US 11,970,989 B2
Method and system for improving evaporative emissions of a vehicle
Aed Dudar, Canton, MI (US); Dennis Yang, Canton, MI (US); Jonathan Bauer, Belleville, MI (US); and Kenneth Pifher, Taylor, MI (US)
Assigned to Ford Global Technologies, LLC, Dearborn, MI (US)
Filed by Ford Global Technologies, LLC, Dearborn, MI (US)
Filed on Jul. 11, 2022, as Appl. No. 17/811,815.
Prior Publication US 2024/0011448 A1, Jan. 11, 2024
Int. Cl. F02D 41/00 (2006.01); B01D 53/04 (2006.01); F02D 41/38 (2006.01); F02M 25/08 (2006.01)
CPC F02D 41/0045 (2013.01) [B01D 53/0415 (2013.01); F02D 41/0042 (2013.01); F02D 41/38 (2013.01); F02M 25/0836 (2013.01); F02M 25/0854 (2013.01); B01D 2253/102 (2013.01); B01D 2257/702 (2013.01); B01D 2259/4516 (2013.01); B01D 2259/4566 (2013.01); F02D 2200/0602 (2013.01)] 9 Claims
OG exemplary drawing
 
1. 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.