| 摘要 |
An internal combustion engine equipped with a supercharger, a variable valve device, an air-fuel ratio sensor provided in the exhaust passage, an air-fuel ratio feedback control means, and a scavenging air-fuel ratio control means. The variable valve device drives an intake valve and an exhaust valve, and is capable of driving with a valve opening characteristic provided with a valve overlap. The air-fuel ratio feedback control means provides feedback correction of the fuel injection amount on the basis of the output from the air-fuel ratio sensor, and obtains a learning value for information pertaining to air-fuel ratio control from the correction amount in the feedback correction. When the variable valve device is operated with a scavenging valve open characteristic, the scavenging air-fuel ratio control means executes air-fuel ratio control using a learning value learned when the internal combustion engine is operating with a valve open characteristic which is not the scavenging valve open characteristic. The scavenging valve open characteristic is a valve open characteristic having a valve overlap amount such that blow-by of the intake air occurs in the intake stroke during operation of the supercharger. |
