Effect of the composition of mixed gasoline on energy indicators and fuel economy of vehicles with different engine power systems

Abstract

The work presents the results of theoretical and experimental research of the influence of gasoline with a high alcohol content on the performance of engines and vehicles with different fuel systems.
The main attention is paid to the use of this gasoline in vehicles with a carburetor fuel system. In the research has shown the changes main performance vehicle indicators, such as fuel efficiency indicators.
As a result of experimental studies, it was found that with constant regulation of the carburetor, the increase in the content of alcohol in gasoline to 36% leads to a significant depletion of fuel and air mixture, passage of working cycles, the growth of concentrations of unburned hydrocarbons and lower engine power. To improve the performance of the vehicles with a carburetor fuel system engines for work on gasoline with a significant addition of alcohol compounds, it is proposed to change the regulation of the fuel system towards the enrichment of fuel and air mixture by increasing the throughput of fuel jets. With the corresponding adjustment of the fuel system with an increase in the content of alcohol in gasoline, the engine runs stably without the passes of working cycles. Insignificantly, the maximum engine power decreases and fuel consumption increases, which can be explained by the depletion of the fuel mixture with an increase in the content of alcohol in gasoline.
Polynomial dependences of engine performance on the concentration of alcohol compounds, torque, and engine speed were obtained. They allow the engine to be described as a source of energy, fuel, air and environmental pollutant in load and idle modes, which is necessary to calculate the performance of vehicles in motion according to the Modified European Driving Cycle.Shown the chassis dynamometer test results of ZAZ-1102.
Key words: bioethanol, alcohol compounds, gasoline engine, fuel efficiency, chassis dyno tests.