Charge air cooler condensate purging cycle

摘要

Methods and systems are provided for purging condensate from a charge air cooler to an engine intake. During an engine deceleration event, the vehicle is downshifted into a lower gear to increase RPM and airflow through a charge air cooler to purge stored condensate to the engine intake. By delivering condensate while an engine is not fueled, misfire events resulting from ingestion of water are reduced.

主权项

1. A method for a boosted engine, comprising:
during a deceleration event while engine cylinder fuel injection is deactivated, while the engine is spinning, and while cylinder valves are still active, selectively downshifting a transmission from a first, higher gear to a second, lower gear to increase engine speed and increase engine airflow in response to a condensate level in a charge air cooler.