Patent ID: 8290693
Filing Date: 2012-10-16
Classification: F02D,F02N,Y02T

Abstract:
1. An internal-combustion-engine automatic stop and restart system performing automatic stopping operation for automatically stopping an internal combustion engine when an automatic stopping condition is satisfied while the internal combustion engine is operated and performing restarting operation for restarting the internal combustion engine when a restarting condition is satisfied while the internal combustion engine is in an automatic stopping operation, the internal-combustion-engine automatic stop and restart system, characterized by further comprising: a rotation speed calculation unit that calculates a rotation speed of the internal combustion engine; a throttle valve that adjusts intake air of the internal combustion engine; a ring gear coupled with the crankshaft of the internal combustion engine; a pinion gear that is driven to rotate by a starter motor for restarting the internal combustion engine; a pinion pushing unit that pushes out the pinion gear toward the ring gear; a restarting control unit that performs restarting control of the internal combustion engine by making the pinion pushing unit push out the pinion gear so as to engage the pinion gear with the ring gear, when the restarting condition is satisfied in a time period from a time instant when the automatic stopping condition is satisfied to a time instant when the rotation of the internal combustion engine stops; and a throttle valve control unit that opens the throttle valve even when the restarting condition has not been satisfied, when the rotation speed of the internal combustion engine calculated by the rotation speed calculation unit becomes lower than a predetermined value in a time period from a time instant when the automatic stopping condition is satisfied to a time instant when the rotation of the internal combustion engine stops, and that stops control of the throttle valve in a time period from a time instant when the rotation of the internal combustion engine stops to a time instant when the restarting condition is satisfied.