Toyota Jidosha Kabushiki Kaisha

Other

Aisin Aw Co., Ltd.

Toshimitsu Sato

Hiromichi Kimura

Naoyuki Sakamoto

Atsushi Ayabe

Kazuyuki Watanabe

Noboru Shibata

Mitsuhiro Nakamura

Hideaki Ogasawara

Shinji Kato

Toshio Sugimura

Hisanori Nomoto

Yasuo Hojo

Yoshiharu Harada

Kazuaki Nakamura

Masami Kondo

Keisuke Ota

Masayasu Mizobuchi

Koji Hattori

Tatsuya Kawamura

Takahiro Kondo

Tomohiro Kondo

Ryuji Imai

Tsuyoshi Sato

Masumi Wada

Kentarou Okada

Mamoru Kurosawa

In one embodiment, a hydraulic pressure control circuit () of an automatic transmission includes a mechanical oil pump (MOP) and an electrical oil pump (EOP). The discharge side of the electrical oil pump (EOP) is caused to be in communication with the direct upstream side of a hydraulic pressure servo of a first clutch (C) via a shunt hydraulic pressure supply passage (). At the time of idle reduction, a linear solenoid () on the upstream side of the first clutch (C) is caused to enter a forced closure state, thus preventing oil from the electrical oil pump (EOP) from flowing to a manual shift valve () side.

Hydraulic pressure supply control apparatus for automobile

In a frictional engagement apparatus that includes a clutch drum, separator plates, a clutch hub, and friction plates, a plurality of concave portions that dip inward in the plate thickness direction and a plurality of convex portions that protrude outward in the plate thickness direction are formed on an edge of the separator plates and/or a an edge of the friction plates, with each convex portion being arranged between two adjacent concave portions. Ridge lines of the concave portions and the convex portions pass through positions away from a center point of the separator plates and/or the friction plates.

Frictional engagement apparatus

A hydraulic control apparatus of an automatic transmission estimates the possibility of there being a demand for a shift into a gear lower than the current gear during a power-off downshift operation. If there is a possibility that there will be a demand for a shift into the next gear during the shift, the hydraulic control apparatus starts an operation for supplying an apply preparation hydraulic pressure in preparation for the shift into that next gear.

Hydraulic control apparatus and hydraulic control method for automatic transmission

When an N position sensor is ON, even though the N position is selected, the oil pressure supplied to a clutch Cwhich is engaged during the transition from the non-running state to the running state is raised in advance to a predetermined oil pressure; and, if a running request is detected when a D position decision has not been made, irrespective of whether or not a shift lever has been shifted from its N position to its D position, first speed starting off from rest control is performed, in which the oil pressure supplied to the clutch Cis raised to an oil pressure at which the clutch Cis capable of power transmission.

Control device and control method for automatic transmission

Since there are provided an inertia phase final period decision unit which decides whether or not the final period of the inertia phase of a speed change is currently occurring, a return control unit which, taking an affirmative result of this decision as a starting condition, performs return control in order to return from the torque down control by gradually decreasing the amount of decrease of output torque, a speed change progression decision unit which, during this return control from the torque down control, decides whether or not the speed change is progressing, and a resumption control unit which resumes the torque down control if the result of this decision is negative, accordingly, during the return control from the torque down control, by resuming the torque down control when there is no progression with the speed change.

Speed change control device and speed change control method for automatic transmission for vehicle

An ECU cuts off a fuel supply to an engine when a vehicle is decelerating. The ECU sets the cancellation of the fuel supply cut-off based on the target idle speed of the engine such that the power transfer state is prevented from switching from an engine driven state to an engine drive state even if the fuel supply to the engine is restarted. When the running condition of the vehicle satisfies the cancellation condition, the ECU then cancels the fuel supply cut-off to restart the fuel supply to the engine.

Control device and control method for vehicle

A shift control apparatus of an automatic transmission of a motor vehicle to which torque is transmitted from an engine via a fluid coupling device is provided. In the automatic transmission including a plurality of hydraulically operated friction elements, a clutch-to-clutch downshift is carried out during coasting of the vehicle by releasing one of the friction elements and engaging another friction element. A controller of the shift control apparatus detects a difference between input and output rotation speeds of the fluid coupling device, and increases an engine speed by a controlled amount based on the difference between the input and output rotation speeds when the clutch-to-clutch downshift is carried out during coasting of the vehicle, so that the vehicle is brought into a minimal driving state in which the engine speed is slightly higher than the output rotation speed of the fluid coupling device.

Shift control apparatus of automatic transmission of motor vehicle

A duty ratio for controlling an engagement force of a friction engagement device on the side of upshift engagement is corrected by an amount corresponding to an intermediate correction control value in the course of the shift. In addition, on a prerequisite condition that learning correction of a constant standby pressure control value at the start of the shift is converged, learning correction is performed for the intermediate correction control value according to a gradient of a turbine speed. Thus, a shift shock is prevented from occurring due to abrupt engagement of the friction engagement device and the like at the completion of the shift.

Vehicle shift control device and control method therefor

An apparatus for controlling ignition timing during a shift in a vehicular automatic transmission is provided that is capable of suppressing shift shock in the event that input torque of the automatic transmission is affected by external changes, such as changes in fuel and air pressure and the like, by adjusting immediately to those changes. This control apparatus is provided with an ignition timing controller that controls an ignition timing retard amount; a calculator that calculates a basic retard amount; a detector that detects an engine retard amount; a determinator that determines a retard correction value based on a shift mode of the automatic transmission and the like; and a corrector that corrects the ignition timing retard amount of the controller based on the retard correction value, the basic retard amount, and the engine retard amount.

Apparatus and method for controlling ignition timing during shift in vehicular automatic transmission

When it has been determined that control for a predetermined upshift has been started while an accelerator pedal was not being depressed, and that a factor that changes an input torque of an automatic transmission has been generated, an engaging pressure of a predetermined hydraulic frictional engagement device is corrected by a correction amount in accordance with the factor that changes the input torque. As a result, undershooting of an engine speed, as well as shift shock which results from that undershooting, is able to be preferably suppressed.

Hydraulic pressure control apparatus for vehicular automatic transmission and control method for hydraulic frictional engagement device of vehicular automatic transmission

In a vehicle in which a moderate throttle opening degree control of maintaining a degree of throttle opening that is less than a degree of throttle opening that corresponds to an accelerator operation is performed for a predetermined period following a beginning of the accelerator operation, if it is determined that a clutch-to-clutch downshift judgment has been made, the reduction of the engaging pressure of a disengage-side friction engagement device is restrained until it is determined that the moderate throttle opening degree control has ended. Therefore, even if the turbine torque is returned to a normal value at the end of the moderate throttle opening degree control, insufficient engaging torque is avoided, and the takeover of engaging torque for the clutch-to-clutch downshift is smoothly performed while the turbine torque is stable. Hence, occurrence of a shock related to the end of the moderate throttle opening degree control is suitably prevented.

Downshift control apparatus of vehicular automatic transmission, and control method thereof

Control device and control method for a vehicular automatic transmission

When a current downshift is determined to be a multiple downshift, it is determined whether or not a torque down during a first downshift is in a condition of interfering with learning performed for stabilizing the downshift operation during a second downshift is executed. If the torque down during the first downshift is determined to be in the condition of interfering with the learning, the learning is prohibited.

Shift control device and shift control method for vehicular automatic transmission

Apparatus for controlling a vehicle drive system including a drive power source, a fluid-operated power transmitting device connected to the drive power source, and an automatic transmission for transmitting a rotary motion of the fluid-operated power transmitting device to vehicle drive wheels such that a speed ratio of the automatic transmission is variable, the apparatus being arranged to increase an output of the drive power source for increasing its speed upon a shift-down action of the automatic transmission so as to increase its speed ratio during a coasting run of the vehicle, and including an output controlling element operable to control the output of the drive power source, and a gradually output increasing device operable upon the shift-down action during the coasting run, for controlling the output controlling element so as to gradually increase the speed of the drive power source at a predetermined rate.

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Toyota, Japan

Toshimitsu Sato