| 摘要 |
PROBLEM TO BE SOLVED: To provide a driving force transmission system for a four-wheel drive vehicle which is automatically changed to the two-wheel driving system when the traveling condition does not need any four-wheel drive during the four-wheel drive traveling, and capable of preventing degradation of the fuel economy by stopping the rotation in a driven wheel driving force transmission section. SOLUTION: The driving force transmission system comprises a driving force distribution device 40 for outputting the driving force to a driving wheel output shaft and controlling the distribution of the driving force to a driven wheel output shaft, a driven wheel differential device 48 for inputting the driving force from the driven wheel output shaft, a disconnect mechanism 50 for disconnecting the driven wheel differential device 48 from the driven wheel driving shaft, a vehicle speed computation unit 28 for calculating the vehicle speed, a slip ratio computation unit 26 for computing the slip ratio of wheels, and a drive control unit 36 for controlling the driving force distribution device 40 and a disconnect mechanism 50 based on the vehicle speed and the slip ratio. Under the predetermined traveling condition, the transmission of the driving force to the driven wheel output shaft is disconnected, and the driven wheel differential device 48 is disconnected from the driven wheel driving shaft by the disconnect mechanism 50, realizing the two-wheel drive. COPYRIGHT: (C)2009,JPO&INPIT
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