RDE TOOL EVALUATION

ZM-E-10, 13.09. 2013

Bittermann, Brüne, Land

MEASUREMENTS BY BMW

RDE TOOL EVALUATION CONTENT

Tool evaluation

• influence driving behavior

• influence of trip composition

• tool robustness test with 15 PEMS measurements

with the same vehicle on the same road

RDE TOOL EVALUATION CONTENT

Tool evaluation

• influence driving behavior

• influence of trip composition

• tool robustness with 15 PEMS measurements

with the same vehicle on the same road

RDE TOOL EVALUATION AVERAGE NOX-EMISSIONS COMPARED TO 50% AND 90% PERCENTILE

Ø real emissions

weighted CLEAR Tool

50% windows EMROAD

90% window EMROAD

0,00

0,10

0,20

0,30

0,40

0,50

0,60

0,70

0,80

0,90

1,00

NO

x [g

/km

]

all norm. sev. soft extr.

Abs. Windows 5139 2934 876 66 1263

57% 17% 1% 25%

ROUTE: BMW PEMS STANDARD

1/3 CITY, 1/3 RURAL 1/3 HIGHWAY

normal driver 320d Tool version V5 60

0,00

0,10

0,20

0,30

0,40

0,50

0,60

0,70

0,80

0,90

1,00

NO

x [g

/km

] all norm. sev. soft extr.

Abs. Windows 4617 982 636 85 2914

21% 14% 2% 63%

aggressive driver 320d Tool version V5 60

NORMAL DRIVER

except of the normal driving

windows, no big differences

AGGRESSIVE DRIVER

significant differences

correlation shows a strong dependency on the driving behavior

RDE TOOL EVALUATION CONTENT

Tool evaluation • influence driving behavior

• influence of trip composition

• tool robustness with 15 PEMS measurements on the same road

validation latest CLEAR release • new feature CITY-DRIVING

RDE TOOL EVALUATION:EMROAD TOOL COMPARISON OF PEMS DRIVE COMPOSITION SAME MEASUREMENT SHOULD LEAD TO SAME RESULTS AFTER TOOL PROCESSING

original route: Start JRC head quarter rearranged route: Start on the top of sacromonte

original PEMS drive rearranged PEMS drive

START

START

RDE TOOL EVALUATION:EMROAD TOOL SAME MEASUREMENT DIFFERENT RESULTS AFTER JRC PROCESSING

same PEMS drive, re arrangement of the time tracking (start top of the mountain)

same Ø NOx modal real emissions

+30% NOx due to averaging window method

0

20

40

60

80

100

120

140

modal average NOx [real emissions]

EMROAD 50% perc. NOx

100 100 100

130

[%]

original PEMS drive

rearranged PEMS drive

RDE TOOL EVALUATION CONTENT

Tool evaluation

• influence driving behavior

• influence of trip composition

• tool robustness with 15 PEMS measurements

with the same vehicle on the same road

RDE TOOL EVALUATION DETECTION OF NORMAL DRIVING [STATISTICAL APPROACH]

boundary conditions

heavy vehicle with SCR

all trips with the same vehicle

all trips on RDE BMW standard route Steyr

different driving styles / different drivers

statistical approach for the validation

of the tool robustness

NO

x

CO2 [g/km]

RDE TOOL EVALUATION DETECTION OF NORMAL DRIVING [STATISTICAL APPROACH]

Ø real emission

weighted TUG 50% JRC NORMAL

NO

x

CO2 [g/km]

Ø real emission coefficient of determination

0.97

0.93

coefficient of determination

0.97

0.79

NORMAL AGGRESSIVE NORMAL AGGRESSIVE

CLEAR [TUG] TOOL EMROAD [JRC] TOOL

CLEAR shows lower variance CLEAR is more robust

RDE TOOL EVALUATION

Thank You for Your attention!

konstante - pulsierende Fahrweise

20 40 60 80 100 120 140 160Time[s]

75

100

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en

gin

etr

q[N

m]

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ve

hic

leS

pe

ed

[km

/h]

konstante Fahrweise

-0.15

-0.05

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0.65

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0.95

CO

2_

KV

[g/s

] (R

el.H

äu

f.)

0.049%

99%

0.049%

0

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en

gin

etr

q[N

m]

1000 1250 1500 1750 2000 2250 2500 2750EngineSpeed[U/min]

CO2_KV[g/s]

pulsierende Fahrweise

-0.15

-0.05

0.05

0.15

0.25

0.35

0.45

0.55

0.65

0.75

0.85

0.95

CO

2_

KV

[g/s

] (R

el.H

äu

f.)

6.9%

62%

6.8%

6.8%

3.4%

3.4% 0.048%

0

50

100

150

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400

en

gin

etr

q[N

m]

1000 1250 1500 1750 2000 2250 2500 2750EngineSpeed[U/min]

CO2_KV[g/s]

RDE TOOL EVALUATION- BACKUP

MAW=100 g/km CO2

MAW=113 g/km CO2

constant driving

intermittent driving

constant driving

intermittent

driving

DETECTION OF NORMAL DRIVING

EMROAD (JRC) In this example the Ø CO2 window emissions between constant

driving and intermittend driving are differing by 13%.

The EMROAD Tool detects severe driving only in case of Ø CO2

emissions higher than WLTP + 25%.

-> Driving situations with partially high load at moderate Ø CO2

emission would be classified as normal driving.

CLEAR (TUG) Using the CLEAR method the different load conditions occuring at

constant driving and intermittend driving are detected.

-> Different loads conditions lead to different time distributions in the

engine map and thus to a differing emission correction.

RDE TOOL EVALUATION- BACKUP

DETECTION OF NORMAL DRIVING