Ford Global Technolgoies, LLC

Christopher Kragh

Russell Randall Pearce

Scott Alan Bohr

Patrick Sullivan

Timothy DeBastos

Michael Igor Kluzner

William Euliss

Robert Roy Jentz

James Michael Kerns

Aed M Dudar

Daniel A Gabor

John Michael Kacewicz

Russ William Ferguson

Mark W Peters

Eric A Macke

Chad Michael Olson

A method and system for fuel vapor control in a hybrid vehicle (HEV). The HEV fuel vapor recovery system includes a fuel tank isolation valve, which is normally closed to isolate storage of refueling from storage of diurnal vapors. The method for fuel vapor control includes selectively actuating the fuel tank isolation valve during interrelated routines for refueling, fuel vapor purging, and emission system leak detection diagnostics to improve regulation of pressure and vacuum the HEV fuel vapor recovery system.

Method and system for fuel vapor control

A method for operating a fuel vapor control system included in a vehicle having an internal combustion engine is provided. The method may include storing positive pressure or negative pressure in an isolated fuel tank, transferring at least a portion of the positive pressure or the negative pressure to an evaporation canister region, and determining degradation of the evaporation canister based on a pressure response of the evaporation canister region while the evaporation canister region is isolated from the fuel tank. In this way, it is possible to utilize pressure that may be passively generated in one portion of the system, even during shut-down engine operation, to verify the integrity of another portion of the system.

Diagnostic strategy for a fuel vapor control system

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Commerce Township, MI, United States of America

Christopher Kragh