Combustion diagnostic for active engine feedback control

Daw, Charles Stuart; Wagner, Robert Milton

Title: Combustion diagnostic for active engine feedback control

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Abstract

This invention detects the crank angle location where combustion switches from premixed to diffusion, referred to as the transition index, and uses that location to define integration limits that measure the portions of heat released during the combustion process that occur during the premixed and diffusion phases. Those integrated premixed and diffusion values are used to develop a metric referred to as the combustion index. The combustion index is defined as the integrated diffusion contribution divided by the integrated premixed contribution. As the EGR rate is increased enough to enter the low temperature combustion regime, PM emissions decrease because more of the combustion process is occurring over the premixed portion of the heat release rate profile and the diffusion portion has been significantly reduced. This information is used to detect when the engine is or is not operating in a low temperature combustion mode and provides that feedback to an engine control algorithm.

Inventors:

Green, Jr., Johney Boyd ^[1]; Daw, Charles Stuart ^[2]; Wagner, Robert Milton ^[2]

(Knoxville, TN)
Knoxville, TN

Issue Date:: 2007-10-02

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 917188

Patent Number(s):: 7277790

Application Number:: 11/380,019

Assignee:: UT-Battelle, LLC (Oak Ridge, TN)

Patent Classifications (CPCs):: F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02D - CONTROLLING COMBUSTION ENGINES

F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02B - INTERNAL-COMBUSTION PISTON ENGINES

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F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02D - CONTROLLING COMBUSTION ENGINES
F02D35/023 - {by determining the cylinder pressure}

F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02B - INTERNAL-COMBUSTION PISTON ENGINES
F02B77/085 - {with sensors measuring combustion processes, e.g. knocking, pressure, ionization, combustion flame}

F - MECHANICAL ENGINEERING F02 - COMBUSTION ENGINES F02D - CONTROLLING COMBUSTION ENGINES
F02D2041/0017 - {by simultaneous control of throttle and exhaust gas recirculation}
F02D35/025 - {by determining temperatures inside the cylinder, e.g. combustion temperatures}
F02D41/401 - {Controlling injection timing
F02D35/028 - {by determining the combustion timing or phasing}
F02D41/3035 - {a mode being the premixed charge compression-ignition mode}
F02D41/0057 - {Specific combustion modes

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02T - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
Y02T10/40 - Engine management systems

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DOE Contract Number:: AC05-00OR22725

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: 42 ENGINEERING

Citation Formats


                    Green, Jr., Johney Boyd, Daw, Charles Stuart, and Wagner, Robert Milton. Combustion diagnostic for active engine feedback control.  United States: N. p., 2007. 
        Web.

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                    Green, Jr., Johney Boyd, Daw, Charles Stuart, & Wagner, Robert Milton. Combustion diagnostic for active engine feedback control.  United States.

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                    Green, Jr., Johney Boyd, Daw, Charles Stuart, and Wagner, Robert Milton. Tue .  
        "Combustion diagnostic for active engine feedback control".  United States.  https://www.osti.gov/servlets/purl/917188.

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@article{osti_917188,

  title        = {Combustion diagnostic for active engine feedback control},

  author       = {Green, Jr., Johney Boyd and Daw, Charles Stuart and Wagner, Robert Milton},

  abstractNote = {This invention detects the crank angle location where combustion switches from premixed to diffusion, referred to as the transition index, and uses that location to define integration limits that measure the portions of heat released during the combustion process that occur during the premixed and diffusion phases. Those integrated premixed and diffusion values are used to develop a metric referred to as the combustion index. The combustion index is defined as the integrated diffusion contribution divided by the integrated premixed contribution. As the EGR rate is increased enough to enter the low temperature combustion regime, PM emissions decrease because more of the combustion process is occurring over the premixed portion of the heat release rate profile and the diffusion portion has been significantly reduced. This information is used to detect when the engine is or is not operating in a low temperature combustion mode and provides that feedback to an engine control algorithm.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2007},

  month        = {10}

}

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