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AssigneeB&R Industrial Automation GmbH
InventorsKurt ZEHETLEITNER, Lukas WICK, Leopold GRIESSLER
Estimating the term…
In order to carry out largely automated parameterisation of the closed-loop control parameters for closed-loop control of a hydraulic system comprising a servo drive, a method and a device for determining the closed-loop parameters of a closed-loop control unit of the hydraulic system are specified, wherein an actual system pressure of a hydraulic consumer of the hydraulic system is closed-loop controlled by means of a predefined set point rotational speed of a servo drive, wherein an actual rotational speed of the servo drive follows the predefined set point rotational speed, wherein an excitation signal is applied to the setpoint rotational speed, and the actual system pressure which is set here is measured, the dynamics of the hydraulic system are acquired from the actual rotational speed and/or the setpoint rotational speed and the actual system pressure, and the closed-loop control parameters are calculated from the acquired dynamics.
A method for determining control parameters (KP, Tt, TD, TF) of a control unit (6) of a hydraulic system (1), characterized in that an actual system pressure (p_ist) of a hydraulic load (8) of the hydraulic system (1) being controlled by a predetermined target speed (n_soll) of a servo drive (3) comprising a motor (31) and a pump (32), wherein an actual speed (n_ist) of the servo drive (3) follows the predetermined target speed (n_soll), wherein an excitation signal (n1) is applied to the target speed (n_soll) and the resulting actual system pressure (p_ist) is measured, in that the dynamics of the hydraulic system (1) is determined from the actual speed (n_ist) and/or the target speed (n_soll) and the actual system pressure (p_ist), and in that the control parameters (KP, Tt, TD, TF) are calculated from the determined dynamics.
The method according to claim 3, characterized in that the actual system pressure (p_ist) represents a pressure of a hydraulic cylinder or a hydraulic motor.
The method according to 10, characterized in that a user carries out the verification of the control behavior of the control unit (4).
A hydraulic system (1) comprising a servo drive (3) with a motor (31) and a pump (32), wherein the servo drive (3) has a target speed (n_soll) predetermined by a control unit (5), wherein an actual speed (n_ist) of the servo drive (3) follows the predetermined target speed (n_soll), and comprising a hydraulic load (8) which has an actual system pressure (p_ist) which is controlled by the predetermined target speed (n_soll), wherein a control unit (4) is provided which is configured to apply an excitation signal (n1) to the target speed (n_soll) and to measure the resulting actual system pressure (p_ist) of the hydraulic system (1), to determine the dynamics of the hydraulic system (1) from the actual speed (n) and/or the target speed (n_soll) and the actual system pressure (p_ist), and to calculate the control parameters (KP, Tt, TD, TF) of the control unit (4) from the determined dynamics.
Dependencies are inferred from the claim text.