\"

Suresh S Iyer

Senior Research Associate, Bus Research and Testing
The Larson Institute
The Pennsylvania State University, United States


Conference Day 2

15:00 PM Uncertainties in emissions measurement

  • Sources of uncertainties: Full scale dilution systems, partial dilution systems, raw exhaust measurements
  • Time alignment of concentration signals in PEMS
  • Effect of pressure signal filter on time alignment of flow rate signal

Workshop

08:30 AM Ensuring measurement accuracy: A key question to RDE testing (I)

Challenges in vehicle emissions measurements
  • Partial sampling systems: Variable dilution ratio, Constant dilution ratio
  • Raw exhaust measurements
  • Full scale dilution systems: Dilute bag, Dilute continuous
  • General issues: Instrument ranges [Species (example CO), Fuels (example diesel vs. CNG)], Condensation in tunnel, Particulate measurements (weight based)

10:30 AM Ensuring measurement accuracy: A key question to RDE testing (II)

Correction of transient emission signal dynamics for in-lab and RDE measurements
  • Problem setting, distortions of the transient content of emission measurement signals, effect on emission calculations
  • Modelling of a measurement setup as a dynamic system
  • Model calibration and emission signal reconstruction
  • Application examples