Shift control system for automatic transmission

摘要

A throttle presure and a modified throttle pressure which is higher than the throttle pressure are developed and the spool of the 2-3 shift valve arranged to be biased toward its downshift position by the throttle pressure when in its upshift position and toward its downshift position by the modified throttle pressure when in its downshift position. The difference between the throttle pressure and the modified throttle pressure is arranged to increase as the level of the throttle pressure decreases.