Detroit Diesel Corporation

Peter Zagone

Mark Allen Zurawski

Matthew Thomas Baird

Min Sun

Jeffery Scott Hawkins

Richard Michael Avery, Jr

Kevin Sisken

Tomislav Ivo Golub

Amr Radwan

Zornitza Pavlinova Pavlova-MacKinnon

Frank S Groer

Brian Andrew Lewallen

Phillip F Rimnac

Harald Wedler

Heather A Staley

Donald E Keski-Hynnila

Reinhard Pfundt

Dennis J Grace

A method for verifying the functionality of the components for a diesel particulate filter system based upon engine speed, engine torque, inlet and outlet exhaust pressure at the diesel particulate filter. Various sensor signals are compared to calibratable values in memory for a determination whether the diesel particulate filter system is functional.

Method for verifying the functionality of the components of a diesel particulate filter system

A method for operating an electronic controlled internal combustion engine with an electronic control unit (ECU) having at least nonvolatile memory and tables resident therein to automatically recalibrate an exhaust gas recirculation (EGR) differential pressure sensor.

EGR differential pressure sensor auto calibration method

A system and method for controlling an internal combustion engine monitor exhaust back pressure and take remedial action when the exhaust back pressure exceeds a corresponding threshold. The system and method respond to increased exhaust back pressures attributable to various causes to alert the vehicle operator and/or engage engine protection mechanisms depending on the back pressure severity level in an effort to avoid engine/component damage. Fault timers are provided for tracking time fault conditions are present and time that faults are active, with active faults being latched for the current ignition cycle. Available engine torque may be reduced in response to excessive exhaust back pressure. Anti-tampering logic is provided to detect attempts to defeat the protection feature.

Engine control based on exhaust back pressure

A system and method for determining EGR flow in a multi-cylinder internal combustion engine include determining specific heat of the exhaust gas based on current engine operating conditions and determining EGR flow rate based on the determined specific heat and a signal provided by a sensor. In one embodiment, a species tracking model is used to determine the amount of various species within the exhaust gas which may include oxygen, nitrogen, carbon dioxide, and water, for example, to determine the current specific heat, which is compared to a reference specific heat for the sensor, the difference being used to adjust the sensor value and determine the EGR mass flow rate. The species tracking model uses a simplified combustion model to estimate the amount of each specie in the exhaust gas based on various engine operating parameters, such as fuel, air/fuel ratio, and turbo boost, for example.

System and method for determination of EGR flow rate

Systems and methods for discriminating between an EGR temperature sensor fault and actual EGR temperatures which produce similar signals includes suppressing high voltage faults for a calibratible period of time after the engine is started. Alternatively, or in addition, a sensor fault is not indicated unless secondary indicators suggest that EGR temperature is sufficiently different from the EGR temperature corresponding to the sensor signal. Secondary indicators may include signals provided by various other engine and/or vehicle sensors such as an ambient air temperature sensor, engine coolant temperature sensor, oil temperature sensor, or the like.

High voltage fault discrimination for EGR temperature sensor

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Huntington Woods, MI, United States of America

Peter Zagone