Jatco Corporation

Tomomasa Ikeda

Hiroki Kawakami

Shinichiro Watanabe

Yusuke Nakano

Katsuya Kobayashi

Kouzi Matsumoto

Yoshihiro Kurahashi

A transmission controller judges whether or not there was performed a specific shift operation where the mode of a transmission is alternately switched between a D-mode and a R-mode, and when it is judged that the specific shift operation was performed and when a forward clutch is engaged, the forward clutch is brought into an engaged state by supplying a hydraulic pressure lower than a lock pressure, with which a locking mechanism is brought into a locked state, to an ON-pressure piston chamber.

Automatic transmission equipped with friction element having locking mechanism attached thereto, and control method therefor

A controller controls a continuously variable transmission including a variator with a primary pulley, a secondary pulley, and a power transmission member mounted therebetween. A torque converter is provided with a rotational speed detector detecting the rotational speed of a rotor located closer to drive wheels than the torque converter, a rotational speed change amount calculator calculating a change amount in the rotational speed per unit time, a limit setting unit that sets a higher absolute value of a limiter for the change amount as a rotational speed difference between an input shaft and an output shaft of the torque converter increases, a final change amount setting unit setting the smaller of the absolute value of the change amount and of the limiter as a final change amount, and a hydraulic controller controlling a hydraulic pressure to the variator based on the final change amount.

Controller for continuously variable transmission and control method thereof

An automatic transmission calculates a current thermal load state of the frictional element, predicts (S, S), prior to the start of the shift, a heat generation amount of the frictional element if the shift is performed in the first shift mode, predicts (S, S) a thermal load state of the frictional element upon shift completion on the basis of the current thermal load state of the frictional element and the predicted heat generation amount, and either performs (S, S) the shift in a second shift mode, in which a heat generation amount is lower than that of the first shift mode, or prohibits (S) the shift when the predicted thermal load state upon shift completion is inside a predetermined region.

Shift control device for automatic transmission and control method thereof

An automatic transmission calculates a current thermal load state of the frictional element, predicts (S), prior to the start of the shift, a heat generation amount of the frictional element during the shift, predicts (S, S) a thermal load state of the frictional element upon shift completion on the basis of the current thermal load state and the predicted heat generation amount, and when the predicted thermal load state upon shift completion is inside a predetermined region, either performs (S, S) the shift after modifying a shift mode such that the heat generation amount of the frictional element is smaller than that of a case in which the predicted thermal load state upon shift completion is outside the predetermined region, or prohibits (S) the shift, wherein the predetermined region is set at a different region depending on whether the shift is an upshift or a downshift.

An automatic transmission calculates a current thermal load state of the frictional element, predicts (S), prior to the start of the shift, a heat generation amount of the frictional element during the shift, predicts (S) a thermal load state of the frictional element upon shift completion on the basis of the current thermal load state of the frictional element and the predicted heat generation amount, determines (S, S, S) whether to permit or prohibit the shift on the basis of the predicted thermal load state upon shift completion, and halts the determination as to whether to permit or prohibit the shift, made on the basis of the predicted thermal load state upon shift completion, when a shift mode of the shift is a second shift mode in which the heat generation amount is smaller than that of a first shift mode.

Growing community of inventors

Sagamihara, Japan

Tomomasa Ikeda