change to a change in valve opening the disparity in boost difference between actual boost and desired boost set point may be considered as a boost deficit that can be either positive or negative the invention provides immediate feed forward adjustment of the egr valve because the strategy bypasses pid controller 40 when applying u03b4x egr to the egr valve the signal egr_dty may be considered a composite signal composed of a closed loop component from the pid controller 40 and an open loop feed forward component from algorithm 50 in a motor vehicle powered by engine system 10 a sudden depression of the acceleration pedal by the driver will cause egr valve 26 if open to be promptly operated in the direction of closing quickly reducing the mass flow rate of exhaust gas through the egr valve the immediate effect is a corresponding reduction in exhaust gas being introduced into the engine cylinders because engine fueling is being quickly increased to accelerate the engine the quickly reduced amount of egr facilitates the ensuing in cylinder combustion processes and turbocharger operation toward more quickly nulling out the boost discrepancy as the engine accelerates a sudden deceleration like that resulting from release of the accelerator will quickly drop the desired boost set point the inventive strategy causes egr valve 26 to be promptly operated in its opening direction to quickly increase the mass flow rate of exhaust gas through the egr valve so that more exhaust gas is introduced into the engine cylinders the quickly increased amount of egr can limit no x formation during the deceleration a comparison of the traces shown in fig6 with those shown in fig7 are representative of the effectiveness.