Requires licenses and certifications.
1. The gasoline generator is assembled by connecting and assembling the stator and rotor of the generator with bearings and end covers, so that the rotor can rotate in the stator and carry out the cutting movement of the magnetic lines of force, thus generating an induced electrical potential, which passes through the terminals. When removed and connected in the loop, a current is generated.
2. Principle of gasoline generator
The engine is a machine that converts chemical energy into mechanical energy. Its conversion process is actually the work cycle process. through combustion, the fuel in the cylinder generates kinetic energy and drives the piston in the engine cylinder to reciprocate, which causes the connecting rod connected to the piston and the crank connected to the connecting rod to reciprocate in a circular motion around the center of the citybrequin. output power.
3. Let's analyze this process:
A work cycle includes four piston strokes (piston stroke refers to the distance between the piston from top dead center to bottom dead center. process): intake stroke, compression stroke, expansion stroke (power stroke) and exhaust stroke.
4. Intake Stroke
During this process, the intake valve of the engine opens and the exhaust valve closes. As the piston moves from top dead center to bottom dead center, the volume of the cylinder above the piston increases, causing the pressure in the cylinder to drop below atmospheric pressure, i.e. creating a vacuum suction in the cylinder, so that air passes through the intake pipe and inlet. The valve is sucked into the cylinder, and at the same time the fuel injector sprays atomized gasoline to mix thoroughly with the air. At theAt the end of air intake, the gas pressure in the cylinder is approximately 0.075 to 0.09 MPa. At this point, the temperature of the combustible mixture in the cylinder has increased to 370-400K.
5. Compression stroke
In order to allow the combustible mixture drawn into the cylinder to burn quickly to generate greater pressure, so that the engine can put out greater power, it must be compressed. before combustion. The combustible mixture is compressed to reduce its volume, increase its density and increase its temperature, which requires a compression process. During this process, the intake and exhaust valves are closed and the crankshaft pushes the piston to move one stroke from bottom dead center to top dead center, which is the compression stroke. At this time, the pressure of the mixed gas will increase to 0.6-1.2MPa and the temperature can reach 600-700K.
There is a very important concept in this tripge, which is the compression ratio. The compression ratio is the ratio between the maximum volume of gas in the cylinder before compression and the minimum volume after compression. Generally, the higher the compression ratio, the higher the pressure and temperature of the mixture at the end of compression, and the faster the combustion rate. Therefore, the more power generated by the engine, the better the economy. The compression ratio of ordinary cars is between 8 and 10, but the latest Polo on the market has achieved a high compression ratio of 10.5, so its torque performance is relatively good. However, when the compression ratio is too high, not only cannot the combustion situation be further improved, but abnormal combustion phenomena such as flash ignition and shallow ignition will occur.
Flash combustion is abnormal combustion caused by combustionspontaneous combustion of the final combustible mixture away from the center of ignition in the combustion chamber due to excessive gas pressure and temperature. During the burst, the flame propagates outward at an extremely high speed, and before the gas even has time to expand, the temperature and pressure rise sharply, forming a pressure wave that propels itself outward. forward at the speed of sound. When this pressure wave hits the combustion chamber wall, a high-pitched knocking noise is emitted. At the same time, it will also lead to a series of adverse consequences such as engine overheating, power reduction and increased fuel consumption. Severe deflagration can even cause burnt valve, bearing rupture, spark plug insulator rupture and other mechanical damage phenomena.