Surge avoidance control method and surge avoidance control device for exhaust turbine turbocharger

摘要

A surge avoidance control method that includes a surge detection step of determining whether the operation point of the compressor is positioned in a surge operation region at each predetermined timing; a surge avoidance opening-degree calculation step calculating a surge avoidance opening degree of the operation device necessary for moving the operation point of the compressor determined to be positioned in the surge operation region in the surge detection step out of the surge operation region; a correction opening-degree calculation step calculating a correction opening degree of the operation device on the basis of a moving velocity of the operation point of the compressor which is determined to be positioned in the surge operation region in the surge detection step; and an opening-degree command value calculation step calculating an opening-degree command value of the operation device on the basis of the surge avoidance opening degree and the correction opening degree.