VALVE TIMING CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE AND CONTROLLER FOR VALVE TIMING CONTROL DEVICE

摘要

Provided is an electric-motor-driven valve timing control device for an internal combustion engine with which the valve timing control device can be operated even when a portion of coils of an electric motor has broken. The electric motor has two systems of switching brushes, each system being constructed by a set of positive-electrode and negative-electrode switching brushes. When an electricity-feeding line used for electricity-feeding to one system of the two systems has broken, the valve timing control device is configured to stop energization to the other system or reduce an energization amount to the other system, after having energized the other system of switching brushes until such time that a predetermined time has expired from a start of the engine, thus enabling the relative rotational phase of a camshaft to be converted to a phase suitable for starting.

主权项

1. A valve timing control device for an internal combustion engine for changing a relative rotational phase of a camshaft to a crankshaft by energizing a plurality of coils of an electric motor, comprising:
the electric motor having two systems of switching brushes, each of the two systems being constructed by a positive-electrode switching brush and a negative-electrode switching brush, wherein, when an electricity-feeding line used for electricity-feeding to one system of the two systems of switching brushes or one of the plurality of coils has broken, the valve timing control device is configured to stop energization to the switching brushes or reduce an energization amount to the switching brushes, after having energized the switching brushes until such time that a predetermined time has expired from a start of the engine.