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WLTP Validation3 test result ~ Road load determination ~

WLTP Validation3 test result ~ Road load determination ~. DTP-ICE group under GRPE/WLTP informal group 20th-21st Feb. 2013 AECC/ACEA, Brussels. Proposed by Japan. 1. Table of contents. Purpose Test matrix of Validation 3 test Test results 3.1. Equivalence of ATF temperature

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WLTP Validation3 test result ~ Road load determination ~

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  1. WLTP Validation3 test result~ Road load determination ~ DTP-ICE group under GRPE/WLTP informal group 20th-21st Feb. 2013 AECC/ACEA, Brussels Proposed by Japan 1

  2. Table of contents • Purpose • Test matrix of Validation 3 test • Test results 3.1. Equivalence of ATF temperature 3.2. Stability of vehicle condition 3.3. Impacts of the number of coastdown on CO2 • Summary • Proposal of warming up condition for RLD Appendix.

  3. 1. Purpose on ROAD Seeking [Appropriate warming up condition] • Warming up speed • Speed adjustment (Engine brake) on DYNO Seeking [Similar warmed up condition] • Warming up speed • Speed up condition (by vehicle drive or by CHDY roller) • Number of replication of coasting down Check [Emission & CO2 impact] • 1st-3rd coast down average and 9th coast down. Veh. B ： 3.5 L, Van, FF, 6AT Veh. A ： 2.0 L, Sedan, FF, 5AT

  4. Table of contents • Purpose • Test matrix of Validation 3 test • Test results 3.1. Equivalence of ATF temperature 3.2. Stability of vehicle condition 3.3. Impacts of the number of coastdown on CO2 • Summary • Proposal of warming up condition for RLD Appendix.

  5. 2.1.1. Test matrix - on ROAD - 155 kph XX kph Evaluate the effects of warming up condition on ATF temperature ‘**) warming up was conducted until the vehicle become stabilized (go-around: 1~3 times or 5 min. ) 5

  6. 2.1.2. Test sequence of On-road test Start Measurement of Vehicle mass Measurement of Vehicle mass Brake adjustment (80 -> 20 kph = 10 sec.) Weight adjustment / Refueling Warming up XXX kph * 5 ~ 45 min. Repetition ≥3 Unstable fulfill Check stabilization End Stable Accelerate to 155 kph Cruising at 155 kph Approx. 10 sec. Coasting down Yes Split? No

  7. 2.2. Test matrix - on DYNO -Seeking [Similar warmed up condition] Seeking similar warmed up condition as ‘on Road’ Acceleration: v*a = 6 m2/s3 (75%tile of WWW database) 7

  8. Table of contents • Purpose • Test matrix of Validation 3 test • Test results 3.1. Equivalence of ATF temperature 3.2. Stability of vehicle condition 3.3. Impacts of the number of coastdown on CO2 • Summary • Proposal of warming up condition for RLD Appendix.

  9. 3.1.1. Comparison of ATF temperature – Vehicle A ◆on ROAD ◆on DYNO, speed up by roller ◆on DYNO, speed up by vehicle Coast-down Converge Warming up 155kph-Engine brake Decrease Coastdown×9 Warming up Warming up Coastdown×9 • When the acceleration was operated by roller, the ATF temperature was gradually decreased and differ from on-road condition. • When the acceleration was operated by vehicle drive, the ATF temperature converge on stable temperature.

  10. 3.1.2. Comparison of ATF temperature – Vehicle B ◆on ROAD ◆on DYNO, speed up by roller ◆on DYNO, speed up by vehicle Coast-down Warming up Decrease Converge Warming up Warming up Coastdown×9 Coastdown×9 • When the acceleration was operated by roller, the ATF temperature was gradually decreased and differ from on-road condition. • When the acceleration was operated by vehicle drive, the ATF temperature converge on stable temperature.

  11. 3.1.3. Temperature difference between ‘on ROAD’ and ‘on DYNO’ [Comparison of temperature at the end of warming up] 5.8 2.6 Warming up speed The warming up speed that the vehicle conditions become similar between on road test and on dyno. test is 120 km/h.

  12. 3.2.2. Mechanical friction of vehicle Detail of road load on DYNO RLdyno = RLtarget – MFvehicle - MFCHDY Target RL CHDY setting load [RLdyno] (adjuster) Road load (N) Mechanical friction of vehicle (variable value depend on warming up condition) Mechanical friction of CHDY (fixed value) Speed (km/h) (*) CHDY: Chassis dynamometer Need to be stable (*) RLdyno: CHDY setting load, RLtarget: Target RL, MFvehicle: Mechanical friction of vehicle, MFCHDY: Mechanical friction of CHDY

  13. 3.2.2. Stability of vehicle condition (Vehicle A) 30N warming up speed 20N No. of coastdown Speed warming up speed No. of coastdown Speed • In 1st coastdown, mechanical friction is reduced with increasing of warming up speed • Mechanical friction is increased with increasing of number of coastdown

  14. 3.2.2. Stability of vehicle condition (Vehicle B) 30N warming up speed 20N No. of coastdown Speed warming up speed No. of coastdown Speed • In 1st coastdown, mechanical friction is reduced with increasing of warming up speed • Mechanical friction is increased with increasing of number of coastdown

  15. 3.2.3. Focus on warming up at 120 km/h Veh. A, by Roller Veh. A, by vehicle Better Increasing Warming up at 120 km/h Warming up at 120 km/h Stable(except 1st CD) Veh. B, by Roller Veh. B, by vehicle Better Increasing Warming up at 120 km/h Warming up at 120 km/h Stable(except 1st CD) Mechanical friction is increasing with no. of coastdown, when acceleration is operated by CHDY roller

  16. 3.3. Impacts on CO2 It was observed to lower CO2 value when the CHDY setting RL is set based on 9th coastdown. [Vehicle A] Warming up condition: 135kph, accelerated by Roller 0.8% 0.2% 0.7% 0.3% [Vehicle B] Warming up condition: 135kph, accelerated by Roller 2.1% 1.4% 2.9% 0.6% 1.7%

  17. Table of contents • Purpose • Test matrix of Validation 3 test • Test results 3.1. Equivalence of ATF temperature 3.2. Stability of vehicle condition 3.3. Impacts of the number of coastdown on CO2 • Summary • Proposal of warming up condition for RLD Appendix.

  18. 4. Summary • Common • ATF temperature was varied depending on warming up vehicle speed both on road test and on dyno. test. • The most similar warming up condition on ATF temperature between on road test and on dyno. test is vehicle speed of 120 km/h. • On dyno. test • When the acceleration was operated by roller, the ATF temperature was gradually decreased and gap to on-road test was appeared. • When the acceleration was operated by vehicle drive, the ATF temperature converge on stable temperature. • The mechanical friction of vehicle varied depending on dyno. setting method such as vehicle speed, number of coastdown and acceleration method. Then dyno. setting method affect CO2 value. • In order to obtain an appropriate road load and dyno. set value, it is necessary to define a detail warming up condition in WLTP gtr text.

  19. Table of contents • Purpose • Test matrix of Validation 3 test • Test results 3.1. Equivalence of ATF temperature 3.2. Stability of vehicle condition 3.3. Impacts of the number of coastdown on CO2 3.4. Effects of Engine brake on ATF temperature • Summary • Proposal of warming up condition for RLD Appendix.

  20. [Example] 120kph×30m 120kph 120kph 5. Proposal of warming up condition for RLD In order to obtain an appropriate CO2, Japan propose the following warming up condition and Dyno. setting method. (*) Vmax_vehicle [ * X] < 120 km/h: Vwarming_up = Capped speed (= Vmax_vehicle [ * X] )

  21. Table of contents • Purpose • Test matrix of Validation 3 test • Test results 3.1. Equivalence of ATF temperature 3.2. Stability of vehicle condition 3.3. Impacts of the number of coastdown on CO2 3.4. Effects of Engine brake on ATF temperature • Summary • Proposal for warming up condition for RLD Appendix.

  22. 3-run average method • set an initial road load • Ad=0.5At, Bd=0.2Bt, Cd=Ct • suffix: d = dyno setting load, t = target • warming up [120 km/h×30 min.] • coasting down 3 times • calculate the mean total friction • adjust the dyno setting load subtract Total friction-1~3 Target RL Initial RL as CHDY setting load Ad = 0.5*At, Bd = 0.2*Bt, Cd = Ct Adjusted CHDY setting load

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