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Parameter Setting for Validation 2 DTP Subgroup Lab Process Internal Combustion Engines

WLTP-DTP-LabProcICE-075. Parameter Setting for Validation 2 DTP Subgroup Lab Process Internal Combustion Engines (LabProcICE) Geneva, 8. June 2011. Content. Main objectives for WLTP LabProcICE Parameter setting for Validation 2 Road load determination Vehicle selection

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Parameter Setting for Validation 2 DTP Subgroup Lab Process Internal Combustion Engines

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  1. WLTP-DTP-LabProcICE-075 Parameter Setting for Validation 2 DTP Subgroup Lab Process Internal Combustion Engines (LabProcICE) Geneva, 8. June 2011

  2. Content • Main objectives for WLTP LabProcICE • Parameter setting for Validation 2 • Road load determination • Vehicle selection • Lab procedures • Measurement equipment

  3. Main Objectives for WLTP DTP LabProcICE Main objectives of WLTP as summarized in GRPE: • Worldwide harmonisation of test cycle and measurement procedure • Improved reproducibility and representativity Objective of EU-Commission (CARS21): • … minimize the current gap between CO2 value measured at type-approval and real world driving CO2 emissions should by the introduction of a new type-approval test cycle and procedures that are representative of on-road driving. Further objectives: • Improved cost/effectiveness of type approval procedure • Adaption to technical progress of measurement equipment • Adaption to technical progress of vehicles

  4. Approach for WLTP DTP LabProcICE (examples): • Reported are relevant tolerances and required setpoints of WLTP DTP LabProcICE for Validation 2 • Setpoint means the target value which the control system will aim to reach. The actual value must not show a systematic deviation from the setpoint. • The proposed setpoints for validation 2 will not anticipate future decision on pending issues.

  5. Relevant areas for measurement of CO2, energy consumption and pollutants within LabProcICE: • Road load determination • Vehicle selection and preparation • Lab procedures • Measurement equipment

  6. Parameter Road Load Determination I (not relevant for Validation 2): Vehicle selection for RLD: • Tire selection: Highest rolling resistance in RR-classes • Aerodynamic features (e.g. design line ): highest predicted sales volume • Aerodynamic options (e.g. roof-rails): > 50 % (?) predicted sales volume considered • Inertia classes: step width 60 kg • Tire pressure: Lowest recommended pressure of manufacturer specification • Tire tread wear: up to 60% • Wheel alignment and clearance as specified by manufacturer

  7. Road Load Determination II (not relevant for Validation 2): Road Load Evaluation: • One time moderate braking before vehicle warm up • Consideration of rotary masses as described (conform ISO 10521) • Averaging of forces instead of time segments (conform ISO 10521) • Vehicle coast down mode switched on if any

  8. Vehicle selection and preparation for dyno tests: • Vehicle mileage between 3000 and 15000 km • Dyno operation mode switched on if any • Tire pressure during testing on dyno • Automatic gearboxes: Default mode • Regional reference fuel used • AC and electrical devices switched off, Daytime Running Light on Setpoint: up to 50% over minimal tyre pressure as specified by the manufacturer

  9. Lab process (I) Dyno setting: • Vehicle in same warmed up condition as during the road load determination • Dyno thermal stabilized • Rotary masses considered with 3% for 4WD; 1,5 % for 2WD, if considered in RLD • Road load data (for Validation 2 not relevant) • Inertia classes step width 60 kg Dyno load setting tolerance: • 2 % > 50 km/h • 3 % ? 30 – 50 km/h • 10 % <30 km/h Setpoint: mid tolerance

  10. Setpoint: 298 K Setpoint: 50 % rH Setpoint: 24h Setpoint: no smoothing, no excessive throttle actuation Setpoint minimum 3 Lab process (II): • Lab and soak temperature 298 K -+ 5 K • Humidity5,5,<H<=12,2 gH20/kg dry air • Soak time 12-36 h without forced cooling down (6h with) • Gear shift points: fixed and GSI if available • Speed trace tolerance: + -3 km/h • Number of test repeats: (for validation only) • No external battery charging after preconditioning run • Difference EBatt to be monitored • Modal analysis to be performed in parallel (if available)

  11. Measurement Equipment: • Proportional fan up to vmax cycle , max. 120 km/h (see GRPE Jan. 2011) • Deviation Critical Flow Orifice Calibration <= 2% • True concentration of calibration gases within 1 % of stated value (AP TBD ) • NOx converter efficiency > 95 % • Linearity setting of analyzer Setpoint: mid tolerance

  12. Thanks for your attention. LabProcICE contact: Béatrice Lopez de Rodas - beatrice.lopez(at)utac.com Konrad Kolesa - konrad.kolesa(at)audi.de Stephan Redmann – stephan.redmann(at)bmvbs.bund.de

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