AIR-FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

PROBLEM TO BE SOLVED: To prevent A/F from becoming over rich resulting from wall face sticking correction in a supercharging area by computing a sticking fuel correction amount based on two parameters such as intake pressure and cooling water temperature in an air-fuel ratio control device adjusting air-fuel ratio of an internal combustion engine in response to the sticking fuel correction amount. SOLUTION: At the operation time of an engine 10, detection signals of a water temperature sensor 14, an engine revolution detector, and a pressure sensor 20 detecting intake pressure (turbo supercharging pressure) are read into a control device 28. A reflection time correction factor is read from a two dimensional map of a cooling water temperature and intake tube pressure, and is corrected in response to an operation state, and a wall face sticking amount is computed by the reflection time correction factor after correction. A basic fuel injection time is computed from the number of the revolutions of the engine and the intake pipe pressure, the same is corrected by a warming up increasing amount, an air-fuel ratio feedback correction factor and the other various correction factors, and a sticking fuel correction amount is added so as to compute a fuel injection time. A fuel injection valve 16 is controlled according to the fuel injection time.