HYDRAULISCHES STEUERSYSTEM FUER EIN AUTOMATISCHES KRAFTFAHRZEUGGETRIEBE

摘要

In a hydraulic control system of an automatic power transmission is provided a first-second gear shift valve which is to be acted upon through only one fluid inlet port by a signal fluid pressure representative of a manual first forward drive range selected at the manually operated gear shift lever, the port being used not only as the port to receive the signal fluid pressure but as a switching port so that the shift valve is conditioned to produce the first gear in the transmission mechanism in the presence of the signal fluid pressure.