Unit principle of displacement
The volume of space through which the piston moves from top dead center to bottom dead center is called the cylinder displacement. If the engine has several cylinders, the sum of all cylinder working volumes is called the engine displacement. China has a standard for classifying cars according to engine displacement. For example, a car below 1L is a small car. A car larger than 1L is less than or equal to 1.6L. A car larger than 1.6L is less than or equal to 2.5L. A car larger than 2.5L is less than or equal to 2.5L. 4L is a mid-to-high class sedan, and more than 4 is a premium sedan. The practice of dividing the car class by engine displacement is actually somewhat outdated, is a traditional concept, and is not suitable for today's car design. Because the car's product grade positioning, now can not be defined solely based on engine displacement, such as the same car body, there can be several different engines to match, even the same engine, the same displacement models, there can be a very different configuration. Some high-end models may have higher prices and performance than models with larger displacements. For example, several models of the Tianjin Toyota Vios have the same body size and engine displacement (1.5L), but due to differences in configuration. The price ranges from 135,000 yuan to 195,000 yuan. The highest configuration of Vios is more expensive than 1.6L Bora, 1.8L Santana 2000, even 2.0L Sonata GL2.0, China 2.0, Chery Oriental Son 2.4, etc. . For example, the engine displacement is classified into cars, and the 195,000 yuan Vios and 49,900 yuan Geely Meiri (1.3L) should be the same class cars, all of which are ordinary cars. This division is obviously unfair. Therefore, it is necessary to combine three factors to determine the car class. One is the size of the car body, the other is the engine displacement, and the third is the configuration. It is not only one factor, but with the development of the times and the progress of the automobile industry, these standards are constantly Variety.