Methods and system for compensating compressor recirculation sludge

摘要

Systems and methods for compensating for deposits that may accumulate within a compressor recirculation valve positioned in parallel with a turbocharger compressor are presented. The systems and methods adjust actuators to maintain engine operation such that it may be more difficult for a driver to become aware that a compressor recirculation valve diagnostic is being executed.

主权项

1. A diagnostic method, comprising:
partially opening a waste gate and adjusting a compressor recirculation valve to a closed position in response to a diagnostic request; incrementally opening the compressor recirculation valve after the compressor recirculation valve is closed; adjusting a compressor recirculation valve airflow offset in response to a control parameter while incrementally opening the compressor recirculation valve from the closed position; and operating the compressor recirculation valve in response to the airflow offset.