An internal-combustion engine for an automobile engine
Four stroke gasoline engine is air and gasoline in a certain proportion to be mixed gas well, is drawn into the cylinder during the intake stroke, compression ignition combustion gas mixture through the generated heat, high temperature and high pressure gas on the top of the piston and push the piston reciprocating linear motion through the connecting rod, crankshaft and flywheel mechanism outputting mechanical energy. A four stroke gasoline engine performs a cycle of work in the intake, compression, stroke, and exhaust strokes.
The compression stroke (compression stroke) compression stroke, intake and exhaust valves are closed at the same time. The piston moves from the lower dead center to the TDC, and the crankshaft rotates 180 degrees. The piston upward, the volume of work gradually reduced, the mixture in cylinder pressure and temperature rising after compression, compression when the pressure reached the end point, PC up to 800 ~ 2 000kPa, temperature 600 ~ 750K
The intake stroke (intake stroke) on the crankshaft piston driven by the TDC to bdc. At this point, the intake valve opens, the exhaust valve closes, and the crankshaft rotates 180 degrees. In the process of moving piston, the cylinder volume increases, the gas pressure in the cylinder decreases from PR to PA, the cylinder to form a certain vacuum, the mixture of air and gasoline through the intake valve is sucked into the cylinder in the cylinder, and further mixed to form a combustible mixture. As the intake system has resistance, the air pressure at the end of the cylinder is less than the atmospheric pressure P0, or pa= (0.80 ~ 0.90) p0. The temperature of the combustible mixture entering the cylinder is increased from 340 to 400K due to the heating of the high temperature parts such as the intake pipe, cylinder wall, piston top, valve and combustion chamber wall, as well as the mixing with residual exhaust gas.
Due to the different characteristics of gasoline and diesel, the gasoline engine and diesel engine differ in their working principle and structure. The working principle of a gasoline engine (gasoline engine)
