Toyota Jidosha Kabushiki Kaisha

Susumu Moritomo

Norihiro Tsukamoto

Satoshi Kato

Masakazu Owatari

Shinya Toyoda

Sei Kojima

Makoto Sawada

Keita Sasaki

Yuki Murakami

Satoshi Kamijo

Kengo Nagai

A control apparatus for a vehicle drive-force transmitting apparatus which includes a gear mechanism and a continuously-variable transmission mechanism and which establishes selectively a first state in which a drive force is transmitted by the gear mechanism and a second state in which the drive force is transmitted by the continuously-variable transmission mechanism. The control apparatus sets a shift-up-action permitted gear ratio of the continuously-variable transmission mechanism, which makes a state-switch-requiring shift-up action is permitted to be executed. When a running speed of the vehicle is not higher than a given value, a predetermined high gear ratio value is set as the shift-up-action permitted gear ratio. When the running speed is higher than the given value, a predetermined gear ratio range ranging from the predetermined high gear ratio value to a predetermined low gear ratio value is set as the shift-up-action permitted gear ratio.

Control apparatus for vehicle drive-force transmitting apparatus

A control apparatus for a vehicle drive-force transmitting apparatus which establishes selectively a first state in which a drive force is transmitted by a gear mechanism and a second state in which the drive force is transmitted by a continuously-variable transmission mechanism. The control apparatus executes a shift-up action requiring the first state to be switched to the second state, in (a) a case in which a state of the drive-force transmitting apparatus satisfies a first condition that a gear ratio of the continuously-variable transmission mechanism is not lower than a first gear ratio value and in (b) a case in which the state of the drive-force transmitting apparatus satisfies a second condition that a lap-down control is executed with the gear ratio of the continuously-variable transmission mechanism being not lower than a second gear ratio value that is lower than the first gear ratio value.

A control system for a vehicle transmission is provided. The control system includes an electronic control unit. The electronic control unit is configured to, when control for engaging the at least one engaging device that switches power transmission to power transmission via a first power transmission mechanism and control for increasing hydraulic pressure that is applied to a continuously variable transmission are required, control the continuously variable transmission and the at least one engaging device so as to start control for engaging the at least one engaging device first and, after a lapse of a predetermined time from the start of control for engaging the at least one engaging device, start control for increasing hydraulic pressure that is applied to the continuously variable transmission.

Control system for vehicle transmission

An ECU executes a program including the steps of: learning a differential pressure of a lock-up clutch; determining whether or not learning has been completed when a vehicle is in a coasting state and a brake is applied; lowering the lock-up differential pressure such that the lock-up clutch can be disengaged immediately and prohibiting or suppressing control for increasing transmission gain when learning has been completed; and increasing a lower limit guard value for the lock-up differential pressure and performing control for increasing the transmission gain when learning has not been completed.

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Toyota, Japan

Susumu Moritomo