SISTEMA DE INJEÇÃO ELETRÔNICA DIESEL (COMMON RAIL)

Abstract

This document presents a study on the common rail system for supplying diesel cycle engines. Following the steps of the electronic project that controls the fuel injection in the Otto cycle engines, a feeding system was developed for the diesel cycle engines, in which the times, the quantity and the injection advance are controlled electronically through a command module . This system has a characteristic of operation similar to some injection systems of the Otto cycle, in which the fuel is pressurized and available in a common feeder tube for the injector nozzles. The biggest difference is due to the fuel pressure inside this tube, which can reach peaks of 1800 Bar, obtained through a high pressure mechanical pump. Once pressurized, the fuel will be sprayed in the combustion chamber, causing the mixture to atomize. Fuel injected under high pressure produces less hydrocarbon emissions and soot in the discharge. The engine power is controlled by the command module, which, through information sent by the sensors, defines the best injection management program, so the adoption of this new system includes a new technology that precisely controls the volume, the advance, the time and the number of injections into each combustion chamber of the engine, according to the operating conditions of the load applied to it.