Patent ID: 6978771
Filing Date: 2005-12-27
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. A method for operating a homogeneous charge compression ignition engine including a combustion chamber retaining a piston that compresses a mixture of fuel and oxygen-containing gas to ignite the compressed mixture, while internal exhaust gas recirculation is performed, the method comprising: determining the air-fuel ratio and the internal exhaust gas recirculation amount; determining whether there is a possibility of misfires or knocking occurring due to a change in the air-fuel ratio using a first map or first relationship formula showing the relationship of the air-fuel ratio and the internal exhaust gas recirculation amount in which stable homogeneous charge compression ignition operation is enabled; and adjusting the internal exhaust gas recirculation amount based on the first map or first relationship formula when there is a possibility of change in the air-fuel ratio causing misfires or knocking.