A system and method for controlling a compressor recirculation valve
involves establishing a compressor surge flow threshold expressed in
terms of a compressor corrected volume air flow rate. A torque-based
engine management system computes a desired mass air flow rate in
accordance with a torque request and other operating/predetermined data.
The desired mass air flow rate is converted into a desired, corrected
volume air flow rate, which is then compared to the compressor surge flow
threshold. The controller is configured to open the valve when the
desired corrected volume air flow rate is less than the compressor surge
flow threshold. A hysteresis function is implemented by providing a surge
flow hysteresis threshold that is offset from and greater than the
initial compressor surge flow threshold. The controller is configured to
close the recirculation valve when the desired corrected volume air flow
rate becomes greater than the surge flow hysteresis threshold.