POWER TRANSMISSION DEVICE

摘要

A power transmission device, comprising a lockup clutch (7) for disengaging and engaging a fluid coupling (2), an automatic transmission clutch (3) installed between the fluid coupling (2) and a transmission (T/M), a control device (22) for controlling the disengagement and engagement of the lockup clutch (7) and the automatic transmission clutch (3), and a trouble detection means (70) for detecting that the lockup clutch (7) causes such a trouble that the clutch is seized in engaged state, wherein the control device (22) disengages the automatic transmission clutch (3) when a vehicle stops after the trouble is detected by the trouble detection means (70), whereby an engine stall when the vehicle stops can be prevented.