The fuel consumption limit standard is conducive to promoting the development of energy-saving technologies for heavy-duty commercial vehicles
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The "Limited Standard for Fuel Consumption of Heavy-duty Commercial Vehicles," which will be applied to heavy-duty commercial vehicle products that are newly declared in the "Announcement", is loose in the first phase, but it has played a role in monitoring the bottom line of fuel consumption of new products. With the requirements of the first phase on July 1, 2014 covering all commercial vehicles with a total design mass of more than 3,500 kg and the implementation of the second phase of the subsequent fuel consumption limit, the successive increase in pressure will promote the energy conservation of heavy commercial vehicle companies. And key technological advances.
According to statistics, by the end of 2011, the number of cars in China reached 93.5 million, which consumed 46% of the total annual national fuel consumption. Among them, the number of heavy-duty commercial vehicles is 13 million, accounting for 13.9% of the total vehicle ownership, but its fuel consumption accounts for 49.2% of the total vehicle fuel consumption. In other words, it accounts for 22.6% of the total annual national fuel consumption. . Therefore, the introduction of heavy duty commercial vehicle fuel consumption limit standards can effectively control the consumption of gas, diesel, nearly a quarter of the large fuel consumption, that is, the fuel consumption of heavy commercial vehicles, to promote the entire society can save energy key With the overall effect of the overall situation.
In order to meet increasingly stringent fuel consumption limit standards, heavy-duty commercial vehicle companies, whether they are willing or unwilling, can only spare no efforts to continuously reduce fuel consumption through technological progress, and reduce fuel consumption is a comprehensive project. It's not that improving a car's parts or a total achievement can be successful. Therefore, the fuel consumption limit standard actually promotes the comprehensive technological progress of heavy commercial vehicles.
Of course, the most important thing to improve is the engine-based power system. After all, the oil is the engine. Whether it can fundamentally reduce fuel consumption depends on the engine. Heavy-duty commercial vehicles generally use diesel engines, but there are also individual products that use gasoline engines. Both diesel engines and gasoline engines are internal combustion engines. To reduce the fuel consumption of internal combustion engines, two paths are mainly used: to increase thermal efficiency and increase power, in other words, to Makes the engine output as little power as possible at the same power output and allows the engine to output more power when it consumes the same amount of fuel. Since the internal combustion engine cycle has a chemical process and a gas exchange process, it is not a Carnot cycle, so theoretically, the thermal efficiency of the internal combustion engine can reach 100%, although at the practical level, due to friction and other factors can not reach 100%, but 85% of the Thermal efficiency can be achieved completely. At present, the thermal efficiency of internal combustion engines is only 40%, and the prospects for technological progress are very broad. The best way to increase power is to raise engine cylinder pressure and speed, and to find the best balance between competing goals. There is no doubt that reducing the fuel consumption by increasing the thermal efficiency of the internal combustion engine and increasing the power will inevitably promote the technical progress of the engine.
In addition, lightweight technology can reduce fuel consumption by reducing vehicle weight. Lightweight is also a systematic technology, from the CAE finite element analysis technology of the smallest components to the weight reduction technology of axles and other components. The application of new materials in the series will greatly promote the comprehensive progress of heavy-duty commercial vehicle technology. The methods of reducing fuel consumption, such as full load-carrying body and vehicle models with reduced drag coefficient, have promoted the technical progress of commercial vehicles at different levels and in different aspects.
In addition, it should be noted that the fuel consumption limit standard further raises the threshold for the production and sales of gasoline and diesel commercial vehicles, increases the production costs of gasoline and diesel vehicles, and prompts some companies to think whether they can find a way to bypass the standard. . Commercial vehicles that do not use gasoline or diesel are naturally not subject to this standard. Therefore, the fuel consumption limit standard has stimulated the technical progress of natural gas commercial vehicles and pure electric commercial vehicles.