Control apparatus of variable valve timing mechanism and method thereof

摘要

A rotation phase of a camshaft relative to a crankshaft is detected based on a crank angle signal and a cam angle signal, and also the currents or voltages of electromagnetic brakes constituting a variable valve timing mechanism are converted into the rotation phase, to estimate a change in the rotation phase during the rotation phase is detected, based on the rotation phase obtained by converting the currents or voltages.