Venturi for vapor purge
AssigneeFord Global Technologies, LLC
InventorThomas G. Leone
Life of this patent
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Abstract
Systems and methods for an engine comprising a venturi coupled in an intake of the engine are provided. In one example approach, a method of controlling operation of an engine having a fuel vapor purging system comprises: directing intake air through a first throttle and a venturi disposed in a bypass conduit coupled around an intake of the engine upstream and downstream of a second throttle disposed in the intake; and in response to an operating condition, delivering fuel vapor flow from the fuel vapor purging system to an inlet of the venturi.
Claims18
A method of controlling operation of an engine having a fuel vapor purging system, comprising:
- directing intake air through a first throttle and a venturi disposed in a bypass conduit coupled in parallel around a second throttle disposed in the intake;
- in response to an operating condition, delivering fuel vapor flow from the fuel vapor purging system to an inlet of the venturi;
- and
- adjusting an amount of fuel vapor flow delivered to the inlet of the venturi via a fuel vapor purging valve coupled to the fuel vapor purging system based on an air flow rate through the venturi and an air temperature and pressure.
A method of controlling operation of an engine having a fuel vapor purging system, comprising:
- directing intake air through a first throttle and a venturi disposed in a bypass conduit coupled in parallel around a second throttle disposed in the intake;
- in response to an engine load less than a threshold, adjusting the first throttle to attain a desired torque while keeping the second throttle substantially closed and in response to the engine load greater than the threshold when the second throttle is not in a wide open throttle state, adjusting the second throttle to attain the desired torque while keeping the first throttle fixed in a partially open state;
- and
- in response to a fuel vapor purging condition, delivering fuel vapor flow from the fuel vapor purging system to an inlet of the venturi.
An engine system comprising:
- a first throttle and a venturi disposed in a bypass conduit coupled in parallel around a second throttle disposed in an intake;
- a fuel vapor purge system coupled to a venturi inlet;
- and
- a controller with instructions executable to adjust the first throttle in response to a first operating condition;
- and to adjust the second throttle in response to a second operating condition while fixing the first throttle's position.
Dependencies are inferred from the claim text.