What are the characteristics of gasoline engine ignition system?

Because gasoline has low viscosity and rapid evaporation, it can form a uniform mixture with air outside the cylinder, and then suck the mixture into the cylinder, or spray gasoline into the cylinder with a gasoline injection system to expand the gas to do work. The disadvantages of gasoline engine are lower thermal efficiency, higher parking loss, more complicated ignition system, less reliability and maintenance convenience than diesel engine. 1, advantages: the speed of gasoline engine is high (generally, the speed of gasoline engine for trucks is 3000-4000 r/min, and the maximum speed of gasoline engine for cars can reach 5000-6000 r/min), and the adaptability is good. Smooth and soft work, convenient and labor-saving operation, light weight, low noise, low cost, easy start, etc. Therefore, it is widely used in cars, small and medium-sized trucks and military off-road vehicles. 2. Disadvantages: high fuel consumption rate, poor economy and low exhaust purification index. Because cars, buses and other gasoline engine vehicles often run in cities, because of road congestion, they are often in a stop-and-go state, and the engines often idle and the temperature is low. Even under normal working conditions, the temperature and pressure of gasoline engine are lower than that of diesel engine. Therefore, under the working condition of gasoline engine, engine oil is easy to produce low-temperature sludge, so it is required that gasoline engine oil has good low-temperature sludge dispersibility.