METHODS AND SYSTEMS FOR SURGE CONTROL

摘要

Methods and systems are provided for recirculating compressed air across a compressor through a high flow and a low flow compressor recirculation path. Flow through the recirculation paths is controlled via respective valves and valve opening is adjusted based on a throttle mass flow so as to maintain a compressor flow rate at or above a surge constrained flow rate. By maintaining a sufficiently high compressor flow rate during steady state and transient conditions, the compressor state can be maintained outside a surge region.

主权项

1. A method for a boosted engine, comprising:
adjusting flow through each of a first higher flow compressor recirculation path and a second lower flow compressor recirculation path based on a throttle mass flow to maintain a compressor flow rate at or above a threshold flow rate, the second recirculation passage positioned in parallel to the first recirculation passage.