Drive system comprising an adjustable hydrostatic machine
AssigneeMannesmann Rexroth GmbH
InventorTheo Hein
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Abstract
For a drive system comprising a hydrostatic adjustable machine an electrical control is provided with which the actuator of the machine is driven so that for acceleration, retardation and braking, i.e. when the machine moves from motor mode to pump mode, a predetermined operating behavior of the machine necessarily results. The particular input desired value for the speed is transformed so that suddenly occurring abrupt acceleration, retardation and braking operations are avoided and in particular on abrupt entry of desired values increased safety against operating errors is achieved.
Claims12
Drive system comprising an adjustable hydrostatic machine which is connected to a pressure line and operating as motor or pump takes fluid from the pressure line or supplies fluid to said pressure line, having a directional valve for actuating the adjusting member of the hydrostatic machine for setting a rotational speed, comprising a rotational speed controller to which the speed actual value is supplied by a tachogenerator coupled to the machine and an arbitrarily settable speed desired value is supplied and which generates a control signal for driving the directional valve, characterized in that the desired value input of the speed controller (26) is preceded by a selection stage (40) to which the speed desired value and a guide signal derived from the speed actual value and lying beneath the speed actual value are supplied and that the selection stage switches the particular greater signal through to the desired value input of the speed controller.
Dependencies are inferred from the claim text.