Compared with gasoline engines, diesel engines have low carbon dioxide emissions and relatively low fuel consumption. Therefore, people think that diesel engines are more environmentally friendly. Is this true?
By 2014, European governments have recommended the use of diesel engines. With the encouragement of such policies, the sales of diesel engine cars will reach nearly half of the sales of cars in Europe. However, after these years of development, there is a certain correlation between the lack of pollutants discovered by diesel engines in various countries and the frequent occurrence of respiratory symptoms in recent years. People can not help but question whether the diesel engine is environmentally friendly.
Compared with gasoline engines, the cost of diesel engines will be higher. Therefore, major manufacturers are also making great efforts to miniaturize gasoline engines and increase output power. As a result, pollutant emissions from gasoline engines have also been greatly reduced. At the same time, the excellent performance of diesel engines has also been continuously excavated. For example, the performance and parameters of Volkswagen diesel engine vehicles are excellent. However, when everyone is optimistic about diesel engines, Volkswagen is exposed in the “tail valve†incident. Out of the cheating behavior, so that you eat melons popping up, people on the environmental performance of diesel engine car completely changed from "suspect" to "negative."
The problem with diesel engines is the emission of nitrogen oxides! The formation process of nitrogen oxides NOx is a temperature-related chemical reaction process. When the engine generates high temperatures of combustion, nitrogen N2 and oxygen O2 react in the air to form nitrogen oxides NOx. Since the combustion mechanism of diesel engines is different from that of gasoline engines (introduced previously, gasoline engines are spark ignited, diesel engines are compression-ignition), and their physical and chemical properties are different, diesel engines generate higher temperatures when burned, and they are prone to produce. More NOx, and in the exhaust emissions, NOx is mainly composed of 93% of NO (nitrogen oxide) and 5% of NO2 (nitrogen dioxide nitrogen) and the remaining less nitrogen oxides such as N2O ( Nitrous oxide (nitrous oxide) composition. Since nitrogen oxide NOx is the main cause of acid rain formation, it is being restricted by increasingly stringent emission regulations.
As a result, it may have turned a big circle, and everyone has returned to the starting point. The focus of environmental protection cars is still on the new energy vehicles such as electric vehicles, hybrid vehicles and fuel cells. Who can take the lead in the new round of environmentally friendly energy vehicle technology and who will quickly occupy a favorable position in the new round of competition?
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