| 摘要 |
An improved apparatus for controlling the shift between two and four-wheel drivings comprises sensors for detecting the revolution velocities of a propeller and axle shafts, and a calculation unit for calculating a predetermined time duration during which the difference of the revolution velocities is less than a predetermined value after a shift member of the propeller shaft is shifted. A shift member of the axle shaft is shifted at a time during the predetermined time duration to be calculated by the calculation unit so that the shift is smoothly performed from two to four-wheel drivings without producing any gear sound or noise even in a high speed running.
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