Experimental study of the reduction of standardized harmful emissions from exhaust gases of inflatable gasoline engines with direct fuel injection

Abstract

Reduction of standardized harmful emissions from exhaust gases of internal combustion engines (ICE) is one of the directions for the development of automotive engines. But due to ever-tightening toxicity standards, ICE manufacturers have to use more sophisticated systems that directly affect the workflow, which reduces the formation of harmful emissions during the combustion process. However, the development and application of additional more complex systems leads to an increase in the cost of manufacturing and subsequent maintenance of internal combustion engines throughout the entire life cycle.

The purpose of the study is to conduct an experimental study of a gasoline engine with direct fuel injection and the use of a turbocharger to assess the possibility of reducing standardized harmful emissions by increasing the injection pressure and optimizing of the start of fuel injection (SOI).

The tests were carried out on a FEV dyno measuring motor bench designed for testing internal combustion engines with a power of up to 800 kW. The reliability of the data obtained is confirmed by the use of modern measuring equipment and processing of the results. The result of the optimization of the SOI and an increase in the fuel injection pressure of a gasoline internal combustion engine with direct fuel injection and turbocharging was: a decrease in the calculated concentration of suspended particles over the entire range of engine operation conditions by an average of 42%; reduction of hydrocarbon emissions over the entire range of engine operation by an average of 7,7%; emissions of oxides of nitrogen and carbon are slightly dependent on the optimization of the SOI and increasing the injection pressure; there was a decrease in specific effective fuel consumption by 17% at low torque up to 200 Nm and crankshaft speed up
to 4000 min^-1.