refers to a gasoline engine, a gasoline as fuel, the chemical energy into mechanical energy of the heat engine. After the compressed air-fuel mixture reaches a certain temperature and pressure, the spark plug ignites the gas expansion work.
1. Advantage of a gasoline engine
* under the same power condition, size and quality of gasoline are smaller than diesel.
High speed, preferably starting and accelerating performance.
· low running noise, comfort is good.
2. Disadvantage gasoline engine
– the diesel ignition system complexity.
· reliability than diesel difference.
3. gasoline engine works
is generated by the combustion of gasoline in cylinder kinetic energy to drive the toggle mechanism connected to the piston, a reciprocating circular motion around the crankshaft and the output power.
is a four-stroke engine intake, compression, power, exhaust four stroke (stroke) composition.
of the intake stroke of the piston is driven by the crankshaft by a dead center TDC moved downwardly, while the intake valve opening, exhaust valve closing.
When the piston top dead center from the bottom dead center moves, the volume above the piston increases, the gas pressure in the cylinder drops, a certain degree of vacuum.
Since the intake valve open, the cylinder communicates with the intake pipe, the mixed gas is sucked into the cylinder.
When the piston moves to the bottom dead center, the cylinder is filled with fresh mixture.
the compression stroke of the piston moves from the bottom dead center to top dead center, intake and exhaust valves closed.
crankshaft driven under the influence of flywheel rotation inertia force, by pushing upward movement of the piston rod, the volume of gas in the cylinder is gradually reduced, the gas is compressed, mixed gas pressure and temperature in the cylinder with the increase.
At this time, the power stroke, while closing the intake and exhaust valves, spark ignition, the combustion gas mixture intense, rapid temperature rise in the cylinder pressure, high temperature, high pressure gas pushes the piston moves downward, through the connecting rod rotates the crankshaft.
operation of the engine in fourA trip, this was only achieved at the stroke of heat energy into mechanical energy.
the exhaust stroke the exhaust valve opens, the piston moves from the bottom dead center to the top dead center, the exhaust gas with the piston upward, the cylinder is discharged.
Since the resistance of the exhaust system, and also occupy a certain volume of the combustion chamber, so that the exhaust end, the exhaust gas is not possible to drain, leaving this part is referred to exhaust residual gas.
only affects the intake of residual gas, but also have an adverse effect on the combustion. At the end
of the exhaust stroke, the piston back to the top dead center.
also completed a work cycle.
Subsequently, relying on the crankshaft inertia flywheel continues to rotate the rotation, the next cycle begins.
Again and again, the engine will keep running.
4. Gasoline engine-related reading
In 1885 Karl Benz created the world’s first car, and obtain patent automakers in January 29, 1886, this day is recognized as birth date is the world’s first car.