Device for controlling a hydraulic actuator
AssigneeBosch Rexroth AG
InventorAlbert Kockemann
Life of this patent
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Abstract
To control the flow of pressure medium to and from a hydraulic actuator, a device is provided which comprises an electrically operated valve and a controller, integrated into the housing of the valve or held on the latter in its own housing, for the position of the valve piston. In order to make it possible to use such devices cost-effectively in open-loop and closed-loop control systems with a plurality of electrohydraulic drives, a controller for a variable representative of the movement of the actuator, and an electronic controller for the movement sequence of the actuator, are arranged in the same housing as the controller for the position of the valve piston. Devices of this type are used everywhere where electrohydraulic drives are controlled, e.g. in the machine tool sector.
Claims10
A device for controlling a hydraulic actuator, comprising an electrically operated valve which controls the flow of pressure medium to and from the actuator, and comprising a controller, integrated into the housing of the valve or held on the latter in its own housing, for the position of the valve piston, characterized by the fact that a controller (16) for a variable (s) representative of the movement of the actuator (13), and an electronic controller (27) for the movement sequence of the actuator (13), are arranged in the same housing (12) as the controller (15) for the position (x) of the valve piston.
The device as claimed in one of the preceding claims, characterized by the fact that the electronic controller (27) has an interface (32) to a global bus system (33), via which the device (10) can be connected to a higher-order controller (34).
The device as claimed in one of the preceding claims, characterized by the fact that the valve (11) is provided with two pressure sensors (24, 26) which register the pressures (pA, pB) in the area of the output connections (A, B) of the valve (11), by the fact that the output signals (pA, pB) from the pressure sensors (24, 26) are supplied to a computing circuit (25), which links the signals (pA, PB) supplied to it to form an actual pressure value (pi) for the pressure control, and by the fact that the computing circuit (25) is arranged in the same housing (12) as the controller (15) for the position (x) of the valve piston.
The device as claimed in one of the preceding claims, characterized by the fact that the controller (16) for the variable (s) representative of the movement of the actuator (13) is constructed as a microprocessor-controlled digital controller.
Dependencies are inferred from the claim text.