Academic Journals Database
Disseminating quality controlled scientific knowledge

BENEFITS AND CHALLENGES OF VARIABLE COMPRESSION RATIO AT DIESEL ENGINES

ADD TO MY LIST
 
Author(s): Radivoje B Pešić | Saša T Milojević | Stevan P Veinović

Journal: Thermal Science
ISSN 0354-9836

Volume: 14;
Issue: 4;
Start page: 1063;
Date: 2010;
Original page

Keywords: diesel engine | efficiency | emission | variable compression ratio | working process

ABSTRACT
The compression ratio strongly affects the working process and provides an exceptional degree of control over engine performance. In conventional internal combustion engines, the compression ratio is fixed and their performance is therefore a compromise between conflicting requirements. One fundamental problem is that drive units in the vehicles must successfully operate at variable speeds and loads and in different ambient conditions. If a diesel engine has a fixed compression ratio, a minimal value must be chosen that can achieve a reliable self-ignition when starting the engine in cold start conditions. In diesel engines, variable compression ratio provides control of peak cylinder pressure, improves cold start ability and low load operation, enabling the multi-fuel capability, increase of fuel economy and reduction of emissions. This paper contains both theoretical and experimental investigation of the impact that automatic variable compression ratios has on working process parameters in experimental diesel engine. Alternative methods of implementing variable compression ratio are illustrated and critically examined.
Why do you need a reservation system?      Save time & money - Smart Internet Solutions