HYDRAULIC TRANSMISSION STAGE CONTROLLER OF AUTOMATIC TRANSMISSION

摘要

A shift limiting valve (110) driven by a control solenoid valve which is controlled by electronic control means (40) is disposed between a manual shift valve (50) interlocked with a transmission operation by a driver and shift valves (60, 62) driven by solenoid valves (S1, S2) controlled by the electronic control means (40). While a vehicle is advancing at a speed higher than a predetermined speed, the electronic control means (40) controls the control solenoid valve and the shift limiting valve (110) operates. Therefore, even when the driver shifts gears to reverse, a planetary gear transmission (12) is not shifted to reverse.