What's the difference between a diesel car and a petrol car? Is it good or bad?

Diesel vehicles are more fuel efficient than gasoline vehicles, which is determined by the technical characteristics of the engine. Because the energy conversion rate of compression ignition diesel engine is higher than that of ignition gasoline engine, the energy consumption is 45%-60% of that of gasoline engine, and the price of diesel oil is lower than that of gasoline. Compared with gasoline engines, engines have fewer complicated high-voltage ignition devices and generally have longer service life than gasoline engines, so the fuel economy of diesel engines is better than that of gasoline engines.

At the same time, in terms of safety and environmental protection, diesel engines have outstanding advantages over gasoline engines.

Diesel oil is nonvolatile and has a high ignition point, so it is not easy to be ignited or exploded due to unexpected circumstances; Carbon dioxide emissions are also about 30%-35% lower than gasoline engines, and diesel vehicles have better exhaust emissions than gasoline vehicles.

In addition, the gap between diesel engine and gasoline engine in power performance is very small, and some performance parameters are even better than gasoline engine. For example, the low-speed torque of diesel engine is relatively large, indicating that the climbing ability of diesel engine is stronger than that of gasoline engine, and the low-speed acceleration is faster than that of gasoline engine.

At present, the quality of diesel oil in most parts of China can't meet the requirements of the latest European emission standards No.3 and No.4 for diesel engine technology. The fuel with high sulfur content will not only lead to the deterioration of diesel engine emission system, but also shorten the engine life and increase the maintenance cost.

In addition, most domestic consumers' awareness of modern diesel engines is still very low. Most people are still stuck in the knowledge of black smoke and unbearable noise in the 1970 s, and there will still be great resistance to diesel vehicles. With the development of new diesel engine technology, diesel vehicles have made great progress in emission and noise reduction.