Jatco Corporation

Nissan Motor Company Limited

Fumito Shinohara

Hideaki Suzuki

Takuichiro Inoue

Yoshihisa Kodama

Toshiyuki Shibuya

Tetsuya Izumi

Toshiji Iida

Midori Yamaguchi

Hironori Nihei

Seonjae Kim

Yoshio Yasui

Yuuji Nagase

Hiroyasu Tanaka

Hiroyuki Suzuki

Seiichiro Takahashi

Yusuke Kimura

Mamiko Inoue

Ryousuke Nonomura

Atsufumi Kobayashi

Masato Mori

Yuji Okamoto

Kiyotaka Sawano

Tatsuya Ozone

Norio Asai

Koutarou Tagami

Satoru Ishii

Takashi Nobukawa

Takuya Numata

Disclosed is a control device for a continuously variable transmission () that has, as forward speed change stages, a first speed change stage () and a second speed change stage (). The control device comprises a coordinated speed change means () that carries out a coordinated speed changing in such a manner that when the speed change stage of an auxiliary transmission mechanism () is about to be changed, a speed change speed of the auxiliary transmission mechanism () is coordinated with a variator () and the variator () is controlled to carry out a speed change in a direction opposite to that of the auxiliary transmission mechanism () while carrying out the speed change operation of the auxiliary transmission mechanism (), and a torque control means () that carries out a torque regulating control during the coordinated speed changing under up-shifting by the coordinated speed change means, the torque regulating control being a control for effecting a torque-up operation to a driving source () after effecting a torque-down operation to the driving source and including a timing through which a starting time point of a drive force gap caused by the coordinated speed changing is advanced and a timing through which an ending time point of the drive force gap is delayed.

Control device for continuously variable transmission

A transmission controller executes synchronization shift of shifting a variator in a direction opposite to a speed ratio change direction of a sub transmission mechanism when shifting a sub transmission mechanism. When a gear position of the sub transmission mechanism is at the second gear position and an output increase request of a power source is made, the transmission controller prohibits the synchronization shift and shifts only the sub transmission mechanism from a second gear position to a first gear position.

Continuously variable transmission and method of controlling the same

A first determining unit configured to determine whether the indicated pressure of a primary pulley pressure has become a line pressure during an up shift, an indicated pressure control unit configured to make the indicated pressure of the primary pulley pressure alone higher than the line pressure when the target shift rate is determined to be equal to or lower than a predetermined shift rate and the speed ratio is determined not to have become the target speed ratio, and an estimated time detecting unit configured to detect a predetermined time it takes until the primary pulley pressure can be regarded as being equal to the line pressure after the target shift rate is determined to be equal to or lower than the predetermined shift rate, and the indicated pressure of the primary pulley pressure is made higher than the line pressure, are provided, and the indicated pressure control unit is configured to calculate the deviation between the indicated pressure of the primary pulley pressure and indicated pressure of the line pressure after the estimated predetermined time is over, and control transmission of a continuously-variable transmission while maintaining the deviation after the predetermined time is over.

Continuously-variable transmission and continuously-variable transmission control method

A continuously-variable transmission, which has a first pulley, which has a first fixed pulley and a first mobile pulley, a second pulley, which has a second fixed pulley and a second mobile pulley, and a drive force transmitting member, which is stretched between the first pulley and the second pulley, is provided, and this continuously-variable transmission has an indicated pressure calculation section, which calculates the indicated pressure of the first pulley, a stroke speed calculation section, which calculates the stroke speed of the first mobile pulley, and an oil pressure calculation section, which, when oil is discharged from an oil chamber, calculates the amount of increase of oil pressure in a first pulley oil chamber that increases compared to the indicated pressure due to the channel resistance of the discharge path, based on the channel resistance and the stroke speed, and a correction section, which, when oil is discharged from the first pulley oil chamber, subtracts the amount of increase of oil pressure from the first pulley pressure based on a target speed ratio and input torque, and corrects the indicated pressure of the first pulley.

In a speed ratio control device for a belt continuously variable transmission according to this invention, when a speed ratio is subjected to feedback control on the basis of a difference between an actual speed ratio and a target speed ratio, pressure supplied to a primary pulley is corrected through feedforward (S, S) in order to suppress variation in the groove width of the primary pulley caused by a rapid variation in an input torque into the primary pulley (S) while traveling in a fixed speed ratio mode (S) in which the target speed ratio is held at a fixed value.

Speed ratio control device and method for belt type continuously variable transmission

In a line pressure control device for a belt type continuously variable transmission according to this invention, when a line pressure is feedback-controlled to equal a target line pressure which is equal to or greater than the larger of oil pressures supplied to a primary pulley and a secondary pulley (S), and it is determined that the target line pressure has fallen below a first low pressure, leading to a divergence between the target line pressure and the actual line pressure (S), the target line pressure is restricted such that the target line pressure does not fall below a lower limit value (S).

Line pressure control device and method for belt type continuously variable transmission

A speed ratio change control device for a belt type continuously variable transmission calculates a maximum thrust that can be generated by the primary pulley on the basis of an upper limit value of the line pressure, calculates an upper limit value of a shift speed on the basis of the maximum thrust, and sets the target speed ratio on the basis of the upper limit value of the shift speed.

Speed ratio change control device and method for belt type continuously variable transmission

A control apparatus for an automatic transmission includes a control section having a normal control section configured to actuate the step motor at a first speed by using a feedback control including an integral control in accordance with the target pulley ratio and the actual pulley ratio, a high speed control section configured to actuate the step motor at a second speed higher than the first speed by an open loop control based on the target pulley ratio, a judgment section configured to judge whether there is a high speed operation request, and a switch section configured to select the normal control performed by the normal control section at a normal condition, and to switch to the high speed control when a switch start condition is satisfied, the switch start condition including a first condition that the judgment section judges there is the high speed operation request.

Control apparatus for continuously-variable transmission of vehicle

Growing community of inventors

Mishima, Japan

Fumito Shinohara