Control device of automatic transmission
AssigneeAisin Aw Co., Ltd.
InventorsHiroshi TSUTSUI, Yutaka Teraoka, Masatake Ichikawa, Shoji Omitsu
Life of this patent
Estimating the term…
Abstract
If it is determined that a D range is in use and determined that a vehicle is stopped, neutral control means (25) commands and controls an engagement pressure of a clutch (C-1) so as to achieve a state in which a piston of the clutch (C-1) 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 (SLC1) to a hydraulic oil chamber and fills the hydraulic oil chamber. There is thus no drag loss in the clutch (C-1) 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.
Claims6
-4. (canceled)
A control device of an automatic transmission that commands and controls a solenoid valve capable of adjusting and outputting an engagement pressure to be delivered to a hydraulic oil chamber of a hydraulic servo of a clutch that is engaged at start off, the control device comprising:
- a range determination unit that determines a shift range that includes a driving range;
- a vehicle stop determination unit that determines that a vehicle is stopped;
- and
- a neutral control unit that executes a neutral control that, when it is determined that the driving range is in use and determined that the vehicle is stopped, commands and controls the engagement pressure so as to achieve a state in which a piston of the clutch contacts a clutch drum by a biasing force of a spring, and a state in which oil fills an oil passage from the solenoid valve to the hydraulic oil chamber of the hydraulic servo of the clutch and fills the hydraulic oil chamber of the hydraulic servo of the clutch.
Dependencies are inferred from the claim text.