Jatco Corporation

Nissan Motor Company Limited

Takashi Koguchi

Makoto Komatsu

Sho Okutani

Hiroyasu Tanaka

Takuichiro Inoue

Toshiaki Noda

Hideshi Wakayama

Shin Tsukamoto

Takahiro Yamada

Shohei Imaji

Yuuji Nagase

Takehiro Iizumi

Takashi Nobukawa

Jongkeun Lim

Yoshiyuki Egawa

Kazunori Sugiura

Kenji Hishida

Yuichi Ishiyama

A control device for a lock-up clutch includes a control unit, an abnormality determination unit, a release control unit and a prohibition unit. The control unit is configured to control an engagement state of a lock-up clutch, and to perform a slip lock-up control by performing a feedback control of an engagement hydraulic pressure to be a first slip amount during coasting. The abnormality determination unit is configured to determine an abnormality when a state continues with a slip amount being equal to or greater than a second slip amount. The release control unit is configured to release the lock-up clutch when the abnormality is determined. The prohibition unit is configured to allow the control unit to raise the engagement hydraulic pressure by a prescribed pressure, and to prohibit determination by the abnormality determination unit, when the transmission ratio is downshifted during coasting while the slip lock-up control is performed.

Control device and control method for lock-up clutch

A vehicle has an engine () as a driving source. Output rotation of the engine () is transmitted to driving wheels () through a torque converter () equipped with a lock-up clutch, a first gear train (), a transmission () formed by combination of a variator () and an auxiliary transmission (), a second gear train () and a final speed reduction device (). The second gear train () is provided with a parking mechanism () that mechanically locks an output shaft of the transmission () so that the output shaft of the transmission () cannot rotate during parking of the vehicle. A shift speed when down-shift is performed by the variator () during a torque-down request to the engine () is set to be slower than a shift speed when down-shift is performed by the variator () during a non-torque-down request.

Apparatus and method for controlling continuously variable transmission

As a mode switching shift line when a sub-transmission mechanism is switched from a first-speed to a second-speed, a first mode switching shift line, which prioritizes a learning of a hydraulic pressure with which a Low brake starts to slip and a learning of a hydraulic pressure with which a High clutch starts to transmit a torque, or a second mode switching shift line, which is a shift line in a Low side with respect to the first mode switching shift line and prioritizes a fuel efficiency of an engine is selected, and the sub-transmission mechanism is switched from the first-speed to the second-speed on the basis of the selected mode switching shift line.

Control device for continuously variable transmission and control method of the same

An automatic transmission control device implements a downshift by disengagement of a clutch that is engaged in a gear position before the downshift. It is determined whether an engine state is in a predetermined region in which a change of an engine torque per a change of an accelerator pedal opening is smaller than that in another region, and the engine torque is within a predetermined range, and an engine rotational speed is within a predetermined range. It is determined whether an operating state is in a predetermined state of accelerator operation in which the accelerator pedal opening is larger than a predetermined value, and an accelerator pedal opening change rate has an absolute value smaller than a predetermined value. The downshift is inhibited in response to determination that the engine state is in the predetermined region and the operating state is in the predetermined state of accelerator operation.

Automatic transmission control device

Engine output control apparatus has shift range detecting section detecting shift range of automatic transmission; vehicle speed detecting section detecting vehicle speed; engine output state detecting section detecting engine output state; and controller. The controller performs (a) judgment control judging that torque converter is in a stall state if following judgment conditions (i) to (iii) are satisfied, (i) shift range is drive range, (ii) vehicle speed is equal to or less than predetermined vehicle speed, (iii) engine is in a high output state, (b) cumulation control cumulating a period of agreement of the judgment conditions if the judgment conditions are satisfied, and (c) output suppression control suppressing output of the engine if a control start condition is satisfied by cumulation of the agreement period. The control start condition is set so that as the vehicle speed becomes higher, start of the output suppression control is more delayed.

Output control apparatus of engine

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Yokohama, Japan

Takashi Koguchi