Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
INVESTIGATION OF DIRECT ETHANOL INJECTION PRESSURE AND TIMING PARAMETERS ON COMBUSTION, PERFORMANCE AND EMISSION IN PART LOAD OF A SPARK IGNITION ENGINE
Submission Author:
Diego Golke , RS , Brazil
Co-Authors:
Diego Golke, Mario Martins, Thompson Diordinis Metzka Lanzanova, Geovane Alberto Frizzo Prante, Marcelo Rohrig, Roberto Garlet
Presenter: Diego Golke
doi://10.26678/ABCM.ENCIT2020.CIT20-0506
Abstract
Over the past decades, internal combustion engines (ICEs) have struggled with ever stringent emission legislation. Nowadays, the downsizing concept is becoming largely employed in spark ignition engines due to increased engine efficiency. However, the presence of turbocharging and direct fuel injection system makes the strategies of engine management for drivability more complex and needs further investigation with the specifics of the Brazilian market, in which hydrous ethanol is widely available. Hence, this work intends to study the effects on emissions and combustion performance parameters by varying direct injection timing and pressure at part load of a three-cylinder 1.0 L turbocharged engine. The engine was fueled with hydrous ethanol, which is expected have increased usage in Brazil. The tests were carried out at 2 and 8 bar IMEP, 1500 rpm and stoichiometric condition. The spark timing was adjusted to maintain CA50 in 10 CAD ATDCf and the positive valve overlap was of 20 CAD symmetrical at TDC. The injection pressure and injection timing were swept from 60 to 140 bar and 0 to 120 CAD ATDCi respectively. The results showed in part load an optimum injection timing at 30 CAD ATDCi. The injection pressure effect showed more influence in late injection, improving engine stability and emissions.
Keywords
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