LEAK ESTIMATION IN A GAS DELIVERY SYSTEM USING BLOCK LEAST-MEAN-SQUARES TECHNIQUE

摘要

A method of estimating leak flow in a gas delivery system is provided that includes determining an average total flow Q_tot (or summation or integral of total flow) of the gas delivery system for each of N breaths, determining P^γ1and P^γ2for each of the N breaths, wherein P is a leak pressure of the gas delivery system, γ1 is a first predetermined value, γ2 is a second predetermined value, and P^γ1 and P^γ2are averages for the breath (summation or integrals may also be used),setting up a system of N equations, one for ea h of the N breaths, wherein each of the equations has the form Q_tot = G_orf.P^γ1+G_vg.P^γ2and uses the determined Q_tot, P^γ1and P^γ2 for the associated breath, solving the system of N equations for G_orfand G_vg, and using G_orfand G_vg to calculate instantaneous leak Q_leak using Q_leak= G_orf.P^γ1+G_vg.P^γ2