Vorrichtung zur Schaltsteuerung eines Automatikgetriebes während des Herunterschaltens in einen Motorbremsbetriebszustand

摘要

A timing control for an overrunning clutch is disclosed. A revolution speed ratio of an input shaft revolution speed to an output shaft revolution speed is employed as a parameter reflecting the progress in a downshift initiated by a select operation to an engine braking range. When this ratio reaches a target value, a control unit generates an ON signal. In response to this ON signal, an overrunning clutch solenoid is energized to engage the overrunning clutch.