(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.
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(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:
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Image 2 (2.83" X .29") Available for Offline Print
(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.
Notes
Cal. Code Regs. Tit.
13, §
2708
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.
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).
