Current through Register 2024 Notice Reg. No. 38, September 20, 2024
(a) Calculation of Emissions Reduction. The
emissions reduction verified for a diesel emission control strategy is based on
the average of all valid test results before (baseline) and after (control)
implementation of the diesel emission control strategy. Test results from both
emission testing and durability testing are to be used. If the applicant
chooses to perform either the initial or the final durability baseline test,
but not both, it must use those results to calculate the reductions obtained in
both the initial and final control tests.
(1)
Percentage Reduction. The percentage reduction for a given pair of baseline and
control test sets (where a "set" consists of all test cycle repetitions, e.g.,
the test set of 3 hot-start UDDS tests) is the difference between the average
baseline and average control emissions divided by the average baseline
emissions, multiplied by 100 percent. The average of all such reductions, as
shown in the equation below, is used in the verification of a diesel emission
control strategy.
Click
here to view image
Where:
| [SUMMATION]= | sum over all control test
sets |
| baselineAVG or
controlAVG= | average of emissions from all
baseline or control test repetitions within a given set |
(A) For any
test set involving cold and hot starts, the time weighted emission result is to
be calculated by weighting the cold-start emissions by one-seventh (
1/7) and the
hot-start emissions by six-sevenths (
6/7) as shown
below.
Weighted Emission
Result=1/7 * average
cold-start emissions + 6/7* average hot-start
emissions
(B) For applicants
that request verification of NOx reductions from on-road applications and
submit additional test data pursuant to section
2703(e)(1)(C),
weighted test results from the additional test set are included in the
percentage reduction equation above. The Executive Officer shall determine an
appropriate weighting factor in consultation with the applicant based on
factors including, but not limited to, the amount of time that vehicles within
the selected emission control group have elevated NOx emissions and the breadth
of engines and applications encompassed by the emission control
group.
(2) The absolute
emission level is the average control emission level, as defined in the
following equation:
Click
here to view image
(b) Categorization of the Diesel Emission
Control Strategy. The Executive Officer shall categorize diesel emission
control strategies to reduce PM and NOx emissions based on their verified
emission reductions according to Table 1 in section
2702. For a diesel emission
control strategy to be verified at a given Level or Mark, the emission
reductions demonstrated by each test set submitted with the application must be
greater than or equal to the minimum reduction that defines the Level or Mark.
It is not sufficient for the average reduction to exceed the minimum value of
the Level or Mark if one of the reductions in the average is below the minimum.
(1) Diesel emission control strategies are
categorized by their PM reductions as follows:
(A) Level zero: the system has been
demonstrated under these procedures to reduce PM emissions by less than 25
percent from the baseline emission level and to reduce NOx emissions by at
least 25 percent from the baseline emission level.
(B) Level one: the system has been
demonstrated under these procedures to reduce PM emissions by at least 25
percent from the baseline emission level.
(C) Level two: the system has been
demonstrated under these procedures to reduce PM emissions by at least 50
percent from the baseline emission level.
(D) Level three: the system has been
demonstrated under these procedures to reduce PM emissions by at least 85
percent from the baseline emission level, or to achieve PM emission levels of
0.01 grams per brake-horsepower-hour (g/bhp-hr) or less.
(2) Diesel emission control strategies are
categorized by their NOx reductions as follows:
(A) Mark 1: the system has been demonstrated
under these procedures to reduce NOx emissions by at least 25 percent from the
baseline emission level.
(B) Mark
2: the system has been demonstrated under these procedures to reduce NOx
emissions by at least 40 percent from the baseline emission level.
(C) Mark 3: the system has been demonstrated
under these procedures to reduce NOx emissions by at least 55 percent from the
baseline emission level.
(D) Mark
4: the system has been demonstrated under these procedures to reduce NOx
emissions by at least 70 percent from the baseline emission level.
(E) Mark 5: the system has been demonstrated
under these procedures to reduce NOx emissions by at least 85 percent from the
baseline emission level.
1. New section
filed 5-12-2003; operative 6-11-2003 (Register 2003, No. 20).
2.
Amendment filed 1-20-2009; operative 2-19-2009 (Register 2009, No.
4).
3. Amendment of section and NOTE filed 8-15-2013; operative
10-1-2013 (Register 2013, No. 33).
Note: Authority cited: Sections
39002,
39003,
39500,
39600,
39601,
39650-
39675,
40000,
43000,
43000.5,
43011,
43013,
43018,
43105,
43600,
43700
and
43830.8,
Health and Safety Code. Reference: Sections
39650-
39675,
43000,
43009.5,
43013,
43018,
43101,
43104,
43105,
43106,
43107
and
43204-
43205.5,
Health and Safety Code; and Title 17 California Code of Regulations Section
93000.
