1. WLTP Validation2 for RLD ~ Validation test plan by Japan ~
WLTP-DTP-LabProcICE-165
WLTP Validation2 for RLD ~ Validation test plan by Japan ~
Revised: 2012/November/7
Japan 1

2. on ROAD on DYNO Purpose Seeking [Appropriate warming up condition]
Warming up speed
Speed adjustment (Engine brake)
Cruising speed for split runs
on DYNO
Seeking [Similar warmed up condition]
Speed up condition (by vehicle or by CHDY rollar)
Number of replication of coasting down
Check [Emission & CO2 impact]
1st-3rd coast down average, conventional, and 9th coast down.

3. Schedule & Test Vehicle
Test item
RL measurement on road
Vehicle warming up speed
RL setting on dyno.
Speed up condition at coasting down
Dyno. setting method by coast down
Impacts on emission and fuel consumption
Schedule
Proving ground： 4 days (11/16-18, 11/21-23)
Chassis dynamometer ： 10 days (11/26-12/7)
Test vehicle： 2 vehicles
Smaller： 2.0 Litter, Sedan, FF, AT, w/o ATF warmer
Bigger： Litter, Van, FF, AT
JARI proving ground
Length：5,500 m × Width 12 m
Length of straight：1,112 m×2
Aug.
Sep.
Oct.
Nov.
Dec.
Jan.
Feb.
Mar.
RL measurement
Dyno setting
WLTP meeting
Planning
Prepare
Test
Analysis
Test
Analysis
ICE
DTP/DHC
ICE
DTP/DHC 3

4. Test matrix - on ROAD -
Seeking the condition to obtain stable coast down time.
Condition
Split
Warming up condition (cruising speed)
speed adjusting
Dire-ction
No. of coast down
Phase 1 ( kph)
Phase 2 ( kph)
Phase 3 ( kph)
Phase 4 ( kph)
Ideal No
155 km/h -
Two-way 1
gtr proposal
Yes
(until stabilized)
Coasting
One way
at least 3 2
Saved time
Engine brakes 3
Max. Ref. speed
135 km/h (until stabilized)
Accelerate to 155 km/h & Coasting 4
realistic
120km/h (until stabilized) 　
120km/h (until stabilized) 5
2/3 of gtr proposal
100 km/h
(until stabilized 6
1/2 of gtr proposal
75 km/h 7
1/3 of gtr proposal
55 km/h (until stabilized) 8
As straight track
Accelerate 　
‘**) warming up will be conducted until the vehicle become stabilized (go-around: 1~3 times or 5 min. ) 4

5. Speed adjustment method
proving ground
Coasting down
②Engine brake
③Acceleration & Coasting
①Coasting
Warming up / preconditioning
(until stabilized: go-around approx. 3 times or 5 min.) 5

6. Confirm how much difference is there between each warming up condition
Image of test result
warming up speed: 75km/h
warming up speed: 120km/h
Road load (N)
warming up speed: 155 km/h
Speed adjusting: Engine brake
warming up speed: 55km/h
warming up speed 155 km/h
Speed adjusting: coasting down
Speed (km/h)
Confirm how much difference is there between each warming up condition
(Road load, T/M oil Temperature etc) 6

7. Descriptions for warming up condition (Annex4, 14.10.2012)
Definitions were changed
2.6. Reference speed
A vehicle speed at which a chassis dynamometer load is verified. Reference speeds may be continuous speed points covering the complete cycle speed range.
=> Reference speed: 0 ~ 131.3km/h (=> 0 ~ 135 km/h)
2.15. Speed range
Range of speed of chassis dynamometer roller between the maximum speed of the WLTC cycle corresponding to the test vehicle class plus 10 km/h and minimum reference speed of 20 km/h minus 5 km/h, over which the coastdown test is conducted.
=> Speed range: ~ 15 km/h (=> 145 ~ 15 km/h)
Warming up is done by vehicle driving only. Driving shall be cruising and speed limit is 10 km/h above the coastdown starting speed. In the split coasting down, the same condition is applied.
=> Cruising speed: Coastdown starting speed + 10km/h
=> In the split coasting down, the same condition is applied
The coastdown time corresponding to the speed Vj as the elapsed time from the vehicle speed (Vj + ΔV) to (Vj - ΔV) shall be measured. It is recommended that ΔV be 10 km/h when the vehicle speed is more than 60 km/h, and 5 km/h when the vehicle speed is 60 km/h or less.
=> ΔV: >60km/h ±10km/h, <=60km/h ±5km/h
Selection of speed points for road load curve determination
In order to obtain a road load curve as a function of vehicle speed, a minimum of four speed points, Vj (j = 1, 2, etc.) shall be selected. The highest speed point shall not be lower than the highest reference speed, and the lowest speed point shall not be higher than the lowest reference speed. The interval between each speed point shall not be greater than 20 km/h.
=> Max. speed point: >=131.3 (135) km/h, Min. speed point: <=20km/h
⇒ Speed points = at least 4 points, interval <= 20km/h

8. Warming up speed and Speed points for CL3 vehicles
Road load (N)
Vmax　131.3
Warming up speed
155
speed points 20 30 40 50 60 75 95
115
135 15 25 35 45 55 65 85
105
125
145
Vehicle speed (km/h)
The highest coastdown starting speed of CL3
For Class 3 vehicle, Warming up speed = 155km/h
9 speed points: 135，115，95，75，60，50，40，30，20 km/h）

9. Warming up speed in each vehicle class
Vmax<70kph
Vmax<90kph
Vmax<120kph
Vmax<135
135<=Vmax
Class 3
CL3 ver5.1 L~H
Vmax of test cycle：97.4 kph
Vcoastdown：110 kph
Vwarming_up：120 kph
CL3 ver.5 L~H
Vmax of test cycle ：97.4 kph
Vcoastdown： 110 kph
Vwarming_up ：120 kph
CL3 ver.5 L~ExH
Vmax of test cycle ：131.3 kph
Vcoastdown ：145 kph
Vwarming_up ：155 kph
Class 2
CL2 ver.2 L~M
Vmax of test cycle ：74.7 kph
Vcoastdown ：85 kph
Vwarming_up ：95 kph
CL2 ver.2 L~H
Vmax of test cycle ：85.2 kph
Vcoastdown ：100 kph
Vwarming_up ：110 kph
CL2 ver.2 L~ExH
Vmax of test cycle ：123.1 kph
Vcoastdown ：135 kph
Vwarming_up ：145 kph
Class 1
CL1 ver.2 L
Vmax of test cycle ：49.1 kph
Vcoastdown ：55 kph
Vwarming_up ：65 kph
CL1 ver.2 L~M
Vmax of test cycle ：64.4 kph
Vcoastdown ：75 kph
Vwarming_up ：85 kph

10. Test matrix - on DYNO - Seeking [Similar warmed up condition]
Seeking similar warmed up condition as ‘on Road’
Condition
Split
Warming up condition (cruising speed)
Way for speed up
No. of repetition of coast-down
Phase 1 ( kph)
Phase 2 ( kph)
Phase 3 ( kph)
Phase 4 ( kph) 1
same as RL measurement No
155 km/h * 30 min.
(trouble on cooling fan, tire, tail end connection ???)
by roller
9 times
(Max. coasting down number on Vilification mode for our facility) - 2
The highest reference speed
135 km/h * 30 min.
(gtr proposal) 3
by vehicle 4
120 km/h * 30 min. 5 6
100 km/h * 30 min. 7
75 km/h * 30 min 8
55 km/h * 30 min 9 10

11. Comparison of Dyno. setting method
3-run averaging method
Coast down
1st
Coast down
2nd
Coast down 3rd
Coast down 9th
Warming up condition
155 km/h
132 km/h
115 km/h
75 km/h
55 km/h
Initial load
Ad = 0.5*At, Bd = 0.2*Bt, Cd = Ct
In coast down without absorption method, the total friction loss is calculated by the average of 3 coast down times
We will set the initial load
(Reference)
In SAE J2264, tentative load is set.
And dyno set value is adjusted by each coast down. 11

12. Speed up condition at coasting down
Objective
Evaluate effects of vehicle speed up method in dyno. setting.
Background
It is expected that a mechanical friction and/or temperature will be different in the case of the speed up is operated by vehicle self or by Chassis dynamometer.
If coast down is repeated over and over, the difference of friction or temperature will be appeared.
Measurement parameter
Vehicle speed, coasting time, Temperature (engine oil, transmission oil, tire, roller surface, ambient air)
Image of result
Speed
Temp.
coasting time will be longer
Time 12

13. Descriptions for warming up condition on RL setting
Vehicle preconditioning
The power-absorption unit of the chassis dynamometer shall be set as specified in or , so that an adequate load will be applied to the test vehicle during preconditioning. Prior to the test, the vehicle shall be preconditioned appropriately until normal vehicle operating temperatures have been reached. This condition is deemed to be fulfilled when three consecutive coastdowns are completed within the given tolerance of Annex/chapter XXX. The dynamometer load for the vehicle warm-up shall be set as described in During this preconditioning period, the vehicle speed shall not exceed the highest reference speed.
The highest reference speed = WLTC max. speed
= km/h (or round up to 135km/h)

14. Comparison of Dyno. setting method
Objective
Evaluate effects of dyno. setting methods by coast-down
Background
There are 3 methods for dyno. setting by coast-down method in draft gtr. Japan is interested in the evaluation of “ Coast down without absorption” method.
7.1 Chassis-dynamometer setting by coast down method
Mortaring method
Coast down without absorption
Coast down with zero chassis dynamometer absorption at least three times, Then the total friction loss is calculated.
It is necessary to compare the current coast down method to new method.
Measurement parameter
Vehicle speed, coasting time, Temperature (engine oil, transmission oil, tire, roller surface, ambient air) 14

15. Test matrix - on DYNO - Check [Emission & CO2 impact]
Evaluate the effects of dyno. setting method on Emission and Fuel consumption
Test cycle: WLTC ver.5
Target RL
Warming up
RL setting
Test cycle
Number of test
gtr
155km/h
Coasting
135km/h * 30 min
3-run average
WLTC Cold 1
WLTC Hot 3
Based on 9th times coastdown
Worst 15

16. Appendix) RL setting for dyno.
Set Initial RL
Warming up：
XXX km/h×30 min.
Coastdown×9 times
speed up by roller or by vehicle drive
Calculate the difference to target RL
add the difference to initial RL
(3-run average, 9th coastdown)
*) DO not vilification sequence

17. Appendix) warming up for split run
155km/h
within 1 min
measurement