Toyota Jidosha Kabushiki Kaisha

Hiroshi Morioka

Hideki Yasue

Ryoji Habuchi

Hiroki Kondo

Katsumi Kono

Kenji Matsuo

Hiroji Taniguchi

Tadashi Tamura

Daisuke Inoue

Yuji Hattori

Yoshiaki Yamamoto

Shinji Kasuga

Yoshinobu Soga

Masami Sugaya

Shinya Kuwabara

Masabumi Nishigaya

Ryuji Chida

Shoichi Sayo

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.

Fluid level regulating method and fluid temperature regulator for automatic transmission

The continuously variable belt transmission is provided with a fixed sheave and a movable sheave provided on a secondary shaft, a first hydraulic chamber that presses the movable sheave in an axial direction, a second hydraulic chamber that gives the movable sheave a pressing force acting in a direction opposite the pressing force given by the first hydraulic chamber, an oil passage connected to the second hydraulic chamber, and an oil receiver disposed along a path from the oil passage to the second hydraulic chamber. The oil receiver is attached to the secondary shaft, a bearing and a bulkhead are disposed on both sides of the oil receiver, an oil passage is provided in the secondary shaft, and a grooved portion provided in the oil receiver connects the second hydraulic chamber and the oil passage.

Continuously variable belt transmission

A hydraulic control system including: a rotating speed raising unit for raising the rotating speed of the prime mover while the transmission is not rotated by the prime mover, to increase an output volume of the hydraulic pump; at oil pressure instructor for outputting a plurality of instruction signals of different pressure instruction values to the valve modulating mechanism while the output volume of the hydraulic pump is increased; an oil pressure detector for detecting the oil pressure to be modulated and fed to the transmission, at a plurality of pressure levels; and a learning corrector for learning and correcting the instruction signals on the basis of the outputted pressure instruction value and the detected oil pressure detected.

Hydraulic control system for transmissions

A hydraulic circuit cleaning apparatus has a hydraulic circuit that includes an oil pump, an oil passage to which the oil pressure ejected from the oil pump is supplied, and a pressure regulator device connected to the oil passage for regulating the oil pressure in the oil passage. The apparatus cleans the hydraulic circuit by using a cleaning liquid. A discharge oil passage is connected to a discharge port of the pressure regulator device, so that the cleaning liquid is discharged out of the hydraulic circuit via the discharge oil passage.

Hydraulic circuit cleaning apparatus and method

An apparatus and a method control a belt-type continuously variable transmission of a vehicle having a continuously variable speed ratio, which is a ratio of a rotation speed of an input shaft to a rotation speed of an output shaft. The speed ratio of the transmission is controlled by changing a groove width of each of the pulleys, and a belt clamping pressure applied to at least one of the pulleys to clamp the torque transfer belt also is controlled. Furthermore, the speed ratio of the transmission is set to a low-load speed ratio when it is determined that control of the belt clamping pressure has failed and the belt clamping pressure is raised to a high level. The low-load speed ratio is predetermined so that a load applied to the torque transfer belt is substantially minimized.

Control apparatus and method of belt-type continuously variable transmission

A shift control system for a continuously variable transmission, in which a road load on a vehicle is detected, the lower limit speed is set according to the detected road load, in which a target input speed, as set according to the running state of a vehicle, is restricted with the set lower limit speed, and in which the gear ratio of the continuously variable transmission is controlled so that the actual input speed may be equal to the target input speed restricted. The target input speed is restricted after the actual input speed is more than the lower limit value, when the road load is light, and said target input speed is restricted irrespective of the actual input speed when the road load is heavy.

Shift control system for continuously variable transmissions

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Toyota, Japan

Hiroshi Morioka