汽油标号的含义（The meaning of gasoline label）.docVIP

汽油标号的含义（The meaning of gasoline label） About the meaning of gasoline label At present, the gasoline market has 90, 93, 95, 97 and other labels, these figures represent the gasoline octane value, that is, gasoline antiknock, and gasoline cleaning is irrelevant. The so-called high standard gasoline cleaner is misleading. According to the compression ratio of the engine or the requirement of the automobile instruction manual, it is more scientific and economical, and can give full play to the efficiency of the engine. In the design phase of the automobile engine, the fuel oil is set according to the compression ratio. The compression ratio is a very important structural parameter of an engine. It represents the ratio of the volume of the gas at the beginning of the compression at the end of the piston to the volume of the piston at the end of the tdc. In terms of power and economy, the compression ratio should be as large as possible. High compression ratio, good power, high thermal efficiency, vehicle acceleration, maximum speed will be increased accordingly. However, the compression ratio of gasoline engine can not be too large due to the performance of cylinder material and the detonation of gasoline combustion. In brief, high compression ratio vehicles use high grade fuel. The higher grade of fuel oil burning speed will be slower, the lower the combustion knock, the engine needs a higher compression ratio; on the other hand, low grade fuel combustion speed, combustion knock, relatively low compression engine. The fuel label also relates to the ignition timing of the engine. Low grade gasoline burning speed, ignition angle to lag behind; high standard fuel burning speed is slow, ignition angle to advance. For example, one engine in accordance with the specification requirements should be added to 93 gasoline, now with 90 gasoline, may cause difficulty in starting the engine; acceleration, the engine has a crisp sound of metal crash; long-distance traffic, switch off