Proposal for In-use Data Conversion Technique ( Re-Categorization of in-use data )

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WLTP-DHC-03-02

Proposal for In-use Data Conversion Technique

( Re-Categorization of in-use data )

(*) WLTC : Worldwide harmonized Light duty driving Test Cycle

version 1 : 22 March 2010

proposed by JapanDHC group

under GRPE/WLTP informal group

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WLTP-DHC-03-021. Purpose

It was agreed that each CP has its own unique definition of each road type (urban/rural/motorway) during its 1st DHC meeting. This may lead the discrepancy on speed-acceleration distribution among CPs in same road category.

This document describes the technique to convert the in-use data into vehicle speed oriented categories.urban/rural/motorway -> low/middle/high speedThis technique can be used for other re-categorization inclu

ding more than three (3) divisions

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WLTP-DHC-03-022. Definition of Road Type

Urban Rural Motorway

IndiaPaved roads in urban areas with a speed limit ≤40 km/hour (exclude mountain areas)

Paved non-motorways outside and inside urban areas with a speed limit between 40 and 60 km/hour

Paved motorways (multi-lane roads specifically constructed and controlled for fast traffic) with a speed 60 to 80 km/hour

KoreaArterial, collector and local road inside and/or near central business district (CBD). Speed limit is from 40 to 80 km/h, depends on road type

Arterial, collector and local road inside non-urban area. Speed limit is from 50 to 80 km/h, depends on road type

Motorway which is designed, constructed and controlled for faster traffic in urban and rural area. Speed limit is from 100 to 120 km/h, depends on area

JapanDensely Inhabited District (DID)

・ Speed limit≦60km/h

・ exclude mountain areas

・ Non-Densely Inhabited District

・ Non motorways

・ exclude mountain areas

Motorways

(within City and between Cities)

・ exclude mountain areas

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WLTP-DHC-03-023.1. Data analysis process - Step A-1 -

Categorize the collected data into original matrix with weighting factor < Matrix : road type/vehicle category/time period >

Record the collected data duration in each matrix

Road

type

Vehicle

category

Urban Rural Motorway

Weekday

Week-end

Weekday

Week-end

Weekday

Week-endOn-peak

Off-peak

On-peakOff-peak

On-peakOff-peak

Passenger Car

Light Duty Commercial

Vehicle

Collected data set

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WLTP-DHC-03-023.1. Data analysis process - Step A-2 -

Weighting factor matrix The collected data duration

It is expected that the collected data volume in each matrix doesn’t match the weighting factor obtained based on vehicle statistical information.

on peak wU,PC,ON

off peak wU,PC,OFF

weekend wU,PC,E

on peak wU,LCV,ON

off peak wU,LCV,OFF

weekend wU,LCV,E

on peak wR,PC,ON

off peak wR,PC,OFF

weekend wR,PC,E

on peak wR,LCV,ON

off peak wR,LCV,OFF

weekend wR,LCV,E

on peak wM,PC,ON

off peak wM,PC,OFF

weekend wM,PC,E

on peak wM,LCV,ON

off peak wM,LCV,OFF

weekend wM,LCV,E

sum 1 sum 1 sum 1

wR,PC

LCV wR,LCV

PC wM,PC

LCV

LCV wM,LCV

urban wU

rural wR

motorway wM

PC

congestionroad vehicle

PC wU,PC

wU,LCV

on peak TU,PC,ON

off peak TU,PC,OFF

weekend TU,PC,E

on peak TU,LCV,ON

off peak TU,LCV,OFF

weekend TU,LCV,E

on peak TR,PC,ON

off peak TR,PC,OFF

weekend TR,PC,E

on peak TR,LCV,ON

off peak TR,LCV,OFF

weekend TR,LCV,E

on peak TM,PC,ON

off peak TM,PC,OFF

weekend TM,PC,E

on peak TM,LCV,ON

off peak TM,LCV,OFF

weekend TM,LCV,E

motorway TM

PC TM,PC

LCV TM,LCV

rural TR

PC TR,PC

LCV TR,LCV

road vehicle congestion

urban TU

PC TU,PC

LCV TU,LCV

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WLTP-DHC-03-023.2. Data analysis process - Step B -

Need to compensate the weighting factor of each matrix since the specific short trip is possible to move into different matrix.

(1) Calculate the compensated weighting factor (wi’)

WU,PC,ON’ = TU,PC,ON

WU,PC,ON × AU,PC

WU,PC,OFF’ = TU,PC,OFF

WU,PC,OFF × AU,PC

WU,PC,E’ = TU,PC,E

WU,PC,E × AU,PC

Same equation will be applied to others

+TU,PC,ON

WU,PC,ON

TU,PC,OFF

WU,PC,OFF

TU,PC,E

WU,PC,E+AU,PC =

WU,PC,ON WU,PC,OFF WU,PC,E+ +where

on peak wU,PC,ON'off peak wU,PC,OFF'weekend wU,PC,E'on peak wU,LCV,ON'off peak wU,LCV,OFF'weekend wU,LCV,E'on peak wR,PC,ON'off peak wR,PC,OFF'weekend wR,PC,E'on peak wR,LCV,ON'off peak wR,LCV,OFF'weekend wR,LCV,E'on peak wM,PC,ON'off peak wM,PC,OFF'weekend wM,PC,E'on peak wM,LCV,ON'off peak wM,LCV,OFF'weekend wM,LCV,E'

sum 1 sum 1 sum 1

motorway wM

PC wM,PC

LCV wM,LCV

rural wR

PC wR,PC

LCV wR,LCV

road vehicle congestion

urban wU

PC wU,PC

LCV wU,LCV

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WLTP-DHC-03-023.3. Data analysis process - Step C-1 -

Convert the each short trip data including the previous idling portion into new categories (Low/Middle/High) from original (Urban/Rural/Motorway) categories with the compensated WF (w’)

criteria : maximum vehicle speed of each short trip

Phase Max. speed of each ST

Low speed ~ 40* km/h

Middle speed 40* ~ 80* km/h

High speed 80* km/h ~

Proposed Criteria:

*) the specific vehicle speed subject to change based on the collected data.

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WLTP-DHC-03-023.3. Data analysis process - Step C-2 -

Time (s)

Spe

ed (

km/h

)

Time (s)

Spe

ed (

km/h

)

Time (s)

Spe

ed (

km/h

)

Low speed

database

Middle speed

database

High speed

database

Urban – ON Peak

Urban – Off peak

Urban - Weekend

wL,1=

wU,PC,ON'

wL,2=

wU,PC,ON'

wM,1=

wU,PC,ON'

wL,3=

wU,PC,ON'

wL,4=

wU,PC,OFF'

wM,2=

wU,PC,OFF'

wL,5=

wU,PC,OFF'

wM,4=

wU,PC,E'

wH,1=

wU,PC,E'

wM,3=

wU,PC,OFF'

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WLTP-DHC-03-02（修正版） 3-4. Data analysis process - Step D -

The collected data was converted into new categories.

New weighting factors （ wL, wM, wH ） are calculated as follows.

This process will be done in each data collection CPs. Then, move on to “2.2.3. Test Cycle Development - Step3 – in WLTP-DHC-02-04”

with slight modification.

ii,Hi,H

ii,Mi,M

ii,Li,L

ii,Hi,H

H

ii,Hi,H

ii,Mi,M

ii,Li,L

ii,Mi,M

M

ii,Hi,H

ii,Mi,M

ii,Li,L

ii,Li,L

L

TwTwTw

Tww

TwTwTw

Tww

TwTwTw

Tww

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WLTP-DHC-03-023.5. Data analysis process – Modification 1 -

・・

-16

-12

-8

-4

0

4

8

12

16

-20 0 20 40 60 80 100 120 140 160Speed (km/h)

Acc

ele

ratio

n (

km/h

/s)

M-1

-16

-12

-8

-4

0

4

8

12

16

-20 0 20 40 60 80 100 120 140 160Speed (km/h)

Acc

ele

ratio

n (

km/h

/s)

M-2

×

×

・・

・・

M,1　

M,2　

WM,1

WM,2

Speed-Acceleration distribution of each short trip should be multiplied by the compensated weighting factors (w’).

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WLTP-DHC-03-023.5. Data analysis process – Modification 2 -

Frequency distribution for idling & short trip duration also should be multiplied by the compensated weighting factors (w’).

Vertical Axis :

Number of data

the compensated weighting factor

×

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WLTP-DHC-03-023.6. Data analysis process

Then move on to“2.2.6. Test Cycle Development – Step6 – in WLTP-DHC-02-04” with no more modification.