What are the disadvantages of diesel vehicles?

With the increasing demand for car purchase, there are more and more choices of car models. Many friends like to buy off-road vehicles, but many off-road vehicles have two versions of gasoline and diesel. Choosing the gasoline version or the diesel version has become a difficult problem for everyone.

Before talking about the disadvantages, let's talk about the advantages of diesel vehicles.

Diesel engine has high compression ratio, high thermal efficiency, good fuel economy and fuel economy; Especially at medium and low speeds, the fuel-saving advantage is more obvious.

High torque at low speed and strong starting acceleration ability.

Diesel vehicles are more reliable, and this advantage is not obvious.

disadvantaged

First, the power of diesel vehicles is relatively small, which means that the maximum speed of diesel engines is different from that of gasoline vehicles with displacement. The diffusion combustion mode of diesel engine limits the maximum speed of diesel engine. We know that the power of the engine is directly proportional to the rotational speed, and the maximum rotational speed is much lower than that of the gasoline engine, so the maximum power is small and the rising power is small.

Second, the diesel engine is noisier, and the disadvantage that the diesel engine is noisier than the gasoline engine is undeniable.

Third, diesel oil is more likely to freeze at low temperature and can't catch fire, which may be a common situation for car owners in the north. Even if there is a diesel preheater, it is not recommended to buy it in too cold areas, and people and cars will suffer. The specific mass is the mass of materials used for engine output 1 kW power; The specific mass of automobile gasoline engine is1-2.5 kg/kw; The specific mass of diesel engine for automobile is 4-6 kg/kW; It means that the output of the same power, the weight of diesel engine is 2 to 3 times that of gasoline engine.

The domestic road environment makes the diesel engine fail. As we know, in Europe, the road environment is mostly mountain roads, which are rugged and often need to climb. However, most of China are plains, and most of them are blocked on the road, so there is no way to enjoy the characteristics of diesel engine fuel saving and sufficient torque platform.

The quality of domestic diesel oil lags far behind that of foreign countries. Diesel engines do work on compression ignition diesel, so the requirements for fuel injectors are very high, and the pressure and accuracy of fuel injected by fuel injectors must meet the requirements of compression ignition. Therefore, from this perspective, diesel engines have very high quality requirements for diesel. If the quality of diesel oil is not up to standard and there are too many impurities, the fuel nozzle will be blocked. Once the nozzle is blocked, the diesel engine will not work normally.