Estimation and Control of Diesel Engine Processes ... · PDF filee im vol d 2 N WV= ρη...

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Transcript of Estimation and Control of Diesel Engine Processes ... · PDF filee im vol d 2 N WV= ρη...

  • Innovation you can depend on

    Technical Advisor Advanced Engineering

    Estimation and Control of Diesel Engine Processes Utilizing Variable Intake Valve Actuation

    Lyle E. Kocher

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    Experimental Test Bed Model Based Approach Gas Exchange Model

    Manifold Filling Dynamics Volumetric Efficiency Oxygen Fraction Dynamics

    Combustion Model

    PCCI Combustion Timing Model Controller Development

    PCCI Combustion Timing Summary

    Presentation Overview

    VGT Position

    EGR Valve Position

    EGR VALVE

    Exhaust

    Intake Manifold

    Exhaust Manifold

    CAC

    IVC Modulation

    Fueling

    EGR Cooler

    FRESH AIR

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    n Experimental Test Bed

    2010 Cummins ISB 360 HP (268 kW) 17.3:1 Compression Ratio Common Rail Fuel Injection Air-Handling System

    Exhaust Gas Recirculation Valve Variable Geometry Turbocharger

    Variable Valve Actuation System Electro-Hydraulic System Cylinder Independent Cycle-to-cycle

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    Gas Exchange Process

    Combustion Process

    Conventional combustion

    Advanced combustion strategies (i.e. PCCI, LTC)

    EGR valve position

    VGT position

    Valve Timing

    Engine speed

    Exhaust gas enthalpy

    mIVC

    [O2]IVC

    ECR

    TIVC

    mixing

    Fuel injection

    Torque

    Emissions

    Fuel consumption Exhaust gas

    enthalpy

    Model Based Approach

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    Physically-based generalizable models Validated experimentally Validated via analysis (math-based stability, convergence rate, and sensitivity/uncertainty analysis)

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    5 Model States Intake Manifold

    Pressure Temperature

    Exhaust Manifold Pressure Temperature

    Turbo Shaft Speed VGT

    Position

    EGR Valve Position

    EGR VALVE

    Exhaust

    EGR Cooler

    Intake Manifold

    Exhaust Manifold

    LFE AIR FILTER FRESH AIR

    CAC

    Intake Valve Modulation

    Fueling Commands

    Gas Exchange Model

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    Intake Manifold State Equations

    Exhaust Manifold State Equations

    Turbocharger Speed State Equation

    ( )im imim egr egr c cac e imim

    Rp W T W T W TV

    = +

    ( ) ( ) ( )im imim egr im egr im c im cac im e im im imim im

    R TT W T T W T T W T TP V

    = + +

    ( )exh exhem e f exh egr em t emem

    Rp W W T W T W TV

    = +

    ( )( ) ( ) ( )em emem e f em exh em egr em em em t em em emem em

    R TT W W T T W T T W T TP V

    = + + +

    m turb comptc

    turb tc

    P PI

    =

    Gas Exchange Model

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    Volumetric Efficiency Model

    Exhaust Enthalpy Model

    Analytical Turbocharger Performance Functions

    ( )1

    1 eae a

    kkf LHVim e

    evo tdck kc im evo e im

    a N b m Qp kECRT Vm R V k P ECR

    + = +

    2e im vol dNW V =

    ( ) ( )( ) ( )

    , ,

    , ,c c turb t t turb

    c c turb t t turb

    W f PR N W f PR N

    f PR N f PR N

    = =

    = =

    Gas Exchange Model

    ( ) ( ) ( )eff ef ivo ivf civcim ivc em ivo em evc ivo im ik

    v v p ivo ivc s

    vol

    vc ivo wall imivc

    im d p

    VP V P V P V V P V V T T

    Vc c

    c

    R

    P

    c R h

    V

    A

    +

    =

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    Volumetric Efficiency Model Results

    5% Lines 2.5% RMS Error

    Gas Exchange Model

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    n Gas Exchange Model

    1850 RPM, 300 ft-lb

    Gas Exchange Model Results

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    imim amb c em egr im e

    im im

    RTF F W F W F WP V

    = +

    ( )emem eo e f em egr em tem em

    RTF F W W F W F WP V

    = +

    Gas Exchange Model

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    Gas Exchange Model

    Oxygen Fraction Estimator Results

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    Start of Combustion Prediction

    Red lines are 2CA

    PCCI Combustion Timing Model

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    What needs to be controlled to control PCCI combustion timing?

    Can we separate dynamics?

    Slower dynamics driven by gas exchange process

    Faster dynamics driven by fuel injection process

    PCCI Combustion Timing Model

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    1600 rpm & 140 ft-lbf Fim Command Step Change

    PCCI Combustion Timing Controller

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    1600 rpm & 140 ft-lbf SOC Command Step Change

    PCCI Combustion Timing Controller

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    Experimental Test Bed Model Based Approach Gas Exchange Model

    Manifold Filling Dynamics Volumetric Efficiency Oxygen Fraction Dynamics

    Combustion Model

    PCCI Combustion Timing Model Controller Development

    PCCI Combustion Timing Summary

    Summary

    VGT Position

    EGR Valve Position

    EGR VALVE

    Exhaust

    Intake Manifold

    Exhaust Manifold

    CAC

    IVC Modulation

    Fueling

    EGR Cooler

    FRESH AIR

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    Estimation and Control of Diesel Engine Processes Utilizing Variable Intake Valve ActuationPresentation OverviewExperimental Test BedModel Based ApproachGas Exchange ModelGas Exchange ModelGas Exchange ModelGas Exchange ModelGas Exchange ModelGas Exchange ModelGas Exchange ModelPCCI Combustion Timing ModelPCCI Combustion Timing ModelPCCI Combustion Timing ControllerPCCI Combustion Timing ControllerSummary