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Many countries banned diesel engines, work tools to meet the ending? Diesel engine so dirty?
Since this year, diesel engines have continued to fall into crisis news. On February 26, the Fiat Chrysler Group officially announced the suspension of production of diesel cars since 2022; on February 28th, the German Federal Administrative Court issued a ruling allowing certain major cities (Düsseldorf and Stuttgart) to ban heavy pollution diesel vehicles. On March 1st, Rome, Italy announced plans to ban the production and sale of diesel vehicles by 2024... The mayors of cities such as Paris, Madrid and Athens also announced that they are considering the possibility of bans on the purchase of diesel cars by 2025. The mayor of Copenhagen expressed similar views.
It seems that like dominoes, diesel engines have been severely criticized by developed countries for their environmental performance and their future is still unknown. Moreover, it seems that this is only the beginning, diesel engine or will be the first to usher in the broad reach of the developed countries.
In fact, as the main "labour" of social development, diesel engines are active in passenger and freight transport, and mechanization of workers and peasants, and they have been indispensable. The reason why diesel engines are finally abandoned is mainly due to the backwardness of their environmental performance.
but! Of course, when the automotive media used to popularize automobile knowledge for domestic consumers, it took a long time to promote the environmental performance of diesel cars abroad. It also paid a lot of saliva for the misunderstanding of “diesel engine = black smoke”. When diesel engines were gradually shaped into environmental protection pioneers by the automotive media, all of a sudden, the image of diesel engines began to crumble from Europe, the most respected diesel engine. What really happened was that Xiao Cheng and Xiao Yuan lost. So what role does the diesel engine play in environmental protection? Why is it abandoned?
The analysis of diesel engines in the end is not environmentally friendly and cannot be generalized. To look separately. First of all, the diesel engine works in compression ignition. The compression ratio is far greater than that of the gasoline engine, and the larger cylinder pressure and temperature make it have a good working efficiency, which is reflected in the external fuel economy. This kind of advantage makes the diesel engine adapt to the pressure environment of the global oil crisis in the 1970s, and it is highly valued by many developed countries. As a result, the diesel engine began to make its mark: On the one hand, high fuel efficiency and low fuel consumption are inherently environmentally friendly; on the other hand, high temperatures and high pressures in the cylinder make the combustion of certain components of the fuel relatively complete and perform well in certain pollutant emissions; On the other hand, the media of the manufacturers are making publicity. All of these combined to form a green image of the diesel engine.
However, due to the congenital nature of long-chain hydrocarbon fuels such as diesel and the combustion process in diesel engine cylinders, diesel engines are at a great disadvantage in the emission of pollutants such as carbon dioxide (mainly fine particles). It is precisely the most unbearable pollutants in central cities and densely populated areas.
In order to solve the problem of diesel engine pollution, engineers tried to improve the characteristics of the diesel engine in various aspects. Therefore, the diesel engine technology has also seen continuous and significant progress. The technical terms of the diesel engine include booster, intercooler, high-pressure common rail, electronically-controlled injection, exhaust gas recirculation (EGR), etc., and the tail gas is discharged to the particulate matter. Oxidation catalysis and particle capture have also emerged as two major treatments.
But no matter what kind of method, it is not once and for all, it involves the maintenance of the later period, obviously increases the use cost of the diesel engine, and reduces its attendance ability.
When diesel engines were originally criticized by people, the United States began accusing the Volkswagen Group of installing a coping test program for diesel vehicles entering North America. This procedure allows vehicles to automatically enter environmental protection operations while responding to environmental tests. It shows excellent environmental friendliness, but this kind of environmental protection will cause the vehicle to lose economical and dynamic. Therefore, once it is separated from the environmental test, the vehicle will return to the normal state of high emission but high power and low fuel consumption.
This incident not only caused the public to receive a fare fine of nearly US$30 billion, but also caused a knock-on effect. Many brands in the industry have been questioned about environmental cheating.
In fact, the reason why environmental cheating is because environmental requirements and environmental protection rules are too high for vehicle technology. Automobile companies cannot meet these environmental protection requirements while making cars strong and fuel-efficient. . It also shows that the environmental potential of fuel vehicles, especially diesel vehicles, has almost been excavated.
In fact, after the real situation of the potential weakness of the diesel engine is known to the general public, the atmosphere for requiring a diesel engine to be banned globally has gradually taken shape. This also led to the German environmental protection organization DUH grounding Dusseldorf and Stuttgart on the grounds that particulates in the air exceeded the EU standard. They demanded that they completely ban diesel vehicles on the road. The ruling of the Supreme Administrative Court. However, this ruling may be just a beginning because it is reported that the pollution value of more than 70 cities in Germany exceeds the EU's standard limit (40 micrograms/m3), and it is unknown whether these 70 cities will also move to Dusseldorf. The footsteps of husband and Stuttgart.
On the other hand, environmental laws and regulations are increasingly stringent. In the European Union Euro 6 emission standard diesel engine project, the limit of nitrogen oxides is greatly reduced from 0.18g/km to 0.08g/km. The US EPA's implementation of emission standards in 2007 is to reduce the limit to 0.05g/mi, equivalent to 0.03g. /km. In this case, the diesel engine's R&D costs may be beyond imagination.
When the diesel engine is confused, it is the time when a new energy vehicle passes. In an era when a large number of electric vehicles are being transported, the weight of diesel engines is accelerating. It can be imagined that in the future, on the balance of choice, the diesel engine will become more and more weightless until the end of the drama.
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