Patent ID: 8747293

Claim:
A control system for controlling a rotational pump capable of running at a rotational speed comprising: a measuring system coupled to the pump for direct or indirect measurement of pressure difference or flow rate across the pump; the measuring system having an output of the measured pressure difference or flow rate, a filter system having an input coupled to the measuring system output, the filter system being designed to calculate an index of pulsatility of the pressure difference or flow rate and having an output of the index of pulsatility, an estimator having a first input coupled to the pump receiving the rotational speed of the pump and a second input coupled to the filter system receiving the index of pulsatility, the estimator estimating the gradient of the index of pulsatility with respect to the rotational speed, the estimator having an output, and a pump speed regulator coupled to the estimator output and to an input of the pump for regulating the gradient of the index of pulsatility to a pre-defined set-point above a minimum when the pump is in a partial assist mode and regulating the pump in a way that the gradient of the index of pulsatility is at the minimum when in a full assist mode.