Patent ID: 7316212
Filing Date: 2008-01-08
Classification: F01L,F02D,Y02T

Abstract:
1. A cam phase control system for an internal combustion engine, for controlling a cam phase as a phase of at least one of an intake cam and an exhaust cam relative to a crankshaft, comprising: a variable cam phase mechanism that changes a magnitude relationship between a first force that acts in a direction of advancing the cam phase and a second force that acts in a direction of retarding the cam phase, to thereby change the cam phase, and holds the first and second forces in a balanced relationship, to thereby hold the cam phase; engine speed-detecting means for detecting an engine speed of the engine; cam phase-detecting means for detecting the cam phase; target cam phase-setting means for setting a target cam phase as a target to which the cam phase is controlled; control value-calculating means for calculating a control value for causing the detected cam phase to follow up the target cam phase, with a predetermined control algorithm; and control input-calculating means for correcting the calculated control value according to the detected engine speed to thereby calculate a control input for controlling the variable cam phase mechanism.