
AUTOMATIC TRANSMISSION CONTROL SYSTEMS 273
Since the construction and operation of the torque
converter and epicyclic gearset have earlier received
individual attention, it now remains to explain the basic
operating principles of the hydraulic control system for
an automatic transmission.
17.2 HYDRAULIC CONTROL SYSTEMS
Functions of the hydraulic control system
The hydraulic control system of an automatic trans-
mission has to perform the following functions:
1 Fills and then maintains a constant flow of fluid under
pressure through the torque converter for efficient
transmission of torque.
2 Supplies fluid to a valve control body and governo ...