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AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHiroji Taniguchi, Katsumi Kono, Kenji Matsuo, Hideki Yasue, Tadashi Tamura, Daisuke Inoue, Yoshiaki Yamamoto, Hiroshi Morioka, Hiroki Kondo, Ryoji Habuchi
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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.
An apparatus for controlling a belt-type continuously variable transmission of a motor vehicle that is provided in a power transmission path, the transmission having an input shaft disposed on a power source side of the transmission, an output shaft disposed on a side of the transmission opposite from the power source side, a pair of pulleys mounted on the input shaft and the output shaft, respectively, and a torque transfer belt that is wound around the pulleys to effect power transmission by use of frictional force, the transmission having a continuously variable speed ratio, which is a ratio of a rotation speed of the input shaft to a rotation speed of the output shaft, the apparatus comprising a controller that:
A method of controlling a belt-type continuously variable transmission of a motor vehicle that is provided in a power transmission path, the transmission having an input shaft disposed on a power source side of the transmission, an output shaft disposed on a side of the transmission opposite from the power source side, a pair of pulleys mounted on the input shaft and the output shaft, respectively, and a torque transfer belt that is wound around the pulleys to effect power transmission by use of frictional force, the transmission having a continuously variable speed ratio, which is a ratio of a rotation speed of the input shaft to a rotation speed of the output shaft, the method comprising the steps of:
Dependencies are inferred from the claim text.