Jatco Corporation

Nissan Motor Company Limited

Kenichi Ooshima

Hiroki Matsui

Masato Tanaka

Takeshi Yamamoto

Hiroshi Miyazaki

Daisuke Nakagawa

Ikuo Hirose

Yuuji Saitou

Hidetoshi Tsukidate

Takefumi Suzuki

Tomoo Mochizuki

Yuji Torizawa

A select control device for an automatic transmission includes a select lever and a controller. The select lever is configured to select a range position in response to a select operation by a driver. The controller is configured to, when a first select operation from a first travel range position to a non-travel range position is performed, perform pressure release control that decreases at a prescribed descending gradient an engagement capacity of a starting clutch that is engaged in the first travel range position. The controller has a select hydraulic pressure control unit configured to continue the pressure release control during a second select operation from a second travel range position that is different from the first travel range position to the non-travel range position after the first select operation.

Select control device of automatic transmission

In a specific state where an electric vehicle is in a stop state and a creep torque is generate in an electric motor (), when a shift range is switched from a traveling range to a non-traveling range, a motor control section (B) performs a torque decrease control to stepwisely decrease the creep torque of the electric motor (), and an automatic transmission control device () performs a disengagement control to gradually disengage the frictional engagement element of the automatic transmission ().

Electric-vehicle control device and control method

A temperature warning method of a friction element for issuing a warning depending on temperature of the friction element arranged between a power source and a driving wheel, includes issuing the warning when the temperature of the friction element exceeds an upper limit temperature, and making a period of time, from when the temperature of the friction element exceeds the upper limit temperature until when the warning is issued, longer when the temperature of the friction element exceeds the upper limit temperature for a first time than when the temperature of the friction element exceeds the upper limit temperature for a second or subsequent time.

Temperature warning device and temperature warning method of friction element

There is provided a control apparatus for an automatic transmission AT into which driving forces from driving sources including an engine Eng and a motor/generator MG are inputted. The control apparatus includes: a second brake Bengaged in a D range; an engagement start determining section (steps S&#x2192;S&#x2192;S); and a determination inhibit section (steps S&#x2192;S&#x2192;S). The engagement start determining section determines that second brake Bhas started the engagement in a case where a load of the motor/generator MG is increased by a predetermined quantity during the revolution number control and when the D range is selected and second brake Bin the release state is engaged. The determination inhibit section inhibits the engagement start determination in a case where a switching from an HEV mode to an EV mode occurs.

Control device for automatic transmission

A system for controlling a torque reduction at shifting for an automatic transmission is provided with actual gear-ratio detecting means for detecting an actual gear ratio out of input rotation and output rotation of the automatic transmission, and torque-reduction amount computing means for calculating a torque-reduction amount out of a torque-reduction set gain set previously, which is a rate of change of the torque-reduction amount with respect to a change in gear ratio, and the detected actual gear ratio. With this, the start and completion timings of torque-reduction control can be optimized to prevent elongation of shifting. This results in enhancement in the shift quality and in the endurance reliability of a friction material for shifting.

Growing community of inventors

Isehara, Japan

Kenichi Ooshima