Abstract: In a property correcting system of an automatic transmission according to the present invention, a difference of revolutions between input revolutions Nin of a torque converter and turbine revolutions Nt is compared with target rotational difference ?N, and is increased/reduced by the feedback operation (S6 and S7). It is checked to see if the difference of revolutions is converged to the target rotational difference ?N (S8). When a driving duty duty which is converged to the target rotational difference ?N is within a shipping determining standard, the value is stored (S10). A differential value between the stored driving duties duty of the respective automatic transmissions and the reference value is written to a TCU, as the amount of correction of the respective automatic transmissions, thereby correcting the variation in properties of the individual automatic transmissions, starting from the initial shipping timing.

Abstract: In a property correcting system of an automatic transmission according to the present invention, a difference of revolutions between input revolutions Nin of a torque converter and turbine revolutions Nt is compared with target rotational difference ?N, and is increased/reduced by the feedback operation (S6 and S7). It is checked to see if the difference of revolutions is converged to the target rotational difference ?N (S8). When a driving duty duty which is converged to the target rotational difference ?N is within a shipping determining standard, the value is stored (S10). A differential value between the stored driving duties duty of the respective automatic transmissions and the reference value is written to a TCU, as the amount of correction of the respective automatic transmissions, thereby correcting the variation in properties of the individual automatic transmissions, starting from the initial shipping timing.

Abstract: The objective of the present invention is to drastically improve the running ability of a four-wheel drive vehicle by variably controlling the torque distribution ratio between the front and rear wheels. The power transfer device according to the present invention includes a transmission output shaft for receiving the power which has been varied through a transmission system; a front wheel output shaft for transferring the power to the front wheels; a rear wheel output shaft for transferring the power to the rear wheels; a front wheel clutch provided between the transmission output shaft and the front wheel output shaft, the front wheel clutch being capable of switching between an engagement state and an open state; and a rear wheel clutch provided between the transmission output shaft and the rear wheel output shaft, the rear wheel clutch being capable of switching between an engagement state and an open state.