Research On Basic MAP Of Alternative Fuel Internal Combustion Engine

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 0.8-1.1, within the scope of the performance and fuel economy of air-fuel ratio is simulated calculation. Alternative fuel of air-fuel ratio setting scheme is put forward in low load, small and medium-sized load, large load of internal combustion engine; And get a set of H₂ internal combustion engine under the conditions of air-fuel ratio MAP.After the first widely accurate method, based on the performance and fuel economy of output, make sure the best alternative fuel combustion engine ignition timing. According to each alternative fuel of 54 cases of advanced ignition Angle, painted ignition timing the MAP figure, as a whole, the trend is concerned, simulation ignition timing accord with speed, load to advanced ignition Angle of the influence law. Through comparing three fuel ignition timing, the size also and fuel combustion rate itself concerned.