| 摘要 |
<p>This invention discloses an automatic transmission control system for an automobile, in which shift control for a specific gear shift is performed by especially controlling a hydraulic working pressure, so that a specific gear shift, such as a 2-3 gear shift which has a necessity of locking a specific friction coupling element is satisfactorily caused simultaneously with unlocking another specific friction coupling element. In the figure, the base pressure Pb is kept at a constant initial level of pressure Pb from an appearance of the gear shift command to a point of time at which the turbine speed starts to fall, i.e. at which an inertia phase starts and increases at a fixed rate after the commencement of the inertia phase. The feedback (Pfb) is established so as to bring the turbine speed change rate dNt into agreement with the target turbine speed change rate dNt, during the inertia phase after a passage of a specified time interval (T1) from the commencement of the inertia phase. Further, the learned pressure Psd is set on the basis of the state of an inertia phase in a previous 1-2 gear shift.</p> |
