Patent ID: 9037370
Filing Date: 2015-05-19
Classification: F16D,F16H

Abstract:
1. An electro-hydraulic controller for a transmission, the electro-hydraulic controller comprising a hydraulic circuit configured to receive hydraulic fluid at a fluid pressure from a fluid source, a plurality of hydraulically actuated clutches comprising an input clutch, a first mode clutch, and a second mode clutch, a mode logic section for controlling the flow path of hydraulic fluid to the hydraulically actuated clutches to control a ratio of the transmission, the mode logic section comprising a first logic valve assembly and a second logic valve assembly, the first and second logic valve assemblies (i) operable to vary the flow path of hydraulic fluid to selectively apply a first trim pressure, different from the fluid pressure, to the input clutch and (ii) operable to vary the flow path of hydraulic fluid to selectively apply a second trim pressure, different from the fluid pressure, to the first mode clutch, and a mode trim section for controlling the pressure applied to clutches, the mode trim section cooperating with the mode logic section to vary the pressure applied to each of the plurality of hydraulically actuated clutches to vary the operating mode of the transmission.