The effect of variable compression ratio (VCR) on the performance parameters of a gasoline engine

Abstract

The compression ratio of an internal combustion engine is an important control parameter for effective engine design. A project study to simulate the effect of variable compression ratio on the performance of an engine. In this project the various performance parameters were studied at various compression ratios. The study carried out using a simulation software Diesel RK version 4.3.0.189 it is internal combustion engine simulation software, and ECM titanium mapping software version 1.61, to get the engine maps from the control unit file for Volkswagen Golf 2.0 TFSI and engine control module number (1K0907115K). The performance parameters considered for the simulation are Brake Torque, Engine power, indicated mean effective pressure (IMEP), Brake mean effective pressure (BMEP), Specific fuel consumption (SFC), Cylinder Pressure and Cylinder Temperature. The graphs for these parameters against the engine speed at different compression ratios. An increase in compression ratio cause increases in Indicated mean effective pressure (IMEP), Brake mean effective pressure (BMEP), Brake torque, piston engine power, cylinder pressure and cylinder temperature and reduction in the specific fuel consumption