Controlled variable computing apparatus for internal combustion engine

A controlled variable computing apparatus for an internal combustion engine, comprising:

• revolution signal generating means for outputting a revolution signal in synchronism with revolution of said internal combustion engine each time revolution by a predetermined angle is made;
• and
• control means for computing a controlled variable for a control target of said internal combustion engine each time said revolution signal is inputted,
• wherein said control means includes:
• controlled variable computing means for computing a driving timing and a driving time period for said control target at a point in time when the number of times of input of said revolution signal reaches a predetermined number;
• and
• driving control means for controlling the driving of said control target based on said driving timing and said driving time period each time said revolution signal is inputted, and
• wherein if the operation time period of said controlled variable computing means overlaps the operation time period of said driving control means, said driving control means is prioritized to perform its operation by suspending an operation of said controlled variable computing means.