Patent ID: 8078327

Claim:
An energy-saving or speed-increase control method for a hydraulic machine including a controller and a plurality of individual elements including one or more motor, oil pump, and frequency converter containing specific characteristics thereof, characterized by the following steps: I) said specific characteristics of said individual elements are pre-stored in said controller of said hydraulic machine, including restrictions on rotation speeds of said motor and said oil pump, maximum power of said motor in rotation, and output pressure of said frequency converter with a maximum current; II) a control plan to adjust pressure or flow amount of said hydraulic machine for energy-saving or production efficiency increase; III) inputting working conditions to said hydraulic machine; IV) inspection of said working conditions and operational processes of said hydraulic machine; V) updating demands in said control plan during operation of said hydraulic machine based on V.1) said working conditions inspected and V.2) said operational processes of said hydraulic machine, further restricted by V.3) said specific characteristics of said individual elements pre-stored in said controller.