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This test plan outlines the validation process for RLD (Real Driving Emissions) in Japan, including evaluation of RL measurement, vehicle warming up, dyno setting, and the impact on emission and fuel consumption.
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WLTP-DTP-LabProcICE-143 WLTP Validation2 for RLD~ Validation test plan by Japan ~ ICE lab. proc. meeting 2012/9/4-6 Japan
Table of contents • Parameter list for RLD • Overview of Validation test for RLD in Japan • Evaluation for RL measurement • Warming up condition • Evaluation for Dyno. setting • Warming up condition • Speed up condition • Coast down without absorption method • Evaluation of effect for dyno setting method
1. Parameter list for RLD Validation JAPAN plans to evaluate item #8,#9 and #11 by validation test. 1)Motoring by chassis dyno, 2)Coast down without absorption and 3)conventional method. JPN will evaluate method 2) and 3).
2. Overview of Validation test for RLD in Japan • Test item • RL measurement on road • Vehicle warming up • RL setting on dyno. • Vehicle warming up • Speed up condition at coasting down • Dyno. setting method by coast down • Impacts on emission and fuel consumption • Schedule • Proving ground： 4 days • Chassis dynamometer ： 10 days • Test vehicle： 2 vehicles • Smaller： 2.0 Litter, Sedan, FF, AT, w/o ATF warmer • Bigger： 3.5 Litter, Van, FF, AT JARI proving ground Length：5,500 m× Width12 m Length of straight：1,112 m×2 Planning Prepare Analysis Reflect into gtr Test Analysis Test ICE DTP/DHC DTP/DHC? GRPE
Table of contents • Parameter list for RLD • Overview of Validation test for RLD in Japan • Evaluation for RL measurement • Warming up condition • Evaluation for Dyno. setting • Warming up condition • Speed up condition • Coast down without absorption method • Evaluation of effect for dyno setting method
3.1 Warming up condition for RL measurement • Objective • Evaluate effects of vehicle speed and split condition on the RL measurement. • Background • draft gtr 4.2.3: Warming up is done by vehicle driving only. Driving shall be cruising and speed limit is the coast down starting speed. In the split coasting down, the same condition is applied. • The coast down starting speed = Max. ref. speed + ΔV = 132+10+10=150 km/h (If Average deceleration method is applied) • draft gtr 4.3.1.3-4: Repeat the test, taking care to begin the coast-down at the same speed and preconditions. Although it is recommended that each coast-down run be performed without interruption, split runs are permitted if data cannot be collected in a continuous fashion for the entire speed range. For split runs, care shall be taken so that the vehicle condition be constant as much as possible at each split point. • On the split coasting down, more stable result can be obtained if we can clarify detail condition of vehicle warming up. • Measurement parameter • Vehicle speed, coasting time, Temperature (engine oil, transmission oil, tire, road surface, ambient air), wind speed (stationary & onboard)
3.2 Test matrix (draft) Evaluate effects on cruising speed and split condition on the RL measurement. (*) the figure inside () is as an example speed ‘**) warming up will be conducted until the vehicle become stabilized (go-around: 1~3 times )
3.3 Image of test proving ground Coasting down ⑦ regard as straight road ③ Engine brake ② Coasting Warming up / preconditioning (until stabilized: go-around approx. 2 times)
warming up speed: 70km/h Road load (N) warming up speed: 40km/h warming up speed: 150km/h Speed adjusting: Engine brake warming up speed 150km/h Speed adjusting: coasting down Speed (km/h) 3.4 Image of test result Confirm how much difference is there between each warming up condition
Table of contents • Parameter list for RLD • Overview of Validation test for RLD in Japan • Evaluation for RL measurement • Warming up condition • Evaluation for Dyno. setting • Warming up condition • Speed up condition • Coast down without absorption method • Evaluation of effect for dyno setting method
4.1 Warming up condition for Dyno. setting • Objective • Evaluate effects of vehicle speed on the Dyno. setting. • Background • draft gtr 6.3.3: the vehicle shall be preconditioned appropriately until normal vehicle operating temperatures have been reached. It is recommended that the vehicle should be driven at the most appropriate reference speed for a period of 30 min. During this preconditioning period, the vehicle speed shall not exceed the highest reference speed. • The highest reference speed = WLTC max. speed + 10 = 132 + 10 = 142 km/h • draft gtr 1.1.1.1.:The test vehicle shall be warmed up on the chassis dynamometer to the same condition as it was during the road test. • 150 km/h, 132km/h, etc. • Similar warmed up condition as the road test would help to obtain appropriate dyno set value. • Warming up condition • 150 km/h, 142km/h, 80km/h, 60 km/h, 40km/h • Measurement parameter • Vehicle speed, coasting time, Temperature (engine oil, transmission oil, tire, roller surface, ambient air)
coasting time will be longer Speed Temp. decreasing temperature Time 4.2 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
Test matrix Evaluate effects of dyno. setting on vehicle condition and Road load.
4.3 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 “1.1.1.2.2. 7.2.2.2.2. Coast down without absorption” method. • 7.1 Chassis-dynamometer setting by coast down method • 1.1.1.2.1. 7.2.2.2.1. Mortaring method • 1.1.1.2.2. 7.2.2.2.2. 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)
4.3 Comparison of Dyno. setting method Coast down 3rd Coast down Nth Coast down 2nd Coast down 1st • Warming up condition • 150 km/h • 142 km/h • 80 km/h • 60 km/h • 40 km/h • Initial load Zero absorption In coast down without absorption method, the total friction loss is calculated by the average of 3 coast down times (Reference) In SAE J2264, tentative load is set. And dyno set value is adjusted by each coast down.
Table of contents • Parameter list for RLD • Overview of Validation test for RLD in Japan • Evaluation for RL measurement • Warming up condition • Evaluation for Dyno. setting • Warming up condition • Speed up condition • Coast down without absorption method • Evaluation of effect for dyno setting method
Evaluation of effect for dyno. setting method • Evaluate of effects of dyno. setting method on Emission and Fuel consumption • Test cycle: WLTC ver.5
