OCE Informal Document No. 49 Fourteenth Plenary Meeting of the Working Group On Off-Cycle Emissions 6 June 2006 Project scope Palais des Nations, Geneva, Switzerland TASK 1 – Assessment of WNTE concept in current GTR • Existing driving patterns data for representative categories of vehicle type and application (from WHDC database) • Simulation of PM and NO x emissions per category using current PHEM model (Euro 3 engine map) • Graphical presentation of emissions in/outside the NTE control zone 1 6 April 2006
Project scope Output of Task 1: • Timeshare in/outside the NTE control zone • Positive work in/outside the NTE control zone • Emissions in/outside the NTE control zone • Effect of interval length on these shares of time/work/emissions 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% Time [s] Positive Engine Work Cumulated emissions Cumulated emissions [kWh] (with 30 seconds rule) [g] (without 30 seconds rule) [g] 2 6 April 2006 within WNTE zone outside WNTE zone
Project scope TASK 2 – Assessment of NTE concept for future HD engines Based on: • Limited amount of existing data for Euro 4/5 engines (quantitative) • Expert views on Euro 5/6 engines behaviour/calibration (qualitative) Resulting in: • Identifying possible limitations in NTE zone proposal TASK 3 – Review of the effectiveness of WHDC and WNTE concepts as a whole • Coverage of ‘higher risk’ areas • Elimination of defeat devices and/or irrational control strategies • Identifying possible limitations 3 6 April 2006
Project scope TASK 4 – Consider rationale for improving NTE definitions: • Changing engine speed limit of NTE zone • Review of carve outs (e.g. 30% power, PM carve out) • 30 seconds interval • Review of compliance factor (1.25, 1.5 or other) TASK 5 – Assessment of ambient temperature and pressure boundaries • Analysis of existing on-road measurements • Expert view for future engine technology TASK 6 – Review of alternative NTE concepts Including (but not limited to): • Work-based window • Compliance factor (based on BSFC instead of torque) 4 6 April 2006
Examples 5 6 April 2006
Results for NO x and PM (truck/trailer in rural driving) Relative NOx contribution Relative PM contribution 1.0 1.0 NTE zone NTE zone 0.9 0.9 0.8 0.8 0.7 0.7 0.6 0.6 Engine torque (norm.) Engine torque (norm.) 0.5 0.5 0.4 0.4 0.3 0.3 0.2 0.2 0.1 0.1 0.0 0.0 Vehicle: Truck with trailer Vehicle: Truck with trailer Engine: Euro 3 (average) Engine: Euro 3 (average) -0.1 -0.1 Driving cycle: Rural Driving cycle: Rural 00 00 Shifting: Economic/fast Shifting: Economic/fast -0.2 -0.2 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1. Engine speed (norm.) Engine speed (norm.) 6 6 April 2006
Results for NO x and PM (city bus in urban driving) Relative NOx contribution Relative PM contribution 1.0 1.0 NTE zone NTE zone 0.9 0.9 0.8 0.8 0.7 0.7 0.6 0.6 Engine torque (norm.) Engine torque (norm.) 0.5 0.5 0.4 0.4 0.3 0.3 0.2 0.2 0.1 0.1 0.0 0.0 Vehicle: City bus Vehicle: City Bus Engine: Euro 3 (average) Engine: Euro 3 (average) -0.1 -0.1 Driving cycle: City Driving cycle: City 00 00 Shifting: Economic/fast Shifting: Economic/fast -0.2 -0.2 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1. Engine speed (norm.) Engine speed (norm.) 7 6 April 2006
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