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A controlling method of a four wheel drive vehicle includes a detecting step and a controlling step. The detecting step detects difference in speeds between a front driving shaft and a rear driving shaft. The controlling step controls an apparatus for controlling a distribution ratio of driving torq

A controlling method of a four wheel drive vehicle includes a detecting step and a controlling step. The detecting step detects difference in speeds between a front driving shaft and a rear driving shaft. The controlling step controls an apparatus for controlling a distribution ratio of driving torque of the four wheel drive vehicle so as to harmonize the difference in the speeds with a desired value.

대표청구항 ▼

A method for controlling the drive train of a four wheel drive vehicle having an engine and front drive wheels and rear drive wheels, the four wheel drive vehicle including an apparatus for changing a distribution ratio of driving torque between the front wheels and the rear wheels, the apparatus in

A method for controlling the drive train of a four wheel drive vehicle having an engine and front drive wheels and rear drive wheels, the four wheel drive vehicle including an apparatus for changing a distribution ratio of driving torque between the front wheels and the rear wheels, the apparatus including a transfer mechanism, and a first and a second clutch, the transfer mechanism receiving an output torque from said engine, and distributing the received output torque into two output torque lines connected to said front drive wheels and said rear drive wheels, respectively, the first clutch being located in one of said two output torque lines and transmitting a first amount of the output torque to a front driving shaft connected to said front drive wheels, while the second clutch being located in the other of said two output torque lines and transmitting a second amount of the output torque to a rear driving shaft connected to said rear drive wheels, said method comprising the steps of: detecting speeds of the front driving shaft and the rear driving shaft; calculating an actual difference in speed between the detected speeds of said front and rear driving shafts; and determining said first and second amounts of the output torque transmitted by said first and second clutches to said front and rear driving shafts, respectively, to change an actual distribution ratio of driving torques between said front and rear drive wheels, so that the calculated difference in speed between said front and rear driving shafts is reduced to a desired value.