Toyota Jidosha Kabushiki Kaisha

Ryuji Chida

Yoshinobu Soga

Kenji Matsuo

Yusuke Ogata

Hirofumi Nakada

Tomokazu Inagawa

Kenichi Yamaguchi

Kazuaki Nakamura

Hiroshi Morioka

Takashi Yumoto

Hideaki Takahara

Masanori Shimizu

A vehicle power transmission device includes a forward first clutch between an engine and an input shaft of a continuously variable transmission, and a second clutch between an output shaft of the continuously variable transmission and driving wheels. When the hydraulic fluid of the hydraulic pump is not supplied to the first disconnection device and the second disconnection device, a dragging torque generated in the second disconnection device is larger than a dragging torque generated in the first disconnection device.

Vehicle power transmission device

A control apparatus for a continuously variable transmission includes a clamping force increase portion. The continuously variable transmission includes a pair of a primary pulley and a secondary pulley on which a transmission belt is wound. A shift of the continuously variable transmission is performed by changing effective diameters of the primary pulley and the secondary pulley. The clamping force increase portion increases a belt clamping force when it is determined that a torque capacity is decreased by determining that drive power input to the primary pulley is decreased by an amount equal to or larger than a predetermined amount while the secondary pulley is in a stopped state or a substantially stopped state, as compared to when it is determined that the torque capacity is not decreased.

Control apparatus, control method, and computer-readable storage medium for continuously variable transmission

A first orifice is provided in a first fluid passage upstream of a cooler, and a second orifice is provided in a second fluid passage. The flowrates of hydraulic fluid flowing through the first and second fluid passages are regulated by the first and second orifices, respectively, and are thus suppressed from becoming excessive. Also, the downstream side of the second fluid passage is connected to the first fluid passage between the first orifice and the cooler, and a lubrication passage is connected to the first fluid passage downstream of the cooler. Accordingly, the lubrication passage is a single passage and the cooler and the lubrication passage are arranged in series so the cooler flowrate and the lubrication flowrate are the same. As a result, the flowrate of hydraulic fluid that flows out from a secondary regulator valve to the upstream side of an oil pump can be increased.

Hydraulic pressure control apparatus for a vehicular power transmitting device

An ECU executes a program including the steps of, when an oil level adjustment mode is attained, executing control of the engine speed if an AT oil temperature is higher than an oil temperature threshold value T(), turning on a 'D' lamp of an indicator if the AT oil temperature is higher than an oil temperature threshold value T() and the AT temperature is lower than an oil temperature threshold value T(), flashing the 'D' lamp of the indicator if the AT oil temperature is higher than the oil threshold value T(), and executing normal engine speed control if the AT oil temperature is higher than an oil temperature threshold value T().

Control apparatus of vehicle incorporating automatic transmission

A fluid level of hydraulic fluid circulated in an automatic transmission is regulated while an internal combustion engine is running. When the fluid level is regulated, the hydraulic fluid is cooled, for example, by coolant passing through a radiator. In the cooling of the hydraulic fluid, the degree of cooling of the hydraulic fluid is controlled such that the temperature of the hydraulic fluid falls within an acceptable range. This prevents inaccurate fluid level regulation due to thermal expansion of the hydraulic fluid.

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Toyota, Japan

Ryuji Chida