Passive venturi pump for leak diagnostics and refueling

摘要

Systems and methods for operating a hybrid electric vehicle with a passive venturi pump are disclosed. In one example approach, a method comprises: during vehicle motion, passing air through a venturi coupled to the vehicle to generate vacuum; storing the generated in an accumulator; and, in response to a condition, discharging the stored vacuum to a vacuum consuming system of the vehicle.

主权项

1. A method for operating a vehicle with an engine, comprising:
during vehicle motion, passing air through a venturi coupled to the vehicle to generate vacuum; selectively storing the generated vacuum in an accumulator by controlling a valve arranged in a conduit coupling the venturi with the accumulator based on vehicle speed and an amount of accumulator vacuum; and in response to a condition, discharging the stored vacuum to a vacuum consuming system of the vehicle.