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US 9,284,880 B2Granted
Charge air cooler condensate purging cycle
AssigneeFord Global Technologies, LLC
InventorChris Paul Glugla
Life of this patent
Estimating the term…
Abstract
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.
Claims20
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 an automatic transmission having a clutch 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.
A vehicle engine method, comprising:
- in response to a condensate level in a charge air cooler and during conditions when engine direct injection fueling is selectively deactivated and a transmission gear is above a threshold gear, downshifting the transmission gear to increase engine speed and opening a throttle to increase airflow through a charge air cooler.
An engine method, comprising:
- during a first condition when an automatic transmission having a clutch is in a first transmission gear that is higher than a threshold gear, delivering condensate from a charge air cooler to an engine intake manifold by downshifting a transmission gear to a second transmission gear that is lower than the first transmission gear and opening an air intake throttle;
- and
- during a second condition when the transmission in a third transmission gear that is lower than the threshold gear, delivering condensate from the charge air cooler to the engine intake manifold by maintaining the transmission gear while opening the air intake throttle.
Dependencies are inferred from the claim text.