代用燃料内燃机基础MAP研究车辆工程专业论文.docx

Ab Abstract - - II - Abstract Alternative fuel will become internal combustion engine fuel sources because of human desire，replacement fuel physic-chemical properties decide that internal combustion engine must optimize compression ratio, air/fuel ratio and advanced ignition Angle. But,the traditional test methods match long period and high cost. Based on HH465QE1 gasoline internal combustion engine replacement compressed natural gas, hydrogen and ethanol fuel as research object, by performance as the research target, use GT - POWER internal combustion engine simulation software, different fuel compression ratio is defined, air-fuel ratio and advanced ignition Angle basic MAP is calculated. HH465QE1 gasoline internal combustion engine simulation calculation model is established, through the simulation calculation, internal combustion engine prototype is rose 1.9% compared the maximum power, the maximum torque is dropped 2.4%, minimum fuel consumption is decreased 0.5%, the simulation results with the original machine basic data. Because the natural gas and hydrogen volume low calorific value of small, standard condition dynamic performance is poorer, the way to adopt a pressurization simulated computation, natural gas and hydrogen respectively the inlet pressure 0.15 MPa, 0.3 MPa. By comparing different compression ratio of internal-combustion internal combustion engine alternative fuel effective power, efficient fuel consumption, according to internal combustion internal combustion engine design pressure increase rate and the cylinder pressure requirements, the selection of compressed natural gas compression ratio of internal -combustion internal combustion engine for 14, hydrogen compression ratio of internal-combustion internal combustion engine for 13, ethanol compression ratio for 11. Analysis the compression ratio after load, speed variations of variable the advantage of compression ratio. Typical working conditions for setting in excess air coefficient 0.8-1