Chapter 5 Gasoline fuel supply system Section 1 Fuel mixture formation and combustion generally the gasoline and air mixture in the intake passage is sent into the cylinder, and compressed by the end of electric spark that ignites the mixture for completing work. For the full evaporation of gasoline,one way is to create an environment that is conducive to evaporate,such as increasing temperature,lower pressure,increasing surface area of evaporation,accelerating air flow speed and so on,which can be achieved through the carburetor.Another method is to use pressure fuel injection system to pulverize the gasoline to form the mixture. In order to achieve that mixture in the cylinder can burn quickly and completely, in addition to better fuel pulverization,evaporation and uniformly mixed with air,it also requires the appropriate ratio of fuel and air.The gasoline and air mixture ignition range is excess air coefficient a =0.4-1.4,and when a is different,the internal combustion engine power and fuel consumption rate are very different. Experiments show that when a is 0.85-0.95,internal combustion engine produces maximum power,and when a is 1.05-1.15,internal combustion engine has the minimum fuel consumption rate. 机械电子工程学度 Automobile and Tractor Northwest A&F University Automobile and Tractor Northwest A&F University Chapter 5 Gasoline fuel supply system generally the gasoline and air mixture in the intake passage is sent into the cylinder, and compressed by the end of electric spark that ignites the mixture for completing work. For the full evaporation of gasoline, one way is to create an environment that is conducive to evaporate, such as increasing temperature, lower pressure, increasing surface area of evaporation， accelerating air flow speed and so on，which can be achieved through the carburetor. Another method is to use pressure fuel injection system to pulverize the gasoline to form the mixture. In order to achieve that mixture in the cylinder can burn quickly and completely, in addition to better fuel pulverization, evaporation and uniformly mixed with air, it also requires the appropriate ratio of fuel and air. The gasoline and air mixture ignition range is excess air coefficient α = 0.4-1.4, and when α is different, the internal combustion engine power and fuel consumption rate are very different. Experiments show that when α is 0.85-0.95，internal combustion engine produces maximum power, and when α is 1.05-1.15，internal combustion engine has the minimum fuel consumption rate. Section 1 Fuel mixture formation and combustion