Valve timing controlling device of internal combustion engine

A valve timing controlling device of internal combustion engine having an intake valve and an exhaust valve driven at a predetermined timing in synchronism with a rotation of the internal combustion engine for opening and closing an intake pipe and an exhaust pipe connected to a combustion chamber comprising:

• means for detecting operating conditions of the internal combustion engine;
• means for calculating a target valve timing with respect to the operating conditions of the internal combustion engine based on a result of detection from the means for detecting operating conditions;
• means for varying a valve timing of opening and closing at least one of the intake valve or the exhaust valve;
• means for detecting an actual valve timing of the valve or the valves of which opening and closing timing was varied;
• means for controlling actual valve timing which generates a controlled variable for controlling the means for varying valve timing based on a value relating to a deviation between the target valve timing and the actual valve timing;
• means for calculating a difference of integrations based on a value relating to the deviation between the actual valve timing and the target valve timing;
• means for controlling integration which calculates a correction value to the integrations by integrating the difference of integrations in order to correct the controlled variable for the means for varying valve timing generated by the means for controlling actual valve timing;
• and
• means for terminating the integration of the means for controlling integration when the actual valve timing varies so as to follow the target valve timing.