METHOD AND SYSTEM FOR CONTROLLING HYDRAULIC APPARATUS FOR CONTINUOUSLY VARIABLE TRANSMISSION OF HYBRID VEHICLE SYSTEM

摘要

The present invention provides a method and system for controlling hydraulic apparatus for CVT of a hybrid vehicle system, which adjust rotation speed of an input axial and output axial by means of hydraulic pressure generated from a first and a second hydraulic pump and guided through hydraulic circuits coupled to the input and output shafts for controlling gear ratio and output torque of the CVT. Meanwhile the present invention determines serial or parallel connection between the first and second hydraulic pumps according to the operation mode and status of the hybrid vehicle system so as to control the output of the CVT effectively. Besides, the present invention controls the hydraulic pressure of the first and second hydraulic pump for controlling the gear ratio of CVT such that the input source such as engine or motor can be operated in the optimized zone thereby reducing the energy consumption.