Patent ID: 9695717
Date: 2017-07-04
CPC Classifications: F01L,F02D

Claim:
1. A control device for an internal combustion engine, the control device comprising: a variable valve timing mechanism, wherein the variable valve timing mechanism includes a first rotation body, which rotates in cooperation with rotation of a crankshaft, and a second rotation body, which rotates together with a camshaft; the variable valve timing mechanism varies a valve timing of an engine valve by changing a relative rotation phase of the second rotation body and the first rotation body using hydraulic pressure, which is supplied from a hydraulic control valve to an advancing chamber and a retarding chamber; the variable valve timing mechanism includes a spring that urges the second rotation body so that the relative rotation phase is located at a position corresponding to a predetermined phase between a most advanced phase and a most retarded phase; when a region of the relative rotation phase where the second rotation body receives urging force from the spring defines a spring region and a region of the relative rotation phase where the second rotation body does not receive urging force from the spring defines a non-spring region, a control amount of the hydraulic control valve needed to hold an actual valve timing at a constant timing in the spring region is greater than a control amount of the hydraulic control valve needed to hold the actual valve timing at a constant timing in the non-spring region; the control device for the internal combustion engine is configured to perform a learning process that learns a holding control amount of the hydraulic control valve when the actual valve timing is held at a constant timing in each of the spring region and the non-spring region; and the control device for the internal combustion engine is configured to perform at least one of