Gm Global Technolgoy Operations, Inc.

Delphi Technologies, Inc.

Richard W Wagner

Charles H Covert

Kenneth W Turner

Kenneth John Dauer

Thomas Charles Meiller

Carl H Sherwood

William E Gifford

Michael Raymond Raney

James F Burkhard

Karen M Meyer

Susan Scott Labine

An auxiliary canister operates with a storage canister of an evaporative emissions control system to reduce the amount of fuel vapor emitted from a vehicle to very low levels. The storage canister contains a first sorbent material and has a vent port in communication therewith. The auxiliary canister comprises an enclosure, first and second passages, a heater and a connector. Inside the enclosure, a second sorbent material is in thermal contact with the heater. Attached at one end to the bottom of the enclosure, the first passage is connectable at its other end to the vent port to allow flow between the storage and auxiliary canisters. Attached at one end to a top of the enclosure, the second passage is connectable at its other end to a vent valve of the control system to allow flow between the auxiliary canister and the vent valve. Incorporated into the enclosure, the connector is used to convey electrical power from the vehicle to the heater. During a regenerative phase of operation for the control system, the heater can be used to heat the second sorbent material and the passing purge air. This enables the second and first adsorbent materials to more readily release the fuel vapor they adsorbed during the previous storage phase of operation so that they can be burned during combustion.

Evaporative emission canister with heated adsorber

A dual tank fuel system has primary and secondary fuel tanks, with the primary tank including a filler pipe to receive fuel and a discharge line to deliver fuel to an engine, and with a balance pipe interconnecting the primary tank and the secondary tank. The balance pipe opens close to the bottom of each tank to direct fuel from the primary tank to the secondary tank as the primary tank is filled, and to direct fuel from the secondary tank to the primary tank as fuel is discharged from the primary tank through the discharge line. A vent line has branches connected to each tank to direct fuel vapor from the tanks as the tanks are filled, and to admit air to the tanks as fuel is delivered to the engine.

Dual tank fuel system

A refueling vapor recovery system for a vehicle utilizes recirculation of a portion of the displaced vapor and combines a vapor vent valve and a recirculation control into a single differential pressure valve assembly. A vapor vent conduit provides fuel tank vapor pressure to one side of a diaphragm and, through a restricted orifice, to the other side of the diaphragm, the other side being further connected by a recirculation conduit to the tank filler neck. When a gas cap closes the filler neck from the atmosphere, the orifice allows pressure to equalize across the diaphragm; and a spring biases the diaphragm to close a vapor vent valve. When the gas cap is removed, atmospheric pressure is provided through the recirculation conduit to the other side of the diaphragm, which can then be activated by a relatively small differential pressure to open the vent for relatively unrestricted vapor flow from the tank to a canister during refueling, with a small portion of the vapor recirculated in a controlled flow through the orifice and recirculation conduit to the filler neck for entrainment in incoming liquid fuel.

Fuel fill vapor recovery system with differential pressure control valve

A fuel system for an internal combustion engine is disclosed having a fuel distributor to which one or more injectors are operably connected for injecting fuel into the intake manifold of the engine. A valve assembly in the system has a valve which is disposed for movement between a first position in which fuel is recirculated through the distributor for return to the fuel supply, and a second position in which fuel supplied to the distributor is not recirculated to the supply thereby eliminating returned fuel as a heat source for said fuel supply when the valve is in the second position.

Fuel system

A tank vapor vent valve assembly mounted to the top of the tank wall has a piston actuated by a source of engine vacuum which maintains a fill vapor exit closed until the gas cap is removed to relieve the vacuum and allow the piston to open.

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Albion, NY, United States of America

Richard W Wagner