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US 2014/0128221 A1Published application
Method and system to control vehicle operation
AssigneeFord Global Technologies, LLC
InventorsChris Paul Glugla, Shuya Shark Yamada
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for performing a multiple gear downshift of a transmission gear by transiently operating in an intermediate gear. In response to ambient humidity and a condensate level in a charge air cooler, the transmission gear may be downshifted from a higher gear to an intermediate gear, and then to a requested lower gear. Downshifting through an intermediate gear may also be controlled based on the gear shift request.
Claims23
A method for an engine, comprising:
- in response to an ambient condition and a request to downshift a transmission gear from a higher gear to a lower gear, transiently operating at an intermediate gear before shifting to the lower gear.
A method for an engine, comprising:
- in response to a condensate level in a charge air cooler and a request to downshift a transmission gear from a higher gear to a lower gear, transiently operating at an intermediate gear before shifting to the lower gear.
A method for an engine, comprising:
- in response to a multiple gear downshift request, responsive to an ambient condition and a condensate level in a charge air cooler being greater than a first threshold level, downshifting a transmission from a higher gear to an intermediate gear, and then to a requested lower gear.
A method for an engine, comprising:
- during a first condition, when a condensate level in a charge air cooler is greater than a first threshold level, shifting from a higher gear to a requested lower gear by transiently operating at an intermediate gear before shifting to the requested lower gear;
- during a second condition, when a condensate level in a charge air cooler is less than a first threshold level, shifting from a higher gear to a lower gear when requested, without operating in the intermediate gear.
Dependencies are inferred from the claim text.