TY - JOUR
TI - Benefits and challenges of variable compression ratio at diesel engines
AU - Pešić Radivoje B
AU - Milojević Saša T
AU - Veinović Stevan P
JN - Thermal Science
PY - 2010
VL - 14
IS - 4
SP - 1063
EP - 1073
PT - Article
AB - 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.