HYDRAULIC SYSTEM IN AN ELECTRO-HYDRAULIC CONTROL FOR AN AUTOMATIC TRANSMISSION FOR AN AUTOMOTIVE VEHICLE

摘要

A hydraulic system includes a solenoid operated means (24) generating a first hydraulic fluid pressure which is connected to a pressure modifier valve means (22) for generating a second hydraulic fluid pressure such that the second hydraulic fluid pressure is variable in response to said first hydraulic pressure. A pressure regulator valve means (20) generates a line pressure variable in response to said second hydraulic fluid pressure. Thus, the variation characteristic of the line pressure may be easily modified to comply with the output characteristics of different engines without any modifications of the solenoid operated means.