Patent ID: 6019700
Filing Date: 2000-02-01
Classification: F16H,Y10T

Abstract:
A hydraulic control system for an automatic transmission, comprising:a signal pressure output device which outputs a first signal pressure,an amplification factor changing device, comprising a gain control valve which outputs a gain pressure regulated based on the first signal pressure and a selecting device which selects second signal pressure from the first signal pressure and the gain pressure based on their strength, to which is input the first signal pressure from the signal pressure output device and which outputs the second signal pressure selected by the selecting device based on the first signal pressure; anda regulating device to which is input the second signal pressure from the amplification factor changing device and which regulates an output pressure based on the second signal pressure wherein the amplification factor changing device changes an amplification factor, which is a change rate of the output pressure with respect to the change of the first signal pressure, to a low amplification factor and a high amplification factor within a change range of the first signal pressure.