Toyota Jidosha Kabushiki Kaisha

Nippon Ketjen Co., Ltd.

Akzo Nobel N.v.

Albemarle Netherlands B.v.

Akira Hino

Hiroki Kondo

Atsushi Ayabe

Daisuke Inoue

Kenji Matsuo

Mitsuhiro Fukao

Tadashi Tamura

Shinya Toyoda

Motonori Kimura

Naoto Tanaka

Yasunari Matsui

Akihide Ito

Shuhei Ishikawa

Hiroya Fujiwara

Satoshi Abe

Takuro Shimazu

Wataru Matsubara

Takashi Yumoto

Katsumi Kono

Michio Yoshida

Takaaki Tokura

Hiroji Taniguchi

Hirofumi Nakada

Hiromitsu Nitani

Yusuke Ohgata

Sei Kojima

Kazuya Sakamoto

Naoya Inoue

Katsuhisa Fujita

Masato Matsubara

Kazuya Ishiizumi

Masato Kaigawa

Hitoshi Matsunaga

Hideki Takamatsu

Koji Hattori

Makoto Sawada

Kyohei Suzumura

Tsuyoshi Fujikane

Mitsuhiro Toyoda

Shun Minaki

Masahiro Tawara

Masafumi Shimowake

Shojiro Suga

Mark De Boer

Hirofumi Sato

Yasuhito Takahashi

A control apparatus for controlling a linear solenoid by controlling a driving current supplied to the linear solenoid through a feedback control. The feedback control is executed by a feedback control system having parameters that are determined in accordance with an ILQ design method. In a frequency characteristic of a gain of a transfer function representing a ratio of an output to a disturbance in the feedback control system, the gain is lower than 0 [dB] throughout all frequency ranges.

Control apparatus for linear solenoid

A control device of a vehicle with a stepped automatic transmission has: a gradient acquiring part; a driving force calculating part; a future change estimating part; and a shift control part. The shift control part prohibits change of the gear stage when the speed of change of the speed or acceleration of the vehicle in the future if the maximum driving force applied, is within a reference range of speed of change where the occupants would not notice a change in speed or acceleration, and permits change of the gear stage when the speed of change of the speed or acceleration of the vehicle in the future if the maximum driving force applied, is outside the reference range of speed of change.

Control device of vehicle

At the time when a hydraulic actuator is operated to engage a dog clutch, after it is detected that a hydraulic pressure for operating the hydraulic actuator is higher than or equal to a predetermined hydraulic pressure, it is determined whether the dog clutch is not engaged. Therefore, non-engagement determination due to insufficient hydraulic pressure for operating the hydraulic actuator is prevented. Thus, at the time when the hydraulic actuator is operated to engage the dog clutch, it is possible to prevent consumption of time to engage the dog clutch due to unnecessary re-engagement operation.

Control apparatus for power transmission system

A control apparatus for a vehicular drive unit is provided. The vehicular drive unit includes a continuously variable transmission, and a clutch. The control apparatus includes an electronic control unit that is configured to acquire an oil temperature of hydraulic oil for controlling the continuously variable transmission and the clutch, and control the clutch such that a torque capacity of the clutch becomes smaller than a torque capacity that is set in a case where an oil temperature of the hydraulic oil is higher than a predetermined oil temperature, when the oil temperature is equal to or lower than the predetermined oil temperature, or control the continuously variable transmission such that a speed ratio of the continuously variable transmission becomes equal to or larger than a lower limit set in advance when the oil temperature of the hydraulic oil is equal to or lower than the predetermined oil temperature.

Control apparatus for vehicular drive unit

A clutch mechanism is configured to selectively change between a first power transmission path and a second power transmission path. The first power transmission path is configured to transmit torque to an output shaft via a transmission mechanism. The second power transmission path is configured to transmit the torque to the output shaft via a continuously variable transmission mechanism. An electronic control unit is configured to: (a) selectively change a power transmission path during traveling to one of the first power transmission path and the second power transmission path by controlling the clutch mechanism; and (b) in changing the power transmission path by controlling the clutch mechanism, control an operating point of the internal combustion engine during a change of the power transmission path so that the operating point crosses over an optimum fuel, consumption line of the internal combustion engine.

Vehicle driving system, control apparatus for vehicle driving system, and control method for vehicle driving system

In a control device for a vehicle including: a dog clutch mechanism that is disposed in a power transmission path in which a driving force is transmitted from an engine to a wheel and is operated by a hydraulic actuator; and an electric oil pump that supplies hydraulic pressure to the hydraulic actuator, rotation of the engine is stopped in a state in which the dog clutch mechanism is engaged by the hydraulic pressure supplied from the electric oil pump at a time during an engine stop operation, the rotation of the engine is started in the state in which the dog clutch mechanism is engaged by the hydraulic pressure supplied from the electric oil pump at a time during an engine restart operation, hence occurrence of up-lock of the dog clutch mechanism is prevented.

Vehicle control device and control method

In a region in which a rate of change in slip ratio of a transmission belt with respect to a change in input torque exceeds a permissible slip ratio rate of change set in advance, a steep change in the slip ratio is suppressed by limiting the rate of change in the input torque.

Driving system for vehicle

Vehicle control system and method provided to change speed ratio smoothly when switching a power transmission route from a route including a geared transmission to a route including a continuously variable transmission. Vehicle control system applied to a vehicle comprising: continuously variable transmission for changing speed ratio continuously is disposed between input shaft and output shaft; geared transmission is disposed parallel to the continuously variable transmission, and is adapted to establish speed ratio that cannot be established by continuously variable transmission; and friction clutch is brought into engagement to switch torque transmission route from a route including the geared transmission to a route including the continuously variable transmission. Vehicle control system configured to start speed change operation of continuously variable transmission before the friction clutch is brought into engagement completely when switching torque transmission route from the route including the geared transmission to the route including the continuously variable transmission.

Vehicle control system and vehicle control method

A power transmission system includes a first transmission provided in a first power transmission path, a second transmission provided in a second power transmission path, a first engagement device, a second engagement device, a third engagement device, a fail-safe valve, and an electronic control unit. The third engagement device selectively connects or interrupts one of the first and second power transmission paths. The electronic control unit is configured to, during traveling in a state where the third engagement device is released, output hydraulic pressure commands for simultaneous engagement of the first engagement device and the second engagement device. The electronic control unit is configured to, when it is determined that both the first engagement device and the second engagement device are engaged, prohibit traveling using the one of the first and second power transmission paths which is selectively connected or interrupted by the third engagement device.

Power transmission system

In a vehicle in which a continuously variable transmission and a gear mechanism are provided in parallel on a power transmission pathway between an input shaft and an output shaft, (i) an electronic control unit performs CVT shifting, in view of shift characteristics of C to C shifting in which the speed ratio is changed in stages, or (ii) then electronic control unit performs C to C shifting, in view of shift characteristics of CVT shifting in which the speed ratio is steplessly changed.

Control system for vehicle

When neutral control is started by placing a CVT drive clutch in a semi-engaged state while a vehicle is decelerating in a state where a second power transmission path is established, a clutch mechanism that is semi-engaged in neutral control while the vehicle is decelerating is changed from the CVT drive clutch to a forward clutch before a stop of the vehicle, so it is possible to continue the neutral control until a stop of the vehicle. At a stop of the vehicle, a power transmission path is already changed to a first power transmission path that establishes a gear ratio (EL) higher than a highest gear ratio (&#x3b3;max) that can be established by the second power transmission path. Thus, right after a stop of the vehicle, it is possible to execute idle stop control.

Control apparatus for vehicle

A vehicle drive control device in a vehicle including an engine comprising a throttle valve and a supercharger with an air bypass valve changed from a closing side to an opening side when a closing speed of the throttle valve is higher than a speed determination value, the vehicle drive control device providing a torque-down control of the engine by operating the throttle valve to a closing side, wherein at the time of provision of the torque-down control of the engine in which the throttle valve is operated to the closing side when a rotation speed of the engine is equal to or greater than a predetermined rotation speed and a speed ratio of a torque converter is equal to or less than a predetermined value in a supercharged state, the throttle valve is caused to perform a closing operation at the closing speed lower than the speed determination value.

Vehicle drive control device

A control apparatus for a vehicle includes an engine, a dog clutch and a friction clutch. The dog clutch is configured to transmit power or interrupt transmission of power in a power transmission path that transmits power of the engine to a drive wheel. The dog clutch includes a synchromesh mechanism. The friction clutch is configured to transmit power or interrupt transmission of power in the power transmission path between the engine and the dog clutch. The control apparatus includes: an electronic control unit. The electronic control unit is configured to, when the synchromesh mechanism is operated in order to engage the dog clutch in a state where the vehicle is stopped and the friction clutch is released, increase a rotation speed of the engine as compared to when the synchromesh mechanism is not operated.

A control device for a vehicle includes a transmission mechanism capable of setting a fixed transmission gear ratio, a continuously variable transmission provided in parallel with the transmission mechanism, and a path switching mechanism for selectively blocking a torque transmission path that includes the transmission mechanism and that is configured to dampen vibration. The control device further includes a clutch mechanism where the continuously variable transmission and the transmission mechanism capable of setting constant transmission gear ratio are arranged in parallel between an input shaft and the output shaft, that selectively connects torque transmission path stretching from an internal combustion engine to drive wheels via transmission mechanism, and one clutch and other clutch are arranged in series, the other clutch is arranged on a relatively downstream side. A control unit is configured to engage one clutch in a case where torque is transmitted from the internal combustion engine to the drive wheels via the continuously variable transmission.

Control device for vehicle

A hydraulic control system for a vehicle having a continuously variable transmission in which a torque transmitting capacity thereof is changed hydraulically, and an engagement device which is connected to the continuously variable transmission in series and in which a torque transmitting capacity thereof is changed hydraulically. The hydraulic control system comprises a selecting means that selects a command pattern for setting an engagement pressure of the engagement device out of a plurality of patterns when an initial pressure is lower than a steady pressure for a normal running of the vehicle. The selecting means is configured to select the command pattern in such a manner that the torque transmitting capacity of the engagement device does not exceeds the torque transmitting capacity of the continuously variable transmission, based on at least any of conditions of the initial pressure that is lowered to be lower than the steady pressure, and a rotational speed of the continuously variable transmission.

Hydraulic control system for vehicle

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Toyota, Japan

Akira Hino