US 9,732,706 B2 · System and methods for regulating fuel vapor flow in a fuel vapor recirculation line

Abstract

Methods and systems are provided for regulating the flow of fuel vapors exiting a fuel tank. In one example, a method for an engine may include adjusting an amount of fuel vapors flowing through a fuel vapor recirculation line, where the recirculation line may be coupled on a first end to a fuel tank and on an opposite second end to a fuel fill inlet. The valve may be adjusted to a more open position to increase fuel vapor flow through the recirculation line in response to increases in hydrocarbon emissions from a fuel vapor canister, and to a more closed position to reduce fuel vapor flow through the recirculation line in response to increases in hydrocarbon emissions from the fuel fill inlet.

Claims20

Dependent claims

A system comprising:

a fuel tank;
a fuel fill inlet coupled to the fuel tank and configured to receive a fuel dispensing mechanism for supplying fuel to the fuel tank;
a recirculation line coupled on a first end to the fuel tank, and on an opposite second end to the fill inlet, the recirculation line comprising a variable orifice valve;
a fuel vapor canister;
a vent line coupled on a first end to the canister, and open on an opposite second end to ambient air;
and
a controller with computer readable instructions for:
adjusting the position of the variable orifice valve based on hydrocarbon emission levels from one or more of the fuel fill inlet and the vent line.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

14/825,067Filed 12 Aug 2015

Published

US 2017/0045019 A116 Feb 2017

Granted

15 Aug 2017

Term ends

Not estimatedThe source records don’t support an estimate.

Classification13 codes

F02M 25/0836
Adding fuel vapours drawn from engine fuel reservoir: arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve…
B60K 15/03519
Characterised by venting means: valve arrangements in the vent line
F02D 41/003
Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures:…
F02M 25/0854
Adding fuel vapours drawn from engine fuel reservoir: details of the absorption canister

System and methods for regulating fuel vapor flow in a fuel vapor recirculation line

Life of this patent

System and methods for regulating fuel vapor flow in a fuel vapor recirculation line

Life of this patent

Abstract

Claims20