CONTROLLING COMBUSTION IN HCCI DIESEL ENGINES

Abstract

HCCI is an alternative piston-engine combustion process that can provide efficiencies as high as compression-ignition, direct-injection (CIDI) engines (an advanced version of the commonly known diesel engine) while, unlike CIDI engines, producing ultra-low oxides of nitrogen (NOx) and particulate matter (PM) emissions. HCCI engines operate on the principle of having a dilute, premixed charge that reacts and burns volumetrically throughout the cylinder as it is compressed by the piston. In some regards, HCCI incorporates the best features of both spark ignition (SI) and compression ignition (CI), In the high speed direct injection Diesel engines the ignition delay is a critical parameter for controlling air-fuel mixing and combustion processes. In this paper are presented the theoretically and experimentally results of the studies develops in Automotive and Engines Department of University TRANSILVANIA Braşov for design of a new pilot injection system that makes possible the control of Homogeneous Charge Compression Ignition in a conventional D. I. Diesel engines, with application in design and manufacture of Diesel engines for truck.