is supplied as an input to summing function 50 in fig2 b is subtracted from the sum of a value from look up table 34 and a value from p li d function 62 in fig2 a a value from look up table 36 represents the desired boost meaning desired manifold pressure that turbocharger 12 should be producing in the engine intake manifold subject to any limiting imposed by limiting function 42 a data value for processed manifold pressure 26 a representing actual boost being produced by the turbocharger unless limited by limiting function 44 is subtracted from a data value for desired boost that is called for by the processed engine speed and the processed engine load to create a data value for manifold pressure error 48 a that is subsequently processed by p li d function 62 one may therefore perceive that the value of processed manifold pressure or processed boost represents negative feedback and that the value of manifold pressure error 48 a represents an error signal input for the closed loop control of turbocharger 12 via p li d function 62 p li d function 62 represents the primary control for developing the pulse width modulated signal applied to the control solenoid of turbocharger 12 that sets vane position overspeed protection sub strategy 60 and look up table 34.