Variable rate purge control for refueling vapor recovery system

Patent · Tue May 12 04:00:00 EDT 1987

OSTI ID:6514663

Hamburg, D R

A method is described of controlling purging of fuel vapors from a fuel canister storing fuel vapors from the fuel tank of an internal combustion engine. The steps include: regulating the mixture of fuel and inlet air in response to the output sensing to provide an air/fuel ratio of inlet air and purge air to fuel vapor and fuel within a predetermined range; determining when the amount of fuel vapor stored in the vapor canister is above a threshold amount; and limiting the purge flow of the mixture of purge air and fuel vapor from the canister to the engine when the fuel vapor is above the threshold amount so that the regulating step is able to prevent the air/fuel ratio from exceeding the predetermined range. The limiting comprising modulating the purge flow.

• Assignee: Ford Motor Co., Dearborn, MI
• Patent Number(s): US 4664087
• OSTI ID: 6514663
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
AIR FLOW
CONTAINERS
DISPERSIONS
ENGINES
EXHAUST GASES
FLUID FLOW
FLUIDS
FUEL-AIR RATIO
GAS FLOW
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
METERS
MIXTURES
OXYGEN METERS
STORAGE FACILITIES
TANKS
VAPORS
WASTES