Study on the Control of HCCI Ignition by Controls Parameters

Using two kinds of mixture as fuel,the influence of cetane number, octane number, compression ratio, equivalence ratio and intake charge temperature in the ignition process of HCCI engine has been evaluated. The results indicate that the ignition delays of combustion increase with the increase of the octane number and the decrease of the cetane number. The start of ignition is strongly affected by fuel structure and the running conditions of the simulate engine. The changes of the compression ratio, equivalence ratio, and initial temperature will bring on distinct change of the ignition of combustion. The initial pressure has slighter influence on the ignition delay for the fuels with high cetane number compared with the high octane number fuels. In conclusion,the influence of the control parameters to the ignition delay is increased with the increase of the octane number and the decrease of the cetane number of the fuel.