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US 12,123,376 B2Granted
Method and system for diagnosing an evaporative emissions system
AssigneeFord Global Technologies, LLC
InventorAed Dudar
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Abstract
Methods and systems for diagnosing operation of an evaporative emissions system are described. The methods and systems may include increasing an amount of vacuum stored in an evaporative emissions system during discontinuously operating an engine in a boosted operating mode. Storing vacuum allows the evaporative emissions system to reach a desired vacuum level to verify absence of an evaporative emissions system breech.
Claims8
A vehicle system, comprising:
- an engine including a compressor;
- an evaporative emissions system including an ejector;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to increase an amount of vacuum in the evaporative emissions system during a first boosted operation, close a valve to maintain evaporative emissions system pressure during a first non-boosted operation, and increase the amount of vacuum in the evaporative emissions system during a second boosted operation subsequent to the first non-boosted operation, where the first boosted operation increases the amount of vacuum to a first amount and the second boosted operation increases the amount of vacuum from the first amount to a second amount.
1 more element
Dependencies are inferred from the claim text.