Document ID: EPA-HQ-OAR-2003-0012-0934
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2004-04-15T04:00Z

1
Justifications
supporting
the
Council
proposal
in
front
of
the
amendments
of
directive
97/
68/
EC
following
the
Environment
Committee
voting
on
09/
09/
2003.

22/
09/
2003
The
Parliament
Environment
Committee
report
amendments
are
grouped
by
main
subject.
Justifications,
here
discussed,
refer
to
the
EP
amendments
which
are
not
accepted
or,
if
accepted,
they
require
a
different
formulation.

NOTE:
This
version
of
this
document
has
been
reduced
only
to
the
issue
of
the
ambient
temperature
at
which
the
transient
test
cycle
is
carried
out.
14.4.2004.

1.
Stage
IV
NOx+
THC
standards
for
general
NRMM
application
Parliament
amendments
N.
13,
22,
26,
31,
35.

Omissis
2.
Defeat
device
and
irrational
emission
control
strategy
Parliament
amendments
N.
5,
20,
29,
30.

Omissis
3.
Inland
waterway
vessels
Parliament
amendments
N.
12,
14,
15,
18,
25,
36.

Omissis
4.
Rail
Traction
Engines.
Parliament
amendments
N.
12,
16,
17,
18,
23,
24,
27,
28,
32,
38.

Omissis
5.
Limit
values
not
to
be
exceeded
under
selected
load
conditions
Parliament
amendments
N.
4,
33,
37.

Omissis
6.
Transient
test
of
the
engine
at
ambient
temperature
Parliament
amendments
N.
3,
40,
41.
2
Amendment
N.
40
can
be
accepted,
but
with
a
different
ratio
of
cold/
hot
phases
of
the
transient
cycle.
If
we
assume
a
first
starting
of
the
engine
at
ambient
temperature
(
corresponding
to
the
cold
start
phase
of
the
nonroad
transient
cycle
of
about
30
minutes)
and
a
working
day
of
5
hours
(
300
minutes)
the
weight
ratio
between
the
hot
phase
and
the
cold
phase
of
the
cycle
is
300
/
30
=
10/
1,
that
is
exactly
the
figure
adopted
by
the
US
EPA
in
the
NRPM
on
NRMM
of
15/
04/
03.
In
conclusion
the
weight
of
the
cold
start
phase
should
be
1/
10,
while
the
weight
of
the
hot
start
is
9/
10
as
in
US
EPA
NPRM.

Amendment
N.
41,
as
it
is
now
presently
formulated,
means
a
very
expensive
test
with
two
days
to
execute
10
in
total
cold
/
hot
cycles,
taking
into
account
that
for
a
medium­
size
engine
(
power
band
between
130
 
560
kW)
it
takes
at
least
8
hours
for
the
natural
(
i.
e.
without
any
external
induced
cool­
down
operations
according
to
a
well­
defined
procedure)
engine
cooling.
Furthermore,
no
definition
is
given
about
what
is
intended
as
ambient
temperature
and
the
related
procedure
to
perform
the
engine
type
approval
test.

Another
approach,
typical
of
the
US
on­
highway
test
procedure
that
will
be
applied
also
to
Tier
4
NRMM
engines,
has
to
be
undertaken:
The
transient
test
cycle
would
be
run
twice.
The
first
time
would
be
after
the
engine
had
soaked
to
room
temperature
and
the
engine
coolant
and
oil
temperatures,
aftertreatment
systems
and
all
auxiliary
engine
control
devices
were
stabilized
between
20
and
30
°
C.
This
is
known
as
cold
start.
The
second
time
would
be
after
a
twenty
minute
hot
soak
that
would
commence
after
the
completion
of
the
cold
start
cycle.
Specific
emissions
(
g/
kWh)
would
be
measured
during
both
the
cold
and
hot
start
cycles.
Composite
weighted
emissions
would
be
then
computed
by
weighing
the
cold
start
results
10%
and
the
hot
start
results
90%.
Weighted
composite
results
would
need
to
meet
the
standards.