Back to results
US 11,970,989 B2Granted
Method and system for improving evaporative emissions of a vehicle
AssigneeFord Global Technologies, LLC
InventorsAed Dudar, Dennis Yang, Jonathan Bauer, Kenneth Pifher
Life of this patent
Estimating the term…
Abstract
Methods and systems are presented for improving operation of an evaporative emissions system. In one example, the methods and systems estimate a fuel vapor concentration based on output of a fuel tank level sensor and output of a fuel pressure sensor. A canister purge valve is adjusted to an initial position at a beginning of a fuel vapor purging cycle to reduce a fuel vapor purging time.
Claims9
A method for operating an evaporative emissions system, comprising:
- operating with fuel vapors from a carbon filled fuel vapor storage canister not flowing to an engine;
- estimating a concentration of fuel vapors stored in the carbon filled fuel vapor storage canister via a controller based on conditions when fuel vapors from the carbon filled fuel vapor storage canister do not flow to the engine, where the estimating the concentration of fuel vapors is based on fuel vapor concentration estimates from a plurality of events where pressure is reduced in a fuel tank or a plurality of events where fuel is added to a fuel tank;
- and
- adjusting operation of the engine via the controller according to the concentration of fuel vapors.
1 more element
A method for operating an evaporative emissions system, comprising:
- estimating a concentration of fuel vapors stored in a carbon filled fuel vapor storage canister via a controller based on conditions when fuel vapors from the carbon filled fuel vapor storage canister do not flow to an engine, where the estimating the concentration of fuel vapors includes summing fuel vapor concentration estimates from a plurality of events where pressure is relieved from a fuel tank;
- and
- adjusting operation of the engine via the controller according to the concentration of fuel vapors.
Dependencies are inferred from the claim text.