How do diesel generators and gasoline generators differ?

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Most generators on the market today use two types of engines: diesel engines (petrol engines) and gasoline engines (gasoline engines for fuel). To understand the difference between these two generators or the differences between the two types of engines, let us highlight the following differences:
So where are gasoline engines and diesel engines different?

First of all, these two engines have in common the use of liquid fuels, are internal combustion engines and complete tasks in four periods: loading - compression - explode - discharge corresponding to two revolutions of the crankshaft engine.


The basic difference between a gasoline engine and a diesel engine lies in three characteristics: the type of fuel used, the fuel supply system and the fuel type.
Gasoline fueled gasoline engines are characterized by the octane value (anti-knock value), the higher this value, the higher the anti-knock factor.


Currently, there are four types of petrol with different octane values ​​in our country: A95 has 95 octane rating for gasoline engines with a compression ratio above 9.5: 1; The A92 has an octane rating of 92 for engines with a compression ratio of 9.5: 1; The A83 has an 83 octane rating for engines with a compression ratio of 8: 1, but this type of gas is not currently used; The last category is E5 biofuel, a mixture of 5% ethanol A95 gasoline.


Meanwhile, diesel diesel engines are characterized by cetane value (fire rating) and in the market today the commonly used type is DO 0.5% S. The different characteristics of gasoline and diesel that fuel systems of the two types of engines differ fundamentally.
The petrol engine's fuel supply system is a combustion mixture (including gasoline and air) on the intake manifold (including carburetor and electronic fuel injection). Directly to the air right in the cylinder. However, on newer generation vehicles (such as the new Ford Focus), the direct injection system (GDI) has the same basic principle as diesel engines.


At the gasoline engine, the combustion mixture is introduced into the engine to perform the compression stroke and is detonated by the spark ignition for combustion, expansion and work. Due to such characteristics, the gasoline engine has an additional ignition system. For diesel engines, after injection the fuel injected at high speed and pressure combined with the vortex chamber on the top of the piston produces the combustion mixture. The mixture is compressed with high compression ratio and self-igniting, expanding and producing.


In the same vehicle of a manufacturer, if there are two choices of gasoline and diesel engines with equivalent cylinder capacity, each has its own advantages. Gasoline engines often achieve faster turnaround times and larger capacity, thus accelerating better. On the other hand, diesel engines generally have a lower number of revolutions, with lower acceleration than gasoline engines, but with higher torque, which results in lower traction at lower rpm.
The performance of the diesel engine is about 1.5 times larger than that of a gasoline engine. Diesel fuel is generally cheaper than gasoline, 1 liter of diesel when fully burned gets about 8,55 calories while 1 liter of gasoline burns completely for about 8,140 calories. The fuel consumption of the diesel engine is 200-285g / kWh smaller than the gasoline engine's 260-380g / kWh.


However, in addition to the above advantages, diesel engines have some limitations compared to gasoline engines: If you compare two types of gasoline and diesel engines with the same capacity, the diesel engine weight is greater than the gasoline engine. The High-Diesel fuel injection material and technology require higher fuel consumption, so diesel engines are more expensive than gasoline engines; lower speed diesel engine than gasoline engine; The high noise and exhaust gas of the diesel engine contains more carbon black than the gasoline engine.


In the future, in the luxury car, the use of gasoline engine is mainly due to the superiority is the engine smooth operation, great acceleration. Research to improve fuel efficiency and efficiency on gasoline engines is increasingly being completed such as direct injection gasoline (GDI) system, multiple ignition system, intelligent air distribution mechanism. In addition, a trend is also developing quite strong is the use of hybrid engines.
Diesel engines, with their outstanding advantages, are large traction, especially engine components with longevity and durability, so diesel engines are always targeted by scientists to overcome the dangers. processing.


The main research directions for completing the diesel engine focus on increasing power, increasing the maximum number of revolutions and reducing vibration. To achieve this goal, experts put turbocharger systems in place to increase the pressure and air volume in the combustion chamber, thereby increasing the engine's capacity. On the other hand, the Common Rail (CDI) system (as on the Mercedes GLK or Mitsubishi Triton) is capable of completing the electronic injection process and increasing the injection pressure will help make the combustion process more complete.