VALVE DEVICE AND VALVE CONTROL METHOD

摘要

When a valve lift control signal is received from a control unit 10, two coils from amongst the coils 18a-18d in a step motor 18 are excited and an aperture of a valve 14 is regulated. When the aperture regulation of the valve 14 is completed and a fixed period of time elapses, the excitation mode of the step motor 18 is switched from 2-phase to 1-phase.