Line pressure control system for an automatic transmission.

摘要

A microcomputer (Figure 2) is provided for controlling an automatic transmission for a motor vehicle. The microcomputer operates to control line pressure in a hydraulic circuit for the automatic transmission. A control circuit (45) is provided to respond to an output signal (37) of the microcomputer (Figure 2) for energizing a solenoid (56) to control the line pressure. A driving circuit (46) is provided to respond to closing operation of a starter motor switch (48) of an engine to energize the solenoid (50) to reduce the line pressure.