the above obtained trend line v i characteristics using the table loop up technique according to the present invention by way of example fig4 shows a diagram of a control block for a pump system 50 having a simple yet effective approaches according to some embodiments of the present invention as shown the control block or module 40 includes devices components or modules such as the pi d controller module 41 along with other components or modules 42 44 46 48 for controlling the operation of the pump 30 the module 42 senses current from the motor along signal path 42 a and provides a current sensing signal along signal path 42 b containing information about the sensed motor current the module 44 is configured to respond to the current sensing signal along signal path 42 b to measure current at a motor voltage and provide a measured current signal along signal path 44 a containing information about the measured current at that motor voltage the one or more input signals containing information about current provided from the pump 30 fig4 includes the current sensing signal along signal path 42 b the module 46 is configured to respond to a voltage output signal e along signal path 41 a provided from the pi d controller module 41 to the pump 30 along signal path 41 a for controlling the operation of the pump 30 to set current at a particular voltage calibration and provide a signal along signal path 46 a containing information about the set current at the particular voltage calibration the node module 48 is configured to response.