Gm Global Technolgoy Operations, Inc.

Jose L DeLeon

Richard B Jess

Chuan He

Jamison C Schroeder

Jay Tolsma

Paul W Kelley

Jeffrey Johnson

Thomas L Bahensky

Scott John Fletcher

GuoJun Shi

Kouji Sakumoto

James S Baumgartner

Mark L DeJong

Brent M Chamberlain

An engine system and method for operating an internal combustion engine includes a turbocharger that generates a boost to the engine. A coolant temperature of the engine is determined along with other based engine inputs and calculated values. A normal boost based on operating conditions of the engine is determined. A supplemental boost is determined based on the coolant temperature. An offset boost based on the normal boost and the supplemental boost is determined. An air output of the turbocharger is modified based on the offset boost. The supplemental boost increases combustion efficiency, which reduces white smoke exhaust.

Control system to minimize white smoke using variable nozzle turbo

A temperature sensor rationality control system for an exhaust treatment system having an oxidation catalyst includes an oxidation catalyst inlet temperature sensor that generates an inlet temperature signal and an oxidation catalyst outlet temperature sensor that generates an outlet temperature signal. A control module determines whether a difference based on the inlet temperature signal and the outlet temperature signal is below a difference threshold when an exhaust temperature is within a threshold range.

Diesel oxidation catalyst (DOC) temperature sensor rationality diagnostic

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Madison Heights, MI, United States of America

Jose L DeLeon