Patent ID: 7086381

Claim:
A control apparatus of an internal combustion engine, comprising: a plurality of intake air amount control systems including at least one intake air amount control system using a variable valve mechanism which controls an intake air amount by variably controlling opening and closing characteristic of an engine valve; a diagnosis mechanism which diagnoses a failure for each of said plurality of the intake air amount control systems; and at least one of: a first intake air amount adjustment mechanism which adjusts, when said diagnosis mechanism detects that at least one intake air amount control system using the variable valve mechanism has failed, the intake air amount by another intake air amount control system using the variable valve mechanism which is diagnosed to be normal by said diagnosis mechanism or by the intake air amount control system which does not use the variable valve mechanism, and a second intake air amount adjustment mechanism which adjusts, when said diagnosis mechanism detects that said intake air amount control system which does not use the variable valve mechanisms has failed, the intake air amount by at least one intake air amount control system using the variable valve mechanism which is diagnosed to be normal by said diagnosis mechanism.