Desenvolvimento de um sistema de ignição por lança-chamas para motor ciclo otto

Abstract

This work aims at the development of a torch ignition system adapted for an Otto Cycle, with the objective of obtaining fuel economy. The use of torch ignition systems may reduce pollutants emission, and specific fuel consumption. Besides those benefits, an engine with a torch ignition system may use a wide variety of fuels, becoming a multifuel engine. The engine used is a commercial flexible, eight valves, four cylinders inline,1.8 dm3. First of all, performance reference data will be determined on the standard engine. In the next step is obtained data about the modified engine, using the torch ignition system. In both cases the results collected will contains information about the performance en engine functioning, and both systems will be compared to each other, toquantify the differences. The torch ignition system presents a single fix geometry of torch cell in each cylinder, being fed with non stratified mixtures, through the engines indirect fuel injection system, while spark advance and injection time being controlled by a re-programmable ECU. The results obtained with the preliminary test with the torch ignition system, without the direct fuel injection, indicates that the torch ignitionsystem works and got a good potential to be developed, needing more testing in different running conditions. It is possible to foresee with these results that the torch ignition system can work with leaner mixtures and smaller spark ignition advance, as a result of the higher turbulence and faster burning speed inside the cylinder.