Pump system comprising a hydraulic pump, particularly for a steering system

Abstract

A pump system with a hydraulic pump has a control element, which affects the pump output and to which control signals of a regulating and control unit can be supplied for adjustments. Input signals, which represent the state variables and operational variables of a consumer and/or of a dynamic system, in which the consumer is integrated, are supplied to the regulating and control unit. The control signals can be generated in accordance with a functional relationship, which is stored in the regulating and control unit, as a function of the input signals and supplied to the control element.

1 . Pump system with a hydraulic pump, especially for a steering system for steering the wheels of a motor vehicle, with a control element ( 13 ) which affects the output of the pump and to which control signals (S Stell ) of a regulating and control unit ( 18 ) can be supplied for adjustments, characterized in that input signals (S Ein ), which represent state variables and operational variables of a consumer ( 5 ) and/or of a dynamic system, in which the consumer ( 5 ) is integrated, can be supplied to the regulating and control unit ( 18 ), and in that the control signals (S Stell ) can be generated in accordance with a functional relationship, which is stored in the regulating and control unit, as a function of the input signals (S Ein ) and supplied to the control element ( 13 ).  
     
     
         2 . The pump system of clam  1 , characterized in that the control element ( 13 ) is an electric motor ( 14 ).  
     
     
         3 . The pump system of claims  1  or  2 , characterized in that the control element ( 13 ) is an electric lifting magnet.  
     
     
         4 . The pump system of one of the  claims 1  to  3 , characterized in that an adjustable orifice is provided in a fluid pipeline from the pump ( 1 ) to the consumer ( 5 ) and can be adjusted by control signals (S Stell ) of the regulating and control unit ( 18 ).  
     
     
         5 . The pumps system of clam  4 , characterized in that the pressure gradient ever the office can be used to adjust the pump ( 1 ).  
     
     
         6 . Pump system for a steering system of one of the  claims 1  to  5 , characterized in that the speed (v) of the vehicle, the steering angle speed and/or the yawing rate or other vehicle system signals can be used as state variables and operational variables and supplied to the regulating and control unit ( 18 ) as input signals (S Ein ).  
     
     
         7 . The pump system of one of the  claims 1  to  6 , characterized in that a closed control circuit is provided for adjusting an electric current, acting on the control element ( 13 ), the control circuit comprising a sensor ( 24 ) for measuring an actual quantity, which correlates with the pumping rate and/or the pumping pressure, and a controller ( 32 ) for comparing an actual quantity with a value for the electric current derived therefrom.  
     
     
         8 . The pump system of one of the  claims 1  to  7 , characterized in that a vane-type pump or a roller vane pump or a radial piston pump is used as pump, which is constructed as an adjusting pump and has a rotor ( 8 ), which is rotatably mounted within a curve ring ( 9 ) and a driven by a motor, with radial boreholes ( 10 ), in which there are radially displaceable pump elements, which can be supported opposite the inside of the curve ring, which pump elements act upon a fluid-accommodation space, the position of the curve ring ( 9 ) relative to the rotor ( 8 ) being adjustable by the control element ( 13 ) between a concentric position and an eccentric position.  
     
     
         9 . The pump system of  claim 8 , characterized in that the curve ring ( 9 ) can be adjusted relative to the rotor ( 8 ).  
     
     
         10 . The pump system of claims  8  or  9 , characterized in that the control element ( 13 ) drives an eccentric disk ( 20 ), the movement of which can be transferred to the curve ring of ( 9 ).  
     
     
         11 . The pump system of  claim 10 , characterized in that a translationally movable transfer lever ( 16 ) is provided between the eccentric disk ( 20 ) and the curve ring ( 9 ).  
     
     
         12 . The pump system of  claim 10 , characterized in that the eccentric disk ( 20 ) engages the curve ring ( 9 ) directly.  
     
     
         13 . The pump system of one of the  claims 8  to  12 , characterized in that the curve ring ( 9 ) is mounted so that it can rotate about a pivot point ( 12 ) and engages the control element ( 13 ) at the curve ring ( 9 ) at a distance from the pivot point ( 12 ).  
     
     
         14 . The pump system of one of the  claims 8  to  13 , characterized in that a position sensor ( 24 ) is provided for determining the position of the curve ring ( 9 ) or a quantity correlating therewith and in that the electric current, acting upon the control element ( 13 ), can be adjusted as a function of the measurement signals of the position sensor ( 24 ).  
     
     
         15 . The pump system of  claim 14 , characterized in that the position sensor ( 24 ) is constructed to be magnetoresistive, the actual position of the rotor ( 19 ) or of the component, acted upon by the latter, being determined by measuring the magnetic field of a permanent magnet ( 25 ), which is disposed at the control element ( 13 ) or at a component acted upon by the latter.  
     
     
         16 . The pump system of one of the  claims 1  to  15 , characterized in that a reduction gear ( 28 ) is provided between the control element ( 13 ) and the adjustable curve ring ( 9 ).