A self-standing bag with foldable flanges includes a main body, available with two corresponding side walls and a top connected at the top of two side walls. The prosthesis comprises a female mating member comprising a main body portion, a funnel-shaped end, and a sealing segment connecting the main body portion to the funnel-shaped end; and a male mating member adapted for in vivo assembly with the sealing segment of the female mating member. A control computer is configured to continually accumulate at least one EGR fraction error sum as a function of the EGR fraction and a desired EGR fraction, and to diagnose EGR flow rate operation as a function of the accumulated value of the at least one EGR fraction error sum. An interference whitening is performed.