AIR/FUEL RATIO CONTROL APPARATUS OF AN INTERNAL COMBUSTION ENGINE

摘要

An air/fuel ratio control apparatus for smoothening variation of air/fuel ratio among a plurality of cylinders of an internal combustion engine is provided. The apparatus comprises a sensor for measuring output of the internal combustion engine. The apparatus calculates a correlation function of each cylinder by taking a cross-correlation of a value measured by the sensor and a reference signal for each cylinder. The apparatus calculates a smoothing target value which is common for all of the cylinders. The apparatus includes cylinder controllers for producing control input to the respective cylinders such that correlation function converges to the smoothing target value. Regardless of modeling error and dead time, the air/fuel ratio converges to the target value quickly.