Chapter 5 Gasoline fuel supply system Section 1 Fuel mixture formation and combustion 3.3 Speed When speed increases,turbulence in the cylinder enhances,the flame speed increases,the combustion process cuts down,and knocking combustion reduces. 3.4 Load When load is reduced,the gas mixture into the cylinder reduces,the amount of residual gas is constant essentially,the dilution of mixture becomes larger,the flame propagation speed decreases,and burning deteriorates,so they need denser gas mixture,so that cylinder temperature and pressure drop,the possibility of knocking combustion is reduced.Generally,the ignition advance angle needs to increase. 3.5 Atmospheric condition When atmospheric pressure is low,the aeration quantity of cylinder is reduced, the mixture becomes denser,compression pressure is low,ignition extension becomes long,flame propagation becomes slow.Economy and power decrease,but the possibility of knocking combustion is reduced. When atmospheric temperature is high,the same decline occurs in the aeration quantity of cylinder,and economy and power become worse,being prone to produce knocking combustion Northwest A&F University 业机被电子工程学原 Automobile and Tractor
Automobile and Tractor Northwest A&F University Chapter 5 Gasoline fuel supply system 3.3 Speed When speed increases, turbulence in the cylinder enhances, the flame speed increases, the combustion process cuts down , and knocking combustion reduces. 3.4 Load When load is reduced, the gas mixture into the cylinder reduces， the amount of residual gas is constant essentially, the dilution of mixture becomes larger, the flame propagation speed decreases, and burning deteriorates, so they need denser gas mixture, so that cylinder temperature and pressure drop, the possibility of knocking combustion is reduced. Generally，the ignition advance angle needs to increase. 3.5 Atmospheric condition When atmospheric pressure is low, the aeration quantity of cylinder is reduced, the mixture becomes denser, compression pressure is low, ignition extension becomes long, flame propagation becomes slow.Economy and power decrease, but the possibility of knocking combustion is reduced. When atmospheric temperature is high, the same decline occurs in the aeration quantity of cylinder, and economy and power become worse, being prone to produce knocking combustion. Section 1 Fuel mixture formation and combustion
Chapter 5 Gasoline fuel supply system Section 2 Carburetor fuel supply system 1.Function and Composition Function According to the requirements of a variety of working conditions of the engine,it can supply certain quantity and viscosity of the combustible mixture. Composition fuel tank,fuel pump,fuel filter,carburetor,oil pipe and so on. fuel tank fuel filter gasoline pump 机械电子工程学 Automobile and Tractor Northwest A&F University
Automobile and Tractor Northwest A&F University Chapter 5 Gasoline fuel supply system 1. Function and Composition Function：According to the requirements of a variety of working conditions of the engine, it can supply certain quantity and viscosity of the combustiblemixture. Composition：fueltank, fuel pump, fuel filter, carburetor, oil pipe and so on. Section 2 Carburetor fuel supply system