Patent ID: 7028470

Claim:
An apparatus for executing activities assisted by equipment driven by a hydraulic unit, comprising: one of a rotating and a linear hydromotor being at least one of loadable and movable in two directions; a hydraulic transformer provided with a rotor and having a continuously variable setting controlled by an adjustment means; a connecting line connecting the one of the rotating and linear hydromotor and the hydraulic transformer, the apparatus comprising: a pressure source for storing and delivering fluid of high pressure, a high-pressure line connecting the pressure source and the hydraulic transformer; a tank for receiving and supplying fluid at low pressure; a low pressure line connecting the tank and the hydraulic transformer; and a control means for controlling the one of the rotating and linear hydromotor by setting the adjustment means and thereby setting a fluid pressure in the connecting line, wherein the control means comprises a means for restricting a hydromotor load and a hydromotor speed by adjusting the adjustment means based on a feedback of the hydromotor load and the hydromotor speed using a sensor for measuring the flow rate of the fluid flow in the connecting line between the one of the rotating and linear hydromotor and the hydraulic transformer and one of a sensor for measuring the flow rate of the fluid flow in the high-pressure line to the hydraulic transformer and an algorithm for calculating the hydromotor load based on the setting of the adjustment means and a measured flow rate.