When it comes to diesel cars, many people's first reaction is: like a tractor, the noise is loud, black smoke, but in fact, the advanced diesel engine, has not been as many people think, many diesel cars in Europe, not only strong power, noise and vibration and gasoline car gap is not large, and the fuel consumption is still very low, like the general compact car 100 km fuel consumption is basically about 5 liters, BMW 5 Series actual 100 km fuel consumption is only 6L, such diesel cars are too fragrant!
So, why is such a fragrant diesel car not popular in China?
The shortcomings of the diesel engine itself
The advantages of diesel vehicles are very obvious, the compression ratio is generally 12 ~ 22, the fuel economy is better, and the fuel consumption of gasoline hybrid vehicles is easily reached. Torque parameters are relatively high, so many freight cars use diesel engines.
But the disadvantages of diesel vehicles are also quite obvious.
1. Although the torque is large, the acceleration is slow
Many people don't understand, isn't it said that torque determines acceleration ability? Remember a conclusion, in any case, the acceleration ability is determined by the power, and the power is equal to the torque multiplied by the speed, the gasoline engine although the torque is not high, but the speed is large, the torque is not enough to make up for the speed, and the diesel engine although the torque is large, but the liter power is low, the maximum speed can only be maintained at about 4000 rpm, resulting in zero hundred acceleration is much slower than the same displacement of gasoline vehicles.
2, the noise vibration is large
Although the excellent diesel engine, its noise and vibration and gasoline engine gap is not large, but the diesel engine is compression-ignition type, the compression ratio is higher, which is doomed to the average effective pressure of the diesel engine cylinder is much higher than the gasoline engine, coupled with the long stroke of the engine characteristics, it is inevitable that the noise of the diesel engine is still a little higher than the gasoline engine. The reason why the diesel engines of many European cars do not sound noisy is because a lot of efforts have been made in sound insulation and noise reduction, and Europeans do not attach as much importance to noise as the Chinese.
3, diesel engine technology is more difficult
Diesel engine research and development difficulty, in fact, than the gasoline engine is higher, it is the use of compression combustion design, the number of fuel injection is more, the control logic of injection is more complex, its cylinder for the pressure limit is higher, diesel engine emission treatment is more complex, THEREC + DPF + SCR and so on. In terms of technical difficulty in all aspects, the difficulty of building a diesel engine is even higher.
National reasons
In addition to the shortcomings of the diesel engine itself, diesel vehicles are not popular in China, and there are other reasons.
For example, the oil problem, domestic diesel oil, and the European region is far from the gap, resulting in a higher frequency of domestic diesel engine maintenance.
Another example is the supply of diesel, every year there are often oil shortages throughout the country, diesel is in short supply, the need to queue up to refuel, greatly affecting the experience of diesel owners.
And the most important reason is that diesel is a strategic resource on the mainland, which is used by many heavy industry and military products.
Therefore, under the influence of various reasons, diesel vehicles have not become popular in the mainland, but with the emergence of various hybrid models, the advantages of diesel vehicles in fuel economy have disappeared, and the future is the world of new energy vehicles.