TAILIEUCHUNG - Carbon Materials for Advanced Technologies Part 9

Tham khảo tài liệu 'carbon materials for advanced technologies part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 260 test procedure point length CM Fig. 20. Effect of canister volume on thrcc-day test sequence Purge volume effects The comparison made in Section demonstrates the important effect the amount of purge has on the performance of the carbon canister in terms of limiting the amount of HC release. This effect is also shown in the data presented in Fig. 21. In this example the vehicle has been subjected to the same test cycle sequence as before but in this case two different levels of purging are examined. Also a two liter canister is used on the vehicle for the testing at both purge levels in order to see the effect of purge level on a single canister volume. The two purge levels used in this example are 150 BV 300 liters and a higher level of 200 BV 400 liters . As shown in Fig. 21 the higher purge volume eliminates the increase in the amount of HC adsorbed during the run loss portion of the test and as a result allows the overall loading of the carbon bed to be significantly lowered before the start of the diurnal sequence. This effect is critical as is shown in the amount of HC released during the test cycle. At the 150 BV purge level the HC release on Day 3 grams is above the allowable gram level while there are no HC emissions from the 200 BV purge run that are above 261 the allowable levels. Thus the higher purge volume allows the vehicle to perform as requứed with the two liter canister and no additional carbon canister volume is needed to meet acceptable HC emission levels. fuel system vapor mass adsorbed on generated carbon bed HC released from carbon bed Fig. 21. Effect of purge volume on three-day test sequence mass distribution along carbon bed length CM Return vs. return-less fuel systems A key parameter in the generation of fuel vapor is the temperature level reached in the fuel tank during vehicle operation. As the temperature approaches the top of the fuel distillation curve a sizable increase in vapor generation will occur which .

TỪ KHÓA LIÊN QUAN
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.