Method and apparatus for estimating exhaust temperature of an internal combustion engine

Abstract

The invention comprises a method and an article of manufacture to estimate exhaust gas temperature of an internal combustion engine during ongoing operation of the engine. This comprises determining states of a plurality of parameters of a combustion charge. A heat release of the combustion charge is estimated based thereon, and an exhaust gas temperature is estimated based upon the estimated heat release. Exemplary parameters of the combustion charge comprise engine speed, mass air flowrate, engine fueling and fuel injection timing, and, recirculated exhaust gas fraction.

Description

technical field [0001] The present invention relates generally to internal combustion engines, and more particularly to determining the exhaust gas temperature of an internal combustion engine. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0003] Modern internal combustion engines are equipped with sophisticated systems to monitor and control all aspects of engine performance during ongoing operation in order to meet operator demands for performance (including torque and fuel economy) and to comply with emissions, safety and fuel economy related government regulations. Such systems include sensing devices and actuators connected to one or more control modules that execute computer programs to monitor and control engine operation during ongoing operation. [0004] Exhaust gas temperature is an important parameter used by engine system designers. Emissi...

AI Technical Summary

Problems solved by technology

In addition, a system that employs physical sensors to measure exhaust temperature is required to monitor for operational failures of the sensors, further adding to the complexity of the system

[0010] Current algorithmic models for determining and estimating exhaust gas temperature include nonlinear models, which require significant computational resources and impact on-board control module throughput

Furthermore, empirical models of conventional combustion systems are not readily adapted to operate with systems employing premixed charge ignition (PCI) combustion with high EGR flow rates

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