Engine speed controller having PI gains set by engine speed and engine speed error

A PI control strategy controls engine speed to an engine speed set-point. A proportional map is populated with data values to be used in calculating the P component of the strategy. An integral map is populated with data values to be used in calculating the I component. Each data value in the maps is correlated with a speed data value representing engine speed (N) and a speed error data value representing the difference between engine speed and engine speed set-point (N_DIF_MAX_LIM). Values for proportional and integral components are selected from the respective maps by processing current engine speed data and current engine speed error data. The strategy uses the values from the maps for controlling engine speed to the speed set-point. Data values from other maps ( and ; or and ) modify the selected values from the proportional and integral maps for transmission type, transmission gear, and engine temperature.