SYSTEM COMPRISING PUMP, INJECTOR AND REGULATOR, WITH CONTROL SIGNALS TO THE PUMP WHICH ARE BASED ON CALCULATED HOSE RIGIDITIES

摘要

Pump system comprising a pump, an injector and a regulator with a calculation unit, which regulator is adapted to controlling said pump by a control signal to pump a liquid through a hose to said 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 T s , and the injector's open period being designated ?. The injector is provided with a pressure sensor adapted to measuring the pressure of the liquid in the injector and to delivering to the calculation unit in the regulator a pressure sensor signal which represents the pressure amplitude in the injector, the calculation unit is thus adapted to calculating the hose's rigidity B as a function of measured pressured amplitudes A in the injector, the injector cycle T s and the injector's open period ?, and the regulator is adapted to determining on the basis of B the control signal to the pump.