1. Validation of the PEMS System on the Chassis Dyno, Why?
– J. Draht, N/EA-522

2. Validation of the PEMS System– Why?
Vehicle speed signal
+/- 1 km/h is required for a g/km assessment; cannot be reached with GPS  ECU-signal is non-traceable; AUDI/ACEA: validation mandatory
Particle Number
currently only alternative measurement principles available calibration is depending on individual vehicle  validation recommended by JRC; AUDI/ACEA : validation mandatory
Exhaust Flow – Alternative Methods
calculations require data from non-traceable sensors (fuel flow, intake air flow) AUDI/ACEA: validation mandatory S
System performance check
Gas/PN analyzers, sensors, exhaust flow, ECU, time alignment  AUDI/ACEA: validation recommended
How do we know it is error free?
PEMS Info JRC, J. Draht N/EA-522,

3. Validation - Experimental setup on chassis dyno Example
PEMS Info JRC, J. Draht N/EA-522,

4. Validation – Report (snapshot)
Streckenbezogene Emissionen CO
CO2
NOx
Partikelanzahl
Strecke
[mg/km]
[g/km]
[#/km] km
Dyno
66.15
199.47
28.06
2.12E+11
13.01
PEMS
58.87
200.97
33.38
2.31E+11
rel. Abweichung
-11.0%
0.8%
19.0%
9.4%
abs. Abweichung
7.3
-1.5
-5.3
-2.0E+10
PEMS Info JRC, J. Draht N/EA-522,

5. Validation of the complete system under dynamic conditions (WLTC) is:
Summary
Validation of the complete system under dynamic conditions (WLTC) is:
ensuring high quality and consistency of RDE-LDV results with chassis dyno results
pre-requisite for the use of ECU signals for RDE-LDV (vehicle speed, fuel flow, intake air flow, …)
pre-requisite for applicability of alternative exhaust flow determination methods
a possible way forward for the introduction of PN PEMS
All results can be obtained by executing one single WLTC test with the PEMS system installed in parallel on the chassis dyno.
PEMS Info JRC, J. Draht N/EA-522,

6. Thank you!

7. PEMS 2.0, Correlation EFM vs PEMS 2.0 calc. massflow
PEMS Info JRC, J. Draht N/EA-522,

8. PEMS 2.0, Correlation EFM 1 vs EFM 2
PEMS Info JRC, J. Draht N/EA-522,