Investigations on premixed charge compression ignition (PCCI) engines: A review

Abstract

To resolve the problems of high emissions in CI engines, new combustion concepts have been recently developed. Premixed charge compression ignition (PCCI) combustion is a good example. It’s a strategy in which early injection is used causing a burning process in which the fuel burns in the premixed condition. In CI engines, PM and NOX emissions are an extremely unsolved issue. PCCI is the promising solutions that combine the advantages of SI and CI modes of combustion. PCCI engine gives thermal efficiency close to the CI engines and resolves the problems of high NOx and PM simultaneously. Premixing of air and fuel preparation is the challenging part to achieve PCCI combustion. External mixture formation technique has been used to form premixed charge and for this purpose diesel vaporizer is device used to form diesel vapors. Low diesel fuel vapor volatility may be the obstacle in preparing premixed air–fuel mixture. Exhaust gas recirculation (EGR) can be used to control in-cylinder combustion temperature and the rate of heat release. The objective of this study is to improve thermal efficiency and reducing combustion noise and exhaust emission levels.