System comprising a pump, an injector and a regulator, with control signals to the pump which are based on calculated hose rigidities

摘要

A pump system that includes a pump, an injector and a regulator with a calculation unit. The regulator controls the pump to pump a liquid through a hose to the injector which opens and closes in response to an injector control signal, the time for an opening and closing cycle being called injector cycle and designated Ts, and the injector's open period being designated γ. The injector has a pressure sensor to measure the pressure of the liquid in the injector and to deliver to the calculation unit a pressure sensor signal representing the pressure amplitude in the injector. The calculation unit calculates the hose's rigidity B as a function of measured pressured amplitudes A in the injector, the injector cycle Ts and the injector's open period γ, and the regulator determines the basis of B the control signal to the pump.

主权项

1. A method of controlling a pump system, comprising:
based on a control signal sent to a pump, causing the pump to pump a liquid through a hose to an injector which is configured to open and close with an open period designated γ and a time for a whole opening and closing cycle which is designated TS; measuring the pressure of the liquid in the injector; calculating the rigidity B of the hose as a function of measured pressure amplitudes A in the injector, the injector cycle TS, and the injector's open period γ, and determining on the basis of B the control signal to the pump.