Ignition and fuel injection system for multicylinder engines

摘要

The switching off of one or more cylinders of a multicylinder engine to save fuel when the engine is running lightly loaded has been found to reduce the effectiveness of computer control of ignition timing and fuel injection unless additional fields of stored control information are provided for responding to the various combinations of engine parameter values that arise in operation. Accordingly, with each step of reduction of the number of working cylinders, the control of ignition timing and fuel injection is shifted to a different bank of fixed value memory (ROM).