Patent ID: 6695589
Filing Date: 2004-02-24
Classification: F16H

Abstract:
An electro-hydraulic system of an automotive transmission comprising:a variable speed motor; a controller operable to control the speed of said motor; a pump driven by said motor and having an output pressure to a main passage; a regulator valve in downstream flow relation with said pump for controlling said output pressure of said pump in said main passage, said regulator valve having a spring and a control passage on one side and a signal passage and said main passage on an opposing side wherein pressure in said control passage is determined by said controller to urge said regulator valve to a higher pressure position, and pressure in said signal passage is determined by said controller to urge said valve to a lower pressure position; and a first pressure activated switch in downstream flow relation with said regulator valve and being operable to provide an electric signal to said controller to increase the speed of said variable speed motor when said output pressure is below a lower pressure limit.