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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.