Gasoline engine because fuel viscosity is small, gasoline generator fast evaporation, therefore the air right out of the cylinder can form a uniform mixture, and therefore the mixture sucked through the cylinder, fuel injection system or fuel injected to the cylinder, the gas expansion work done. In the first place of 1886 the original car, the gasoline engine in a vehicle, especially about the extensive by using small cars, doesn't have changed.
The disadvantage of gasoline is gloomier when compared to the thermal efficiency of diesel engines, fuel consumption as compared to the engine ignition system complexity, reliability and simple maintenance isn't as diesel engines. [1] gasoline engine works: a working cycle includes four piston stroke (so-called piston stroke means the piston from TDC to BDC the gap involving the process): the intake stroke, compression stroke, expansion stroke ( power stroke) and therefore the exhaust stroke.
 Gasoline engine compression stroke

To sucked in the cylinder of this combustible mixture can rapidly burn in an attempt to have a very good greater pressure, so the larger issue of the engine power, should burning combustible mixture before compression, to relief the degree, density, increased temperature, value of compression. In this particular process, the intake and exhaust valve fully closed, push the piston fire up only via next reveal move go to point that compression stroke. At this moment the mixture pressure increases to 0.6-1.2MPa, temperature a lot 600-700K.

With this trip there is also a valuable concept, thats generally, welding machine the compression ratio. The so-called compression ratio, the gas cylinder before compression is definitely the maximum volume and minimum volume compression ratio. Compression ratio is typically greater on the compressed mix of the end of pricey pressure and temperature, the faster the burn, thus the greater the power the engine issue, so much the better the economy. General car in between your compression ratio at the 8-10, the difference is most up to date mailing list Polo reached a high 10.5 compression ratio, it is therefore relatively good performance of torque. Although the compression ratio sizing large, not only will not further boost the combustion, but are going to be violence and surface ignition fuel combustion, which are not normal phenomenon (the impact of fuel quality happens to be occupies a fairly important position, which let's explain in depth later).
Deflagration can be caused by gas pressure and temperature from the combustion chamber compared distance coming from the center of your end ignited combustible mixture ignition which result from an abnormal combustion. Deflagration into a very good rate while the flame to spread, coupled with situation of increase of the gas within, sharp enhance in temperature and pressure produce a pressure wave, the rate of sound move forward. If this pressure wave hit the combustion chamber wall is truly a sharp knock along the issue of sound. In the mean time, triggers engine overheating, power down, fuel consumption increases and also a mixture of adverse consequences. Severe storms could potentially cause burning or burned valves, broken bearings, spark plug insulators in addition to parts damaged by breakdown phenomena.
Gasoline engine fuel and in addition violence, high compression ratio engines can also face another issue: the finish ignition. Because of the tank to the hot surface and hot (including exhaust valve head, spark plug electrodes, carbon deposition at) ignite lots of people given by another abnormal combustion (referred to as hot as small as ignition or fuel). Surface ignition occurs, may also be utilizing a strong Knocking sound (more boring), gasoline engine the resulting high pressure causes the engine load increases, shortened shelf-life.