel ratio during a regeneration process (DeNOx) in the lean NOx trap. A NOx sensor is located downstream of the lean NOx trap or downstream of the particulate filter, to determine NOx in the exhaust pipe. A turbine temperature is determined in accordance with a first means, and a temperature during a desulphation process (DeSOx) in the lean NOx trap is determined in accordance with a second means. At least one of the first and second means for determining a temperature may be a temperature sensor.

Aftertreatment system for internal combustion engines

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 the determination of a NOx concentration value upstream of a Selective Catalytic Reduction (SCR) catalyst in a Diesel engine, the engine having an exhaust line, a Diesel Particulate Filter and a NOx concentration sensor downstream of the SCR catalyst, the method including, but is not limited to estimating the NOx concentration value upstream of the SCR catalyst as a function of at least two engine parameters, measuring the NOx concentration downstream of the SCR catalyst, calculating the difference Z(x, y) between the estimated NOx concentration value and the measured value and, in case the difference is higher than a predetermined threshold, correcting the estimated NOx concentration value with a NOx concentration correction value. The NOx concentration correction value is calculated using a correction map that correlates the at least two engine parameters and the difference Z(x, y) with the NOx concentration correction value.

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Turin, Italy

Davide Francesco Mercuri