specific dynamic boundary conditions for weakly motorized vehicles … · 2017-03-13 ·...
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Thursday9March17
LCVSpecificdynamicboundaryconditionsforweaklymotorizedvehicles
Note:“weaklymotorized”heremeansvehicleswitharesultinglowpower-weightratio,notunder-poweredvehicles
TNO95%
urban 15,5
rural 16,8
motorway 15,5
v×apos[m²/s³] meanv[km/h]
urban 17,3 27,4
rural 20,8 74,3
motorway 17,8 105,3
0
5
10
15
20
25
30
0 20 40 60 80 100 120 140
95percentilev×apos
meanv[km/h]
current "PC" limit
95%
urban
rural
motorway
TNO urban
TNO Rural
TNO motorway
JUSTIFICATIONOFSPECIFICBOUNDARYCONDITIONSFORWEAKLYMOTORIZEDVEHICLES
• Weaklymotorizedvehiclesexhibitlimiteddrivingdynamics,henceaggressivedrivingdoesnotmanifestitselfthroughlargevaluesofv×apos
• Findingsfrom70tripssampledbyTUGrazand20tripsofTNO’sproposal“DrivingboundaryforN1(16June2016inBrussels)”:
Currentv×aposlimitscomparedtoLCVtrips
0,075×vk+15,26 -0,097×vk+28,04
rural
JUSTIFICATIONOFSPECIFICBOUNDARYCONDITIONSFORWEAKLYMOTORIZEDVEHICLES
0
5
10
15
20
25
0 20 40 60 80 100 120
95percentilev×apos
meanv[km/h]
v×aposlimitcurvesforweaklymotorizedvehicles
current "PC" limit
95%
urban
rural
motorway
TNO urban
TNO Rural
TNO motorway
15,5
16,8
15,5
v×apos[m²/s³]
meanv[km/h]
17,3 27,4
20,8 74,3
17,8 105,3
Assumption:TNOmeanv[km/h]sameasthemeanvofTUGraz‘sdataforallofTNO‘stripdatapoints
0,075×vk+15,26 -0,097×vk+28,04
rural
Availabilityofdata:70tripssampledbyTUGraz20tripsofTNO’sproposal
PROPOSALSTRUCTUREOFAMENDEDV×APOSLIMITCURVESFORWEAKLYMOTORIZEDVEHICLES
Tripinvalid
Yes
Yes
No
Tripvalidintermsofthedynamicevaluation
StartRDEtripevaluation
PMRTM≤44W/kg
The95Percentile(v×apos)valueperspeedbinis
<amendedlimitsforLCVs
The95Percentile(v×apos)valueperspeedbinis
<currentlimits
Yes
Tripinvalid
No No
DeterminationofPMRTMàRDEPowertomassratio:Ratedenginepowerdividedbythevehicle‘sactualtestmass(TM)
JUSTIFICATIONOFSPECIFICBOUNDARYCONDITIONSFORWEAKLYMOTORIZEDVEHICLES
• ForthepurposeofRDE,avehicleshouldbeconsideredasweeklymotorized,ifPMRTM≤44W/kg.
TheWLTCclass2PMRlimitof34W/kgisinapplicablefortheRDEevaluation,astheRDEPMRTMismeasuredusingtheactualtestmassandnotthecurbmassofthevehicle.
• TheTNOinvestigationincludesvehicleswithPMRsfrom22W/kgupto44W/kg
PMRTMdistinction-commonlyandweaklymotorizedvehicles
PMRof44W/kg
Typical PMR distribution in a vehicle fleet
JUSTIFICATIONOFSPECIFICBOUNDARYCONDITIONSFORWEAKLYMOTORIZEDVEHICLES
Reg.(EC)No692/2008,ANNEXIIIA,Appendix7ashouldbeamendedasfollows:Toparagraph4thefollowingpointshouldbeadded:
“Distinctionbetweencommonlyandweaklymotorizedvehicles
TheachievabledrivingdynamicsinaRDEtriparebasedonthepower-to-massratio(PMRTM)ofavehicle.TheRDEPMRTMisdefinedbytheratedenginepowerdividedbythevehicle‘sactualRDEtestmass(TM).
• TodeterminetheoverallexcessofdrivingdynamicsduringtheRDEtripforvehicleswhichhaveaPMRTM≤44W/kg,theverificationofv×apos_[95]describedin4.xshallbeused.
• TodeterminetheoverallexcessofdrivingdynamicsduringtheRDEtripforvehicleswhichhaveaPMRTM>44W/kg,theverificationofv×apos_[95]describedin4.yshallbeused.”
JUSTIFICATIONOFSPECIFICBOUNDARYCONDITIONSFORWEAKLYMOTORIZEDVEHICLES
Reg.(EC)No692/2008,ANNEXIIIA,Appendix7ashouldbeamendedasfollows:Toparagraph4thefollowingpoint(4.x)shouldbeadded:4.x Verificationofv×apos_[95]perspeedbin(withvin[km/h])for
vehicleswithaPMRTM≤44W/kg
• If<74,6km/hand(v×apos)k_[95]>(0,075×vk+15,26)*isfulfilled,thetripisinvalid.
• If>74,6km/hand(v×apos)k_[95]>(-0,097×vk+28,04)*isfulfilled,thetripisinvalid.
*ThelimitcurvesarebasedonthetripssampledbyTUGraz