Progress Report of World-wide Light-duty Test Cycle. Prepared by WLTP-DHC under GRPE/WLTP informal group. 64 th GRPE 7 th June 2012 Palais des Nations, Geneva. Table of contents. Progress since last GRPE meeting Summary of Validation 1b Profile of WLTC ver.5 Gear Shift Prescription
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Prepared by WLTP-DHC
under GRPE/WLTP informal group
7th June 2012
Palais des Nations, Geneva
Progress since last GRPE meeting
Summary of Validation 1b
Profile of WLTC ver.5
Gear Shift Prescription
Open Issues Lists
Discussion on Open Issue (Cycle modification)
Discussion on Open Issue (Regional WF)
’11/9 10 11 12 ’12/1 2 3 4 5 6
Validation 1 Test
(WLTC Version 2)
Validation 1b Test
Add new parameter (v*a positive)
for cycle modification
Validation 2 Test
acquisition for LPV
Validation 1b Test
Concern on “Dynamic” profile
Concern for Low Powered Vehicle (LPV)
Vehicle speed basis
Exchange the strategy of each method,
then modified based on validation result
Engine speed basis
From the viewpoints of drivability, traceability and reproducibility, the following 31 portions are pointed out by India, JRC and Japan.
31: number of decimal places
It was agreed to modify 16 points out of 31 during 12th DHC meeting
Chi squared value of proposed WLTC v5 is identical to that of WLTC v4
95%tile of WWW database is 10 m2/s3
Max. of WLTC v5 is 11.2 m2/s3
95%tile of WWW database is 14 m2/s3
Max. of WLTC v5 is 16.7 m2/s3
95%tile of WWW database is 16 m2/s3
Max. of WLTC v5 is 19.7 m2/s3
95%tile of WWW database is 18 m2/s3
Max. of WLTC v5 is 20.9 m2/s3
The maximum v*a of WLTC ver.5 exceed 95%tile of WWW database
Flow chart for test cycle selection
Power to mass ratio
<= [ 22kW/t ]
<= [ 70kph ]
Power to mass ratio
<= [ 34kW/t ]
<= [ 90kph ]
<= [ 135kph ]
Threshold value (PtM, Speed) seem to be appropriate based on Validation1 by India, but final decision will be made later stage.
It was requested to develop the ex-High phase in Class2 for vehicle with more than [135kph] max. speed.
No major concern was observed on both cycles with the following suggestions to improve the traceability.
The Low powered vehicles show a deviation at the beginning of the cycle ~ 10-20 sec, where there is a shift at ~ 12 km/h
Smoothening transient profile of the cycle and during gear shift change from 1st to 2nd
Vehicles up to PMR 22 kW/t – engine response to speed change is sluggish.
The above suggestion will be taken into account before starting the Validation 2.
6.2. Discussion on Open Issue #8
for Class1&2 cycles
It was reported that some major vehiclesin Japan are forced to drive the cycle under the engine protection operation which is rarely happened in real driving conditions.
Japan proposed the modification of the WLTC ver.5 to eliminate the points in where some major vehicles come under the engine protection operation maintaining the amount of CO2.
India proposed the slight modification on M&H phases and that vehicles with max. speed up to 155 – 160 km/h in Class 3 are exempted to drive ex-High phase.
Some CPs have raised the concerns on above proposal since these modification may loose the representativeness of world-wide driving condition.
6.3. Discussion on Open Issue #8
for Class 3 cycle
Continue to have further discussion through Validation2 test program to find out the appropriate solution.
Adoption of regional Weighting Factor
India / Korea have reserved their positions since internal discussion is not taken yet.
Continue to have further discussion with possible solutions to accommodate the regional representativeness and world-wide harmonization.
Interim Report of Validation 2
Report of Validation 2
Agreement of OIL
Class 1&2 cycle
All open issues should be eliminated
Class 3 cycle
Next 14th DHC meeting will be set during next DTP meeting in September at JRC.
Main agenda will be
Interim report of Validation2 test results for all cycles
Discussion on Open Issues
(15th DHC meeting will be set around November 2012)