Kanton Zürich Baudirektion AWEL Survey about functional efficiency … · 2018. 7. 12. · 1...
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Kanton ZürichBaudirektionAWEL
Survey about functionalefficiency of DPF during PTI inZürich – 22. ETH-NPC 2018Beat Gloor, AWEL Abteilung Luft
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• definition of the project• approach – basic points• measuring equipment• results• conclusion
Contents
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The project• cars comes for the PTI• only diesel cars• if possible only Euro 5b → Euro 6….• use and test different PN-measuring equipments• communicate the measuring technique, feasibility,
time required
requirements• no disturbance during PTI• no consequences for DPF malfunction → wording
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Method• data sheet for one week,• 7 lanes to monitor at the same time• to pick the relevant cars• PN-measuring (2 instruments) during the PTI
(drive to or from the control basement)• notice the value, complete data set if necessary,
identify DPF under the car
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Quelle: Blick/Keystone
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PN-measuring equipment• P-Trak (TSI) → CPC• Disc-mini (testo) → diffusion charging• Partector with heating (naneos) →
diffusion charging• NPET (TSI) → metas-approved PN-
measuring equipement for diesel engineswith dilution, dilution rate 1:10 and heatingto 350°C (CPC) power: 240V AC
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Equipment
P-Trak
Disc-miniPartector
NPET
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Method by evaluation the resultsList of examined cars and the measured values→ Euro 5b or younger → always DPF present→ Euro 5a oder older
measured value ≤ 300’000 → DPF presentmeasured value > 300’000 → database of
registration by Road Traffic LicensingDepartment:a) with COC Nr. → DPF yes/nob) without COC Nr. → comparison with thesame cars with COC and the same year offirst registration → DPF yes/no
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All cars - with and without DPF
262
500
328
all measured cars (1090)
Euro 5b…6
Euro 1...5a with DPF
Euro 1...5a without DPF
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Num
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f car
s
Year of first registration
number of measured cars with/without DPF after year of first registration
with DPF without DPF
all measured cars: 1090with DPF: 762without DPF: 328
PTI
Results
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2000 2001 2002 2003 2004 2005 2006 2007
Num
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fcar
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Year of first registration
cars Euro 3
without DPF with DPF
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2001 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
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Year of first registration
cars Euro 4
without DPF with DPF
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2008 2009 2010 2011 2012 2013 2014
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cars Euro 5a
without DPF with DPF
one car without DPF
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Results
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100000
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300000
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500000
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parti
cle
num
ber[
#/cm
^3]
counts
particle number concentration of cars Euro 5a with DPF
P-Trak
upper limit of measuring range of P-Trak
threshold value
value as expected
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Results
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[#/c
m^3
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particle number concentration of cars Euro 5b+
P-Trak
value as expected
threshold value
upper limit of measuring range of P-Trak
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Evaluation of all measured cars
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all measured cars (1090)
Euro 5b.. 6c DPF malfunction
Euro 5b.. 6c DPF in good condition
Euro 1…5a with DPF in good condition
Euro 1…5a with DPF malfunction
Euro 1…5a without DPF
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B5b->B6… >100'000 >30'000 <30'000 B00 <- B5a B00 <- B5a B00 <- B5a >250'000 >100'000 <100'000
Total failure increased good Total no PFS with DPF failure increased good
262 29 14 219 828 328 500 131 28 341
Results of the investigations relating toemission-standard and DPF-obligation
100% 11.1% 5.3% 83.6% 100% 26.2% 5.6% 68.2%
100% 39.6% 60.4%
DPF-obligation no DPF-obligation
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Year of first registration
all cars with DPF
DPF good function DPF malfunction
12.5% malfunctionby first PTI ?
A closer look
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Controlled cars with first registration 2011
190 cars with DPF
→ 159 cars Euro 5a→ 4 cars Euro 4→ 22 cars Euro 5b→ 5 buses Euro 5 (public transport)
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Cars Euro 5a with first registration 2011
190 cars w. DPF → 159 cars Euro 5a
total def %reason: tec. 2 0 0
free 8 3 38perio. 132 11 8empty 17 2 12___________________________________________________________________________
total 159 16 10%statistically verified results, no bias
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Conclusions I• the technology for PN-mesurement is functional
although with easier instruments• with this equipment I can measure 95% of that
cars without any doubt and I have a clearly result• for the 5% «doubt-results», I can use the metas-
aprooved equipment(s) or I inform the driver, thatthe DPF has to be replaced at least before nextPTI or the MIL indicate an error.
• time required for mesurement (~ 30 sec.)
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Conclusions II• we need a reliable battery powered PN-mea-
suring equipment, of handy-size with a sufficientmeasuring range
• handy-size = like P-Trak or Partectorbattery capacity = 5 hoursmeasuring ranged = 1000 – 10 million P/cm3
• we need threshold value(s) for PN, as low aspossible, as high as necessary
• we need a mandatory inspection instruction, for afast and reliable measuring
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Special thanks :• Strassenverkehrsamt Zürich,
E. Schubiger, U. Fröhli• Prof. Dr. J. Czerwinski, P. Conte UASB• group NPTI around Dr. A. Mayer• Dr. M. Fierz UASNWS• Vera Weichlinger, assistent
Thank you for your attention!
Are there any questions?
Beat Gloor, [email protected]
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