Basics of Fuel Consumption and Exhaust Gas Emissions - Decreasing Fuel Consumption and Exhaust Gas Emissions in Transportation - page 8

Environmental
parameters

Not linear combination
of impact factors

I P H W W

Questions:
Are there relevant ranges
of daily journey applicable
to NEDC conditions?
Is conversion of real fuel
consumption and emissions
to conditions at the test
bench possible?
Which time intervals are
representative for NEDC?
Combination of data by ANN
in the high capacity micro
controller on-board is
successful or not?

Driving parameters,
flying parameters,
shipping parameters

v d g rpm

Measuring results of
emission and fuel consump-
tion relevant factors
Iteration for comparison of fuel and
emission relevant parameters of a real
journey with test bench conditions
Estimation of impact of
deteriations related to NEDC
measuring results

reality

NEDC

T temperature W wind power

wind direction

d vehicle direction

P pressure

W

g gear

H humidity v vehicle speed rpm number of revolutions

Fig. 1.6 Comparison of operation emissions to test bench emissions with the Artificial Neuronal
Network (ANN)

1.4 Conversion of Real Operation Emissions
to Test Bench Emissions

The key problem of Self Diagnosis is the conversion of real operation emissions to
test bench emissions. In practice, environmental conditions are very variable and
must be related to the nominal conditions at the test bench [ 15 ]. A possible
conversion can be obtained through the use of mathematical methods on-board, if
future micro controller technology has very high operation speed and storage
capacity (see Fig. 1.6 ).
Similarly to the sensor technology, recent on-board micro controller systems
are only partly able to fulfill all of these high quality conditions. Besides hardware
also new, on-board software systems are needed to transfer and compare real data
with stored data [ 16 ].

1.5 Specific Characteristics of Vehicles', Airplanes'
and Ships' Emissions

Experiences show that only a few time intervals of real drive, flight, and ship
navigation can be compared with original phases.