Characteristics of Unburned Hydrocarbon Emissions in a Low Compression Ratio DI Diesel Engine Hokkaido University

Format:

Book

Conference/Event

Author/Creator:

Ogawa, Hideyuki, author.

Conference Name:

SAE World Congress & Exhibition (2009-04-20 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2009

Summary:

In a DI diesel engine, THC emissions increase significantly with lower compression ratios, a low coolant temperature, or during the transient state. During the transient after a load increase, THC emissions are increased significantly to very high concentrations from just after the start of the load increase until around the 10th cycle, then rapidly decreased until the 20th cycle, before gradually decreasing to a steady state value after 1000 cycles. In the fully-warmed steady state operation with a compression ratio of 16 and diesel fuel, THC is reasonably low, but THC increases with lower coolant temperatures or during the transient period just after increasing the load. This THC increase is due to the formation of over-lean mixture with the longer ignition delay and also due to the fuel adhering to the combustion chamber walls. A low distillation temperature fuel such as normal heptane can eliminate the THC increase. Benzene, 1,3-butadiene, and other unregulated harmful emissions also increase under the high THC conditions

Notes:

Vendor supplied data

Publisher Number:

2009-01-1526

Access Restriction:

Restricted for use by site license