Is diesel or gasoline better?

The volatilization speed of gasoline is faster than that of diesel, so gasoline can enter the cylinder in the state of mixed gas during the intake stroke, while diesel is not easy to volatilize to form mixed gas, so it can only be directly injected into the cylinder before the start of the power stroke.

The auto-ignition point of diesel oil is lower than that of gasoline, so diesel oil can spontaneously ignite in a cylinder with high temperature and high pressure; If the gasoline engine adopts compression ignition mode, it must have a higher pressure, so as to obtain a higher temperature to ignite. However, because gasoline is volatile, it will absorb a lot of heat when it volatilizes, which increases the difficulty of compression ignition again, so ignition with spark plug is the most suitable way.

The burning speed of gasoline is faster than that of diesel, so it is too fierce to put gasoline in a high temperature and high pressure environment, and the body can't stand the tempering of this gunpowder smell, so the pressure of the cylinder should be reduced. When ignited by spark, the flame in the cylinder spreads and burns in the form of "wave", thus avoiding the impact caused by deflagration; However, in high temperature and high pressure air, diesel oil burns in many places at the same time to form flames, that is, it does work in the form of deflagration (similar to the "knock" of gasoline engines), and its working state is rough. However, due to the slow combustion of diesel, although the combustion began to be intense, the combustion time was still longer than that of gasoline.

Therefore, the gasoline engine changes the throttle opening through the accelerator pedal, controls the amount of mixed gas entering the cylinder, and realizes different power output; The control power output of diesel engine depends entirely on the fuel injection, which is a real throttle. If the throttle valve is cancelled, the engine intake will be more sufficient and the combustion will be more sufficient, which is one of the reasons for the high thermal efficiency of diesel engine.

With the wide application of diesel engines in various fields, diesel engines are increasingly loved by people.