Automatic transmission ratio control operable by manual commands - affords third operational mode involving prodn. of signals for changing up and down with gear lever

摘要

A hydraulic pressure control coil (44), a locking coil (56), two gear-shift coils (64,66) and an overdrive engagement coil (82) are energised through an interface (316) from a control computer (313). Signals are applied from sensors of engine and gearbox input and output shaft speeds (301; 309, 302), throttle flap position (303), selector lever position (304) and lubricant temp. (308). Switches provide for kickdown (305), idling (306), full throttle (307), overdrive (310), operational mode selection (391), and manual gear changes, up (393) and down (395)- not effective in either automatic mode. ADVANTAGE - Manual operation of automatic gearbox is simplified as alternative to automatic economical or ''sporty'' driving.