Patent US 4,337,513

A process for electronically controlling an internal combustion engine employ a plurality of engine controlling programs to be executed by a central processing unit classified into a number of task programs in accordance with processing functions of the CPU. The periods at which the task programs are to be activated are determined in consideration of the influential significance of the tasks in controlling the engine, whereby the task programs are executed in accordance with the activation periods thereof under supervision of a program for monitoring the plurality of the engine control programs.