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Improvement of Carburetion and Combustion in the Two-Stroke Otto Engine With Fuel Injection
Technical Paper
785059
Sector:
Language:
German
Abstract
High concentrations of hydrocarbons in the exhaust of two-stroke
Otto engines offset the advantages of their low CO and NOx
emissions. The largest portion of these CH emissions are a result
of combustion chamber exhaust-processes. The paper describes
efforts to correct this problem.
Tests were run to study experimentally the effects of various
measures; testing procedures limited the number of variables. In
particular, two approaches were pursued. The first, the
modification of the geometry of the combustion chamber, resulted in
a remarkable lowering of CH emissions; this was attributed to a
partial charge-stratification and accompanying reduction in
charge-formation time, achieved through the configuration of
injection components. The second approach involved incorporation of
direct fuel injection into the engine, and these initial efforts
concentrated on overcoming irregularities in operation. On the
basis of these results, it is believed that very large reductions
of the CH emissions are achievable.