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FTP emissions

L. S. Socha, J. P. Day, and E. M. Barnett, Impact of Catalytic Support Design Parameters on FTP Emissions, SAE 892041, Society of Automotive Engineers, Warrendale, Pa., 1989. [Pg.495]

Sixteen combinations of converter size and catalyst composition (four catalysts in each of four converter volumes) were evaluated. A fresh charge of catalyst was placed in each converter, and the converter was then installed on the vehicle. Three repeat 1975 FTP emission tests were run with no other mileage accumulation on the catalyst. Test results were then averaged, the average representing the zero-miles activity of the catalyst for that converter size. [Pg.81]

FTP Emissions. The overall system performance during the 1975 FTP tests for HC and CO emissions as a function of catalytic converter volume is plotted in Figures 1 and 2 respectively. Emissions are expressed in g/mile of vehicle operation with the cold start, hot stabilized, and hot cycle emissions weighted as prescribed (3). There was a distinct difference in the performance of the base metal and platinum catalysts with decreasing converter volume. Both HC and CO emissions with base metal catalysts increased monotonically as converter volume was decreased. In contrast, when platinum catalysts were used, both HC and CO emissions decreased to a minimum at 1300 cm3 and then increased at the smallest volume. [Pg.82]

Warm-Up Performance. 1975 FTP emissions are strongly affected by vehicle emissions during warm-up, particularly when catalyst systems are used to control emissions. The effect of catalyst volume, and thus the thermal mass of the converter, on warm-up temperatures is depicted in Figures 3 and 4 for the GMR Pt and Cu-Cr catalysts respectively. [Pg.82]

Conversion efficiencies relative to the base line vehicle emissions are tabulated in Table VI. In general, the response of both types of catalyst to decreasing converter volume was similar to that for the 1975 FTP emissions. Both HC and CO emissions continually increased as base metal catalyst volumes were decreased. HC emissions were relatively constant for platinum catalyst volumes greater than 1300 cm3. CO conversions of 97-98% were produced by all combinations of platinum catalyst and converter volume. [Pg.85]

Thermal Effects. As expected, the smaller converter volumes warmed up more rapidly because of their smaller thermal mass (Figures 3 and 4). With the platinum catalysts, the conversion efficiencies achieved during the first five cycles of vehicle operation agreed generally with the 1975 FTP emission trends. A minimum in the emissions (Figures 1 and 2) and a corresponding maximum in the warm-up conversions (Table V) occurred at a converter volume of 1300 cm3. [Pg.88]

The effect of aging on FTP emissions was measured using exhaust configuration 2 (see Figure 10) with the 350 ceramic preconverter and 400 Sa metallic preconverter. The NMHC, CO and NO emissions output from each of these preconverters are compared as function of their... [Pg.319]

Figure 17. Comparison of FTP emissions from 350 Q ceramic vs. 400 metallic preconverter alone as... Figure 17. Comparison of FTP emissions from 350 Q ceramic vs. 400 metallic preconverter alone as...
The FTP emissions test demonstrated that the 350 ceramic preconverter outperformed the 400 SS metallic preconverter of identical volume after both 60 and 120 hours of aging in exhaust configurations 2 and 3. The average shell temperature for ceramic preconverter is 200°C lower than that of the mantle for metallic preconverter indicating that the former retains more exothermic heat due to mat insulation and promotes early light-off of the main converter. The metallic preconverter radiates heat to surrounding environment and is less effective in transmitting exothermic heat to the main converter. [Pg.322]

Table 3Catalyst "C - U.S. HD Transient (FTP) Emissions Test Results... Table 3Catalyst "C - U.S. HD Transient (FTP) Emissions Test Results...

See other pages where FTP emissions is mentioned: [Pg.495]    [Pg.54]    [Pg.463]    [Pg.495]    [Pg.79]    [Pg.313]    [Pg.317]    [Pg.318]    [Pg.319]    [Pg.320]    [Pg.474]    [Pg.474]    [Pg.476]    [Pg.476]    [Pg.477]    [Pg.924]    [Pg.650]    [Pg.120]   
See also in sourсe #XX -- [ Pg.76 ]




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