Engine starting device

摘要

A ring gear to be coupled to a crankshaft of an engine; a starter motor for starting the engine; a pinion gear for transmitting rotation of the starter motor to the ring gear; pinion-gear meshing-engagement unit for moving the pinion gear to achieve meshing engagement with the ring gear; rpm-difference acquiring unit for acquiring an rpm difference between the pinion gear and the ring gear; and restart control unit for allowing the pinion gear to be moved by the pinion-gear meshing-engagement unit when the rpm difference between the pinion gear and the ring gear, which is acquired by the rpm-difference acquiring unit, becomes smaller than a threshold value are provided. The restart control unit includes threshold-value setting unit, and the threshold value corresponding to a characteristic to be input to the threshold-value setting unit is preset.

主权项

1. An engine starting device for an automatic idle-stop system for performing an idle stop when an idle-stop condition is satisfied, the engine starting device comprising:
a ring gear to be coupled to a crankshaft of an engine; a starter motor for starting the engine; a pinion gear for transmitting rotation of the starter motor to the ring gear; rpm-difference acquiring means for acquiring an rpm difference between the pinion gear and the ring gear; a crank angle detector; a pinion-gear actuator for moving the pinion gear to achieve meshing engagement with the ring gear; and restart control means for allowing the pinion gear to be moved by the pinion-gear actuator when the rpm difference between the pinion gear and the ring gear, which is acquired by the rpm-difference acquiring means, becomes smaller than a threshold value, wherein the restart control means comprises threshold-value setting means that sets the threshold-value according to the crank angle detected by the crank-angle detector.