Patent ID: 8554447
Filing Date: 2013-10-08
Classification: F02D,Y02T

Abstract:
1. An internal combustion engine system controller for controlling an internal combustion engine system, the internal combustion engine system comprising: the internal combustion engine system controller comprising: a sub-feedback learning portion configured to acquire a sub-feedback learning value being an amount corresponding to a steady component of a sub-feedback amount, the sub-feedback amount corresponding to a control amount for performing feedback control on a fuel injection amount by each of the plurality of fuel injection valves so that the air-fuel ratio of the exhaust gas corresponding to the output of the downstream-side air-fuel ratio sensor becomes equal to a stoichiometric air-fuel ratio; a state determining portion configured to repeatedly determine, to which of at least three states including: a learning update-speed setting portion configured to set an update speed of the sub-feedback learning value by the sub-feedback learning portion in accordance with a result of determination by the state determining portion so that the update speed becomes higher in the unstable state than in the intermediate state and higher in the intermediate state than in the stable state, wherein the state determining portion is configured: