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Transcript of Engine Optimization.
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7/31/2019 Engine Optimization.
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Engine Optimization Methodologies:Engine Optimization Methodologies:
Tools and Strategies forTools and Strategies forDiesel Engine DesignDiesel Engine Design
George Delagrammatikas
Dennis Assanis, Zoran Filipi, Panos Papalambros,Nestor Michelena
The University of Michigan
May 24, 2000
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
BACKGROUND:
VEHICLE AND ENGINEFUNDAMENTALS
ENGINE
TUNING
INVERSE
DESIGN
TARGET
CASCADING
CVT,
INJECTIONTIMINGS
MAP
SHAPINGAND
MATCHING
ENGINE FLEXIBILITY:
COMPRESSION RATIO,CVT,HYBRID
NOVELTECHNOLOGIES
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
MotivationMotivation
Federal Regulations
Fuel economy (CAFE)
Emissions (NOx, smog, and other pollutants)
Public Awareness
Green movement
Global warming scare
Decrease Dependence on Foreign Oil Avoid another oil crisis
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
ObjectivesObjectives Develop an engine optimization framework
21st century conventional and hybrid heavy truck
Implement techniques to conventional vehicle
Define a problem analytically
Apply suitable driving cycle(s)
Investigate location of use on engine map
Extend lessons learned to hybrid vehicle
How different are demands on engine andtransmission?
Need for a systems approach
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Euro III Steady State Test ProcedureEuro III Steady State Test Procedure
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Power Demands on EnginePower Demands on Engine
Torque,
Speedat Wheel
Torque,
Speedat EngineWHEEL ENGINE
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
HEV System Simulation FrameworkHEV System Simulation Framework
ADVISOR
Matlab-SIMULINK environment
Parallel HEV
ENGINE FUEL DELIVERY
LOOK-UP TABLE
RPMTORQUE
FUEL (g/s)
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Baseline Vehicle ParametersBaseline Vehicle Parameters
Cummins M11-330 (246 kW) Diesel Engine
Wheel/axle assembly for heavy truck
Kenworth T400 Vehicle
Standard heavy vehicle accessory loads
Standard catalyst for CI engine
Eaton Fuller RTLO-12610B 10-Speed Transmission
Generic 10-spd constant efficiency gearbox
Heavy Vehicle Powertrain Control
Eaton Fuller RTLO-12610B 10-Speed Transmission
Generic 10-spd constant efficiency gearbox
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Baseline Cummins Engine MapBaseline Cummins Engine Map
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Driving Cycles InvestigatedDriving Cycles InvestigatedUS06 REP05
FHDSFUDS
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Engine Use Points for Various CyclesEngine Use Points for Various CyclesUS06 REP05
FHDSFUDS
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Power Frequency for Each CyclePower Frequency for Each CycleUS06 REP05
FHDSFUDS
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Out
putTorqu
e
Out
putTorqu
e
Engine SpeedEngine Speed
Ideal BSFC Line GenerationIdeal BSFC Line Generation
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Determine cumulative fuel throughput foreach cycle investigated
Interpolate BSFC from engine map for everytorque/speed combination for that given cycle
Integrate all BSFCs from above step
Find the total time that engine is producing power
Mean effective BSFC = total BSFC/engine on time
Benefits of Flexible Engine DesignsBenefits of Flexible Engine DesignsActual Transmission CaseActual Transmission Case
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Ideal BSFCIdeal BSFC vsvs. Power Level. Power Level
PowerPower
BSFC(g/k
W-hr)
BSFC(g/k
W-hr)
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Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Benefits of Flexible Engine DesignsBenefits of Flexible Engine DesignsIdeal Transmission CaseIdeal Transmission Case
Find ideal BSFC transmission line on enginemap used for a given cycle
Interpolate BSFC for every visited power level onthe BSFC vs. Power graph
Sum of all BSFCs is cumulative fuel throughput
Mean effective BSFC = numerical average of totalfuel throughput during time steps when engine is
active
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Potential Benefits of Ideal CVT DesignPotential Benefits of Ideal CVT Design
0
20
40
60
80
100
120
140
US06 REP05 FUDS FHDS
4*BSFCmin
2*BSFCmin
Increase
inMeanBSFCPerCycle
IncreaseinMeanBSFCPerCy
cle
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Optimum Injection Timing MethodOptimum Injection Timing Method
Using an optimization framework
Vary injection timing for every torque/speedcombination (over 200 map points, ~100 executionsper point)
Computationally prohibitive
Parallel computer framework
Run as many maps as you want at differentinjection timings
Coalesce data with a Matlab-based routineOne map = ~5 minutes
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Injection Timing MapsInjection Timing Maps
Engine SpeedEngine Speed
OutputTorque
OutputTorque
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Optimum Injection Timing MapOptimum Injection Timing Map
RPMRPMFuelingFueling
RateRate
Timing
Timing
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Variable Compression Ratio EngineVariable Compression Ratio Engine
Hypothetical investigation of novel enginedesign
Find the ideal fuel consumption benefit
Apply ideal transmission techniques from previousslides
Determine how BSFC can be optimized atvarious power levels
First maximize power density to find engines
power upper boundAllow engine controller to change parameters that
are not normally variable
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Problem FormulationProblem Formulation For each power level :
50, 100, 200, 300, 400, 500 kW
Minimize BSFC, subject to:overall phi < 0.6
20% < percent premixed burn < 40%
peak cylinder pressure < 150 bar
Variables:
Inlet manifold pressure
Compression ratioInjection timing
Fuel
Engine speed
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Same Engine - Different MapsSame Engine - Different Maps
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
VCRE - Combined MapVCRE - Combined Map
RPMRPM
TOR
QUE
TOR
QUE
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Ideal BSFC Line vs. Power Level
170
180
190
200
210
220
230
240
50 100 150 200 250 300 350 400 450 500
Power (kW)
BSFC
(g/kW-hr)
vcre_bsfc
base_bsfc
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Hybrid Powertrain InvestigationsHybrid Powertrain Investigations
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Demands on Engine - CVT vs. 5-SpeedDemands on Engine - CVT vs. 5-Speed
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Demands on Motor - CVT vs. 5-SpeedDemands on Motor - CVT vs. 5-Speed
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Battery SOC - CVT vs. 5-SpeedBattery SOC - CVT vs. 5-Speed
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Zero Delta SOC - CVT vs. 5-SpeedZero Delta SOC - CVT vs. 5-Speed
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Additional Hybrid Clustering ScenariosAdditional Hybrid Clustering Scenarios
Power-Assist
Battery
Recharge
40
20
60
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Future DirectionsFuture Directions How realistic is the variable compression ratio
engine for the driving cycles and vehicles we areconsidering?
How can we better quantify the benefits ofincreased flexibility in transmission parameters?
What are the effects of injection timing andvariable valve timing on engine mapcharacteristics?
Is it better to cluster points around optimumpower levels on an engine map or disregard thatan engine can be described by a single map?
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Integration with Target CascadingIntegration with Target Cascading Parameterize engine torque curve
Maximize engine turndown ratio whilemeeting mobility constraints
Match maximum torque curve with a real
engine defined by high fidelity model Use engine visitation points in conjunction
with control strategies to meet BSFC and
emissions targets
Send results back to top level for verificationand subsequent iteration
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Parameterized Max Torque Curve - IParameterized Max Torque Curve - I
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Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Parameterized Max Torque Curve - IIParameterized Max Torque Curve - II
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
Sample Torque CurvesSample Torque Curves
Min cluster area Min rated torque
Min rated power
A i R h C
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
EngineEngineMatchingMatching
SubproblemSubproblem
A t ti R h C t
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Automotive Research Centerarc
Diesel Engine Optimization MethodologiesDiesel Engine Optimization Methodologies
NAC
ConclusionsConclusions
High fidelity engine model can be used atdifferent levels in the design process
Methods have been illustrated on a variety ofdifferent engines
Continue feed-backward work with ADVISORand extend methodology to VESIM