Aisin Aw Co., Ltd.

Shoji Omitsu

Hiroshi Tsutsui

Yutaka Teraoka

Masatake Ichikawa

If it is determined that a D range is in use and determined that a vehicle is stopped, neutral control means () commands and controls an engagement pressure of a clutch (C-) so as to achieve a state in which a piston of the clutch (C-) contacts a clutch drum by a biasing force of a spring, and a state in which oil fills an oil passage from a linear solenoid valve (SLC) to a hydraulic oil chamber and fills the hydraulic oil chamber. There is thus no drag loss in the clutch (C-) during a neutral control, and the same fuel economy as when, for example, a manual shift to the neutral range is made can be achieved during the neutral control.

Control device of automatic transmission

A control apparatus of an automatic transmission including a start intended operation detecting unit detecting a vehicle starting operation; and a clutch control unit engaging the clutch from the clutch disengaged state and the automatic speed change mechanism is placed in a neutral state, when the vehicle starting operation is detected. The clutch control unit includes an initial engagement control unit performing initial engagement control that starts frictional contact of the clutch by supplying hydraulic pressure to a hydraulic servo of the clutch, and a slip start control unit establishing a speed ratio of the automatic speed change mechanism at the start by slip-controlling the clutch after the initial engagement control is terminated, thereby increasing output shaft rotational speed of the automatic speed change mechanism without reducing the input shaft rotational speed of the automatic speed change mechanism to less than the input shaft rotational speed at the end of initial engagement control.

A control apparatus of an automatic transmission having an automatic speed change mechanism for changing a driving source speed of rotation and a clutch engaged at a start, a fluid transmission apparatus between the driving source and the automatic speed change mechanism, and a lock-up clutch for locking up the fluid transmission apparatus. The control apparatus includes a range unit that determines a shift range including a drive range, a vehicle stop unit that determines a stop of a vehicle, a start intended operation unit that detects an intended start vehicle operation, a clutch control unit that controls the clutch to be disengaged to place the automatic speed change mechanism in a neutral state while the shift range is determined to be the drive range and the vehicle is determined to be stopped, and performs engagement control of the clutch to control the start of the vehicle when the operation intended for starting the vehicle is detected, and a lock-up clutch control unit that controls the lock-up clutch to be engaged while the shift range is determined to be the drive range and the vehicle is determined to be stopped, and controls the lock-up clutch so that the lock-up clutch is at least engaged in a slip region in which a predetermined torque capacity is obtained, when the operation intended for starting the vehicle is detected.

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Toyota, Japan

Shoji Omitsu