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What is?
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.
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Advantages: [123 ]
* 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.
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Disadvantages:
· Ignition system is more complex than diesel.
· reliability than diesel difference.
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Principle:
kinetic energy generated by the combustion of gasoline in cylinder to drive the toggle mechanism connected to the piston, around the crankshaft and the output power reciprocating circular motion.
is a four-stroke engine intake, compression, power, exhaust four stroke (stroke) composition.
of the intake stroke
The piston is a crankshaft driven by the upper 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 is moved 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. Driven by the crankshaft under the action of the rotating flywheel 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.
power stroke
At this time, 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 the gas pushes the piston moves downward, through the connecting rod rotates the crankshaft. In the four stroke engine, only this was achieved at the stroke of thermal energy into mechanical energy.
exhaust stroke
exhaust valve is opened, the piston moves from the bottom dead center to the top dead center, the exhaust gas with the piston upward, the cylinder is discharged. Resistance to 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. Then, relying on the inertia of the flywheel crankshaft rotation continues to rotateTo begin the next cycle. Again and again, the engine will keep running.
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Further reading:
in 1885 Karl Benz created the world’s first car, and in 1886 automobile manufacturing patent was awarded on January 29, this day is recognized as the world’s first car birthday.