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RDE COM Meeting16.12.2011ACEAPage 1
Random Cycle Generator
RDE COM Meeting16.12.2011ACEAPage 2
Random Cycle GeneratorScheme
PC-Roller Test
WLTP Database(> 450TShorttrips)Max.
acceleration-Ability vehicle. (f/v)
V_profileN, Mdexhaust
v_profilePhases
Random Cycle Generator
Shiftpoints
Transmission-
model
RDE-Evaluation (bags, windows,….)
RDE results
WLTP Database(> 450TShorttrips)
WLTP Database(> 450TShorttrips)
RDE COM Meeting16.12.2011ACEAPage 3
Main principle
Speed
time
Vmax < 60 km/h Vmax 60 – 100 km/h Vmax 100 km/h
rural
RDE COM Meeting16.12.2011ACEAPage 4
0
5
10
15
20
25
30
0 500 1000 1500 2000 2500
random Cycle in s
1300 Complete Random Cycles
400 Complete Random Cycles
Rel.
Fre
qu
en
cy [
%]
Random Cycle Duration Statistical Distribution
RDE COM Meeting16.12.2011ACEAPage 5
Work Plan Testing
RDE COM Meeting16.12.2011ACEAPage 6
Work Plan TestingRandom Cycle / PEMS Testing
a_mean_pos [m/s²]
NOx [g/km]
Comparison NOx emissions of diesel hot start tests
0
0,2
0,4
0,6
0,8
1
1,2
1,4
0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9
Random Cycle PEMS
RDE COM Meeting16.12.2011ACEAPage 7
First Experiences
I. Practicability- System readiness about 50% (10 weeks basis)- Modifications needed on cars - IUVP critical - Stationwagon cars and SUV’s most suitable- legalization from authority
II. Sources of errors1. Device issues
1. PEMS-tests not reproducible2. No plausibility check possible3. Need to ensure correct operation of PEMS before every test
2. Ruggedization
III. Safety - Risk of CO-exposure - Mounting of equipment - Risk of burning due to accessible pipes - Drive on public roads with Helium and Hydrogen bottles
PEMS
RDE COM Meeting16.12.2011ACEAPage 8
Timeline
RDE COM Meeting16.12.2011ACEAPage 9
Timeline
RDE COM Meeting16.12.2011ACEAPage 10
Timeline
Lab procedure: • First prototype of Random Cycle available in mid Jan 2012.• Generator is based on a Matlab tool to be used by everyone.• Total new approach in the emission legislation (No experience).• Driveability information so far limited to fixed RDE cycles
(one time effect).• Prototype allows to “simulate” PEMS road testing @ lab by
choosing similar profile, check comparability to road measurement
Road procedure:• PEMS measurements in principle known for HD, but application for
PC new.• First experiences exists for some weeks show already the need for
further investigation. • Very few (<10) PEMS measurement results in the database.
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