New Mixture Formation Technology of Direct Fuel Injection Stratified Combustion SI Engine (OSKA)

871689

09/01/1987

Event
1987 SAE International Off-Highway and Powerplant Congress and Exposition
Authors Abstract
Content
A new type of internal combustion engine has been developed. The new idea incorporates an impinging part in the central piston cavity. The fuel spray is injected against the impinging area, spreads and forms a fuel mixture. Since a comparatively rich fuel mixture always stays around the impinging part and ignition is acomplished at the center of the rich fuel mixture, steady, instantaneous and high-speed combustion is possible. As the fuel mixture is always formed in the cavity, there is little fuel in the squish area. Therefore, it is possible to prevent end-gas knocking, and in spite of the use of spark ignition, to operate the engine at higher compression ratio than a conventional premixed SI engine.
Experiments with methanol fuel showed that BMEP was 1.1MPa and the maximum brake thermal efficiency was 42%. The combustion noise was lower than that of diesel engine.
Brief tests with gasoline showed a maximum brake thermal effiency of 36%.
Meta TagsDetails
DOI
https://doi.org/10.4271/871689
Pages
12
Citation
Kato, S., and Onishi, S., "New Mixture Formation Technology of Direct Fuel Injection Stratified Combustion SI Engine (OSKA)," SAE Technical Paper 871689, 1987, https://doi.org/10.4271/871689.
Additional Details
Publisher
Published
Sep 1, 1987
Product Code
871689
Content Type
Technical Paper
Language
English