This invention has an object to enable update of learning values of a large number of grid points in one session of a learning operation and also to easily adjust learning speed and efficiency in a wide learning region.
An engine 10 is provided with an ECU 60 for executing engine control by using various control parameters. The ECU 60 includes a learning map storing a learning value of the control parameter and executes weighting learning control of the learning value. In the weighting learning control, each time the control parameter is acquired, a weight w kij decreasing larger if a distance from a position of an acquired value z k of the control parameter to a grid point is larger is set to each of the grid points of the learning map. Then, on the basis of the acquired value z k of the control parameter and the weight w kij , the learning values Z ij (k) at all the grid points are updated. As a result, all the learning values can be efficiently updated in one session of the learning operation.