SYSTEM FOR CONTROLLING A RESONANT LINEAR COMPRESSOR PISTON, METHOD FOR CONTROLLING A RESONANT LINEAR COMPRESSOR PISTON, AND RESONANT LINEAR COMPRESSOR

摘要

A control method and a system for controlling the piston of a resonant linear compressor including at least one electronic control unit, the electronic control unit including at least one observing electronic circuit and at least one control circuit associated to each other. The observing electronic circuit is configured for: measuring at least one electric magnitude of the electric motor; estimating at least one set of electric parameters and at least one set of mechanical parameters of the resonant linear compressor; and estimating and providing at least one control parameter of the system for the control circuit based on the measured electric magnitude measured and on the estimated set of electric and mechanical parameters. The control circuit is configured for actuating the electric motor from the at least one control parameter.

主权项

1. A control method for the piston of a resonant linear compressor, the resonant linear compressor (100) comprising at least one electric motor, the electric motor being actuated by a frequency inverter, the control method comprising the following steps:
a) measuring each operation cycle (TR) of the resonant linear compressor (100), with a discretization frequency (Fd), a measured current (im) of the electric motor; b) calculating an operation cycle (TR) of the resonant linear compressor (100) from the measured current (im) of the electric motor, and on the basis of the calculated operation cycle (TR), calculating a resonance frequency (FR) of the resonant linear compressor (100); c) calculating at each operation cycle (TR) of the resonant linear compressor (100), at the discretization frequency (Fd), a calculated current of the motor (ie(t)), a piston displacement (de(t)) and a piston velocity (Ve(t)); d) calculating at each operation cycle (TR) of the resonant linear compressor (100), at the discretization frequency (Fd), a current error of the observer (ieo) calculated by the difference between the measured current (im) and the calculated current of the motor (ie(t)); e) calculating, on the basis of the piston displacement (de(t)) calculated in step c), a maximum displacement (DMAX) of the piston (1) of the resonance linear compressor (100); f) calculating, in one operation cycle (TR), a real input power (Pe) on the electric motor from the measured current (im) and from an operation voltage (uc) applied by the inverter of the electric motor; g) calculating, in one operation cycle (TR), a dissipated power (PR) at an electric resistance of the motor (R) from the measured current (im); h) calculating a total dampening force (FAMT), produced in one operation cycle (TR), from a total dampening coefficient (KAMT) and from the piston velocity (Ve(t)) calculated in step c); i) calculating a power dissipated by the total dampening (PAMT) from the total dampening force (FAMT) calculated in the preceding step and from the piston velocity (Ve(t)) calculated in step c); j) calculating an equivalent continuous force (FCont) as a function of the real input power (Pe) on the electric motor calculated in step f) and as a function of the operation cycle (TR) calculated in step b); k) calculating, from the maximal displacement (DMAX) and from the piston velocity (Ve(t)), and the measured current (im), a value of operation voltage (uc) to be applied to the electric motor of the linear compressor (100); and l) applying to the electric motor of the resonant linear compressor (100) the value of operation voltage (uc) calculated in step k).