| 摘要 |
When an engagement of the dog clutch is requested, the dog clutch is engaged while allowing satisfactory sound vibration performance regardless of whether the main drive wheels are in a non-slip state or a slip state. The system for transmitting drive force to the left and right rear wheels (19, 20) comprises a dog clutch (8) and an electronically controlled coupling (16), and a 4WD control unit (34) controls the engagement and disengagement of the dog clutch (8) and the engagement and disengagement of the electronically controlled coupling (16). In this clutch control device for a four-wheel drive vehicle, when there is a request to engage the dog clutch (8) from a disengaged state, the 4WD control unit (34), during the engagement control of the electronically controlled coupling (16), first controls the engagement of the electronically controlled coupling (16), monitors the change gradient ”N/dt of the clutch rotational speed difference ”N of the dog clutch (8) and starts engagement of the dog clutch (8) when it is determined that the gradient of the clutch rotational speed difference ”N is no longer decreasing. |
